DHL series coal-fired steam boiler

Product thermal capacity: 20-75 t/h

Working pressure: 1.25-5.4 MPA

Outlet temperature: 184-485 ℃

Available fuel: Bituminous coal,biomass

Available industries: Power generation, heating, chemical, food, rubber

 

 

 

Introduction

DHL corner tube boiler is field assembled boiler, it uses a piping system as the frame of the entire boiler, and it bears the full load of the boiler, which makes a non-framework boiler. At the same time, this frame also serves as the down comer of the boiler and upper and lower headers. The boiler drum is an external type drum, the furnace is a fully enclosed membrane wall structure, the convective heat absorbing surface adopts the flag tube structure. The corner tube boiler has the advantages of compact structure, low steel consumption and rapid temperature increase.

Technical advantages

Safe water circulation

The boiler adopts a unique water circulation structure; the drum is not heated and the heated water flows in one direction. In the event of power cut, the water does not vaporize in water system and the water circulation is safe and reliable.

Anti-seismic Structure

Corner tube boiler adopts non-framework structure, its body weight is supported by membrane wall and down comer, and all membrane walls are welded into one whole piece with good anti-seismicity.

Complete sealed structure

The boiler proper is surrounded by welded membrane wall, and the steel structure is completely sealed to prevent air leakage. The upper part of the boiler can be separately transported according to the size of the railway transportation limit. The excess air coefficient at the boiler tail is less than 1.2, which not only reduces the heat loss of the exhaust smoke and power consumption of the induced draft fan, but also greatly reduces the environmental pollution of the boiler house.

 

SZL series biomass-fired steam boiler

Product thermal capacity: 4-35 t/h

Working pressure: 1.0-2.5 MPA

Outlet temperature: 184-350 ℃

Available fuel: Biomass molding granules, wood chip, corn cob, saw dust

Available industries: Heating, chemical, food, tobacco, textile, print and dyeing, feed, medicine, building materials, wine, hospital

 

Introduction

SZL series biomass-fired steam boiler is package or shop-assembled water tube boiler with double steam drum and chain grate stoker structure. 4-6 tph boiler is package boiler and 6-35 tph is shop-assembled structure, which is composed of 2 parts, upper part is heat absorbing surface and lower part is combustion equipment. The former part of boiler body is surrounded by membrane wall, its upper part connects with boiler drum and lower part connects with header, which forms a combustion chamber to absorb the radiated heat from furnace; there are dense convection tube bundle between the back side of upper and lower drum, the high temperature smoke enters a separate economizer after flushing heat absorbing surface then discharge from chimney.

Technical advantages

 

CNC manufacturing technology

The key processing technologies such as steel plate blanking, circling, drum and tube plate drilling adopt advanced CNC machining to reduce the assembly stress and prolong the service life of the boiler.Steel tube cutting, thread tube pressing and convection tube processing all adopt advanced CNC technology.

Automatic production line.

Advanced welding process

The welding of important parts like the vertical and circular seams of the boiler, the tubes, the inside of boiler and the flange are all adopted automated welding processes such as submerged arc welding or gas shielded welding to ensure the welding quality. All the vertical and circular seams will be done 100% radiographic inspection.

 

Tube flange weld adopts robot welding.

The chain grate panel, front and rear smoke chamber panel adopts CNC

plasma cutting machine to cut orderly and beautifully.

 

Unique structural design

According to different capacity, different numbers of independent air bins are arranged from front to back of the grate.

The user can reasonably adjust the air distribution according to different combustion conditions to ensure that the fuel is fully burnt.

Secondary air is input to disturb fuel gas in the furnace, to ensure the fuel is burnt totally. The independent secondary fan makes it easy to control and adjust the air volume and air pressure.

Feeds evenly feeding and avoid flashback.

 

Low NOx emissions

Graded air supply and special furnace arch structure decrease the NOx emissions to 100mg/m³.

Different biomass raw materials are analyzed by numerical simulations, thermal efficiency is more than 90%.

 

 

SZL series biomass-fired hot water boiler

Product thermal capacity: 2.8-29 MW

Working pressure: 1.0-1.25 MPA

Outlet temperature: 95/70℃, 115/70℃

 

Available fuel: Biomass molding granules, wood chip, corn cob, saw dust

Available industries: Heating, hotels, schools, hospitals

 

 

Introduction

SZL series biomass-fired hot water boiler is package or shop-assembled water pipe boiler with double steam drum and chain grate stoker structure. 4-6 tph boiler is package boiler and 6-35 tph is shop-assembled structure, which is composed of 2 parts, upper part is heat absorbing surface and lower part is combustion equipment. The former part of boiler body is surrounded by membrane wall, its upper part connects with boiler drum and lower part connects with header, which forms a combustion chamber to absorb the radiated heat from furnace; there are dense convection tube bundle between the back side of upper and lower drum, the high temperature smoke enters a separate economizer after flushing heat absorbing surface then discharge from chimney.

Technical advantages

CNC manufacturing technology

The key processing technologies such as steel plate blanking, circling, drum and tube plate drilling adopt advanced CNC machining to reduce the assembly stress and prolong the service life of the boiler.

Steel tube cutting, thread tube pressing and convection tube processing all adopt advanced CNC technology.

Automatic production line.

Advanced welding process

The welding of important parts like the vertical and circular seams of the boiler, the tubes, the inside of boiler and the flange are all adopted automated welding processes such as submerged arc welding or gas shielded welding to ensure the welding quality. All the vertical and circular seams will be done 100% radiographic inspection.

Tube flange weld adopts robot welding.

The chain grate panel, front and rear smoke chamber panel adopts CNC plasma cutting machine to cut orderly and beautifully.

Unique structural design

According to different capacity, different numbers of independent air bins are arranged from front to back of the grate.

The user can reasonably adjust the air distribution according to different combustion conditions to ensure that the fuel is fully burnt.

Secondary air is input to disturb fuel gas in the furnace, to ensure the fuel is burnt totally. The independent secondary fan makes it easy to control and adjust the air volume and air pressure.

Feeds evenly feeding and avoid flashback.

Low NOx emissions

Graded air supply and special furnace arch structure decrease the NOx emissions to 100mg/m³.

Different biomass raw materials are analyzed by numerical simulations, thermal efficiency is more than 90%.

DZL series biomass-fired steam boiler


Product thermal capacity: 2 – 20t/h

Working pressure: 1 – 2.5 MPA

Outlet temperature: 170-225 ℃

Available fuel: Biomass particles

Available industries: Heating, chemical, food, tobacco, textile, printing and dyeing, feed, medicine, building material, wine, rubber, hospital

 

 

Introduction

DZL series package boilers are horizontal three-pass water & fire tube boilers with a chain grate stoker structure. Threaded pyrotechnic tubes are arranged in the drum to form a convection heating surface, while the drum and the water walls on both sides form a radiation heating surface in the furnace. Each package system is fully installed and wired before being transported to site and is electrically controlled to provide functions such as stepless speed regulation for the stoker, threshold parameter alert and interlock protection.

Technical advantages

 

CNC manufacturing technology

 

The key processing technologies such as steel plate blanking, circling, drum and tube plate drilling adopt advanced CNC machining to reduce the assembly stress and prolong the service life of the boiler.

 

 

Steel tube cutting, thread tube pressing and convection tube processing all adopt advanced CNC technology.

 

Arched tube sheets and threaded fire tube was first adopted in China to increase heat transfer and completely solve the problem of cracking of the back tube sheet.

 

Chain grate plate and back smoke chamber plate is cut by CNC plasma cutting machine, which looks neat and beautiful.

 

Advanced welding process

 

The vertical and circumferential seam welding of the boiler adopts advanced automatic submerged arc welding technology to ensure the welding quality. All vertical and circumferential welds will go through 100% ray detection.

 

 

The welding of smoke tube and the tube plate adopts pre-expansion to eliminate the gap between the tube and tube plate, then be welded by automatic argon arc welding, which effectively eliminate stress and prolong boiler life.

 

 

The flange of the socket is welded by robots.

 

The chain grate is manufactured by our factory, and it is tested for 72 hours before leaving the factory to ensure that the tightness is moderate and won’t deviate.

 

Precision parts processing

 

Advanced manufacturing technology, using assembly line automatic spinning manufacturing.

 

Enhance heat transfer and raise boiler thermal efficiency.

 

Threaded smoke tubes are highly efficient heat transfer elements which is from many years research of our company. After continuous optimization, the heat transfer coefficient is 1.8 times higher than normal smoke tubes.

 

Unique structural design

Disturbed flue gas to ensure complete combustion of volatiles.

The air volume accounts for about 30% of the total, and the wind speed is about 50m³.

 

The independent secondary fan makes it easy to control and adjust the wind volume and pressure.

 

 

The high-temperature smoke generated by the combustion first enters the horoscope flue on both sides of the boiler proepr from the tail (in this case, the boiler is water tube type), and the flue gas flows outside the tube.

 

 

The flue gas cooled by the horoscope flue enters the threaded tube (in this case the boiler is fire tube type) arranged in the drum from the front smoke chamber.

 

 

The flue gas will be exhausted from the back smoke chamber, this design fundamentally solves the problem of cracking of the tube sheet of a simple fire tube boiler.

 

Abundant auxiliary configuration

 

Feeder: Feeding fuel equally to avoid flashback.

 

 

Gearbox: Designing reasonable rotating speed according to the combustion speed to make sure the fuel burning completely.

 

 

Cover plates: Cold-rolled pressed plates, strong and elegant.

 

 

Inspection door: reasonable manhole and hand hole layout, easy for maintenance. Inspection doors in furnaces for easy access and maintenance.

 

 

DZL series biomass-fired hot water boiler

Product thermal capacity: 1.4 – 14 MW

Working pressure: 1.0-1.6 MPA

Outlet temperature: 115/70 ℃

Available fuel: Available fuel: Biomass molding granules, wood chip, corn cob, palm shell

Available industries: Heating, hotels, schools, hospitals

 

 

 

Introduction

DZL series package boilers are horizontal three-pass water & fire tube boilers with a chain grate stoker structure. Threaded pyrotechnic tubes are arranged in the drum to form a convection heating surface, while the drum and the water walls on both sides form a radiation heating surface in the furnace. Each package system is fully installed and wired before being transported to site and is electrically controlled to provide functions such as stepless speed regulation for the stoker, threshold parameter alert and interlock protection.

Technical advantages

CNC manufacturing technology

The key processing technologies such as steel plate blanking, circling, drum and tube plate drilling adopt advanced CNC machining to reduce the assembly stress and prolong the service life of the boiler.

Steel tube cutting, thread tube pressing and convection tube processing all adopt advanced CNC technology.

Arched tube sheets and threaded fire tube was first adopted in China to increase heat transfer and completely solve the problem of cracking of the back tube sheet.

Chain grate plate and back smoke chamber plate is cut by CNC plasma cutting machine, which looks neat and beautiful.

Advanced welding process

The vertical and circumferential seam welding of the boiler adopts advanced automatic submerged arc welding technology to ensure the welding quality. All vertical and circumferential welds will go through 100% ray detection.

The welding of smoke tube and the tube plate adopts pre-expansion to eliminate the gap between the tube and tube plate, then be welded by automatic argon arc welding, which effectively eliminate stress and prolong boiler life.

The flange of the socket is welded by robots.

The chain grate is manufactured by our factory, and it is tested for 72 hours before leaving the factory to ensure that the tightness is moderate and won’t deviate.

Precision parts processing

Advanced manufacturing technology, using assembly line automatic spinning manufacturing.

Enhance heat transfer and raise boiler thermal efficiency.

Threaded smoke tubes are highly efficient heat transfer elements which is from many years research of our company. After continuous optimization, the heat transfer coefficient is 1.8 times higher than normal smoke tubes.

Unique structural design

Disturbed flue gas to ensure complete combustion of volatile matters.

The air volume takes about 30% of the total amount, and the wind speed is 50m³.

The independent secondary fan makes it easy to control and adjust the wind volume and pressure.

The high-temperature smoke generated by the combustion first enters the horoscope flue on both sides of the body from the tail (in this case, the boiler is water tube type), and the flue gas flows outside the tube.

The flue gas cooled by the horoscope flue enters the threaded tube (in this case the boiler is fire tube type) arranged in the drum from the front smoke chamber.

The flue gas will be exhausted from the back smoke chamber, this design fundamentally solves the problem of cracking of the tube sheet of a simple fire tube boiler.

 

DHL series biomass-fired steam boiler

Product thermal capacity: 20-75 t/h

Working pressure: 1.25-5.4 MPA

Outlet temperature: 184-485 ℃

Available fuel: Biomass

Available industries: Power generation, heating, chemical, food, rubber

 

 

 

Introduction

DHL corner tube boiler is field assembled boiler, it uses a piping system as the frame of the entire boiler, and it bears the full load of the boiler, which makes a non-framework boiler. At the same time, this frame also serves as the down comer of the boiler and upper and lower headers. The boiler drum is an external type drum, the furnace is a fully enclosed membrane wall structure, the convective heat absorbing surface adopts the flag tube structure. The corner tube boiler has the advantages of compact structure, low steel consumption and rapid temperature increase.

Technical advantages

Safe water circulation

The boiler adopts a unique water circulation structure, the drum is free from heat and the heated water flows in one direction. In the event of a power outage, the water system does not vaporize and the water circulation is safe and reliable.

Anti-seismic Structure

Corner tube boiler adopts non-framework structure, boiler proper weight is supported by membrane wall and down comer, and all membrane walls are all welded into one whole, with good anti-seismicity.

Complete sealed structure

All around the boiler proper is made of welded membrane walls, and the steel structure is completely sealed to prevent the occurrence of air leakage. The upper part of the boiler can be divided according to the size of the railway transportation limit. The excess air coefficient after the heating surface of the boiler tail is only less than 1.2, which not only reduces the heat loss of the exhaust fumes, reduces the power consumption of the induced draft fan, but also greatly reduces the environmental pollution of the boiler house.