CN1314922C - Horizontal double-layer grate back firing boiler - Google Patents

Horizontal double-layer grate back firing boiler Download PDF

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Publication number
CN1314922C
CN1314922C CNB2005100493813A CN200510049381A CN1314922C CN 1314922 C CN1314922 C CN 1314922C CN B2005100493813 A CNB2005100493813 A CN B2005100493813A CN 200510049381 A CN200510049381 A CN 200510049381A CN 1314922 C CN1314922 C CN 1314922C
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China
Prior art keywords
boiler
smoke
grate
heat exchanger
pipe
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Expired - Fee Related
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CNB2005100493813A
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CN1673618A (en
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华元新
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华元新
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Priority to CNB2005100493813A priority Critical patent/CN1314922C/en
Publication of CN1673618A publication Critical patent/CN1673618A/en
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Publication of CN1314922C publication Critical patent/CN1314922C/en
Expired - Fee Related legal-status Critical Current
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Abstract

The present invention relates to a horizontal double-layer grate back burning boiler which comprises a boiler barrel, water cooling wall tubes, a combustion chamber, etc. The combustion chamber, a high temperature smoke chamber and a heat exchange chamber are respectively arranged in the boiler. The combustion chamber is positioned at the most front part of the boiler, the top of the combustion chamber is provided with an air inlet, and the lower part is provided with a water tube grate, a cast iron grate, a boiler door, a fire pulling door and a slag discharge mouth. High temperature smoke generated by the combustion chamber enters the high temperature smoke chamber by a smoke inlet hole, and the water tube grate and the boiler barrel form a heat exchange loop. The upper part of the heat exchange chamber is provided with the boiler barrel, the lower part is provided with an array tube type heat exchanger, and the boiler barrel and the array tube type heat exchanger are connected by a plurality of convection tubes, the water cooling wall tubes and descending tubes. Water inlet tubes are arranged on the array tube type heat exchanger, and the back end of the array tube type heat exchanger is provided with a smoke outlet tube. Because the present invention uses technologies, such as the independent combustion chamber, the high temperature smoke chamber, counterflow heat exchange modes, etc., the present invention enhances the burning-out rate of coal, reduces the smoke discharge temperature and the smoke content, and accordingly, greatly enhances the heat efficiency of the boiler so that the product has a good energy saving effect and an environmental protection effect.

Description

Horizontal double-layer grate back firing boiler
Technical field
The invention belongs to a kind of horizontal boiler, especially relate to a kind of horizontal double-layer grate back firing boiler.
Background technology
Horizontal hand-fired boiler is the conventional utility boiler of present boiler factory produce and market, and the structure of this boiler comprises: drum, water screen tube, down-comer, rear shed pipe, header and furnace wall etc.Be provided with smoke pipe in the drum, the both sides of drum outer wall respectively are provided with line-up's body water screen tube ribby, and the chamber in the middle of the two draining cold wall pipes is a burner hearth, and the burner hearth first half is provided with fixed grate, and air is sent into by air blast from furnace bottom.During work, coal burns on fire grate (just burning), emits the heating surface of heat transferred boiler, makes stove water water temperature raise produce steam and achieves the goal.Be not difficult to find out that the boiler of this structure has following characteristics: the high-temperature flue gas behind the coal combustion flows to rear smoke chamber from burner hearth, discharges behind the drum smoke pipe, and its flow process is generally three journeys.Therefore, high-temperature flue gas is to flow to high water temperature place (water temperature in the drum is higher) from low water temperature (water temperature in the water screen tube is lower), heat exchange is carried out in radiation and convection current in burner hearth, so the exhaust gas temperature of this boiler certainly will be higher than the temperature of saturated vapor in the drum, and the exhaust gas temperature height, the heat that flue gas is taken away is just many, has caused thermal losses, and also be rich in grit, contaminated environment in the dense black smoke.
Summary of the invention
For overcoming the above-mentioned defective of prior art, the purpose of this invention is to provide the novel horizontal double-layer grate back firing boiler of a kind of structure, this boiler has the advantage that heat transfer effect is good, exhaust gas temperature is low, thermal losses is little, has effects of energy conservation and environmental protection especially.
For solving the problems of the technologies described above, the present invention has adopted following technical scheme:
The structure of this horizontal double-layer grate back firing boiler comprises drum, water screen tube, down-comer, preceding rear shed pipe and combustion chamber etc., and drum is shelved on the top of whole boiler, and its inside is equipped with axial smoke pipe, and its main points are:
The below of the place ahead of drum, front end below and bottom to rear end is respectively equipped with combustion chamber, high temperature smoke-box and heat exchange chamber, and three Room isolate by furnace wall except that necessary passage;
The combustion chamber is positioned at the boiler forefront, be isolated into an independently chamber by furnace wall, its top is equipped with air intake, be provided with water pipe furnace grate, casting furnace grate downwards successively, the water pipe furnace grate top has fire door, has the door that pokes fire between water pipe furnace grate and casting furnace grate, and the casting furnace grate below is except that having slag-drip opening, also be provided with a smoke intaking hole with the intercommunication of high temperature smoke-box, be furnished with the water pipe heating surface in the high temperature smoke-box; Preceding canopy pipe, down-comer and the drum of water pipe furnace grate in the high temperature smoke-box constitutes a heat-exchanging loop; The heat exchange chamber also is an independent cavity, and top is drum, and the bottom is a tubular heat exchanger, and tubular heat exchanger is built-in with axial smoke pipe; Be connected by many convection tubes, water screen tube, down-comer between drum and tubular heat exchanger; Tubular heat exchanger is provided with water inlet pipe, and its rear end sets out smoke pipe.During work, air enters from furnace roof, provide combustion chambers burn required air, high-temperature flue gas behind the coal combustion enters the high temperature smoke-box through smoke intaking hole, enter the heat exchanging chamber chamber with the pot of flowing through of the heating surface (preceding canopy pipe, convection calandria) in the high temperature smoke-box behind the simple smoke pipe, and then enter the tubular heat exchanger smoke pipe and discharge out of the furnace by outlet flue.
During concrete enforcement, for further improving the thermal efficiency, also available another group water pipe furnace grate of casting furnace grate is replaced, and this group water pipe furnace grate and drum, tubular heat exchanger constitute heat-exchanging loop, make it to become double-deck water pipe furnace grate boiler.
During concrete enforcement, water inlet pipe is provided with the rear end that the position is in tubular heat exchanger.
Beneficial effect: the present invention compares with the boiler of prior art, owing to adopted independently technology such as combustion chamber (combustion chamber of the prior art is arranged on the centre position of two draining cold wall pipes of drum below), high temperature smoke-box and countercurrent heat exchange method, improved coal burn-off rate, reduced exhaust gas temperature and smoke content, thereby increased substantially the thermal efficiency of boiler, made this product have good especially effects of energy conservation and environmental protection.Why the present invention has above-mentioned effect, specifically is described below:
1, chamber temperature increases, and coal is fully burned.After independently the combustion chamber being set, the heat-transfer surface in the combustion chamber is few, the chamber wall accumulation of heat, thus improved chamber temperature, guaranteed coal fully burning at high temperature.
2, fuel gas and the combustible volatile after upper fire-grating (water pipe furnace grate) coal gasification obtains completing combustion in the high-temperature region, top of lower fire grating (casting furnace grate), and can not discharge boiler with flue gas.
3, set up the high temperature smoke-box after, the flue gas flow rate that enters behind the high temperature smoke-box is reduced suddenly, thereby makes the dust in flue gas gravitate be able to sedimentation, thereby reduced the concentration of discharging flue dust, reduced the pollution of flue dust to environment.
4, behind the change heat exchange mode, the flow direction of the flow direction of high-temperature flue gas and stove water is the reverse heat exchange of carrying out, thereby, improved the heat exchange effect, not only help reducing exhaust gas temperature, and improved the thermal efficiency.
5, replaced the left and right sides of the prior art header with tubular heat exchanger, thereby made this heat exchanger become the main heat-transfer surface of boiler, and made the flue gas of lower temperature and the water of the lower temperature in the tubular heat exchanger carry out heat exchange, exhaust gas temperature is greatly reduced.
Description of drawings
Accompanying drawing is vertical broken section structural representation of one embodiment of the invention.
The specific embodiment
Referring to accompanying drawing.Sequence number is represented respectively among the figure: slag-drip opening 1, casting furnace grate 2, the door 3 that pokes fire, combustion chamber 4, fire door 5, convection tube 6, air intake 7, furnace wall 8, gauge manifold 9, safety valve connecting pipe 10, suspension ring 11,14, cold hole 12, stop valve 13, drum 15, rear shed pipe 16, water screen tube 17, back header 18, pipe 19, tubular heat exchanger 20, high temperature smoke-box 21, front header 22, preceding canopy pipe 23, water pipe furnace grate 24, water inlet 25, water level meter 26, heat exchange chamber 27, smoke intaking hole 28, arrow is represented flue gas flow direction.
The structure of the horizontal double-layer grate back firing boiler of the embodiment of the invention is by drum 15, tubular heat exchanger 20, water screen tube 17, down-comer (among the figure draw in the end), convection tube 6, preceding canopy pipe 23, rear shed pipe 16, front header 22, back header 18 and casting furnace grate 2, water pipe furnace grate 24 compositions such as grade.
The below of the place ahead of drum 15, front end below and bottom to rear end is provided with combustion chamber 4, high temperature smoke-box 21 and heat exchange chamber 27 respectively, and above-mentioned three Room isolate by furnace wall 8 except that smoke intaking hole 28.Combustion chamber 4 is positioned at boiler head, be isolated into an independently chamber by furnace wall 8, its top is provided with air intake 7, be provided with water pipe furnace grate 24, casting furnace grate 2 downwards successively, water pipe furnace grate 24 tops have fire door 5, have the door 3 that pokes fire between water pipe furnace grate 24 and the casting furnace grate 2, the below of casting furnace grate 2 is except that outwards having slag-drip opening 1, also be provided with a smoke intaking hole 28 with 21 intercommunications of high temperature smoke-box, be furnished with convection heating surface in the high temperature smoke-box 21, high-temperature flue gas at first carries out heat exchange at this, has improved the heat exchange effect effectively.
(in fact preceding canopy pipe 23, the down-comer (in figure end draw) of water pipe furnace grate 24 (being furnace grate tube) in high temperature smoke-box 21 constitute a heat-exchanging loop with drum 15, water pipe furnace grate has many, therefore, the loop of formation is also a lot), make stove water can obtain continuous heat exchange.Heat exchange chamber 27 also is an independent cavity, and top is drum 15, and the bottom is a tubular heat exchanger 20, and tubular heat exchanger 20 inside are equipped with many axial smoke pipes, and the every interior flue gas of smoke pipe is collected to pipe 19 at last and discharges out of the furnace.Be connected by many convection tubes 6, water screen tube 17, down-comer between drum 15 and the tubular heat exchanger 20; Tubular heat exchanger 20 is provided with water inlet pipe 25, and when specifically implementing, water inlet pipe 25 should be located at the rear portion of tubular heat exchanger 20 as far as possible, to improve the countercurrent flow effect of water, reduces the cigarette temperature.
In addition, when specifically implementing, also available another group water pipe furnace grate of casting furnace grate 2 is replaced, and makes this group water pipe furnace grate and drum 15, tubular heat exchanger 20 constitute the multi-path heat exchange loop, to increase heat exchange area, avoids fire grate to burn out.
Tubular heat exchanger (also can be called lower drum by custom, but be different from the lower drum on the double-drum boiler meaning) has replaced the left and right sides header of existing boiler, and becomes the main heating surface of boiler heat exchange.Except water screen tube 17, down-comer, also arranged many convection tubes 6 between drum 15 and tubular heat exchanger 20, this structure has increased the heating surface area of boiler effectively.

Claims (3)

1, a kind of horizontal double-layer grate back firing boiler, structure comprises drum (15), water screen tube (17), down-comer, preceding canopy pipe (23), rear shed pipe (16) and combustion chamber, drum (15) is shelved on the top of whole boiler, it is built-in with axial smoke pipe, it is characterized in that: the below of the place ahead of drum (15), front end below and bottom to rear end is provided with combustion chamber (4), high temperature smoke-box (21) and heat exchange chamber (27) respectively, and three Room isolate by furnace wall except that necessary passage; Combustion chamber (4) is positioned at the boiler forefront, be isolated into an independently chamber by furnace wall (8), its top is equipped with air intake (7), be provided with water pipe furnace grate (24) downwards successively, casting furnace grate (2), water pipe furnace grate (24) top has fire door (5), have the door (3) that pokes fire between water pipe furnace grate (24) and casting furnace grate (2), casting furnace grate (2) below is except that having slag-drip opening (1), also be provided with a smoke intaking hole (28) with high temperature smoke-box (21) intercommunication, the high temperature smoke-box is furnished with the water pipe heating surface in (21), and the preceding canopy pipe (23) of water pipe furnace grate (24) in high temperature smoke-box (21) constitutes heat-exchanging loop with drum (15); Heat exchange chamber (27) also is an independent cavity, and top is drum (15), and the bottom is tubular heat exchanger (20), and tubular heat exchanger (20) is built-in with axial smoke pipe; Be connected by many convection tubes (6), water screen tube (17), down-comer between drum (15) and tubular heat exchanger (20); Tubular heat exchanger (20) is provided with water inlet pipe (25), and its rear end sets out smoke pipe (19).
2, a kind of horizontal double-layer grate back firing boiler as claimed in claim 1 is characterized in that: also available another group water pipe furnace grate of casting furnace grate (2) is replaced, and this group water pipe furnace grate and drum (15), tubular heat exchanger (20) constitute heat-exchanging loop.
3, a kind of horizontal double-layer grate back firing boiler as claimed in claim 1 is characterized in that: the position that water inlet pipe (25) is provided with is in the rear end of tubular heat exchanger (20).
CNB2005100493813A 2005-03-14 2005-03-14 Horizontal double-layer grate back firing boiler Expired - Fee Related CN1314922C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2005100493813A CN1314922C (en) 2005-03-14 2005-03-14 Horizontal double-layer grate back firing boiler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2005100493813A CN1314922C (en) 2005-03-14 2005-03-14 Horizontal double-layer grate back firing boiler

Publications (2)

Publication Number Publication Date
CN1673618A CN1673618A (en) 2005-09-28
CN1314922C true CN1314922C (en) 2007-05-09

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Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100467991C (en) * 2006-03-15 2009-03-11 华元新 Heat exchanger with collected boxes
CN100414170C (en) * 2006-03-15 2008-08-27 华元新 Horizontal back-burning boiler with double-layer fire grates
CN102788419A (en) * 2012-08-08 2012-11-21 安丰宝 Horizontal boiler

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3708020A1 (en) * 1987-03-12 1988-09-22 Michael Linder Grate for furnaces, boilers and the like
CN2053730U (en) * 1989-06-24 1990-02-28 吴江热管锅炉厂 Civil boiler with side-laid heat tube and grate back burning
CN1082173A (en) * 1993-07-08 1994-02-16 天津市蓟县能源研究所 Circulation-type horizontal heat tube boiler
CN2202247Y (en) * 1994-07-06 1995-06-28 刘翔 Horizontal double-drum steam boiler
CN2773549Y (en) * 2005-03-14 2006-04-19 华元新 Horizontal burning-back boiler with double-layer fire grate

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3708020A1 (en) * 1987-03-12 1988-09-22 Michael Linder Grate for furnaces, boilers and the like
CN2053730U (en) * 1989-06-24 1990-02-28 吴江热管锅炉厂 Civil boiler with side-laid heat tube and grate back burning
CN1082173A (en) * 1993-07-08 1994-02-16 天津市蓟县能源研究所 Circulation-type horizontal heat tube boiler
CN2202247Y (en) * 1994-07-06 1995-06-28 刘翔 Horizontal double-drum steam boiler
CN2773549Y (en) * 2005-03-14 2006-04-19 华元新 Horizontal burning-back boiler with double-layer fire grate

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Granted publication date: 20070509

Termination date: 20140314