CN2163311Y

CN2163311Y - Boiler with double fire grate

Info

Publication number: CN2163311Y
Application number: CN 93231173
Authority: CN
Inventors: 孙荣清
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-16
Filing date: 1993-06-16
Publication date: 1994-04-27
Anticipated expiration: 2003-06-16

Abstract

The utility model provides a double-grate boiler which is composed of a water jacket, a water cooling grate, a lower grate, a fuel tank, a coal pushing device, a thermal insulation layer and a dust remover. Coal is added in the utility model through the coal pushing device and the utility model has the advantages of obvious effect of smoke and dust removal and strong adaptability of coal. The water cooling grate can be dismounted for maintenance and replacement, and can realize forced circulation and secondary heating, effectively improving thermal efficiency of the utility model.

Description

Boiler with double fire grate

The utility model relates to a kind of boiler, especially a kind of double grate boiler that adopts pusher firing method.

At present, the vertical or horizontal hand-fired boiler that vast enterprises and institutions generally use mostly adopts the double grate backfire, and this boiler has smoke medicining dust-removing effect characteristics preferably, but also exists the drawback that some is difficult to overcome.At first, the steel pipe manufacturing that the upper fire-grating of vertical double grate boiler is communicated with the boiler water space respectively by several two ends arranged side by side, during operation, coal directly burns on furnace grate tube, flame passes its gap and flows downward, and under mal-condition like this, the cooling capacity of fire grate in-pipe flow Natural Circulation is limited, under the situation that feedwater water quality can not meet the demands, cause the overheated generation distortion of furnace grate tube especially.Facts have proved that the upper fire-grating pipe generally about 1 year, was just burnt in serious three months, have pipe explosion accident to take place often.Simultaneously because reasons in structure is repaired difficulty, boiler is often when other most of parts are comparatively intact, because upper fire-grating loss of security energy and scrapping prematurely.On the other hand, water-cooled degree that this type of boiler is anti-when burning is big, and coal adaptability is poor, can only use the higher III class bituminous coal of fugitive constituent.Moreover, need enough big flow area during the anti-fire of upper fire-grating, during the less smalls of coal that the use coking behavior is relatively poor and particle, " Durchgangshohle " phenomenon appears in upper fire-grating coal seam easily, influences smoke medicining dust-removing effect.Though horizontal double grate boiler can make the non-rigid connection of upper fire-grating, other drawbacks still exist.Therefore the scope of application of present popular double grate boiler is restricted.

The purpose of this utility model provides that a kind of both smoke medicining dust-removing effects are good, and coal adaptability is strong again, the propelling firing method double grate boiler that upper fire-grating detachably overhauls and changes.

The utility model can be realized by following measure: this boiler is provided with evacuation port 1, hot water outlet 2, convection heating surface 4, water jacket 6, water inlet 7, water-cooled grate 8, lower fire grating 10, deduster 14, fire door 15, cleanout door 17 according to common double grate boiler.Its improvements are that water-cooled grate 8 is flexible connection with the boiler joint, be connected with passage 16 below the water-cooled grate 8 in boiler, one side of water jacket 6 has Bunker 5, water-cooled grate 8 is provided with post bake import 18, is provided with arch nose 13 at the exhaust gases passes between water-cooled grate 8 and convection heating surface 4.

For reducing heat loss, boiler is surrounded by heat-insulation layer 20 outward routinely.The utility model with wind of nature and mechanical secondary wind hybrid mode, is finished coal task by pushing away device for coal 9 advance and retreat to elegance.The combustion chamber is divided into upper and lower two burner hearths by water-cooled grate 8, and upper furnace is a main chamber, and lower hearth is a secondary furnace.The both sides, combustion chamber are arranged the arch nose 13 that is coated with fire clay respectively, the convection heating surface 4 that top is formed for several flues.Bunker 5 be designed to infundibulate or " " shape.In the bottom of boiler air inlet 11 is arranged.

Double grate boiler described in the utility model is the boiler of horizontal boiler, vertical boiler or other patterns.

The course of work described in the utility model:

1, burning: soft coal is added in the Bunker 5, and the bottom communicates with upper furnace, pushes away device for coal 9 by manpower or driven by power and does to be interrupted reciprocating motion along pushing away device for coal passage 22, constantly pushes soft coal to water-cooled grate 8.When soft coal moves upward forward gradually,, and be coke basically on the fuel bed surface by heating gradually, dry and separate out volatile matter and fire burns.Volatile matter and the air mixture coke layer of flowing through, active combustion in the coke space, unburnt coke falls on the lower fire grating 10 to burn away through passage 21 under the promotion of soft coal.Owing to volatile matter in the coal seam on the water-cooled grate 8 burns in coke layer, the imperfect combustion gas in top, coal seam is less, and the unlikely thermal decomposition of volatile matter produces carbon black, thereby reaches the purpose of smoke abatement and dust control.In addition, fuel has a small amount of coal and does not leave out by mistake on the lower fire grating 10 by the air vent of water-cooled grate 8 when travelling forward, because the existing volatile matter of this part conny is separated out limited amount, and the violent disturbance of air in the lower hearth.Also not having black smoke produces.

During normal combustion, close 15, wind of fire door and entered by cleanout door 17, its aperture is regulated according to burning; Machinery secondary wind is sent into by air inlet 11, enters lower hearth through passage 16, and after high-temperature flue gas mixed, a part was through passage 21 risings and the fierce mixed combustion of the coke layer on the water-cooled grate 8, and a part enters fuel bed through the air vent of water-cooled grate 8.During operation,, can increase the flowing resistance of passage 21 by the lower hearth coke build-up for guaranteeing the ventilation of water-cooled grate 8.

High-temperature flue gas washes away convection heating surface 4 behind arch nose 13 bafflings, enter atmosphere through outlet flue 3 and deduster 14 by chimney 12.

2, produce hot water: feedwater heat absorption in water inlet 7 enters water jacket 6 is risen, and enters water-cooled grate 8 interior secondary heat absorption backs by hot water outlet 2 and post bake import 18 and supplies with hot user.Safe and reliable for guaranteeing, the water outlet side of water-cooled grate 8 has blast pipe to link to each other with the evacuation port 1 of upper boiler.

Fig. 1 is the front elevational schematic of double grate boiler;

Fig. 2 is the A-A profile of front view 1;

Wherein, 1-evacuation port, 2-hot water outlet, 3-outlet flue, the 4-convection heating surface, 5-Bunker, 6-water jacket, 7-water inlet, the 8-water-cooled grate, 9-pushes away device for coal, 10-lower fire grating, 11-air inlet, the 12-chimney, 13-arch nose, 14-deduster, 15-fire door, the 16-passage, 17-cleanout door, the import of 18-post bake, 19-sewage draining exit, the 20-heat-insulation layer, 21-passage, 22-push away the device for coal passage.

The utility model has the following advantages compared to existing technology:

1, when satisfying the smoke abatement and dust control requirement, coal adaptability is strong, and except should not using coking capacity coal very strong and inferior, other coals can both adapt to.

2, water-cooled grate detachably overhauls and changes, and has improved boiler safety performance and service life.

3, adopt cooled water grating reinforced circulation secondary mode of heating, guarantee hot water effluent's temperature, effectively improved boiler thermal output.

Claims

1, a kind of double grate boiler, by evacuation port (1), hot water outlet (2), convection heating surface (4), water jacket (6), water inlet (7), water-cooled grate (8), lower fire grating (10), deduster (14), fire door (15), cleanout door (17) constitutes, it is characterized in that water-cooled grate (8) and boiler joint are flexible connection, the below of the water-cooled grate in boiler (8) is connected with passage (16), one side of water jacket (6) has Bunker (5), the top of water-cooled grate (8) has for the passage (22) that pushes away device for coal (9) advance and retreat, water-cooled grate (8) is provided with post bake import (18), and arch nose (13) is positioned between water-cooled grate (8) and the convection heating surface (4).

2, a kind of double grate boiler according to claim 1, it is characterized in that Bunker (5) be infundibulate or " " shape, air inlet (11) is arranged at the boiler bottom.