CN102277198B

CN102277198B - Two-stage furnace and technology for preparing synthesis ammonia feed gas by virtue of gasification of cold type coal serving as raw material coal

Info

Publication number: CN102277198B
Application number: CN 201110194279
Authority: CN
Inventors: 蒋远华; 杨晓勤; 张道红; 何原; 卢光胜; 武丽华
Original assignee: Hubei Shuanghuan Science and Technology Stock Co Ltd
Current assignee: Hubei Shuanghuan Science and Technology Stock Co Ltd
Priority date: 2011-07-12
Filing date: 2011-07-12
Publication date: 2013-08-07
Anticipated expiration: 2031-07-12
Also published as: CN102277198A

Abstract

The invention relates to a two-stage furnace and technology for preparing synthesis ammonia feed gas by virtue of gasification of cold type coal serving as raw material coal. The two-stage furnace comprises a coal gas generation furnace, wherein a furnace grate is arranged in the coal gas generation furnace and is provided with an ash residue layer, and the ash residue layer is provided with a carbon layer. The two-stage furnace is characterized in that a taper-shaped water jacket is arranged in the coal gas generation furnace; the middle lower section in the taper-shaped water jacket is provided with an air flue; a space defined by the taper-shaped water jacket and the furnace grate forms a blowing smoke combustion chamber; high-temperature heat accumulators are accumulated in the smoke combustion chamber; and the bottom of the combustion chamber is provided with an air flue. In the two-stage furnace, the taper-shaped water jacket, the blowing smoke combustion chamber, the air paths and the other devices are installed in the coal gas generation furnace; during a blowing stage, the targets of eliminating a cold wall effect, causing returned coal to disappear, lowering carbon residue, improving the steam resolution ratio and lowering the production cost by burning coal in a zone near the inner wall of the taper-shaped water jacket and high-temperature smoke entering the combustion chamber are achieved.

Description

A kind of is two sections stoves and the technology of feed coal vaporizing system syngas for synthetic ammonia with the cold-pressed briquette

Technical field

The invention belongs to the improvement of bed gas metallization processes, especially a kind of is two sections stoves and the technology of feed coal vaporizing system syngas for synthetic ammonia with the cold-pressed briquette.

Background technology

Patent of invention 200910138231.8 discloses " a kind of is the technology for production of raw-material gas for synthetic ammonia by coal gasification in two stage oven of raw material with the cold-pressed briquette ", cold-pressed briquette enters in the producer gas generator from the moulded coal extrusion machine, be stored in the moulded coal oven dry section, in the blowing stage, air enters in the producer gas generator through the blowing valve, after the blowing flue gas goes out the type coal gasification section, part blowing flue gas is through three air valves, directly go the burning of three gas firing chambers, another part blowing flue gas is through moulded coal oven dry section, oven dry valve, mix with the blowing flue gas that goes out three air valves again, go the burning of three gas firing chambers; This in three gas firing chambers burning blowing flue gas and the synthetic venting of speeding, the high-temperature flue gas heating boiler that utilization produces, the way of a large amount of steam of output and superheated vapour is actually a kind of caving-in bash.Can be in producer gas generator efficient burning blowing flue gas, in time reclaim the high-temperature flue gas sensible heat, realize further energy-saving and cost-reducingly, be a urgent problem.

Summary of the invention

It is two sections stoves and the technology of feed coal vaporizing system syngas for synthetic ammonia with the cold-pressed briquette that technical problem to be solved by this invention provides a kind of, the flue gas of can efficient burning partly drying, in time reclaims the high-temperature flue gas sensible heat.

For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of is two sections stoves of feed coal vaporizing system syngas for synthetic ammonia with the cold-pressed briquette, it comprises producer gas generator, be provided with fire grate in the producer gas generator, fire grate is provided with ash bed, ash bed is provided with the charcoal layer, it is characterized in that: be provided with the taper water jacket in the producer gas generator, hypomere is equipped with air passageways in the taper water jacket; The space that taper water jacket and fire grate surround constitutes blowing smoke combustion chamber, and the indoor accumulation of smoke combustion has the high-temperature heat accumulation body, in the bottom, combustion chamber air passageways is installed.

The present invention is a kind of to be the technology of feed coal vaporizing system syngas for synthetic ammonia with the cold-pressed briquette, it comprises blowing and two stages of gas processed, and it is characterized in that: in the blowing stage, air divides three the tunnel to enter in the producer gas generator, the first via enters furnace bottom from the blowing valve, and burning coal produces blowing flue gas and lime-ash; The second the road from the taper water jacket, hypomere enters in the stove, burning coal produces blowing flue gas and lime-ash; Third Road enters from the bottom, combustion chamber, for the part blowing flue gas secondary combustion that enters in the combustion chamber provides oxygen, combustion parts blowing flue gas and dust, heat storage carries out heat exchange in the high-temperature flue gas that produces and the combustion chamber, and the flue gas after the cooling is the burning of workshop section three gas firing chambers after three air valves go again; Do not have another part blowing flue gas and the charcoal layer of burning to carry out heat exchange, cooling is gone the three gas firing chambers burning of back workshop section by the oven dry valve.In the blowing stage, entering the blowing flue-gas temperature of carrying out secondary combustion in the combustion chamber is 550-1050 ℃, and the flue-gas temperature of discharging the combustion chamber is 130-280 ℃; Described producer gas generator comprises producer gas generator, is provided with fire grate in the producer gas generator, and fire grate is provided with ash bed, and ash bed is provided with the charcoal layer, is provided with the taper water jacket in the producer gas generator, and hypomere is equipped with air passageways in the taper water jacket; The space that taper water jacket and fire grate surround constitutes blowing smoke combustion chamber, and the indoor accumulation of smoke combustion has the high-temperature heat accumulation body, in the bottom, combustion chamber air passageways is installed.

Gas stage technique processed of the present invention belongs to known technology, no longer is described in detail.

Beneficial effect:

1, the blowing stage, air from the taper water jacket, hypomere enters in the stove, burning coal produces blowing flue gas and lime-ash, and the lime-ash of generation is piled up in the taper water jacket, near the hypomere inwall, forms taper lime-ash chuck, pyrocarbon layer and water jacket inwall are separated, along with the disappearance of water jacket cold-wall effect, return burnt the disappearance, carbon residue reduces, gas making efficiency improves, and production cost reduces;

2, the blowing stage, partly dry flue gas and dust enter the combustion chamber and carry out secondary combustion, and the high-temperature heat accumulation body carries out heat exchange in the high-temperature flue gas of generation and the combustion chamber, reclaim the high-temperature flue gas sensible heat, overheated steam in the boiler, steam decomposition rate improves, vaporization ability significantly improves, and production cost reduces;

3, the high-temperature heat accumulation body of piling up in the combustion chamber can not only accumulation of heat, also has dedusting, desulfurization, anti-boiler face charcoal layer to blow to turn over, function such as wall built-up.

The present invention is equipped with devices such as taper water jacket, blowing smoke combustion chamber and air passageways in producer gas generator, the blowing stage, by burning taper water jacket inwall near zone coal with enter high temperature blowing flue gas in the combustion chamber, reached eliminate cold-wall effect, return burntly disappear, carbon residue reduces, steam decomposition rate improves, production cost reduces target.

Description of drawings

Fig. 1 is the dry process flow sheet in stage of the present invention;

Embodiment

Describe technical scheme of the present invention in detail below in conjunction with accompanying drawing

Embodiment 1

As shown in Figure 1, the present invention is two sections stoves of feed coal vaporizing system syngas for synthetic ammonia with the cold-pressed briquette, comprise producer gas generator 1, be provided with fire grate 9 in the producer gas generator 1, fire grate 9 is provided with ash bed 8, ash bed 8 is provided with charcoal layer 3, is provided with taper water jacket 18 in the producer gas generator 1, and hypomere is equipped with air passageways 15 in taper water jacket 18; Taper water jacket 18 constitutes blowing smoke combustion chamber 16 with the space that fire grate 9 surrounds, and piling up in the combustion chamber 16 has high-temperature

heat accumulation body

2, and 16 bottoms are equipped with air passageways 17 in the combustion chamber.

Synthesis technique of the present invention is that low sulfur content (rice coal extrusion molding) cold-pressed briquette enters in the producer gas generator 1 from fire door 4, and gas medium temperature is by

thermopair

5,10 and 11 online observations; In the blowing stage, air divides three the tunnel to enter in the producer gas generator 1: the first via enters furnace bottom from blowing valve 14, the ash bed 8 above fire grate 9 and the vehement hotbed of carbon 3 cloth wind, and burning coal produces blowing flue gas and new ash bed 8; The second the tunnel through taper water jacket cloth air-valve 12 in taper water jacket 18, hypomere inwall annex zone ash bed 8 and the vehement hotbed of carbon 3 cloth wind, burning coal produces blowing flue gas and new ash bed 8; Third Road through combustion chamber cloth air-valve 13 to combustion chamber heat storage 2 cloth wind, burning enters 550-1050 ℃ of high temperature blowing flue gas in the combustion chamber, produce that heat storage 2 carries out heat exchange in 550-1050 ℃ of high-temperature flue gas and the combustion chamber, cool to the workshop section three gas firing chambers burning after three air valves 7 go again of 130-280 ℃ of flue gas; After another part blowing flue gas that does not have a burning and charcoal layer 3 carried out heat exchange and cool to 50-100 ℃, drying valve 6 went to back workshop section three gas firing chambers to burn.

In the gas stage processed, up coal gas track route is the same with the blowing flue gas, and a part is through combustion chamber 2, and another part is through cold charcoal layer 3; The all 16 overheated fed to boiler gasifications through the combustion chamber of following steam blowing, detailed process no longer is described in detail.

Embodiment 2

During gasification high-sulfur (bituminous coal, brown coal) cold-pressed briquette, blowing stage and embodiment 1 the same operation, difference is that gas stage oven dry valve 6 processed is normally closed, and up coal gas is all sent through the combustion chamber, reduces the coal gas sulphur content.

Claims

1. one kind is the technology of feed coal vaporizing system syngas for synthetic ammonia with the cold-pressed briquette, it comprises blowing and two stages of gas processed, and it is characterized in that: in the blowing stage, air divides three the tunnel to enter in the producer gas generator, the first via enters furnace bottom from the blowing valve, and burning coal produces blowing flue gas and lime-ash; The second the road from the taper water jacket, hypomere enters in the stove, burning coal produces blowing flue gas and lime-ash; Third Road enters from the bottom, combustion chamber, for the part blowing flue gas secondary combustion that enters in the combustion chamber provides oxygen, in the blowing stage, entering the blowing flue-gas temperature of carrying out secondary combustion in the combustion chamber is 550 ~ 1050 ℃, and the flue-gas temperature of discharging the combustion chamber is 130 ~ 280 ℃, is provided with fire grate in the described producer gas generator, fire grate is provided with ash bed, ash bed is provided with the charcoal layer, is provided with the taper water jacket in the producer gas generator, and hypomere is equipped with air passageways in the taper water jacket; The space that taper water jacket and furnace wall surround constitutes blowing smoke combustion chamber, and the indoor accumulation of smoke combustion has the high-temperature heat accumulation body, in the bottom, combustion chamber air passageways is installed.