CN101475840B

CN101475840B - Gas generating furnace with hot wall

Info

Publication number: CN101475840B
Application number: CN 200910001011
Authority: CN
Inventors: 叶龙声; 张金辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-01-19
Filing date: 2009-01-19
Publication date: 2012-09-05
Anticipated expiration: 2029-01-19
Also published as: CN101475840A

Abstract

The invention belongs to the technical field of coal gas generation device and discloses a hot wall coal gas generating furnace. The furnace is mainly and structurally characterized in that the furnace comprises a furnace wall, the inner side of the furnace wall is provided with a temperature conduction heat insulation layer formed by heat-resistant concrete, and an upper coil and a lower coil are arranged in the temperature conduction heat insulation layer and are communicated through a vertical conduit; the inner side of the temperature conduction heat insulation layer is provided with a hot wall; and the inside of the temperature conduction heat insulation layer is doped with expanded perlite, expanded vermiculite and metal powder. In the hot wall coal gas generating furnace, a water cooled wall with a bird cage structure is arranged in the temperature conduction heat insulation layer and does not contact a high-temperature charcoal layer and a clinker layer in the furnace, so the safety factor of the use is quite high. The temperature of the hot wall of the inner layer is always maintained to be between 400 and 600 DEG C, so no fire cheating and wall clinging phenomena can be generated. The hot wall has less heat conduction, which ensures that the gas-making heat in the furnace is increased, the blowing time is shortened, the gas-making time is prolonged, the decomposition rate of steam is improved, and the yield of the coal gas generating furnace is improved.

Description

A kind of gas generating furnace with hot wall

Technical field

The invention belongs to the gazogene technical field, relate in particular to a kind of gas generating furnace with hot wall.

Background technology

Many at chemical fertilizer and methyl alcohol industry with producer gas generator system gas.The furnace wall of primary producer gas generator does not have water jacket, is prone to take place high temperature slagging scorification wall built-up problem.The producer gas generator that uses now generally is provided with the tubular water jacket, though solved high temperature slagging scorification wall built-up problem, also has following shortcoming:

1, takes advantage of fire.Prove that through Calculation of Heat Transfer chuck inwall top temperature is 130～140 ℃, water temperature is 120 ℃ in the chuck, and chuck is high by 2---3m.Chuck internal diameter ￠ 2610mm; Interior wall thickness 18mm; 40 kilocalories/hour/meters/degree of steel plate thermal conductivity; No fouling, the heat that the interior charcoal layer of then every stove is passed to water jacket is:

kilocalorie/hour, be equivalent to 753kg/h steam.This calculation result conforms to practical situation basically.Certainly it is big near zone of oxidation and high temperature reduction layer position steam production to be actually the middle and upper part; Bottom ash bed steam production seldom; But it is under no foul that chuck inwall top temperature can not surpass 140 ℃, otherwise the steam production that calculates can substantially exceed above value, is not inconsistent with practical situation.Thereby explain near the temperature of the charcoal layer of 80～100 millimeters of water jackets very lowly, be about 300～500 ℃, do not reach the ignition temperature of 700 ℃ in hard coal at all, say nothing of and to produce coal gas with steam reaction.So numerous coal cinders that do not reach point of ignition get into grey storehouse and form carbon residue, cause the huge waste of coal.In addition, atmospheric oxidation agent warp does not have here and charcoal plays oxidizing reaction, causes oxygen level height in the coal gas, and then causes the transformationreation of back workshop section, and water vapor consumption is increased.Cause steam to waste and the steam gasification agent is flowed through here not and charcoal reacts.

2, form dew point corrosion easily, especially the lower cover place.

3, the traditional water chuck is external pressure vessel concerning inwall.The most dangerous destruction of external pressure vessel is unstability.Inner wall temperature can overtemperature under the situation of fouling, and armor plate strength reduces rapidly, quincunx bulge or local bulge occur, Here it is unstable failure.Only be on the contrary minor casualty of chuck bulge, huge explosion hazard will take place if the water in the chuck gets into the pyrocarbon layer.

For finding an intermediate value, make neither wall built-up of producer gas generator, be unlikely again and take advantage of fire, take away the valuable heat of charcoal layer accumulative in the stove, the vapor pressure that the employing that has improves in the chuck improves the chuck inner wall temperature.But because vapor pressure can not carry very highly, the effect that overcomes the water wall effect just not clearly yet, and the danger that produces unstable failure along with the raising of vapor pressure increases sharply.The employing double-jacket that also has improves the chuck inner wall temperature, and skin is a water jacket, and internal layer is the thermal oil chuck, can thermal oil chuck inner wall temperature be brought up to 300～400 ℃.Really can significantly reduce the heat of deriving through calculating this way of proof from the charcoal layer.But because the thermal oil in the thermal oil chuck only plays heat transfer effect, do not circulate, security incidents such as the bulge of thermal oil chuck and the blast of catching fire also possibly appear in long-time running meeting coking and decomposition.

Summary of the invention

The technical problem that the present invention will solve just provide a kind of neither wall built-up, again do not take advantage of the fire gas generating furnace with hot wall.

For solving the problems of the technologies described above; The technical scheme that the present invention adopts is: comprise the furnace wall; The inboard of said furnace wall is provided with the warm thermofin of leading of heat resistance concrete formation; Lead being provided with coil pipe and lower coil pipe in the warm thermofin, last coil pipe and lower coil pipe are connected through vertical duct, and said inboard of leading warm thermofin is provided with hot wall; Described leading is doped with pearlstone, expanded vermiculite and metal powder in the warm thermofin.

A kind of gas generating furnace with hot wall provided by the present invention compared with prior art; The water wall that is made up of a birdcage structure last coil pipe, lower coil pipe and vertical duct substitutes original traditional water chuck; And this water wall is arranged on by what the multiple inorganic materials such as heat resistance concrete of certain thermal conductivity were formed and leads in the warm thermofin, and the inboard of leading warm thermofin is provided with the hot wall that high temperature resistant steel plate etc. constitutes.During use; In conjunction with temperature distribution situation in the stove, the thermal conductivity through multiple inorganic materials such as pearlstone, expanded vermiculite and metal powder in the adjustment heat resistance concrete maintains between 400～600 ℃ internal layer hot wall temperature all the time; Make near charcoal layer in the stove of hot wall and can reach comparatively high temps; Reach the diffusion controlled reaction temperature more than 900 ℃ in the gasification reaction district, it is extremely low that carbon residue is dropped to, and can not produce and take advantage of fiery phenomenon.Because the hot wall temperature can not surpass 600 ℃, can not produce the wall cling phenomenon that scabs simultaneously.The heat that hot wall is derived in the pyrocarbon is reduced to below 1/10th of heat that equal height traditional water chuck is derived; Making the interior charcoal layer accumulative of stove be used to make the gas heat increases greatly, thereby blow-time is shortened, system gas time lengthening; Steam decomposition rate improves, and producer gas generator output improves.Because the birdcage water wall of this gas generating furnace with hot wall at skin, is arranged on and leads in the warm thermofin, not pyrocarbon layer and ash bed in the contact oven, its coefficient safe in utilization is very high, can not go out security incident even hot wall has burnt out also.And the also more traditional tubular water jacket of birdcage structure is firm.

Description of drawings

Fig. 1 is the structural representation of a kind of gas generating furnace with hot wall of the present invention;

Fig. 2 is the structural representation of water wall.

Embodiment

Explain further details below in conjunction with the concrete structure and the use principle of accompanying drawing to a kind of gas generating furnace with hot wall of the present invention.

As shown in Figure 1; A kind of gas generating furnace with hot wall of the present invention comprises furnace wall 1; The inboard of furnace wall 1 is provided with the warm thermofin 2 of leading of heat resistance concrete formation; Lead and be provided with coil pipe 3 and lower coil pipe 4 in the warm thermofin 2, last coil pipe 3 is connected through vertical duct 5 with lower coil pipe 4, and the inboard of leading warm thermofin 2 is provided with the hot wall 6 of formation such as high temperature resistant steel plate.Lead in the warm thermofin 2 and be doped with multiple inorganic materials such as pearlstone, expanded vermiculite and metal powder.As shown in Figure 2, the water wall that last coil pipe 3, lower coil pipe 4 and vertical duct 5 constitute is a birdcage.

During producer gas generator work; Feed water in the birdcage water wall that upwards coil pipe 3, lower coil pipe 4 and vertical duct 5 constitute; Hot wall 6 conducts furnace heat to leading warm thermofin 2; Lead warm thermofin 2 heat is conducted to last coil pipe 3, lower coil pipe 4 and vertical duct 5, heat is taken away by the water in last coil pipe 3, lower coil pipe 4 and the vertical duct 5.In whole process; The heat that hot wall 6 is derived in the pyrocarbon is reduced to below 1/10th of heat that equal height traditional water chuck is derived; Making the interior charcoal layer accumulative of stove be used to make the gas heat increases greatly, thereby blow-time is shortened, system gas time lengthening; Steam decomposition rate improves, and producer gas generator output improves.In conjunction with temperature distribution situation in the stove; The thermal conductivity of leading multiple inorganic materials such as pearlstones, expanded vermiculite and metal powder in the warm thermofin 2 through adjustment heat resistance concrete formation; Internal layer hot wall 6 temperature are maintained between 400～600 ℃ all the time, make near charcoal layer in the stove of hot wall 6 to reach comparatively high temps, reach the diffusion controlled reaction temperature more than 900 ℃ in the gasification reaction district; It is extremely low that carbon residue is dropped to, and can not produce and take advantage of fiery phenomenon.Because hot wall 6 temperature can not surpass 600 ℃, can not produce the wall cling phenomenon that scabs simultaneously.The birdcage water wall that last coil pipe 3, lower coil pipe 4 and vertical duct 5 constitute is arranged on and leads in the warm thermofin 2 at skin, not pyrocarbon layer and ash bed in the contact oven, and its coefficient safe in utilization is very high, can not go out security incident even hot wall 6 has burnt out also.And the also more traditional tubular water jacket of birdcage structure is firm.

Claims

1. gas generating furnace with hot wall; Comprise the furnace wall; It is characterized in that: the inboard of said furnace wall is provided with the warm thermofin of leading of heat resistance concrete formation, leads being provided with coil pipe and lower coil pipe in the warm thermofin, and last coil pipe and lower coil pipe are connected through vertical duct; Said inboard of leading warm thermofin is provided with hot wall, and described leading is doped with pearlstone, expanded vermiculite and metal powder in the warm thermofin.