CN206266517U - The system that a kind of fluidized bed coal gasification and calcium carbide smelt coupling - Google Patents

The system that a kind of fluidized bed coal gasification and calcium carbide smelt coupling Download PDF

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Publication number
CN206266517U
CN206266517U CN201621368224.9U CN201621368224U CN206266517U CN 206266517 U CN206266517 U CN 206266517U CN 201621368224 U CN201621368224 U CN 201621368224U CN 206266517 U CN206266517 U CN 206266517U
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China
Prior art keywords
calcium carbide
entrance
furnace
semicoke
gasification
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Expired - Fee Related
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CN201621368224.9U
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Chinese (zh)
Inventor
许修强
赵小楠
刘维娜
路丙川
郭启海
董宾
吴道洪
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Shenwu Environmental Technology Co Ltd
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Shenwu Environmental Technology Co Ltd
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Abstract

The utility model is related to the system that fluidized bed coal gasification and calcium carbide smelt coupling.The system includes fluidized-bed gasification furnace, mixing arrangement, high temp modeling appts, furnace of calcium carbide, and there is fluidized-bed gasification furnace coal entrance, gasification agent inlet, gas exit, semicoke to export;There is mixing arrangement semicoke entrance, CaO entrances, binding agent entrance, mixed powder to export, wherein, semicoke entrance is connected with semicoke outlet by heat-insulation conveying device;There is high temp modeling appts mixed powder entrance, mixing block to export, wherein, mixed powder entrance is connected with mixed powder outlet by heat-insulation conveying device;Furnace of calcium carbide has mixing block entrance, calcium carbide outlet, high temperature calcium carbide furnace gas export, wherein, mixing block entrance is connected with mixing block outlet by heat-insulation conveying device.System of the present utility model can produce calcium carbide using powdery semicoke with powdery CaO, while the sensible heat of gasification char and high temperature calcium carbide furnace gas is make use of, the recycling energy of high degree, reducing energy consumption.

Description

The system that a kind of fluidized bed coal gasification and calcium carbide smelt coupling
Technical field
The utility model is related to calcium carbide technical field of smelting, and in particular to a kind of fluidized bed coal gasification and calcium carbide smelt coupling System.
Background technology
The coking of coal, gasification and synthesis calcium carbide, for organic chemical industry's industry provides crude benzol, tar, oven gas, the conjunction enriched It is three core pathways of coal chemical technology into gas and acetylene.At present, coking of coal cost of investment is high, product purification is not enough, product Added value is not high.Coal Gasification Technology progress is slow, efficiency is low, small scale, industrialization level are low.By contrast, carbide acetylene work Skill route is simple, and added value of product is high, good in economic efficiency, has been carried out large-scale industrial production, is that one kind compares and has development The clean coal technology and the approach of Coal Chemical Industry of potentiality.Carbide acetylene can be used to synthesize benzene, rubber, polyvinyl chloride, polyacetylene etc. Organic products.Compared with oil ethene route, the raw material sources of carbide acetylene are extensive, cheap, equipment investment is low.Acetylene ratio Ethylene action is high, more conducively the carrying out of organic synthesis.
At present, the method for calcium carbide synthesis is mainly electrothermal way.The method converts electrical energy into heat energy by electric arc furnaces, heating Calcium carbide produced and combination reaction in melting lime and carbon raw coke there is.Electrothermal way is although with a long history, but there is high energy consumption, height The shortcoming of pollution.Calcium carbide synthetic reaction is a solid phase endothermic reaction, and raw material mass transfer, heat transfer efficiency are low, chemical dynamics process Time is long.High-temperature heating (2000~2200 DEG C) is needed, and needs the coke of high activity as raw material.High-temperature heating (2000~ 2200 DEG C) condition need substantial amounts of energy, the heat resistance requirement to equipment is high, increased cost of investment and energy consumption.Coke Typically obtained by the coking of coal, long flow path, organic carbon depletion are high, power consumption is high, environmental pollution is serious.In order to improve lime-calcium carbide The content of calcium carbide in congruent melting speed and product, will typically make lime excess 20wt% (wt% mass percents) in practical operation, Increased material consumption and energy consumption.Byproducts of carbon monoxide effusion reaction system has taken away substantial amounts of heat, causes energy loss.
The electrical efficiency and the thermal efficiency for improving furnace of calcium carbide are to reduce the power consumption in calcium carbide production at present, and improve capacity usage ratio Two big countermeasures, researcher proposes series and scheme.But, due to electrothermal way technique be based on lime with Coke direct reaction generates calcium carbide, is the solid phase endothermic reaction, and the electrical efficiency and the thermal efficiency of furnace of calcium carbide are improved anyway, all cannot Change the technique high energy consumption, high material-consumption, the present situation of high pollution.For the green for improving calcium carbide production energy, realizing calcium carbide production Change and sustainable development, it is necessary to reform electrothermal way synthetic route, using new calcium carbide synthesis technique and synthetic method.
In the gentle gasification of coal, byproduct semicoke will account for the 60wt%~90wt% of overall reaction product.In order to ensure The economy of the whole gentle gasification of coal, and industrialization is realized, it is necessary to our utilization semicokes economic, effectively and reasonably.Coal temperature Coal, ash content and reaction condition etc. are depended primarily on the property of gasification char.
Use and gently gasified with the fluid bed of larger ratio of water to coal, because gasification temperature is relatively low, efficiency of carbon con version is relatively low, Gu The product evaporated semicoke of body (residue after gasification) contains a large amount of unreacted carbon.At present, it is general for gasification char to be sent out using burning Electricity, the level of resources utilization is relatively low.Therefore, in the urgent need to developing a kind of high-valued utilization technique, to improve the utilization water of resource It is flat.
Prior art typically using block orchid carbon and block lime, is mixed by a certain percentage, is then fed into furnace of calcium carbide Carry out pyrolytic semlting.At present, material used by furnace of calcium carbide must be lump material, it is difficult to use semicoke powder, especially high temperature powder, Carry out calcium carbide production.Not yet have carries out the report of calcium carbide smelting using gentle gasification char as carbon materials.
Utility model content
The purpose of this utility model be provide it is a kind of can abundant higher value application gasification char system, the system can be sharp Calcium carbide and coal gas are prepared with powdery gasification char and powdery CaO, energy consumption is small.
The utility model provide firstly the system that a kind of fluidized bed coal gasification and calcium carbide smelt coupling, and the system includes Fluidized-bed gasification furnace, mixing arrangement, high temp modeling appts, furnace of calcium carbide.
There is the fluidized-bed gasification furnace coal entrance, gasification agent inlet, gas exit, semicoke to export.
There is the mixing arrangement semicoke entrance, CaO entrances, binding agent entrance, mixed powder to export.The semicoke entrance It is connected by heat-insulation conveying device with the semicoke outlet of the fluidized-bed gasification furnace.
There is the high temp modeling appts mixed powder entrance, mixing block to export.The mixed powder entrance with it is described The mixed powder outlet of mixing arrangement is connected by heat-insulation conveying device.
The furnace of calcium carbide has mixing block entrance, calcium carbide outlet, high temperature calcium carbide furnace gas export.The mixing block entrance It is connected by heat-insulation conveying device with the mixing block outlet of the high temp modeling appts.
Preferably, the system also includes preheater, and the preheater has powdery CaO entrances, preheating CaO outlets, height Warm calcium carbide furnace gas entrance, low temperature calcium carbide furnace gas export.
The preheating CaO outlets are connected with the CaO entrances of the mixing arrangement by heat-insulation conveying device, the high-temperature electric Stone furnace gas entrance is connected with the high temperature calcium carbide furnace gas export of the furnace of calcium carbide.
The utility model proposes fluidized bed coal gasification and calcium carbide smelt coupling system, fluidized gasification can be made full use of Coal gently gasifies the powdery gasification char of generation in stove.Using the system, can be while coal gas be prepared, using powdery gasification half It is burnt to produce calcium carbide with powdery CaO.Can simultaneously using gasification char and the sensible heat of high temperature calcium carbide furnace gas, the recovery profit of high degree With the energy, energy consumption is reduced.
Brief description of the drawings
Fig. 1 is the system schematic that the utility model fluidized bed coal gasification and calcium carbide smelt coupling.
Fig. 2 prepares the flow chart of coal gas and calcium carbide using the system shown in Fig. 1.
Reference in accompanying drawing is:
1st, fluidized-bed gasification furnace;2nd, preheater;3rd, mixing arrangement;4th, high temp modeling appts;5th, furnace of calcium carbide.
Specific embodiment
Below in conjunction with drawings and Examples, specific embodiment of the present utility model is described in more details, with Just scheme of the present utility model and the advantage of its various aspects be better understood when.However, specific implementations described below Mode and embodiment are only descriptive purposes, rather than to limitation of the present utility model.
As shown in figure 1, the fluidized bed coal gasification provided for the utility model and calcium carbide smelt the system schematic of coupling, bag Include fluidized-bed gasification furnace 1, preheater 2, mixing arrangement 3, high temp modeling appts 4, furnace of calcium carbide 5.
Fluidized-bed gasification furnace 1 reacts for coal gasification, generates coal gas and semicoke.It has coal entrance, gasification agent inlet, Gas exit, semicoke outlet.
The intensification that preheater 2 is used for powdery CaO is preheated, and obtains preheating CaO.There is powdery CaO entrances, preheating CaO to go out for it Mouth, high temperature calcium carbide furnace gas entrance, low temperature calcium carbide furnace gas export.
Mixing arrangement 3 is used for the mixing of semicoke and preheating CaO, obtains mixed powder.It has semicoke entrance, CaO entrances, Binding agent entrance, mixed powder outlet.Wherein, semicoke entrance conveys dress with the semicoke outlet of fluidized-bed gasification furnace 1 by being incubated Connection is put, CaO entrances are connected with the preheating CaO outlets of preheater 2 by heat-insulation conveying device.
High temp modeling appts 4 are used for the shaping of granular material, obtain lump material.It has mixed powder entrance, mixing Block is exported.Wherein, mixed powder entrance is connected with the mixed powder outlet of mixing arrangement 2 by heat-insulation conveying device.
Furnace of calcium carbide 5 is used to smelt the mixing block formed by semicoke and CaO, obtains calcium carbide.It has mixing block entrance, Calcium carbide outlet, high temperature calcium carbide furnace gas export.Wherein, mixing block entrance is logical with the mixing block outlet of institute's high temp modeling appts 4 Heat-insulation conveying device connection is crossed, high temperature calcium carbide furnace gas export is connected with the high temperature calcium carbide furnace gas entrance of preheater 2.
In the utility model, inventor has done isothermal holding to mixing arrangement 3 and high temp modeling appts 4, its inside Working environment is fire-retardant environment.Also, the conveying of the solid material in system between each device employs insulation conveying dress Put, while ensureing to be carried out under fire-retardant operating mode.Improve the utilization ratio of energy.
As shown in Fig. 2 the flow chart of coal gas and calcium carbide is prepared using the system shown in Fig. 1 for the utility model.Including step Suddenly:
(1) coal gasification
By coal and gasifying agent respectively via coal entrance and gasification agent inlet feeding fluidized-bed gasification furnace 1 in, be in temperature T1 850~950 DEG C, under conditions of pressure P≤0.1MPa, coal carries out partial gasification in gentle fluidized-bed gasification furnace, obtains coal gas And semicoke.
Wherein, the coal that the utility model is selected is middle low-rank coal, is had the following properties that:Particle diameter≤5 ㎜, the utility model Preferably≤3 ㎜ in embodiment;Moisture content≤the 8wt% of coal, ash fusion point >=1150 DEG C.Coal dries base content of ashes≤7wt%, Dry base volatile matter content >=30wt%.Index of cementation≤10 of coal, in the utility model embodiment preferably≤5.
Gasifying agent in the utility model is vapor and the mixed gas of oxygen.Wherein, vapor is 0.6MPa, 200 DEG C superheated steam.Oxygen is pure oxygen, and purity is 99.999%.
Wherein, vapor accounts for the percentage≤75wt% of coal, the utility model embodiment preferably≤60wt%.Oxygen accounts for coal Percentage≤15wt%, the utility model embodiment preferably≤10wt%.
(2) mix
The semicoke that above-mentioned steps are obtained, i.e. gasification char, by heat-insulation conveying device in the quilt close under conditions of gasification temperature Heat is delivered in mixing arrangement 3, temperature >=830 DEG C during feeding mixing arrangement 3.Simultaneously to added in mixing arrangement 3 heat CaO and Binding agent, and CaO and binding agent and the semicoke of heat temperature close.After mixing, can obtain the mixing of semicoke, CaO, binding agent Powder.
Wherein, CaO passes through the intensification preheating of preheater 2.The CaO that the utility model is selected is powdery, its particle diameter≤5 ㎜, preferred particle diameter is≤3 ㎜ in the utility model embodiment.Binding agent is dryness, powder binder, and it has at high temperature Good coheres and curing performance, can significantly increase the calorific intensity of molding materials.
Binding agent be based on coal as raw material is extracted and purified, the organic matter of devolatilization, then allocate into certain The mixture of the inorganic matter of amount.The binding agent has thermoplasticity and dispersive property higher, energy in large temperature range The liquid carbonized of promotion mixed material in semicoke, powdery CaO is enough well dispersed in, improves the softening meltbility of semicoke, make semicoke Anisotropy tissue becomes flourishing, the final calorific intensity for improving molding materials.
It is 0.60~0.70 to the semicoke, CaO, the quality proportioning of binding agent that are added in mixing arrangement 3:1:0.01~ 0.03, the quality proportioning can be controlled by quantitative conveyer.
(3) it is molded
The mixed powder that above-mentioned steps are obtained is added in high temp modeling appts 4 by mixed powder entrance, be can obtain Mixing block.
Also, temperature when mixed powder sends into high temp modeling appts 4 via heat-insulation conveying device is >=815 DEG C.
(4) calcium carbide is smelted
The mixing block that above-mentioned steps are obtained is added in furnace of calcium carbide 5 by mixing block entrance, is in temperature T2 Reaction obtains calcium carbide under conditions of 1650~2150 DEG C, and generates high temperature calcium carbide furnace gas.The utility model embodiment it is preferred anti- It is 1950 DEG C to answer temperature T2.
The heat-insulation conveying device set between each device in the utility model, it is ensured that enter the mixing block of furnace of calcium carbide 5 Temperature be not less than 50 DEG C of the operation temperature of fluidized-bed gasification furnace 1.When mixing block sends into furnace of calcium carbide 5 via heat-insulation conveying device Temperature >=800 DEG C.
The high temperature calcium carbide furnace gas that this step is obtained are admitted in preheater 2, are carried out directly or indirectly with powdery CaO therein Heat exchange, can make the temperature of CaO be increased to >=830 DEG C of sensible heats to reclaim high-temperature electric stone furnace gas, the low temperature calcium carbide furnace gas warp for obtaining Outer row after purification is up to standard.
Embodiment 1
It is 8% by particle diameter≤5mm, moisture content, to dry base content of ashes for 7%, dry base volatile matter content be 30%, ash Fusing point is 1150 DEG C, in the middle low-order coal that index of cementation is 10 and gasifying agent feeding fluidized-bed gasification furnace.Gasifying agent reclaimed water is steamed The percentage that gas accounts for coal is 75%, and oxygen accounts for the percentage 15% of coal.Temperature be 850 DEG C, under conditions of pressure 0.1MPa, in Low-order coal carries out partial gasification in fluidized-bed gasification furnace, obtains coal gas and semicoke.Semicoke is mixed by heat-insulation conveying device feeding Attach together in putting, while it is≤CaO and binding agent of 5mm to be added thereto to particle diameter, the quality proportioning of three is:Semicoke:CaO:It is viscous Knot agent=0.7:1:0.03, can obtain mixed powder.Mixed powder is added in high temp modeling appts, mixed block is can obtain Material.Then, mixing block is sent in furnace of calcium carbide, reaction obtains calcium carbide under conditions of being 2150 DEG C in temperature, and generates height Warm calcium carbide furnace gas.Wherein, high temperature calcium carbide furnace gas are passed through in preheater, and intensification preheating is carried out to powdery CaO.
Embodiment 2
It is 5.4% by particle diameter≤3mm, moisture content, dries base content of ashes for 6.5%, dries base volatile matter content and be 36%th, ash fusion point be 1204 DEG C, in the middle low-order coal that index of cementation is 5 and gasifying agent feeding fluidized-bed gasification furnace.Gasifying agent The percentage that middle vapor accounts for coal is 58%, and oxygen accounts for the percentage 10% of coal.Temperature be 950 DEG C, the bar of pressure 0.08MPa Under part, middle low-order coal carries out partial gasification in fluidized-bed gasification furnace, obtains coal gas and semicoke.By semicoke by heat-insulation conveying device In feeding mixing arrangement, while it is≤CaO and binding agent of 2.5mm to be added thereto to particle diameter, the quality proportioning of three is:Half It is burnt:CaO:Binding agent=0.64:1:0.015, can obtain mixed powder.Mixed powder is added in high temp modeling appts, can Obtain mixing block.Then, mixing block is sent in furnace of calcium carbide, reaction obtains electricity under conditions of being 2000 DEG C in temperature Stone, and generate high temperature calcium carbide furnace gas.Wherein, high temperature calcium carbide furnace gas are passed through in preheater, and intensification preheating is carried out to powdery CaO.
Embodiment 3
It is 4.7% by particle diameter≤2mm, moisture content, dries base content of ashes for 6.3%, dries base volatile matter content and be 34%th, ash fusion point be 1196 DEG C, in the middle low-order coal that index of cementation is 0 and gasifying agent feeding fluidized-bed gasification furnace.Gasifying agent The percentage that middle vapor accounts for coal is 60%, and oxygen accounts for the percentage 7.5% of coal.It is 900 DEG C, pressure 0.09MPa in temperature Under the conditions of, middle low-order coal carries out partial gasification in fluidized-bed gasification furnace, obtains coal gas and semicoke.By semicoke by insulation conveying dress Put in feeding mixing arrangement, while it is≤CaO and binding agent of 3mm to be added thereto to particle diameter, the quality proportioning of three is:Half It is burnt:CaO:Binding agent=0.60:1:0.01, can obtain mixed powder.Mixed powder is added in high temp modeling appts, can be obtained To mixing block.Then, mixing block is sent in furnace of calcium carbide, reaction obtains calcium carbide under conditions of being 1950 DEG C in temperature, And generate high temperature calcium carbide furnace gas.Wherein, high temperature calcium carbide furnace gas are passed through in preheater, and intensification preheating is carried out to powdery CaO.
Percentage in above-described embodiment is mass percent.
As seen from the above-described embodiment, system of the present utility model can be while coal gas be prepared, using powdery gasification char Calcium carbide is produced with powdery CaO.The recycling of the energy is realized, energy consumption is saved.
Finally it should be noted that:Obviously, above-described embodiment is only intended to clearly illustrate the utility model example, And not to the restriction of implementation method.For those of ordinary skill in the field, may be used also on the basis of the above description To make other changes in different forms.There is no need and unable to be exhaustive to all of implementation method.And thus Among the obvious change or variation amplified out are still in protection domain of the present utility model.

Claims (2)

1. the system that a kind of fluidized bed coal gasification and calcium carbide smelt coupling, it is characterised in that the system includes fluidized gasification Stove, mixing arrangement, high temp modeling appts, furnace of calcium carbide;
There is the fluidized-bed gasification furnace coal entrance, gasification agent inlet, gas exit, semicoke to export;
There is the mixing arrangement semicoke entrance, CaO entrances, binding agent entrance, mixed powder to export;The semicoke entrance and institute The semicoke outlet for stating fluidized-bed gasification furnace is connected by heat-insulation conveying device;
There is the high temp modeling appts mixed powder entrance, mixing block to export;The mixed powder entrance mixes with described The mixed powder outlet of device is connected by heat-insulation conveying device;
The furnace of calcium carbide has mixing block entrance, calcium carbide outlet, high temperature calcium carbide furnace gas export;Mixing block entrance and the institute The mixing block outlet for stating high temp modeling appts is connected by heat-insulation conveying device.
2. system according to claim 1, it is characterised in that also including preheater, there is the preheater powdery CaO to enter Mouth, preheating CaO outlets, high temperature calcium carbide furnace gas entrance, low temperature calcium carbide furnace gas export;
The preheating CaO outlets are connected with the CaO entrances of the mixing arrangement by heat-insulation conveying device, the high temperature furnace of calcium carbide Gas entrance is connected with the high temperature calcium carbide furnace gas export of the furnace of calcium carbide.
CN201621368224.9U 2016-12-13 2016-12-13 The system that a kind of fluidized bed coal gasification and calcium carbide smelt coupling Expired - Fee Related CN206266517U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106479576A (en) * 2016-12-13 2017-03-08 神雾环保技术股份有限公司 The system and method that a kind of fluidized bed coal gasification and calcium carbide smelt coupling

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106479576A (en) * 2016-12-13 2017-03-08 神雾环保技术股份有限公司 The system and method that a kind of fluidized bed coal gasification and calcium carbide smelt coupling

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