CN108728139A - A kind of pyrolysis of coal nitrogen-free process and system - Google Patents
A kind of pyrolysis of coal nitrogen-free process and system Download PDFInfo
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- CN108728139A CN108728139A CN201810813291.4A CN201810813291A CN108728139A CN 108728139 A CN108728139 A CN 108728139A CN 201810813291 A CN201810813291 A CN 201810813291A CN 108728139 A CN108728139 A CN 108728139A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B49/00—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated
- C10B49/02—Destructive distillation of solid carbonaceous materials by direct heating with heat-carrying agents including the partial combustion of the solid material to be treated with hot gases or vapours, e.g. hot gases obtained by partial combustion of the charge
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/18—Modifying the properties of the distillation gases in the oven
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- Engineering & Computer Science (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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- General Chemical & Material Sciences (AREA)
- Industrial Gases (AREA)
Abstract
A kind of pyrolysis of coal nitrogen-free process of present invention offer and system, using following four strands of unstripped gas as the fuel fluid for pyrolysis of coal：One is oxygen, one be after pyrolysis of coal through the low-pressure steam of Recovery Purifying, one be pyrolysis of coal after through the carbon dioxide of Recovery Purifying, one be pyrolysis of coal after through purifying the purification coal gas melted down.The present invention can be in reduction system invalid gas, reach efficient, energy-efficient effect.
Description
Technical field
The invention belongs to pyrolytic process of coal technical fields, and in particular to a kind of nitrogen-free low order pyrolytic process of coal method and be
System.
Background technology
China's energy distinguishing feature is " rich coal, oil-poor, few gas ", and endowment of resources determines the basic energy resource status of coal,
How to clean, efficiently, comprehensive utilization coal, be the important topic of state and society concern.
Pyrolytic process of coal produces semi-coke and coal gas, the solid product semi-coke of pyrolysis are used as clean fuel；The liquid of pyrolysis
Body product coal tar can be used as the ready-mixed oil of petrol and diesel oil after hydrogen by adding, and can also refine out the chemical products such as phenols；Pyrolysis
Gas products gas purification after can be used as fuel, can also be used as production chemical products synthesis gas.Compared to coal
Directly the direct gasification of burning and coal, pyrolysis of coal provide the higher product of a variety of added values, improve the comprehensive profit of coal
With rate.
Traditional internal heat type low order pyrolytic process of coal is air as combustion adjuvant, natural gas or firing tunnel in coking furnace as fuel, is passed
Coal gas nitrogen content high (nitrogen content is more than 40%), calorific value made of pyrolytic process of uniting are low, cannot be satisfied industrial need
It wants, the limit value purposes and value of coal gas.The purposes and value main method for improving raw coke oven gas reduce or eliminate in coal gas
Nitrogen.
If combustion adjuvant is changed to oxygen by firing tunnel in coking furnace burning, so that it may to achieve the purpose that coal gas denitrogenation upgrading.But oxygen
Gas and firing tunnel in coking furnace are directly mixed into stove, it will cause the local temperature in pyrolysis oven is excessively high, make the pyrolysis temperature part mistake of coal
It is high and uneven.
Pyrolysis installation is main at present or operation on a small scale, the coal gas of pyrolysis are used mainly as fuel.But coal is big
Scale pyrolysis production when, gas yield is too big, can only sub-fraction coal gas used as fuel, most of coal gas can only be made
For the raw material of the chemical products such as synthesizing methane or methanol.If synthesis gas of the coal gas as production chemical products, N2Content too
Height, the system circulation largely a large amount of energy consumption of invalid gas consumption and resource.
Invention content
The purpose of the present invention is to provide a kind of pyrolysis of coal nitrogen-free process and systems, it is possible to reduce invalid in system
Gas reaches efficient, energy-efficient effect.
The pyrolysis of coal nitrogen-free process of the present invention, using following four strands of unstripped gas as the The fuel stream for pyrolysis of coal
Body：One is oxygen, one be after pyrolysis of coal through the low-pressure steam of Recovery Purifying, one be pyrolysis of coal after through Recovery Purifying two
Carbonoxide, one for after pyrolysis of coal through purifying the purification coal gas melted down.
Wherein, the volume content of oxygen is 15%-30% in the fuel fluid.
Wherein, the pressure of the fuel fluid is 0.05-0.1MPa (G), and in terms of volume content, oxygen accounts in fuel fluid
15%-30%, low-pressure steam account for 10%-25%, carbon dioxide accounts for 10%-25%, purification coal gas accounts for 40%-60%.Further,
The volume ratio of low-pressure steam and carbon dioxide is preferably 1：(1-9).
Wherein, oxygen is room temperature in the fuel fluid, pressure is 0.05-0.1MPa (G), and low-pressure steam temperature is 100-
120 DEG C, pressure be 0.05-0.1MPa (G), carbon dioxide is room temperature, pressure is 0.05-0.1MPa (G), purification coal gas be normal
Temperature, pressure are 0.05-0.1MPa (G).
Wherein, by volume, group becomes the purification coal gas：CO 12-25%, H230-70%, CH415-30%.
Specifically, pyrolysis of coal nitrogen-free process of the present invention includes following processes：Fuel fluid in fuel element is through combustion
After burning, the high-temp combustion gas of generation enters for being pyrolyzed low-order coal in pyrolysis of coal unit, and low-order coal is pyrolyzed in pyrolysis of coal unit
Afterwards, solid portion is sent out through quenching unit quenching as semi-coke product, and coal tar is recycled in gas part through tar recovery unit, so
Enter clean unit afterwards to purify；Auto purification unit exports four strands of materials：After one is purified low-pressure steam, one is purification
Carbon dioxide, one be the purification coal gas melted down, one be dry gas product；Wherein, low-pressure steam, carbon dioxide and purification
Coal gas enters fuel element as unstripped gas and one oxygen mix as fuel fluid, and dry gas product is sent out as product.
Further, ignition temperature is 600-1000 DEG C in the fuel element；Pyrolysis of coal temperature in the pyrolysis of coal unit
It is 500-800 DEG C；The gas portion temperature produced from 2 gas vent of pyrolysis of coal unit is 80-100 DEG C, and gas is formed with volume
Accounting is calculated as：CO26%-25%, CO 8-14%, H220-60%, CH410-20%, CmHn 1-30%, also minute quantity
Other gases.
The pyrolysis of coal nitrogen-free process system of the present invention, including the recycling of sequentially connected fuel element, pyrolysis of coal unit, tar
Unit and clean unit, the fuel element are equipped with air distribution system, and the air distribution system has following four gas distribution pipelines：Oxygen
Pipeline, the carbon dioxide conduit being connect with clean unit, is connect with clean unit the low-pressure steam pipeline being connect with clean unit
Purification gas piping.
Wherein, the fuel element is burner.
Wherein, the pyrolysis of coal unit is internal heat type pyrolysis oven, and the pyrolysis of coal unit is also configured with quenching unit.
Wherein, the tar recovery unit includes sequentially connected gas-liquid separator, cooling tower, electrical tar precipitator, whirlwind
Catcher, whirlwind catcher are connected with Ammonia recovery unit later, and Ammonia recovery unit passes through circulating line and gas-liquid separator
Connection.
Wherein, the clean unit includes gas desulfurizer, converting means and decarbonization device.
Pyrolysis of coal nitrogen-free process and system provided by the present invention have following advantage：Using oxygen in lieu of air
As comburant, low-order coal is made to realize pyrolysis under nitrogen-free process conditions, improves pyrolysis of coal dry gas product and produced as chemical industry
Application value in terms of the high added values such as product synthesis gas, and resource and energy consumption are reduced, while by rational gas preparing, avoiding
The defects of local temperature that oxygen belt comes is excessively high, pyrolysis of coal is uneven.
Description of the drawings
The attached drawing for constituting the part of the present invention is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is the structural schematic diagram of present invention process method and system.
Specific implementation mode
In order to better understand the present invention, with reference to specific attached drawing, the present invention will be described in detail.
Pyrolysis of coal nitrogen-free process system provided by the invention, as shown in Figure 1, including fuel element 1, pyrolysis of coal unit 2, coke
Oily recovery unit 3 and clean unit 4.For fuel fluid in fuel element 1 after burning, the high-temp combustion gas of generation enters coal heat
For being pyrolyzed low-order coal in solution unit 2, after low-order coal is pyrolyzed in pyrolysis of coal unit 2, (figure is not through quenching unit for solid portion
Show) as the submitting of semi-coke product, coal tar is recycled in gas part through tar recovery unit 3, net subsequently into clean unit 4 for quenching
Change.
Fuel fluid in fuel element 1 includes four strands of unstripped gas：One is from externally input oxygen, one is purification
Low-pressure steam that unit 4 recycles, the carbon dioxide that one be the recycling of clean unit 4, one be purification coal that clean unit 4 melts down
Gas.After unstripped gas mixing, the volume content of oxygen is 15%-30% in fuel fluid, is substituted in original technique using oxygen
Air is conducive to achieve the purpose that coal gas denitrogenation upgrading as fuel gas, at the same control oxygen content and be mixed into low-pressure steam and
Carbon dioxide, can avoid in pyrolysis oven that local temperature is excessively high, makes pyrolysis of coal locally excessively high and non-uniform phenomenon.Fuel element
1 may be used conventional burner, and configuration of the air distribution system for fuel fluid can be separately configured in fuel element 1.
Further, after unstripped gas mixing, the pressure of fuel fluid is 0.05-0.1MPa (G).Purify coal gas volume flow root
It is obtained according to the required heat Calculation of unit scale, oxygen volume flow is obtained according to the ingredient and flow rate calculation of coal gas, low pressure
The flow of steam and carbon dioxide is to control temperature automatic adjustment in pyrolysis oven.Wherein, oxygen is room temperature, pressure 0.05-
0.1MPa (G), low-pressure steam temperature is 100-120 DEG C, pressure is 0.05-0.1MPa (G), and carbon dioxide is room temperature, pressure is
0.05-0.1MPa (G), purification coal gas is room temperature, pressure is 0.05-0.1MPa (G)；In terms of volume content, oxygen in fuel fluid
Gas accounts for 15%-30%, low-pressure steam accounts for 10%-25%, carbon dioxide accounts for 10%-25%, purification coal gas accounts for 40%-60%, low
It is preferably 1 to press the volume ratio of steam and carbon dioxide：(1-9).Unstripped gas especially low-pressure steam and carbon dioxide distribution ratio
Control play the role of good control and regulation to combustion flame temperature, theoretically flame temperature with oxygen concentration increase
And increase, the flow of low-pressure steam and carbon dioxide is controlled, also just controls oxygen concentration and burning situation so that ignition temperature
Control ensure that pyrolysis of coal temperature plateau with uniformly, effectively prevent localized hyperthermia at 600-1000 DEG C.
Conventional internal heat type pyrolysis oven may be used in pyrolysis of coal unit 2, also can be considered low-order coal device for improving quality.Internal heat type heat
Solution stove can be divided into three sections：Dryer section, retort section, cooling section.Low-order coal is pyrolyzed furnace roof in the form of lump coal or coal dust from internal heat type
Portion lands from top to bottom, be in direct contact with the high-temp combustion circulation of vital energy in the wrong direction stream from fuel element 1 it is heated, when furnace roof feed moisture about
When 15%, 1.0% can be removed to hereinafter, about 250 DEG C of the hot gas of sailing against the current then is cooled to 80-100 DEG C, after dry in dryer section
Low-order coal be heated to about 500-800 DEG C by 600-1000 DEG C of oxygen-free combustion gas in retort section, thermally decompose, hot gas
It is cooled to about 250 DEG C.After low order pyrolysis of coal, solid portion is cooled down through cooling section, then becomes orchid after quenching unit carries out quenching
Charcoal product is produced from pyrolysis of coal unit 2；Gas part from the extraction temperature of 2 gas vent of pyrolysis of coal unit be 80-100 DEG C, gas
Body composition is calculated as with volume accounting：CO26%-25%, CO 8-14%, H220-60%, CH410-20%, CmHn 1-30%,
Other also minimal amount of gases.Existing coke quenching device may be used in quenching unit, can also use and be formulated with coke quenching device
Existing internal heat type pyrolysis oven product.
In tar recovery unit 3, into gas-liquid point after being mixed from the gas part that pyrolysis of coal unit 2 produces with cyclic ammonia water
From device, separation gas out enters cooling tower by gas-liquid separator top, will using the ammonium hydroxide of oil-water separation tank in cooling tower
Gas cooling is detached to 25 DEG C, is then discharged from cooling tower top, passes through electrical tar precipitator successively after wind turbine pressurizes, whirlwind is caught
Device is caught, removes the tar carried secretly in separator, the tar of removal is produced as coai-tar product, except defocused gas will be therein
After Ammonia recovery enter clean unit 4, recycling ammonia as cyclic ammonia water raw material with from pyrolysis of coal unit 2 extraction gas part
Mixing.Conventional any coke tar recovery system may be used in the concrete structure of above-mentioned tar recovery unit 3 or device is substituted and realized,
Purpose is to recycle coai-tar product therein.
Clean unit 4 includes gas desulfurizer, converting means and decarbonization device, is existing conventional equipment product.
Auto purification unit 4 can export four strands of materials：One is purified low-pressure steam, one is purified carbon dioxide, one
Stock is the purification coal gas melted down, one is dry gas product；Purification coal gas can be the part shunting gas in dry gas product
Body.Wherein, low-pressure steam, carbon dioxide and purification coal gas are as unstripped gas, after (if desired) or without temperature-adjustment pressure-adjustment
Being sent into fuel element 1 becomes a part for fuel fluid；It is suitble in temperature, pressure, accounting, low-pressure steam, titanium dioxide
Several strands in carbon and purification coal gas can also merge output in auto purification unit 4.In dry gas product by volume, group becomes：
CO 12-25%, H230-70%, CH415-30% can be fired as the synthesis gas of production chemical products or as high heating value
Gas has higher application value.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention god.
Claims (10)
1. a kind of pyrolysis of coal nitrogen-free process, using following four strands of unstripped gas as the fuel fluid for pyrolysis of coal：One
For oxygen, one be after pyrolysis of coal through the low-pressure steam of Recovery Purifying, one be pyrolysis of coal after carbon dioxide through Recovery Purifying,
One for after pyrolysis of coal through purifying the purification coal gas melted down.
2. pyrolysis of coal nitrogen-free process according to claim 1, which is characterized in that the body of oxygen in the fuel fluid
Product content is 15%-30%.
3. pyrolysis of coal nitrogen-free process according to claim 1, which is characterized in that the pressure of the fuel fluid is
0.05-0.1MPa (G), in terms of volume content, oxygen accounts for 15%-30% in fuel fluid, low-pressure steam accounts for 10%-25%, two
Carbonoxide accounts for 10%-25%, purification coal gas accounts for 40%-60%.
4. pyrolysis of coal nitrogen-free process according to claim 3, which is characterized in that the body of low-pressure steam and carbon dioxide
Product is than preferably 1：(1-9).
5. pyrolysis of coal nitrogen-free process according to claim 1, which is characterized in that oxygen is normal in the fuel fluid
Temperature, pressure are 0.05-0.1MPa (G), and low-pressure steam temperature is 100-120 DEG C, pressure is 0.05-0.1MPa (G), carbon dioxide
It is 0.05-0.1MPa (G) for room temperature, pressure, purification coal gas is room temperature, pressure is 0.05-0.1MPa (G).
6. pyrolysis of coal nitrogen-free process according to claim 1, which is characterized in that the purification coal gas by volume,
Group becomes：CO 12-25%, H230-70%, CH415-30%.
7. pyrolysis of coal nitrogen-free process according to claim 1, which is characterized in that pyrolysis of coal nitrogen-free of the present invention technique side
Method includes following processes：After burning, the high-temp combustion gas of generation enters in pyrolysis of coal unit fuel fluid in fuel element
For being pyrolyzed low-order coal, after low-order coal is pyrolyzed in pyrolysis of coal unit, solid portion becomes semi-coke product through quenching unit quenching
It sends out, coal tar is recycled in gas part through tar recovery unit, is purified subsequently into clean unit；Auto purification unit exports four strands
Material：One for purified low-pressure steam, one be purified carbon dioxide, one be the purification coal gas melted down, one
For dry gas product；Wherein, low-pressure steam, carbon dioxide and purification coal gas as unstripped gas and one oxygen mix as fuel
Fluid enters fuel element, and dry gas product is sent out as product.
8. pyrolysis of coal nitrogen-free process according to claim 1, which is characterized in that ignition temperature in the fuel element
It is 600-1000 DEG C；Pyrolysis of coal temperature is 500-800 DEG C in the pyrolysis of coal unit；It is produced from 2 gas vent of pyrolysis of coal unit
Gas portion temperature be 80-100 DEG C, gas composition be calculated as with volume accounting：CO26%-25%, CO 8-14%, H2 20-
60%, CH410-20%, CmHn 1-30%, other also minimal amount of gases.
9. a kind of pyrolysis of coal nitrogen-free process system, including sequentially connected fuel element, pyrolysis of coal unit, tar recovery unit and
Clean unit, the fuel element are equipped with air distribution system, and the air distribution system has following four gas distribution pipelines：Oxygen channel,
The low-pressure steam pipeline that is connect with clean unit, the carbon dioxide conduit being connect with clean unit, connect with clean unit it is net
Change gas piping.
10. pyrolysis of coal nitrogen-free process system according to claim 9, which is characterized in that
The fuel element is burner；
The pyrolysis of coal unit is internal heat type pyrolysis oven, and the pyrolysis of coal unit is also configured with quenching unit；
The tar recovery unit includes sequentially connected gas-liquid separator, cooling tower, electrical tar precipitator, whirlwind catcher, rotation
It is connected with Ammonia recovery unit after wind catcher, Ammonia recovery unit is connect by circulating line with gas-liquid separator；
The clean unit includes gas desulfurizer, converting means and decarbonization device.
Priority Applications (1)
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| CN201810813291.4A CN108728139A (en) | 2018-07-23 | 2018-07-23 | A kind of pyrolysis of coal nitrogen-free process and system |
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| CN201810813291.4A CN108728139A (en) | 2018-07-23 | 2018-07-23 | A kind of pyrolysis of coal nitrogen-free process and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112812794A (en) * | 2020-12-12 | 2021-05-18 | 四川亚联高科技股份有限公司 | Carbon return process for semi-coke oven gas production, semi-coke production process and system |
| CN113801672A (en) * | 2021-10-25 | 2021-12-17 | 昆明理工大学 | Improved method of internal hot ram charcoal furnace production process based on carbon dioxide protection |
-
2018
- 2018-07-23 CN CN201810813291.4A patent/CN108728139A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112812794A (en) * | 2020-12-12 | 2021-05-18 | 四川亚联高科技股份有限公司 | Carbon return process for semi-coke oven gas production, semi-coke production process and system |
| CN113801672A (en) * | 2021-10-25 | 2021-12-17 | 昆明理工大学 | Improved method of internal hot ram charcoal furnace production process based on carbon dioxide protection |
| CN113801672B (en) * | 2021-10-25 | 2024-04-05 | 昆明理工大学 | Method for improving production process of internal thermal semi-coke furnace based on carbon dioxide protection |
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