CN210736655U - Processing system of fine coal - Google Patents
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- CN210736655U CN210736655U CN201921078480.8U CN201921078480U CN210736655U CN 210736655 U CN210736655 U CN 210736655U CN 201921078480 U CN201921078480 U CN 201921078480U CN 210736655 U CN210736655 U CN 210736655U
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Abstract
The utility model provides a processing system of pulverized coal, which comprises a pulverized coal pyrolysis or pulverized coal gasification device, a tar hydrocracking device and a Fischer-Tropsch synthesis device; the pulverized coal pyrolysis or pulverized coal gasification device is at least provided with a raw material inlet, a gas outlet and a tar outlet; the tar hydrocracking device is at least provided with a tar raw material inlet, a hydrogen inlet, an FT diesel raw material inlet, a low-gas-separation outlet and an impurity outlet containing sulfur and nitrogen; the Fischer-Tropsch synthesis device is at least provided with a synthesis gas inlet and a FT diesel oil outlet; a tar outlet of the pulverized coal pyrolysis or pulverized coal gasification device is connected with a tar raw material inlet of the tar hydrocracking device through a pipeline; a gas outlet of the pulverized coal pyrolysis or pulverized coal gasification device is connected with a synthetic gas inlet of the Fischer-Tropsch synthesis device through a pipeline; the FT diesel oil outlet of the Fischer-Tropsch synthesis device is connected with the FT diesel oil raw material inlet of the tar hydrocracking device through a pipeline.
Description
Technical Field
The utility model relates to a processing system of fine coal belongs to coal chemical industry and petrochemical technical field.
Background
The pulverized coal pyrolysis technology and the pulverized coal gasification technology are generally independently arranged, the currently reported pyrolysis and gasification integrated technology adopts a fluidized bed technology, the technology utilizes a solid heat carrier as a heat transfer carrier between gasification and pyrolysis, and the problems caused by the technology are that the separation of tar is difficult, a spiral separator is adopted for separation, the investment is large, and the efficiency is low. The traditional Fischer-Tropsch synthesis comprises two forms of slurry bed and fixed bed, which both need to operate under a larger circulation ratio, and the energy consumption of the device is higher.
Therefore, it has become an urgent technical problem in the art to provide a new system and method for processing pulverized coal.
SUMMERY OF THE UTILITY MODEL
In order to solve the above disadvantages and shortcomings, the present invention provides a pulverized coal processing system.
In order to achieve the above object, the present invention provides a pulverized coal processing system, wherein the pulverized coal processing system comprises a pulverized coal pyrolysis or pulverized coal gasification device, a tar hydrocracking device, and a fischer-tropsch synthesis device;
the pulverized coal pyrolysis or pulverized coal gasification device is at least provided with a raw material inlet, a gas outlet and a tar outlet;
the tar hydrocracking device is at least provided with a tar raw material inlet, a hydrogen inlet, an FT diesel raw material inlet, a low-gas-separation outlet and an impurity outlet containing sulfur and nitrogen;
the Fischer-Tropsch synthesis device is at least provided with a synthesis gas inlet and a FT diesel oil outlet;
the tar outlet of the pulverized coal pyrolysis or pulverized coal gasification device is connected with the tar raw material inlet of the tar hydrocracking device through a pipeline; the gas outlet of the pulverized coal pyrolysis or pulverized coal gasification device is connected with the synthesis gas inlet of the Fischer-Tropsch synthesis device through a pipeline; and an FT diesel oil outlet of the Fischer-Tropsch synthesis device is connected with an FT diesel oil raw material inlet of the tar hydrocracking device through a pipeline.
According to the specific embodiment of the present invention, preferably, the pulverized coal processing system further comprises a hydrogen production device at least comprising pressure swing adsorption equipment, the hydrogen production device is at least provided with a coal gas raw material inlet, a hydrogen gas outlet and an impurity outlet containing sulfur and nitrogen;
the gas outlet of the pulverized coal pyrolysis or pulverized coal gasification device is connected with the gas raw material inlet of the hydrogen production device through a pipeline; the hydrogen outlet of the hydrogen production device is connected with the hydrogen inlet of the tar hydrocracking device through a pipeline.
According to the utility model discloses specific embodiment, in this processing system of fine coal, hydrogen plant includes solitary pressure swing adsorption equipment, fine coal pyrolysis or fine coal gasification device's gas outlet pass through the pipeline with pressure swing adsorption equipment is connected, pressure swing adsorption equipment's purification back hydrogen exit linkage in tar hydrocracking unit's hydrogen entry.
According to the specific embodiment of the present invention, preferably, the pulverized coal processing system further comprises a sulfur recovery unit, wherein the sulfur recovery unit is provided with an impurity material inlet containing sulfur and nitrogen;
the sulfur and nitrogen-containing impurity outlet of the tar hydrocracking unit is connected with the sulfur and nitrogen-containing impurity raw material inlet of the sulfur recovery combined unit through a pipeline;
the sulfur and nitrogen-containing impurity outlet of the hydrogen production device is connected with the sulfur and nitrogen-containing impurity raw material inlet of the sulfur recovery combined device through a pipeline.
According to the utility model discloses specific embodiment, preferably, this processing system of fine coal still includes desulfurization, denitrification facility, and the gas outlet of fine coal pyrolysis or fine coal gasification facility is connected with this desulfurization, denitrification facility's gas inlet through the pipeline, and this desulfurization, denitrification facility's the impurity export that contains sulphur, nitrogen is connected with sulphur recovery unit's the impurity raw materials entry that contains sulphur, nitrogen through the pipeline, this desulfurization, denitrification facility's gas outlet through the pipeline with hydrogen plant's coal gas raw materials entry is connected.
Wherein, desulfurization, denitrification facility is the conventional equipment that uses in this field, in the utility model discloses the embodiment, this desulfurization, denitrification facility can be low temperature methyl alcohol processing apparatus or diethanolamine processing apparatus.
According to the specific embodiment of the present invention, in the pulverized coal processing system, the sulfur recovery unit can be provided with a plurality of sulfur and nitrogen containing impurity material inlets as required, and these inlets can be respectively marked as a first sulfur and nitrogen containing impurity material inlet, a second sulfur and nitrogen containing impurity material inlet, a third sulfur and nitrogen containing impurity material inlet, and so on;
wherein, the sulfur and nitrogen-containing impurity outlet of the tar hydrocracking unit is connected with a second sulfur and nitrogen-containing impurity raw material inlet of the sulfur recovery combined unit through a pipeline;
the sulfur and nitrogen-containing impurity outlet of the hydrogen production device is connected with the first sulfur and nitrogen-containing impurity raw material inlet of the sulfur recovery combined device through a pipeline;
and the sulfur and nitrogen-containing impurity outlet of the desulfurization and denitrification device is connected with a third sulfur and nitrogen-containing impurity raw material inlet of the sulfur recovery combined device through a pipeline.
According to the specific embodiment of the present invention, in the pulverized coal processing system, preferably, the low-pressure gas outlet of the tar hydrocracking unit is connected to the hydrogen raw material inlet of the hydrogen production unit through a pipeline.
According to the specific embodiment of the present invention, in the processing system of the pulverized coal, preferably, the industrial gas outlet of the fischer-tropsch synthesis device is connected to the hydrogen material inlet or the coal material inlet of the hydrogen production device through a pipeline.
According to the utility model discloses specific embodiment, in this processing system of fine coal, preferably, tar hydrocracking unit's diesel oil export is connected through pipeline and this tar hydrocracking unit's tar raw materials entry or FT diesel oil raw materials entry.
According to the specific embodiment of the present invention, in the processing system of pulverized coal, preferably, the tar hydrocracking unit is a suspension bed and/or a fixed bed hydrocracking unit.
According to the utility model discloses a specific embodiment, in this processing system of fine coal, preferably, the ft synthesis device is fixed bed ft synthesis reactor.
According to the utility model discloses in this processing system of fine coal, preferably, one or several in naphtha export, diesel oil export, the liquefied gas export of tar hydrocracking unit are connected with the raw materials entry of fine coal pyrolysis or fine coal gasification device through the pipeline to be the raw materials of fine coal pyrolysis or fine coal gasification device with one or several groups in naphtha, diesel oil, the liquefied gas.
According to the utility model discloses specific embodiment, in this processing system of fine coal, used fine coal pyrolysis or fine coal gasification equipment, tar hydrocracking unit (like the system that discloses in chinese patent application CN 101962571A), ft synthesizer, hydrogen plant and sulphur recovery integrated unit are the conventional equipment that uses in this field.
The utility model provides a this system of processing can also be used for processing and handle heavy oil of poor quality or organic solid waste material.
Powdered coal's processing system can be applicable to the method of multiple difference and carry out powdered coal processing, it is further right the utility model discloses a powdered coal's processing system explains, the utility model discloses an use is still provided the utility model discloses a powdered coal's processing system carries out the method of processing to powdered coal, the method includes following step:
(1) pyrolysis and/or gasification of pulverized coal: performing pyrolysis and/or gasification reaction on the pulverized coal to obtain at least pyrolysis gas, synthesis gas and tar;
(2) and (3) hydrocracking tar: hydrocracking the tar obtained in the step (1) to obtain products such as dry gas, naphtha, diesel oil and the like;
(3) Fischer-Tropsch synthesis: taking the pyrolysis gas and/or the synthesis gas obtained in the step (1) as a raw material, and obtaining products such as Fischer-Tropsch naphtha, Fischer-Tropsch diesel (FT diesel), liquefied gas, industrial gas and the like through Fischer-Tropsch synthesis;
Fischer-Tropsch diesel can also be used as the raw material for hydrocracking in the step (2).
According to the utility model discloses specific embodiment, in the above-mentioned method of processing fine coal, fine coal pyrolysis and gasification technique, tar hydrocracking technique and ft synthesis are present area conventional technical means, and the technical staff in the field can rationally set up the operating procedure and the technological parameter of these some technologies according to the field work needs.
According to a specific embodiment of the present invention, in the above method for processing pulverized coal, in the step (1), when only the pyrolysis reaction is performed on the pulverized coal, the reaction may be performed in the pulverized coal pyrolysis apparatus; when only gasification reaction is carried out on the pulverized coal, the reaction can be carried out in a pulverized coal gasification device; when the pyrolysis and gasification reaction is performed on the pulverized coal, the reaction may be performed in a pulverized coal pyrolysis and gasification integrated reaction furnace (a conventional apparatus used in the art); of course, when only the pulverized coal is subjected to the pyrolysis or gasification reaction, the reaction may be performed in the integrated pyrolysis and gasification reaction furnace for the pulverized coal.
In the step (1), the pulverized coal pyrolysis and gasification integrated process carried out in the pulverized coal pyrolysis and gasification integrated reaction furnace is an innovative process technology in the field, the gas raw materials are widely selected, the coal quality classification utilization can be realized, and more raw materials can be provided for subsequent processing.
According to the utility model discloses specific embodiment, above-mentioned method of processing fine coal still includes:
and (2) sending the pyrolysis gas and/or the synthesis gas obtained in the step (1) to a desulfurization and denitrification device to carry out desulfurization and denitrification treatment on the pyrolysis gas and/or the synthesis gas, sending the gas obtained after desulfurization and denitrification treatment to a hydrogen production device to be used as a hydrogen production raw material, and sending impurities containing sulfur and nitrogen obtained after desulfurization and denitrification treatment to a sulfur recovery combined device to recover and obtain sulfur and liquid ammonia products.
According to the specific embodiment of the present invention, in the above method for processing pulverized coal, a suspension bed hydrocracking process (such as the process disclosed in chinese patent application CN 101962571A) may be adopted in step (2), a suitable fraction may also be selected and processed by a fixed bed hydrocracking process, and of course, a combined processing technique of a suspension bed and a fixed bed may also be adopted. And all or part of the diesel products (including heavy diesel products and/or light diesel products) obtained in the step (2) can be recycled in hydrocracking, and in addition, the distribution of the products can be adjusted according to market demands by adopting a mode of adjusting the diesel circulation amount in the step (2), so that the diesel oil or naphtha can be produced in a large amount.
According to the utility model discloses a specific embodiment, in above-mentioned method of processing fine coal, in step (3), the Fischer-Tropsch synthesis can select fixed bed cobalt base catalyst Fischer-Tropsch synthesis technique, takes once through the flow, does not require the too high oil yield of Fischer-Tropsch synthesis, and oil product and industrial gas product are obtained through the separation to the reaction resultant; the technological process scheme is suitable for being distributed in chemical industrial park, and the industrial fuel gas has methane, CO and hydrogen as main components and may be used as fuel for other enterprises.
According to the utility model discloses specific embodiment, in above-mentioned method of processing fine coal, in step (3), wherein, methane in pyrolysis gas and/or the synthetic gas directly gets into the ft synthesizer through not separating, and unreacted synthetic gas and methane use as the industrial gas.
According to the utility model discloses a specific embodiment, in above-mentioned method of processing fine coal, in step (3), when only carrying out the pyrolysis gas that obtains in step (1) as the raw materials when FT synthesis, the output of FT diesel oil can reduce by a wide margin, can reconcile this FT diesel oil that obtains in step (3) and the diesel oil fraction that obtains in step (2) this moment, obtains the diesel oil product.
According to the utility model discloses specific embodiment, above-mentioned method of processing fine coal still includes:
and (3) carrying out Pressure Swing Adsorption (PSA) on pyrolysis gas and synthesis gas obtained by integrating pyrolysis and gasification of the pulverized coal in the step (1) and/or low-component gas obtained by hydrocracking in the step (2) and/or tail gas (namely industrial gas) obtained by Fischer-Tropsch synthesis in the step (3) to extract hydrogen as hydrogen required by hydrocracking in the step (2).
The technology for purifying hydrogen by pressure swing adsorption is a conventional technology in the field, and the specific operation steps are not described in detail in the text.
According to the utility model discloses specific embodiment, above-mentioned method of processing fine coal still includes:
carrying out pyrolysis on the pulverized coal obtained in the step (1) and/or gasifying the pulverized coal to obtain pyrolysis gas and/or impurities containing sulfur and nitrogen obtained after hydrogen is produced as a raw material, and obtaining sulfur and liquid ammonia products through a sulfur recovery combined device; and/or the sulfur and liquid ammonia products are obtained from the impurities containing sulfur and nitrogen obtained after hydrocracking in the step (2) through a sulfur recovery integrated device.
The sulphur recovery unit may be a sulphur recovery unit as is conventional in the art. The utility model discloses in, the part that impurity such as sulphur, nitrogen in the raw materials fine coal got into tar converts in tar hydrocracking technology, and the part that gets into pyrolysis gas separates in purifying the technology, then all can make sulphur and liquid ammonia product through sulphur recovery combination unit, has both increased economic value, has reduced environmental pollution again.
The utility model provides a this processing route to the method that fine coal was processed includes: the main products of the process comprise diesel oil, naphtha, liquefied gas, industrial gas and the like. Raw materials and products are mutually supplied among all processes in the processing flow, the Fischer-Tropsch diesel and the hydrogenated diesel can be blended into the vehicle diesel meeting the national VI standard, the Fischer-Tropsch naphtha is a high-quality ethylene cracking raw material, the hydrogenated naphtha is a high-quality reforming raw material, the Fischer-Tropsch synthesis device can be set to circulate or pass through the flow once, the energy consumption can be greatly reduced through the flow once, the industrial gas has a better market for sale in a chemical industry park, and the overall benefit of pulverized coal processing is improved. The utility model provides a traditional fine coal processing mode is broken to this method to step (1) has proposed the new method of fine coal processing for technical core, and the processing means is nimble, and the distribution of each product can be allocated in a flexible way according to market needs: the production of diesel oil, naphtha and industrial gas can be realized by a simpler means.
The utility model provides an among the processing system of fine coal, the material is supplied mutually between each device, realizes combining organically, and has all realized the optimization of the processing cost and the income of various materials.
To sum up, the utility model provides a high added value products such as diesel oil, petrol mediation component, naphtha, liquefied gas, industrial gas can be produced to the system and method of processing of fine coal, for the present fine coal gasification technique in this field, tar has preferentially been extracted out to this method, has realized that fine coal divides the matter to utilize in grades, has promoted product value, according to market needs, can carry out nimble distribution to the product, is a neotype and uses fine coal as the integration processing method and the system of raw materials production oil and industrial gas.
Drawings
Fig. 1 is a schematic structural diagram of a pulverized coal processing system provided in embodiment 1 of the present invention.
The main reference numbers illustrate:
1. a pulverized coal pyrolysis or pulverized coal gasification unit;
11. a raw material inlet; 12. a gas outlet; 13. a tar outlet;
2. a tar hydrocracking unit;
21. a tar feedstock inlet; 22. a hydrogen inlet; 23. an FT diesel feedstock inlet; 24. an industrial gas outlet; 25. a naphtha outlet; 26. a diesel oil outlet; 27. a low-pressure gas outlet; 28. an impurity outlet containing sulfur and nitrogen;
3. a Fischer-Tropsch synthesis unit;
31. a syngas inlet; 32. an industrial gas outlet; 33. naphtha product outlet, 34 and FT diesel oil outlet
4. A hydrogen production plant comprising at least a pressure swing adsorption apparatus;
41. a coal gas raw material inlet; 42. a hydrogen feed inlet; 43. a hydrogen outlet; 44. an impurity outlet containing sulfur and nitrogen;
5. a sulfur recovery unit;
51. a first sulfur and nitrogen containing contaminant feed inlet; 52. a second sulfur and nitrogen containing contaminant feed inlet; 53. a sulfur outlet; 54. and a liquid ammonia outlet.
Detailed Description
The following detailed description of the embodiments and the advantageous effects thereof will be provided by way of specific examples and accompanying drawings, which are provided to assist the reader in better understanding the nature and features of the present invention, and are not intended to limit the scope of the present invention.
Example 1
The present embodiment provides a processing system of pulverized coal, wherein a schematic structural diagram of the processing system of pulverized coal is shown in fig. 1, and as can be seen from fig. 1, the processing system of pulverized coal includes:
a pulverized coal pyrolysis or pulverized coal gasification device (which can be an integrated reaction furnace for pulverized coal pyrolysis and gasification in the embodiment) 1, a tar hydrocracking device 2, a fischer-tropsch synthesis device 3, a hydrogen production device 4 at least comprising pressure swing adsorption equipment, and a sulfur recovery combined device 5;
the pulverized coal pyrolysis or pulverized coal gasification device 1 is provided with a raw material inlet 11, a gas outlet 12 and a tar outlet 13;
the tar hydrocracking device 2 is provided with a tar raw material inlet 21, a hydrogen inlet 22, an FT diesel raw material inlet 23, an industrial gas outlet 24, a naphtha outlet 25, a diesel oil outlet 26, a low-gas-fraction outlet 27 and an impurity outlet 28 containing sulfur and nitrogen;
the Fischer-Tropsch synthesis device 3 is provided with a synthesis gas inlet 31, an industrial gas outlet 32, a naphtha product outlet 33 and a FT diesel oil outlet 34;
the hydrogen production device 4 is provided with a coal gas raw material inlet 41, a hydrogen raw material inlet 42, a hydrogen outlet 43 and an impurity outlet 44 containing sulfur and nitrogen;
the sulfur recovery combination unit 5 is provided with a first sulfur and nitrogen-containing impurity raw material inlet 51, a second sulfur and nitrogen-containing impurity raw material inlet 52, a sulfur outlet 53 and a liquid ammonia outlet 54;
the tar outlet 13 of the pulverized coal pyrolysis or pulverized coal gasification device 1 is connected with the tar raw material inlet 21 of the tar hydrocracking device 2 through a pipeline; the gas outlet 12 of the pulverized coal pyrolysis or pulverized coal gasification device 1 is connected with the synthetic gas inlet 31 of the Fischer-Tropsch synthesis device 3 through a pipeline; the FT diesel outlet 34 of the Fischer-Tropsch synthesis device 3 is connected with the FT diesel raw material inlet 23 of the tar hydrocracking device 2 through a pipeline;
the gas outlet 12 of the pulverized coal pyrolysis or pulverized coal gasification device 1 is connected with the coal gas raw material inlet 41 of the hydrogen production device 4 through a pipeline; the hydrogen outlet 43 of the hydrogen production device 4 is connected with the hydrogen inlet 22 of the tar hydrocracking device 2 through a pipeline;
the sulfur and nitrogen-containing impurity outlet 28 of the tar hydrocracking unit 2 is connected with a second sulfur and nitrogen-containing impurity raw material inlet 52 of the sulfur recovery integrated unit 5 through a pipeline;
the sulfur and nitrogen-containing impurity outlet 44 of the hydrogen production device 4 is connected with the first sulfur and nitrogen-containing impurity raw material inlet 51 of the sulfur recovery combined device 5 through a pipeline;
the low-gas-fraction outlet 27 of the tar hydrocracking device 2 is connected with the hydrogen raw material inlet 42 of the hydrogen production device 4 through a pipeline.
In this embodiment, one or more of the naphtha outlet 25, the diesel outlet 26, and the liquefied gas outlet (not shown) of the tar hydrocracking apparatus 2 are connected to the raw material inlet of the pulverized coal pyrolysis or pulverized coal gasification apparatus 1 through a pipeline.
In this embodiment, the tar hydrocracking apparatus 2 may be a suspension bed and/or a fixed bed hydrocracking apparatus.
In this embodiment, the fischer-tropsch synthesis unit 3 may be a fixed bed fischer-tropsch synthesis reactor.
Example 2
The present embodiment provides a processing system of pulverized coal, wherein a schematic structural diagram of the processing system of pulverized coal is shown in fig. 1, and as can be seen from fig. 1, the processing system of pulverized coal includes:
a pulverized coal pyrolysis or pulverized coal gasification device (which can be an integrated reaction furnace for pulverized coal pyrolysis and gasification in the embodiment) 1, a tar hydrocracking device 2, a fischer-tropsch synthesis device 3, a hydrogen production device 4 at least comprising pressure swing adsorption equipment, a desulfurization and denitrification device (not shown in the figure) and a sulfur recovery combined device 5;
the pulverized coal pyrolysis or pulverized coal gasification device 1 is provided with a raw material inlet 11, a gas outlet 12 and a tar outlet 13;
the tar hydrocracking device 2 is provided with a tar raw material inlet 21, a hydrogen inlet 22, an FT diesel raw material inlet 23, an industrial gas outlet 24, a naphtha outlet 25, a diesel oil outlet 26, a low-gas-fraction outlet 27 and an impurity outlet 28 containing sulfur and nitrogen;
the Fischer-Tropsch synthesis device 3 is provided with a synthesis gas inlet 31, an industrial gas outlet 32, a naphtha product outlet 33 and a FT diesel oil outlet 34;
the hydrogen production device 4 is provided with a coal gas raw material inlet 41, a hydrogen raw material inlet 42, a hydrogen outlet 43 and an impurity outlet 44 containing sulfur and nitrogen;
the sulfur recovery combined device 5 is provided with a first sulfur and nitrogen-containing impurity raw material inlet 51, a second sulfur and nitrogen-containing impurity raw material inlet 52, a third sulfur and nitrogen-containing impurity raw material inlet, a sulfur outlet 53 and a liquid ammonia outlet 54;
the tar outlet 13 of the pulverized coal pyrolysis or pulverized coal gasification device 1 is connected with the tar raw material inlet 21 of the tar hydrocracking device 2 through a pipeline; the gas outlet 12 of the pulverized coal pyrolysis or pulverized coal gasification device 1 is connected with the synthetic gas inlet 31 of the Fischer-Tropsch synthesis device 3 through a pipeline; the FT diesel outlet 34 of the Fischer-Tropsch synthesis device 3 is connected with the FT diesel raw material inlet 23 of the tar hydrocracking device 2 through a pipeline;
the gas outlet 12 of the pulverized coal pyrolysis or pulverized coal gasification device 1 is connected with the coal gas raw material inlet 41 of the hydrogen production device 4 through a pipeline; the hydrogen outlet 43 of the hydrogen production device 4 is connected with the hydrogen inlet 22 of the tar hydrocracking device 2 through a pipeline;
the sulfur and nitrogen-containing impurity outlet 28 of the tar hydrocracking unit 2 is connected with a second sulfur and nitrogen-containing impurity raw material inlet 52 of the sulfur recovery integrated unit 5 through a pipeline;
the sulfur and nitrogen-containing impurity outlet 44 of the hydrogen production device 4 is connected with the first sulfur and nitrogen-containing impurity raw material inlet 51 of the sulfur recovery combined device 5 through a pipeline;
the low-gas-content outlet 27 of the tar hydrocracking device 2 is connected with the hydrogen raw material inlet 42 of the hydrogen production device 4 through a pipeline;
the gas outlet 12 of the pulverized coal pyrolysis or pulverized coal gasification device 1 is connected with the gas inlet of the desulfurization and denitrification device through a pipeline, the sulfur and nitrogen containing impurity outlet of the desulfurization and denitrification device is connected with the third sulfur and nitrogen containing impurity raw material inlet of the sulfur recovery combined device 5 through a pipeline, and the gas outlet of the desulfurization and denitrification device is connected with the gas raw material inlet 41 of the hydrogen production device 4 through a pipeline.
In this embodiment, the industrial gas outlet 32 of the fischer-tropsch synthesis device 3 is connected to the hydrogen raw material inlet 42 or the coal gas raw material inlet 41 of the hydrogen production device 4 through a pipeline.
In this embodiment, the diesel outlet 26 of the tar hydrocracking apparatus 2 is connected to the tar feedstock inlet 21 or the FT diesel feedstock inlet 23 of the tar hydrocracking apparatus 2 via a pipeline.
In this embodiment, one or more of the naphtha outlet 25, the diesel outlet 26, and the liquefied gas outlet (not shown) of the tar hydrocracking apparatus 2 are connected to the raw material inlet of the pulverized coal pyrolysis or pulverized coal gasification apparatus 1 through a pipeline.
Example 3
The embodiment provides a method for processing pulverized coal, which is implemented by using the system for processing pulverized coal provided in embodiment 1 or embodiment 2, wherein the method comprises the following steps:
(1) pyrolysis and/or gasification of pulverized coal: performing pyrolysis and/or gasification reaction on the pulverized coal to obtain at least pyrolysis gas, synthesis gas and tar;
(2) and (3) hydrocracking tar: hydrocracking the tar obtained in the step (1) to obtain a product containing dry gas, low-grade gas, naphtha and diesel oil;
(3) Fischer-Tropsch synthesis: taking the pyrolysis gas and/or the synthesis gas obtained in the step (1) as a raw material, and obtaining products such as Fischer-Tropsch naphtha, Fischer-Tropsch diesel oil, liquefied gas, industrial gas and the like through Fischer-Tropsch synthesis; Fischer-Tropsch diesel can also be used as the raw material for the tar hydrocracking in the step (2).
In the processing method of the pulverized coal, the pulverized coal can be subjected to pyrolysis and/or gasification reaction in the pulverized coal pyrolysis and gasification integrated reaction furnace in the step (1), the adopted pulverized coal pyrolysis and gasification integrated process is an innovative process technology in the field, the raw materials are widely selected, the added value of products is high, and more raw materials can be provided for subsequent processing. The raw material of the step (1) can be one or a mixture of more of pulverized coal, inferior heavy oil and organic solid waste, and is more prone to feeding the pulverized coal; the step (1) can adopt the conventional coal dry distillation and/or coal gasification process in the field, preferably adopts the process with higher coal tar yield, and can provide more raw materials for subsequent processing.
In the above-mentioned powdered coal processing method, in step (2), a suspension bed hydrocracking process (such as the process disclosed in chinese patent application CN 101962571A) may be adopted, or a fixed bed hydrocracking process may be adopted to process the selected suitable fraction, or a combined suspension bed and fixed bed processing technique may be adopted. And all or part of the heavy diesel oil product and/or the light diesel oil product obtained in the step (2) can be recycled in hydrocracking, and in addition, the product distribution can be adjusted according to market requirements by adjusting the circulation amount of the diesel oil in the step (2), so that the diesel oil or naphtha can be produced in a large amount.
In the method for processing the pulverized coal, in the step (3), a fixed bed cobalt-based catalyst Fischer-Tropsch synthesis technology can be selected for Fischer-Tropsch synthesis, a one-time pass process is adopted, the Fischer-Tropsch synthesis is not required to have high oil product yield, and the products obtained by the reaction are separated to obtain oil products and industrial gas products; the technological process scheme is suitable for being distributed in chemical industrial park, and the industrial fuel gas has methane, CO and hydrogen as main components and may be used as fuel for other enterprises.
The method for processing the pulverized coal can further comprise the step (4):
and (3) purifying the hydrogen-rich gas product obtained in the step (1) and/or the step (2) and/or the step (3) by Pressure Swing Adsorption (PSA) to obtain hydrogen required by hydrocracking in the step (2). If the hydrogen quantity can not meet the requirement of the step (2), the hydrogen can be produced by taking coal gas obtained by coal dry distillation or coal gasification and/or natural gas and/or methanol as raw materials to supplement the step (2).
Among them, the pressure swing adsorption technology for purifying hydrogen is a conventional technology in the art, and for example, the pressure swing adsorption technology disclosed in chinese patent application CN1355131A can be used in this embodiment.
The method for processing pulverized coal may further include:
taking pyrolysis gas obtained by pyrolyzing or gasifying the pulverized coal in the step (1) as a raw material to produce hydrogen to obtain sulfur and nitrogen-containing impurities, and obtaining sulfur and liquid ammonia products through a sulfur recovery combination device; and/or hydrocracking the tar obtained in the step (2) to obtain sulfur and nitrogen-containing impurities, and obtaining sulfur and liquid ammonia products through a sulfur recovery combined device.
The sulphur recovery unit may be a sulphur recovery unit as is conventional in the art. For example, in this embodiment, the SWSR-1 sulfur recovery device disclosed in Chinese patent application CN103482583A can be used.
The utility model discloses in, the part that impurity such as sulphur, nitrogen in the raw materials fine coal got into tar converts in tar hydrocracking technology, and the part that gets into pyrolysis gas separates in hydrogen manufacturing technology, then all can make sulphur and liquid ammonia product through sulphur recovery combination unit, has both increased economic value, has reduced environmental pollution again.
The utility model provides a processing route of powdered coal's processing method includes technologies such as powdered coal pyrolysis gasification integration, tar hydrocracking, ft synthesis, and the main product includes diesel oil, naphtha, liquefied gas, industry gas etc.. Raw materials and products are mutually supplied among the processes in the processing flow, organic combination is realized, and the processing cost and the benefit of various materials are optimized. The utility model discloses a processing method that provides has broken traditional fine coal processing mode to step (1) has proposed the new method of fine coal processing for the technical core, has realized fine coal and has divided the hierarchical utilization of matter, and the processing means is nimble, and the distribution of each product can be allocated in a flexible way according to market needs: the production of diesel oil, naphtha and industrial gas can be realized by a simpler means.
The technical solution of the present invention will be described in detail with reference to a specific embodiment. The following detailed description uses the system of example 1 and the method of example 2.
Specifically, the pulverized coal pyrolysis and gasification adopt a pulverized coal pyrolysis and gasification integrated technology, the tar hydrocracking adopts a suspension bed hydrocracking process technology, and the Fischer-Tropsch synthesis adopts a fixed bed cobalt-based catalyst process technology.
Pulverized coal is used as a raw material, and tar, pyrolysis gas and synthesis gas are obtained through pulverized coal pyrolysis and gasification. The tar is used as the raw material for hydrocracking in the suspension bed, and the main products of the tar hydrocracking device comprise naphtha and diesel oil. The naphtha is sold as a high-quality reforming raw material, and the diesel oil and the Fischer-Tropsch diesel oil are blended into the vehicle diesel oil meeting the national VI standard for sale.
Because the impurity content in the tar is high, the carbon-hydrogen ratio is high, and a large amount of hydrogen needs to be consumed, the hydrogen produced by the embodiment can meet the requirement of hydrocracking.
The final products of the whole processing route are diesel oil, naphtha, liquefied gas and industrial gas products.
Wherein the properties of the diesel product, the hydrogenated naphtha product and the Fischer-Tropsch naphtha product are shown in tables 1-3 below.
TABLE 1
TABLE 2
TABLE 3
Therefore, the system and the method for processing the pulverized coal can produce high-added-value products such as diesel oil, naphtha, liquefied gas, industrial gas and the like, and compared with the existing pulverized coal gasification technology in the field, the method preferentially extracts tar, realizes the quality-based graded utilization of the pulverized coal, and improves the product value; meanwhile, products can be flexibly distributed according to market demands, and the integrated processing line and system for pulverized coal pyrolysis and gasification are novel.
The above description is only for the specific embodiments of the present invention, and the scope of the present invention can not be limited by the embodiments, so that the replacement of the equivalent components or the equivalent changes and modifications made according to the protection scope of the present invention should still belong to the scope covered by the present patent.
Claims (10)
1. The processing system of the pulverized coal is characterized by comprising a pulverized coal pyrolysis or pulverized coal gasification device (1), a tar hydrocracking device (2) and a Fischer-Tropsch synthesis device (3);
the pulverized coal pyrolysis or gasification device (1) is at least provided with a raw material inlet (11), a gas outlet (12) and a tar outlet (13);
the tar hydrocracking device (2) is at least provided with a tar raw material inlet (21), a hydrogen inlet (22), an FT diesel raw material inlet (23), a low-gas-content outlet (27) and an impurity outlet (28) containing sulfur and nitrogen;
the Fischer-Tropsch synthesis device (3) is at least provided with a synthesis gas inlet (31) and an FT diesel outlet (34);
a tar outlet (13) of the pulverized coal pyrolysis or pulverized coal gasification device (1) is connected with a tar raw material inlet (21) of the tar hydrocracking device (2) through a pipeline; the gas outlet (12) of the pulverized coal pyrolysis or pulverized coal gasification device (1) is connected with the synthetic gas inlet (31) of the Fischer-Tropsch synthesis device (3) through a pipeline; and an FT diesel oil outlet (34) of the Fischer-Tropsch synthesis device (3) is connected with an FT diesel oil raw material inlet (23) of the tar hydrocracking device (2) through a pipeline.
2. The pulverized coal processing system according to claim 1, further comprising a hydrogen production device (4) at least comprising a pressure swing adsorption device, wherein the hydrogen production device (4) is at least provided with a coal gas raw material inlet (41), a hydrogen gas raw material inlet (42), a hydrogen gas outlet (43) and an impurity outlet (44) containing sulfur and nitrogen;
a gas outlet (12) of the pulverized coal pyrolysis or pulverized coal gasification device (1) is connected with a coal gas raw material inlet (41) of the hydrogen production device (4) through a pipeline; the hydrogen outlet (43) of the hydrogen production device (4) is connected with the hydrogen inlet (22) of the tar hydrocracking device (2) through a pipeline.
3. The pulverized coal processing system as claimed in claim 2, further comprising a sulfur recovery unit (5), wherein the sulfur recovery unit (5) is provided with an inlet for sulfur-and nitrogen-containing impurity material;
the sulfur and nitrogen-containing impurity outlet (28) of the tar hydrocracking device (2) is connected with the sulfur and nitrogen-containing impurity raw material inlet of the sulfur recovery combined device (5) through a pipeline;
the sulfur and nitrogen-containing impurity outlet (44) of the hydrogen production device (4) is connected with the sulfur and nitrogen-containing impurity raw material inlet of the sulfur recovery combined device (5) through a pipeline.
4. The pulverized coal processing system as claimed in claim 3, characterized in that the system further comprises a desulfurization and denitrification device, wherein the gas outlet (12) of the pulverized coal pyrolysis or pulverized coal gasification device (1) is connected with the gas inlet of the desulfurization and denitrification device through a pipeline, the sulfur and nitrogen-containing impurity outlet of the desulfurization and denitrification device is connected with the sulfur and nitrogen-containing impurity raw material inlet of the sulfur recovery combination device (5) through a pipeline, and the gas outlet of the desulfurization and denitrification device is connected with the gas raw material inlet (41) of the hydrogen production device (4) through a pipeline.
5. The pulverized coal processing system according to any one of claims 2 to 4, wherein the low-fraction gas outlet (27) of the tar hydrocracking unit (2) is connected to the hydrogen raw material inlet (42) of the hydrogen production unit (4) through a pipeline.
6. The pulverized coal processing system according to any one of claims 2 to 4, wherein the industrial gas outlet (32) of the Fischer-Tropsch synthesis unit (3) is connected to the hydrogen raw material inlet (42) or the gas raw material inlet (41) of the hydrogen production unit (4) through a pipeline.
7. The pulverized coal processing system according to any one of claims 1 to 4, wherein the diesel outlet (26) of the tar hydrocracking unit (2) is connected to the tar feedstock inlet (21) or the FT diesel feedstock inlet (23) of the tar hydrocracking unit (2) by a pipeline.
8. The pulverized coal processing system according to any one of claims 1 to 4, characterized in that the tar hydrocracking unit (2) is a suspended bed and/or a fixed bed hydrocracking unit.
9. The pulverized coal processing system according to any one of claims 1 to 4, wherein the Fischer-Tropsch synthesis unit (3) is a fixed bed Fischer-Tropsch synthesis reactor.
10. The pulverized coal processing system according to any one of claims 1 to 4, wherein one or more of the naphtha outlet, the diesel outlet, and the liquefied gas outlet of the tar hydrocracking unit (2) are connected to the raw material inlet of the pulverized coal pyrolysis or pulverized coal gasification unit (1) through a pipeline.
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