CN111234884A - Absorption of CO in pyrolysis gas by calcium-based absorbent2And control method thereof - Google Patents
Absorption of CO in pyrolysis gas by calcium-based absorbent2And control method thereof Download PDFInfo
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- 238000000197 pyrolysis Methods 0.000 title claims abstract description 65
- 239000011575 calcium Substances 0.000 title claims abstract description 50
- 229910052791 calcium Inorganic materials 0.000 title claims abstract description 50
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000010521 absorption reaction Methods 0.000 title claims description 9
- 239000002250 absorbent Substances 0.000 claims abstract description 64
- 230000002745 absorbent Effects 0.000 claims abstract description 49
- 238000012360 testing method Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 23
- 239000002245 particle Substances 0.000 claims abstract description 21
- 230000009471 action Effects 0.000 claims description 8
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 4
- 239000002594 sorbent Substances 0.000 claims description 3
- 230000011664 signaling Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 56
- 229910002092 carbon dioxide Inorganic materials 0.000 description 37
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 16
- 239000003463 adsorbent Substances 0.000 description 12
- 239000001569 carbon dioxide Substances 0.000 description 7
- 125000000524 functional group Chemical group 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- 238000000862 absorption spectrum Methods 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 238000004566 IR spectroscopy Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001833 catalytic reforming Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical class [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/002—Removal of contaminants
- C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
- C10K1/005—Carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/30—Controlling by gas-analysis apparatus
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/62—Carbon oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/20—Purifying combustible gases containing carbon monoxide by treating with solids; Regenerating spent purifying masses
- C10K1/205—Methods and apparatus for treating the purifying masses without their regeneration
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
- C10K1/00—Purifying combustible gases containing carbon monoxide
- C10K1/20—Purifying combustible gases containing carbon monoxide by treating with solids; Regenerating spent purifying masses
- C10K1/22—Apparatus, e.g. dry box purifiers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The invention discloses a method for absorbing CO in pyrolysis gas by using a calcium-based absorbent2The system comprises a front end inlet pipeline, a gas flow control device, CO which are connected in sequence2The content testing device, the middle pipeline and the rear end outlet pipeline; the system also includes a process controller, which is separately connected to the CO2The content testing device is connected with the middle pipeline; the middle pipeline comprises a plurality of branch pipelines, a valve is arranged at the pipeline opening of each branch pipeline, and a calcium-based absorbent is arranged in each branch pipeline; the process controller receives the CO2CO emitted by content testing device2Content signal and control of corresponding branch pipeA valve in the way. The system has the advantages of prolonging the service life of the absorbent (especially the absorbent with high price and small particle size), and treating CO2The pyrolysis gas with wider content range, more stable product quality and the system can replace the absorbent without stopping working.
Description
Technical Field
The invention relates to the technical field of industrial process control, in particular to a pipeline system for absorbing carbon dioxide in pyrolysis gas by using a calcium-based absorbent and a control method.
Background
The process of recycling solid waste by thermal utilization is generally: heating organic solid waste in inert atmosphere to generate high-temperature pyrolysis gas, performing catalytic reforming on the high-temperature pyrolysis gas to generate pyrolysis gas, wherein the main components of the pyrolysis gas comprise CO and H2、CH4、CO2Nitrogen compounds and sulfur compounds; the pyrolysis gas is subjected to desulfurization, denitrification and CO removal2And then would be the ideal gaseous fuel.
The difficulty of the ideal gas fuel from pyrolysis gas is how to efficiently catalyze reforming, denitrogenation and desulfurization, and remove CO2. CO remaining in pyrolysis gas2Will reduce the heating value thereof and directly discharge CO2The greenhouse effect and the climate are aggravated; thus removing CO from the pyrolysis gas2Is necessary. The invention aims to remove CO from pyrolysis gas2This technical problem.
In industrial production, a calcium-based circulating absorbent is often selected to remove CO2The main chemical equation in one cycle of the working process is as follows:
however, as the number of cycles increases, the absorbent sinters, resulting in a decrease in the effective surface area and a significant decrease in the absorbent capacity. Therefore, extending the useful life of the absorbent is an important research topic. At present, the main idea is to chemically modify CaO or add other components to the absorbent to improve the life of the absorbent. From the aspect of industrial process control, the invention provides an optimized pipeline system, and a reasonable control method is matched to prolong the service life of the absorbent.
Experiments prove that the significance of the influence factors of the adsorption capacity of the calcium-based adsorbent is as follows from large to small: mixed gas flow, carbon dioxide content, carbonation temperature, adsorbent particle size. When the content of carbon dioxide in the pyrolysis gas is higher, the carbon dioxide can carbonate the adsorbent quickly, namely the capacity of the adsorbent with larger particle size for treating the pyrolysis gas with high content of carbon dioxide is equivalent to that of the adsorbent with small particle size. When the content of carbon dioxide in the pyrolysis gas is lower, the absorption capacity of the small-particle-size adsorbent is stronger than that of the large-particle-size adsorbent. Therefore, if CO is required in the product2The content is stable, the small-particle-size adsorbent is consumed as little as possible, and the low-content CO is treated by only the small-particle-size adsorbent2And (4) pyrolyzing gas. In the present invention, the pyrolysis gas temperature is assumed to be 600-.
The infrared absorption spectrum of a molecule can reflect the functional group or chemical bond type of the molecule so as to infer the molecular formula; for a mixture of simple molecular compositions, if there is little overlap between the characteristic peaks of the functional groups (i.e., the difference in the characteristic wave numbers between the functional groups is large) and the characteristic peaks have sufficient intensity, and the number of the molecules is not so small, the mixture can also be quantitatively analyzed by infrared absorption spectroscopy.
After the pyrolysis gas is desulfurized and denitrified, the main components are as follows: CO, H2、CH4、CO2. The characteristic functional groups or chemical bonds existing in each molecule in the known pyrolysis gas; they are predominantly (characteristic wave number/cm in parentheses)-1): carbon-oxygen triple bond (2150), hydrogen-hydrogen single bond (no absorption peak in middle infrared region), carbon-hydrogen single bond (2913.0, 1533.3, 3018.9, 1305.9), and carbon-oxygen double bond (2349, 1340, 667). The characteristic peaks of the main characteristic functional groups or chemical bonds are greatly different, so that the CO in the pyrolysis gas is detected by infrared absorption spectrum2The content provides the possibility.
In the invention, a Fourier transform infrared spectrometer is adopted; the infrared spectrometer has the advantages of short scanning interval and high signal-to-noise ratio, and can meet the requirement of monitoring the content change of pyrolysis gas components in real time with high precision.
Disclosure of Invention
The invention aims to provide a new idea for removing CO in pyrolysis gas by using a calcium-based circulating absorbent2The problem of how to prolong the service life of the calcium-based circulating absorbent in application. The common idea is absorbent modification, but the invention adopts an industrial process control method, provides an optimized pipeline system, and is matched with a reasonable control method to prolong the service life of the absorbent and treat CO2The content range is wider.
The purpose of the invention is realized by one of the following technical schemes.
The invention provides a method for absorbing CO in pyrolysis gas by using a calcium-based absorbent2The system comprises a front end inlet pipeline, a gas flow control device and CO which are sequentially connected2The content testing device, the middle pipeline and the rear end outlet pipeline; the system also includes a process controller, which is separately connected to the CO2The content testing device is connected with the intermediate pipeline; the middle pipeline comprises a plurality of branch pipelines, a valve is arranged at the pipeline opening of each branch pipeline, and a calcium-based absorbent is arranged in each branch pipeline; the process controller receives the CO2CO emitted by content testing device2The content signal controls the valve on the corresponding branch pipeline.
Preferably, CO2The content testing device is a Fourier transform infrared spectrometer.
Preferably, the calcium-based sorbent is distributed in the middle of the branch conduit.
Preferably, the intermediate conduit comprises 4-6 branch conduits.
Preferably, the particle size differs between the calcium-based absorbents in each branch conduit.
Preferably, the particle size between the calcium-based absorbents in each branch pipe is in a gradient distribution.
Preferably, when the pyrolysis gas flow is 50-70ml/min and the working temperature is 600-700 ℃, CO2The volume content is (6%,10%]、(10％,14％]、(14％,18％]、(18％,22％]The particle size ranges of the calcium-based absorbent corresponding to the pyrolysis gas are respectively (75 μm and 120 μm)]、(120μm,180μm]、(180μm,250μm]、 (250μm,380μm]。
Preferably, the process controllers are each separately associated with the CO2The content testing device is connected with the middle pipeline through a lead.
Preferably, the process controller comprises a signal processor for receiving the CO and a digital power supply2CO emitted by content testing device2The content signal outputs a valve switch signal, and the digital power supply receives the valve switch signal through a lead and controls the valve switch action of the corresponding branch pipeline.
The invention also provides a method for controlling the absorption of CO in the pyrolysis gas by using the calcium-based absorbent2The method of (1), comprising the steps of:
(1) setting CO to each branch pipe of the process controller and the intermediate pipe2Interval of content according to CO2In the content interval, calcium-based absorbent is arranged in each branch pipeline of the middle pipeline;
(2) the pyrolysis gas is introduced into a front inlet pipeline, passes through the front inlet pipeline, is subjected to flow control by a gas flow control device, and then enters CO2Content testing device to obtain CO2Content (c);
(3) the processing controller receives the CO transmitted in the step (2)2A content signal, and CO preset in step (1)2Comparing the content areas to obtain a valve switching signal, and controlling the valve switching action of the corresponding branch pipeline by the processing controller according to the valve switching signal;
(4) the pyrolysis gas flows through a branch pipeline which is opened by a valve, and the calcium-based absorbent in the branch pipeline removes CO in the pyrolysis gas2Removal of CO2The pyrolysis gas is discharged through a rear end outlet pipeline.
Preferably, the pyrolysis gas is one that has been desulfurized and denitrified.
Compared with the prior art, the invention has the following beneficial effects and advantages:
(1) the invention prolongs the service life of the absorbent (especially the absorbent with small particle size and higher price)The provided system can select the optimal CO according to the carbon dioxide content of the pyrolysis gas in the pipeline2And adjusting the particle size of the absorbent, and adjusting different gas guide paths of the pyrolysis gas through the middle pipeline to ensure that the gas passes through the absorbent with the optimal particle size. When the Fourier transform infrared spectrometer detects low CO2When the content is higher, the absorbent with smaller grain diameter with higher price is selected; thus, the design effect of reasonably and efficiently utilizing the absorbent is achieved, and the service life of the absorbent is prolonged;
(2) the system provided by the invention can process CO2The pyrolysis gas with wider content range can be treated by adopting the pipeline system according to the gradient distribution of the particle size of different gas guide paths of the middle pipeline;
(3) the product quality is more stable according to the CO in the pyrolysis gas2The content selection absorbent can also make the product CO produced by the rear outlet pipeline2The content is more stable regardless of CO in the pyrolysis gas2The high or low content of CO in the product2The content is reduced to qualified uniform standard;
(4) the system provided by the invention can replace the adsorbent without stopping working, the operation is more convenient, when the adsorbent is replaced, the use of a certain branch pipeline can be suspended, and other branches can continue to work, so that the system can replace the adsorbent without stopping working.
Drawings
FIG. 1 is a diagram illustrating the absorption of CO in pyrolysis gas by using a calcium-based absorbent according to an embodiment2The structural schematic diagram of the system of (1);
in the figure: 1-a front end inlet duct; 2-an intermediate pipeline; 3-a rear end outlet pipe; 4-CO2A content testing device; 5-processing the controller; 6-a valve; 7-calcium based absorbents; 8-a signal processor; 9-a digital power supply; 10-gas flow control means.
Detailed Description
The following further describes embodiments of the present invention in conjunction with the following examples and figures, but the practice of the present invention is not limited thereto.
This example provides a method for absorbing CO in pyrolysis gas by using calcium-based absorbent2As shown in fig. 1, the system comprises a front inlet pipeline 1, a gas flow control device 10, and CO connected in sequence2A content testing device 4, an intermediate pipeline 2 and a rear end outlet pipeline 3; the system further comprises a process controller 5, the process controller 5 being separately associated with the CO2The content testing device 4 is connected with the middle pipeline 2; the middle pipeline 2 comprises 4 branch pipelines, a valve 6 is arranged at the pipeline opening of each branch pipeline, the pipeline openings are respectively #1, #2, #3 and #4, and the corresponding branch pipelines are respectively a #1 branch pipeline, a #2 branch pipeline, a #3 branch pipeline and a #4 branch pipeline; a calcium-based absorbent 7 is arranged in each branch pipeline; the process controller 5 receives the CO2CO emitted by the content testing device 42The content signal and controls the valve 6 on the corresponding branch line.
CO2The content testing device 4 is a fourier transform infrared spectrometer. The calcium-based absorbent 7 is distributed in the middle of the branch pipe. The particle size of the calcium-based absorbents in each branch pipe is different. The particle diameters of the calcium-based absorbents in the branch pipes are distributed in a gradient manner. The particle size of the calcium-based absorbent in the #1 branch pipe is 75-120 microns corresponding to CO2The content interval is (6%, 10%)]The particle size of the calcium-based absorbent in the #2 branch pipeline is 120-180 microns and corresponds to CO2The content interval is (10%, 14%)]The particle size of the calcium-based absorbent in the #3 branch pipe is 180-250 microns, which corresponds to CO2The content interval is (14%, 18%)]The particle size of the calcium-based absorbent in the #4 branch pipe is 250-2The content interval is (18%, 22%)]，CO2The content is less than (6%,10%]The lowest boundary value still corresponds to the 1# branch line, which is higher than (18%, 22%]The highest boundary value still corresponds to the 4# branch line.
The process controller 5 is connected to the CO separately2The content testing device 4 and the intermediate pipeline 2 are connected through a lead. The process controller 5 comprises a signal processor 8 and a digital power supply 9, the signal processor 8 being arranged to receive the CO2CO emitted from the content measuring device 42The content signal outputs a valve switch signal, and the digital power supply 9 receives the valve switch signal through a lead and controls the phaseThe valve of the branch pipeline is opened and closed.
The invention also provides a method for controlling the absorption of CO in the pyrolysis gas by using the calcium-based absorbent2The method of (1), comprising the steps of:
(1) the process controller code is written in the C + + high level programming language (by way of example only):
(2) setting CO to the Process controller 5 and 4 branch lines of the intermediate line 22Interval of content according to CO2In the content interval, calcium-based absorbents 7 are arranged in 4 branch pipelines of the middle pipeline 2; setting the flow rate of the gas flow control device 10 to be 60 ml/min; setting CO to the Signal processor 82Content logging interval 20s, i.e. receiving CO once every 20s2The content testing device 4 is a signal sent by a Fourier transform infrared spectrometer. In actual production, the recording interval is larger than the scanning interval of the Fourier transform infrared spectrometer so as to avoid invalid calculation by the signal processor 8;
(3) introducing the denitrified and desulfurized pyrolysis gas into a front inlet pipeline 1, and introducing the denitrified and desulfurized pyrolysis gas into CO through the front inlet pipeline 12 Content measuring device 4, obtaining CO2Content, this example CO-measures CO of the pyrolysis gas2The volume contents are respectively 4%, 8%, 12%, 16%, 20% and 24%;
(4) the processing controller 5 receives the CO transmitted in the step (2)2A content signal, and CO preset in step (1)2Comparing the content zones to obtain valve opening/closing signals (0 is closing action, 1 is opening action), and controlling the valve opening/closing action of corresponding branch pipeline by the processing controller 5 according to the valve opening/closing signals, wherein each CO is2The opening and closing states of the valve 6 corresponding to the contents are shown in table 1;
TABLE 1
(5) The pyrolysis gas flows through a branch pipeline which is opened by a valve 6, and the calcium-based absorbent 7 of the branch pipeline removes CO in the pyrolysis gas2Removal of CO2The pyrolysis gas is discharged through a rear outlet pipeline 3.
The system and the control method provided by the embodiment can process CO2Pyrolysis gas with volume content ranging from 6% to 22%; only in the treatment of low CO content2The absorbent with large particle size and large mesh number is lost during pyrolysis gas. Furthermore, although CO is present2The content is changed, but the quality of the product from the rear outlet pipeline is kept stable. Furthermore, if desired, the calcium-based absorbent that is not in operation can be replaced without stopping the system from operating.
The above-mentioned embodiments are merely preferred embodiments of the present invention, and the scope of the present invention is not limited thereby, and all changes made in the shape and principle of the present invention should be covered within the scope of the present invention.
Claims (10)
1. Absorption of CO in pyrolysis gas by calcium-based absorbent2The system is characterized by comprising a front end inlet pipeline, a gas flow control device, CO which are connected in sequence2The content testing device, the middle pipeline and the rear end outlet pipeline; the system also includes a process controller, which is separately connected to the CO2The content testing device is connected with the middle pipeline; the middle pipeline comprises a plurality of branch pipelines, a valve is arranged at the pipeline opening of each branch pipeline, and a calcium-based absorbent is arranged in each branch pipeline; the process controller receives the CO2CO emitted by content testing device2The content signal controls the valve on the corresponding branch pipeline.
2. The method of claim 1 for absorbing CO in pyrolysis gas by using calcium-based absorbent2Characterised by the fact that CO2The content testing device is a Fourier transform infrared spectrometer.
3. The method of claim 1 for absorbing CO in pyrolysis gas by using calcium-based absorbent2The system of (1), wherein the calcium-based sorbent is distributed in the middle of the branch conduit.
4. The method of claim 1 for absorbing CO in pyrolysis gas by using calcium-based absorbent2The system according to (1), characterized in that the intermediate duct comprises 4-6 branch ducts.
5. The method of claim 1 for absorbing CO in pyrolysis gas by using calcium-based absorbent2The system according to (1), wherein the particle size of the calcium-based sorbent in each branch line is different from one another.
6. The method of claim 1 for absorbing CO in pyrolysis gas by using calcium-based absorbent2The system of (1), wherein the particle size distribution among the calcium-based absorbents in each branch conduit is in a gradient distribution.
7. The method of claim 1 for absorbing CO in pyrolysis gas by using calcium-based absorbent2The system is characterized in that when the pyrolysis gas flow is 50-70ml/min and the working temperature is 600-700 ℃, CO flows into the reactor2The volume content is (6%,10%]、(10%,14%]、(14%,18%]、(18%,22%]The particle diameters of the calcium-based absorbent corresponding to the pyrolysis gas are respectively (75 μm and 120 μm)]、(120μm,180μm]、(180μm,250μm]、(250μm,380μm]。
8. The method of claim 1 for absorbing CO in pyrolysis gas by using calcium-based absorbent2The system of (1), wherein the process controller is separately connected to the CO2Content testing deviceAnd the middle pipeline is connected through a lead.
9. The method of claim 1 for absorbing CO in pyrolysis gas by using calcium-based absorbent2Wherein the process controller comprises a signal processor for receiving the CO and a digital power supply2CO emitted by content testing device2The content signal outputs a valve switch signal, and the digital power supply receives the valve switch signal through a lead and controls the valve switch action of the corresponding branch pipeline.
10. Controlling the absorption of CO from pyrolysis gas by the calcium-based absorbent according to any one of claims 1 to 92The method of (a), comprising the steps of:
(1) setting CO to each branch pipe of the process controller and the intermediate pipe2Interval of content according to CO2In the content interval, calcium-based absorbent is arranged in each branch pipeline of the middle pipeline;
(2) introducing the pyrolysis gas into a front inlet pipeline, controlling the flow by a gas flow control device through the front inlet pipeline, and introducing the pyrolysis gas into CO2Content testing device to obtain CO2Content (c);
(3) the processing controller receives the CO transmitted in the step (2)2A content signal, and CO preset in step (1)2Comparing the content areas to obtain a valve switching signal, and controlling the valve switching action of the corresponding branch pipeline by the processing controller according to the valve switching signal;
(4) the pyrolysis gas flows through a branch pipeline of which the valve performs opening action, and the calcium-based absorbent of the branch pipeline removes CO in the pyrolysis gas2Removal of CO2The pyrolysis gas is discharged through a rear end outlet pipeline.
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