CN111841290A - Multi-mode flue gas carbon dioxide countercurrent absorption test device and test method - Google Patents
Multi-mode flue gas carbon dioxide countercurrent absorption test device and test method Download PDFInfo
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- 238000010521 absorption reaction Methods 0.000 title claims abstract description 176
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 100
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 61
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 50
- 238000012360 testing method Methods 0.000 title claims abstract description 41
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 239000003546 flue gas Substances 0.000 title claims abstract description 21
- 238000010998 test method Methods 0.000 title claims description 10
- 239000007788 liquid Substances 0.000 claims abstract description 258
- 239000007789 gas Substances 0.000 claims abstract description 192
- 238000003860 storage Methods 0.000 claims abstract description 85
- 238000012856 packing Methods 0.000 claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000007921 spray Substances 0.000 claims abstract description 52
- 238000005406 washing Methods 0.000 claims abstract description 47
- 238000009826 distribution Methods 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims description 19
- 239000003513 alkali Substances 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 18
- 238000005259 measurement Methods 0.000 claims description 17
- 239000011521 glass Substances 0.000 claims description 14
- 229910001220 stainless steel Inorganic materials 0.000 claims description 9
- 239000010935 stainless steel Substances 0.000 claims description 9
- 230000001502 supplementing effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 5
- 229920006351 engineering plastic Polymers 0.000 claims description 5
- 238000010907 mechanical stirring Methods 0.000 claims description 5
- 239000013589 supplement Substances 0.000 claims description 5
- 239000000919 ceramic Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 10
- 230000002745 absorbent Effects 0.000 description 6
- 239000002250 absorbent Substances 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000002253 acid Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000012800 visualization Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The invention relates to a multi-mode flue gas carbon dioxide countercurrent absorption test device, which comprises: the device comprises a gas generator, an absorption liquid supply system, an absorption tower, a water washing tower and a data acquisition control system; the gas generator is connected to a gas inlet at the lower part of the absorption tower through a gas passage, the absorption liquid supply system is connected to the bottom of the absorption tower through a pipeline, and a gas passage at the outlet of the absorption tower is connected with the water washing tower. The invention has the beneficial effects that: the invention adopts a carbon dioxide gas cylinder, an air compressor, a gas mixer and the like as a gas distribution system, and a gas mass flowmeter is arranged to realize accurate gas distribution of the system; the multi-working condition multi-form absorption is realized by combining a regular packed tower, a random packed tower, a spray tower, various absorption towers and various packing types; the liquid storage system and the liquid return system can be communicated and isolated; the absorption tower demisting device is combined with the comprehensive gas washing tower, so that the absorption liquid is recycled to the maximum extent; the system is ensured to be safe and reliable.
Description
Technical Field
The invention relates to the field of carbon dioxide capture, absorbent test and environmental protection, in particular to a multi-mode flue gas carbon dioxide countercurrent absorption test device and a test method.
Background
Carbon emission reduction gradually becomes the key point of concern at home and abroad, and as a carbon emission major household, emission reduction work of thermal power generation enterprises is imperative. At present, the main methods for reducing the emission of carbon dioxide comprise a physical adsorption method, a chemical absorption method, membrane diffusion separation, hydrate method separation and the like. The chemical absorption method has the advantages of lowest unit carbon emission reduction (including equipment investment and operation) cost and more large-scale application, and is the currently most promising technology. The key of the chemical absorption method is the development of an absorbent, the detection of absorption efficiency and the optimization of system operation parameters. At present, an absorption test device used in domestic and foreign researches is generally a single and small device, and the operation working condition can only be adjusted in a small range, so that the absorption mode and the operation working condition test are limited, and the test efficiency is low.
In order to improve carbon dioxide absorbent development efficiency, absorbent effect under the test different operating modes, the developer often designs many sets of experimental apparatus to different absorption modes, operation operating mode, when equipment purchasing cost promoted by a wide margin, has also increased operation maintenance cost and human cost. In addition, systematic errors among different devices are difficult to eliminate, and certain influence is caused on the performance evaluation of the absorbent. At present, a test device capable of meeting various absorption modes and operation conditions of carbon dioxide is not reported, so that the multi-mode flue gas carbon dioxide countercurrent absorption test device and the test method have important significance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a multi-mode flue gas carbon dioxide countercurrent absorption test device and a test method.
This kind of multimode flue gas carbon dioxide countercurrent absorption test device includes: the device comprises a gas generator, an absorption liquid supply system, an absorption tower, a water washing tower and a data acquisition control system; the gas generator is connected to a gas inlet at the lower part of the absorption tower through a gas passage, the absorption liquid supply system is connected to the bottom of the absorption tower through a pipeline, and a gas passage at the outlet of the absorption tower is connected with the water washing tower.
Preferably, the gas generator comprises CO2Gas cylinder, air compressor, gas pipeline mixer, gas mass flowmeter, multiple CO2The gas cylinder is connected into the inlet gas passage of the gas pipeline mixer together, and CO is2A gas mass flowmeter is arranged on the gas passage between the gas cylinder and the gas pipeline mixer; an air compressor outlet air passage is connected with an air passage of the air pipeline mixer, a gas flow meter (GFT) is connected to the air compressor outlet air passage, and a check valve is further arranged on the air passage between the gas flow meter (GFT) and the air pipeline mixer; a gas flow meter (GFT), a check valve, a temperature sensor (TT), a pressure sensor (PT) and a carbon dioxide gas Analyzer (AI) are arranged on an outlet air passage of the gas pipeline mixer; the outlet air passage of the gas pipeline mixer is divided into three paths which are respectively connected to the lower gas inlets of the random packed tower, the regular packed tower and the multilayer spray tower.
Preferably, the absorption liquid supply system comprises a liquid storage tank, a liquid return storage tank, a packed tower absorption liquid circulating pump, a liquid flow meter (LFT), a liquid level sensor (LT) and an absorption liquid preparation system, and the absorption liquid preparation system comprises an alkali liquid preparation box and an absorption liquid supplement pump; the upper part of the alkali liquor preparation box is provided with a water inlet, and the outlet is provided with an absorption liquid replenishing pump; an outlet pipeline of the alkali liquor preparation box is connected with an inlet pipeline of an absorption liquid supplementing pump; an outlet pipeline of the absorption liquid supplementing pump is connected to a water inlet at the upper part of the liquid storage tank, and a check valve is also arranged on a pipeline between the absorption liquid supplementing pump and the liquid storage tank; a filter screen is arranged in front of the water outlet of the liquid return storage tank, the water outlet of the liquid return storage tank is connected to the water inlet at the upper part of the liquid storage tank through a pump, and a check valve is arranged on a pipeline between the pump and the liquid storage tank; the water inlet of the liquid return storage tank is respectively connected to the bottom of the random packed tower, the regular packed tower and the multilayer spray tower through pipelines, and two check valves and a temperature sensor (TT) are respectively arranged on the pipelines from the water inlet of the liquid return storage tank to the bottom of the random packed tower, the regular packed tower and the multilayer spray tower; a liquid level sensor (LT) and a pH meter are also arranged in the liquid return storage tank; a filter screen is arranged in front of the water outlet of the liquid storage tank, the water outlet of the liquid storage tank is divided into a plurality of pipelines which are respectively connected to each spraying layer of the multi-layer spraying tower, and each pipeline is provided with a spraying tower absorption liquid circulating pump, a check valve, a liquid flow meter (LFT) and a temperature sensor (TT); the water outlet of the liquid storage tank is connected to an inlet pipeline of an absorption liquid circulating pump of the packed tower, the outlet of the absorption liquid circulating pump is provided with a check valve, the outlet pipeline of the absorption liquid circulating pump is divided into two paths which are respectively connected to a random packed tower and a regular packed tower top water inlet, a liquid flow meter (LFT) and a temperature sensor (TT) are arranged on the pipelines from the outlet of the absorption liquid circulating pump of the packed tower to the random packed tower and the regular packed tower top water inlet, and a liquid level sensor (LT) and a pH meter are arranged inside the liquid storage tank.
Preferably, the absorption tower comprises a random packed tower, a regular packed tower and a multi-layer spray tower, wherein a demister washing spray layer, a demister, a packed tower absorption liquid spray layer and a plurality of packing layers are sequentially arranged in the random packed tower and the regular packed tower from the top to the bottom of the tower; a temperature sensor (TT), a pressure sensor (PT) and a gas-liquid sampling port are arranged between the packing layers; a plurality of spray tower absorption liquid spray layers are arranged in the multi-layer spray tower.
Preferably, the water washing tower is arranged at the outlet of the absorption tower, the top outlet air passages of the random packing tower, the regular packing tower and the multilayer spray tower are all connected with check valves and then are connected to the bottom of the water washing tower, and a temperature sensor (TT), a pressure sensor (PT) and a carbon dioxide gas Analyzer (AI) are also arranged on the air passage between the inlet of the water washing tower and the absorption tower; a water outlet pipeline at the bottom of the washing tower is connected to an inlet pipeline of a water storage tank of the washing tower, and a check valve is also arranged on the water outlet pipeline at the bottom of the washing tower; an outlet pipeline of a water storage tank of the washing tower is connected to a water inlet at the top of the washing tower through a circulating pump of the washing tower, and a check valve is also arranged on the pipeline behind the circulating pump of the washing tower; and a temperature sensor (TT), a pressure sensor (PT), a carbon dioxide gas Analyzer (AI) and a Gas Flowmeter (GFT) are arranged on the top air passage of the washing tower.
Preferably, the liquid storage tank and the liquid return storage tank are horizontal tanks or vertical tanks, and comprise cylindrical tanks, square tanks, spherical tanks and funnel-shaped tanks, and the volume of the tanks is 50-500L; the standard height of the liquid storage tank and the liquid return storage tank is lower than that of a liquid return pipe of the absorption tower; and 5-10 micron filter screens are arranged in the absorption liquid of the liquid storage tank and the absorption liquid of the liquid return storage tank before the absorption liquid enters the pump.
Preferably, gas distribution and water distribution devices are arranged in the random packing tower, the regular packing tower and the multilayer spray tower; the circulating amount of the absorption liquid circulating pump of the packing tower in the packed tower is 0-100L/h; the random packing tower and the regular packing tower adopt a multi-stage installation mode; a gas inlet is formed in the bottom of the packing tower, and a gas temperature measuring point is arranged at the gas inlet; the random packed tower and the regular packed tower are made of organic glass or stainless steel, the inner diameter is 40-100 mm, 2-6 layers of packing layers are arranged, and the effective height of each layer of packing is 200-1000 mm; the structured packing of the packing layer of the structured packing tower adopts a corrugated plate form and is made of stainless steel, organic glass, engineering plastics, glass and ceramics; the random packing of the packing layer of the random packing tower adopts Raschig rings, pall rings, stepped rings and arc saddle-shaped packing, and the packing material comprises stainless steel, organic glass, engineering plastics, glass and ceramics; the multi-layer spray tower is made of organic glass or stainless steel, the inner diameter of the multi-layer spray tower is 40-100 mm, and 2-6 spray layers are arranged; and each spraying layer adopts a spraying tower absorption liquid circulating pump to supply liquid, and the circulation amount of the absorption liquid of each spraying tower absorption liquid circulating pump is 0-100L/h.
The test method of the multi-mode flue gas carbon dioxide countercurrent absorption test device comprises the following steps:
step 1, opening a water washing tower to establish a water washing environment, opening a temperature sensor (TT), a pressure sensor (PT) and a carbon dioxide gas Analyzer (AI) on an inlet and outlet pipeline of the water washing tower, and opening a Gas Flowmeter (GFT) arranged at an outlet of the water washing tower;
step 3.1, when the packed tower is selected as a test tower, opening corresponding valves of the packed tower, opening a temperature sensor (TT), a pressure sensor (PT), liquid level sensors (LT), a pH meter and a liquid flow meter (LFT) of a liquid storage tank and a liquid return storage tank corresponding to the packed tower, opening an absorption liquid circulating pump of the packed tower, and establishing an absorption liquid circulating system;
3.2, when the multi-layer spray tower is selected as a test tower, opening each valve of the multi-layer spray tower, opening a temperature sensor (TT), a pressure sensor (PT), a liquid level sensor (LT), a pH meter and a liquid flow meter (LFT) of the liquid storage tank and the liquid return storage tank corresponding to the multi-layer spray tower, opening a circulating pump of absorption liquid of the spray tower, and establishing an absorption liquid circulating system;
step 4, opening a temperature sensor (TT) at the inlet of the test tower, a pressure sensor (PT) and a carbon dioxide gas Analyzer (AI), and opening CO2Gas supply valve, air compressor and gas mass flowmeter on gas cylinder for regulating CO2Measuring the gas flow at the outlet of the gas cylinder and the air compressor by a gas mass flowmeter to obtain the gas flow, and mixing the air and CO2Fully mixing in a gas pipeline mixer;
Preferably, the measurement precision of a gas flow meter (GFT) on the outlet gas passage of the water scrubber in the step 1 is more than 0.5%; in the step 3, the measurement precision of the liquid level sensor (LT) is more than 1%; the measurement precision of the Liquid Flowmeter (LFT) is more than 0.5%; the spraying tower absorption liquid circulating pump and the packed tower absorption liquid circulating pump are frequency conversion pumps, and the liquid control precision is more than 0.5 percent; the gas mass flowmeter in the step 4 has the flow measurement precision of more than 0.5 percent, the concentration of carbon dioxide is ensured to be within 0.03-50 percent, and the gas mass flowmeter controls the gas flow to be 0.05-50 Nm3Is between/h.
Preferably, the concentration of the absorption liquid in the step 2 is in a range of 0.5-3 mol/L; the volume of the alkali liquor preparation box is 30-100L; a mechanical stirring device is arranged in the alkali liquor preparation box, and the rotating speed of the mechanical stirring device is within the range of 30-200 rpm; the flow range of the absorption liquid replenishing pump is 60-200L/h; in the step 4: CO 22The gas cylinder is provided with 1-20 cylinders of CO2The gas cylinder supplies gas in a branch and main pipe mode, and the volume specifications of the gas cylinder comprise 4L, 8L and 40L; the air compressor is provided with a 10L-100L gas buffer tank; the gas line mixer includes a spoiler-type gas mixer, a tank-type gas mixer, a tube-type gas mixer, a venturi gas mixer, and a turbine-type gas mixer.
The invention has the beneficial effects that: the multi-mode flue gas carbon dioxide countercurrent absorption test device adopts a carbon dioxide gas cylinder, an air compressor, a gas mixer and the like as a gas distribution system, and is provided with a gas mass flow meter to realize accurate gas distribution of the system; the multi-working condition multi-form absorption is realized by combining a regular packed tower, a random packed tower, a spray tower, various absorption towers and various packing types; the liquid storage system and the liquid return system can be communicated and isolated; the absorption tower demisting device is combined with the comprehensive gas washing tower, so that the absorption liquid is recycled to the maximum extent, and green and clean emission is realized by exhaust; the safe, reliable and automatic operation of the system is ensured by adopting multi-point data acquisition, visualization, alarm and interlocking protection.
Drawings
FIG. 1 is a schematic diagram of a multi-mode thermal power plant flue gas carbon dioxide absorption test device;
fig. 2 is a schematic structural diagram of a packed tower and a spray tower.
Description of reference numerals: CO 22The device comprises a gas cylinder 1, an air compressor 2, a gas pipeline mixer 3, a random packing tower 4, a regular packing tower 5, a multilayer spray tower 6, a liquid storage tank 7, a liquid return storage tank 8, a washing tower 9, a spray tower absorption liquid circulating pump 10, an alkali liquor preparation tank 11, a packing tower absorption liquid circulating pump 12, a gas mass flowmeter 13, a temperature sensor 14, a gas flowmeter 15, a liquid flowmeter 16, a liquid level sensor 17, a pH meter 18, a washing tower circulating pump 19, a washing tower water storage tank 20, a filter screen 21, a demister washing and spraying layer 22, a demister 23, a packing tower absorption liquid spraying layer 24, a packing layer 25, a gas-liquid sampling port 26, a spray tower absorption liquid spraying layer 27, a pressure sensor 28, an absorption liquid supplementing pump 29 and a heat exchanger 30.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to aid in the understanding of the invention. It should be noted that, for a person skilled in the art, several modifications can be made to the invention without departing from the principle of the invention, and these modifications and modifications also fall within the protection scope of the claims of the present invention.
The method comprises the steps of opening a washing tower to establish a washing environment before an experiment is started, selecting an experimental absorption tower, opening a temperature sensor, a pressure sensor and a carbon dioxide gas analyzer of an inlet and outlet pipeline of the washing tower, opening an outlet of the washing tower and arranging a gas flowmeter, and ensuring that the gas mass flowmeter has 0.5% of measurement precision and is corrosion-resistant.
The packed tower is provided with absorption liquid with the concentration of 2mol/L in an alkali liquor preparation box and is conveyed to a liquid storage tank through an absorption liquid replenishing pump.
The volume of the alkali liquor preparation box is 60L, a mechanical stirring device is arranged, the rotating speed is continuously adjustable within the range of 60-100 rpm, a water inlet is formed in the upper portion of the box body, an absorption liquid supplementing pump is arranged at an outlet, and the flow range of the pump is 60-100L/h.
Selecting a random packing tower as a test tower, opening an inlet and outlet valve of the random packing tower, opening a sensor, a pressure sensor, a liquid storage tank and a liquid return storage tank (circulating operation) liquid flowmeter, a pH meter and a liquid flowmeter, and opening an absorption liquid circulating pump to establish absorption liquid circulation.
The absorption tower is internally provided with an even gas distribution device and a water distribution device, the packed tower adopts a multi-stage installation mode, each stage can be independently disassembled and assembled, temperature and pressure sensors are arranged between stages, the top of the tower is provided with a wire mesh type demister, the demister is provided with a flushing spray device, the lower part of the tower is provided with a gas inlet, and the inlet is provided with a gas temperature measuring point.
The random packing tower and the regular packing tower are made of organic glass, the inner diameter of the random packing tower is 60mm, 4 layers of packing are arranged, the effective height of each layer of packing is 400mm, and gas and liquid sampling ports are arranged between the packing layers. The packed tower is provided with a packed tower absorption liquid circulating pump, the circulation volume of the absorption liquid is 40L/h, the continuous and accurate control can be realized, and the outlet of the pump is provided with a check valve. The regular packing adopts a corrugated plate form, the material is stainless steel, the random packing adopts two forms of raschig rings and pall rings, and the material is engineering plastics.
The multilayer spray tower adopts the organic glass material, and internal diameter 60mm, 4 spray the layer, and every sprays the layer and adopts independent absorption liquid circulating pump to supply liquid, adopts the inverter pump, and every circulating pump absorption liquid circulation volume 20L/h can continuous accurate control, and the pump export is established the check valve, and the shower nozzle can ensure that the absorption liquid well atomizes and evenly distributes, and the gas that gets into the absorption tower can distribute evenly.
The liquid storage tank and the liquid return storage tank can realize one-time operation and circulating operation of absorption liquid through different valve combination modes.
The liquid storage tank and the liquid return storage tank adopt horizontal tanks in the form of cylindrical tanks, the volume of each horizontal tank is 100L, the elevation is lower than the liquid return pipes of the absorption towers, the three absorption towers can smoothly return liquid, the liquid return is controlled by a liquid level sensor and is controlled to return liquid to the liquid return storage tank or the liquid storage tank through a valve, the liquid return storage tank conveys the return liquid to the liquid storage tank through a pump, and the liquid storage tank and the liquid return storage tank are provided with 5-10 micron filter screens before the absorption liquid enters the pump.
The liquid flowmeter has the measurement accuracy of more than 1 percent, is resistant to acid and alkali corrosion, and remotely transmits a liquid level signal to a data acquisition control system through a transmitter to realize automatic liquid drainage control.
The liquid flowmeter has the measurement accuracy of more than 0.5 percent, is resistant to acid and alkali corrosion, and remotely transmits a liquid level signal to the data acquisition control system through the transmitter.
The packed tower absorption liquid circulating pump and the spray tower absorption liquid circulating pump are variable frequency pumps, have liquid control accuracy of more than 0.5 percent, are resistant to acid and alkali corrosion, remotely transmit flow signals to a data acquisition control system through a transmitter, and can automatically adjust output according to feedback signals of a liquid flowmeter.
The circulating water of the water washing tower is uniformly distributed with water and gas, the water and the gas are fully contacted, the heat exchanger is arranged, the temperature sensor, the pressure sensor and the carbon dioxide gas analyzer at the inlet of the absorption tower are opened when the water temperature is not too high, the carbon dioxide gas supply valve, the air compressor and the gas mass flow meters are opened, the gas flow at the outlet of the carbon dioxide gas cylinder and the air compressor is adjusted, the gas is generated according to the set proportion, the gas flow is measured by the gas mass flow meters, and the two gases are fully and uniformly mixed in the gas mixer.
The carbon dioxide gas cylinder is provided with 2 cylinders according to the gas quantity and the supplement period required by the test, the gas is supplied in a busbar mode, and the size of the gas cylinder can be 40L.
The air compressor machine is equipped with 30L gas buffer tank, ensures that air feed pressure is stable.
The gas mixer adopts a spoiler type gas mixer.
The gas mass flowmeter meets the measuring range requirement, has the performances of flow measurement precision of more than 0.5 percent, corrosion resistance and the like, and can precisely adjust the gas flow, the concentration of carbon dioxide generated by the gas generator is adjustable and controllable between 5 percent and 30 percent, and the gas flow is 3-5Nm3The/h is adjustable and controllable.
The experimental process collects the measured data of each sensor and instrument in real time, and the data collection control system is matched with a local control system and adopts PLC control and screen display and control. The system can be controlled on site or automatically controlled by PLC.
The data acquisition control system adopts a computer and advanced software (such as a PLC300) to carry out real-time monitoring and control (controlling the gas production speed of carbon dioxide and an air compressor according to the measurement value of a gas mass flowmeter, controlling the speed of absorbing and returning a liquid storage tank or a liquid returning storage tank according to the liquid level at the bottom of the absorption tower, and controlling the output of an absorption liquid circulating pump of a packed tower or an absorption liquid circulating pump of a spray tower in real time according to the measurement value of a liquid flowmeter of absorption liquid. The liquid flowmeter, the valve and the matched data acquisition module are provided with communication interfaces, signals of each sensor and each monitoring instrument can be transmitted to the PLC in real time, the control, management and analysis of the test device are completed through set logic, monitored and controlled parameters include but are not limited to temperature, pressure, flow, liquid level and the like, and relevant process parameters and alarm limits can be set and modified as required; if the computer system is in failure, the instrument operator can directly operate the instrument according to the traditional instrument using method; and when the related parameters exceed the preset upper limit, timely sending out an alarm signal.
The invention provides a multi-mode flue gas carbon dioxide countercurrent absorption test device and a test method aiming at the defects of the existing carbon dioxide absorption test device, wherein the test device comprises the following components: the principle of accurate gas distribution of the system is as follows: a carbon dioxide gas cylinder, an air compressor, a gas mixer and the like are used as a gas distribution system, the gas volume is accurately measured through a gas mass flowmeter, and gas with target concentration is prepared; the principle of multi-condition and multi-form absorption is as follows: the combination of test conditions such as different absorbents, different liquid-gas ratios, different packing forms, different packing layer numbers, packing layer heights, different spraying layer numbers, different layered gas-liquid ratios and the like is realized by adopting a mode of combining a regular packing tower, a random packing tower, a spray tower, multiple absorption towers and multiple packing types; the principle of continuous operation and intermittent operation research is as follows: the absorption liquid can be circularly operated in the system and can be operated in a disposable mode through the operation mode of communicating and isolating the liquid storage system and the liquid return system; the principle of maximum utilization of materials and green emission of gas is as follows: the design of combining the absorption tower demisting device and the comprehensive gas washing tower is adopted to trap the absorption liquid to the maximum extent and recycle the absorption liquid in the system, and the exhausted gas is fully washed by water to realize green clean discharge; the principle of safe, reliable and automatic operation is as follows: the safe, reliable and automatic operation of the system is ensured by adopting multi-point data acquisition, visualization, alarm and interlocking protection.
Claims (10)
1. The utility model provides a multimode flue gas carbon dioxide countercurrent absorption test device which characterized in that includes: the device comprises a gas generator, an absorption liquid supply system, an absorption tower, a water washing tower (9) and a data acquisition control system; the gas generator is connected to a gas inlet at the lower part of the absorption tower through a gas passage, the absorption liquid supply system is connected to the bottom of the absorption tower through a pipeline, and a gas passage at the outlet of the absorption tower is connected with the water washing tower.
2. The multimode flue gas carbon dioxide countercurrent absorption test device according to claim 1, characterized in that: the gas generator comprises CO2A gas cylinder (1), an air compressor (2), a gas pipeline mixer (3), a gas mass flowmeter (13), a plurality of CO2The gas cylinder (1) is connected with an inlet gas passage of a gas pipeline mixer (3) and CO2A gas mass flowmeter (13) is arranged on a gas passage between the gas cylinder (1) and the gas pipeline mixer (3); an outlet air passage of the air compressor (2) is connected to an inlet air passage of the gas pipeline mixer (3), a gas flow meter (15) is connected to the outlet air passage of the air compressor (2), and a check valve is further arranged on an air passage between the gas flow meter (15) and the gas pipeline mixer (3); a gas flow meter (15), a check valve, a temperature sensor (14), a pressure sensor (28) and a carbon dioxide gas analyzer (30) are arranged on an outlet gas passage of the gas pipeline mixer (3); the outlet air passage of the gas pipeline mixer (3) is divided into three paths which are respectively connected to the lower gas inlets of the random packing tower (4), the regular packing tower (5) and the multilayer spray tower (6).
3. The multimode flue gas carbon dioxide countercurrent absorption test device according to claim 1, characterized in that: the absorption liquid supply system comprises a liquid storage tank (7), a liquid return storage tank (8), a packed tower absorption liquid circulating pump (12), a liquid flow meter (16), a liquid level sensor (17) and an absorption liquid preparation system, wherein the absorption liquid preparation system comprises an alkali liquid preparation box (11) and an absorption liquid supplement pump (29); the upper part of the alkali liquor preparation box (11) is provided with a water inlet, and the outlet is provided with an absorption liquid replenishing pump (29); an outlet pipeline of the alkali liquor preparation box (11) is connected to an inlet pipeline of an absorption liquid supplement pump (29); an outlet pipeline of the absorption liquid supplementing pump (29) is connected to a water inlet at the upper part of the liquid storage tank (7), and a check valve is also arranged on a pipeline between the absorption liquid supplementing pump (29) and the liquid storage tank (7); a filter screen (21) is arranged in front of the water outlet of the liquid return storage tank (8), the water outlet of the liquid return storage tank (8) is connected to the water inlet at the upper part of the liquid storage tank (7) through a pump, and a check valve is arranged on a pipeline between the pump and the liquid storage tank (7); a water inlet of the liquid return storage tank (8) is respectively connected to the bottoms of the random packing tower (4), the regular packing tower (5) and the multilayer spray tower (6) through pipelines, and two check valves and a temperature sensor (14) are respectively arranged on the pipelines from the water inlet of the liquid return storage tank (8) to the bottoms of the random packing tower (4), the regular packing tower (5) and the multilayer spray tower (6); a liquid level sensor (17) and a pH meter (18) are also arranged in the liquid return storage tank (8); a filter screen (21) is arranged in front of the water outlet of the liquid storage tank (7), the water outlet of the liquid storage tank (7) is divided into a plurality of pipelines which are respectively connected to each spraying layer of the multi-layer spraying tower (6), and each pipeline is provided with a spraying tower absorption liquid circulating pump (10), a check valve, a liquid flowmeter (16) and a temperature sensor (14); the water outlet of the liquid storage tank (7) is connected into an inlet pipeline of an absorption liquid circulating pump (12) of the packed tower, the outlet of the absorption liquid circulating pump (12) is provided with a check valve, the outlet pipeline of the absorption liquid circulating pump (12) is divided into two paths which are respectively connected into a random packed tower (4) and a regular packed tower (5) top water inlet, the outlet of the absorption liquid circulating pump (12) of the packed tower is provided with a liquid flow meter (16) and a temperature sensor (14) on pipelines from the random packed tower (4) to the regular packed tower (5) top water inlet, and the liquid storage tank (7) is internally provided with a liquid level sensor (17) and a pH meter (.
4. The multimode flue gas carbon dioxide countercurrent absorption test device according to claim 1, characterized in that: the absorption tower comprises a random packing tower (4), a structured packing tower (5) and a plurality of layers of spray towers (6), wherein a demister washing spray layer (22), a demister (23), a packing tower absorption liquid spray layer (24) and a plurality of packing layers (25) are sequentially arranged inside the random packing tower (4) and the structured packing tower (5) from the top to the bottom of the tower; a temperature sensor (14), a pressure sensor (28) and a gas-liquid sampling port (26) are arranged between the packing layers (25); a plurality of spray tower absorption liquid spray layers (27) are arranged in the multi-layer spray tower (6).
5. The multimode flue gas carbon dioxide countercurrent absorption test device according to claim 1, characterized in that: the water scrubber (9) is arranged at the outlet of the absorption tower, the top outlet air passages of the random packing tower (4), the regular packing tower (5) and the multilayer spray tower (6) are all connected with check valves and then are connected to the bottom of the water scrubber (9), and a temperature sensor (14), a pressure sensor (28) and a carbon dioxide gas analyzer (30) are also arranged on the air passage between the inlet of the water scrubber (9) and the absorption tower; a water outlet pipeline at the bottom of the water washing tower (9) is connected to an inlet pipeline of a water storage tank (20) of the water washing tower, and a check valve is also arranged on the water outlet pipeline at the bottom of the water washing tower (9); an outlet pipeline of a water storage tank (20) of the washing tower is connected to a water inlet at the top of the washing tower (9) through a circulating pump (19) of the washing tower, and a check valve is further arranged on the pipeline behind the circulating pump (19) of the washing tower; a temperature sensor (14), a pressure sensor (28), a carbon dioxide gas analyzer (30) and a gas flowmeter (15) are arranged on a top air passage of the water washing tower (9).
6. The multimode flue gas carbon dioxide countercurrent absorption test device according to claim 3, characterized in that: the liquid storage tank (7) and the liquid return storage tank (8) are horizontal tanks or vertical tanks, and comprise cylindrical tanks, square tanks, spherical tanks and funnel-shaped tanks, and the volume of the tanks is 50-500L; the standard heights of the liquid storage tank (7) and the liquid return storage tank (8) are lower than the liquid return pipe of the absorption tower; the absorption liquid of the liquid storage tank and the absorption liquid of the liquid return storage tank are provided with a 5-10 micron filter screen (21) before being pumped.
7. The multimode flue gas carbon dioxide countercurrent absorption test device according to claim 4, characterized in that:
gas and water distribution devices are arranged in the random packing tower (4), the regular packing tower (5) and the multilayer spray tower (6); the circulation amount of the absorption liquid circulating pump (12) of the packing tower in the packed tower is 0-100L/h; the random packing tower (4) and the regular packing tower (5) both adopt a multistage installation mode; a gas inlet is formed in the bottom of the packing tower, and a gas temperature measuring point is arranged at the gas inlet;
the random packing tower (4) and the regular packing tower (5) are made of organic glass or stainless steel, the inner diameter is 40-100 mm, 2-6 layers of packing layers are arranged, and the effective height of each layer of packing is 200-1000 mm; the structured packing of the packing layer of the structured packing tower (5) adopts a corrugated plate form and is made of stainless steel, organic glass, engineering plastics, glass and ceramics; the random packing of the packing layer of the random packing tower (4) adopts Raschig rings, pall rings, stepped rings and arc saddle-shaped packing, and the packing material comprises stainless steel, organic glass, engineering plastics, glass and ceramics; the multi-layer spray tower (6) is made of organic glass or stainless steel, the inner diameter is 40-100 mm, and 2-6 spray layers are arranged; each spraying layer adopts a spraying tower absorption liquid circulating pump (10) to supply liquid, and the circulation volume of the absorption liquid of each spraying tower absorption liquid circulating pump (10) is 0-100L/h.
8. The test method of the multimode flue gas carbon dioxide countercurrent absorption test device according to claim 1, characterized by comprising the following steps:
step 1, opening a water washing tower (9) to establish a water washing environment, opening a temperature sensor (14), a pressure sensor (28) and a carbon dioxide gas analyzer (30) on an inlet and outlet pipeline of the water washing tower (9), and opening a gas flowmeter (15) arranged at an outlet of the water washing tower (9);
step 2, preparing absorption liquid with a certain concentration in an alkali liquor preparation box (11), and conveying the absorption liquid to a liquid storage tank (7) through an absorption liquid supplement pump (29);
step 3, selecting a packed tower or a multi-layer spray tower (6) as a test tower, wherein the packed tower comprises a random packed tower (4) and a regular packed tower (5); the liquid storage tank (7) and the liquid return storage tank (8) are combined to run absorption liquid at one time or circularly through different valves;
step 3.1, when the packed tower is selected as a test tower, opening corresponding valves of the packed tower, opening a temperature sensor (14), a pressure sensor (28), a liquid storage tank (7) and a liquid level sensor (17), a pH meter (18) and a liquid flow meter (16) of a liquid return storage tank (8) which correspond to the packed tower, opening an absorption liquid circulating pump (12) of the packed tower, and establishing an absorption liquid circulating system;
3.2, when the multi-layer spray tower (6) is selected as a test tower, opening each valve of the multi-layer spray tower (6), opening a temperature sensor (14), a pressure sensor (28), a liquid level sensor (17), a pH meter (18) and a liquid flow meter (16) of a liquid storage tank (7) and a liquid return storage tank (8) which correspond to the multi-layer spray tower (6), opening a spray tower absorption liquid circulating pump (10), and establishing an absorption liquid circulating system;
step 4, opening a temperature sensor (14) at the inlet of the test tower, a pressure sensor (28) and a carbon dioxide gas analyzer (30), and opening a CO (carbon monoxide) analyzer2An air supply valve, an air compressor (2) and a gas mass flowmeter (13) on the gas cylinder (1) are used for regulating CO2The gas flow at the outlet of the gas cylinder (1) and the air compressor (2) is measured by a gas mass flowmeter (13) to obtain the gas flow, and air and CO are mixed2Fully mixing in a gas pipeline mixer (3);
step 5, the data acquisition control system acquires the measurement data of each gas mass flow meter (13), each temperature sensor (14), each gas flow meter (15), each liquid flow meter (16), each liquid level sensor (17), each pH meter (18), each pressure sensor (28) and each carbon dioxide gas analyzer (30) in real time through a computer; the data acquisition control system is controlled in situ or by a PLC control system; the control mode is as follows: controlling CO on the basis of the measured values of a gas mass flowmeter (13)2The gas production speed of the gas cylinder (1) and the air compressor (2) controls the speed of the absorption liquid returning to the liquid storage tank (7) or the liquid returning storage tank (8) according to the liquid level at the bottom of the absorption tower; the output of the spray tower absorption liquid circulating pump (10) or the packed tower absorption liquid circulating pump (12) is controlled in real time through the measured value of the liquid flowmeter (16).
9. The test method of the multimode flue gas carbon dioxide countercurrent absorption test device according to claim 8, characterized in that:
the measurement precision of a gas flowmeter (15) on an outlet gas passage of the water scrubber (9) in the step 1 is more than 0.5%;
the measurement precision of the liquid level sensor (17) in the step 3 is more than 1%; the measurement precision of the liquid flowmeter (16) is more than 0.5%; the spraying tower absorption liquid circulating pump (10) and the packed tower absorption liquid circulating pump (12) are frequency conversion pumps, and the liquid control precision is more than 0.5 percent;
the gas mass flowmeter (13) in the step 4 has the flow measurement precision of more than 0.5 percent, and ensures that the concentration of carbon dioxide is within 0.03 to 50 percent and the mass flow of gasThe meter (13) controls the gas flow rate to be 0.05-50 Nm3Is between/h.
10. The test method of the multimode flue gas carbon dioxide countercurrent absorption test device according to claim 8, characterized in that:
the concentration range of the absorption liquid in the step 2 is 0.5-3 mol/L; the volume of the alkali liquor preparation box (11) is 30-100L; a mechanical stirring device is arranged in the alkali liquor preparation box (11), and the rotating speed of the mechanical stirring device is within the range of 30-200 rpm; the flow range of the absorption liquid replenishing pump (29) is 60-200L/h;
in the step 4: CO 22The gas cylinder (1) is provided with 1-20 cylinders of CO2The gas cylinder (1) supplies gas in a branch and main pipe mode, and the volume specifications of the gas cylinder comprise 4L, 8L and 40L; the air compressor (2) is provided with a 10L-100L gas buffer tank; the gas pipeline mixer (3) comprises a flow disturbing plate type gas mixer, a tank type gas mixer, a tubular type gas mixer, a Venturi gas mixer and a turbine type gas mixer.
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