CN213275482U - Mixed desulfurizer wet flue gas desulfurization performance test device - Google Patents
Mixed desulfurizer wet flue gas desulfurization performance test device Download PDFInfo
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Abstract
The invention discloses a mixed desulfurizer wet desulphurization performance testing device which comprises a mixed desulfurizer slurry preparation system, a slurry spraying system, a slurry circulating and mixing system, a simulated flue gas supply system, an oxygen supply system, a flue gas analysis system and a pH detection device. The device uses two desulfurizer raw materials to respectively prepare desulfurizer slurry, mixes the desulfurizer slurry according to a required proportion, leads the mixture into an absorption tower with a circulating transfusion component, carries out desulfurization treatment on simulated flue gas through a slurry spraying system, detects the pH of the slurry through a pH detection device, and detects the concentration of sulfur dioxide in the desulfurized flue gas through a flue gas analyzer. The device can test the influence of different impurities contained in the desulfurizer on the desulfurization absorption performance in different mixing ratio of the mixed desulfurizer in wet desulfurization.
Description
Technical Field
The invention relates to the field of flue gas desulfurization, in particular to a wet desulphurization performance testing device.
Background
The flue gas desulfurization is widely adopted at home and abroad to control SO in coal-fired flue gas2Among them, the wet desulfurization process is the most widely used and efficient flue gas desulfurization process in the world. The wet desulfurization mostly uses lime slurry as a desulfurizing agent to remove SO in an absorption tower2Spraying and washing the flue gas to ensure that SO in the flue gas2Reaction to produce CaSO3And CaSO4Simultaneously blowing air into the slurry in the absorption tower to force the CaSO3Are all oxidized into CaSO4The by-product of the desulfurization is gypsum. The air sparged helps produce a more uniform slurry, facilitates 90% desulfurization, and facilitates control of fouling and plugging.
The industrial field also comprises dry and semi-dry desulphurization technology, and the desulfurized ash is a byproduct generated by the desulphurization technology and is mainly used for simple blending of building materials or consumption treatment of solid wastes at present. The pellet desulfurization ash mainly comprises alkaline substances such as calcium hydroxide, calcium carbonate, calcium sulfite, calcium oxide and the like, can partially replace limestone powder desulfurizing agent, and is used for a wet desulfurization system. Chinese patent application CN 102000481B discloses a method for treating desulfurized fly ash, which comprises mixing desulfurized fly ash with limestone powder in proportion, and using the mixture as a raw material of a desulfurizing agent in a wet flue gas desulfurization process to perform wet desulfurization. However, the desulfurization ash of the limestone powder serving as the existing desulfurizer in the power plant contains a large amount of impurities such as aluminum, iron, fluorine, magnesium, chlorine and the like, the influence of the impurities on the desulfurization performance of a desulfurization system and the influence of different proportions of desulfurization ash and limestone powder on the desulfurization performance are still lack of research at present.
Therefore, it is urgently needed to design a device capable of testing the performance of the mixed desulfurizer in wet desulphurization.
Disclosure of Invention
The invention provides a device for testing the wet desulphurization performance of a mixed desulfurizer, aiming at overcoming the defect of the lack of performance test of the mixed desulfurizer in the prior art, the provided device can control the proportion of the mixed desulfurizer through weight detection, and uniformly mix the slurry of the mixed desulfurizer through a circulating transfusion component in an absorption tower so as to test the influence of different impurities contained in desulphurization ash on the desulphurization absorption performance and the influence of different proportions of 'desulphurization ash and limestone powder' on the desulphurization performance in wet desulphurization.
In order to solve the technical problems, the invention adopts the technical scheme that:
a desulfurizing agent wet desulfurization performance testing device comprises: the absorption tower is provided with a slurry inlet, a flue gas inlet, an oxygen inlet, a slurry outlet, a flue gas outlet and a liquid outlet; the slurry inlet, the flue gas inlet, the oxygen inlet and the slurry outlet are positioned at the lower part of the absorption tower, and the flue gas outlet is positioned at the top of the absorption tower; the liquid outlet is positioned at the bottom of the absorption tower;
the desulfurizer supply system comprises at least two pulping systems and a slurry mixing storage tank, wherein the pulping systems are communicated with one side of the slurry mixing storage tank, and the other side of the slurry mixing storage tank is communicated with a slurry inlet;
the inlet of the circulating transfusion part is communicated with the bottom in the absorption tower, the outlet of the circulating transfusion part is communicated with the lower part in the absorption tower, and the outlet of the circulating mixing part is higher than the inlet;
a pH detection device for testing the pH of the slurry in the absorption tower;
the gas outlet of the flue gas supply system is communicated with the flue gas inlet;
an oxygen supply system, wherein an air outlet of the oxygen supply system is communicated with an oxygen inlet;
the slurry spraying system comprises a spraying and liquid-conveying component and a spraying head group positioned at the upper part in the absorption tower, wherein the inlet of the spraying and liquid-conveying component is communicated with the slurry outlet, and the outlet of the spraying and liquid-conveying component is communicated with the spraying head group;
and the inlet of the flue gas analysis system is communicated with the flue gas outlet.
Preferably, the pulping system comprises a pulping tank, a first stirrer arranged in the pulping tank, and a real-time weight detector for detecting the weight of the pulping tank, wherein the pulping tank is communicated with the slurry mixing storage tank.
Preferably, the slurry mixing tank comprises a holding tank and a second agitator disposed within the holding tank; one side of the storage tank is communicated with the pulping system, and the other side of the storage tank is communicated with the slurry inlet.
Preferably, the flue gas supply system comprises a first flue gas tank, a second flue gas tank and a flue gas flow controller, the two flue gas tanks are respectively communicated with a gas inlet of the flue gas flow controller, and a gas outlet of the flue gas flow controller is communicated with a flue gas inlet.
Preferably, the oxygen supply system comprises an oxygen cylinder, and an air outlet of the oxygen cylinder is provided with a flow regulating valve.
Preferably, the spray header group comprises at least an upper layer of spray headers and a lower layer of spray headers.
Preferably, the inlet of the spray header group in the slurry spraying system is provided with a valve.
Preferably, the real-time weight detector is located at the bottom of the pulping tank.
Preferably, the slurry outlet is disposed on a side of the absorber tower remote from the slurry inlet.
Preferably, the circulating transfusion part is a circulating pump.
Preferably, the pH detection device is connected with a circulating pump in series.
Preferably, the flue gas analysis system is a flue gas analyzer.
Preferably, the inlet of the spray header group in the slurry spraying system is provided with a valve.
The working principle is as follows:
the first desulfurizer and the second desulfurizer are respectively slurried and stored in two slurrying tanks, a mixed desulfurizer slurry is prepared in a slurry mixing storage tank according to a certain proportion through a real-time weight detector, and the slurry is stirred by a second stirrer to be uniformly mixed and then pumped into an absorption tower through a slurry inlet. Sulfur dioxide gas is contained in the first smoke tank, nitrogen gas is contained in the second smoke tank, the two gases are mixed according to a certain proportion through a smoke flow controller, and simulated waste gas is discharged into the absorption tower. Blowing oxygen in the oxygen storage tank into the absorption tower to ensure that the desulfurization product CaSO3Are all oxidized into CaSO4. The mixed desulfurizer slurry is continuously circulated in the absorption tower through a circulating pump, so that the components are ensured to be uniform and no layering occurs. The mixed desulfurizer slurry is sprayed out from top to bottom from a slurry outlet pump to a spray header group through a slurry spraying system to carry out desulfurization treatment on the flue gas. The pH detection device can detect the pH change of the slurry in real time. And the desulfurized flue gas enters a flue gas analyzer through a flue gas outlet at the top of the absorption tower, and the flue gas analyzer detects the sulfur dioxide content of the flue gas. And the waste liquid in the absorption tower is discharged from a liquid outlet.
Compared with the prior art, the invention has the beneficial effects that:
the device provided by the invention can test the influence of different impurities contained in the desulfurization ash on the desulfurization absorption efficiency, the influence of different ratios of desulfurization ash and limestone powder on the pH value of the mixed desulfurizer slurry and the influence of flue gas with different sulfur dioxide concentrations on the desulfurization efficiency in wet desulfurization. In addition, the influence of different mixed desulfurizer slurry flow rates on the pH of the slurry can be tested by detecting the weight of the pulping tank through a real-time weight detector in the desulfurizer supply system.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", and the like, if any, are used in the orientations and positional relationships indicated in the drawings only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationships in the drawings are used for illustrative purposes only and are not to be construed as limiting the present patent.
Furthermore, if the terms "first," "second," and the like are used for descriptive purposes only, they are used for mainly distinguishing different devices, elements or components (the specific types and configurations may be the same or different), and they are not used for indicating or implying relative importance or quantity among the devices, elements or components, but are not to be construed as indicating or implying relative importance.
Example 1
The embodiment provides a mixed desulfurizer wet desulphurization performance testing device, a schematic diagram of which is shown in fig. 1, and the device comprises an absorption tower 5, a desulfurizer supply system 1, a circulating infusion component 6, a pH detection device 7 for testing the pH of slurry in the absorption tower, a flue gas supply system 3, an oxygen supply system 4, a slurry spraying system 8 and a flue gas analysis system 9.
Wherein the absorption tower is provided with a slurry inlet 23, a flue gas inlet 34, an oxygen inlet 41, a slurry outlet 81, a flue gas outlet 91 and a liquid outlet 10; wherein the slurry inlet 23, the flue gas inlet 34, the oxygen inlet 41 and the slurry outlet 81 are positioned at the lower part of the absorption tower, and the flue gas outlet 91 is positioned at the top of the absorption tower 5; the liquid outlet 10 is positioned at the bottom of the absorption tower 5.
The desulfurizer supply system 1 comprises two slurry making systems 11 and a slurry mixing tank 2, wherein the slurry making systems 11 are communicated with one side of the slurry mixing tank 1, and the other side of the slurry mixing tank 2 is communicated with a slurry inlet 23. The pulping system 11 comprises a pulping tank 12, a first stirrer 13 in the pulping tank, and a real-time weight detector 14 for testing the weight of the pulping tank, wherein the real-time weight detector 14 is positioned at the bottom of the pulping tank 12, and the pulping tank 12 is communicated with one side of a pulp mixing storage tank 2. When the slurry is used, one of the slurry making tanks stores limestone powder slurry, and the other slurry making tank stores desulfurized ash slurry or desulfurized ash slurry containing impurities.
The circulating transfusion part 6 is a circulating pump, the inlet of the circulating pump is communicated with the bottom in the absorption tower 5, the outlet of the circulating pump is communicated with the lower part in the absorption tower 5, and the outlet of the circulating pump is higher than the inlet.
The flue gas supply system 3 comprises a first flue gas tank 31, a second flue gas tank 32 and a flue gas flow controller 33, the two flue gas tanks are respectively communicated with a gas inlet of the flue gas flow controller 33, and a gas outlet of the flue gas flow controller is communicated with a flue gas inlet 34. When the device is used, the first flue gas tank stores sulfur dioxide gas, and the second flue gas tank stores nitrogen gas.
The gas outlet of the oxygen supply system 4 communicates with the oxygen inlet 41. The oxygen supply system 4 comprises an oxygen cylinder, and the outlet of the oxygen cylinder is provided with a flow meter 42.
The slurry spraying system 8 comprises a spraying and liquid-conveying component and a spray header group 82 positioned at the upper part in the absorption tower, wherein the inlet of the spraying and liquid-conveying component is communicated with a slurry outlet 81, and the outlet of the spraying and liquid-conveying component is communicated with the spray header group 82; wherein the slurry outlet is arranged on one side of the absorption tower far away from the slurry inlet.
The flue gas analysis system 9 is a flue gas analyzer, and an inlet thereof is communicated with the flue gas outlet 91.
The spray header group 82 comprises an upper layer of spray headers and a lower layer of spray headers, and a valve is arranged at the inlet of the spray header group 82.
Application example 1
The application example provides an application scheme of the wet desulphurization performance testing device of the mixed desulfurizer of the embodiment 1, and the application scheme comprises the following specific steps:
s1, preparing and uniformly mixing calcium hydroxide, calcium carbonate, calcium sulfite and calcium oxide according to a certain proportion, and adding a certain amount of single impurities to prepare a desulfurized fly ash sample with determined component content;
s2, taking the desulfurized ash containing impurities and industrial limestone powder as a first desulfurizer and a second desulfurizer, and pulping in two pulping systems respectively;
s3, weighing a certain total amount of desulfurized fly ash slurry, mixing the desulfurized fly ash slurry with limestone powder slurry in a slurry mixing storage tank according to a certain proportion to prepare mixed desulfurizer slurry, and pumping the mixed desulfurizer slurry into an absorption tower at a certain flow rate;
s4, controlling the test simulation flue gas proportion by a flue gas mixing device, introducing simulation flue gas, introducing oxygen, starting a circulating pump and a slurry spraying system, and detecting the sulfur dioxide concentration of a sulfur dioxide measuring interface by a flue gas analyzer after the reaction is stable;
s5, changing the adding proportion and the types of the impurities, and repeating the steps;
and S6, analyzing the influence of the impurities in the desulfurized ash on the desulfurization absorption efficiency by comparing and analyzing the concentration of the sulfur dioxide in the sulfur dioxide measuring interface.
Wherein the impurities include: SiO 22、Al2O3、Fe2O3MgO and CaCl2Etc.; the limestone powder slurry in the mixed desulfurizer slurry accounts for 50 percent; the concentration of the mixed desulfurizer slurry is 20%; controlling the flow rate of the mixed desulfurizer slurry according to the pH value of the absorption tower, and detecting the pH value of the absorption tower slurry by a pH detection device to be 5.0-5.8; flue gas mixing device controls 500mg/Nm of simulated flue gas sulfur dioxide concentration3(ii) a Simulating 10 times of the flow rate surplus coefficient of the flue gas; the oxygen amount and the liquid level are controlled according to the size of the device.
Six impurities are respectively tested, and the specific addition amount of each impurity is gradually increased according to the influence on the desulfurization reaction until a test conclusion can be obtained. And finally determining the influence curve of the six impurity proportions on the desulfurization efficiency according to the ratio of the impurities to the mass sum of the desulfurization ash and the limestone.
Application example 2
The application example provides an application scheme of the wet desulphurization performance testing device of the mixed desulfurizer of the embodiment 1, and the application scheme comprises the following specific steps:
s1, drying and sieving desulfurized ash and industrial limestone powder to serve as a first desulfurizer and a second desulfurizer, and pulping in two pulping systems respectively;
s2, weighing a certain total amount of desulfurized fly ash slurry, mixing the desulfurized fly ash slurry with limestone powder slurry in a slurry mixing storage tank according to a certain proportion to prepare mixed desulfurizer slurry, and pumping the mixed desulfurizer slurry into an absorption tower at a certain flow rate;
s3, controlling the test simulation flue gas proportion by a flue gas mixing device, introducing simulation flue gas, introducing oxygen, starting a circulating pump and a slurry spraying system, and detecting the pH change of slurry by a pH detection device after the reaction is stable;
s4, changing the proportion of the desulfurization ash slurry in the mixed desulfurizer slurry, and repeating the steps;
and S5, analyzing the pH change of the slurry detected by the pH detection device to obtain the influence of different proportions of desulfurized fly ash and limestone powder on the pH of the slurry of the mixed desulfurizer.
Wherein, the ratio of the desulfurization mortar liquid in the test mixed desulfurizer slurry is respectively as follows: 0%, 25%, 50%, 75%, 100%; the concentration of the mixed desulfurizer slurry is 20%; the flow rate of the mixed desulfurizer slurry is 0.05 t/h; flue gas mixing device for controlling concentration of sulfur dioxide in simulated flue gas to be 1000mg/m3(ii) a The oxygen flow rate was 200 ml/min.
Through different mixing ratios of the mixed desulfurizing agents and the change of the pH value of the slurry detected by a pH detection device, the impact change rule of the mixing ratios of the different mixed desulfurizing agents to the pH value of the slurry in the absorption tower is finally determined.
Application example 3
The application example provides an application scheme of the device for testing the wet desulphurization performance of the mixed desulfurizer in the embodiment 1, and the specific steps are the same as those of the application example 2.
Wherein, the flow rates of the slurry of the mixed desulfurizer are respectively tested as follows: 0.05t/h, 0.1t/h, 0.15t/h and 0.2 t/h; the ratio of the desulfurized ash slurry in the mixed desulfurizer slurry is 50 percent; the concentration of the mixed desulfurizer slurry is 20%; flue gas mixing device for controlling concentration of sulfur dioxide in simulated flue gas to be 1000mg/m3(ii) a The oxygen flow rate was 200 ml/min.
Through setting different slurry inflow flow rates of the mixed desulfurizer and the change of the pH of the slurry detected by the pH detection device, the impact change rule of the slurry flow rates of the different mixed desulfurizer on the pH of the slurry in the absorption tower and the influence on the desulfurization reaction are finally determined.
Application example 4
The application example provides an application scheme of the wet desulphurization performance testing device of the mixed desulfurizer of the embodiment 1, and the application scheme comprises the following specific steps:
s1, drying and sieving desulfurized ash and industrial limestone powder to serve as a first desulfurizer and a second desulfurizer, and pulping in two pulping systems respectively;
s2, weighing a certain total amount of desulfurized fly ash slurry, mixing the desulfurized fly ash slurry with limestone powder slurry in a slurry mixing storage tank according to a certain proportion to prepare mixed desulfurizer slurry, and pumping the mixed desulfurizer slurry into an absorption tower at a certain flow rate;
s3, controlling the test simulation flue gas proportion by a flue gas mixing device, introducing simulation flue gas, introducing oxygen, starting a circulating pump and a slurry spraying system, and detecting the sulfur dioxide concentration of a sulfur dioxide measurement interface in real time by a flue gas analyzer;
s4, changing the simulated flue gas proportion and repeating the steps;
and S5, analyzing and simulating the influence of different sulfur dioxide concentrations in the flue gas on the desulfurization absorption efficiency by comparing the sulfur dioxide concentrations of the sulfur dioxide measurement interfaces.
Wherein, the concentration of sulfur dioxide in the simulated flue gas is controlled and tested by the flue gas mixing device and is respectively: 200mg/m3、 500mg/m3、1000mg/m3、1500mg/m3、1800mg/m3、2000mg/m3(ii) a The proportion of the desulfurization mortar liquid in the mixed desulfurizer slurry is 50 percent; the concentration of the mixed desulfurizer slurry is 20%; the flow rate of the mixed desulfurizer slurry inflow is controlled according to the pH value of the absorption tower, and the pH value of the absorption tower is detected by a pH detection device and is controlled to be 5.0-6.0; the oxygen flow rate was 200 ml/min.
Simulated flue gas with different sulfur dioxide concentrations is blown in, and the flue gas analyzer detects the concentration change of sulfur dioxide in the flue gas of the sulfur dioxide measuring interface in real time, so that the influence curve of the flue gas with different sulfur dioxide concentrations on the desulfurization efficiency is finally determined.
It should be understood that the above-described embodiments and applications of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A testing device for wet desulphurization performance of a desulfurizer is characterized by comprising:
the absorption tower (5) is provided with a slurry inlet (23), a flue gas inlet (34), an oxygen inlet (41), a slurry outlet (81), a flue gas outlet (91) and a liquid outlet (10); the slurry inlet (23), the flue gas inlet (34), the oxygen inlet (41) and the slurry outlet (81) are positioned at the lower part of the absorption tower (5), and the flue gas outlet (91) is positioned at the top of the absorption tower (5); the liquid outlet (10) is positioned at the bottom of the absorption tower (5);
the desulfurizer supply system (1), the desulfurizer supply system (1) comprises at least two pulping systems (11) and a slurry mixing storage tank (2), the pulping systems (11) are communicated with one side of the slurry mixing storage tank (2), and the other side of the slurry mixing storage tank (2) is communicated with a slurry inlet (23);
the inlet of the circulating transfusion part (6) is communicated with the inner bottom of the absorption tower (5), the outlet of the circulating transfusion part (6) is communicated with the inner lower part of the absorption tower (5), and the outlet of the circulating transfusion part (6) is higher than the inlet;
a pH detection device (7) for testing the pH of the slurry in the absorption tower (5);
the gas outlet of the flue gas supply system (3) is communicated with the flue gas inlet (34);
an oxygen supply system (4), wherein an air outlet of the oxygen supply system (4) is communicated with an oxygen inlet (41);
the slurry spraying system (8) comprises a spraying and liquid-conveying part and a spraying head group (82) positioned at the upper part in the absorption tower, the inlet of the spraying and liquid-conveying part is communicated with a slurry outlet (81), and the outlet of the spraying and liquid-conveying part is communicated with the spraying head group (82);
and the inlet of the flue gas analysis system (9) is communicated with the flue gas outlet (91).
2. The desulfurizing agent wet desulphurization performance testing device according to claim 1, wherein the slurrying system (11) comprises a slurrying tank (12), a first stirrer (13) arranged in the slurrying tank (12), and a real-time weight detector (14) for detecting the weight of the slurrying tank (12), and the slurrying tank (12) is communicated with the slurry mixing storage tank (2).
3. The desulfurization agent wet desulfurization performance testing device according to claim 1, wherein the slurry mixing tank (2) comprises a storage tank (21) and a second stirrer (22) disposed in the storage tank (21); one side of the storage tank (21) is communicated with the pulping system (11), and the other side of the storage tank is communicated with the slurry inlet (23).
4. The desulfurization agent wet desulfurization performance testing device according to claim 1, wherein the flue gas supply system (3) comprises a first flue gas tank (31), a second flue gas tank (32) and a flue gas flow controller (33), the two flue gas tanks are respectively communicated with a gas inlet of the flue gas flow controller, and a gas outlet of the flue gas flow controller is communicated with a flue gas inlet (34).
5. The desulfurization agent wet desulfurization performance testing device according to claim 1, wherein the spray header group (82) comprises at least upper and lower spray headers.
6. The desulfurization agent wet desulfurization performance testing device according to claim 1 or 5, wherein a valve is provided at an inlet of the spray header group (82) in the slurry spray system.
7. The desulfurization agent wet desulfurization performance testing device according to claim 2, wherein the real-time weight detector (14) is located at the bottom of the slurrying tank (12).
8. The desulfurization agent wet desulfurization performance testing device according to claim 1, wherein the slurry outlet (81) is disposed on a side of the absorption tower away from the slurry inlet (23).
9. The desulfurization performance testing device according to claim 1, wherein the circulating fluid-feeding component (6) is a circulating pump.
10. The desulfurization performance testing device of claim 1, wherein the flue gas analysis system (9) is a flue gas analyzer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113750761A (en) * | 2021-08-10 | 2021-12-07 | 东南大学 | Method for preparing wet desulfurizing agent by using semidry desulfurization ash and application |
| CN115032330A (en) * | 2021-12-28 | 2022-09-09 | 大连亚泰科技新材料股份有限公司 | Testing machine for testing desulfurization effect of desulfurizing agent |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113750761A (en) * | 2021-08-10 | 2021-12-07 | 东南大学 | Method for preparing wet desulfurizing agent by using semidry desulfurization ash and application |
| CN115032330A (en) * | 2021-12-28 | 2022-09-09 | 大连亚泰科技新材料股份有限公司 | Testing machine for testing desulfurization effect of desulfurizing agent |
| CN115032330B (en) * | 2021-12-28 | 2023-08-04 | 大连亚泰科技新材料股份有限公司 | Desulfurizing agent desulfurization effect detection testing machine |
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