A test apparatus for tail gas absorption scrubbing systems

Abstract

The present application relates to the technical field of testing, in particular to a kind of test equipment for tail gas absorption washing system, for the sulfur dioxide processing efficiency test of tail gas absorption washing system, including identical first glass gas scrubber and second glass gas scrubber, first glass gas scrubber and second glass gas scrubber respectively install the first flowmeter and the second flowmeter of the reactant consumption amount of detection and reaction with sulfur dioxide, the input end and the output end of the tail gas absorption washing system are respectively installed with air inlet pipe and air outlet pipe, air inlet pipe and the input end of the first glass gas scrubber are fixedly installed with first gas branch pipe, the input end of the second glass gas scrubber is fixedly installed with second gas branch pipe between air outlet pipe, third gas branch pipe and second gas branch pipe are respectively fixedly installed with third flowmeter and fourth flowmeter of detection inlet gas volume.

Description

Technical Field

[0001] This invention relates to the field of testing technology, and more specifically to a testing device for an exhaust gas absorption and scrubbing system. Background Technology

[0002] Exhaust gas absorption scrubbing systems are commonly used in industrial production to treat waste gases and to detect vehicle exhaust. They remove harmful gases such as sulfur dioxide, nitrogen oxides, and particulate matter. Their main working principle is to fully contact the waste gas with a scrubbing liquid, utilizing dissolution, adsorption, and chemical reactions to convert harmful substances in the waste gas into harmless substances. The key to testing such equipment is ensuring its treatment efficiency, operational stability, and compliance with environmental regulations. Typically, a desulfurization efficiency of ≥90% is required.

[0003] Treatment efficiency testing requires the use of a gas analyzer with sampling ports at the inlet and outlet of the equipment. The concentrations of pollutants in the inlet and outlet gases are compared, and a simulation of continuous operation for 72 hours is conducted to roughly determine the treatment efficiency. If accurate testing is required, the inlet and outlet gases must be sampled and sent to an inspection agency for detailed testing. This invention aims to provide a new testing device that can achieve on-site testing without the need for a gas analyzer, shortening the testing time while roughly determining the treatment efficiency of sulfur dioxide.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to design a device that can quickly test the exhaust gas absorption and scrubbing system on-site without the need for a gas analyzer, and roughly determine its sulfur dioxide treatment efficiency, in order to solve the above-mentioned shortcomings in the technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a testing device for a tail gas absorption and scrubbing system, used for testing the sulfur dioxide treatment efficiency of the tail gas absorption and scrubbing system, comprising a first glass gas scrubber and a second glass gas scrubber having the same sulfur dioxide treatment efficiency, a first flow meter and a second flow meter respectively installed on the first glass gas scrubber and the second glass gas scrubber to detect the consumption of reactants reacting with sulfur dioxide, an inlet pipe and an outlet pipe respectively installed at the input end and the output end of the tail gas absorption and scrubbing system, a first gas distribution pipe detachably installed from the inlet pipe fixedly installed at the input end of the first glass gas scrubber, a switching valve installed on the first gas distribution pipe, a standard gas source of SO2 standard gas of a certain concentration installed at the input end of the switching valve, a second gas distribution pipe detachably installed from the outlet pipe fixedly installed at the input end of the second glass gas scrubber, a third flow meter and a fourth flow meter respectively fixedly installed on the first gas distribution pipe and the second gas distribution pipe; The same exhaust gas is treated by an exhaust gas absorption and scrubbing system and a first glass gas scrubber. Then, the gas treated by the exhaust gas absorption and scrubbing system is treated a second time by a second glass gas scrubber. The treatment efficiency of the exhaust gas absorption and scrubbing system is calculated by combining the values ​​of the first flow meter, the second flow meter, the third flow meter, and the fourth flow meter.

[0007] Preferably, the first flow meter and the second flow meter are mass flow meters; their model number is ABB AOI 1000.

[0008] Preferably, the third and fourth flow meters are volumetric flow meters; their model number is SiemensFLOWiQ.

[0009] Preferably, the reactant that reacts with sulfur dioxide in the first glass gas scrubber and the second glass gas scrubber is CaCO3.

[0010] Preferably, a first regulating valve and a second regulating valve are fixedly installed on the first air distribution pipe and the second air distribution pipe.

[0011] Preferably, the first and second air distribution pipes are of the same length, and the connection point between the second air distribution pipe and the outlet pipe is close to the output end of the exhaust gas absorption and washing system.

[0012] Preferably, the gas volumes entering the first glass gas scrubber and the second glass gas scrubber are the same.

[0013] Preferably, a one-way valve is installed at the end of the exhaust pipe that is away from the exhaust gas absorption and washing system and the second gas distribution pipe.

[0014] The technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. The present invention introduces the exhaust gas to be treated into the exhaust gas absorption and scrubbing system and the first glass gas scrubber for reaction, and then introduces a portion of the gas treated by the exhaust gas absorption and scrubbing system into the second glass gas scrubber for reaction. The sulfur dioxide treatment efficiency of the exhaust gas absorption and scrubbing system is calculated using the values ​​on the first flow meter, the second flow meter, the third flow meter and the fourth flow meter. 2. With the gas volume entering the first and second glass gas scrubbers being the same, the third and fourth flow meters can be eliminated, and the sulfur dioxide treatment efficiency of the exhaust gas absorption and scrubbing system can be directly calculated using the formula η = 1 - (N*Q1) / (M*Q2), further reducing the installation of components. 3. The present invention does not have specific requirements on the volume of gas entering the first glass gas scrubber and the second glass gas scrubber. Therefore, the size of the two can be adjusted according to one's own needs to change the volume of gas entering. 4. Compared with the existing technology that uses two gas analyzers to compare the concentration of pollutants in the inlet and outlet gases and conducts 72 hours of continuous operation testing, the present invention has two advantages: First, it eliminates the need for 72 hours of continuous operation testing, yet still yields an approximate treatment efficiency, thus shortening the testing time. Second, it also allows for on-site testing. Only when the test results are very close to a desulfurization efficiency of ≥90% can a decision be made on whether to sample the inlet and outlet gases for detailed testing at an inspection agency, enabling rapid preliminary screening of qualified products for the tail gas absorption and scrubbing system. 5. The present invention has a simple structure, and the components and other products used are mature technologies in the prior art. It can be manufactured simply by purchasing standard parts and assembling them, which reduces production costs compared to non-standard parts. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Exhaust gas absorption and scrubbing system; 2. First glass gas scrubber; 3. Second glass gas scrubber; 4. First flow meter; 5. Second flow meter; 6. Inlet pipe; 7. Outlet pipe; 8. First gas distribution pipe; 9. Second gas distribution pipe; 10. Third flow meter; 11. Fourth flow meter; 12. First regulating valve; 13. Second regulating valve; 14. Check valve; 15. Switching valve; 16. Standard gas source. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0020] This invention provides, for example Figure 1 The diagram shows a testing device for a tail gas absorption and scrubbing system, used to test the sulfur dioxide treatment efficiency of tail gas absorption and scrubbing system 1. It includes a first glass gas scrubber 2 and a second glass gas scrubber 3. Glass gas scrubbers are mature products in the prior art, suitable for laboratories or small-scale applications, and are relatively small in size, so they are not described in detail here. This invention uses them for easy portability with a trolley for on-site testing. The first glass gas scrubber 2 and the second glass gas scrubber 3 are respectively equipped with a first flow meter 4 and a second flow meter 5 to detect the consumption of reactants reacting with sulfur dioxide. The reactant reacting with sulfur dioxide is CaCO3. Ideally, this reactant should be the same as the reactant in tail gas absorption and scrubbing system 1; for ease of understanding, it is uniformly set to CaCO3. The reaction formula is: SO2 + CaCO3 + 1 / 2H2O → CaSO3↓ + CO2↑ + 1 / 2H2O. The first flow meter 4 and the second flow meter 5 are mass flow meters used to detect the consumption of CaCO3 in the first glass gas scrubber 2 and the second glass gas scrubber 3, with a molar ratio of 1 mol SO2 consuming 1 mol of CaCO3. CaCO3.

[0021] An inlet pipe 6 and an outlet pipe 7 are respectively installed at the input and output ends of the exhaust gas absorption and scrubbing system 1. The inlet pipe 6 is used to introduce the sulfur dioxide-containing gas that the exhaust gas absorption and scrubbing system 1 needs to treat. A first gas distribution pipe 8, which is detachably installed from the inlet pipe 6, is fixedly installed at the input end of the first glass gas scrubber 2. A switching valve 15 is installed on the first gas distribution pipe 8. A standard gas source 16 with a specific concentration of SO2 standard gas is installed at the input end of the switching valve 15. A second gas distribution pipe 9, which is detachably installed from the outlet pipe 7, is fixedly installed at the input end of the second glass gas scrubber 3. A third flow meter 10 and a fourth flow meter 11, which detect the intake volume, are respectively fixedly installed on the first gas distribution pipe 8 and the second gas distribution pipe 9. The detected values ​​are denoted as F and G, respectively. A first regulating valve 12 and a second regulating valve 13 are fixedly installed on the first gas distribution pipe 8 and the second gas distribution pipe 9 to ensure that the gas volume entering the first glass gas scrubber 2 and the second glass gas scrubber 3 is the same, which is convenient for calculation. The first gas distribution pipe 8 and the second gas distribution pipe 9 are of the same length. The connection between the second gas distribution pipe 9 and the outlet pipe 7 is close to the output end of the exhaust gas absorption and scrubbing system 1, which is also to ensure that gas enters the first glass gas scrubber 2 and the second glass gas scrubber 3 at the same time. A one-way valve 14 is installed at the end of the outlet pipe 7 away from the exhaust gas absorption and scrubbing system 1 and the second gas distribution pipe 9. The one-way valve 14 is used to prevent external gas from entering the second gas distribution pipe 9 from the outlet pipe 7, so as to ensure the accuracy of the detection.

[0022] Before the test, SO2 standard gas of a certain concentration in the standard gas source 16 is injected into the first gas distribution pipe 8 through the switching valve 15. The concentration of SO2 standard gas is C1. It enters the first glass gas scrubber 2 through the first regulating valve 12 and the third flow meter 10. Combined with the specific flow rate Q1 detected by the third flow meter 10 and the absorption dose M consumed in this process measured by the first flow meter 4, the proportional coefficient k of "absorbent consumption - pollutant concentration" of the first glass gas scrubber 2 in the current state is calculated as k = M / (C1 * Q1). According to the calibration coefficient k, the absorption dose consumed to process a certain mass of pollutants is fixed. Therefore, the mass of pollutants captured is W1 = M / k.

[0023] Since the first glass gas scrubber 2 and the second glass gas scrubber 3 have the same sulfur dioxide treatment efficiency, the proportional coefficient of the second glass gas scrubber 3 is also k. The treatment efficiency of the tail gas absorption scrubbing system 1 is unknown and needs to be tested, so it is set as η. The value N detected by the second flow meter 5 and the value Q2 detected by the fourth flow meter 11 are also given. The mass of pollutants captured is W2 = N / k. During testing, personnel moved the equipment to the exhaust gas absorption and scrubbing system 1 and installed it. Then, they operated the switching valve 15 to simultaneously introduce SO2 standard gas with a concentration of C1 from the standard gas source 16 into the inlet pipe 6 and the first gas distribution pipe 8. The SO2 standard gas with a concentration of C1 was introduced into the exhaust gas absorption and scrubbing system 1 through the inlet pipe 6 for treatment. After treatment, the primary treated gas was obtained. After running for a period of time, the air in the outlet pipe 7 of the primary treated gas was discharged through the one-way valve 14. At this time, the first regulating valve 12 and the second regulating valve 13 were opened to control the volume of gas entering. At this time, SO2 standard gas with a concentration of C1 enters the first glass gas scrubber 2 through the first gas distribution pipe 8 and the third flow meter 10 to react, while the gas to be treated at the first time enters the second glass gas scrubber 3 through the second gas distribution pipe 9 and the fourth flow meter 11 to react. After the first glass gas scrubber 2, the second glass gas scrubber 3 and the tail gas absorption and scrubbing system 1 have been working for a predetermined time, the first regulating valve 12 and the second regulating valve 13 are closed, and the values ​​M, N, Q1 and Q2 are observed to start calculating the sulfur dioxide treatment efficiency of the tail gas absorption and scrubbing system 1. Since k = M / (C1*Q1), C1 = (M / k) / Q1. The concentration of SO2 gas in the primary treated gas by the exhaust gas absorption and scrubbing system 1 is C2 = (N / k) / Q2. Because it is a split test, the gas concentrations in the inlet pipe 6 and the first split pipe 8 are the same. Therefore, the total efficiency η of the exhaust gas treatment system under test is: η = 1 - (C2 / C1) = 1 - [(N / k) / Q2] / [(M / k) / Q1] = 1 - (N*Q1) / (M*Q2). This can be used to roughly determine the treatment efficiency of the exhaust gas absorption and scrubbing system 1. Based on whether the actual situation is close to the near-desulfurization efficiency ≥90%, a decision can be made on whether to go to the testing agency for detailed testing and quickly conduct a preliminary screening of qualified exhaust gas absorption and scrubbing systems.

[0024] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), installation arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application.

Claims

1. A testing device for a tail gas absorption and scrubbing system, used for testing the sulfur dioxide treatment efficiency of the tail gas absorption and scrubbing system (1), characterized in that: The system includes a first glass gas scrubber (2) and a second glass gas scrubber (3) with the same sulfur dioxide treatment efficiency. The first glass gas scrubber (2) and the second glass gas scrubber (3) are respectively equipped with a first flow meter (4) and a second flow meter (5) to detect the consumption of reactants reacting with sulfur dioxide. The input and output ends of the tail gas absorption and scrubbing system (1) are respectively equipped with an inlet pipe (6) and an outlet pipe (7). The input end of the first glass gas scrubber (2) is fixedly equipped with a first gas distribution pipe (8) that can be detached from the inlet pipe (6). The first gas distribution pipe (8) is equipped with a switching valve (15). The input end of the switching valve (15) is equipped with a standard gas source (16) that inputs SO2 standard gas of a certain concentration. The input end of the second glass gas scrubber (3) is fixedly equipped with a second gas distribution pipe (9) that can be detached from the outlet pipe (7). The first gas distribution pipe (8) and the second gas distribution pipe (9) are respectively fixedly equipped with a third flow meter (10) and a fourth flow meter (11) to detect the intake volume.

2. The testing equipment for a tail gas absorption and scrubbing system according to claim 1, characterized in that: The first flow meter (4) and the second flow meter (5) are mass flow meters.

3. The testing equipment for a tail gas absorption and scrubbing system according to claim 1, characterized in that: The third flow meter (10) and the fourth flow meter (11) are volumetric flow meters.

4. The testing equipment for a tail gas absorption and scrubbing system according to claim 1, characterized in that: The reactants that react with sulfur dioxide in the first glass gas scrubber (2) and the second glass gas scrubber (3) include CaCO3 or the same alkaline absorbent as the tail gas absorption scrubbing system.

5. The testing equipment for a tail gas absorption and scrubbing system according to claim 1, characterized in that: A first regulating valve (12) and a second regulating valve (13) are fixedly installed on the first gas distribution pipe (8) and the second gas distribution pipe (9).

6. The testing equipment for a tail gas absorption and scrubbing system according to claim 1, characterized in that: The first gas distribution pipe (8) and the second gas distribution pipe (9) are of the same length, and the connection between the second gas distribution pipe (9) and the outlet pipe (7) is close to the output end of the exhaust gas absorption and washing system (1).

7. The testing equipment for a tail gas absorption and scrubbing system according to claim 1, characterized in that: The gas volumes entering the first glass gas scrubber (2) and the second glass gas scrubber (3) are the same.

8. The testing equipment for a tail gas absorption and scrubbing system according to claim 1, characterized in that: A one-way valve (14) is installed at the end of the exhaust pipe (7) away from the exhaust gas absorption and washing system (1) and the second gas distribution pipe (9).

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