Testing device for absorption selectivity of SRV furnace gas and use method of testing device
By designing an absorption selectivity test device for SRV furnace gas, the problem of selective absorption of H2S and CO2 in the prior art is solved, and the accurate selection of the absorbed solution is achieved and the processing efficiency is improved.
Patent Information
- Application Number
- CN202411430533.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-02-11
AI Technical Summary
The prior art cannot effectively solve the selective absorption of H2S and CO2 in SRV furnace gas, resulting in a preferential selective relationship in the absorption solution during the treatment process, affecting the treatment effect.
A test device for absorption selectivity of SRV furnace gas is designed. By setting up a first sampling valve and a second sampling valve, sampling is performed separately before the mixed gas enters the absorption tower and after the absorption tower is discharged, it is determined that the absorption solution is H2S. or the absorption effect of CO2, thereby selecting the target absorption solution.
Through this test device, the absorption effect of absorbing solutions with different pH values on H2S and CO2 can be accurately judged, and the appropriate absorption solution can be selected, which improves the selectivity and efficiency of gas treatment in SRV furnaces.
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Figure CN119413952A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of separation and purification of coal gas in a smelting reduction furnace, and in particular to a testing device for absorption selectivity of coal gas in an SRV furnace and a method for using the same. Background Art
[0002] Smelting-reducing ironmaking is a short-process steelmaking process. Smelting-reducing ironmaking uses an SRV furnace (Smelting-Reducing Vessel, SRV for short). SRV furnace gas is a by-product of this process technology, and its H2S content is relatively high. After the high concentration of H2S is burned, a large amount of SO2 will be produced, which will affect human health and the natural environment.
[0003] In the related art, using alkaline solution to absorb H2S in SRV furnace gas is a relatively effective method, and the process flow is relatively mature. However, due to the high concentration of CO2 in SRV furnace gas, and the fact that both CO2 and H2S are weakly acidic gases, there is bound to be a preferential selectivity relationship between the two acidic gases during the absorption operation, but it is currently impossible to select the alkaline solution. Summary of the invention
[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a testing device for the absorption selectivity of SRV furnace gas and a method for using the same, which is convenient for sampling before the mixed gas enters the absorption tower and after it leaves the absorption tower, thereby facilitating the judgment of the absorption effect of the absorption solution on H2S or CO2 according to the sampling results, and thus facilitating the selection of the target absorption solution.
[0005] According to an embodiment of the present application, a testing device for the absorption selectivity of SRV furnace gas includes: a first gas cylinder, a second gas cylinder and a gas mixer, wherein H2S is passed through the first gas cylinder, CO2 is passed through the second gas cylinder, and the gas outlet of the first gas cylinder and the gas outlet of the second gas cylinder are selectively connected to the inlet of the gas mixer respectively; an absorption tower, wherein an absorption solution is passed through the absorption tower and is connected to the outlet of the gas mixer; wherein a first sampling valve is provided between the absorption tower and the outlet of the gas mixer, and a second sampling valve is provided at the gas outlet of the absorption tower.
[0006] According to the test device for the absorption selectivity of SRV furnace gas in the embodiment of the present application, the first gas cylinder and the second gas cylinder can be connected to the inlet of the gas mixer respectively, so that H2S and CO2 can be mixed at the gas mixer to simulate the SRV furnace gas, and by setting the first sampling valve and the second sampling valve, it is convenient to sample the mixed gas before it enters the absorption tower and after it leaves the absorption tower, so as to judge the absorption effect of the absorption solution on H2S or CO2 according to the sampling results, and thus facilitate the selection of the target absorption solution.
[0007] According to some embodiments of the present application, the testing device for the absorption selectivity of SRV furnace gas also includes: a first flow regulating valve, which is arranged between the gas outlet of the first gas cylinder and the inlet of the gas mixer; and a second flow regulating valve, which is arranged between the gas outlet of the second gas cylinder and the inlet of the gas mixer.
[0008] According to some embodiments of the present application, the testing device for the absorption selectivity of SRV furnace gas also includes: a first filter pressure reducer, which is arranged between the first gas cylinder outlet and the first flow regulating valve; and a second filter pressure reducer, which is arranged between the second gas cylinder outlet and the second flow regulating valve.
[0009] According to some embodiments of the present application, the testing device for absorption selectivity of SRV furnace gas further includes: a control component, wherein the first flow regulating valve and the second flow regulating valve are arranged in parallel and are both electrically connected to the control component.
[0010] According to some embodiments of the present application, the test device for the absorption selectivity of SRV furnace gas also includes: a rich liquid tank and a rich liquid pump, the absorption solution is located in the rich liquid tank, and the rich liquid pump is connected between the rich liquid tank and the liquid inlet of the absorption tower; a lean liquid tank, and the lean liquid tank is connected to the liquid outlet of the absorption tower.
[0011] The application also proposes a method for using a testing device for the absorption selectivity of SRV furnace gas.
[0012] According to the method for using the test device for the absorption selectivity of SRV furnace gas according to the embodiment of the present application, the method is applicable to the test device for the absorption selectivity of SRV furnace gas described in any one of the above embodiments, and the method includes: passing the absorption solution with different pH values into the absorption tower; controlling the first gas cylinder and / or the second gas cylinder to be connected to the inlet of the gas mixer; obtaining the pre-absorption proportional concentration of H2S and / or CO2 at the first sampling valve, and obtaining the post-absorption proportional concentration of H2S and / or CO2 at the second sampling valve; and calculating the selectivity of the target absorption solution according to the relationship between the pre-absorption proportional concentration and the post-absorption proportional concentration.
[0013] According to the method for using the test device for the absorption selectivity of SRV furnace gas in some embodiments of the present application, controlling the first gas cylinder and / or the second gas cylinder to be connected to the inlet of the gas mixer includes: controlling the first gas cylinder to be connected to the inlet of the gas mixer, and controlling the second gas cylinder to be closed; or controlling the second gas cylinder to be connected to the inlet of the gas mixer, and controlling the first gas cylinder to be closed; or controlling the first gas cylinder and the second gas cylinder to be connected to the inlet of the gas mixer, respectively.
[0014] According to the method of using the test device for absorption selectivity of SRV furnace gas in some embodiments of the present application, obtaining the pre-absorption proportional concentration of H2S and / or CO2 at the first sampling valve, and obtaining the post-absorption proportional concentration of H2S and / or CO2 at the second sampling valve includes: obtaining a first pre-absorption proportional concentration of H2S at the first sampling valve, and obtaining a first post-absorption proportional concentration of H2S at the second sampling valve; obtaining a second pre-absorption proportional concentration of CO2 at the first sampling valve, and obtaining a second post-absorption proportional concentration of CO2 at the second sampling valve.
[0015] According to the method for using the test device for the absorption selectivity of SRV furnace gas in some embodiments of the present application, the calculation formula for calculating the selectivity of the target absorption solution is:
[0016] m(H2S) = (1-proportional concentration after the first absorption / proportional concentration before the first absorption) × 100%;
[0017] m(CO2)=(1-proportional concentration after the second absorption / proportional concentration before the second absorption)×100%;
[0018] S=m(H2S) / m(CO2), where m represents the absorption rate of the gas and S represents the selectivity.
[0019] According to the method for using the test device for the absorption selectivity of SRV furnace gas in some embodiments of the present application, controlling the connection between the first gas cylinder and / or the second gas cylinder and the inlet of the gas mixer includes: controlling the gas pressure of H2S discharged from the first gas cylinder and / or the gas pressure of CO2 discharged from the second gas cylinder to be the same as the SRV furnace gas pressure.
[0020] The method of using the test device for the absorption selectivity of SRV furnace gas has the same advantages as the above-mentioned test device for the absorption selectivity of SRV furnace gas over the prior art, and will not be repeated here.
[0021] Additional aspects and advantages of the present application will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:
[0023] Figure 1 A schematic diagram of a testing device for absorption selectivity of SRV furnace gas according to some embodiments of the present application;
[0024] Figure 2 A flow chart of a method for using a testing device for absorption selectivity of SRV furnace gas according to some embodiments of the present application.
[0025] Reference numerals:
[0026] Test device 10 for absorption selectivity of SRV furnace gas;
[0027] The first gas cylinder 1; the first pipeline 11; the first bus 12; the first filter pressure reducer 13; the first temperature detection instrument 141; the first pressure detection instrument 142; the first safety valve 15; the first manual relief valve 16; the first metering device 17; the first flow regulating valve 18; the first check valve 19;
[0028] The second gas cylinder 2; the second pipeline 21; the second bus 22; the second filter pressure reducer 23; the second temperature detection instrument 241; the second pressure detection instrument 242; the second safety valve 25; the second manual relief valve 26; the second metering device 27; the second flow regulating valve 28; the second check valve 29;
[0029] Gas mixer 3; first sampling valve 31; mixed gas pipeline 32; second sampling 33;
[0030] Absorption tower 4; lean liquid pipeline 41; lean liquid tank 42; lean liquid level gauge 421; lean and rich liquid heat exchanger 43; rich liquid tank 44; rich liquid level gauge 441; rich liquid pump 45; rich liquid pipeline 46; spray device 47; gas distributor 48; defoamer 49;
[0031] Control component 5; exhaust gas pipeline 61; exhaust gas collecting device 62. DETAILED DESCRIPTION
[0032] In order to better understand the technical solutions provided by the embodiments of this specification, the technical solutions of the embodiments of this specification are described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of this specification and the specific features in the embodiments are detailed descriptions of the technical solutions of the embodiments of this specification, rather than limitations on the technical solutions of this specification. In the absence of conflict, the embodiments of this specification and the technical features in the embodiments can be combined with each other.
[0033] In this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the statement "comprise one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements. The term "more than two" includes two or more than two situations.
[0034] According to the following Figure 1 and Figure 2 The test device 10 for the absorption selectivity of SRV furnace gas and the use method thereof according to an embodiment of the present application are described.
[0035] like Figure 1 As shown, a testing device 10 for absorption selectivity of SRV furnace gas according to an embodiment of the present application includes: a first gas cylinder 1, a second gas cylinder 2 and a gas mixer 3, H2S is passed through the first gas cylinder 1, CO2 is passed through the second gas cylinder 2, and the gas outlet of the first gas cylinder 1 and the gas outlet of the second gas cylinder 2 are selectively connected to the inlet of the gas mixer 3 respectively; an absorption tower 4, an absorption solution is passed through the absorption tower 4 and is connected to the outlet of the gas mixer 3; wherein a first sampling valve 31 is provided between the absorption tower 4 and the outlet of the gas mixer 3, and a second sampling valve 33 is provided at the gas outlet of the absorption tower 4.
[0036] It should be noted that the absorption solution is a solution that can chemically react with H2S and / or CO2. Since H2S and CO2 are both acidic gases, the absorption solution in the embodiment of the present application is an alkaline solution. For example, the absorption solution can be a NaOH solution. Since NaOH solutions with different pH values have different absorption effects on H2S and / or CO2, it is necessary to use the test device 10 for the absorption selectivity of SRV furnace gas of the present application to detect the absorption effects of NaOH solutions with different pH values on H2S and / or CO2, thereby facilitating better selection of NaOH solutions with corresponding pH values when performing SRV gas absorption.
[0037] In actual use, the first gas cylinder 1 and the second gas cylinder 2 can be connected to the inlet of the gas mixer 3 respectively, so that H2S and CO2 can enter the gas mixer 3 respectively, so that H2S and CO2 can be mixed into a mixed gas at the gas mixer 3, thereby simulating SRV furnace gas.
[0038] Furthermore, the mixed gas enters the absorption tower 4 through the outlet of the gas mixer 3. Since the absorption tower 4 is filled with an absorption solution, the absorption solution can chemically react with H2S and / or CO2 to consume part of the H2S and / or CO2 in the mixed gas.
[0039] Furthermore, by setting the first sampling valve 31 and the second sampling valve 33, sampling can be performed before the mixed gas enters the absorption tower 4 and after it exits the absorption tower 4, respectively, so as to facilitate judging the absorption effect of NaOH solutions with different pH values on H2S and / or CO2 according to the sampling results, and thus facilitate better selection of NaOH solutions with corresponding pH values when performing SRV coal gas absorption.
[0040] According to the test device 10 for the absorption selectivity of SRV furnace gas in the embodiment of the present application, the first gas cylinder 1 and the second gas cylinder 2 can be connected to the inlet of the gas mixer 3 respectively, so that H2S and CO2 can simulate the SRV furnace gas, and by setting the first sampling valve 31 and the second sampling valve 33, it is convenient to sample the mixed gas before it enters the absorption tower 4 and after it leaves the absorption tower 4, so as to judge the absorption effect of the absorption solution on H2S or CO2 according to the sampling results, and thus facilitate the selection of the target absorption solution.
[0041] In some embodiments, Figure 1 As shown, the testing device 10 for the absorption selectivity of SRV furnace gas further includes: a first flow regulating valve 18 and a second flow regulating valve 28 .
[0042] The first flow regulating valve 18 is disposed between the gas outlet of the first gas cylinder 1 and the inlet of the gas mixer 3 , and the second flow regulating valve 28 is disposed between the gas outlet of the second gas cylinder 2 and the inlet of the gas mixer 3 .
[0043] Thus, the gas flow rate of H2S discharged from the first gas cylinder 1 can be controlled by the first flow regulating valve 18, and the gas flow rate of CO2 discharged from the second gas cylinder 2 can be controlled by the second flow regulating valve 28, thereby facilitating the adjustment of the ratio of H2S and CO2 in the mixed gas through the first flow regulating valve 18 and the second flow regulating valve 28, so as to better simulate the SRV furnace gas.
[0044] In some embodiments, Figure 1 As shown, the testing device 10 for the absorption selectivity of SRV furnace gas further includes: a first filter pressure reducer 13 and a second filter pressure reducer 23 .
[0045] The first filter pressure reducer 13 is disposed between the gas outlet of the first gas cylinder 1 and the first flow regulating valve 18 , and the second filter pressure reducer 23 is disposed between the gas outlet of the second gas cylinder 2 and the second flow regulating valve 28 .
[0046] Thus, the H2S discharged from the first gas cylinder 1 can be filtered and reduced in pressure through the first filter pressure reducer 13, and the CO2 discharged from the second gas cylinder 2 can be filtered and reduced in pressure through the second flow regulating valve 28, thereby facilitating the adjustment of the pressure of H2S and CO2 in the mixed gas through the first filter pressure reducer 13 and the second filter pressure reducer 23, so as to better simulate the SRV furnace gas.
[0047] In some embodiments, Figure 1 As shown, the testing device 10 for the absorption selectivity of SRV furnace gas further includes: a control component 5 , a first flow regulating valve 18 and a second flow regulating valve 28 which are arranged in parallel and are both electrically connected to the control component 5 .
[0048] Therefore, it is convenient to regulate the first flow regulating valve 18 and the second flow regulating valve 28 respectively through the control component 5, thereby reducing the control difficulty of the first flow regulating valve 18 and the second flow regulating valve 28 and improving the degree of automation.
[0049] In some embodiments, Figure 1 As shown, the testing device 10 for the absorption selectivity of SRV furnace gas further includes: a rich liquid tank 44 , a rich liquid pump 45 and a lean liquid tank 42 .
[0050] The absorption solution is located in the rich liquid tank 44 , the rich liquid pump 45 is connected between the rich liquid tank 44 and the liquid inlet of the absorption tower 4 , and the lean liquid tank 42 is connected to the liquid outlet of the absorption tower 4 .
[0051] Thus, the absorption solution can enter the absorption tower 4 through the rich liquid tank 44 and the rich liquid pump 45 in sequence, so that the absorption solution can chemically react with H2S and / or CO2 to consume part of the H2S and / or CO2 in the mixed gas, and after absorption, the absorption solution can be recovered by using the lean liquid tank 42 to facilitate the recycling of the absorption solution.
[0052] The application also proposes a method for using a testing device for the absorption selectivity of SRV furnace gas.
[0053] The method for using the device for testing the absorption selectivity of SRV furnace gas according to the embodiment of the present application is applicable to the device for testing the absorption selectivity of SRV furnace gas 10 according to any of the above embodiments, such as Figure 2 As shown, the usage includes:
[0054] S10: passing absorption solutions with different pH values into absorption tower 4;
[0055] S20: Control the first gas cylinder 1 and / or the second gas cylinder 2 to be connected to the inlet of the gas mixer 3;
[0056] S30: obtaining the ratio concentration of H2S and / or CO2 before absorption at the first sampling valve 31, and obtaining the ratio concentration of H2S and / or CO2 after absorption at the second sampling valve 33;
[0057] S40: Calculating the selectivity of the target absorption solution according to the relationship between the ratio concentration before absorption and the ratio concentration after absorption.
[0058] It can be understood that the absorption solution is a solution that can chemically react with H2S and / or CO2. Since H2S and CO2 are both acidic gases, the absorption solution in the embodiment of the present application is an alkaline solution. For example, the absorption solution can be a NaOH solution. Since NaOH solutions with different pH values have different absorption effects on H2S and / or CO2, it is necessary to use the test device 10 for the absorption selectivity of SRV furnace gas of the present application to detect the absorption effects of NaOH solutions with different pH values on H2S and / or CO2, thereby facilitating better selection of NaOH solutions with corresponding pH values when performing SRV gas absorption.
[0059] In actual use, the absorption solution with a pH value of 8 can be first introduced into the absorption tower 4, and then the first gas cylinder 1 and the second gas cylinder 2 can be connected to the inlet of the gas mixer 3 respectively, so that H2S and CO2 can enter the gas mixer 3 respectively, so that H2S and CO2 can be mixed into a mixed gas at the gas mixer 3, thereby simulating SRV furnace gas.
[0060] Furthermore, the mixed gas enters the absorption tower 4 through the outlet of the gas mixer 3. Since the absorption tower 4 is filled with an absorption solution, the absorption solution can chemically react with H2S and / or CO2 to consume part of the H2S and / or CO2 in the mixed gas.
[0061] Furthermore, by setting the first sampling valve 31 and the second sampling valve 33, H2S and / or CO2 can be sampled before the mixed gas enters the absorption tower 4 and after it exits the absorption tower 4, respectively, so as to judge the absorption effect of NaOH solutions with different pH values of 8 on H2S and / or CO2 according to the sampling results, and then replace the absorption solution with a pH value of 9, 10 or 11, and repeat the above operation, so as to better select the NaOH solution with the corresponding pH value when performing SRV coal gas absorption.
[0062] In some embodiments, S20: controlling the first gas cylinder 1 and / or the second gas cylinder 2 to be connected to the inlet of the gas mixer 3 comprises:
[0063] The first gas cylinder 1 is controlled to be connected to the inlet of the gas mixer 3, and the second gas cylinder 2 is controlled to be closed. In this way, the absorption solution in the absorption tower 4 can react chemically with H2S to consume part of the H2S in the mixed gas.
[0064] Furthermore, by providing the first sampling valve 31 and the second sampling valve 33, H2S can be sampled before the mixed gas enters the absorption tower 4 and after it exits the absorption tower 4, thereby facilitating the determination of the absorption effect of NaOH solutions with different pH values on H2S based on the sampling results.
[0065] Alternatively, the second gas cylinder 2 is controlled to be connected to the inlet of the gas mixer 3, and the first gas cylinder 1 is controlled to be closed; in this way, the absorption solution in the absorption tower 4 can react chemically with CO2 to consume part of the CO2 in the mixed gas.
[0066] Furthermore, by providing the first sampling valve 31 and the second sampling valve 33, CO2 can be sampled before the mixed gas enters the absorption tower 4 and after it exits the absorption tower 4, thereby facilitating the determination of the absorption effect of NaOH solutions with different pH values on CO2 based on the sampling results.
[0067] Alternatively, the first gas cylinder 1 and the second gas cylinder 2 are controlled to be connected to the inlet of the gas mixer 3. In this way, H2S and CO2 enter the gas mixer 3 respectively, so that H2S and CO2 can be mixed into a mixed gas at the gas mixer 3, thereby simulating SRV furnace gas.
[0068] Furthermore, the mixed gas enters the absorption tower 4 through the outlet of the gas mixer 3. Since the absorption tower 4 is filled with an absorption solution, the absorption solution can chemically react with H2S and CO2 to consume part of the H2S and CO2 in the mixed gas, thereby facilitating the judgment of the absorption effect of NaOH solutions with different pH values on H2S and CO2 based on the sampling results.
[0069] In some embodiments, S30: obtaining the ratio concentration of H2S and / or CO2 before absorption at the first sampling valve 31, and obtaining the ratio concentration of H2S and / or CO2 after absorption at the second sampling valve 33 includes:
[0070] The first pre-absorption proportional concentration of H2S is obtained at the first sampling valve 31, and the first post-absorption proportional concentration of H2S is obtained at the second sampling valve 33; thus, the first post-absorption proportional concentration can be compared with the first pre-absorption proportional concentration to determine the absorption effect of NaOH solutions with different pH values on H2S.
[0071] The second pre-absorption ratio concentration of CO2 is obtained at the first sampling valve 31, and the second post-absorption ratio concentration of CO2 is obtained at the second sampling valve 33. Thus, the second post-absorption ratio concentration can be compared with the second pre-absorption ratio concentration to determine the absorption effect of NaOH solutions with different pH values on CO2.
[0072] In some embodiments, the calculation formula for calculating the selectivity of the target absorption solution is:
[0073] m(H2S) = (1-proportional concentration after the first absorption / proportional concentration before the first absorption) × 100%;
[0074] m(CO2)=(1-proportional concentration after the second absorption / proportional concentration before the second absorption)×100%;
[0075] S=m(H2S) / m(CO2), where m represents the absorption rate of the gas and S represents the selectivity.
[0076] For example, when using an absorption solution with a pH value of 8, S is less than 1, indicating that m(H2S) is less than m(CO2), that is, the proportional concentration after the first absorption / the proportional concentration before the first absorption is greater than the proportional concentration after the second absorption / the proportional concentration before the second absorption. At this time, the absorption solution with a pH value of 8 has a better absorption effect on H2S than on CO2. Therefore, if you want to absorb H2S gas in SRV furnace gas, you can choose an absorption solution with a pH value of 8.
[0077] Or when using an absorption solution with a pH value of 10, S is greater than 1, indicating that m(H2S) is greater than m(CO2), that is, the proportional concentration after the first absorption / the proportional concentration before the first absorption is less than the proportional concentration after the second absorption / the proportional concentration before the second absorption. At this time, the absorption solution with a pH value of 8 has a better absorption effect on CO2 than on H2S. Therefore, if you want to absorb CO2 gas in SRV furnace gas, you can choose an absorption solution with a pH value of 10.
[0078] Of course, the corresponding relationship between the value of S and the absorption solution with different pH values mentioned above is only for illustration and does not represent a limitation thereto.
[0079] In some embodiments, controlling the first gas cylinder 1 and / or the second gas cylinder 2 to communicate with the inlet of the gas mixer 3 comprises:
[0080] The gas pressure of H2S discharged from the first gas cylinder 1 and / or the gas pressure of CO2 discharged from the second gas cylinder 2 are controlled to be the same as the SRV furnace gas pressure, thereby reducing the influence of the pressure difference on the absorption result.
[0081] The following is based on the attached Figure 1 A test device 10 for the absorption selectivity of SRV furnace gas is described in the present application.
[0082] The testing device 10 for the absorption selectivity of the SRV furnace gas comprises: a first gas cylinder 1, a first pipeline 11, a first bus 12, a first filter pressure reducer 13, a first temperature detection instrument 141, a first pressure detection instrument 142, a first safety valve 15, a first manual relief valve 16, a first metering device 17, a first flow regulating valve 18, a first check valve 19, a second gas cylinder 2, a second pipeline 21, a second bus 22, a second filter pressure reducer 23, a second temperature detection instrument 241, and a second pressure detection instrument 242 , a second safety valve 25, a second manual relief valve 26, a second metering device 27, a second flow regulating valve 28, a second check valve 29, a gas mixer 3, a first sampling valve 31, a mixed gas pipeline 32, an absorption tower 4, a lean liquid pipeline 41, a lean liquid tank 42, a lean and rich liquid heat exchanger 43, a rich liquid tank 44, a rich liquid pump 45, a rich liquid pipeline 46, a spray device 47, a gas distributor 48, a demister 49, a lean liquid level gauge 421, a rich liquid level gauge 441, an exhaust gas pipeline 61, a second sampling valve 33 and an exhaust gas collecting device 62.
[0083] The first gas cylinder 1 is filled with H2S gas, the second gas cylinder 2 is filled with CO2 gas, the gas outlet of the first gas cylinder 1 is connected to the gas mixer 3 through the first pipeline 11, and the gas outlet of the second gas cylinder 2 is connected to the gas mixer 3 through the second pipeline 21.
[0084] There can be multiple first gas cylinders 1 and multiple second gas cylinders 2. Multiple first gas cylinders 1 are connected to the first pipeline 11 through the first bus 12, and multiple second gas cylinders 2 are connected to the second pipeline 21 through the second bus 22. On the first pipeline 11, along the transmission direction of the first pipeline 11, a first filter pressure reducer 13, a first temperature detection instrument 141, a first pressure detection instrument 142, a first safety valve 15, a first manual relief valve 16, a first metering device 17, a first flow regulating valve 18 and a first check valve 19 are sequentially arranged.
[0085] The second pipeline 21 is arranged in parallel with the first pipeline 11, and on the second pipeline 21, along the transmission direction of the second pipeline 21, a second filter pressure reducer 23, a second temperature detection instrument 241, a second pressure detection instrument 242, a second safety valve 25, a second manual relief valve 26, a second metering device 27, a second flow regulating valve 28 and a second check valve 29 are sequentially arranged.
[0086] Furthermore, the first gas cylinder 1 and the second gas cylinder 2 are respectively filled with H2S with a purity of ≥99.99 and CO2 with a purity of 25%, and the pressure is 15.0MPa; the first gas cylinder 1 and the second gas cylinder 2 are each group of 2 gas cylinders, and are both equipped with anti-reverse valves, and are respectively connected to the first bus 12 and the second bus 22 with metal hoses; the first bus 12 and the second bus 22 are connected with bus angle valves; the filtration accuracy of the first filter pressure reducer 13 and the second filter pressure reducer 23 are both 80 mesh, and the pressure is reduced from 15.0MPa to 10-15kPa; the first temperature detection instrument 141, the first pressure detection instrument 142, the second temperature detection instrument 2 41. The second pressure detection instrument 242 is installed and displayed locally; the first safety valve 15 and the second safety valve 25 are safety facilities of each gas supply device. When the system is over-pressured, the safety valve automatically opens and releases the pressure. The set pressure of the safety valve is 0.2MPa; after the absorption reaction is completed, the corresponding gas in the pipeline can be vented by opening the first manual relief valve 16 and the second manual relief valve 26; the first metering device 17 and the second metering device 27 are orifice flowmeters or mass flowmeters, and are interlocked with the first flow regulating valve 18 and the second flow regulating valve 28 respectively to control the system flow and the H2S content in the mixed gas. The flow adjustment range is 50Nm 3 / h-80Nm 3 / h; the first check valve 19 and the second check valve 29 can effectively prevent H2S and CO2 from mixing and ensure the safety of gas supply.
[0087] Furthermore, the first pipeline 11 and the second pipeline 21 are connected to the gas mixer 3 in the gas mixer 3 respectively; the gas mixer 3 is connected to the first sampling valve 31 and the mixed gas pipeline 32 in sequence. The first pipeline 11, the second pipeline 21 and the mixed gas pipeline 32 are all made of stainless steel, and the pipe diameter is DN50; an annular nozzle is provided inside the gas mixer 3 to ensure uniform mixing of the gas; the first sampling valve 31 is a stainless steel valve, which is used to measure the gas components before the absorption reaction.
[0088] Furthermore, the mixed gas pipeline 32 is connected to the gas inlet of the absorption tower 4 in the absorption device, and the absorption tower 4, the lean liquid pipeline 41, the lean liquid tank 42, the lean-rich liquid heat exchanger 43, the rich liquid tank 44, the rich liquid pump 45 and the rich liquid pipeline 46 are arranged in sequence in the absorption device; the lean liquid tank 42 and the rich liquid tank 44 are respectively provided with a lean liquid level gauge 421 and a rich liquid level gauge 441; the absorption tower 4 is also arranged with a spray device 47, a gas distributor 48 and a demister 49; the rich liquid pipeline 46 is connected to the spray device 47 inside the absorption tower 4.
[0089] Furthermore, the absorption tower 4 is 900 mm high and 200 mm in diameter, and is also equipped with Raschig ring fillers to increase the gas-liquid contact area between the mixed gas and the absorption liquid and enhance mass transfer; the lean liquid pipeline 41 and the rich liquid pipeline 46 are both made of PE material, and the pipe diameter is DN25; the lean liquid tank 42 and the rich liquid tank 44 are both made of plexiglass material, with a size of 600 mm×600 mm×600 mm; the rich liquid tank 44 is filled with freshly configured NaOH absorption liquid, and the set lean liquid level meter 421 can control the absorption liquid level; the lean liquid tank 42 is filled with NaOH absorption liquid after the gas-liquid absorption reaction, and the set rich liquid level meter 441 can control the absorption liquid level. The lean-rich liquid heat exchanger 43 can convert the NaOH absorption liquid after the gas-liquid absorption reaction into the NaOH absorption liquid for continuing the absorption operation; the rich liquid pump 45 transports the converted NaOH absorption liquid to the spray device 47 in the absorption tower 4, thereby realizing circulation; the spray device 47 is divided into two layers, the upper tower and the middle tower, and a plurality of liquid nozzles are evenly arranged on each layer; the gas distributor 48 is arranged in the lower tower, and a plurality of gas nozzles are evenly arranged; the demister 49 is arranged at the top of the tower to remove liquid droplets entrained in the gas.
[0090] Furthermore, the gas outlet of the absorption tower 4 is connected to the tail gas pipeline 61 in the tail gas collection device 62, and the second sampling valve 33 in the tail gas collection device 62 and the tail gas collection device 62 are sequentially connected by the tail gas pipeline 61. The tail gas pipeline 61 is made of stainless steel with a diameter of DN50; the second sampling valve 33 is a stainless steel valve for measuring the gas components after the absorption reaction; the tail gas collection device 62 is made of organic glass with a size of 600mm×600mm×600mm, and is filled with NaOH absorption liquid to wash the mixed tail gas to completely remove H2S in the tail gas.
[0091] The main steps of a method for using a test device for the absorption selectivity of SRV furnace gas are as follows:
[0092] A. Prepare NaOH absorption solutions with different pH values and add the NaOH absorption solutions into the rich liquid pool 44; the NaOH solution with high pH value is used as the washing liquid in the tail gas collection device 62.
[0093] B. Open the first gas cylinder 1 and the second gas cylinder 2 to provide H2S and CO2 to the system.
[0094] C. Set the H2S and CO2 gas flow, gas pressure, H2S concentration in the mixed gas and other related condition parameters.
[0095] D. H2S, CO2 or mixed gas, as well as NaOH absorption solutions with different pH values are introduced into the absorption tower 4, and the gas and liquid phases contact in the packing layer and react and absorb.
[0096] E. Determine the H2S and CO2 concentrations at the inlet and outlet of absorption tower 4, and analyze the absorption and selectivity of H2S and CO2.
[0097] Preferably, in step A, NaOH absorption solutions with pH values of 8, 9, 10, 11, 12, and 13 are prepared respectively based on the value measured by the pH acidity meter; the NaOH solution with a pH value of 13 is used as the washing liquid in the tail gas collection device 62.
[0098] Preferably, in step B, H2S with a purity of ≥99.99%, CO2 with a purity of 25%, and a mixed gas can be provided to the system. When H2S is supplied alone, the valve on the first gas cylinder 1 is opened, and the angle valve on the first bus 12 is opened synchronously, and the CO2 gas supply device is in a closed state; when CO2 is supplied alone, the valve on the second gas cylinder 2 is opened, and the angle valve on the second bus 22 is opened synchronously, and the H2S gas supply device is in a closed state; when a mixed gas is supplied, the CO2 gas supply device is opened first, and then the H2S gas supply device is opened, and the H2S gas supply device is determined according to the first sampling valve 31. The effective characteristics of the mixed gas simulating SRV furnace gas are ensured.
[0099] Preferably, in step C, the first filter pressure reducer 13 and the second filter pressure reducer 23 are set to reduce the pressure of H2S and CO2 to 10kPa-15kPa respectively, which is consistent with the SRV furnace gas pressure; when the mixed gas is supplied, the H2S content of the mixed gas of the first sampling valve 31 needs to be set to 600ppm, and then the flow parameters of H2S and CO2 are adjusted.
[0100] Preferably, H2S and CO2 need to pass through a filter before decompression, and the filtration accuracy is not greater than 80 mesh.
[0101] Preferably, in step D, three batches of absorption reactions are carried out under the conditions of NaOH absorption solutions with pH values of 8, 9, 10, 11, 12, and 13, respectively; the first batch is a single H2S gas absorption reaction, the second batch is a single CO2 gas absorption reaction, and the third batch is a mixed gas absorption reaction, with a total of 18 groups of absorption reaction units.
[0102] Preferably, after absorption by alkali solution, the calculation formula of the absorption rate m and selectivity S of the corresponding component is as follows:
[0103] m=(1-c 后 / c 前 )×100%;
[0104] S = m(H2S) / m(CO2).
[0105] Where m represents the absorption rate of the corresponding gas, c 后 is the corresponding component concentration measured by the second sampling valve 33, c 前 It is the concentration of the corresponding component measured by the first sampling valve 31.
[0106] For example: m(H2S) = (1-proportional concentration after the first absorption / proportional concentration before the first absorption) × 100%;
[0107] m(CO2)=(1-proportional concentration after the second absorption / proportional concentration before the second absorption)×100%;
[0108] S = m(H2S) / m(CO2).
[0109] It should be noted that the method needs to be measured under the condition of gas supply at 40°C.
[0110] In summary, the testing device 10 for absorption selectivity of SRV furnace gas of the present application has at least the following advantages:
[0111] 1. This application can realize the accurate determination of CS absorption selectivity in SRV furnace gas, and provide a theoretical basis and guidance for subsequent separation operations such as SRV furnace gas fine desulfurization and carbon capture.
[0112] 2. This application is easy and flexible to operate, and the measurement cycle is short.
[0113] Of course, in the above-mentioned specific steps, the operation sequence is only used for illustration and does not necessarily limit the operation sequence. In some other usage scenarios, the operation sequence may be adjusted as needed.
[0114] It should be noted that in the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0115] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.
[0116] Although the preferred embodiments of this specification have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of this specification.
[0117] Obviously, those skilled in the art can make various changes and modifications to this specification without departing from the spirit and scope of this specification. Thus, if these modifications and variations of this specification fall within the scope of the claims of this specification and their equivalents, this specification is also intended to include these modifications and variations.
Claims
1. A test device for the absorption selectivity of SRV furnace gas, characterized in that: include: A first gas cylinder, a second gas cylinder and a gas mixer, wherein H2S is passed through the first gas cylinder, CO2 is passed through the second gas cylinder, and the gas outlet of the first gas cylinder and the gas outlet of the second gas cylinder are selectively connected to the inlet of the gas mixer respectively; an absorption tower, wherein an absorption solution is passed through the absorption tower and is connected to the outlet of the gas mixer; Wherein, a first sampling valve is provided between the absorption tower and the outlet of the gas mixer, and a second sampling valve is provided at the gas outlet of the absorption tower.
2. The testing device for absorption selectivity of SRV furnace gas according to claim 1, characterized in that: Also includes: a first flow regulating valve, the first flow regulating valve being arranged between the gas outlet of the first gas cylinder and the inlet of the gas mixer; A second flow regulating valve is arranged between the gas outlet of the second gas cylinder and the inlet of the gas mixer.
3. The testing device for absorption selectivity of SRV furnace gas according to claim 2, characterized in that: Also includes: a first filter pressure reducer, the first filter pressure reducer being arranged between the gas outlet of the first gas cylinder and the first flow regulating valve; A second filter pressure reducer is provided between the gas outlet of the second gas cylinder and the second flow regulating valve.
4. The device for testing the absorption selectivity of SRV furnace gas according to claim 3, characterized in that: Also includes: A control component, wherein the first flow regulating valve and the second flow regulating valve are arranged in parallel and are both electrically connected to the control component.
5. A testing device for the absorption selectivity of SRV furnace gas according to any one of claims 1 to 4, characterized in that: Also includes: A rich liquid tank and a rich liquid pump, wherein the absorption solution is located in the rich liquid tank, and the rich liquid pump is connected between the rich liquid tank and the liquid inlet of the absorption tower; A lean liquid pool is connected to the liquid outlet of the absorption tower.
6. A method for using a testing device for the absorption selectivity of SRV furnace gas, the method being applicable to the testing device for the absorption selectivity of SRV furnace gas as claimed in any one of claims 1 to 5, characterized in that: The method of use includes: Passing the absorption solutions with different pH values into the absorption tower; Controlling the first gas cylinder and / or the second gas cylinder to be connected to the inlet of the gas mixer; Obtaining a proportional concentration of H2S and / or CO2 before absorption at the first sampling valve, and obtaining a proportional concentration of H2S and / or CO2 after absorption at the second sampling valve; The selectivity of the target absorption solution is calculated according to the relationship between the ratio concentration before absorption and the ratio concentration after absorption.
7. The method for using the device for testing the absorption selectivity of SRV furnace gas according to claim 6, characterized in that: The controlling the first gas cylinder and / or the second gas cylinder to be connected to the inlet of the gas mixer comprises: Controlling the first gas cylinder to be connected to the inlet of the gas mixer, and controlling the second gas cylinder to be closed; or controlling the second gas cylinder to be connected to the inlet of the gas mixer, and controlling the first gas cylinder to be closed; Or the first gas cylinder and the second gas cylinder are controlled to be connected to the inlet of the gas mixer respectively.
8. The method for using the device for testing the absorption selectivity of SRV furnace gas according to claim 7, characterized in that: The method of obtaining the pre-absorption ratio concentration of H2S and / or CO2 at the first sampling valve and obtaining the post-absorption ratio concentration of H2S and / or CO2 at the second sampling valve comprises: Acquire a first pre-absorption proportional concentration of H2S at the first sampling valve, and acquire a first post-absorption proportional concentration of H2S at the second sampling valve; A second pre-absorption proportional concentration of CO 2 is obtained at the first sampling valve, and a second post-absorption proportional concentration of CO 2 is obtained at the second sampling valve.
9. The method for using the device for testing the absorption selectivity of SRV furnace gas according to claim 8, characterized in that: The calculation formula for calculating the selectivity of the target absorption solution is: m(H2S) = (1-proportional concentration after the first absorption / proportional concentration before the first absorption) × 100%; m(CO2)=(1-proportional concentration after the second absorption / proportional concentration before the second absorption)×100%; S=m / m, where m represents the absorption rate of the gas and S represents the selectivity.
10. The method for using the device for testing the absorption selectivity of SRV furnace gas according to claim 6, characterized in that: The controlling the first gas cylinder and / or the second gas cylinder to be connected to the inlet of the gas mixer comprises: The gas pressure of H2S discharged from the first gas cylinder and / or the gas pressure of CO2 discharged from the second gas cylinder are controlled to be the same as the SRV furnace gas pressure.