Sampling device for wet flue gas in chemical looping process

Abstract

The utility model discloses a sampling device for wet flue gas in a chemical looping process. The sampling device comprises a flue gas sampling pipeline and two gas-solid separators, the flue gas sampling pipeline comprises a sampling pipe section, two branch pipe sections and a main conveying pipe section, the sampling pipe section extends into the reactor to collect flue gas, the two branch pipe sections are connected to the rear end of the sampling pipe section, the two gas-solid separators are arranged on the two branch pipe sections respectively, and the main conveying pipe section is connected with the two gas-solid separators. The main conveying pipe section is connected with the end parts, far away from the sampling pipe section, of the two branch pipe sections and is used for outputting gas separated by the gas-solid separator; the sampling device further comprises control valves used for controlling the two branch pipe sections to be connected and disconnected respectively. According to the scheme provided by the utility model, the flue gas sampling continuity of the sampling device can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of chemical technology, and more specifically, to a sampling device for wet flue gas in a chemical chain process. Background Technology

[0002] Chemical looping is a process in which oxygen carriers are combusted or gasified with fossil fuels, biomass fuels, etc., within a reactor, enabling efficient conversion of clean energy and carbon dioxide capture. However, during the operation of a chemical looping system, the flue gas inside the fuel reactor contains a large amount of complex components such as water vapor, dust, and oxygen carrier powder.

[0003] In existing technologies, to obtain gas samples from inside a reactor for testing, wet flue gas is typically collected from inside the reactor, dust is removed from the collected flue gas, and then it is transported to a testing instrument for analysis, thereby obtaining information about the reaction conditions inside the reactor. The current problem is that flue gas collection can be interrupted due to issues such as cleaning up the removed dust. Utility Model Content

[0004] This invention provides a sampling device for wet flue gas during chemical chain processes, in order to solve the problem of interruption in flue gas collection during chemical chain processes.

[0005] An embodiment of this utility model provides a flue gas sampling device, including: a flue gas sampling pipeline and two gas-solid separators;

[0006] The flue gas sampling pipeline includes a sampling pipe section, two branch pipe sections, and a main delivery pipe section. The sampling pipe section is configured to extend into the reactor to collect flue gas. The two branch pipe sections are configured to be connected to the rear end of the sampling pipe section. The two gas-solid separators are respectively installed on the two branch pipe sections. The main delivery pipe section is connected to the ends of the two branch pipe sections that are away from the sampling pipe section, so as to output the gas separated by the gas-solid separators.

[0007] The sampling device also includes control valves for controlling the on / off state of the two branch pipe sections respectively.

[0008] In one embodiment, the control valve includes a first control valve, a second control valve, and a third control valve. The first control valve is installed upstream of a gas-solid separator on one of the branch pipe sections, and the second control valve is installed downstream of a gas-solid separator on the other branch pipe section. A main control valve for controlling the two branch pipe sections is installed on the upstream pipelines of the two branch pipe sections.

[0009] In one embodiment, the sampling device further includes a temperature control component disposed on the sampling tube section, the two branch tube sections and the gas-solid separator, wherein the temperature control component is a heat preservation component or a heating component.

[0010] In one embodiment, the gas-solid separator includes a cyclone separator connected to the branch pipe section and a dust collection tank located below the cyclone separator. The dust collection tank is configured to collect the dust separated by the cyclone separator and has a bottom opening and a switch valve for controlling the bottom opening.

[0011] In one embodiment, the main delivery pipe section includes a cooling pipe section located downstream of the two branch pipe sections, and a water-gas separator is connected to the cooling pipe section so that the flue gas can be condensed after entering the cooling pipe section, and the condensate flows into the water-gas separator.

[0012] In one embodiment, the sampling device further includes a drying filter located on the main delivery pipe section and downstream of the cooling pipe section.

[0013] In one embodiment, the drying filter is provided in one or multiple arrangements in series.

[0014] In one embodiment, the sampling device further includes a vacuum pump disposed on the main delivery pipe section to create a negative pressure in the flue gas sampling pipeline.

[0015] In one embodiment, the sampling device further includes an exhaust valve located on the main delivery pipe section and downstream of the vacuum pump to discharge gas from the main delivery pipe section through the exhaust valve.

[0016] In one embodiment, the sampling device further includes a pressure regulating valve located on the main delivery pipe section and downstream of the exhaust valve, for regulating the gas pressure output from the main delivery pipe section.

[0017] The solution provided in this embodiment of the invention involves setting up two branch pipe sections, each equipped with a gas-solid separator, and control valves to control the on / off state of the branch pipe sections. By controlling the on / off state of the two branch pipe sections, one branch pipe section can be connected to both the sampling pipe section and the main delivery pipe section, thereby achieving gas-solid separation of the mixed flue gas containing gas and solid particles after passing through the gas-solid separator on that branch pipe section. Thus, if one branch pipe section needs to be shut down due to the need to clean the dust separated by the gas-solid separator, or due to a malfunction of one branch pipe section or its gas-solid separator, the other branch pipe section can be opened, allowing the gas-solid separator on that branch pipe section to continue operating. This ensures the continuity of flue gas sampling without interruption. Furthermore, when a detection and analysis instrument is connected to the end of the main delivery pipe section, the instrument can continuously monitor the flue gas, thereby better obtaining the reaction status of a continuous process within the reactor.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solution of this utility model and do not constitute a limitation on the technical solution of this utility model.

[0020] Figure 1 This is a schematic diagram of a sampling device for wet flue gas in a chemical chaining process according to one embodiment of this application;

[0021] Figure 2 for Figure 1 A partially enlarged schematic diagram of the sampling device.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1-Flue gas sampling pipeline; 11-Sampling pipe section; 12-Branch pipe section; 13-Main delivery pipe section; 131-Cooling pipe section; 14-Sealing flange; 2-Gas-solid separator; 21-Cyclone separator; 22-Dust collection tank; 23-Switch valve; 31-Main control valve; 32-First control valve; 33-Second control valve; 34-Third control valve; 4-Water-gas separator; 51-First switch valve; 52-Second switch valve; 6-Drying filter; 7-Vacuum pump; 8-Exhaust valve; 9-Pressure regulating valve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

[0025] Embodiments of this application provide a sampling device for wet flue gas in a chemical chaining process, such as... Figure 1 and Figure 2 As shown, it includes: flue gas sampling pipeline 1 and two gas-solid separators 2;

[0026] The flue gas sampling pipeline 1 includes a sampling pipe section 11, two branch pipe sections 12, and a main delivery pipe section 13. The sampling pipe section 11 is configured to extend into the reactor to collect flue gas. A sealing flange 14 can be installed on the sampling pipe section 11 to seal the opening when the sampling pipe section 11 extends into the reactor. The two branch pipe sections 12 are configured to be connected to the rear end of the sampling pipe section 11. Two gas-solid separators 2 are respectively installed on the two branch pipe sections 12. The main delivery pipe section 13 is connected to the ends of the two branch pipe sections 12 that are away from the sampling pipe section 11 to output the gas separated by the gas-solid separators 2.

[0027] The sampling device also includes control valves for controlling the on / off state of the two branch pipe sections 12 respectively.

[0028] The embodiment of this application provides a solution by setting up two branch pipe sections 12, each with a gas-solid separator 2, and a control valve to control the on / off state of the branch pipe sections 12. By controlling the on / off state of the two branch pipe sections 12, one branch pipe section 12 can be connected to the sampling pipe section 11 and the main delivery pipe section 13. The flue gas passing through the gas-solid separator 2 on this branch pipe section 12 undergoes gas-solid separation, while the other branch pipe section 12 serves as a backup. In this way, if it is necessary to clean the dust separated by the gas-solid separator 2 (in a reactor using an oxygen carrier for oxidation-reduction, this dust mainly consists of oxygen carrier powder and dust, etc.), or if one branch pipe section 12 or its gas-solid separator 2 malfunctions and needs to be shut down, the other branch pipe section 12 can be opened, allowing the gas-solid separator 2 on the other branch pipe section 12 to continue operating. This ensures the continuity of flue gas sampling by the sampling device without interruption. Furthermore, when a detection and analysis instrument is connected to the end of the main delivery pipe section 13, the detection and analysis instrument can achieve continuous detection of flue gas, thereby better obtaining the reaction status of a continuous process within the reactor.

[0029] In one embodiment, such as Figure 1 and Figure 2As shown, the gas-solid separator 2 includes a cyclone separator 21 connected to the branch pipe 12 and a dust collection tank 22 located below the cyclone separator 21. The dust collection tank 22 is configured to collect the dust separated by the cyclone separator 21, and has a bottom opening and a switch valve 23 for controlling the bottom opening. Of course, the gas-solid separator 2 can also have other structural forms, as long as it can separate gas and solid.

[0030] In one embodiment, to control the on / off state of the two branch pipe sections 12, such as Figure 1 and Figure 2 As shown, the control valves on the two branch pipe sections 12 include a first control valve 32, a second control valve 33, and a third control valve 34. The first control valve 32 is located upstream of the gas-solid separator 2 on one branch pipe section 12, and the second control valve 33 is located downstream. The third control valve 34 is located downstream of the gas-solid separator 2 on the other branch pipe section 12. A main control valve 31 controlling both branch pipe sections 12 is installed on the upstream pipeline. The main control valve 31, the first control valve 32, the second control valve 33, and the third control valve 34 can be manual ball valves or other types of on / off valves.

[0031] When no flue gas sampling is being performed, the main control valve 31 is closed. When sampling is being performed, the main control valve 31 is opened, and the control valve on one of the branch pipe sections 12 is also opened. The flue gas obtained by the sampling pipe section 11 can enter the gas-solid separator 2 along one of the branch pipe sections 12. The gas separated by the gas-solid separator 2 enters the main delivery pipe section 13. The separated dust and impurities and other solids enter the dust collection tank 22. When the dust in the dust collection tank 22 needs to be collected or cleaned, the branch pipe section 12 is closed and the other branch pipe section 12 is opened. The flue gas obtained by the sampling pipe section 11 enters the gas-solid separator 2 along the other branch pipe section 12 to continue gas-solid separation. Thus, the gas delivery of the main delivery pipe section 13 will not be interrupted.

[0032] In some embodiments, the flue gas inside the fuel reactor contains a large amount of complex components such as water vapor, dust and oxygen carrier powder. When gas sampling is carried out, the water vapor in the multi-component flue gas sampled by the sampling pipe section 11 will condense due to the temperature drop of the pipe section. As a result, the flue gas sampling pipe 1 may be blocked, causing problems such as being unable to collect gas normally.

[0033] To address this issue, the sampling device may further include a temperature control component (not shown in the figure) disposed on the sampling tube section 11, the two branch tube sections 12, and the gas-solid separator 2. The temperature control component may be an insulation component or a heating component. The heating component may be equipped with a heating element such as a heating wire, and may be able to cover the sampling tube section 11, the branch tube sections 12, and the gas-solid separator 2 to heat them. The insulation component may be a heat-insulating material covered on the sampling tube section 11, the branch tube sections 12, and the gas-solid separator 2. Figure 1 and Figure 2 The structure within the dashed line is equipped with heat-insulating or heating components. By installing these components, the temperature of the flue gas inside the sampling pipe section 11, the two branch pipe sections 12, and the gas-solid separator 2 is kept within a predetermined range. As a result, the flue gas obtained from the reactor does not decrease in temperature as it enters the branch pipe section 12 and the gas-solid separator 2. Consequently, water vapor and dust in the flue gas do not condense, thus solving the problem of water vapor and dust condensation caused by temperature drop in the flue gas collected by the sampling device before gas-solid separation.

[0034] In one embodiment, the main conveying pipe section 13 includes a cooling pipe section 131 located downstream of two branch pipe sections 12. A water-gas separator 4 is connected to the cooling pipe section 131 so that the flue gas can be condensed after entering the cooling pipe section 131, and the condensate flows into the water-gas separator 4. The cooling pipe section 131 may be a pipe section that is immersed in cooling water for cooling, or a pipe section that is cooled by other cooling methods.

[0035] Since the dust is separated after the sampled flue gas passes through the gas-solid separator 2, the separated gas then enters the cooling pipe section 131 for condensation (at this time, the condensation will not cause water vapor and dust to condense). Most of the water vapor in the flue gas forms condensate through condensation, and the condensate enters the water-gas separator 4 under the action of gravity and negative pressure.

[0036] The water-gas separator 4 has a bottom opening and a first switch valve 51 for controlling the bottom opening. A second switch valve 52 can also be installed on the pipe section connected above the water-gas separator 4. When a large amount of condensate is collected in the water-gas separator 4, the second switch valve 52 can be closed and the first switch valve 51 can be opened, and the condensate in the water-gas separator 4 can be released from the bottom opening.

[0037] In one embodiment, the sampling device may further include a dryer filter 6 located on the main delivery pipe section 13 and downstream of the cooling pipe section 131. The flue gas, after being dehydrated by the cooling pipe section 131 and the water-gas separator 4, enters the dryer filter 6, where moisture is further removed and impurities such as ash are filtered out. The flue gas, after being further processed by the dryer filter 6, can then be fed into a detection and analysis instrument for analysis and research.

[0038] Optionally, one or multiple dryer filters 6 can be installed. Figure 1 and Figure 2 The diagram shows that two dryer filters 6 are connected in series on the main delivery pipe section 13. Passing through multiple dryer filters 6 allows for more thorough drying and filtration of the flue gas.

[0039] In one embodiment, in order to allow the flue gas in the reactor to enter the sampling device, the sampling device further includes a vacuum pump 7 disposed on the main delivery pipe section 13 to create a negative pressure in the main delivery pipe section 13.

[0040] exist Figure 1 In this embodiment, the vacuum pump 7 is positioned downstream of the dryer filter 6, allowing the gas to pass through the dryer filter 6 quickly under negative pressure. Since the gas dried and filtered by the dryer filter 6 is clean with minimal dust and water vapor, positioning the vacuum pump 7 downstream of the dryer filter 6 prevents damage from incoming gas. Alternatively, the vacuum pump 7 could be positioned upstream of the dryer filter 6 in the main delivery pipe section 13, but the presence of dust and water vapor in the flue gas upstream of the dryer filter 6 would affect the vacuum pump 7.

[0041] To facilitate control of the gas flow rate output at the end of the main delivery pipe section 13, the vacuum pump 7 can be set as a variable frequency vacuum pump. By adjusting the frequency of the vacuum pump 7, the flow rate of the gas pumped by the vacuum pump 7 can be changed.

[0042] In addition, the sampling device may also include an exhaust valve 8 located on the main delivery pipe section 13 and downstream of the vacuum pump 7. When the gas flow at the outlet of the vacuum pump 7 is too large, the operator can adjust the exhaust valve 8 to discharge part of the gas in the main delivery pipe section 13 in order to control the gas flow.

[0043] The sampling device may also include a pressure regulating valve 9 located on the main delivery pipe section 13 and downstream of the exhaust valve 8, for regulating the gas pressure output from the main delivery pipe section 13, so that the gas is at a suitable pressure for detection and analysis instruments or for collection.

[0044] In practical applications, the end of the main delivery pipe section 13 of the sampling device is usually connected to a detection and analysis instrument. The main delivery pipe section 13 continuously delivers the gas sampled and processed over a period of time to the detection and analysis instrument, which can then analyze and obtain the status of a reaction process within the reactor.

[0045] In the description of this utility model, it should be noted that the terms "upper", "lower", "one side", "the other side", "one end", "the other end", "side", "opposite", "four corners", "periphery", "'mouth' structure", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the structure referred to has a specific orientation, or is constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] In the description of the embodiments of this utility model, unless otherwise expressly specified and limited, the terms "connection," "direct connection," "indirect connection," "fixed connection," "installation," and "assembly" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. The terms "installation," "connection," and "fixed connection" can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal communication between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0047] Although the embodiments disclosed in this utility model are as described above, the content described is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any person skilled in the art to which this utility model pertains may make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed in this utility model, but the patent protection scope of this utility model shall still be defined by the appended claims.

Claims

1. A sampling device for wet flue gas in a chemical chaining process, characterized in that, include: Flue gas sampling pipeline and two gas-solid separators; The flue gas sampling pipeline includes a sampling pipe section, two branch pipe sections, and a main delivery pipe section. The sampling pipe section is configured to extend into the reactor to collect flue gas. The two branch pipe sections are configured to be connected to the rear end of the sampling pipe section. The two gas-solid separators are respectively installed on the two branch pipe sections. The main delivery pipe section is connected to the ends of the two branch pipe sections that are away from the sampling pipe section, so as to output the gas separated by the gas-solid separators. The sampling device also includes control valves for controlling the on / off state of the two branch pipe sections respectively.

2. The sampling device according to claim 1, characterized in that, The control valve includes a first control valve, a second control valve, and a third control valve. The first control valve is installed upstream of the gas-solid separator on one of the branch pipe sections, and the second control valve is installed downstream. The third control valve is installed downstream of the gas-solid separator on the other branch pipe section. A main control valve for controlling the two branch pipe sections is installed on the upstream pipeline of the two branch pipe sections.

3. The sampling device according to claim 1, characterized in that, It also includes temperature control components installed on the sampling tube section, the two branch tube sections and the gas-solid separator, wherein the temperature control components are insulation components or heating components.

4. The sampling device according to claim 1, characterized in that, The gas-solid separator includes a cyclone separator connected to the branch pipe section and a dust collection tank located below the cyclone separator. The dust collection tank is configured to collect the dust separated by the cyclone separator and has a bottom opening and a switch valve for controlling the bottom opening.

5. The sampling device according to claim 2, characterized in that, The main delivery pipe section includes a cooling pipe section located downstream of the two branch pipe sections, and a water-gas separator is connected to the cooling pipe section so that the flue gas can be condensed after entering the cooling pipe section, and the condensate flows into the water-gas separator.

6. The sampling device according to claim 5, characterized in that, It also includes a drying filter located on the main delivery pipe section and downstream of the cooling pipe section.

7. The sampling device according to claim 6, characterized in that, The dryer filter is provided in one or multiple arrangements in series.

8. The sampling device according to any one of claims 1-7, characterized in that, It also includes a vacuum pump installed on the main delivery pipe section to create a negative pressure in the flue gas sampling pipeline.

9. The sampling device according to claim 8, characterized in that, It also includes an exhaust valve located on the main delivery pipe section and downstream of the vacuum pump, through which gas in the main delivery pipe section is discharged.

10. The sampling device according to claim 9, characterized in that, It also includes a pressure regulating valve located on the main delivery pipe section and downstream of the exhaust valve, for regulating the gas pressure output from the main delivery pipe section.

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