A device for thermal catalytic conversion of gaseous ion mercury

Abstract

The present invention provides a gaseous ion mercury thermal catalytic conversion device, comprising a back plate, an air inlet channel and an air outlet channel are arranged inside the back plate; at least one reaction chamber, the reaction chamber is arranged on the back plate, the reaction chamber comprises an outer cavity and an inner cavity arranged in the outer cavity, the outer cavity and the inner cavity are separated from each other, a first catalyst is arranged in the outer cavity, and the first catalyst is coated outside the inner cavity, a second catalyst is arranged in the inner cavity, and the inner cavity has a ventilation structure connected to the outer cavity; and a heat conducting block, the heat conducting block is arranged on the back plate and located at the periphery of the reaction chamber. The present invention can facilitate the reuse of the reaction chamber and the separate replacement of different catalysts; and the back plate has the functions of heating and acting as a gas path at the same time, which reduces the switching between pipelines and reduces the risk of cold ends in external pipes.

Description

Technical Field

[0001] The invention belongs to the technical field of gas sampling and analysis, and in particular relates to a gaseous ion mercury thermal catalytic conversion device. Background Art

[0002] Mercury, as the only heavy metal that can be perfectly cycled in the ecosystem, is a highly toxic non-essential element. Mercury and its compounds are listed as carcinogens by the World Health Organization's International Agency for Research on Cancer, and are also listed in the list of toxic and hazardous water pollutants. Under the requirement of continuously improving the status of environmental protection, mercury, as a common substance in industrial flue gas emissions, is gradually required to be tested to meet certain standards before it can be discharged; mercury in flue gas exists mainly in two forms: elemental mercury and divalent mercury. Divalent mercury is easy to lose. In addition, most of the current detection methods are based on optics, using elemental mercury as the detection substance to detect mercury content. Therefore, if you want to get the accurate total mercury content in the flue gas, you need to convert all divalent mercury into elemental mercury. Therefore, it is necessary to design a conversion device structure that converts divalent mercury into elemental mercury online.

[0003] There are two main methods for converting ionic mercury in flue gas in China. One is to use chemical reagents for reduction in the laboratory. The main steps are on-site use, reagent dissolution, and reduction with reducing agents. This method is complicated to operate and has high requirements for operators. In addition, this method cannot be converted in real time and the conversion time is long. The second is a high-temperature cracking method, which is to heat the measuring gas containing ionic mercury to 900°C to crack the combined mercury into elemental mercury. This method is easy to implement, but the high temperature of 900°C increases the risk of use and energy consumption, and has high requirements for the device. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a gaseous ion mercury thermal catalytic conversion device for solving the problem in the prior art that the combined divalent mercury in industrial flue gas mercury cannot be detected.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a gaseous ion mercury thermal catalytic conversion device, comprising:

[0006] A back plate, wherein an air inlet channel and an air outlet channel are arranged inside the back plate;

[0007] At least one reaction chamber, the reaction chamber is arranged on the back plate, the reaction chamber comprises an outer cavity and an inner cavity arranged in the outer cavity, the outer cavity and the inner cavity are separated from each other, the outer cavity is filled with a first catalyst, and the first catalyst is coated outside the inner cavity, the inner cavity is filled with a second catalyst, and the inner cavity has a ventilation structure connected with the outer cavity;

[0008] and a heat-conducting block, wherein the heat-conducting block is arranged on the back plate and located at the periphery of the reaction chamber.

[0009] Furthermore, an isolation net is provided in the outer cavity, two ends of the isolation net are respectively connected to the bottom wall and the top wall of the outer cavity, and the isolation net covers the first catalyst.

[0010] Furthermore, the outer cavity is formed by an outer shell and an outer shell cover, the outer shell and the outer shell cover are detachably connected, and a sealing gasket is arranged between the outer shell and the outer shell cover; the inner cavity is formed by an inner shell and an inner shell cover, the inner shell and the inner shell cover are detachably connected, and a sealing ring and a barrier net are arranged between the inner shell and the inner shell cover.

[0011] Furthermore, the ventilation structure is a first ventilation hole arranged on the inner shell body and a second ventilation hole arranged on the inner shell cover.

[0012] Furthermore, the reaction chamber is pressed against the back plate by a pressing assembly, wherein the pressing assembly includes a pressing plate and positioning columns arranged at both ends of the pressing plate, the pressing plate is connected to the back plate through the positioning columns, and is pressed against the outer shell cover by a first fastener.

[0013] Furthermore, an air inlet and an air outlet are provided at the bottom of the outer shell, a sealing gasket is provided between the outer shell and the back plate, and the sealing gasket is located at the air inlet and the air outlet.

[0014] Furthermore, at least one group of backplane air inlet and backplane exhaust port is provided on the backplane, and one group of the backplane air inlet and backplane exhaust port corresponds to one reaction chamber, the backplane air inlet is aligned with and connected to the air inlet of the corresponding reaction chamber, and the backplane exhaust port is aligned with and connected to the air outlet of the corresponding reaction chamber.

[0015] Furthermore, the back panel is also provided with an inlet joint and at least one outlet joint, one outlet joint corresponds to one back panel exhaust port, the air inlet passage is connected from the inlet joint to all the back panel air inlets, and the air outlet passage is connected from each back panel exhaust port to the corresponding outlet joint separately.

[0016] Furthermore, a plurality of mounting holes for mounting heating rods are arranged inside the back plate.

[0017] Furthermore, the heat conducting block is connected to the back plate via a second fastener, and the heat conducting block is arranged on both sides of the reaction chamber.

[0018] As described above, the gaseous ion mercury thermal catalytic conversion device of the present invention has the following beneficial effects:

[0019] Since the reaction chamber includes an inner cavity and an outer cavity, the inner cavity and the outer cavity are separated from each other, so that the first catalyst and the second catalyst are separated from each other, and different catalysts can be placed according to needs, which is convenient for the separate replacement of the first catalyst and the second catalyst. Furthermore, since the shell cover and the shell of the inner cavity and the outer cavity are both open and disassembled, they can be reused and easily replaced; since the back plate is provided with an air inlet channel, an air outlet channel and a mounting hole, it has the functions of heating, positioning and gas path at the same time, and reduces the transfer between pipelines, and at the same time reduces the risk of cold ends in external pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a gaseous ion mercury thermal catalytic conversion device provided in an embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of the reaction chamber;

[0022] Figure 3 This is the structural diagram of the backplane.

[0023] Part Number Description

[0024] 10-back plate; 101-inlet channel; 102-outlet channel; 11-plug; 12-inlet connector; 13-back plate air inlet; 14-first fixing hole; 15-second fixing hole; 16-third fixing hole; 17-back plate exhaust port; 18-outlet connector; 19-mounting hole; 20-reaction chamber; 211-outer shell; 212-outer shell cover; 213-first catalyst; 214-isolation net; 215-sealing gasket; 216-bolt; 217-sealing gasket; 218-handle; 221-inner shell; 221a-first vent hole; 222-inner shell cover; 222a-second vent hole; 223-second catalyst; 224-sealing ring; 225-barrier net; 30-clamping assembly; 31-positioning column; 32-pressing plate; 33-first fastener; 40-heat conductive block; 41-second fastener. DETAILED DESCRIPTION

[0025] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0026] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0027] Please combine Figure 1 and Figure 2 As shown, the present invention provides a gaseous ion mercury thermal catalytic conversion device, comprising:

[0028] A back plate 10, wherein an air inlet channel 101 and an air outlet channel 102 are provided inside the back plate 10;

[0029] At least one reaction chamber 20, the reaction chamber 20 is arranged on the back plate 10, the reaction chamber 20 includes an outer cavity and an inner cavity arranged in the outer cavity, the outer cavity and the inner cavity are separated from each other, the outer cavity is filled with a first catalyst 213, and the first catalyst 213 is coated outside the inner cavity, the inner cavity is filled with a second catalyst 223, and the inner cavity has a ventilation structure connected to the outer cavity;

[0030] and a heat conducting block 40 , wherein the heat conducting block 40 is disposed on the back plate 10 and is located around the reaction chamber 20 .

[0031] Specifically, the inner cavity is located in the center of the outer cavity and close to the bottom of the outer cavity. Since the inner cavity and the outer cavity are separated from each other, it is convenient to replace the first catalyst 213 and the second catalyst 223 separately in the later stage, and the number of catalyst replacements can also be reduced. After the sample gas enters the outer cavity, it first reacts with the first catalyst 213. Since there is a concentration difference between the second catalyst 223 and the first catalyst 213, the gas in the inner cavity flows out from the ventilation structure and reacts with the sample gas again to complete the conversion of gaseous ionic mercury. Through the present invention, the conversion of combined mercury to elemental mercury can be completed inside the reaction chamber 20, ensuring that the reduced elemental mercury does not leak into the environment.

[0032] Among them, an isolation net 214 is arranged in the outer cavity, and the two ends of the isolation net 214 are respectively connected to the bottom wall and the top wall of the outer cavity, and the isolation net 214 covers the first catalyst 213. Specifically, the isolation net 214 can be connected to the outer shell 211 by welding. On the one hand, the isolation net 214 can prevent the first catalyst 213 from blocking the air inlet and outlet, and on the other hand, it can break up the sample gas entering the reaction chamber 20, so that the sample gas is evenly in contact with the first catalyst 213 for sufficient reaction.

[0033] The outer cavity is formed by an outer shell 211 and an outer shell cover 212, and the outer shell 211 and the outer shell cover 212 are detachably connected, and a sealing gasket 215 is arranged between the outer shell 211 and the outer shell cover 212. Specifically, the outer cavity is a rectangular parallelepiped structure, and the outer shell cover 212 is detachably connected to the outer shell 211 by bolts 216, so that it can be repeatedly used and the first catalyst 213 is easy to replace. In this embodiment, four groups of bolts 216 (and washers) are arranged on the outer shell cover 212, and are evenly distributed at the four corners of the outer shell cover 212. The outer shell 211 and the outer shell cover 212 are sealed by a sealing gasket 215, and the sealing gasket 215 is made of graphite. The sealing gasket 215 is deformed under the pre-tightening force of the bolts 216 (and washers), thereby realizing the sealing effect between the outer shell 211 and the outer shell cover 212 to prevent gas leakage. The outer shell cover 212 is also provided with a handle 218 for easy removal and placement of the outer shell cover 212 when replacing the catalyst.

[0034] The inner cavity is formed by an inner shell 221 and an inner shell cover 222, the inner shell 221 and the inner shell cover 222 are detachably connected, and a sealing ring 224 and a barrier net 225 are arranged between the inner shell 221 and the inner shell cover 222. Specifically, the inner cavity is a cylindrical structure, one end of the inner shell 221 connected to the inner shell cover 222 is provided with an external thread, and the inner shell cover 222 is provided with an internal thread. The inner shell 221 and the inner shell cover 222 are detachably connected through threaded cooperation, so that they can be reused repeatedly and are convenient for replacing the second catalyst 223. In addition, the inner cavity has a ventilation structure connected to the outer cavity, and the ventilation structure is a first ventilation hole 221a arranged on the inner shell 221 and a second ventilation hole 222a arranged on the inner shell cover 222. The gas in the inner cavity can enter the outer cavity through the first ventilation hole 221a and the second ventilation hole 222a, and react with the sample gas. In order to prevent the second catalyst 223 in the inner cavity from mixing into the first catalyst 213, a barrier net 225 is provided at the connection between the first vent hole 221a and the inner cavity and at the connection between the second vent hole 222a and the inner cavity, thereby avoiding mixing of the two catalysts.

[0035] The reaction chamber 20 is pressed against the back plate 10 by a pressing assembly 30, and the pressing assembly 30 includes a pressing plate 32 and positioning columns 31 disposed at both ends of the pressing plate 32. The pressing plate 32 is connected to the back plate 10 by the positioning columns 31, and is pressed against the outer shell cover 212 by a first fastener 33. Specifically, each reaction chamber 20 is positioned by two fixing columns and one pressing plate 32, and the positioning column 31 is threadedly connected to the back plate 10. The pressing plate 32 is pressed against the outer shell cover 212 by a first fastener 33 (such as a bolt) disposed in the center of the pressing plate 32, thereby pressing the reaction chamber 20 against the back plate 10.

[0036] In order to allow the sample gas to enter the reaction chamber 20, an air inlet and an air outlet are provided at the bottom of the outer shell 211, and a sealing gasket 217 is provided between the outer shell 211 and the back plate 10, and the sealing gasket 217 is located at the air inlet and the air outlet. Specifically, the outer shell 211 and the back plate 10 are sealed by the sealing gasket 217 to prevent the leakage of mercury after the sample gas is converted. The sealing gasket 217 can be made of graphite. Under the pressure of the pressure plate 32 and the first fastener 33 (such as a bolt), the sealing gasket 217 is deformed, thereby achieving the sealing between the outer shell 211 and the back plate 10.

[0037] See also Figure 3 In order to allow the sample gas to enter and be discharged from the back plate 10, at least one group of back plate air inlets 13 and back plate exhaust ports 17 are provided on the top surface of the back plate 10, and one group of the back plate air inlets 13 and back plate exhaust ports 17 corresponds to one reaction chamber 20, the back plate air inlet 13 is aligned with and communicated with the corresponding air inlet of the reaction chamber 20, and the back plate exhaust port 17 is aligned with and communicated with the corresponding air outlet of the reaction chamber 20. In this embodiment, two reaction chambers 20 are provided, and thus two groups of back plate 10 air inlets and back plate exhaust ports 17 are provided on the back plate 10 corresponding to the two reaction chambers 20, the sample gas entering from the back plate air inlet 13 enters through the air inlet of the reaction chamber 20, and the sample gas after the reaction is discharged from the air outlet of the reaction chamber 20 through the back plate exhaust port 17.

[0038] In addition, an inlet connector 12 and at least one outlet connector 18 are also provided on the top surface of the back plate 10, and one outlet connector 18 corresponds to one back plate exhaust port 17. The air inlet channel 101 is connected from the inlet connector 12 to all the back plate air inlets 13, and the air outlet channel 102 is connected from each back plate exhaust port 17 to the corresponding outlet connector 18. In this embodiment, since two reaction chambers 20 are provided, two groups of corresponding back plate air inlets 13 and back plate exhaust ports 17 are provided on the back plate 10. Accordingly, one inlet connector 12 and two outlet connectors 18 are provided on the back plate 10. The inlet connector 12 can be connected to an external air inlet pipe to allow the sample gas (ionic mercury) to pass through, and the outlet connector 18 can be connected to an external air outlet pipe to allow the sample gas (elemental mercury) after the reaction to be subsequently collected and analyzed. The air inlet channel 101 is connected from the inlet connector 12 to the two sets of back plate air inlets 13, so that the sample gas enters from one inlet connector 12, and the sample gas flows to the two reaction chambers 20 for catalytic reaction; each reaction chamber 20 corresponds to a separate air outlet channel 102, so that the reacted sample gas flows out from the respective air outlet channels 102. The air path arrangement in the back plate 10 can reduce the transfer between pipelines and reduce the risk of cold ends in external pipe connections.

[0039] Since process holes are generated on the side wall of the back plate 10 when processing the air inlet channel 101 and the air outlet channel 102 , plugs 11 may be provided at corresponding positions, such as the plugs 11 shown in the figure.

[0040] In addition, in order to heat the reaction chamber 20, a plurality of mounting holes 19 for mounting a heating rod are provided inside the back plate 10. Specifically, in the present embodiment, three mounting holes 19 are provided inside the back plate 10 to mount the heating rod, and the heating rod and the mounting holes 19 are clearance-matched. Through the heat transfer effect, the entire device is ultimately heated indirectly. In addition, a heat conducting block 40 is also provided around the reaction chamber 20, and the heat conducting block 40 is connected to the back plate 10 by a second fastener 41 (such as a bolt), and the heat conducting block 40 is provided on both sides of the reaction chamber 20, thereby achieving a uniform heating effect on the reaction chamber 20.

[0041] The back plate 10 is also provided with a plurality of first fixing holes 14 for fixing the heat conducting block 40, a second fixing hole 15 for fixing the positioning column 31, a third fixing hole 16 for fixing the back plate 10, and a fourth fixing hole for fixing the heating rod. The cavity is positioned by the positioning column 31, and in order to make the cavity and the sample gas inlet and outlet on the back plate 10 meet the matching requirements, the processing accuracy of the second fixing hole 15 not only determines whether the sample gas can enter the cavity through the back plate 10, but also determines the sealing effect between the back plate 10 and the cavity.

[0042] When the gaseous ion mercury thermal catalytic conversion device is used, an external air inlet pipe is connected to the inlet joint 12 on the back plate 10, and a sample gas containing ion mercury is introduced. The sample gas flows along the air inlet channel 101 to each back plate air inlet 13, enters the corresponding reaction chamber 20 through the air inlet of the reaction chamber 20, and after the catalytic reaction in the reaction chamber 20, flows from the air outlet of the reaction chamber 20 to the corresponding back plate exhaust port 17, and flows through the air outlet channel 102 to the external air outlet pipe connected to the outlet joint 18 on the back plate 10.

[0043] In summary, in the gaseous ion mercury thermal catalytic conversion device provided by the embodiment of the present invention, since the reaction chamber includes an inner cavity and an outer cavity, the inner cavity and the outer cavity are separated from each other, so that the first catalyst and the second catalyst are separated from each other, and different catalysts can be placed according to needs, which is convenient for the separate replacement of the first catalyst and the second catalyst. Furthermore, since the shell cover and the shell of the inner cavity and the outer cavity are both open and disassembled, they can be reused and replaced easily; since an isolation net is arranged inside the outer cavity, it not only prevents the first catalyst from blocking the air inlet and outlet, but also breaks up the incoming sample gas so that it can evenly contact and react with the catalyst; since the back plate is provided with an air inlet channel, an air outlet channel and a mounting hole, it has the functions of heating, positioning and gas path at the same time, and reduces the switching between pipelines, and reduces the risk of cold ends in external pipes.

[0044] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A gaseous ion mercury thermal catalytic conversion device, characterized in that: include A back plate, wherein an air inlet channel and an air outlet channel are arranged inside the back plate; At least one reaction chamber, the reaction chamber is arranged on the back plate, the reaction chamber comprises an outer cavity and an inner cavity arranged in the outer cavity, the inner cavity is located in the center of the outer cavity and close to the bottom of the outer cavity, the outer cavity and the inner cavity are separated from each other, the outer cavity is filled with a first catalyst, and the first catalyst is coated outside the inner cavity, the inner cavity is filled with a second catalyst, and the inner cavity has a ventilation structure connected to the outer cavity; the outer cavity is formed by an outer shell and an outer shell cover, the outer shell and the outer shell cover are detachably connected, and a sealing gasket is arranged between the outer shell and the outer shell cover; the inner cavity is formed by an inner shell and an inner shell cover, the inner shell and the inner shell cover are detachably connected, and a sealing ring and a barrier net are arranged between the inner shell and the inner shell cover; and a heat-conducting block, wherein the heat-conducting block is arranged on the back plate and located at the periphery of the reaction chamber.

2. A gaseous ion mercury thermal catalytic conversion device according to claim 1, characterized in that: An isolation net is arranged in the outer cavity, two ends of the isolation net are respectively connected to the bottom wall and the top wall of the outer cavity, and the isolation net covers the first catalyst.

3. A gaseous ion mercury thermal catalytic conversion device according to claim 1, characterized in that: The ventilation structure is a first ventilation hole arranged on the inner shell and a second ventilation hole arranged on the inner shell cover.

4. The gaseous ion mercury thermal catalytic conversion device according to claim 1, characterized in that: The reaction chamber is pressed against the back plate by a pressing assembly, wherein the pressing assembly comprises a pressing plate and positioning posts arranged at both ends of the pressing plate, the pressing plate is connected to the back plate by the positioning posts, and is pressed against the outer shell cover by a first fastener.

5. The gaseous ion mercury thermal catalytic conversion device according to claim 1, characterized in that: An air inlet and an air outlet are arranged at the bottom of the outer shell, a sealing gasket is arranged between the outer shell and the back plate, and the sealing gasket is located at the air inlet and the air outlet.

6. A gaseous ion mercury thermal catalytic conversion device according to claim 5, characterized in that: At least one group of backplane air inlet and backplane exhaust ports are arranged on the backplane, and one group of the backplane air inlet and backplane exhaust ports corresponds to one reaction chamber, the backplane air inlet is aligned with and connected to the air inlet of the corresponding reaction chamber, and the backplane exhaust port is aligned with and connected to the air outlet of the corresponding reaction chamber.

7. A gaseous ion mercury thermal catalytic conversion device according to claim 6, characterized in that: The back panel is also provided with an inlet joint and at least one outlet joint, one outlet joint corresponds to one back panel exhaust port, the air inlet passage is connected from the inlet joint to all the back panel air inlets, and the air outlet passage is connected from each back panel exhaust port to the corresponding outlet joint separately.

8. The gaseous ion mercury thermal catalytic conversion device according to claim 1, characterized in that: A plurality of mounting holes for mounting heating rods are arranged inside the back plate.

9. The gaseous ion mercury thermal catalytic conversion device according to claim 1, characterized in that: The heat conducting block is connected to the back plate through a second fastener, and the heat conducting block is arranged on both sides of the reaction chamber.

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