A gaseous ion mercury thermal catalytic conversion chamber

Abstract

The present invention provides a gaseous ion mercury thermal catalytic conversion cavity, comprising a shell, a shell cover and a heating component coated on the outside of the shell, the shell and the shell cover are detachably connected to form a cavity for accommodating a catalyst, the cavity is a cylindrical structure, the shell is provided with an inlet pipe and an outlet pipe extending into the cavity, the side wall of the inlet pipe is provided with a plurality of vent groups for gas homogenization, and the end of the outlet pipe is provided with an oblique gas guide for gas guidance. The present invention can improve the uniformity of mercury concentration inside the cavity and accelerate the time for equilibrium of inlet and outlet mercury concentrations.

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 chamber. Background Art

[0002] Mercury, commonly known as quicksilver, can evaporate at room temperature. Mercury vapor and mercury compounds are highly toxic (chronic). It is the only non-essential heavy metal element that can be completely circulated in the ecosystem. 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. Currently, the measurement methods and instruments for total mercury are mostly based on elemental mercury, while mercury in industrial flue gas exists in the form of elemental mercury and ionic mercury. Existing detection instruments and methods are usually based on elemental heavy metals. In order to adapt to existing detection instruments and methods, ionic mercury needs to be converted into elemental mercury. Therefore, it is necessary to develop a structural device that can convert ionic mercury into elemental mercury online.

[0003] There are two main methods for converting ionic mercury to elemental mercury in China. One is to use chemical reagents to reduce and convert it in a laboratory container. The main steps are on-site sampling, reagent dissolution, and reduction with reducing agents. This method is complicated to operate, has high requirements for operators, and takes a long time to convert. The other is a high-temperature cracking method. This method heats the measuring gas containing ionic mercury to 900°C in a high-temperature resistant device to crack the ionic mercury into elemental mercury. This method is easy to implement, but the high temperature of 900°C has high requirements for the device, increases energy consumption, and poses certain risks to operators. 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 chamber for solving the problem in the prior art that ion mercury in industrial flue gas mercury cannot be detected.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a gaseous ion mercury thermal catalytic conversion chamber, comprising a shell, a shell cover and a heating component coated on the outside of the shell, the shell and the shell cover are detachably connected to form a cavity for accommodating a catalyst, the cavity is a cylindrical structure, the shell is provided with an inlet pipe and an outlet pipe extending into the cavity, the side wall of the inlet pipe is provided with a vent hole group for gas homogenization, and the end of the outlet pipe is provided with an air guide oblique port for gas guidance.

[0006] Furthermore, the end of the air inlet pipe extends into the bottom of the cavity, and the end of the air outlet pipe extends into the middle of the cavity.

[0007] Furthermore, the ventilation hole group is provided with at least one row on both sides and the bottom side of the air intake pipe in the radial direction, and each row of the ventilation hole group includes a plurality of ventilation holes arranged along the axial direction of the air intake pipe.

[0008] Furthermore, the oblique air guide opening is arranged to be inclined with respect to the axial direction of the air outlet pipe, and the opening of the oblique air guide opening faces the center of the cavity.

[0009] Furthermore, an isolation net is provided between the air inlet pipe and the air outlet pipe, two ends of the isolation net are respectively connected to the bottom wall and the top wall of the cavity, and a catalyst is provided in the isolation net.

[0010] Furthermore, the heating assembly includes two heating blocks and a heating rod disposed in the heating blocks. The two heating blocks are relatively connected, and each heating block has a mounting hole for accommodating the heating rod.

[0011] Furthermore, shell ears are provided on the outer walls on both sides of the shell, and the shell ears are located between the two heating blocks.

[0012] Furthermore, the shell and the shell cover are connected by fasteners, and a sealing gasket is provided between the shell and the shell cover, and the sealing gasket is located at the top ends of the air inlet pipe and the air outlet pipe.

[0013] Furthermore, the shell cover is provided with two air pipe joints, and the two air pipe joints are aligned and communicated with the air inlet pipe and the air outlet pipe respectively.

[0014] Furthermore, a handle is provided on the shell cover, and the handle is located in the center of the shell cover.

[0015] As described above, the gaseous ion mercury thermal catalytic conversion chamber of the present invention has the following beneficial effects:

[0016] The use of a cylindrical cavity structure, an air vent group of the air inlet pipe, and an air guide oblique port of the air outlet pipe improves the uniformity of mercury concentration inside the cavity and accelerates the time for balancing the inlet and outlet mercury concentrations. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a gaseous ion mercury thermal catalytic conversion chamber provided in an embodiment of the present invention;

[0018] Figure 2 for Figure 1 AA section view.

[0019] Part Number Description

[0020] 1-shell; 2-shell cover; 3-heating block; 31-mounting hole; 4-inlet pipe; 41-vent group; 5-outlet pipe; 51-gas guide bevel; 6-isolation net; 7-catalyst; 8-shell ear; 9-fastener; 10-sealing gasket; 11-trachea joint; 12-handle. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] Please combine Figure 1 and Figure 2 As shown, the present invention provides a gaseous ion mercury thermal catalytic conversion chamber, including a shell 1, a shell cover 2 and a heating component coated on the outside of the shell 1, the shell 1 and the shell cover 2 are detachably connected to form a cavity for accommodating a catalyst 7, the cavity is a cylindrical structure, the shell 1 is provided with an inlet pipe 4 and an outlet pipe 5 extending into the cavity, the side wall of the inlet pipe 4 is provided with a vent hole group 41 for gas homogenization, and the end of the outlet pipe 5 is provided with a gas guide oblique port 51 for gas guidance.

[0024] Through the present invention, the conversion of ionized mercury to elemental mercury can be completed inside the cavity, ensuring that the reduced elemental mercury does not leak into the environment. In addition, by adopting a cylindrical cavity, the vent group 41 of the air inlet pipe 4 and the air guide oblique port 51 of the air outlet pipe 5, on the one hand, the uniformity of the mercury concentration inside the cavity is improved, and on the other hand, the time for the equilibrium of the inlet and outlet mercury concentration is accelerated.

[0025] Specifically, the air inlet pipe 4 and the air outlet pipe 5 are both arranged on the top wall of the shell 1 and can be connected to the shell 1 by welding. The air inlet pipe 4 and the air outlet pipe 5 are respectively located on both sides of the cavity, the end of the air inlet pipe 4 extends to the bottom of the cavity, and the end of the air outlet pipe 5 extends to the middle of the cavity. In addition, a plurality of vent groups 41 for gas homogenization are arranged on the side wall of the air inlet pipe 4, and the vent groups 41 are arranged at least one row along the left and right sides and the bottom side of the radial direction of the air inlet pipe 4, and each row of vent groups 41 includes a plurality of vents arranged along the axial direction of the air inlet pipe 4. In this embodiment, a row of vent groups 41 is arranged on the bottom side, the left side and the right side of the air inlet pipe 4, and each row of vent groups 41 includes five vents. By extending the end of the air inlet pipe 4 to the bottom of the cavity and the vent group 41 arranged on the air inlet pipe 4, the ionic mercury in the sample gas can be uniformly introduced into the cavity.

[0026] In addition, the end of the gas outlet pipe 5 is provided with a gas guide oblique opening 51 for gas guidance, and the gas guide oblique opening 51 is arranged obliquely with respect to the axial direction of the gas outlet pipe 5, and the opening of the gas guide oblique opening 51 faces the center of the cavity. By extending the end of the gas outlet pipe 5 into the middle of the cavity, and the gas outlet pipe 5 adopts the structure of the gas guide oblique opening 51, the converted sample gas (elemental mercury) can all flow out of the gas outlet pipe 5, reducing the dead zone area at the farthest distance from the end of the gas outlet pipe 5.

[0027] An isolation net 6 is provided between the air inlet pipe 4 and the air outlet pipe 5, and the two ends of the isolation net 6 are respectively connected to the bottom wall and the top wall of the cavity, and a catalyst 7 is provided in the isolation net 6. Specifically, the isolation net 6 can be connected to the housing 1 by welding. By providing the isolation net 6, on the one hand, it can prevent the catalyst 7 from blocking the inlet and outlet of the sample gas, and on the other hand, it can also be used to break up the sample gas so that the sample gas enters the catalyst 7 more evenly, so that the reaction between the sample gas and the catalyst 7 is more sufficient, and the mercury ions in the sample gas can be converted into elemental mercury through the catalyst 7.

[0028] The shell 1 is coated with a heating assembly to heat the sample gas inside the shell 1 to promote the catalytic reduction reaction. The heating assembly includes two heating blocks 3 and a heating rod arranged in the heating blocks 3. The two heating blocks 3 are relatively connected, and each of the heating blocks 3 has a mounting hole 31 for accommodating the heating rod. Specifically, the two heating blocks 3 have the same structure and are made of aluminum for fast heat conduction. The two heating blocks 3 are relatively arranged and connected by a tower buckle, which plays a role in positioning and fixing the internal shell 1 to prevent the shell 1 from moving. The two heating blocks 3 cover the shell 1, and each heating block 3 is provided with two mounting holes 31 for installing the heating rod to heat the cavity. In this embodiment, the two mounting holes 31 are symmetrically arranged to ensure uniform heating effect.

[0029] In addition, shell ears 8 are provided on the outer walls of both sides of the shell 1, and the shell ears 8 are located between the two heating blocks 3. Specifically, the shell ears 8 can be connected to the shell 1 by welding, and the shell ears 8 are used to position and fix the shell 1.

[0030] In order to facilitate the replacement of the catalyst 7, the shell 1 and the shell cover 2 are detachably connected by fasteners 9. In this embodiment, the fasteners 9 are bolts and gaskets, and four groups of bolts and gaskets are used to connect the shell 1 and the shell cover 2. In addition, a sealing gasket 10 is provided between the shell 1 and the shell cover 2, and the sealing gasket 10 is located at the top of the inlet pipe 4 and the outlet pipe 5. In this embodiment, the sealing gasket is made of graphite. The sealing gasket 10 is used for sealing between the shell 1 and the shell cover 2 to prevent leakage of sample gas. It is deformed under the pre-tightening force of the bolts and gaskets, thereby achieving sealing between the shell 1 and the shell cover 2.

[0031] In order to facilitate the external air pipe, two air pipe joints 11 are provided on the shell cover 2, and the two air pipe joints 11 are respectively aligned and communicated with the air inlet pipe 4 and the air outlet pipe 5. Specifically, the air pipe joints 11 can be connected to the shell cover 2 by welding, and the air pipe joints 11 are used to cooperate with the shell 1 to form the sample gas inlet and sample gas outlet of the cavity, and the external air pipe can be directly connected to the corresponding air pipe joints 11.

[0032] In addition, the shell cover 2 is also provided with a handle 12, and the handle 12 is located in the center of the shell cover 2. The handle 12 can be connected to the shell cover 2 by welding, and the handle 12 is used to facilitate the removal of the shell cover 2 when replacing the catalyst 7.

[0033] When the thermal catalytic reduction of gaseous ionic mercury is carried out, the external air inlet pipe and the external air outlet pipe are respectively connected to the two air pipe joints 11 on the shell cover 2, and the sample gas enters the cavity from the external air inlet pipe through the air inlet pipe 4. Due to the air vent group 41 on the air inlet pipe 4, the sample gas can enter the cavity below the isolation net 6 more evenly. Combined with the effect of the isolation net 6 to break up the sample gas, the sample gas of ionic mercury can enter the catalyst 7 more evenly, making the reaction more complete. The sample gas (elemental mercury) after the reaction flows out from the air outlet pipe 5 and flows to the external air outlet pipe for collection.

[0034] In summary, in a gaseous ion mercury thermal catalytic conversion chamber provided in an embodiment of the present invention, due to the use of a cylindrical chamber structure and the coordinated use of the vent hole group of the inlet pipe and the air guide bevel of the outlet pipe, on the one hand, the uniformity of the mercury concentration inside the chamber is improved, and on the other hand, the time for balancing the inlet and outlet mercury concentrations is accelerated.

[0035] 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 chamber, characterized in that: It includes a shell, a shell cover and a heating component covered on the outside of the shell, the shell and the shell cover are detachably connected to form a cavity for accommodating a catalyst, the cavity is a cylindrical structure, the shell is provided with an inlet pipe and an outlet pipe extending into the cavity, the end of the inlet pipe extends to the bottom of the cavity, and the end of the outlet pipe extends to the middle of the cavity; a vent group for gas homogenization is provided on the side wall of the inlet pipe, the vent group is provided with at least one row on the left and right sides and the bottom side of the radial direction of the inlet pipe, and each row of the vent group includes a plurality of vents arranged along the axial direction of the inlet pipe; an air guide oblique port for gas guidance is provided at the end of the outlet pipe, the air guide oblique port is inclined to the axial direction of the outlet pipe, and the opening of the air guide oblique port faces the center of the cavity.

2. A gaseous ion mercury thermal catalytic conversion chamber according to claim 1, characterized in that: An isolation net is arranged between the air inlet pipe and the air outlet pipe, two ends of the isolation net are respectively connected to the bottom wall and the top wall of the cavity, and a catalyst is arranged in the isolation net.

3. The gaseous ion mercury thermal catalytic conversion chamber according to claim 1, characterized in that: The heating assembly comprises two heating blocks and a heating rod arranged in the heating blocks. The two heating blocks are connected relative to each other, and each heating block has a mounting hole for accommodating the heating rod.

4. A gaseous ion mercury thermal catalytic conversion chamber according to claim 3, characterized in that: Shell ears are arranged on the outer walls of both sides of the shell, and the shell ears are located between the two heating blocks.

5. The gaseous ion mercury thermal catalytic conversion chamber according to claim 1, characterized in that: The shell body and the shell cover are connected by fasteners, and a sealing gasket is arranged between the shell body and the shell cover, and the sealing gasket is located at the top ends of the air inlet pipe and the air outlet pipe.

6. The gaseous ion mercury thermal catalytic conversion chamber according to claim 1, characterized in that: The shell cover is provided with two air pipe joints, and the two air pipe joints are aligned and communicated with the air inlet pipe and the air outlet pipe respectively.

7. The gaseous ion mercury thermal catalytic conversion chamber according to claim 1, characterized in that: The shell cover is also provided with a handle, and the handle is located in the center of the shell cover.

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