CN214472526U

CN214472526U - Detection system suitable for low-concentration nitrogen oxide adsorption material

Info

Publication number: CN214472526U
Application number: CN202120687117.7U
Authority: CN
Inventors: 刘永; 杨亚鹏; 赵钢; 黄朕; 黄凯
Original assignee: Henan Hejing Cleaning Technology Co ltd
Current assignee: Henan Hejing Cleaning Technology Co ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2021-10-22
Anticipated expiration: 2031-04-06

Abstract

The utility model discloses a be fit for low concentration nitrogen oxide adsorbing material's detecting system belongs to the technical field that inorganic waste gas adsorbs the detection. The detection system consists of a nitrogen oxide gas generation section, a nitrogen oxide adsorption section and a negative pressure fan which are sequentially connected according to the flowing direction of the airflow; the nitrogen oxide gas generation section is formed by connecting a nitrogen oxide gas branch and a clean air gas branch in parallel and then connecting an inlet of a mixed gas cylinder, and an outlet of the mixed gas cylinder and an outlet of the humidifier are connected with the nitrogen oxide adsorption section in parallel through a gas pipe; the nitrogen oxide adsorption section consists of an upstream air inlet section, an adsorption box filled with adsorption materials and a downstream air outlet section which are arranged end to end in sequence. Utilize the utility model discloses can detect out adsorption efficiency and the adsorption capacity of adsorption material under the different work condition, learn the adsorption efficiency of adsorption material, confirm the economic nature of service condition, life, analysis adsorbent of adsorbent, select suitable adsorption material to provide the scientific reference under the different work condition.

Description

Detection system suitable for low-concentration nitrogen oxide adsorption material

Technical Field

The utility model belongs to the technical field of inorganic waste gas adsorbs the detection, more specifically say and relate to a detecting system who is fit for low concentration nitrogen oxide adsorbing material.

Background

At present, many researches on removal of nitrogen oxides are carried out, but the researches mainly aim at nitrogen oxides generated at high temperature such as combustion furnaces, engines and the like, the emission characteristics of the nitrogen oxides are high temperature and high concentration, a reducing agent catalytic reduction or high temperature reduction method is mainly adopted for treatment before emission, and the technology is relatively mature. However, for nitrogen oxides contained in exhaust gas discharged by automobiles in highway tunnels, the discharge characteristics of the nitrogen oxides are normal temperature and low concentration, and the nitrogen oxides are not suitable for adopting the traditional catalytic reduction or high temperature reduction technology, and practice proves that adsorption of the normal temperature and low concentration nitrogen oxides by the adsorption material is one of feasible treatment technologies, but a test system for effectively detecting the adsorption capacity of the adsorption material is absent at present, so scientific reference cannot be provided for selecting corresponding proper adsorption materials under different working conditions, and therefore a detection system suitable for low concentration nitrogen oxide adsorption materials is required to be designed for testing the adsorption capacities of different adsorption materials.

Disclosure of Invention

The purpose of the utility model is just to the weak point that exists among the above-mentioned prior art and the detecting system who is fit for low concentration nitrogen oxide adsorbing material that provides. Utilize the utility model discloses can detect out low concentration nitrogen oxide adsorbing material's adsorption efficiency and adsorption capacity under the different work condition, learn the adsorption efficiency of adsorbing material under the corresponding condition, confirm the economic nature of service condition, life and the analysis adsorbent of adsorbent, select to correspond suitable adsorbing material and provide the scientific reference under the different work condition, the utility model discloses still have simple structure, convenient operation, use nimble advantage.

The purpose of the utility model can be realized by the following technical measures:

the utility model discloses a detection system suitable for low concentration nitrogen oxide adsorption material comprises a nitrogen oxide gas generation section, a nitrogen oxide adsorption section and a negative pressure fan which are connected in sequence according to the airflow flowing direction (the nitrogen oxide gas generation section is used for providing target gas, the nitrogen oxide adsorption section is used for adsorbing nitrogen oxide in the target gas, and the negative pressure fan provides airflow power); the nitrogen oxide gas generation section is characterized in that a nitrogen oxide gas branch and a clean air gas branch are connected in parallel and then communicated with an inlet of a mixed gas cylinder (low-concentration nitrogen oxide gas serving as target gas is obtained after high-concentration nitrogen oxide is mixed with clean air, compared with the method of directly adopting low-concentration nitrogen oxide gas as target gas, the trouble of frequently replacing the gas cylinder is saved, and the detection cost is greatly reduced), an outlet of the mixed gas cylinder and an outlet of a humidifier are communicated with a nitrogen oxide adsorption section in parallel through a gas pipe (the target gas is humidified, the influence of the detection humidity factor on the adsorption capacity of an adsorption material is detected, and particularly the generation of high-humidity gas is considered); the nitrogen oxide adsorption section consists of an upstream air inlet section, an adsorption box internally provided with an adsorption material and a downstream air outlet section which are sequentially arranged from head to tail, wherein the upstream air inlet section comprises an air inlet hose and an air inlet straight pipe which are sequentially connected, and a wire mesh embedded at the outlet end of the air inlet straight pipe (the function is to intercept vaporous liquid water in high-humidity gas and eliminate the interference of the liquid water on the adsorption capacity of the adsorption material, the function is to equalize the flow of the passing gas so as to be convenient for the uniform adsorption of subsequent adsorption materials), a heating belt wound on the periphery of the air inlet straight pipe and heat insulation cotton (the heating belt is used for heating target gas, the influence of temperature factors on the adsorption capacity of the adsorption material is detected, particularly the generation of high-temperature gas is considered, the heat insulation cotton can ensure that the temperature of the gas in the pipeline is relatively constant and reduce fluctuation, namely, the temperature of low-concentration nitrogen oxide gas which is sequentially output after heating is basically constant), the adsorption tank is a box-type shell formed by welding an upstream positive cone variable-diameter shell, a middle columnar shell and a downstream inverted cone variable-diameter shell, and the downstream air outlet section comprises a downstream air outlet straight pipe and an air outlet hose which are sequentially connected; the inlet end of the air inlet hose is simultaneously communicated with the outlet of the mixed gas cylinder and the outlet of the humidifier (the detected target gas needs certain temperature and humidity), and the outlet end of the air outlet hose is connected with the negative pressure fan.

The utility model discloses in the gaseous branch road of nitrogen oxide is by the branch road that constitutes after nitrogen oxide gas cylinder, needle type micro-regulating valve, mass flow meter I communicate in proper order through the trachea (because the splendid attire is high concentration nitrogen oxide in the nitrogen oxide gas cylinder, need obtain low concentration nitrogen oxide gas as the target gas with the clean air mixture back of another branch road, consequently installation needle type micro-regulating valve can accurate control nitrogen oxide gas's output quantity in this branch road-can control the gaseous stable output of low discharge under 10 MPa's high pressure promptly, guarantee the stability and the uniformity of output nitrogen oxide concentration).

The utility model discloses in the clean air gas branch road is the branch road that constitutes after communicating in proper order through the trachea by air compressor machine, mass flow meter II (this branch road is used for providing clean air steadily, obtains low concentration nitrogen oxide gas as the target gas with the high concentration nitrogen oxide of another branch road with after mixing).

In the utility model, an upstream sampling hole (convenient for sampling the upstream gas) is preset on the gas inlet straight pipe, and a downstream sampling hole (convenient for sampling the downstream gas) is preset on the downstream gas outlet straight pipe; an upstream pressure detection hole and a downstream pressure detection hole are respectively preset at the front section and the rear section of the middle columnar shell (an external pressure gauge is conveniently and quickly communicated for pressure test); the top of the middle cylindrical shell is provided with a top cover which is convenient to detach (the top cover is opened, and the movable plate and the adsorbing material are convenient to mount or replace).

The utility model discloses in the water bath of flourishing thermostatted water including gas cylinder places (guarantee that the gas that comes from two branches mixes under the same temperature basically, guarantee promptly that the low concentration nitrogen oxide gas temperature that exports in proper order after mixing is invariable basically).

In the utility model, a plurality of clamping grooves for clamping and embedding the movable plates are arranged in parallel in the inner cavity of the middle cylindrical shell (the clamping grooves are used for clamping and embedding the movable plates, and the adjacent two movable plates and the inner cavity of the middle cylindrical shell enclose a layer of adsorption bed for clamping and embedding the adsorption material); the movable plate is of a screen mesh structure (the screen mesh structure is convenient for gas circulation) consisting of a frame and an inner mesh, and the mesh size of the inner mesh is smaller than the particle size of the adsorption material (the adsorption material is guaranteed to be embedded and fixed in the range of the corresponding layer of adsorption bed).

In the utility model, the heating belt is uniformly wound on the outer wall of the air inlet straight pipe in a spiral shape (the air inlet straight pipe and the air passing through the section are uniformly heated), and the power of the heating belt can be adjusted (the air inlet temperature is adjusted and controlled) as required within the use range; the heat preservation cotton is wrapped on the periphery of the heating belt (ensuring that the temperature of the gas in the pipeline is relatively constant).

The design principle of the utility model is as follows:

utilize the utility model discloses can detect out low concentration nitrogen oxide adsorbing material's adsorption efficiency and adsorption capacity under the different work condition, learn the adsorption efficiency of adsorbing material under the corresponding condition, confirm the economic nature of service condition, life and the analysis adsorbent of adsorbent, select to correspond suitable adsorbing material and provide the scientific reference under the different work condition. More specifically, utilize the utility model discloses mainly detect adsorption efficiency, the adsorption capacity of adsorption material to low concentration nitrogen oxide under specific temperature and humidity experimental conditions, especially considered high temperature, high humid gas's emergence, got rid of the interference of liquid water to the adsorbent performance, considered detecting system air current homogeneity. The concrete embodiment is as follows: the utility model discloses the design has nitrogen oxide gas to take place the section and provides the target gas, obtains the low concentration nitrogen oxide gas as the target gas after mixing with clean air promptly with high concentration nitrogen oxide, compares as the target gas with directly adopting low concentration nitrogen oxide gas, has saved trouble, the greatly reduced detection cost of often changing the gas cylinder. In order to detect the influence of the humidity factor on the adsorption capacity of the adsorption material, the target gas is humidified by communicating the outlet of the humidifier in a parallel mode before entering the nitrogen oxide adsorption section; and in order to eliminate the interference of liquid water on the performance of the adsorbent, a wire mesh is embedded in the outlet end of the gas inlet straight pipe to intercept the vaporific liquid water in the high-humidity gas, and meanwhile, the wire mesh can also flow equally the passing gas, so that the subsequent adsorption material can be conveniently and uniformly adsorbed. In order to detect the influence of temperature factors on the adsorption capacity of the adsorption material, particularly considering the generation of high-temperature gas, a heating belt is wound on the periphery of the gas inlet straight pipe to heat the target gas, and heat insulation cotton is wrapped on the periphery of the heating belt to ensure that the temperature of the gas in the pipeline is relatively constant and reduce fluctuation.

In addition, in order to guarantee gaseous smooth and easy circulation and fixed adsorption material, the utility model designs a screen cloth structure's movable plate, and two adjacent movable plates enclose into the one deck with the inner chamber of middle column casing and be used for the adsorption bed of inlay card adsorption material to can design the number of piles of adsorption bed according to the in-service use condition. In order to facilitate sampling, the utility model is provided with an upstream sampling hole on the air inlet straight pipe and a downstream sampling hole on the downstream air outlet straight pipe; for the convenience of detecting pressure at any time, the utility model discloses upstream pressure detection hole and low reaches pressure detection hole have been preset respectively to the front and back section of middle column casing. For convenient installation or change movable plate and adsorbing material, the utility model discloses the top cap of convenient to detach is designed at the top of middle column casing. Therefore, the utility model discloses still have simple structure, convenient operation, use nimble advantage.

The utility model has the advantages of as follows:

utilize the utility model discloses can detect out low concentration nitrogen oxide adsorbing material's adsorption efficiency and adsorption capacity under the different work condition, learn the adsorption efficiency of adsorbing material under the corresponding condition, confirm the economic nature of service condition, life and the analysis adsorbent of adsorbent, select to correspond suitable adsorbing material and provide the scientific reference under the different work condition, the utility model discloses still have simple structure, convenient operation, use nimble advantage.

Drawings

Fig. 1 is a schematic view of the connection structure of the present invention.

Fig. 2 is a schematic perspective view of the nitrogen oxide adsorption section of the present invention.

Fig. 3 is a schematic structural diagram of the middle moving plate of the present invention.

The sequence numbers in the figures illustrate: 1. nitrogen oxide gas cylinder, 2, needle type micro-regulating valve, 3, mass flowmeter I, 4, upstream sampling hole, 5, wire mesh, 6, upstream positive cone reducing shell, 7, upstream pressure detecting hole, 8, middle column shell, 9, adsorbing material, 10, downstream pressure detecting hole, 11, downstream inverted cone reducing shell, 12, downstream air outlet straight pipe, 13, downstream sampling hole, 14, air outlet hose, 15, negative pressure fan, 16, air compressor, 17, mass flowmeter II, 18, mixed gas cylinder, 19, humidifier, 20, air inlet hose, 21, heating belt, 22, air inlet straight pipe, 23, moving plate, 23-1, frame, 23-2, intranet, 24, clamping groove, 25, water bath, 26, heat preservation cotton, 27 and top cover.

Detailed Description

The invention will be further described with reference to the accompanying drawings:

as shown in fig. 1 to 3, a detection system suitable for a low concentration nitrogen oxide adsorption material of the present invention is composed of a nitrogen oxide gas generation section, a nitrogen oxide adsorption section and a negative pressure fan 15 (the nitrogen oxide gas generation section is used for providing a target gas, the nitrogen oxide adsorption section is used for adsorbing nitrogen oxide in the target gas, and the negative pressure fan 15 provides airflow power) which are connected in sequence according to an airflow direction; the nitrogen oxide gas generation section is formed by connecting a nitrogen oxide gas branch and a clean air gas branch in parallel and then connecting an inlet of a mixed gas cylinder 18 (a low-concentration nitrogen oxide gas as a target gas is obtained by mixing high-concentration nitrogen oxide and clean air, compared with the method of directly adopting the low-concentration nitrogen oxide gas as the target gas, the trouble of frequently replacing the gas cylinder is saved, and the detection cost is greatly reduced), and an outlet of the mixed gas cylinder 18 and an outlet of a humidifier 19 are connected in parallel through a gas pipe to connect a nitrogen oxide adsorption section (the target gas is humidified, the influence of the detection humidity factor on the adsorption capacity of an adsorption material is detected, and particularly the generation of high-humidity gas is considered); the nitrogen oxide adsorption section consists of an upstream air inlet section, an adsorption box in which an adsorption material 9 is arranged, and a downstream air outlet section which are sequentially arranged from head to tail, wherein the upstream air inlet section comprises an air inlet hose 20, an air inlet straight pipe 22 and a metal wire mesh 5 embedded at the outlet end of the air inlet straight pipe 22 (the function is to intercept mist liquid water in high-humidity gas and eliminate the interference of the liquid water on the adsorption capacity of the adsorption material, the function is to equalize the flow of the passing gas so as to facilitate the uniform adsorption of the subsequent adsorption material), a heating belt 21 and heat insulation cotton 26 are wound on the periphery of the air inlet straight pipe (the heating belt 21 is used for heating the target gas and detecting the influence of temperature factors on the adsorption capacity of the adsorption material, particularly considering the generation of high-temperature gas, and the heat insulation cotton 26 can ensure that the temperature of the gas in the pipeline is relatively constant and reduce fluctuation, namely ensure that the temperature of low-concentration nitrogen oxide gas which is sequentially output after heating is basically constant), the adsorption box is a box-type shell formed by welding an upstream positive cone variable diameter shell 6, a middle columnar shell 8 and a downstream inverted cone variable diameter shell 11, and a downstream air outlet section comprises a downstream air outlet straight pipe 12 and an air outlet hose 14 which are sequentially connected; the inlet end of the inlet hose 20 is simultaneously connected to the outlet of the mixed gas cylinder 18 and the outlet of the humidifier 19 (the target gas to be detected needs a certain temperature and humidity), and the outlet end of the outlet hose 14 is connected to the negative pressure fan 15.

The utility model discloses in nitrogen oxide gas branch road is by nitrogen oxide gas cylinder 1, needle type micro-regulating valve 2, the branch road that constitutes after mass flow meter I3 communicates through the trachea in proper order (because the splendid attire is high concentration nitrogen oxide in nitrogen oxide gas cylinder 1, need obtain low concentration nitrogen oxide gas after mixing with the clean air of another branch road and regard as the target gas, consequently installation needle type micro-regulating valve 2 can accurate control nitrogen oxide gas's output quantity in this branch road-can control little flow gaseous stable output under 10 MPa's high pressure promptly, guarantee the stability and the uniformity of output nitrogen oxide concentration).

The utility model discloses in the clean air gas branch road is the branch road that constitutes after communicating in proper order through the trachea by air compressor machine 16, mass flow meter II 17 (this branch road is used for providing clean air steadily, obtains low concentration nitrogen oxide gas as the target gas after with the high concentration nitrogen oxide of another branch road and the mixture).

In the utility model, an upstream sampling hole 4 (convenient for sampling upstream gas) is preset on the air inlet straight pipe 22, and a downstream sampling hole 13 (convenient for sampling downstream gas) is preset on the downstream air outlet straight pipe 12; an upstream pressure detection hole 7 and a downstream pressure detection hole 10 are respectively preset at the front section and the rear section of the middle cylindrical shell 8 (the pressure test can be conveniently and quickly communicated with an external pressure gauge); the top of the middle cylindrical shell 8 is designed with a top cover 27 which is convenient to detach (the top cover 27 is opened, and the moving plate 23 and the adsorbing material 9 are convenient to mount or replace).

The utility model discloses in mixed gas bottle 18 places in the water bath 25 of flourishing thermostatted water including (guarantee that the gas that comes from two branches mixes under the same temperature basically, guarantee promptly that the low concentration nitrogen oxide gas temperature that exports in proper order after mixing is invariable basically).

In the utility model, a plurality of clamping grooves 24 for clamping and embedding the moving plate 23 are arranged in parallel in the inner cavity of the middle cylindrical shell 8 (the clamping grooves 24 are used for clamping and embedding the moving plate 23, and the inner cavities of two adjacent moving plates 23 and the middle cylindrical shell 8 enclose a layer of adsorption bed for clamping and embedding the adsorption material 9); the moving plate 23 is a screen structure (the screen structure facilitates the circulation of gas) composed of a frame 23-1 and an inner net 23-2, and the mesh size of the inner net 23-2 is smaller than the particle size of the adsorbing material 9 (the adsorbing material 9 is ensured to be embedded and fixed in the range of the corresponding layer of the adsorption bed).

In the utility model, the heating belt 21 is uniformly wound on the outer wall of the air inlet straight pipe 22 in a spiral shape (ensuring that the air inlet straight pipe 22 and the air passing through the section are uniformly heated), and the power of the heating belt 21 can be adjusted (adjusting and controlling the air inlet temperature) as required within the application range; the insulation cotton 26 is wrapped around the heating belt 21 (to ensure the gas temperature in the pipeline is relatively constant).

The utility model discloses a concrete in service behavior as follows:

firstly, the utility model is connected according to the air flow direction and by referring to the structural description and the attached drawings; then, inserting the frames 23-1 of the corresponding number of the moving plates 23 into the clamping grooves 24 of the inner cavity of the middle cylindrical shell 8 according to actual needs, and enclosing a layer of adsorption bed by every two adjacent moving plates 23 and the inner cavity of the middle cylindrical shell 8; then, the adsorbing material 9 is filled into the corresponding adsorption bed space; subsequently, the upper lid 27 is fastened and is pressed and sealed by a fastening member such as a bolt; then, the negative pressure fan 15 is started to make the whole gas channel in a negative pressure state; then, the air compressor 16 is started, the cylinder valve of the nitrogen oxide gas cylinder 1 is opened, the knob of the needle type micro-regulating valve 2 is regulated, and the gas concentration is regulated to reach a preset value; and finally, after the system is stabilized, sampling is carried out on the upstream sampling hole 4 and the downstream sampling hole 13 at the same time, and the upstream pressure detection hole 7 and the downstream pressure detection hole 10 are communicated with an external pressure gauge for pressure testing, so that the adsorption efficiency of the adsorption material on the nitrogen oxide is evaluated.

Claims

1. A detection system suitable for low-concentration nitrogen oxide adsorbing materials is characterized in that: the detection system is composed of a nitrogen oxide gas generation section, a nitrogen oxide adsorption section and a negative pressure fan (15) which are sequentially connected according to the flowing direction of the air flow; the nitrogen oxide gas generation section is formed by connecting a nitrogen oxide gas branch and a clean air gas branch in parallel and then connecting an inlet of a mixed gas cylinder (18), and an outlet of the mixed gas cylinder (18) and an outlet of a humidifier (19) are communicated with a nitrogen oxide adsorption section in parallel through gas pipes; the nitrogen oxide adsorption section consists of an upstream air inlet section, an adsorption box internally provided with an adsorption material (9) and a downstream air outlet section which are sequentially arranged from head to tail, wherein the upstream air inlet section comprises an air inlet hose (20) and an air inlet straight pipe (22) which are sequentially connected, a wire mesh (5) embedded at the outlet end of the air inlet straight pipe (22), a heating belt (21) and heat insulation cotton (26) which are wound on the periphery of the air inlet straight pipe, the adsorption box is a box-type shell which is formed by welding an upstream positive cone variable-diameter shell (6), a middle columnar shell (8) and a downstream inverted cone variable-diameter shell (11), and the downstream air outlet section comprises a downstream air outlet straight pipe (12) and an air outlet hose (14) which are sequentially connected; the inlet end of the air inlet hose (20) is simultaneously communicated with the outlet of the mixed gas bottle (18) and the outlet of the humidifier (19), and the outlet end of the air outlet hose (14) is connected with the negative pressure fan (15).

2. The detection system according to claim 1, wherein the detection system is adapted to detect a low concentration of the nox adsorbent material, and wherein: the nitrogen oxide gas branch is formed by sequentially communicating a nitrogen oxide gas cylinder (1), a needle type micro-regulating valve (2) and a mass flow meter I (3) through a gas pipe.

3. The detection system according to claim 1, wherein the detection system is adapted to detect a low concentration of the nox adsorbent material, and wherein: the clean air gas branch is formed by sequentially communicating an air compressor (16) and a mass flow meter II (17) through an air pipe.

4. The detection system according to claim 1, wherein the detection system is adapted to detect a low concentration of the nox adsorbent material, and wherein: an upstream sampling hole (4) is preset on the air inlet straight pipe (22), and a downstream sampling hole (13) is preset on the downstream air outlet straight pipe (12); an upstream pressure detection hole (7) and a downstream pressure detection hole (10) are respectively preset at the front section and the rear section of the middle cylindrical shell (8); the middle cylindrical shell (8) is formed by combining a fixed shell and a top cover (27) which is convenient to disassemble.

5. The detection system according to claim 1, wherein the detection system is adapted to detect a low concentration of the nox adsorbent material, and wherein: the mixed gas bottle (18) is placed in a water bath (25) containing constant-temperature water.

6. The detection system according to claim 1, wherein the detection system is adapted to detect a low concentration of the nox adsorbent material, and wherein: a plurality of clamping grooves (24) for clamping and embedding the moving plate (23) are arranged in parallel in the inner cavity of the middle cylindrical shell (8); the moving plate (23) is of a screen mesh structure consisting of a frame (23-1) and an inner mesh (23-2), and the mesh size of the inner mesh (23-2) is smaller than the particle size of the adsorbing material (9).

7. The detection system according to claim 1, wherein the detection system is adapted to detect a low concentration of the nox adsorbent material, and wherein: the heating belt (21) is uniformly wound on the outer wall of the air inlet straight pipe (22) in a spiral shape, and the power of the heating belt (21) can be adjusted as required within the use range; the heat insulation cotton (26) is wrapped on the periphery of the heating belt (21).