Slow flow hedging self-protection gas closed sampling system

Abstract

The invention discloses a slow flow hedging self-protection gas closed sampling system which comprises a closed box, a sampling pipe and a sampling bottle, and the sampling bottle is in butt joint with the sampling pipe; an outer enclosure is arranged on the periphery of the sampling bottle, and a gas distribution interlayer is formed between the outer enclosure and the sampling bottle; a buffer block and a buffer microporous plate are arranged in the sampling bottle at intervals from a bottle inlet to a bottle outlet, and the internal space of the sampling bottle is divided into an initial buffer bottle section, a split-flow opposite-flushing bottle section and a tail-end gas storage bottle section in the gas axial flow guide direction; the initial surge flask section is communicated with the gas distribution interlayer through gas homogenizing holes; the gas distribution interlayer is communicated with the flow dividing and bottle punching section through the flow dividing and bottle punching holes, and the flow dividing and bottle punching section is communicated with the tail end gas storage bottle section through the buffering micropores. Gas is buffered, shunted and mutually headed, so that the gas flow rate and consumption disturbance can be reduced, the impact on the inner wall of the sampling bottle is reduced, and the stability of the sampling process is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of closed gas sampling, and in particular relates to a slow-flow hedging self-protection closed gas sampling system. Background Art

[0002] In the closed sampling of coal gas, the traditional sampling device does not control the coal gas flow rate precisely enough, and a flow rate that is too fast or too slow will affect the representativeness of the sample. For example, in the sampling of industrial coke oven gas, due to the complex composition of coke oven gas and the large number of detection components, improper flow rate control will lead to inaccurate sampling volume, which in turn affects the analysis results. In addition, during the sampling process, when the coal gas enters the sampling bottle, it is easy to generate airflow disturbances and eddies, making the sample uneven and generating large pressure fluctuations, which reduces the accuracy of sampling. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a slow-flow hedging self-protection coal gas closed sampling system, which can reduce the coal gas flow rate and consumption disturbance by buffering and diverting the coal gas to offset each other, reduce the impact on the inner wall of the sampling bottle, and improve the stability of the sampling process.

[0004] Technical solution: To achieve the above purpose, a slow-flow hedging self-protection coal gas closed sampling system of the present invention comprises a closed box, a sampling tube and a sampling bottle. The sampling tube is arranged in the closed box from the air inlet to the air return port, and the sampling bottle is docked on the sampling tube;

[0005] The outer periphery of the sampling bottle is provided with an outer enclosure that fully wraps in the circumferential direction and partially wraps in the axial direction at a position near the bottle inlet, and a gas distribution interlayer is formed between the outer enclosure and the sampling bottle; buffer blocks and buffer microporous plates are provided in the sampling bottle from the bottle inlet to the bottle outlet, and the internal space of the sampling bottle is divided into an initial buffer bottle section, a diversion and hedging bottle section and a terminal gas storage bottle section in the axial flow direction of the coal gas; the bottle body of the initial buffer bottle section is provided with a uniform air hole, and the initial buffer bottle section is connected to the gas distribution interlayer through the uniform air hole;

[0006] The bottle body of the diversion and counter-flow bottle section is provided with a diversion and counter-flow hole, and the gas distribution interlayer is connected to the diversion and counter-flow bottle section through the diversion and counter-flow hole, so that the gas flows ejected from the diversion and counter-flow hole counter-flow each other in the diversion and counter-flow bottle section;

[0007] The buffer microporous plate is provided with buffer micropores penetrating the plate body, and the diversion and counter-flow bottle section is connected to the end gas storage bottle section through the buffer micropores.

[0008] Furthermore, the buffer block is arranged near the bottle inlet of the sampling bottle, and its outer shape structure is a conical structure with the tip facing the bottle inlet, and the side surface of the conical buffer block is a frosted structure surface densely covered with gas-blocking particles.

[0009] Furthermore, the sampling bottle is a cylindrical bottle, and a plurality of the uniform air holes are arranged in a circular array close to the edge of the frosted structural surface of the buffer block.

[0010] Furthermore, a plurality of the diversion counter-punching holes are distributed in a circular array and a linear array in the circumferential direction and axial direction of the diversion counter-punching bottle segment, respectively, and the number of the diversion counter-punching holes in a circle distributed in the circumferential direction of the diversion counter-punching bottle segment is an even number, so that the two diversion counter-punching holes in each circle are opposite to each other in the radial direction, so that the two gas flows ejected from the two diversion counter-punching holes are positively collided.

[0011] Furthermore, the volume of the initial buffer bottle section is V 1 The volume of the diversion and flushing bottle section is V 2 , the volume of the terminal gas storage cylinder section is V 3 , the three satisfy the relationship: V 1 <V 2 <V 3 .

[0012] Furthermore, the pore size of the uniform air hole is d 1 The aperture of the split-flow punch hole is d 2 The pore size of the buffer micropore is d 3 , the three satisfy the relationship: d 1 >d 2 >d 3 , forming a three-level filter pore structure that can filter solid impurities contained in coal gas step by step.

[0013] Furthermore, a backflush pipe with a backflush valve is connected to the sampling tube, and clean gas is injected through the backflush pipe to backflush the sampling bottle, thereby removing solid impurities accumulated in the diversion and hedging bottle section, the gas distribution interlayer and the initial buffer bottle section in order from small to large.

[0014] Furthermore, a flame retardant gas pipe with a flame retardant gas valve is installed on the closed box, and flame retardant gas is injected into the closed box through the flame retardant gas pipe to form a closed flame retardant atmosphere environment, and the sampling tube and the sampling bottle are both in the flame retardant atmosphere environment; an inlet valve and a return valve are provided on the sampling tube, and the sampling bottle is installed on the sampling tube through a bottle inlet valve and a bottle outlet valve, and a pressure gauge is also provided between the bottle outlet of the sampling bottle and the bottle outlet valve.

[0015] Furthermore, a heat exchange tube group is provided in the closed box for exchanging heat with the flame retardant atmosphere to adjust the ambient temperature of the flame retardant atmosphere in the box, and the heat exchange tube group is integrated on the box wall of the closed box.

[0016] Furthermore, the sampling tube is connected to a pressure relief tube in parallel with the sampling bottle, a pressure relief valve is installed on the pressure relief tube, and a sampling circulation pump located between the inlet valve and the pressure relief tube is installed on the sampling tube.

[0017] Beneficial effects: The present invention can reduce the gas flow rate and consumption disturbance by buffering and diverting the gas to offset each other, reduce the impact on the inner wall of the sampling bottle, and improve the stability of the sampling process and the sampling accuracy; wherein, the gas distribution interlayer can make the gas evenly distributed at the initial stage of entering the sampling bottle, reducing the direct impact on the inner wall of the sampling bottle; the buffer block can slow down the gas flow rate, and the buffer microporous plate can further reduce the flow rate and make the gas flow evenly distributed, reduce sample disturbance, and improve the representativeness and accuracy of the sample; the diversion and offset holes make the gas flow in the gas distribution interlayer offset each other in the diversion and offset bottle section, eliminating eddy currents and disturbances in the airflow, making the airflow more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the structure of each pipeline, valve and sampling bottle in the closed box;

[0020] Figure 3 It is a schematic diagram of the radially cut structure of the sampling bottle;

[0021] Figure 4 This is a schematic diagram of the axial cross-section structure of the sampling bottle. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] like Figure 1 and Figure 2 As shown, a slow-flow hedging self-protection coal gas closed sampling system comprises a closed box 1, a sampling tube 2 and a sampling bottle 3. The sampling tube 2 is arranged in the closed box 1 from the air inlet to the air return port, and the sampling bottle 3 is docked on the sampling tube 2; Figure 2 and Figure 3As shown, the outer periphery of the sampling bottle 3 is provided with an outer enclosure 17 which is fully wrapped in the circumferential direction and partially wrapped in the axial direction near the bottle inlet, and a gas distribution interlayer 18 is formed between the outer enclosure 17 and the sampling bottle 3; the sampling bottle 3 is provided with a buffer block 19 and a buffer microporous plate 20 at intervals from the bottle inlet to the bottle outlet, so as to divide the internal space of the sampling bottle 3 into an initial buffer bottle section 3a, a diversion and hedging bottle section 3b and a terminal gas storage bottle section 3c in the axial flow direction of the coal gas; the initial buffer bottle section 3a is opened on the bottle body An air-uniform hole 31 is provided, and the initial buffer bottle section 3a is connected to the air distribution interlayer 18 through the air-uniform hole 31; a diversion counter-punching hole 32 is opened on the bottle body of the diversion counter-punching bottle section 3b, and the air distribution interlayer 18 is connected to the diversion counter-punching bottle section 3b through the diversion counter-punching hole 32, so that the gas flow ejected from the diversion counter-punching hole 32 in the diversion counter-punching bottle section 3b offsets each other; the buffer microporous plate 20 has buffer micropores 33 that penetrate the plate body, and the diversion counter-punching bottle section 3b is connected to the terminal gas storage bottle section 3c through the buffer micropores. The outer enclosure 17 arranged on the periphery of the sampling bottle 3 forms a gas distribution interlayer 18 with the sampling bottle 3, which can make the coal gas evenly distributed in the gas distribution interlayer 18 at the initial stage of entering the sampling bottle 3, reduce the direct impact on the inner wall of the sampling bottle 3, reduce the risk of sample contamination, and improve the sampling accuracy; the buffer block 19 and the buffer microporous plate 20 divide the internal space of the sampling bottle 3 into different functional sections, the buffer block 19 can slow down the gas flow rate, and the buffer microporous plate 20 further reduces the flow rate and makes the gas flow evenly distributed, reduces sample disturbance, and improves the representativeness and accuracy of the sample; the diversion counter-punching hole 32 makes the gas flow in the gas distribution interlayer 18 counter-punch each other in the diversion counter-punching bottle section 3b, and this counter-punching effect can effectively eliminate the eddy current and disturbance in the gas flow, make the gas flow more stable, and reduce the disturbance and pollution of the sample. In summary, the present invention can reduce the gas flow rate and consumption disturbance, reduce the impact on the inner wall of the sampling bottle, and improve the stability and sampling accuracy of the sampling process by buffering and diverting the gas.

[0024] like Figure 3 As shown, the buffer block 19 is arranged near the bottle inlet of the sampling bottle 3, and its external structure is a conical structure with the tip facing the bottle inlet, so that it can better guide the gas flow, and the side surface of the buffer block 19 with a conical structure is a frosted structural surface 40 densely covered with gas-blocking particles, which helps to further reduce the flow rate.

[0025] More specifically, the sampling bottle 3 is a cylindrical bottle, and a plurality of the gas-uniform holes 31 are arranged in a circular array near the edge of the frosted structural surface 40 of the buffer block 19 , so that the coal gas can enter the gas distribution interlayer 18 evenly.

[0026] It is worth noting that the plurality of diversion counter-punching holes 32 are distributed in a circular array and a linear array in the circumferential and axial directions of the diversion counter-punching bottle segment 3b, respectively. The number of the diversion counter-punching holes 32 in a circle distributed circumferentially of the diversion counter-punching bottle segment 3b is an even number, so that the two diversion counter-punching holes 32 in each circle are opposite to each other in the radial direction, so that the two gas flows ejected from the two diversion counter-punching holes 32 are positively collided, and the uniform collision of the gas in the diversion counter-punching bottle segment 3b is ensured, thereby improving the stability of the sampling process and the uniformity of the sample.

[0027] The volume of the initial buffer bottle section 3a is V 1 The volume of the diversion and flushing bottle section 3b is V 2 The volume of the terminal gas storage cylinder section 3c is V 3 , the three satisfy the relationship: V 1 <V 2 <V 3 . Among them, the volume of the initial buffer bottle section 3a is the smallest. After entering the sampling bottle 3, the coal gas will be quickly guided into the diversion and hedging bottle section 3b, and preliminary buffering and diversion hedging will be carried out in a smaller space, which is helpful to eliminate large-scale disturbances and unevenness in the airflow, making the gas flow rate and pressure distribution more uniform, creating good conditions for subsequent diversion hedging and microporous buffering; the volume of the diversion and hedging bottle section 3b is moderate. In this section, after the coal gas flows through the diversion and hedging holes 32, there is enough space for mutual hedging. This hedging effect can further eliminate eddies and small-scale disturbances in the airflow, making the gas flow more stable; the volume of the terminal gas storage bottle section 3c is the largest, providing sufficient space for storage and stabilization of the coal gas after diversion hedging and buffer microporous filtration. The larger volume helps to reduce the flow rate of the gas in the gas storage bottle section 3c, so that the sample stays in the bottle longer, which is conducive to further stabilization of the sample. Therefore, the volume relationship V 1 <V 2 <V 3 The design makes the flow process of the gas in the sampling bottle 3 more reasonable, effectively improves the stability and uniformity of the sample, enhances the diversion and hedging effect, optimizes the gas storage and sample collection, and improves the accuracy and representativeness of the sampling.

[0028] The diameter of the gas-uniform hole 31 is d 1 The aperture of the split flow punch hole 32 is d 2 The aperture of the buffer micropore 33 is d 3 , the three satisfy the relationship: d 1 >d 2 >d 3 , forming a three-level filter pore structure that can filter solid impurities contained in coal gas step by step. The structural design of each pore is not only applied to the process of slowing down the flow of coal gas and consuming air flow disturbance, but also in the process of coal gas sampling, based on the pore size relationship d 1>d 2 >d 3 It can filter the solid impurities contained in the coal gas step by step to ensure the purity of the coal gas sampling. High-purity samples can more accurately reflect the true nature and composition of the coal gas, improve the accuracy of sampling, and provide a reliable basis for subsequent analysis and detection.

[0029] The sampling tube 2 is connected to a backflush tube 8 with a backflush valve 9, through which clean gas is injected to backflush the sampling bottle 3, and solid impurities accumulated in the diversion and countervailing bottle section 3b, the air distribution interlayer 18 and the initial buffer bottle section 3a are removed in order from small to large. By injecting clean gas through the backflush tube to backflush the sampling bottle, solid impurities in the sampling bottle can be effectively removed, blockage and pollution can be avoided, and the service life of the sampling system can be extended. Based on the aperture relationship d 1 >d 2 >d 3 The back-flushing cleaning effect is obvious. The hole structure of the sampling bottle 3 is involved in the filtering and back-flushing process, so there is no need to install a filter at the air inlet of the sampling tube 2, the structure is simpler, and the cost is reduced.

[0030] like Figure 1 As shown, the closed box 1 is equipped with a flame retardant gas pipe 6 with a flame retardant gas valve 7, and flame retardant gas is injected into the closed box 1 through the flame retardant gas pipe 6 to form a closed flame retardant atmosphere. The sampling tube 2 and the sampling bottle 3 are both in the flame retardant atmosphere, which effectively prevents the combustion or explosion of coal gas during the sampling process and ensures the safety of the sampling process; the sampling tube 2 is provided with an inlet valve 4 and a return valve 5, and the sampling bottle 3 is installed on the sampling tube 2 through a bottle inlet valve 13 and a bottle outlet valve 15, and a pressure gauge 14 is also provided between the bottle outlet of the sampling bottle 3 and the bottle outlet valve 15. Nitrogen, which has a relatively low cost, can be used as the flame retardant gas.

[0031] The closed box 1 is provided with a heat exchange tube group 16 for exchanging heat with the flame retardant atmosphere to adjust the ambient temperature of the flame retardant atmosphere in the box, and the heat exchange tube group 16 is integrated on the box wall of the closed box 1. A heat exchange medium is circulated in the heat exchange tube group 16 to exchange heat with the flame retardant atmosphere, adjust the temperature of the closed box 1, and prevent condensation of moisture contained in the coal gas.

[0032] The sampling tube 2 is connected to a pressure relief tube 10 in parallel with the sampling bottle 3. The pressure relief tube 10 is installed with a pressure relief valve 11, which can release pressure in time during the sampling process to prevent excessive pressure. The sampling tube 2 is installed with a sampling circulation pump 12 located between the inlet valve 4 and the pressure relief tube 10.

[0033] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A slow-flow hedging self-protection coal gas closed sampling system, comprising a closed box (1), a sampling tube (2) and a sampling bottle (3), wherein the sampling tube (2) is arranged in the closed box (1) from the air inlet to the air return port, and the sampling bottle (3) is docked on the sampling tube (2); Features: The outer circumference of the sampling bottle (3) is provided with an outer enclosure (17) which is fully wrapped in the circumferential direction and partially wrapped in the axial direction at a position close to the bottle inlet, and a gas distribution interlayer (18) is formed between the outer enclosure (17) and the sampling bottle (3); a buffer block (19) and a buffer microporous plate (20) are provided in the sampling bottle (3) at intervals from the bottle inlet to the bottle outlet, so as to divide the internal space of the sampling bottle (3) into an initial buffer bottle section (3a), a diversion and counter-flow bottle section (3b) and a terminal gas storage bottle section (3c) in the axial flow direction of the coal gas; a gas uniformity hole (31) is provided on the bottle body of the initial buffer bottle section (3a), and the initial buffer bottle section (3a) is connected to the gas distribution interlayer (18) through the gas uniformity hole (31); The body of the diversion and counter-punching bottle section (3b) is provided with a diversion and counter-punching hole (32), and the gas distribution interlayer (18) is connected to the diversion and counter-punching bottle section (3b) through the diversion and counter-punching hole (32), so that the gas flow ejected from the diversion and counter-punching hole (32) counter-punches each other in the diversion and counter-punching bottle section (3b); The buffer microporous plate (20) is provided with buffer micropores (33) penetrating the plate body, and the diversion and countervailing bottle section (3b) is connected to the terminal gas storage bottle section (3c) via the buffer micropores.

2. According to claim 1, a slow-flow hedging self-protection gas closed sampling system is characterized by: The buffer block (19) is arranged close to the bottle inlet of the sampling bottle (3), and its external structure is a conical structure with the tip facing the bottle inlet, and the side surface of the conical buffer block (19) is a frosted structure surface (40) densely covered with gas-blocking particles.

3. According to claim 2, a slow-flow hedging self-protection gas closed sampling system is characterized by: The sampling bottle (3) is a cylindrical bottle, and a plurality of the uniform air holes (31) are arranged in a circular array near the edge of the frosted structural surface (40) of the buffer block (19).

4. According to claim 3, a slow-flow hedging self-protection gas closed sampling system is characterized by: The plurality of diversion counter-punching holes (32) are respectively distributed in a circumferential array and a linear array in the circumferential direction and the axial direction of the diversion counter-punching bottle section (3b). The number of the diversion counter-punching holes (32) in a circle distributed in the circumferential direction of the diversion counter-punching bottle section (3b) is an even number, so that the two diversion counter-punching holes (32) in each circle are directly opposite in the radial direction, so that the two gas flows ejected from the two diversion counter-punching holes (32) are positively impacted.

5. According to claim 4, a slow-flow hedging self-protection gas closed sampling system is characterized by: The volume of the initial buffer bottle section (3a) is V1, the volume of the diversion and counter-flow bottle section (3b) is V2, and the volume of the terminal gas storage bottle section (3c) is V3, and the three satisfy the relationship: V1<V2<V3.

6. A slow-flow hedging self-protection coal gas closed sampling system according to claim 5, characterized in that: The aperture of the gas-uniform hole (31) is d1, the aperture of the flow-dividing counter-punching hole (32) is d2, and the aperture of the buffer micropore (33) is d3. The three satisfy the relationship: d1>d2>d3, forming a three-level filter pore structure capable of filtering solid impurities contained in coal gas step by step.

7. A slow-flow hedging self-protection coal gas closed sampling system according to claim 6, characterized in that: The sampling tube (2) is connected to a backflush tube (8) having a backflush valve (9), and clean gas is injected through the backflush tube (8) to backflush the sampling bottle (3), thereby removing solid impurities accumulated in the diversion and countervailing bottle section (3b), the gas distribution interlayer (18) and the initial buffer bottle section (3a) in order from small to large.

8. The slow-flow hedging self-protection coal gas closed sampling system according to claim 7 is characterized by: The closed box (1) is provided with a flame retardant gas pipe (6) having a flame retardant gas valve (7), and flame retardant gas is injected into the closed box (1) through the flame retardant gas pipe (6) to form a closed flame retardant atmosphere environment, and the sampling tube (2) and the sampling bottle (3) are both in the flame retardant atmosphere environment; the sampling tube (2) is provided with an inlet valve (4) and a return valve (5), and the sampling bottle (3) is installed on the sampling tube (2) through a bottle inlet valve (13) and a bottle outlet valve (15), and a pressure gauge (14) is also provided between the bottle outlet of the sampling bottle (3) and the bottle outlet valve (15).

9. A slow-flow hedging self-protection coal gas closed sampling system according to claim 8, characterized in that: The closed box (1) is provided with a heat exchange tube group (16) for exchanging heat with the flame retardant atmosphere to adjust the ambient temperature of the flame retardant atmosphere in the box; the heat exchange tube group (16) is integrated on the box wall of the closed box (1).

10. The slow-flow hedging self-protection coal gas closed sampling system according to claim 8, characterized in that: The sampling tube (2) is connected to a pressure relief tube (10) in parallel with the sampling bottle (3); a pressure relief valve (11) is installed on the pressure relief tube (10); and a sampling circulation pump (12) located between the inlet valve (4) and the pressure relief tube (10) is installed on the sampling tube (2).

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