A smoke droplet sampling device and method

Abstract

The invention discloses a smoke droplet sampling device and method, comprising a droplet sampling gun barrel, a droplet sampler mounting frame, a PLC control box and an air inlet dustproof electric valve, wherein the droplet sampler mounting frame is provided with an installation cavity whose shape matches the shape of the droplet sampler and is used to install the droplet sampler, the droplet sampler mounting frame is provided with an air inlet dustproof nozzle at the position of the droplet sampler entrance, the air inlet dustproof nozzle is communicated with the mounting cavity, and the air inlet dustproof electric valve is arranged at the air inlet dustproof nozzle; the mounting cavity is provided with a heating resistor for heating the droplet sampler and a temperature feedback probe for detecting the heating temperature of the droplet sampler at the position of the droplet sampler; one end of the droplet sampling gun barrel is connected to the droplet sampler mounting frame; the air inlet dustproof electric valve, the heating resistor and the temperature feedback probe are all connected to the PLC control box. The invention is simple to operate and has more accurate measurement results.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental protection and relates to a smoke droplet sampling device and method. Background Art

[0002] With the continuous improvement of environmental protection requirements, the accuracy of environmental protection testing must also be improved. Reducing interference is particularly important during the test process. The wet flue gas desulfurization system is prone to produce 10-60 micron "fog" during operation, which contains water, sulfuric acid, sulfate, SO2, solid particles, etc. It causes scaling and corrosion to the flue and chimney after the desulfurization island, affecting the normal operation of the equipment. Therefore, the wet flue gas desulfurization process puts forward demisting requirements for the absorption tower. The demister is the main equipment for flue gas demisting. Its demisting effect directly affects the continuous and reliable operation of various systems in the desulfurization island.

[0003] The droplet concentration is the main indicator for evaluating the effect of the demister. Under normal operation, the droplet concentration in the flue gas at the demister outlet is required to be less than 75 mg / m 3 At present, the method for testing droplet concentration in engineering mainly adopts the magnesium ion tracer method. First, the tank-shaped droplet sampler is connected to the flow meter with a silicone tube. The flue gas in the flue is passed through the droplet sampler, flow meter, and suction pump in sequence through the vacuum pump. The droplets are condensed in the droplet sampler by the above-mentioned isokinetic sampling method. The droplet sampler is rinsed with deionized water in the laboratory and the Mg in the droplets is analyzed by constant volume. 2+ concentration, and finally according to Mg 2+ The droplet concentration is calculated by correcting the concentration and solid content. The problem with this method is that it has a large error, because the magnesium ion content in the slurry and flue gas droplets is very low, and during the test process it will be affected by condensed water, impurities in the flue test hole, human errors, etc. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a smoke droplet sampling device and method, which is simple to operate and has more accurate measurement results.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A smoke droplet sampling device comprises a droplet sampling gun barrel, a droplet sampler mounting frame, a PLC control box and an air inlet dustproof electric valve. The droplet sampler mounting frame is provided with an installation cavity whose shape matches the shape of the droplet sampler and is used to install the droplet sampler. The droplet sampler mounting frame is provided with an air inlet dustproof nozzle at the position of the droplet sampler inlet, the air inlet dustproof nozzle is connected with the installation cavity, and the air inlet dustproof electric valve is arranged at the air inlet dustproof nozzle; the installation cavity is provided with a heating resistor for heating the droplet sampler and a temperature feedback probe for detecting the heating temperature of the droplet sampler at the position of the droplet sampler; one end of the droplet sampling gun barrel is connected to the droplet sampler mounting frame; the air inlet dustproof electric valve, the heating resistor and the temperature feedback probe are all connected to the PLC control box.

[0007] Preferably, the inner cavity of the droplet sampling gun barrel is connected to the mounting cavity on the droplet sampler mounting bracket, the end of the droplet sampling gun barrel is located at the outlet position of the droplet sampler, and a silicone tube for connecting to the outlet of the droplet sampler is arranged in the droplet sampling gun barrel.

[0008] Preferably, the smoke droplet sampling device of the present invention further comprises a flow meter, and the flow meter is connected to the droplet sampler outlet through the silicone tube.

[0009] Preferably, the connection lines between the temperature feedback probe, the heating resistor, the air inlet dust valve and the PLC control box all pass through the inner cavity of the droplet sampling gun barrel.

[0010] Preferably, the droplet sampling gun barrel is configured as a multi-section type, including a plurality of gun barrel short sections, and the plurality of gun barrel short sections are detachably connected in sequence.

[0011] Preferably, several sections of the barrel short sections are connected by threads.

[0012] Preferably, a silicone buffer lining is provided on one side of the heating resistor for heating the droplet sampler, and the temperature feedback probe is arranged on the inner side of the silicone buffer lining; a silicone buffer lining is provided between the outer side of the heating resistor and the droplet sampler mounting frame.

[0013] Preferably, a threaded reinforcement cover with a threaded connection is provided at one end of the droplet sampler mounting bracket, and the mounting cavity extends to the threaded reinforcement cover. The mounting cavity is provided with an avoidance groove inward from the end of the droplet sampler mounting bracket to avoid the inlet of the droplet sampler when the droplet sampler is installed.

[0014] Preferably, the heating resistor is a spiral heating resistor wire.

[0015] Preferably, the smoke droplet sampling device of the present invention further comprises a droplet sampler, and the droplet sampler is detachably mounted in the mounting cavity of the droplet sampler mounting frame.

[0016] The present invention also provides a smoke droplet sampling method, which is performed using the smoke droplet sampling device of the present invention as described above, and includes the following process:

[0017] The air inlet dust-proof electric valve is controlled to be in a normally closed state through the PLC control box, so that the air inlet dust-proof nozzle is closed;

[0018] When sampling is required:

[0019] Install the droplet sampler into the installation cavity on the droplet sampler installation frame, and connect the outlet of the droplet sampler to the gas flow meter and the air pump in series in sequence;

[0020] Test the temperature in the flue, and heat the droplet sampler to a preset temperature through the PLC control box, heating resistor and temperature feedback probe, which is the same as the temperature in the flue;

[0021] Put the droplet sampler mounting bracket into the flue through the droplet sampling gun barrel, control the air inlet dustproof electric valve to open through the PLC control box, make the air inlet dustproof nozzle conductive, aim the air inlet dustproof nozzle in the direction of the flue gas, use the vacuum pump to extract air, and when the preset suction volume is reached, stop the suction and control the air inlet dustproof electric valve to close through the PLC control box, take out the droplet sampler mounting bracket through the droplet sampling gun barrel to complete the flue gas droplet sampling.

[0022] The present invention has the following beneficial effects:

[0023] The present invention provides a droplet sampler mounting frame, and the mounting cavity inside the droplet sampler mounting frame can be used to mount the droplet sampler, and one end of the droplet sampling gun barrel is connected to the droplet sampler mounting frame, so the droplet sampler mounting frame and the droplet sampler placed inside can be sent to the sampling position for direct sampling by using the droplet sampling gun barrel; an air inlet dustproof nozzle is provided at the position of the droplet sampler entrance, an air inlet dustproof electric valve is provided at the air inlet dustproof nozzle, and the air inlet dustproof electric valve is connected to the PLC control box, and the PLC control box can be used to control the conduction of the air inlet dustproof nozzle and control the air inlet during non-sampling time. The dustproof nozzle is closed to prevent impurities from entering the droplet sampler; the heating resistor used to heat the droplet sampler and the temperature feedback probe for detecting the heating temperature of the droplet sampler are connected to the PLC control box. The heating resistor can be used to heat the droplet sampler to prevent the droplet sampler from generating condensation water with hot flue gas under low temperature conditions, which would cause the test results to be biased. At the same time, the test time can be shortened by preheating in advance. The temperature feedback probe and the PLC control box can be used to feedback and adjust the heating temperature to the preset value to achieve more accurate test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a structural schematic diagram of the droplet sampling gun device of the present invention;

[0025] Figure 2 Schematic diagram of the structure of the droplet sampler in an embodiment of the present invention.

[0026] In the figure, 1-droplet sampling gun barrel, 2-droplet sampler mounting bracket, 3-air inlet dust nozzle, 4-threaded reinforcement cover, 5-PLC control box, 6-temperature feedback probe, 7-heating resistor, 8-air inlet dust valve, 9-sealing rubber ring, 10-external threaded connector, 11-extension tube, 12-threaded connector, 13-droplet sampler, 13-1-droplet sampler inlet, 13-2-droplet sampler outlet. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0028] Reference Figure 1 and Figure 2 The smoke droplet sampling device of the present invention comprises a droplet sampling gun barrel 1, a droplet sampler mounting frame 2, a PLC control box 5 and an air inlet dustproof electric valve 8. The droplet sampler mounting frame 2 is provided with an installation cavity whose shape is adapted to the appearance of the droplet sampler 13 and is used to install the droplet sampler 13. The droplet sampler mounting frame 2 is provided with an air inlet dustproof nozzle 3 at the position of the droplet sampler inlet 13-1. The air inlet dustproof nozzle 3 is connected with the installation cavity, and the air inlet dustproof electric valve 8 is arranged at the air inlet dustproof nozzle 3; the installation cavity is provided with a heating resistor 7 for heating the droplet sampler 13 and a temperature feedback probe 6 for detecting the heating temperature of the droplet sampler 13 at the position of the droplet sampler 13; one end of the droplet sampling gun barrel 1 is connected to the droplet sampler mounting frame 2; the air inlet dustproof electric valve 8, the heating resistor 7 and the temperature feedback probe 6 are all connected to the PLC control box 5. The present invention can be designed on the basis of the original droplet sampler, because it can be preheated in advance, the preheating time for sampling is saved; because an extended connecting port is provided, it is detachable, which reduces the difficulty of handling and shipping; because the air inlet is provided with a dustproof valve, the influence of impurities during operation is reduced; because the installation frame of the droplet sampler is provided with a heating resistor, the influence of condensed water is reduced.

[0029] As a preferred embodiment of the present invention, the inner cavity of the droplet sampling gun barrel 1 is connected to the mounting cavity on the droplet sampler mounting frame 2, the end of the droplet sampling gun barrel 1 is located at the outlet position of the droplet sampler 13, and a silicone tube for connecting to the droplet sampler outlet 13-2 is provided in the droplet sampling gun barrel 1. The design of the droplet sampling gun barrel 1 with this structure can make full use of its internal space for piping, making the entire device more concise.

[0030] As a preferred embodiment of the present invention, the smoke droplet sampling device of the present invention further comprises a flow meter, and the flow meter is connected to the droplet sampler outlet 13-2 through the silicone tube.

[0031] As a preferred embodiment of the present invention, the connection lines between the temperature feedback probe 6, the heating resistor 7, the air inlet dust valve 8 and the PLC control box 5 all pass through the inner cavity of the droplet sampling gun barrel 1. This structural design makes the entire device more concise.

[0032] As a preferred embodiment of the present invention, the droplet sampling gun barrel 1 is configured as a multi-section type, including several sections of gun barrel short sections, and the several sections of gun barrel short sections are sequentially detachably connected. The droplet sampling gun barrel 1 of this structure can reduce the storage space of the entire device and is easy to carry.

[0033] As a preferred embodiment of the present invention, several sections of the gun barrel short sections are connected by threads. This structural design makes the entire droplet sampling gun barrel 1 easy to disassemble and assemble.

[0034] As a preferred embodiment of the present invention, a silicone cushion lining is provided on one side of the heating resistor 7 for heating the droplet sampler 13, and the temperature feedback probe 6 is provided on the inner side of the silicone cushion lining; a silicone cushion lining is provided between the outer side of the heating resistor 7 and the droplet sampler mounting frame 2. The silicone cushion lining can play a role of heat preservation on the one hand, and on the other hand, the silicone cushion lining on the inner side of the heating resistor 7 has a certain elasticity, so it can stably and effectively clamp the droplet sampler.

[0035] As a preferred embodiment of the present invention, a threaded reinforcing cover 4 is provided at one end of the droplet sampler mounting frame 2, and the mounting cavity extends to the threaded reinforcing cover 4. The mounting cavity is provided with a bypass groove from the end of the droplet sampler mounting frame 2 to avoid the droplet sampler inlet 13-2 when the droplet sampler 13 is installed. This structural design facilitates the disassembly and assembly of the droplet sampler, and is combined with Figure 1 and Figure 2 When disassembling the droplet sampler, first loosen and remove the threaded reinforcement cover 4, and then insert one end of the droplet sampler outlet 13-2 into the installation cavity from the right end of the installation cavity (refer to the orientation shown in the figure above). During insertion, since the lower part of the droplet sampler inlet 13-1 protrudes from the entire droplet sampler body and is perpendicular to the axis of the droplet sampler body, an avoidance groove is set inward from the end of the droplet sampler mounting frame 2, the droplet sampler inlet 13-1 can slide to the left along the avoidance groove to ensure that the entire droplet sampler is installed in place, and then the threaded reinforcement cover 4 is installed on the droplet sampler mounting frame 2 to stabilize the entire droplet sampler in the installation cavity.

[0036] As a preferred embodiment of the present invention, the heating resistor 7 is a spiral heating resistor wire. The heating resistor 7 has a simple structure and can ensure uniform heating of the entire circumference of the droplet sampler.

[0037] As a preferred embodiment of the present invention, the smoke droplet sampling device of the present invention further comprises a droplet sampler 13 , and the droplet sampler 13 is detachably mounted in the mounting cavity of the droplet sampler mounting frame 2 .

[0038] Reference Figure 1 The process of sampling using the smoke droplet sampling device of the present invention is as follows:

[0039] The air inlet dustproof electric valve 8 is controlled to be in a normally closed state by the PLC control box 5, so that the air inlet dustproof nozzle 3 is closed;

[0040] When sampling is required:

[0041] Install the droplet sampler 13 into the mounting cavity on the droplet sampler mounting frame 2, and connect the gas flow meter and the air pump in series to the outlet 13-2 of the droplet sampler;

[0042] Test the temperature in the flue, and heat the droplet sampler 13 to a preset temperature through the PLC control box 5, the heating resistor 7 and the temperature feedback probe 6. The preset temperature is the same as the temperature in the flue, so as to prevent the flue gas drawn into the inner cavity of the droplet sampler 13 from condensing;

[0043] The droplet sampler mounting frame 2 is placed into the flue through the droplet sampling gun barrel 1, and the air inlet dustproof electric valve 8 is controlled to open through the PLC control box 5 to make the air inlet dustproof nozzle 3 conductive, and the air inlet dustproof nozzle 3 is aimed at the flue gas, and the vacuum pump is used to extract air. At this time, the droplet sampler inlet 13-1 can directly absorb the smoke in the flue. When the preset suction volume is reached, the vacuum pump is controlled to stop and stop the suction, and the air inlet dustproof electric valve 8 is controlled to be closed through the PLC control box 5 to prevent impurities from entering the inner cavity of the droplet sampler. The droplet sampler mounting frame 2 is taken out through the droplet sampling gun barrel 1 to complete the flue gas droplet sampling. After that, the droplet sampler 13 can be taken out from the droplet sampler mounting frame 2 for detection.

[0044] Example

[0045] The droplet sampling device of this embodiment includes a droplet sampling gun barrel 1, a droplet sampler mounting frame 2, an air inlet dustproof nozzle 3, a threaded reinforcement cover 4, a PLC control box 5, a temperature feedback probe 6, a heating resistor 7, an air inlet dustproof valve 8, and a sealing rubber ring 9; the droplet sampling gun barrel 1 is connected to the end of the droplet sampler mounting frame 2, and the other end of the droplet sampler mounting frame 2 is connected to the threaded reinforcement cover 4 through a thread, and the side of the droplet sampler mounting frame is equipped with an air inlet dustproof nozzle 3, and the side of the air inlet dustproof nozzle 3 is equipped with an air inlet dustproof electric valve 8. The wire set at the end of the stainless steel frame 1 is connected to the PLC control box 5, and the heating resistor 7 in the droplet sampler mounting frame 2 is controlled by the PLC control box 5 to heat, and the heating temperature is controlled by the temperature feedback probe 6. At the same time, the air inlet dustproof electric valve 8 in the normally closed state is controlled to open or close the air inlet dustproof nozzle 3 through the temperature feedback and sampling end time in the PLC control box 5.

[0046] like Figure 1 As shown, the droplet sampling gun barrel 1 is set in two sections, the outlet of the air inlet dust nozzle 3 is set on the droplet sampler mounting frame 2, the outlet of the droplet sampler mounting frame 2 is set on the droplet sampling gun barrel 1, and the droplet sampler 13 is set in the mounting cavity in the droplet sampler mounting frame 2. The silicone tube connected to the flow meter is passed through the inlet ( Figure 1 The left end as shown in the figure) enters the installation cavity in the droplet sampler mounting frame 2 and is connected to the outlet of the droplet sampler 13. The droplet sampler 13 is connected to the droplet sampler mounting frame 2 through the threaded opening (i.e. Figure 1 The nozzle of the right end of the droplet sampler mounting frame 2 is inserted into the PLC control box 5, and then the direction and stability of the droplet sampler are fixed with a threaded reinforcement cover. The PLC control box 5 is provided with a display screen and control buttons. Before the test, the power of the PLC control box 5 is turned on to continuously heat the heating resistor to a preset temperature (generally the flue gas temperature), and then the droplet sampler mounting frame equipped with the droplet sampler is placed into the flue through the droplet sampling gun barrel so that the air inlet of the droplet sampler faces the direction of the flue gas, and the normally closed air inlet dustproof valve 8 is opened through the PLC control box 5. After the test, the air inlet dustproof valve 8 closes the air inlet dustproof nozzle 3 through the closing command issued by the time relay in the PLC control box, and finally the droplet sampling gun is taken out.

[0047] The process of sampling using the droplet sampling gun device described in this embodiment includes the following steps:

[0048] 1) The droplet sampler is stably mounted in the droplet sampler mounting frame through the droplet sampler mounting frame, and the droplet sampler, the gas flow meter, and the air pump are connected in series in sequence with a silicone tube;

[0049] 2) Test the flue temperature with a portable temperature tester;

[0050] 3) Set the flue temperature in the PLC control box; when the temperature rises to the flue temperature, put the droplet sampling gun into the flue and align the air inlet nozzle with the direction of the flue gas;

[0051] 4) Set the test time and start the test. The air inlet valve will open automatically.

[0052] 5) When the time is up, the air inlet valve closes automatically and the droplet sampling gun is taken out.

[0053] The droplet sampling device of the present invention is provided as a threaded extension tube, which reduces the difficulty of carrying and transporting caused by the sampling gun being too long. A dustproof device is provided at the air inlet of the droplet sampling gun, and the dustproof device is in a closed state before and after sampling, thereby preventing the entry of impurities; the operational difficulty of droplet sampling is reduced, and unnecessary problems caused by human errors and improper operation are greatly reduced; a heating resistor is also provided in the droplet sampler mounting frame, which can be heated to a set temperature in advance before testing, so as to prevent the droplet sampler from generating condensation water with hot flue gas under low temperature conditions, resulting in a larger test result, and preheating in advance also shortens the test time. The present invention eliminates the influence of condensation water and impurities on the sampling hole wall on the droplet test results. It is of great help to improve the accuracy of the demister test indicators, so that the droplet test results can more accurately and truly reflect the actual situation of the desulfurization demister.

Claims

1. A smoke droplet sampling device, characterized in that: The invention comprises a droplet sampling gun barrel (1), a droplet sampler mounting frame (2), a PLC control box (5) and an air inlet dustproof electric valve (8); the droplet sampler mounting frame (2) is provided with an installation cavity whose shape matches the shape of the droplet sampler (13) and is used to install the droplet sampler (13); the droplet sampler mounting frame (2) is provided with an air inlet dustproof nozzle (3) at the position of the droplet sampler inlet (13-1); the air inlet dustproof nozzle (3) is communicated with the installation cavity; and the air inlet dustproof nozzle (3) is connected with the installation cavity. The electric valve (8) is arranged at the dustproof nozzle (3) of the air inlet; the installation cavity is provided with a heating resistor (7) for heating the droplet sampler (13) and a temperature feedback probe (6) for detecting the heating temperature of the droplet sampler (13) at the position of the droplet sampler (13); one end of the droplet sampling gun barrel (1) is connected to the droplet sampler installation frame (2); the dustproof electric valve (8), the heating resistor (7) and the temperature feedback probe (6) of the air inlet are all connected to the PLC control box (5); The inner cavity of the droplet sampling gun barrel (1) is communicated with the mounting cavity on the droplet sampler mounting frame (2); the end of the droplet sampling gun barrel (1) is located at the outlet of the droplet sampler (13); and a silicone tube for connecting to the outlet (13-2) of the droplet sampler is arranged in the droplet sampling gun barrel (1); The droplet sampling gun barrel (1) is configured to be multi-section, including a plurality of gun barrel short sections, and the plurality of gun barrel short sections are sequentially detachably connected; A threaded reinforcing cover (4) is provided at one end of the droplet sampler mounting frame (2), the mounting cavity extends to the threaded reinforcing cover (4), and the mounting cavity is provided with an avoidance groove inwardly from the end of the droplet sampler mounting frame (2) for avoiding the droplet sampler inlet (13-2) when the droplet sampler (13) is installed; The heating resistor (7) is a spiral heating resistor wire, and the droplet sampler (13) extends into the spiral inner cavity.

2. A smoke droplet sampling device according to claim 1, characterized in that: It also includes a flow meter, which is connected to the droplet sampler outlet (13-2) through the silicone tube.

3. A smoke droplet sampling device according to claim 1, characterized in that: The connection lines between the temperature feedback probe (6), the heating resistor (7), the air inlet dust prevention valve (8) and the PLC control box (5) all pass through the inner cavity of the droplet sampling gun barrel (1).

4. A smoke droplet sampling device according to claim 1, characterized in that: A silicone cushion lining is provided on one side of the heating resistor (7) for heating the droplet sampler (13), and a temperature feedback probe (6) is arranged on the inner side of the silicone cushion lining; a silicone cushion lining is provided between the outer side of the heating resistor (7) and the droplet sampler mounting frame (2).

5. The smoke droplet sampling device according to claim 1, characterized in that: It also comprises a droplet sampler (13), which is detachably mounted in the mounting cavity of the droplet sampler mounting frame (2).

6. A method for sampling flue gas droplets, characterized in that: The smoke droplet sampling method is performed using the smoke droplet sampling device according to any one of claims 1 to 5, and includes the following process: The air inlet dust prevention electric valve (8) is controlled to be in a normally closed state through the PLC control box (5), so that the air inlet dust prevention nozzle (3) is closed; When sampling is required: The droplet sampler (13) is installed in the installation cavity on the droplet sampler installation frame (2), and the droplet sampler outlet (13-2) is connected in series with a gas flow meter and a vacuum pump in sequence; Testing the temperature in the flue, heating the droplet sampler (13) to a preset temperature through the PLC control box (5), the heating resistor (7) and the temperature feedback probe (6), the preset temperature being the same as the temperature in the flue; The droplet sampler mounting frame (2) is placed into the flue through the droplet sampling gun barrel (1), and the air inlet dustproof electric valve (8) is controlled to open through the PLC control box (5), so that the air inlet dustproof nozzle (3) is turned on, and the air inlet dustproof nozzle (3) is aimed at the flue gas direction, and the air pump is used to extract air. When the preset air extraction volume is reached, the air extraction is stopped and the air inlet dustproof electric valve (8) is controlled to close through the PLC control box (5), and the droplet sampler mounting frame (2) is taken out through the droplet sampling gun barrel (1), thereby completing the flue gas droplet sampling.

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