Radon-containing waste gas treatment system

Abstract

The utility model relates to the technical field of waste gas treatment, and particularly discloses a radon-containing waste gas treatment system. The first filter, the radon gas adsorption column sets, the gas storage tank and the second filter are sequentially arranged on the exhaust pipeline in the waste gas flowing direction, each radon gas adsorption column set comprises a plurality of adsorption columns, the adsorption columns are connected in series through a pipeline, and the multiple radon gas adsorption column sets are arranged; the radon gas adsorption column groups are connected in parallel through pipelines, a buffer tank for stabilizing waste gas flow is arranged between the radon gas adsorption column groups and the gas storage tanks, waste gas enters the gas storage tanks through the buffer tank to be decayed and cooled, and the gas storage tanks are connected in parallel through pipelines. Most of radioactive radon is removed by the radon gas adsorption column group after moisture and acid gas are removed by the first filter, system flow is stabilized by the buffer tank, then the radon is temporarily stored in the gas storage tank to be decayed and cooled, radioactive aerosol in radon-containing waste gas is removed by the second filter, and the radon-containing waste gas treatment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas treatment equipment, in particular to a radon-containing waste gas treatment system. Background Art

[0002] Radon is a decay product of the radioactive element radium. It is colorless, odorless, and tasteless. It usually exists in the air in the form of elemental radon gas. All isotopes of radon gas are radioactive. Places with relatively high indoor radon gas concentrations include underground buildings, tunnels, laboratories, etc. Once radon gas is inhaled into the human body, it will accumulate in the lungs and cause radiation damage to the respiratory system.

[0003] Most of the existing radon removal programs are aimed at indoor environments and workplaces, where the radon concentration is relatively low. 6 Bq / m 3 Below, usually ventilation dilution or adsorption material capture to reduce the radon concentration in the working and living environment, but for the high radon concentration in the industrial production environment, 10 9 Bq / m 3 The treatment efficiency of the above existing radon removal solutions for waste gas is too low. Utility Model Content

[0004] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a radon-containing waste gas treatment system to improve the treatment efficiency of radon-containing waste gas and ensure that the waste gas can be controlled and discharged in compliance with standards.

[0005] The technical solution adopted by this utility model is:

[0006] A radon-containing waste gas treatment system includes an exhaust pipe, a first filter, a radon adsorption column group, a gas storage tank and a second filter arranged in sequence along the exhaust gas flow direction on the exhaust pipe, the radon adsorption column group includes a plurality of adsorption columns, and the plurality of adsorption columns are connected in series through pipes. The radon adsorption column group is provided in multiple groups, and the multiple groups of radon adsorption column groups are connected in parallel through pipes. A buffer tank for stabilizing the waste gas flow is provided between the radon adsorption column group and the gas storage tank, and the waste gas enters the gas storage tank through the buffer tank for decay and cooling. The gas storage tank is provided in multiple groups, and the multiple gas storage tanks are connected in parallel through pipes.

[0007] After the radon-containing waste gas passes through the first filter to remove moisture and acid gas, the radon gas adsorption column group removes most of the radioactive radon, and then passes through the buffer tank to stabilize the system flow and temporarily store in the gas storage tank for decay and cooling. Multiple groups of radon gas adsorption column groups are arranged in parallel to facilitate the treatment system to continuously treat the radon-containing waste gas when the adsorbent is replaced. Multiple gas storage tanks can continuously store waste gas during the decay and cooling process of a gas storage tank. After the radon gas concentration in the gas storage tank reaches the emission standard, the second filter is used to remove the radioactive aerosols in the radon-containing waste gas, thereby improving the treatment efficiency of the radon-containing waste gas.

[0008] Optionally, a first regulating valve is provided between the first filter and the air inlet of the exhaust pipe, and a flow meter is provided between the first filter and the radon adsorption column group. The flow meter cooperates with the first regulating valve to control the flow of exhaust gas in the exhaust pipe.

[0009] Optionally, the air inlet and outlet ends of each of the radon adsorption column groups are both provided with a second regulating valve.

[0010] Optionally, a booster pump for regulating the exhaust gas pressure in the exhaust pipe is provided between the buffer tank and the radon adsorption column group.

[0011] The booster pump increases the speed at which gas enters the buffer tank, further improving the treatment efficiency of radon-containing waste gas.

[0012] Optionally, a third regulating valve is provided at both the air inlet and the air outlet of the air storage tank.

[0013] Optionally, a vacuum pump is provided between the gas storage tank and the second filter.

[0014] Optionally, a first pressure sensor is provided between the radon adsorption column group and the booster pump, and a second pressure sensor is provided on the gas storage tank.

[0015] When the first pressure sensor detects that the air pressure in the exhaust pipe is lower than the threshold, the booster pump is started to pressurize the gas in the pipe. When the second pressure sensor detects that the air pressure in the gas storage tank is greater than the threshold, the third regulating valve at the air inlet end of the gas storage tank is closed, and the third regulating valve at the air inlet end of another gas storage tank is opened, so that the treatment system can continue to treat radon-containing waste gas, thereby improving the treatment efficiency of radon-containing waste gas.

[0016] The beneficial effects of the present invention are as follows: after the radon-containing waste gas passes through the first filter to remove moisture and acid gas, most of the radioactive radon is removed by the radon gas adsorption column group, and then the waste gas is temporarily stored in the gas storage tank for decay cooling after passing through the buffer tank to stabilize the system flow. The parallel arrangement of multiple radon gas adsorption column groups facilitates the treatment system to continuously treat the radon-containing waste gas when the adsorbent is replaced. The multiple gas storage tanks can continuously store the waste gas during the decay cooling process of one gas storage tank. After the radon gas concentration in the gas storage tank reaches the emission standard, the radon ion radioactive aerosol is removed by the second filter, thereby improving the treatment efficiency of the radon-containing waste gas and ensuring that the waste gas can be controlled and discharged in compliance with the standard. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] The numbers and names in the figure correspond to each other as follows: 1. Exhaust pipe; 11. First regulating valve; 12. Flow meter; 13. Second regulating valve; 2. First filter; 31. Adsorption column; 32. First pressure sensor; 33. Flow sensor; 4. Gas storage tank; 41. Third regulating valve; 42. Second pressure sensor; 43. Radon concentration sensor; 5. Second filter; 6. Buffer tank; 61. Third pressure sensor; 7. Booster pump; 8. Vacuum pump. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1 , the utility model provides a technical solution:

[0021] A radon-containing waste gas treatment system includes an exhaust pipe 1, a first filter 2, a radon adsorption column group, a gas storage tank 4 and a second filter 5 arranged in sequence on the exhaust pipe 1 along the flow direction of the exhaust gas, a first regulating valve 11 is provided between the first filter 2 and the air inlet of the exhaust pipe 1, a flow meter 12 is provided between the first filter 2 and the radon adsorption column group, and the flow meter 12 cooperates with the first regulating valve 11 to control the flow rate of the exhaust gas in the exhaust pipe 1. In this embodiment, the first filter 2 is an activated carbon filter, the flow range in the exhaust pipe 1 is 0 to 50 L / min, the air inlet end of the exhaust pipe 1 is connected to the process chamber, and the pressure in the process chamber is -200 Pa.

[0022] The radon adsorption column group includes multiple adsorption columns 31, and the multiple adsorption columns 31 are connected in series through pipes. There are multiple groups of radon adsorption column groups, and the multiple groups of radon adsorption column groups are connected in parallel through pipes. In this embodiment, there are two groups of radon adsorption column groups, and each group of radon adsorption column groups is provided with two adsorption columns 31. The adsorbent in the adsorption column 31 is one of activated carbon, carbon fiber, and MOFs. The air inlet and air outlet ends of each radon adsorption column group are provided with a second regulating valve 13. One of the two groups of second regulating valves 13 is opened. When the adsorption column 31 needs to be replaced, one group of the second regulating valves 13 is closed while the other group of the second regulating valves 13 is opened.

[0023] A buffer tank 6 for stabilizing the flow of exhaust gas is provided between the radon gas adsorption column group and the gas storage tank 4. The exhaust gas enters the gas storage tank 4 through the buffer tank 6 and decays and cools. A booster pump 7 for adjusting the exhaust gas pressure in the exhaust pipe 1 is provided between the buffer tank 6 and the radon gas adsorption column group, which can ensure the flow of radon-containing gas when the gas pressure in the exhaust pipe 1 is low. A first pressure sensor 32 is provided between the radon gas adsorption column group and the booster pump 7 for detecting the pressure of the radon gas adsorption column group. The pressure in the radon gas adsorption column group is -400 to -600 Pa.

[0024] A third pressure sensor 61 is provided on the buffer tank 6. When the first pressure sensor 32 detects that the pressure is lower than the threshold of the radon adsorption column group or the third pressure sensor 61 detects that the pressure in the buffer tank 6 is lower than the threshold, the booster pump 7 is started to pressurize the gas in the exhaust pipe 1. When the first pressure sensor 32 detects that the pressure is higher than the threshold of the radon adsorption column group, the booster pump 7 is turned on to accelerate the exhaust gas into the buffer tank 6. When the third pressure sensor 61 detects that the pressure in the buffer tank 6 is higher than the threshold, the booster pump 7 is turned off. A flow sensor 33 is provided on the side of the first pressure sensor 32 close to the radon adsorption column group. When the flow sensor 33 detects that the gas flow in the exhaust pipe 1 is greater than the threshold, the booster pump 7 is turned off.

[0025] There are multiple gas storage tanks 4, and the multiple gas storage tanks 4 are connected in parallel through pipelines. In this embodiment, three gas storage tanks 4 are provided, and the air inlet and air outlet ends of the gas storage tanks 4 are both provided with third regulating valves 41. The pressure in the gas storage tank 4 is less than -200Pa. The second pressure sensor 42 on the gas storage tank 4, when the second pressure sensor 42 detects that the pressure in the gas storage tank 4 is greater than the threshold, closes the third regulating valve 41 at the air inlet end of the gas storage tank 4, and opens the third regulating valve 41 at the air inlet end of another gas storage tank 4 at the same time, so that the exhaust gas in one gas storage tank 4 can continue to enter the other gas storage tank 4 while decaying and cooling, thereby improving the treatment efficiency of radon-containing exhaust gas.

[0026] A vacuum pump 8 is provided between the gas storage tank 4 and the second filter 5. A radon gas concentration sensor 43 is provided on the gas storage tank 4. When the radon gas concentration sensor 43 detects that the concentration in the gas storage tank 4 reaches the emission standard value, the third regulating valve 41 at the gas outlet end of the gas storage tank 4 is opened, and the booster pump 7 is turned on to allow the gas in the gas storage tank 4 to pass through the second filter 5 and be discharged from the gas outlet end of the second filter 5. The second filter 5 removes radioactive aerosols in the radon-containing waste gas. In this embodiment, the second filter 5 is a nuclear-grade filter.

[0027] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A radon-containing waste gas treatment system, comprising an exhaust pipe (1), characterized in that: The exhaust pipe (1) is provided with a first filter (2), a radon gas adsorption column group, a gas storage tank (4), and a second filter (5) arranged in sequence along the flow direction of the exhaust gas. The radon gas adsorption column group includes a plurality of adsorption columns (31), and the plurality of adsorption columns (31) are connected in series through a pipe. The radon gas adsorption column group is provided with a plurality of groups, and the plurality of radon gas adsorption column groups are connected in parallel through pipes. A buffer tank (6) for stabilizing the flow of exhaust gas is provided between the radon gas adsorption column group and the gas storage tank (4). The exhaust gas enters the gas storage tank (4) through the buffer tank (6) to decay and cool. The gas storage tank (4) is provided with a plurality of groups, and the plurality of gas storage tanks (4) are connected in parallel through pipes.

2. A radon-containing waste gas treatment system according to claim 1, characterized in that: A first regulating valve (11) is provided between the first filter (2) and the air inlet of the exhaust pipe (1), and a flow meter (12) is provided between the first filter (2) and the radon adsorption column group. The flow meter (12) cooperates with the first regulating valve (11) to control the flow of exhaust gas in the exhaust pipe (1).

3. A radon-containing waste gas treatment system according to claim 1, characterized in that: The air inlet and outlet ends of each radon adsorption column group are both provided with a second regulating valve (13).

4. A radon-containing waste gas treatment system according to claim 1, characterized in that: A booster pump (7) for regulating the waste gas pressure in the exhaust pipe (1) is provided between the buffer tank (6) and the radon adsorption column group.

5. A radon-containing waste gas treatment system according to claim 1, characterized in that: The air inlet end and the air outlet end of the air storage tank (4) are both provided with a third regulating valve (41).

6. A radon-containing waste gas treatment system according to claim 1, characterized in that: A vacuum pump (8) is provided between the gas storage tank (4) and the second filter (5).

7. A radon-containing waste gas treatment system according to claim 1, characterized in that: A first pressure sensor (32) is provided between the radon adsorption column group and the booster pump (7), and a second pressure sensor (42) is provided on the gas storage tank (4).

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