CN212516598U

CN212516598U - Process treatment system for purifying waste gas of nuclear facility

Info

Publication number: CN212516598U
Application number: CN202021402296.7U
Authority: CN
Inventors: 张义科; 李福春; 谢小明; 彭军; 余峰; 张克强; 唐坤林; 黄仁忠; 赵占奎
Original assignee: Nuclear Power Institute of China
Current assignee: Nuclear Power Institute of China
Priority date: 2020-07-16
Filing date: 2020-07-16
Publication date: 2021-02-09
Anticipated expiration: 2030-07-16

Abstract

The utility model discloses a technology processing system for purifying nuclear facilities waste gas, including the buffer tank, dissolve gas pitcher and cyclone, the entry and the waste gas pressurization system of buffer tank link to each other, the export of buffer tank links to each other with the air inlet that dissolves the gas pitcher, it is equipped with the inlet to dissolve the gas pitcher top, the waste liquid export that dissolves the gas pitcher bottom and links to each other with cyclone inlet, the liquid inlet department of cyclone's inside cyclone installs and dissolves gas release head, cyclone top even has water charging system and medicine system, cyclone tank bottom leakage fluid dram links to each other with circulation force (forcing) pump entrance point, the exit end of circulation force (forcing) pump links to each other with the inlet that dissolves the gas pitcher. The utility model discloses a waste gas treatment system adopts compound form, has combined both advantages of air supporting technique and whirl technique, has advantages such as structural style is simple, convenient operation, handling capacity is big, continuous operation, treatment effeciency height, displacement not shut down.

Description

Process treatment system for purifying waste gas of nuclear facility

Technical Field

The utility model relates to a waste gas purification field, concretely relates to a technology processing system for purifying nuclear facility waste gas.

Background

The working conditions of nuclear facility maintenance, decommissioning and dismantling, radioactive waste treatment, nuclear material performance change and the like can generate a large amount of gas containing aerosol. The aerosol has small particle size, can suspend in the air for a long time, and radioactive nuclides are deposited on the surface of aerosol colloid to cause larger-scale pollution, so that once leakage occurs, the environment of a working area and the personal safety of personnel are threatened greatly.

At present, the purification mode of the waste gas of the nuclear facility is mainly filtration treatment, including dry filtration and wet filtration. The existing mature dry filter has a sand pile filter and a metal fiber filter, wherein the metal fiber filter combines the advantages of differential pressure filtration and adsorption filtration, and has the characteristics of high purification rate, high purification speed, low energy consumption and the like, but the humidity of the gas to be filtered is too high, the service life of the filter element is bound to be reduced, the filter element needs to be manually and periodically maintained and replaced, and the personal safety of personnel entering a purification area is greatly threatened.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a technology processing system for purifying nuclear facility waste gas to solve the short and low problem of wet-type venturi separator purification efficiency of present traditional dry-type differential pressure separation purifier filter core change cycle, have that structural style is simple, convenient operation, handling capacity are big, continuous operation, treatment effeciency are high, advantage such as displacement do not shut down.

The utility model discloses a following technical scheme realizes:

the utility model provides a technology processing system for purifying nuclear facility waste gas, including the buffer tank, dissolve gas pitcher and cyclone tank, the entry and the waste gas pressurization system of buffer tank link to each other, the export of buffer tank links to each other with the air inlet that dissolves the gas pitcher, it is equipped with the inlet to dissolve the gas pitcher top, it links to each other with cyclone tank inlet to dissolve the waste liquid export that the gas pitcher bottom was equipped with, the inlet department of cyclone tank's inside cyclone tank installs and dissolves gas release head, cyclone tank top even has water charging system and medicine system, cyclone tank bottom leakage fluid dram links to each other with circulation force (forcing) pump entrance point, the exit end of circulation force (forcing) pump links to each other with.

The waste gas treatment system of the utility model adopts a composite form, combines the advantages of the air floatation technology and the rotational flow technology, enhances the gas dissolution process by pressurizing the dissolved gas floatation process, realizes the separation from impurities in the gas, and can realize the fine separation of the polluted gas; the cyclone separation can strengthen the 'gas washing separation process' of gas, and the pressurization gas dissolving water separates out the microbubble in the cyclone separation jar, can strengthen the 'gas washing' process, can promote gas-liquid separation efficiency through centrifugal cyclone mode simultaneously for release bubble gathers and release speed, accomplishes in the waste gas impurity "the process of concentrating in water", and purification treatment is big, and the treatment effect is good, and degree of automation is high.

The entry of buffer tank is equipped with buffer tank inlet valve, and the export of buffer tank is equipped with the buffer tank outlet valve, and the air inlet of dissolving the gas pitcher is equipped with dissolves the gas pitcher admission valve, and the inlet of dissolving the gas pitcher is equipped with dissolves gas pitcher feed liquor valve, and circulation force (forcing) pump entrance point is equipped with the inlet valve before the pump.

The top of the cyclone separation tank is provided with an exhaust port, the exhaust port divides the exhaust gas to form a first exhaust passage and a second exhaust passage, the first exhaust passage is connected with the waste gas pressurization system, the second exhaust passage is connected with the exhaust system, the first exhaust passage is provided with a first exhaust valve, and the second exhaust passage is provided with a second exhaust valve.

The outlet end of the circulating booster pump is divided into a first passage and a second passage, the first passage is connected into a liquid inlet of the dissolved air tank, the first passage is connected in a threaded mode, the second passage is connected to the top of the cyclone separation tank, the second passage is welded, and a bypass valve is arranged on the second passage.

Dissolve gas pitcher waste liquid export reposition of redundant personnel and form first drainage way and second drainage way, first drainage way and cyclone separation jar, second drainage way links to each other with the liquid waste system of arranging, be equipped with on the second drainage way and dissolve gas pitcher liquid waste outlet valve, cyclone separation jar bottom leakage fluid dram reposition of redundant personnel forms first drainage passageway and second drainage passageway, first drainage passageway links to each other with circulation force (forcing) pump entrance point, second drainage passageway also links to each other with the liquid waste system of arranging, be equipped with on the second drainage passageway and connect liquid waste system outlet valve.

An inlet valve for the water charging system is arranged between the water charging system and the cyclone separation tank, and an inlet valve for the chemical feeding system is arranged between the chemical feeding system and the cyclone separation tank.

Install the buffer tank manometer on the buffer tank, dissolve and install on the gas pitcher and dissolve the gas pitcher manometer.

A pressure relief pipeline is connected between the buffer tank and the dissolved air tank, a dissolved air tank pressure relief valve main valve is installed on the pressure relief pipeline, and an overhaul pressure relief valve and an automatic pressure relief valve which are installed in a parallel mode are further arranged on the pressure relief pipeline.

A gas flowmeter is arranged between the outlet of the buffer tank and the gas inlet of the dissolved gas tank, and a liquid flowmeter is arranged at the outlet end of the circulating pressure pump.

The system also comprises a remote control terminal and a display page, and each inlet/outlet valve and each detection instrument are connected with the remote control terminal and the display page.

The utility model discloses exhaust-gas treatment system's working process as follows: firstly, the exhaust gas of the nuclear facility containing the aerosol enters a buffer tank after being pressurized by an exhaust gas pressurization system, and the buffer tank can keep a certain volume pressure, so that the influence of air pressure fluctuation on the air dissolving efficiency is avoided; then the pressurized waste gas enters the dissolved gas tank from the lower part through an outlet valve of the buffer tank, a gas flow meter and an air inlet valve of the dissolved gas tank, then fluid absorption liquid flowing out from the outlet end of the circulating pressure pump enters the dissolved gas tank from the upper part of the dissolved gas tank to flow downwards and forms reverse convection with the waste gas flowing downwards and upwards, water dissolved in the absorption liquid by air forms saturated dissolved gas water under the pressurized condition, impurities such as aerosol in the waste gas react with a solvent in the absorption liquid to form soluble salts or concentrate in the absorption liquid, and the sorting and separating process of the multiphase flow heterogeneous medium is finished (in order to increase the contact surface of a liquid film, a Raschig ring can be used as a filler in the dissolved gas tank); the formed saturated dissolved gas water flows out from the bottom of the dissolved gas tank and enters the cyclone separation tank tangentially; the saturated gas-dissolving water is released by the gas-dissolving releasing head to form a supersaturated state, so that a large number of micro bubbles are separated out, the micro bubbles are gathered towards the center under the centrifugal action, the coalescence effect is generated, the large bubbles float and are crushed on the surface layer of the absorption liquid, the 'gas washing process' is completed, meanwhile, part of the carried insoluble impurities are adsorbed on the surfaces of the micro bubbles to form floccules, the heterogeneous density difference is increased, the centrifugal action accelerates the insoluble impurities to float on the surface layer of the absorption liquid, and the heterogeneous separation process is completed; the cleaned gas enters an exhaust system through a guide pipe and is exhausted to the environment or enters a waste gas pressurizing system again for carrying out a secondary gas washing process, the absorption liquid after gas washing enters a pump front inlet valve along the conical section of the bottom of the cyclone separation tank and is lifted to a dissolved gas tank through a circulating lift pump to carry out a gas-liquid convection dissolving process, the cyclic utilization of the absorption liquid is realized, or the waste liquid is treated in a centralized way through a waste liquid exhaust system; water supplement and drug addition are respectively and quantitatively added through a water supplement system and a drug delivery system according to requirements, and meanwhile, part of absorption liquid waste liquid is discharged from the bottom of the cyclone separation tank through an outlet valve of the liquid receiving and discharging system, so that the non-stop replacement operation of the absorption liquid can be realized; each inlet and outlet valve and instrumentation all connect remote control terminal and show the page and realize remote control and control, can be in order to adjust buffer tank pressure and dissolved gas jar air input, can adjust gas emission, medicine interpolation and waste residue waste liquid discharge, avoid personnel to receive radiation injury because of entering radioactive region reloading.

The utility model discloses following beneficial effect has:

1. the utility model relates to a process treatment system for purifying nuclear facilities waste gas has advantages such as structural style is simple, convenient operation, handling capacity are big, continuous operation, treatment effeciency height, displacement not shut down.

2. The utility model relates to a technology processing system for purifying nuclear facilities waste gas adopts compound form, has combined both advantages of air supporting technique and whirl technique, and purification treatment volume is big, and the treatment effect is good, and degree of automation is high.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic view of the processing system of the present invention;

FIG. 2 is a top partial cross-sectional view of the cyclone separation tank;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

fig. 4 is a left side view of fig. 2.

Reference numbers and corresponding part names: 1-a buffer tank, 2-a buffer tank pressure gauge, 3-a dissolved gas tank pressure relief valve main valve, 4-a maintenance pressure relief valve, 5-an automatic pressure relief valve, 6-a first exhaust valve, 7-a dissolved gas tank, 8-a dissolved gas tank pressure gauge, 9-a dissolved gas tank inlet valve, 10-a liquid flowmeter, 11-a bypass valve, 12-a second exhaust valve, 13-a water charging system inlet valve, 14-a medicine charging system inlet valve, 15-a cyclone separation tank, 16-a dissolved gas release head, 17-a liquid discharging system outlet valve, 18-a pre-pump inlet valve, 19-a dissolved gas tank waste liquid discharging outlet valve, 20-a circulating pressure pump, 21-a remote control terminal and a display page, 22-a dissolved gas tank inlet valve, 23-a gas flowmeter and 24-a buffer tank outlet valve, 25-buffer tank inlet valve.

Detailed Description

To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.

Example 1:

as shown in fig. 1, fig. 2 and fig. 3, a process treatment system for purifying waste gas of nuclear facilities, including buffer tank 1, dissolve gas pitcher 7 and cyclone tank 15, the entry of buffer tank 1 links to each other with waste gas pressurization system, the export of buffer tank 1 links to each other with the air inlet of dissolving gas pitcher 7, it is equipped with the inlet to dissolve gas pitcher 7 top, dissolve the waste liquid export that the gas pitcher 7 bottom was equipped with and link to each other with cyclone tank 15 inlet, the liquid inlet department of cyclone tank 15's inside cyclone tank 15 installs and dissolves gas release head 16, cyclone tank 15 top even has water charging system and medicine system, cyclone tank 15 bottom fluid-discharge outlet links to each other with circulation force (forcing) pump 20 entrance point, the exit end of circulation force (forcing) pump 20 links to each other with the inlet of.

The waste gas treatment system of the utility model combines the advantages of the air floatation technology and the rotational flow technology, adopts a compound form, and the pressurized dissolved air floatation process strengthens the gas dissolution process, realizes the separation from impurities in the gas, and can realize the fine separation of the polluted gas; the cyclone separation can strengthen the gas 'washing gas separation process', the pressurizing gas dissolving water can separate out micro bubbles in the cyclone separation tank to strengthen the 'washing gas' process, the gas-liquid separation efficiency can be improved in a centrifugal cyclone mode, the released bubbles are quickened to be gathered and released, the process that impurities in waste gas are concentrated in water is completed, the purification treatment capacity is large, the treatment effect is good, and the automation degree is high.

Preferably, the inlet of the buffer tank 1 is provided with a buffer tank inlet valve 25, the outlet of the buffer tank 1 is provided with a buffer tank outlet valve 24, the air inlet of the dissolved air tank 7 is provided with a dissolved air tank inlet valve 22, the liquid inlet of the dissolved air tank 7 is provided with a dissolved air tank inlet valve 9, and the inlet end of the circulating pressure pump 20 is provided with a pump front inlet valve 18.

Preferably, the top of the cyclone separation tank 15 is provided with an exhaust port, the exhaust port divides the gas into a first exhaust passage and a second exhaust passage, the first exhaust passage is connected with the waste gas pressurization system, the second exhaust passage is connected with the exhaust system, the first exhaust passage is provided with a first exhaust valve 6, and the second exhaust passage is provided with a second exhaust valve 12.

Preferably, the outlet end of the circulating booster pump 20 is divided into a first passage and a second passage, the first passage is connected to the liquid inlet of the dissolved air tank 7, the second passage is connected to the top of the cyclone separation tank 15, and the second passage is provided with a bypass valve 11.

Preferably, dissolve 7 waste liquid outlet shunts of gas pitcher and form first drainage way and second drainage way, first drainage way and cyclone 15, second drainage way links to each other with the liquid waste system of arranging, be equipped with on the second drainage way and dissolve gas pitcher liquid

waste outlet valve

19, 15 bottom leakage fluid dram shunts of cyclone 15 forms first drainage passageway and second drainage passageway, first drainage passageway links to each other with circulation force (forcing) pump 20 entrance point, second drainage passageway also links to each other with the liquid waste system of arranging, be equipped with on the second drainage passageway and connect liquid waste system outlet valve 17.

Preferably, a water receiving and supplementing system inlet valve 13 is arranged between the water supplementing system and the cyclone separation tank 15, and a drug receiving and adding system inlet valve 14 is arranged between the drug adding system and the cyclone separation tank 15.

Preferably, a buffer tank pressure gauge 2 is installed on the buffer tank 1, and a dissolved gas tank pressure gauge 8 is installed on the dissolved gas tank 7.

Preferably, a pressure relief pipeline is connected between the buffer tank 1 and the dissolved air tank 7, a dissolved air tank pressure relief valve main valve 3 is installed on the pressure relief pipeline, and an overhaul pressure relief valve 4 and an automatic pressure relief valve 5 which are installed in a parallel mode are further arranged on the pressure relief pipeline.

Preferably, a gas flow meter 23 is arranged between the outlet of the buffer tank 1 and the gas inlet of the dissolved gas tank 7, and a liquid flow meter 10 is arranged at the outlet end of the circulating pressure pump 20.

Preferably, the system further comprises a remote control terminal and a display page 21, and each inlet/outlet valve and each detection instrument are connected with the remote control terminal and the display page 21.

The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The utility model provides a technology processing system for purifying nuclear facilities waste gas, a serial communication port, including buffer tank (1), dissolve gas pitcher (7) and cyclone (15), the entry and the waste gas pressurization system of buffer tank (1) link to each other, the export of buffer tank (1) links to each other with the air inlet that dissolves gas pitcher (7), it is equipped with the inlet to dissolve gas pitcher (7) top, the waste liquid export that dissolves gas pitcher (7) bottom and be equipped with links to each other with cyclone (15) inlet, the inlet department of the inside cyclone (15) of cyclone (15) installs and dissolves gas release head (16), cyclone (15) top even has water charging system and medicine system, cyclone (15) bottom fluid discharge outlet links to each other with circulation force (forcing) pump (20) inlet point, the exit end of circulation force (forcing) pump (20) links to each other with the inlet that dissolves gas pitcher (7).

2. A process treatment system for purifying exhaust gases of nuclear plants according to claim 1, characterized in that the inlet of the buffer tank (1) is provided with a buffer tank inlet valve (25), the outlet of the buffer tank (1) is provided with a buffer tank outlet valve (24), the air inlet of the dissolved air tank (7) is provided with a dissolved air tank inlet valve (22), the liquid inlet of the dissolved air tank (7) is provided with a dissolved air tank inlet valve (9), and the inlet of the circulating booster pump (20) is provided with a pre-pump inlet valve (18).

3. A process treatment system for the purification of exhaust gases from nuclear plants according to claim 1, characterized in that the cyclone separator tank (15) is provided at its top with an exhaust port which is divided into a first exhaust duct and a second exhaust duct, the first exhaust duct being connected to the exhaust gas pressurization system and the second exhaust duct being connected to the exhaust system, the first exhaust duct being provided with a first exhaust valve (6) and the second exhaust duct being provided with a second exhaust valve (12).

4. A process treatment system for purifying exhaust gases of nuclear plants according to claim 1, characterized in that the outlet end of the circulation booster pump (20) is branched to form a first passage and a second passage, the first passage is connected to the liquid inlet of the dissolved air tank (7), the second passage is connected to the top of the cyclone separation tank (15), and the second passage is provided with a bypass valve (11).

5. A process treatment system for the purification of exhaust gases from nuclear plants according to claim 1, characterized in that the waste liquid outlet of the dissolved air tank (7) is branched to form a first liquid discharge channel and a second liquid discharge channel, the first liquid discharge channel is connected to the cyclone (15) and the second liquid discharge channel is connected to the waste liquid discharge system, the second liquid discharge channel is provided with a dissolved air tank waste liquid outlet valve (19), the liquid discharge outlet at the bottom of the cyclone (15) is branched to form a first liquid discharge channel and a second liquid discharge channel, the first liquid discharge channel is connected to the inlet of the circulating pressure pump (20), the second liquid discharge channel is also connected to the waste liquid discharge system, and the second liquid discharge channel is provided with a liquid discharge system outlet valve (17).

6. The process treatment system for purifying waste gas of nuclear facilities according to claim 1, wherein a water inlet valve (13) for receiving water is provided between the water charging system and the cyclone tank (15), and a chemical inlet valve (14) for receiving chemical is provided between the chemical feeding system and the cyclone tank (15).

7. A process treatment system for the purification of exhaust gases of nuclear plants according to claim 2, characterized in that the buffer tank (1) is equipped with a buffer tank pressure gauge (2) and the dissolved gas tank (7) is equipped with a dissolved gas tank pressure gauge (8).

8. The process treatment system for purifying the exhaust gas of the nuclear facility according to claim 7, wherein a pressure relief pipeline is connected between the buffer tank (1) and the dissolved gas tank (7), a dissolved gas tank relief valve main valve (3) is installed on the pressure relief pipeline, and a maintenance relief valve (4) and an automatic relief valve (5) which are installed in parallel are further arranged on the pressure relief pipeline.

9. A process treatment system for the purification of exhaust gases of nuclear plants according to claim 8, characterized in that a gas flow meter (23) is provided between the outlet of the buffer tank (1) and the inlet of the dissolved gas tank (7), and a liquid flow meter (10) is provided at the outlet of the recycle pressure pump (20).

10. The system of claim 9, further comprising a remote control terminal and a display screen (21), wherein each of the inlet/outlet valves and the instrumentation are connected to the remote control terminal and the display screen (21).