CN211538956U - Device for controlling oxygen content of tail gas of thermal desorption system of organic contaminated soil - Google Patents
Device for controlling oxygen content of tail gas of thermal desorption system of organic contaminated soil Download PDFInfo
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- CN211538956U CN211538956U CN201921708806.0U CN201921708806U CN211538956U CN 211538956 U CN211538956 U CN 211538956U CN 201921708806 U CN201921708806 U CN 201921708806U CN 211538956 U CN211538956 U CN 211538956U
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- thermal desorption
- oxygen content
- air
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- 238000003795 desorption Methods 0.000 title claims abstract description 75
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000001301 oxygen Substances 0.000 title claims abstract description 70
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 70
- 239000007789 gas Substances 0.000 title claims abstract description 30
- 239000002689 soil Substances 0.000 title claims abstract description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical group N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 176
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 80
- 238000004887 air purification Methods 0.000 claims abstract description 17
- 238000002360 preparation method Methods 0.000 claims abstract description 15
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 9
- 230000001502 supplementing effect Effects 0.000 claims abstract description 7
- 238000007781 pre-processing Methods 0.000 claims abstract description 3
- 238000001179 sorption measurement Methods 0.000 claims description 69
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 55
- 229910052799 carbon Inorganic materials 0.000 claims description 39
- 239000002808 molecular sieve Substances 0.000 claims description 37
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 37
- 230000001276 controlling effect Effects 0.000 claims description 17
- 238000003860 storage Methods 0.000 claims description 17
- 230000009471 action Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 230000003584 silencer Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract description 4
- 239000000428 dust Substances 0.000 abstract 1
- 239000003921 oil Substances 0.000 abstract 1
- 239000003570 air Substances 0.000 description 75
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 30
- 239000003345 natural gas Substances 0.000 description 15
- 239000010802 sludge Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 239000012298 atmosphere Substances 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 230000009469 supplementation Effects 0.000 description 3
- 230000001960 triggered effect Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 150000003071 polychlorinated biphenyls Chemical class 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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- Separation Of Gases By Adsorption (AREA)
Abstract
The utility model discloses a device for controlling organic contaminated soil thermal desorption system tail gas oxygen content, the device include according to gaseous trend and consecutive air purification preprocessing unit, preparation nitrogen gas unit and online supplementary nitrogen gas the control unit, provide nitrogen protection for organic contaminated soil thermal desorption system through online supplementary nitrogen gas the control unit. The utility model makes the oil, water and dust content in the air meet the requirement of the raw material of the nitrogen making machine through the air purification pretreatment unit; obtaining nitrogen with the purity of 98-99.99% through a nitrogen preparation unit; the nitrogen is automatically supplemented into the thermal desorption system through the online nitrogen supplementing unit. The utility model discloses can be when oxygen content reaches or surpasses the default in the thermal desorption system, the automatic supplementary nitrogen gas that adds ensures to maintain the anaerobic state in the thermal desorption system, realizes the safety protection function to the thermal desorption system.
Description
Technical Field
The utility model relates to a pollute soil processing technology field, concretely relates to a device that is used for organic contaminated soil thermal desorption system tail gas oxygen content.
Background
At present, a large number of organic polluted sites such as POPs (persistent organic pollutants), PCBs (polychlorinated biphenyls) and petroleum hydrocarbons exist in China, thermal desorption treatment is a technology widely used for harmless treatment of the polluted soil, when the organic polluted sites are repaired by adopting a thermal desorption technology, a large number of flammable and combustible tail gas can be generated in thermal desorption equipment, the traditional thermal desorption equipment is internally heated, and the tail gas is directly contacted with open fire, so that the oxygen content in the thermal desorption equipment must be strictly controlled to enable fuel to be fully combusted, the thermal desorption equipment is ensured to heat the soil in an anaerobic state, and otherwise, explosion danger can be brought.
At present, the oxygen content in thermal desorption equipment is generally interlocked with a blower, the oxygen content of a system is controlled mainly by the frequency change of the blower, but the oxygen content can be changed by adjusting other parameters, and when the oxygen content of the system is changed greatly, if no other atmosphere protection systems exist, the explosion danger still exists.
However, no report related to an atmosphere protection device capable of automatically supplementing nitrogen according to the change of oxygen content in thermal desorption equipment is found at present.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a device for organic contaminated soil thermal desorption system tail gas oxygen content is provided, the device can supply nitrogen gas in the automatic heat desorption system according to oxygen content's change, for thermal desorption system provides atmosphere protection, guarantees that thermal desorption system heats soil under anaerobic state, reduces the explosion risk.
The utility model discloses solve above-mentioned technical problem with following technical scheme:
the utility model is used for controlling device of organic contaminated soil thermal desorption system tail gas oxygen content is including the air purification preprocessing unit that meets in proper order, preparation nitrogen gas unit and online supplementary nitrogen gas unit, and the nitrogen gas output pipeline of preparation nitrogen gas unit is connected with organic contaminated soil thermal desorption system, provides nitrogen protection for organic contaminated soil thermal desorption system.
The air purification pretreatment unit consists of an air compressor, an air buffer tank, an air purification unit and an air storage tank which are sequentially connected and arranged according to the gas direction, wherein the air purification unit consists of a C-level filter, a cold dryer, an A-level filter and an active carbon adsorption tower which are sequentially connected and arranged according to the gas direction; the inlet end of the C-stage filter is connected with an air buffer tank, and the outlet end of the activated carbon adsorption tower is connected with an air storage tank.
The nitrogen preparation unit comprises two carbon molecular sieve adsorption towers connected in parallel, the front end converging pipelines of the two carbon molecular sieve adsorption towers are connected with an air storage tank, the rear end converging pipelines are connected with a nitrogen buffer tank through an H-level filter, the two carbon molecular sieve adsorption towers are controlled by a programmable controller to alternately operate to realize alternate adsorption and desorption, and then nitrogen in the air is continuously separated out, so that the nitrogen is continuously conveyed to the nitrogen buffer tank.
The bottom of the two carbon molecular sieve adsorption towers is provided with an exhaust pipeline, and the exhaust pipeline is provided with a silencer.
The online nitrogen supplementing unit comprises an interlocking switch device and an oxygen content analyzer, the oxygen content analyzer is installed on a tail gas pipeline of the organic contaminated soil thermal desorption system, the interlocking switch device is electrically connected with the oxygen content analyzer, the PLC control system controls the on-off action of the interlocking switch device according to the detection result of the oxygen content analyzer, and the online nitrogen supplementing to the organic contaminated soil thermal desorption system is realized.
And a one-way throttle valve is arranged on the inlet end pipeline of the nitrogen buffer tank, and a plunger valve, a pressure regulating valve, a flow meter and a nitrogen analyzer which are sequentially connected from front to back are arranged on the outlet end pipeline.
The air compressor is a screw air compressor, and two air compressors are arranged and can be independently controlled.
Compared with the prior art, the utility model has the advantages of it is following:
(1) the utility model discloses an establish the interlock with the oxygen content analysis appearance of installing in thermal desorption processing system, the automatic nitrogen gas that supplyes when the oxygen content fluctuation is great in thermal desorption processing system, for it provides atmosphere protection, can improve thermal desorption processing system's safety protection level to a certain extent, reduce the explosion risk.
(2) The utility model discloses use two sets of parallelly connected adsorption towers to make two sets of adsorption towers automatic in turn pressurize through programmable controller control electromagnetic pneumatic valve and adsorb and decompress regeneration, accomplish the nitrogen-oxygen separation, realize constantly obtaining the nitrogen gas of required different purities in succession.
Drawings
Fig. 1 is a schematic structural diagram of the device for controlling the oxygen content of the tail gas of the thermal desorption system for organic contaminated soil.
In the figure: the system comprises an air compressor 1, an air buffer tank 2, a C-grade filter 301, a freeze dryer 302, an A-grade filter 303, an activated carbon adsorption tower 304, an air storage tank 4, a carbon molecular sieve adsorption tower 5-A, a carbon molecular sieve adsorption tower 5-B, a programmable controller 501, a silencer 502, an H-grade filter 6, a nitrogen buffer tank 7, a flowmeter 701, a nitrogen analyzer 702, an interlocking switch device 8 and an oxygen content analyzer 9.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings.
As shown in figure 1, the device of the utility model comprises an air purification pretreatment unit, a nitrogen preparation unit and an on-line nitrogen supplement unit which are connected in sequence.
The air purification pretreatment unit consists of an air compressor 1, an air buffer tank 2, an air purification unit and an air storage tank 4 which are sequentially connected and arranged according to the gas direction, wherein the air purification unit consists of a C-stage filter 301, a cold dryer 302 (namely a cooling dryer), an A-stage filter 303 and an active carbon adsorption tower 304 which are sequentially connected and arranged according to the gas direction; the inlet end of the C-stage filter 301 is connected with the air buffer tank 2, and the outlet end of the activated carbon adsorption tower 304 is connected with the air storage tank 4.
The air compressor 1 can adopt a screw air compressor and is provided with two groups, the two groups of air compressors 1 are connected in parallel, the output ends of the first group of air compressors and the second group of air compressors are respectively connected with a ball valve V1 and a ball valve V2 which can be independently controlled, and the two ball valves V are used for connecting the output ends of the first group of air compressors and the second group of air compressors1、V2The amount of air entering the air buffer tank 2 is controlled.
The C-stage filter 301, the cold dryer 302 and the A-stage filter 303 can also be provided with a plurality of groups, the C-stage filter 301, the cold dryer 302 and the A-stage filter 303 in each group are connected in series, and are respectively connected with the air buffer tank 2 through the C-stage filter 301, and the A-stage filter 303 is connected with the activated carbon adsorption tower 304. According to the air quantity required by the nitrogen preparation unit through pressure swing adsorption, two groups of equipment arranged in parallel can be started at the same time, and can be used for one equipment.
The nitrogen preparation unit comprises a carbon molecular sieve adsorption tower 5-A and a carbon molecular sieve adsorption tower 5-B, the carbon molecular sieve adsorption tower 5-A and the carbon molecular sieve adsorption tower 5-B are connected in parallel, a front converging pipeline of the two carbon molecular sieve adsorption towers is connected with an air storage tank 4, a rear converging pipeline is connected with a nitrogen buffer tank 7 through an H-level filter 6, the two carbon molecular sieve adsorption towers are controlled by a programmable controller 501 to alternately operate to realize alternate adsorption and desorption, and then nitrogen in the air is continuously separated out, so that nitrogen is continuously conveyed to the nitrogen buffer tank 7, and the nitrogen buffer tank 7 provides nitrogen atmosphere protection for the thermal desorption treatment system.
A plunger valve V3 and an electromagnetic pneumatic valve Y1 are arranged on a converging pipeline at the front ends of the carbon molecular sieve adsorption tower 5-A and the carbon molecular sieve adsorption tower 5-B, an electromagnetic pneumatic valve Y2 and an electromagnetic pneumatic valve Y3 which are independently controlled are respectively arranged on an inlet pipeline of the carbon molecular sieve adsorption tower 5-A and an inlet pipeline of the carbon molecular sieve adsorption tower 5-B, a communicated pipeline is connected between the two inlet pipelines, and the electromagnetic pneumatic valve Y4 and the electromagnetic pneumatic valve Y5 are arranged on the pipeline; an outlet pipeline of the carbon molecular sieve adsorption tower 5-A and an outlet pipeline of the carbon molecular sieve adsorption tower 5-B are respectively provided with an independently controlled electromagnetic pneumatic valve Y6 and an electromagnetic pneumatic valve Y7, a communicated pipeline is connected between the two outlet pipelines, and a needle valve V4 is arranged on the pipeline; an electromagnetic pneumatic valve Y8 is arranged on a converging pipeline at the rear ends of the two carbon molecular sieve adsorption towers; the inlet end of the nitrogen buffer tank 7 is provided with a one-way throttle valve V5, and the outlet end is connected with a nitrogen output pipeline.
Two carbon molecular sieve adsorption towers rely on programmable controller 501 to control the action order realization of above-mentioned electromagnetic pneumatic valve in turn adsorb, the desorption, and then constantly carry nitrogen gas to the nitrogen buffer tank in succession.
The specific control process is as follows:
clean compressed air sent by the air purification pretreatment unit manually adjusts the flow rate of inlet air through a plunger valve V3, then enters a tower body from the lower part of a carbon molecular sieve adsorption tower 5-A through electromagnetic pneumatic valves Y1 and Y2, is adsorbed by a carbon molecular sieve bed layer in the adsorption tower and is gradually pushed upwards, in the process, oxygen molecules in the air are adsorbed in micropores of the carbon molecular sieve, a large amount of nitrogen and a small amount of oxygen flow out from the upper part of the tower, and then enters a nitrogen buffer tank 7 through the electromagnetic pneumatic valves Y6, Y8 and a one-way throttle valve V4, and the process is the adsorption nitrogen making of the 5-A tower. Meanwhile, the oxygen molecules adsorbed in the carbon molecular sieve adsorption tower 5-B are exhausted through the electromagnetic pneumatic valve Y5 and the silencer 10, namely the 5-B tower is desorbed and deoxidized. Thereby realizing continuous nitrogen supply when the two towers work alternately. When the 5-A tower works for a period of time and the adsorption of the carbon molecular sieve in the adsorption tower to oxygen is close to saturation, the adsorption tower stops adsorbing in time. At the moment, the electromagnetic pneumatic valves Y1, Y4, Y5 and Y8 are all in a closed state, the electromagnetic pneumatic valves Y2, Y3, Y6 and Y7 are simultaneously in an open state, pressure equalization is carried out on the two adsorption towers of the 5-A tower and the 5-B tower, the pressure equalization has the effect of transferring gas (the gas has less oxygen content) in the external gas phase of the 5-A tower to the 5-B tower for reuse, the pressure equalization time is generally 1-2 seconds, and the adsorption state of the 5-B tower and the desorption state of the 5-A tower are switched after the pressure equalization. At this time, the compressed air enters the lower part of the 5-B adsorption tower through the electromagnetic pneumatic valves Y1 and Y3. Adsorbing by a carbon molecular sieve bed layer in a 5-B adsorption tower. The separated nitrogen enters a nitrogen storage tank 7 through electromagnetic pneumatic valves Y7, Y8 and V3, namely the 5-B adsorption tower is used for adsorbing and producing nitrogen. In order to completely release the residual oxygen in the adsorption tower after desorption from the adsorption tower into the air, namely clean, a part of nitrogen is shunted from the top of the adsorption tower in the adsorption work, the normal flow is 8.5% -10% of the nitrogen production amount, and the nitrogen enters the adsorption tower for desorption to be blown and swept after being controlled by a needle valve V4, so that the diffusion speed of the oxygen to the outside of the adsorption tower is accelerated until the next cycle. Thereby realizing the alternate adsorption and desorption of the two carbon molecular sieve adsorption towers, namely forming the continuous and continuous nitrogen conveying to the nitrogen buffer tank 7.
The online nitrogen supplementing unit comprises a plunger valve V6, a pressure regulating valve V7, a flow meter 701, a nitrogen analyzer 702, an interlocking switch device 8 and an oxygen content analyzer 9, wherein the oxygen content analyzer 9 is installed on a tail gas pipeline of the organic contaminated soil thermal desorption system, the plunger valve V6, the pressure regulating valve V7, the flow meter 701, the nitrogen analyzer 702 and the interlocking switch device 8 are sequentially installed on a nitrogen output pipeline of the gas buffer tank 7 from front to back, the interlocking switch device 8 is electrically connected with the oxygen content analyzer 9, and a PLC control system controls the on-off action of the interlocking switch device 8 according to the detection result of the oxygen content analyzer, so that the online automatic nitrogen supplementing into the thermal desorption system is realized.
Oxygen content analysis appearance 7 be arranged in detecting thermal desorption tail gas oxygen content, PLC control system remote display, warning and record can be followed to the oxygen content numerical value that surveys.
Two carbon molecular sieve adsorption tower 5 bottom be equipped with muffler 502 on the connecting pipeline.
C level filter, A level filter, H level filter all have profit recovery unit.
The utility model discloses the working process of device is as follows:
the air compressor obtains compressed air supply by taking ambient air as a raw material, has the main functions of providing enough air quantity and relatively constant air supply pressure (0.75-0.85 MPa), is one of necessary conditions for ensuring the normal work of a system, and the compressed air discharged from the air compressor 1 enters the air buffer tank 2 for temporary storage, has the main functions of controlling the overload operation of the air compressor 1 and preventing the pressure fluctuation of the raw material air, and also has the function of depositing partial oil and water in the compressed air. Compressed air sends into the air purification unit through air buffer tank 2, filters raw materials air in the air purification unit, preliminary treatment such as dehydration, deoiling, and cold machine 302 main function is the dewatering to ensure that the water content of the compressed air after cold machine drying process is up to standard. The C-stage filter 301, the A-stage filter 303 and the activated carbon adsorption tower 304 are matched equipment necessary for achieving water removal, oil removal and solid particle removal in the air source purification treatment process and enabling the quality of an air source entering the carbon molecular sieve adsorption tower 5 to reach a standard, the functions of all stages are different, the filtration treatment precision of the C-stage filter 301 is 3 mu, and the main function is primary oil-water filtration; the treatment precision of the A-stage filter 303 is 0.01 mu, and the main function is micro oil removal; the main function of the activated carbon adsorption tower 304 is to further remove oil and water.The purified air source enters the air storage tank 4 for temporary storage. The main function of the air storage tank 4 is to provide continuous and stable clean air for the nitrogen preparation unit by the subsequent pressure swing adsorption, and ensure that the nitrogen preparation unit by the pressure swing adsorption can work continuously and stably, the nitrogen preparation unit by the pressure swing adsorption is provided with two carbon molecular sieve adsorption towers 5 which are arranged in parallel, and the main function is to control an electromagnetic pneumatic valve Y by a programmable controller1-Y8The action sequence of the two towers can lead the two towers to alternately adsorb and desorb, thereby ensuring that the system continuously prepares nitrogen with certain purity, the nitrogen from the carbon molecular sieve adsorption tower 5 is further purified by an H-level filter (with the processing precision of 0.001 mu) and then is conveyed to a nitrogen buffer tank 7, and the nitrogen buffer tank 7 has certain capacity and mainly has the function of storing nitrogen. When the tail gas after the thermal desorption system is processed detects that the oxygen content is higher than 2% through the oxygen content analyzer 9, the interlocking switch device 8 can be automatically opened, and the nitrogen in the nitrogen buffer tank 7 passes through the plunger valve V6Pressure regulating valve V7And the flow meter 701 and the nitrogen analyzer 702 can be continuously and stably supplemented into the thermal desorption system so as to ensure that the oxygen content in the thermal desorption system meets the safety requirement of the system.
The following is an application example of the device of the utility model:
example one:
carrying out thermal desorption treatment by taking the oil sludge falling to the ground of a certain oil field as an object, directly heating the oil sludge in thermal desorption equipment by burning natural gas, controlling the temperature range of the oil sludge in the thermal desorption equipment to be 300-500 ℃, controlling the retention time to be 18min, supplying air required by combustion of the natural gas by an air blower, and controlling the ratio (volume ratio) of the natural gas to the air to be 1 by a proportional valve: when 10, the oxygen content in the thermal desorption equipment is shown to be 1.70% by the oxygen measuring instrument, and the site and the PLC system do not give an alarm, and when the ratio (volume ratio) of the natural gas to the air is adjusted to be 1: 10.5, the oxygen content in the thermal desorption equipment that the appearance shows of oxygen is 1.85%, and on-the-spot and PLC system all report to the police, is 1 when adjusting the proportion (the volume ratio) of natural gas and air: and 12, the oxygen measuring instrument displays that the oxygen content in the thermal desorption equipment is 2.3%, the interlocking switch device is triggered to be opened, the nitrogen in the nitrogen buffer tank is supplemented into the thermal desorption equipment until the oxygen content is lower than 2%, and the interlocking switch device is closed to stop nitrogen supplementation.
Example two:
carrying out thermal desorption treatment by taking tank bottom oil sludge of a certain oil field as an object, directly heating the oil sludge in thermal desorption equipment by burning natural gas, controlling the temperature range of the oil sludge in the thermal desorption equipment to be 300-500 ℃, keeping the temperature for 20min, providing air required by natural gas combustion by an air blower, and controlling the ratio (volume ratio) of the natural gas to the air to be 1 by a proportional valve: when 9.5 hours, the oxygen meter shows that the oxygen content in the thermal desorption equipment is 1.60%, and the site and the PLC system do not give an alarm, and when the ratio (volume ratio) of the natural gas to the air is adjusted to be 1: during 11, the oxygen content that the appearance shows thermal desorption equipment is 1.90% to the oxygen detector, and on-the-spot and PLC system all report to the police, is 1 when adjusting the proportion (the volume ratio) of natural gas and air: and when 12.5 hours, the oxygen measuring instrument displays that the oxygen content in the thermal desorption equipment is 2.5 percent, the interlocking switch device is triggered to be opened, the nitrogen in the nitrogen buffer tank is supplemented into the thermal desorption equipment until the oxygen content is lower than 2 percent, and the interlocking switch device is closed to stop nitrogen supplementation.
Example three:
carrying out thermal desorption treatment by taking oil sludge sand of a certain oil field as an object, directly heating the oil sludge in thermal desorption equipment by burning natural gas, controlling the temperature range of the oil sludge in the thermal desorption equipment to be 300-500 ℃, keeping the temperature for 20min, providing air required by natural gas combustion by an air blower, and controlling the ratio (volume ratio) of the natural gas to the air to be 1 by a proportional valve: when 9.0, the oxygen measuring instrument shows that the oxygen content in the thermal desorption equipment is 1.50%, the site and the PLC system do not give an alarm, and when the ratio (volume ratio) of the natural gas to the air is adjusted to be 1: 11.5, the oxygen content in the thermal desorption equipment that the appearance shows of oxygen is 1.95%, and on-the-spot and PLC system all report to the police, is 1 when adjusting the proportion (the volume ratio) of natural gas and air: and 13, the oxygen measuring instrument displays that the oxygen content in the thermal desorption equipment is 2.7%, the interlocking switch device is triggered to be opened, the nitrogen in the nitrogen buffer tank is supplemented into the thermal desorption equipment until the oxygen content is lower than 2%, and the interlocking switch device is closed to stop nitrogen supplementation.
Claims (7)
1. The utility model provides a device for controlling organic contaminated soil thermal desorption system tail gas oxygen content which characterized in that, the device is including the air purification preprocessing unit that meets in proper order, preparation nitrogen gas unit and online supplementary nitrogen gas unit, and the nitrogen gas output pipeline of preparation nitrogen gas unit is connected with organic contaminated soil thermal desorption system, provides nitrogen protection for organic contaminated soil thermal desorption system.
2. The device for controlling the oxygen content of the tail gas of the thermal desorption system of the organic contaminated soil according to claim 1, wherein the air purification pretreatment unit comprises an air compressor, an air buffer tank, an air purification unit and an air storage tank which are sequentially connected and arranged according to the gas direction, and the air purification unit comprises a C-grade filter, a cold dryer, an A-grade filter and an activated carbon adsorption tower which are sequentially connected and arranged according to the gas direction; the inlet end of the C-stage filter is connected with an air buffer tank, and the outlet end of the activated carbon adsorption tower is connected with an air storage tank.
3. The device for controlling the oxygen content of the tail gas of the thermal desorption system of the organic contaminated soil according to claim 1 or 2, wherein the nitrogen preparation unit comprises two carbon molecular sieve adsorption towers connected in parallel, a front converging pipeline of the two carbon molecular sieve adsorption towers is connected with an air storage tank, a rear converging pipeline is connected with the nitrogen buffer tank through an H-level filter, and the two carbon molecular sieve adsorption towers are controlled by the programmable controller to alternately operate to realize alternate adsorption and desorption, so that the nitrogen in the air is continuously separated, and the nitrogen is continuously conveyed to the nitrogen buffer tank.
4. The apparatus according to claim 3, wherein the bottom of each of the two carbon molecular sieve adsorption towers is provided with an exhaust pipe, and the exhaust pipe is provided with a silencer.
5. The device for controlling the oxygen content of the tail gas of the thermal desorption system of the organic contaminated soil according to claim 1 or 2, wherein the on-line nitrogen supplementing unit comprises an interlocking switch device and an oxygen content analyzer, the oxygen content analyzer is installed on a tail gas pipeline of the thermal desorption system of the organic contaminated soil, the interlocking switch device is installed on a nitrogen output pipeline of the nitrogen preparation unit, the interlocking switch device is electrically connected with the oxygen content analyzer, and the PLC control system controls the on-off action of the interlocking switch device according to the detection result of the oxygen content analyzer.
6. The device for controlling the oxygen content of the tail gas of the thermal desorption system of the organic contaminated soil according to claim 3, wherein a one-way throttle valve is arranged on a pipeline at the inlet end of the nitrogen buffer tank, and a plunger valve, a pressure regulating valve, a flow meter and a nitrogen analyzer are sequentially arranged on a pipeline at the outlet end from front to back.
7. The device for controlling the oxygen content of the tail gas of the thermal desorption system of the organic contaminated soil as claimed in claim 2, wherein: the air compressor is a screw air compressor, and two air compressors are arranged and can be independently controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921708806.0U CN211538956U (en) | 2019-10-11 | 2019-10-11 | Device for controlling oxygen content of tail gas of thermal desorption system of organic contaminated soil |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921708806.0U CN211538956U (en) | 2019-10-11 | 2019-10-11 | Device for controlling oxygen content of tail gas of thermal desorption system of organic contaminated soil |
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| CN211538956U true CN211538956U (en) | 2020-09-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111215439A (en) * | 2019-10-11 | 2020-06-02 | 广西博世科环保科技股份有限公司 | Method and device for controlling oxygen content of tail gas of thermal desorption system of organic contaminated soil |
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- 2019-10-11 CN CN201921708806.0U patent/CN211538956U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111215439A (en) * | 2019-10-11 | 2020-06-02 | 广西博世科环保科技股份有限公司 | Method and device for controlling oxygen content of tail gas of thermal desorption system of organic contaminated soil |
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