CN214976635U - Gas thermal desorption energy-saving structure based on energy optimization - Google Patents
Gas thermal desorption energy-saving structure based on energy optimization Download PDFInfo
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- CN214976635U CN214976635U CN202120561260.1U CN202120561260U CN214976635U CN 214976635 U CN214976635 U CN 214976635U CN 202120561260 U CN202120561260 U CN 202120561260U CN 214976635 U CN214976635 U CN 214976635U
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Abstract
The utility model provides a gas thermal desorption energy-saving structure, which comprises a gas thermal desorption system, a tail gas treatment system, a groundwater pumping treatment system and a normal temperature desorption or thermal desorption pretreatment system; when the exhaust temperature is 300-; when the temperature of the exhaust smoke is less than 300 ℃, the exhaust smoke is communicated to the underground water pumping treatment system and the normal-temperature desorption or thermal desorption pretreatment system; when the temperature of the exhaust smoke is higher than 500 ℃, the exhaust smoke is firstly reinjected through the secondary heating well, and the reinjected and cooled exhaust smoke is selected to be connected with a subsequent system according to the temperature of the exhaust smoke. The utility model discloses can set up reasonable heat energy retrieval and utilization technology according to the temperature of discharging fume, retrieve the thermal desorption heat energy of discharging fume, improve the holistic heat utilization rate of system, reduce the energy consumption.
Description
Technical Field
The utility model relates to a pollute soil restoration field particularly, relates to a multistage utilization technology of gas thermal desorption heat energy and application method thereof.
Background
The in-situ soil thermal desorption remediation technology can be implemented in situ in a polluted site, and organic pollutants in the polluted soil can be removed in modes of heating, extracting and the like without carrying out operations such as excavation and the like on the polluted soil, so that the effect of purifying the soil is achieved. The in-situ heating unit of the field is the core of an in-situ soil thermal desorption technology, and the technologies of in-situ resistance heating, in-situ steam injection heating, fuel gas heating and the like are common. The in-situ gas thermal desorption technology generates high-temperature gas through combustion of natural gas or liquefied petroleum gas, the high-temperature gas flows in a heating well to raise the temperature of a pollutant area, changes the physical and chemical properties of pollutants, promotes soil pollutants to desorb into a gas phase and a water phase, is extracted to separate from the underground environment, and is transferred to the ground for tail gas treatment.
The utility model discloses a gas thermal desorption burner is disclosed in the utility model patent document with publication number CN211694888U, this utility model is in the heating well with the help of flame tube ignition burning, the heat of burning passes through heat conduction section of thick bamboo wall and is absorbed conduction to whole barrel by the heat conduction oil, heat from inside toward outside quick conduction, the barrel surface forms comparatively even stabilizing the temperature, to the stratum synchronous heating of the different degree of depth, the realization is to the even synchronous heating in different degree of depth stratum, but overall structure lacks the heat recovery to the high temperature flue gas and utilizes the link, the thermal loss of discharging fume has been caused, heat utilization rate is low.
The invention discloses an efficient energy-saving clean in-situ gas thermal desorption device and method in patent document with publication number CN111203432A, the invention enhances airflow disturbance through a pore plate to enable combustion to be more complete and uniform, and generated high-temperature gas is led to shallow layer pile body soil after the soil is heated; extracting underground water containing pollutants and steam to the surface of the earth by using a two-phase extraction well, and performing conventional water treatment on condensed water; and (4) leading the polluted gas to a subsequent valve switching type three-bed regenerative oxidation furnace for treatment. The utilization rate of heat energy is improved by heating the shallow layer pile body soil and the heat accumulating type oxidation furnace through high-temperature flue gas. But the combustor needs to be modified, and a regenerative oxidation furnace needs to be installed, so that the equipment cost is high, and the economical efficiency is poor.
In conclusion, the existing gas thermal desorption technology has the problems of high equipment modification cost, large waste heat of exhaust gas, low heat utilization rate and poor associativity with other soil treatment technologies.
SUMMERY OF THE UTILITY MODEL
For solving above problem, the utility model discloses to gas thermal desorption technique, developed the energy-conserving structure of gas thermal desorption based on energy optimization, combine gas thermal desorption technique and other field treatment processes, recycle flue gas heat energy effectively solves the equipment transformation with high costs, the heat utilization efficiency is low and with the poor problem of other soil treatment technique associativity.
In order to achieve the above object, the utility model adopts the following technical scheme:
the utility model provides a gas thermal desorption energy-saving structure which characterized in that: the system comprises a gas thermal desorption system, a tail gas treatment system, a groundwater pumping treatment system and a normal temperature desorption or thermal desorption pretreatment system;
the gas thermal desorption system can be selectively communicated with the tail gas treatment system, and the extracted tail gas of the tail gas treatment system and the combustion air of the secondary combustion chamber are heated through the heat exchange system;
the gas thermal desorption system can be selectively communicated with the underground water pumping treatment system, and heat energy of the underground water pumping treatment system is recycled through the heating pipe;
the gas thermal desorption system can be selectively communicated with the normal-temperature desorption or thermal desorption pretreatment system, and the heat energy is recycled for the normal-temperature desorption system or the thermal desorption pretreatment system through the heating pipe.
The energy-conserving structure of gas thermal desorption, wherein: the gas thermal desorption system comprises a combustor, a primary heating well and an extraction well, wherein the primary heating well consists of an inner pipe and an outer pipe, the inner pipe can allow high-temperature flue gas to flow downwards to the bottom and then flow out of the outer pipe, and the pipe wall of the outer pipe can exchange heat with surrounding soil; the combustor can inject high-temperature flame generated by combustion of liquefied petroleum gas or natural gas into an inner pipe of the primary heating well; the extraction well wall surface is provided with a slot which is used as a passage for soil gas to enter the extraction pipe.
The energy-conserving structure of gas thermal desorption, wherein: the gas thermal desorption system further comprises a burner second-stage heating well, wherein the second-stage heating well is connected in series at the downstream of the first-stage heating well and also consists of an inner pipe and an outer pipe.
The energy-conserving structure of gas thermal desorption, wherein: the tail gas treatment system comprises a first heat exchanger, a second heat exchanger, a blower, a secondary combustion chamber and a chimney, wherein the first heat exchanger is used for transferring the heat of the high-temperature flue gas to the extracted tail gas; the second heat exchanger is used for transferring the heat of the high-temperature flue gas to combustion air; the secondary combustion chamber is used for purifying and combusting the extracted tail gas and then discharging the purified and combusted tail gas to the atmosphere; the chimney is used for discharging low-temperature flue gas subjected to two-stage heat exchange.
The energy-conserving structure of gas thermal desorption, wherein: the underground water pumping treatment system comprises an aeration tank, a heat exchange pipe and an aeration pipe, wherein the aeration tank stores pumped polluted underground water, the heat exchange pipe is formed by a plurality of branch pipes in parallel and is spirally arranged in the aeration tank from bottom to top, and the branch pipes are provided with flow regulating valves for regulating the flow of flue gas in each branch pipe; the aeration pipe can aerate the interior of the aeration tank.
The energy-conserving structure of gas thermal desorption, wherein: the normal-temperature analysis system or the thermal desorption pretreatment system comprises a floor heating system, turning equipment and a greenhouse.
The energy-conserving structure of gas thermal desorption, wherein: the smoke exhaust position of the gas thermal desorption system is provided with a temperature sensor, the temperature sensor is in signal connection with a controller, and the controller can select the smoke exhaust communication direction according to temperature signals.
The utility model discloses a gas thermal desorption energy-saving structure and application method thereof has carried out multistage recycle with the heat energy of discharging fume of gas thermal desorption technique, has improved the holistic heat utilization rate of gas thermal desorption technique.
The utility model discloses a mode with gas thermal desorption technique and other technologies combined use can improve the holistic heat utilization rate in place. The utility model discloses equipment is large-scale engineering application technique, is applicable to the restoration in big, medium, small-size place, and the range of application is extensive, has the characteristics that many technologies, many technologies combine, can improve the holistic heat utilization in place greatly and use up.
Drawings
Fig. 1 is the utility model provides an energy-conserving structural schematic diagram of high exhaust gas temperature.
Fig. 2 is a schematic view of the low smoke temperature energy-saving structure provided by the present invention.
FIG. 3 is a schematic diagram of the pipe arrangement mode of the aeration tank.
FIG. 4 is a schematic diagram of a series pattern of heater wells.
Description of reference numerals: a gas thermal desorption system 1; a tail gas treatment system 2; a groundwater extraction treatment system 3; a normal temperature desorption system or a thermal desorption pretreatment system 4; a combustor 11; a primary heater well 12; a secondary heating well 13; an extraction well 14; a first heat exchanger 21; a blower 22; a second heat exchanger 23; a secondary combustion chamber 24; a chimney 25; an aeration tank 31; a heat exchange main pipe 32; a flow valve 33; heat exchange branch pipes 34; an aeration pipe 35; a floor heating system 41; a turning device 42; a greenhouse 43.
Detailed Description
As shown in fig. 1 and 2, the utility model provides an energy-conserving structure of gas thermal desorption, including gas thermal desorption system 1, tail gas processing system 2, groundwater take processing system 3 and normal atmospheric temperature analysis or thermal desorption pretreatment system 4 out, several sets of gas thermal desorption energy-conserving structures both can the exclusive use, also can jointly use through series connection or parallelly connected mode.
When the temperature of the discharged smoke of the gas thermal desorption system 1 is 300-500 ℃, the discharged smoke is directly connected with the tail gas treatment system 2; when the temperature of the exhaust smoke of the gas thermal desorption system 1 is less than 300 ℃, the exhaust smoke is connected with a groundwater pumping treatment system 3 and a normal temperature desorption or thermal desorption pretreatment system 4; when the exhaust gas temperature of the gas thermal desorption system 1 is higher than 500 ℃, the secondary heating well 13 can be arranged for flue gas reinjection, and the exhaust gas after reinjection and cooling is connected with the tail gas treatment system 2 or the underground water pumping treatment system 3 and the normal-temperature desorption or thermal desorption pretreatment system 4 according to the temperature.
The utility model discloses can realize automated control, set up temperature sensor in the position of discharging fume of gas thermal desorption system 1, temperature sensor signal connection director, the controller is according to temperature signal, selects the intercommunication direction of discharging fume.
The gas thermal desorption system 1 comprises a combustor 11, a primary heating well 12, a secondary heating well 13 and an extraction well 14 which are connected in sequence. The combustor 11 compresses combustion-supporting air and fuel gas to be sprayed into the inner pipe of the primary heating well 12, high-temperature flue gas flows back upwards from the outer pipe of the primary heating well 12 after reaching the bottom and enters the inner pipe of the secondary heating well 13 through the connecting pipe, and the high-temperature flue gas flows back upwards from the outer pipe of the secondary heating well 13 after reaching the bottom and is finally discharged to a flue gas heat energy recycling system; the extraction well 14 extracts the contaminated soil from the contaminated soil reservoir to the tail gas treatment system 2.
The tail gas treatment system 2 comprises a first heat exchanger 21, a blower 22, a second heat exchanger 23, a secondary combustion chamber 24 and a chimney 25. The first heat exchanger 21 exchanges heat between the high-temperature flue gas and the polluted soil gas extracted by the extraction well 14, the heat of the high-temperature flue gas is transferred to the polluted soil gas, the temperature of the polluted soil gas is increased, the temperature of the high-temperature flue gas is reduced, and the cooled high-temperature flue gas enters the second heat exchanger 23; the blower 22 blows combustion-supporting air into the second heat exchanger 23, the combustion-supporting air exchanges heat with the high-temperature flue gas, the heat of the high-temperature flue gas is transferred to the combustion-supporting air, the temperature of the combustion-supporting air is increased, meanwhile, the temperature of the high-temperature flue gas is reduced, and the cooled high-temperature flue gas is directly discharged through a chimney; the polluted soil gas and the combustion-supporting air are oxidized and combusted in the secondary combustion chamber 24, and the fuel consumption of the secondary combustion chamber 24 can be effectively reduced through the heated polluted soil gas and the combustion-supporting air.
The groundwater pumping treatment system 3 (as shown in fig. 3) comprises an aeration tank 31, a heat exchange main pipe 32, a flow valve 33, heat exchange branch pipes 34 and aeration pipes 35, wherein the aeration tank 31 stores pumped polluted groundwater, the heat exchange main pipe 32 is connected with the gas thermal desorption system 1, the heat exchange branch pipes 34 are connected with the heat exchange main pipe 32 through the flow valve 33, the flow valve 33 can adjust the temperature of the branch pipes 34 in a mode of adjusting the flow rate of smoke, the heat exchange branch pipes 34 are spirally arranged in the aeration tank from bottom to top, a plurality of groups are arranged according to the size of the aeration tank 31, high-temperature smoke exchanges heat with the polluted groundwater in the aeration tank 31 through the heat exchange branch pipes 34, the temperature of the polluted groundwater in the aeration tank 31 is increased, the treatment speed of the polluted groundwater is increased, the aeration pipes 35 aerate the bottom of the aeration tank 31, and oxygen is introduced into the aeration tank on one hand, on the other hand, the device can be used as an air source for air stripping treatment, and can play a role in stirring polluted underground water in the aeration tank, so that the heating uniformity of the aeration tank is ensured;
besides the aeration process, the aeration pipe can be replaced by a chemical injection pipe, underground water is purified through chemical oxidation, and the heat exchange pipe improves the temperature of the water tank and plays a role in heat strengthening.
The system 4 for normal-temperature desorption or thermal desorption pretreatment comprises a floor heating system 41, turning equipment 42 and a greenhouse 43, wherein a ground heating pipe which is arranged in a circuitous way is laid in the floor heating system 41, and high-temperature flue gas flows in the floor heating pipe to heat the ground of the heterotopic thermal desorption system so as to heat polluted soil; the turning equipment 42 ensures the uniformity of soil heating in a manner of turning soil piles; the greenhouse 43 stores polluted soil, keeps the temperature, reduces the heat loss and simultaneously prevents polluted gas from escaping; and transferring the tail gas heat of the gas thermal desorption system to an ex-situ thermal desorption pretreatment process.
Examples illustrate that:
the present invention will be described in detail below by way of example, a series heating well arrangement mode is shown in fig. 4, a secondary heating well 13 is distributed at the cold spot position of a primary heating well 12 as a supplementary heat source, the soil heating target is 100 ℃, the burner power is 20kw, the exhaust gas temperature of the primary heating well is about 550 ℃, the exhaust gas temperature of the secondary heating well is about 350 ℃, the acting radius of the primary heating well is 2-3m, and the acting range of the secondary heating well is 1-2m, through field measurement.
Example 1:
in-situ remediation is carried out on a certain Suzhou chemical plant remediation site through a series heating well technology, and after extraction tail gas is dehumidified by a gas-liquid separator, the moisture content of the tail gas is about 50% and the temperature is 90 ℃; the temperature of the high-temperature flue gas is 350-400 ℃, the high-temperature flue gas and the tail gas enter a first heat exchanger for heat exchange according to the gas quantity ratio of 0.8-1:1, the temperature of the tail gas rises to 200 ℃ after heat exchange, the temperature of the high-temperature flue gas is reduced to 220 ℃, the tail gas enters a secondary combustion chamber for oxidation treatment, and the high-temperature flue gas enters a second heat exchanger for secondary heat exchange; the temperature of combustion-supporting air is about 20 ℃, the temperature of high-temperature flue gas is 220 ℃, the high-temperature flue gas and the combustion-supporting air enter a second heat exchanger for heat exchange according to the gas quantity ratio of 1:1, the temperature of the combustion-supporting air rises to 100 ℃ after heat exchange, the temperature of the high-temperature flue gas is reduced to 120 ℃, the combustion-supporting air enters a secondary combustion chamber, and the high-temperature flue gas is discharged through a chimney; the results show that 15-25% energy savings can be achieved after heat exchange.
Example 2:
in the restoration site of a certain chemical plant in Jiangsu, the VOC pollution of underground water is treated by an aeration tank, and the volume of the aeration tank is 150m3The water temperature is lower in winter and is about 10 ℃, the treatment efficiency is low, and the treatment is acceleratedThe treatment efficiency is that the heat exchange tubes which are coiled from bottom to top are arranged in the aeration tank, the high-temperature flue gas discharged by the series heating well group enters the heat exchange tubes from the lower part, the temperature of the high-temperature flue gas is reduced from 350 ℃ to about 80 ℃ after heat exchange, the sewage in the aeration tank is increased from 10 ℃ to 40 ℃, the heat exchange efficiency is effectively accelerated, and the treatment speed is increased by 30-40%.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1. The utility model provides a gas thermal desorption energy-saving structure which characterized in that: the system comprises a gas thermal desorption system, a tail gas treatment system, a groundwater pumping treatment system and a normal temperature desorption or thermal desorption pretreatment system;
the gas thermal desorption system can be selectively communicated with the tail gas treatment system, and the extracted tail gas of the tail gas treatment system and the combustion air of the secondary combustion chamber are heated through the heat exchange system;
the gas thermal desorption system can be selectively communicated with the underground water pumping treatment system, and heat energy of the underground water pumping treatment system is recycled through the heating pipe;
the gas thermal desorption system can be selectively communicated with the normal-temperature desorption or thermal desorption pretreatment system, and the heat energy is recycled for the normal-temperature desorption system or the thermal desorption pretreatment system through the heating pipe.
2. The gas thermal desorption energy-saving structure of claim 1, characterized in that: the gas thermal desorption system comprises a combustor, a primary heating well and an extraction well, wherein the primary heating well consists of an inner pipe and an outer pipe, the inner pipe can allow high-temperature flue gas to flow downwards to the bottom and then flow out of the outer pipe, and the pipe wall of the outer pipe can exchange heat with surrounding soil; the combustor can inject high-temperature flame generated by combustion of liquefied petroleum gas or natural gas into an inner pipe of the primary heating well; the extraction well wall surface is provided with a slot which is used as a passage for soil gas to enter the extraction pipe.
3. The gas thermal desorption energy-saving structure of claim 2, characterized in that: the gas thermal desorption system further comprises a burner second-stage heating well, wherein the second-stage heating well is connected in series at the downstream of the first-stage heating well and also consists of an inner pipe and an outer pipe.
4. The gas thermal desorption energy-saving structure of claim 1, characterized in that: the tail gas treatment system comprises a first heat exchanger, a second heat exchanger, a blower, a secondary combustion chamber and a chimney, wherein the first heat exchanger is used for transferring the heat of the high-temperature flue gas to the extracted tail gas; the second heat exchanger is used for transferring the heat of the high-temperature flue gas to combustion air; the secondary combustion chamber is used for purifying and combusting the extracted tail gas and then discharging the purified and combusted tail gas to the atmosphere; the chimney is used for discharging low-temperature flue gas subjected to two-stage heat exchange.
5. The gas thermal desorption energy-saving structure of claim 1, characterized in that: the underground water pumping treatment system comprises an aeration tank, a heat exchange pipe and an aeration pipe, wherein the aeration tank stores pumped polluted underground water, the heat exchange pipe is formed by a plurality of branch pipes in parallel and is spirally arranged in the aeration tank from bottom to top, and the branch pipes are provided with flow regulating valves for regulating the flow of flue gas in each branch pipe; the aeration pipe can aerate the interior of the aeration tank.
6. The gas thermal desorption energy-saving structure of claim 1, characterized in that: the normal-temperature analysis system or the thermal desorption pretreatment system comprises a floor heating system, turning equipment and a greenhouse.
7. The gas thermal desorption energy-saving structure of claim 1, characterized in that: the smoke exhaust position of the gas thermal desorption system is provided with a temperature sensor, the temperature sensor is in signal connection with a controller, and the controller can select the smoke exhaust communication direction according to temperature signals.
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| CN202120561260.1U CN214976635U (en) | 2021-03-18 | 2021-03-18 | Gas thermal desorption energy-saving structure based on energy optimization |
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