TWI750668B - Heat treatment system for soil pollution - Google Patents

Abstract

The invention relates to a heat treatment system for soil pollution. Primarily, the oil-contaminated soil is dried by a drying unit and then transported to a thermal desorption unit, where the soil is heated by high temperature, so that the oil contained in the soil is evaporated into a gaseous state and then separated from the soil to achieve soil purification effect. The dust, water gas and oil gas caused by the drying and thermal desorption process in the drying unit and the thermal desorption unit will be removed by a dust removal unit, and then the water gas and oil gas will be cooled to a liquid state by a heat exchange unit, and transported to an oil-water separation unit for oil-water separation. Furthermore, organic gas contained in the oil gas will be pyrolyzed into water and carbon dioxide by an exhaust gas treatment unit and then discharged into the environment. The residual heat generated by the operation of the thermal desorption unit can be used by the drying unit and a dirt pretreatment unit to save energy consumed by the overall system operation and achieve effective cost reduction and other benefits.

Description

Heat Treatment System for Soil Pollution

The present invention relates to a heat treatment system for soil pollution, in particular to a treatment that can effectively save the energy consumed by the polluted soil in the heat treatment process, and can properly treat the exhaust gas generated by thermal desorption to avoid secondary pollution to the environment. system.

According to the current petrochemical industry factories, gas stations and oil storage tanks, if the storage and transportation of oil products are not properly disposed of, it may cause gasoline, diesel oil, kerosene and aviation oil to penetrate into the soil, resulting in soil pollution. And then endanger the human living environment, it is necessary to remediate the contaminated soil to maintain environmental safety.

Existing remediation operations for oily soils, etc., are generally carried out by means of thermal treatment systems for desorption. The thermal desorption technology refers to heating the polluted soil at high temperature, so that the oil and other pollutants in the soil pass through the thermal desorption system. The oil and other pollutants are volatilized into a gaseous state and then separated from the soil, so as to achieve the purpose of remediating and purifying the soil. Although the existing heat treatment system can achieve the effect of effectively removing pollutants such as oil contained in the soil; however, the exhaust gas generated by the volatilization of pollutants during the heat treatment process is not properly treated, that is, it is discharged into the atmosphere, causing secondary pollution to the environment In addition, the operation of the existing heat treatment system requires a lot of energy, so the operation cost is quite expensive, so that the implementation and use are still not ideal.

The reason is that the inventors have developed the present invention with the help of years of manufacturing and design experience and knowledge in related fields, in view of the above-mentioned deficiencies in the use of the existing heat treatment systems for soil pollution.

The present invention relates to a heat treatment system for soil pollution, and its main purpose is to provide a system that can effectively save the energy consumed by the polluted soil in the heat treatment process, and can properly treat the exhaust gas generated by thermal desorption, so as to avoid causing secondary pollution to the environment. Sub-contaminated treatment system.

In order to achieve the above implementation purpose, the inventors have developed the following soil pollution heat treatment system, which includes: a drying unit, so that the drying unit is formed with a first sewage input end and a first sewage output end. , and the drying unit is provided with a first dust discharge end on the same side of the first dirt output end, and the drying unit is provided with a first waste heat receiving end; a thermal desorption unit, which makes the thermal desorption unit A second dirt input end and a second dirt output end are formed opposite, and a first dirt output end of the drying unit and the second dirt input end of the thermal desorption unit are formed with a first The sewage conveying pipeline is connected, and the thermal desorption unit is provided with a second dust discharge end on the same side of the second sewage output end, and the thermal desorption unit is provided with a first waste heat output end, so as to be connected with the second waste heat output end. The first waste heat receiving ends of the drying unit are connected by a first heat recovery pipeline; the two dedusting units include a first dedusting unit and a second dedusting unit, so that the first dedusting unit is formed with opposite A first input end and a first output end, the first input end of the first dust removal unit and the first dust discharge end of the drying unit are connected by a first dust collection pipeline, and the The two dust removal units are formed with a second input end and a second output end opposite to each other, and a second dust collection end is formed between the second input end of the second dust removal unit and the second dust discharge end of the thermal desorption unit connected to the pipeline; The two heat exchange units include a first heat exchange unit and a second heat exchange unit, so that the first heat exchange unit is provided with a first introduction end, so as to connect with the first output end of the first dust removal unit. A first conveying pipeline is connected, and the second heat exchange unit is provided with a second introduction end, so as to be connected with the second output end of the second dust removal unit by a second conveying pipeline, and the second heat exchange unit is connected with a second conveying pipeline. The first heat exchange unit and a first condensing module are connected by a first cooling pipeline, and the second heat exchange unit and a second condensing module are connected by a second cooling pipeline, and the other The first heat exchange unit and the second heat exchange unit are respectively provided with a first tail gas output end and a second tail gas output end; A sewage input end is connected with a second sewage conveying pipeline, and the sewage pretreatment unit is provided with a second waste heat receiving end, and the drying unit is provided with a second waste heat output end, and the The second waste heat receiving end of the soil pretreatment unit and the second waste heat output end of the drying unit are connected by a second heat recovery pipeline, and a second heat recovery pipe is connected between the soil pretreatment unit and the first heat exchange unit. The heat exchange pipelines are connected; the second oil-water separation unit includes a first oil-water separation unit and a second oil-water separation unit, so that the first heat exchange unit is provided with a first waste liquid output end to connect with the first oil-water separation unit. The input ends of the oil-water separation unit are connected by a first waste liquid pipeline, and the second heat exchange unit is provided with a second waste liquid output end, so as to connect with the input end of the second oil-water separation unit by a first waste liquid pipeline. Two waste liquid pipelines are connected; an exhaust gas treatment unit connects the first exhaust gas output end of the first heat exchange unit and the exhaust gas treatment unit with a first exhaust gas conveying pipeline, and the second heat exchange unit is connected by a first exhaust gas transmission pipeline. The second exhaust gas output end of the exchange unit is connected with the exhaust gas processing unit by a second exhaust gas conveying pipeline.

The above-mentioned heat treatment system for soil pollution, wherein the drying unit is an indirect heating rotary furnace, which mainly includes a first inner rotary furnace and a first fixed outer furnace covering the first inner rotary furnace, and makes The opposite ends of the first inner rotary furnace of the drying unit respectively form the first soil input end and the first soil output end, and the first inner rotary furnace is provided with the first soil output end on the same side of the first soil output end. The first dust discharge end is provided with the first waste heat receiving end in the first fixed outer furnace, and the thermal desorption unit is a The indirect heating rotary furnace mainly includes a second inner rotary furnace and a second fixed outer furnace covering the second inner rotary furnace, so that the opposite ends of the second inner rotary furnace of the thermal desorption unit form the second inner rotary furnace. The dirt input end and the second dirt output end, and the second inner rotary furnace is provided with its second dust discharge end on the same side of its second dirt output end, and the second fixed outer furnace is provided with its second dust discharge end. The first waste heat output terminal.

The heat treatment system for soil pollution as described above, wherein the heating temperature of the first inner rotary furnace of the drying unit is set to 100-200°C, and the heating temperature of the first fixed outer furnace is set to be 250-800°C, In addition, the heating temperature of the second inner rotary furnace of the thermal desorption unit is set at 450-900°C, and the heating temperature of the second fixed outer furnace is set at 600-1050°C.

The heat treatment system for soil pollution as described above, wherein, the exhaust gas treatment unit comprises a mixed explosion-proof device, an exhaust gas cracking module and a chimney, and the mixed explosion-proof device, the exhaust gas cracking module and the chimney are respectively connected with a transmission line. The gas pipelines are connected in sequence, and the first exhaust gas output end of the first heat exchange unit and the hybrid explosion-proof device are connected by the first exhaust gas conveying pipeline, and the second exhaust gas of the second heat exchange unit is output. The end is connected with the mixed explosion-proof device by the second exhaust gas conveying pipeline, and the mixed explosion-proof device is connected with a third inert gas input pipeline.

The heat treatment system for soil pollution as described above, wherein, the exhaust gas treatment unit further includes an exhaust gas reduction module, so that the exhaust gas reduction module is arranged between the exhaust gas cracking module and the chimney, and is connected with the exhaust gas cracking module. and the chimney are respectively connected by a gas pipeline.

In the above heat treatment system for soil pollution, wherein the mixed explosion-proof device of the exhaust gas treatment unit and the exhaust gas cracking module are connected with a gas pipeline with a minimum explosion limit analyzer.

In the thermal treatment system for soil pollution as described above, the exhaust gas cracking module of the exhaust gas treatment unit is a direct-fired incinerator or a regenerative incinerator.

The thermal treatment system for soil pollution as described above, wherein the drying unit is connected to a first inert gas input pipeline on the same side of the first sewage input end, and the thermal desorption unit is connected to the second sewage input of the thermal desorption unit. The same side of the end is connected with a second inert gas input pipeline.

Therefore, when the present invention is used and implemented, the oily soil is dried by the drying unit and then sent to the thermal desorption unit, so that the oil contained in the soil is volatilized into a gaseous state after being heated at a high temperature in the thermal desorption unit. It is separated from the soil to achieve the effect of purifying the soil, and the dust, water vapor and oil and gas caused by the drying and thermal desorption of the oily soil in the drying unit and the thermal desorption unit will be removed by the dust removal unit. The exchange unit cools the water gas and oil and gas into a liquid state, and then transports it to the oil-water separation unit for oil-water separation. In addition, the organic gas contained in the oil and gas will be heated and cracked into water and carbon dioxide by the tail gas treatment unit and then discharged into the environment. The waste heat generated by the operation of the unit can be used for the drying unit and the sewage pre-treatment unit, so as to save the energy consumed by the operation of the overall system and effectively reduce the cost.

1: Drying unit

11: The first inner rotary furnace

12: The first fixed outer furnace

13: The first inert gas input line

2: Thermal desorption unit

21: Second inner rotary furnace

22: Second fixed outer furnace

23: The first sewage conveying pipeline

24: Second inert gas input line

25: The first heat recovery line

3: Dust removal unit

31: The first dust removal unit

32: Second dust removal unit

33: The first dust collection pipeline

34: The second dust collection pipeline

35: The first delivery pipeline

36: Second delivery pipeline

4: heat exchange unit

41: The first heat exchange unit

42: Second heat exchange unit

43: heat exchange pipeline

44: The first condensation module

45: The first cooling line

46: Second condensing module

47: Second cooling line

5: Oil-water separation unit

51: The first oil-water separation unit

52: Second oil-water separation unit

53: The first waste liquid pipeline

54: Second waste liquid pipeline

6: Exhaust gas treatment unit

61: Hybrid explosion-proof device

611: Third inert gas input line

62: Exhaust gas cracking module

63: Exhaust gas reduction module

64: Chimney

65: Gas pipeline

66: The first exhaust gas delivery pipeline

67: Second exhaust gas delivery pipeline

68: Extraction module

69: Minimum Explosive Limit Analyzer

7: The first sewage pretreatment unit

71: Second sewage conveying pipeline

72: Second heat recovery line

8: Soil treatment unit to be tested

81: The third sewage conveying pipeline

The first picture: the structure diagram of the present invention

In order to make the technical means of the present invention and the effects that can be achieved, more complete and clear disclosure, the detailed description is as follows, please refer to the disclosed drawings and drawing numbers: First, please refer to the first figure. Shown, the heat treatment system for soil pollution of the present invention comprises: a drying unit (1), which is an indirect heating rotary furnace, including a first inner rotary furnace (11) and a coating of the first inner rotary furnace (11) The first fixed outer furnace (12), the heating temperature of the first inner rotary furnace (11) is set to 100-200°C, and the heating temperature of the first fixed outer furnace (12) is set to 250°C ~ 800 ° C, and the first inner rotary furnace (11) is formed with a first dirt input end and a first dirt output end opposite, and the first dirt of the first inner rotary furnace (11) is formed. The input end is connected with a first sewage pre-processing unit (7) by a second sewage conveying pipeline (71), and the first inner rotary furnace (11) is connected to the same first sewage input end. A first inert gas input pipeline (13) is connected to the side, and the first inner rotary furnace (11) is provided with a first dust discharge end on the same side of the first dirt output end, and the first fixed outer The furnace (12) is provided with a second waste heat output end to be connected with the second waste heat receiving end of the soil pretreatment unit (7) by a second heat recovery pipeline (72); a thermal desorption unit (72) 2), is an indirect heating rotary furnace, comprising a second inner rotary furnace (21) and a second fixed outer furnace (22) covering the second inner rotary furnace (21), the second inner rotary furnace (22) The heating temperature of (21) is set at 450~900°C, and the heating temperature of the second fixed outer furnace (22) is set at 600~1050°C, and the second inner rotary furnace (21) is formed with a relative A second dirt input end and a second dirt output end, and connect the second dirt input end of the second inner rotary furnace (21) with the first inner rotary furnace (11) of the drying unit (1) The first sewage output end is connected with a first sewage conveying pipeline (23), and the second inner rotary furnace (21) is connected with a second inert gas on the same side of the second sewage input end an input pipeline (24), and a third sewage conveying pipeline (81) is connected between the second sewage output end of the second inner rotary furnace (11) and a soil processing unit (8) to be tested , and the second inner rotary furnace (21) is provided with a second dust discharge end on the same side of its second dirt output end, and the second fixed outer furnace (22) is provided with a first waste heat output end, so as to A first heat recovery pipeline (25) is connected with the first waste heat receiving end of the first fixed outer furnace (12) of the drying unit (1); two dust removal units (3) include a first heat recovery pipe (25). A dust removal unit (31) and a second dust removal unit (32), so that the first dust removal unit (31) is formed with a first input end and a first output end opposite, and the first dust removal unit (31) is formed with a first input end and a first output end opposite. 31) The first input end of the drying unit (1) is connected with the first dust discharge end of the drying unit (1) by a first dust collection pipeline (33), and the second dust removal unit (32) is formed with an opposite one. the second input terminal and a the second output end, and the second input end of the second dust removal unit (32) and the second dust discharge end of the thermal desorption unit (2) are connected by a second dust collection pipeline (34); The two heat exchange units (4) comprise a first heat exchange unit (41) and a second heat exchange unit (42), so that the first heat exchange unit (41) is provided with a first introduction end to communicate with The first output end of the first dust removal unit (31) is connected with a first conveying pipeline (35), and the second heat exchange unit (42) is provided with a second inlet end to connect with the second dust removal unit The second output end of the unit (32) is connected by a second conveying pipeline (36), and a heat exchange pipeline is connected between the first heat exchange unit (41) and the soil pretreatment unit (7) (43) are connected, and the first heat exchange unit (41) is connected with the first cooling line (45) of a first condensing module (44) through the heat exchange line (43), and the other is The second heat exchange unit (42) and a second condensing module (46) are connected by a second cooling pipeline (47); the second oil-water separation unit (5) includes a first oil-water separation unit (51) and a second oil-water separation unit (52), so that the first heat exchange unit (41) is provided with a first waste liquid output end, so as to connect with the input end of the first oil-water separation unit (51) A first waste liquid pipeline (53) is connected, and the second heat exchange unit (42) is provided with a second waste liquid output end, so as to connect with the input end of the second oil-water separation unit (52) by a The second waste liquid pipeline (54) is connected; an exhaust gas treatment unit (6) includes a mixed explosion-proof device (61), an exhaust gas cracking module (62), an exhaust gas reduction module (63) and a chimney (64), so that the mixed explosion-proof device (61), the exhaust gas cracking module (62), the exhaust gas reduction module (63) and the chimney (64) are respectively connected with a gas pipeline (65) in sequence, and the The first heat exchange unit (41) is provided with a first exhaust gas output end, which is connected with the hybrid explosion-proof device (61) by a first exhaust gas conveying pipeline (66), and makes the second heat exchange unit ( 42) A second exhaust gas output end is provided to connect with the hybrid explosion-proof device (61) by a second exhaust gas delivery pipeline (67), and between the first exhaust gas delivery pipeline (66) and the second exhaust gas The conveying pipelines (67) are each provided with at least one extraction module (68) such as a windmill, and a third inert gas input pipeline (611) is connected to the mixed explosion-proof device (61). device (61) with tail A minimum explosion limit analyzer (69) is arranged between the gas transmission pipelines (65) connected to the gas cracking module (62), and the exhaust gas cracking module (62) can be a direct-fired incinerator (TO) or Regenerative incinerator (RTO).

Accordingly, when using and implementing, the soil polluted by gasoline, diesel, kerosene or aviation oil is placed in the sewage pre-treatment unit (7) to be preheated to 40~80°C, and then the soil containing The oily soil is transported into the first inner rotary furnace (11) of the drying unit (1) through the second soil transportation pipeline (71), so that the oily soil is transported in the first inner rotary furnace (11) to the first inner rotary furnace (11). Heating and drying at a temperature of about 100-200°C for about 20-60 minutes, and steaming out the water and low-boiling oil products contained in the oily soil.

Continue to transport the dried oily soil to the second inner rotary furnace (21) of the thermal desorption unit (2) through the first soil conveying pipeline (23), so that the oily soil can be transported to the second inner rotary furnace (21) of the thermal desorption unit (2). The second inner rotary furnace (21) is heated at a high temperature of about 450~900°C for about 20~60 minutes, so that all the water and various oil products in the soil are evaporated, and completely desorbed and separated from the soil, so as to achieve the effect of purifying the soil. The purified soil is transported to the soil processing unit (8) to be tested through the third soil transport pipeline (81) to check whether the soil still contains oil and other pollutants. It is worth mentioning that the first inner rotary furnace (11) and the second inner rotary furnace (21) of the present invention are closed negative pressure environments, and will depend on the oil concentration of the oily soil. The first inert gas input pipeline (13) and the second inert gas input pipeline (24) of the inner rotary furnace (11) and the second inner rotary furnace (21) inject inert gas such as nitrogen into the first inner rotary furnace ( 11) and the second inner rotary furnace (21) to ensure that there is no danger of explosion when the oil is evaporated and desorbed.

Furthermore, when the oily soil is heated by rotation in the first inner rotary furnace (11), the resulting dust, water vapor and oil and gas will enter the first dust removal unit through the first dust collection pipeline (33). In (31), the dust, water vapor and oil and gas, etc. caused by the oily soil during the rotary heating in the second inner rotary furnace (21) will also enter the second dust removal through the second dust collection pipeline (34). In the unit (32), the particulate pollutants such as dust will remain in the first dust removal unit (31) and the second dust removal unit (32), and the water vapor and oil and gas will pass through the first conveying pipeline (35) respectively. ) and the second conveying pipeline (36) are conveyed to the first heat exchange unit (41) and the second heat exchange unit (42). °C, while the second dust removal unit (32) The output water vapor and oil and gas are about 450°C. After being input to the first heat exchange unit (41) and the second heat exchange unit (42) respectively, the first heat exchange unit (41) and the second heat exchange unit (42) After the first condensing module (44) and the second condensing module (46) connected to the two heat exchange units (42) are cooled to about 10-60° C., the water vapor and the oil and gas system will condense into liquid, so that the The first waste liquid pipeline (53) and the second waste liquid pipeline (54) connecting the first heat exchange unit (41) and the second heat exchange unit (42) are transported to the first oil-water separation unit (51) and The second oil-water separation unit (52) performs oil-water separation, and the separated waste water and mixed oil system can be recovered and reused.

In addition, the organic gas (voc) that is not condensed into liquid at the first heat exchange unit (41) and the second heat exchange unit (42) will pass through the first exhaust gas conveying pipe (66) and the second exhaust gas conveying pipe, respectively. The pipeline (67) is transported to the mixed explosion-proof device (61) of the exhaust gas treatment unit (6), and then inert gas such as nitrogen is injected into the mixed explosion-proof device (61) through the third inert gas input pipeline (611), so as to be combined with the explosion-proof device (61). The organic gas is mixed, and the organic gas system mixed with the inert gas will be transported to the exhaust gas cracking module (62) through the gas transmission pipeline (65), and will pass the minimum explosion limit before being transported to the exhaust gas cracking module (62). The analyzer (69) detects its concentration to determine that the organic gas mixed with the inert gas will not explode, and then is sent to the tail gas cracking module (62), so that the temperature is about 1050° C. in the tail gas cracking module (62). The high temperature of the organic gas is decomposed into water vapor and carbon dioxide. Assuming that the organic gas contains components such as sulfur and halogen, the odor, etc., are removed by the additional exhaust gas reduction module (63), and then passed through the chimney (64). It is discharged into the atmosphere, and if it does not contain components such as sulfur and halogen, it is directly discharged into the atmosphere through the chimney (64) after being pyrolyzed by the exhaust gas cracking module (62).

It is worth mentioning that the present invention uses a first heat recovery pipe between the second fixed outer furnace (22) of the thermal desorption unit (2) and the first fixed outer furnace (12) of the drying unit (1). The road (25) is connected to supply the waste heat generated by the operation of the thermal desorption unit (2) to the drying unit (1) through the first heat recovery pipeline (25), and the drying unit (1) can be provided for soil drying. The required heat energy and the residual heat from the operation of the drying unit (1) can be transported to the soil pre-treatment unit (7) through the second heat recovery pipeline (72) for preheating the polluted soil. The soil pretreatment unit (7) can also conduct heat exchange with the first heat exchange unit (41) through the heat exchange pipeline (43) to maintain the heat source required for soil preheating, so the present invention only needs to be used for thermal desorption Unit (2) burns diesel fuel etc. Therefore, the drying unit (1) and the soil pre-processing unit (7) do not need to use fuel for heating, so as to effectively save energy. In addition, when the exhaust gas cracking module (62) of the present invention uses a regenerative incinerator to crack organic gas, the organic gas will generate high heat due to oxidation during the combustion process, and the heat will be generated by the regenerative incinerator. After the regenerative element is recovered, it is then supplied to the regenerative incinerator for heating, so as to reduce the amount of thermal energy and fuel required by the regenerative incinerator. Accordingly, the present invention can greatly reduce the energy consumption required for the operation of the overall system, thereby effectively reducing the benefits such as fuel costs.

The foregoing embodiments or drawings do not limit the implementation of the heat treatment system for soil pollution of the present invention, and any appropriate changes or modifications made by those with ordinary knowledge in the technical field should be considered as not departing from the scope of the present invention.

As can be seen from the above structure and implementation, the present invention has the following advantages:

1. The heat treatment system for soil pollution of the present invention supplies the waste heat generated by the operation of the thermal desorption unit to the drying unit and the soil pre-treatment unit in sequence through the heat recovery pipeline, so only fuel needs to be used in the thermal desorption unit. Heating, and no need to use fuel at the drying unit and the sewage pre-treatment unit, thereby saving the energy consumption of the overall system operation and effectively reducing the cost efficiency.

2. The heat treatment system for soil pollution of the present invention is provided with a tail gas treatment unit, so that the tail gas generated after the thermal desorption of the soil is decomposed into water vapor and carbon dioxide through the mixed explosion-proof device and the tail gas cracking module of the tail gas treatment unit. It is discharged into the atmosphere, so as to avoid secondary pollution caused by organic gases to the environment.

3. The heat treatment system for soil pollution of the present invention is provided with a dust removal unit and a heat exchange unit, so that the dust, water vapor and oil and gas caused by the drying and thermal desorption of the oily soil are removed by the dust removal unit, and then regenerated. After the heat exchange unit condenses the high-temperature water vapor and oil and gas into liquid, the waste water and mixed oil are separated by the oil-water separation unit for recycling and reuse.

To sum up, the embodiments of the present invention can indeed achieve the expected effects, and the specific structures disclosed have not only not been seen in similar products, but also have not been disclosed before the application. In accordance with the provisions and requirements of the Patent Law, it is truly grateful to file an application for an invention patent in accordance with the law.

1: Drying unit 11: The first inner rotary furnace 12: The first fixed outer furnace 13: The first inert gas input line 2: Thermal desorption unit 21: Second inner rotary furnace 22: Second fixed outer furnace 23: The first sewage conveying pipeline 24: Second inert gas input line 25: The first heat recovery line 3: Dust removal unit 31: The first dust removal unit 32: Second dust removal unit 33: The first dust collection pipeline 34: The second dust collection pipeline 35: The first conveying pipeline 36: Second delivery pipeline 4: heat exchange unit 41: The first heat exchange unit 42: Second heat exchange unit 43: Heat Exchange Line 44: The first condensation module 45: The first cooling line 46: Second condensing module 47: Second cooling line 5: Oil-water separation unit 51: The first oil-water separation unit 52: Second oil-water separation unit 53: The first waste liquid pipeline 54: Second waste liquid pipeline 6: Exhaust gas treatment unit 61: Hybrid explosion-proof device 611: Third inert gas input line 62: Exhaust gas cracking module 63: Exhaust gas reduction module 64: Chimney 65: Gas pipeline 66: The first exhaust gas delivery pipeline 67: Second exhaust gas delivery pipeline 68: Extraction module 69: Minimum Explosive Limit Analyzer 7: The first sewage pretreatment unit 71: Second sewage conveying pipeline 72: Second heat recovery line 8: Soil treatment unit to be tested 81: The third sewage conveying pipeline

Claims (8)

A heat treatment system for soil pollution, comprising: a drying unit, so that the drying unit is formed with a first sewage input end and a first sewage output end opposite, and the drying unit is connected to the first sewage The same side of the output end is provided with a first dust discharge end, and the drying unit is provided with a first waste heat receiving end; a heat desorption unit is formed with a second dirt input end opposite to the heat desorption unit and A second sewage output end, and the first sewage output end of the drying unit and the second sewage input end of the thermal desorption unit are connected by a first sewage conveying pipeline, and the heat The desorption unit is provided with a second dust discharge end on the same side of the second dirt output end, and the thermal desorption unit is provided with a first waste heat output end, so as to be connected with the first waste heat receiving end of the drying unit by a The first heat recovery pipeline is connected; the two dedusting units include a first dedusting unit and a second dedusting unit, so that the first dedusting unit is formed with a first input end and a first output end opposite to each other, The first input end of the first dust removal unit and the first dust discharge end of the drying unit are connected by a first dust collection pipeline, and the second dust removal unit is formed with an opposite second input end and a second output end, and the second input end of the second dust removal unit and the second dust discharge end of the thermal desorption unit are connected by a second dust collection pipeline; two heat exchange units, including A first heat exchange unit and a second heat exchange unit, so that the first heat exchange unit is provided with a first introduction end, so as to be connected with the first output end of the first dust removal unit through a first conveying pipeline In addition, the second heat exchange unit is provided with a second inlet end to be connected with the second output end of the second dust removal unit by a second conveying pipeline, and the first heat exchange unit is connected to a The first condensing modules are connected by a first cooling pipeline, and the second heat exchange unit and a second condensing module are connected by a second The cooling pipes are connected, and the first heat exchange unit and the second heat exchange unit are respectively provided with a first exhaust gas output end and a second exhaust gas output end; a sewage pretreatment unit is used to preprocess the sewage The unit and the first sewage input end of the drying unit are connected by a second sewage conveying pipeline, and the sewage pretreatment unit is provided with a second waste heat receiving end, and the drying unit is provided with a second The waste heat output end is connected with a second heat recovery pipeline between the second waste heat receiving end of the soil pre-treatment unit and the second waste heat output end of the drying unit, and the soil pre-treatment unit is connected with the second waste heat output end. A heat exchange unit is connected by a heat exchange pipeline; a second oil-water separation unit includes a first oil-water separation unit and a second oil-water separation unit, so that the first heat exchange unit is provided with a first waste liquid output A first waste liquid pipeline is connected with the input end of the first oil-water separation unit, and the second heat exchange unit is provided with a second waste liquid output end to connect with the second oil-water separation unit The input ends are connected by a second waste liquid pipeline; an exhaust gas treatment unit is connected with a first exhaust gas conveying pipeline between the first exhaust gas output end of the first heat exchange unit and the exhaust gas treatment unit In addition, the second exhaust gas output end of the second heat exchange unit and the exhaust gas processing unit are connected by a second exhaust gas conveying pipeline. The heat treatment system for soil pollution according to claim 1, wherein the drying unit is an indirect heating rotary furnace, which mainly includes a first inner rotary furnace and a first fixed outer furnace covering the first inner rotary furnace , and make the first inner rotary furnace of the drying unit form the first dirt input end and the first dirt output end respectively, and make the first inner rotary furnace on the same side of its first dirt output end The first dust discharge end is provided, and the first stationary outer furnace is provided with its first waste heat receiving end. In addition, the thermal desorption unit is an indirect heating rotary furnace, which mainly includes a second inner rotary furnace and a second inner rotary furnace. The second fixed outer furnace covering the second inner rotating furnace is to allow the thermal desorption unit to The opposite ends of the second inner rotary furnace respectively form the second dirt input end and the second dirt output end, and the second inner rotary furnace is provided with its second dust discharge end on the same side of the second dirt output end. The second fixed outer furnace is provided with its first waste heat output end. The heat treatment system for soil pollution according to claim 2, wherein the heating temperature of the first inner rotary furnace of the drying unit is set to 100-200°C, and the heating temperature of the first fixed outer furnace is set to 250-250°C 800°C, the heating temperature of the second inner rotary furnace of the thermal desorption unit is set to 450-900°C, and the heating temperature of the second fixed outer furnace is set to 600-1050°C. The heat treatment system for soil pollution according to claim 1, wherein the exhaust gas treatment unit comprises a mixed explosion-proof device, an exhaust gas cracking module and a chimney, and the mixing explosion-proof device, the exhaust gas cracking module and the chimney are separated from each other. Connect a gas transmission pipeline in sequence, and connect the first exhaust gas output end of the first heat exchange unit and the hybrid explosion-proof device with the first exhaust gas transmission pipeline, and make the first exhaust gas transmission pipeline of the second heat exchange unit. The two exhaust gas output ends are connected with the mixed explosion-proof device by the second exhaust gas conveying pipeline, and the mixed explosion-proof device is connected with a third inert gas input pipeline. The heat treatment system for soil pollution according to claim 4, wherein the exhaust gas treatment unit further comprises an exhaust gas reduction module, so that the exhaust gas reduction module is arranged between the exhaust gas cracking module and the chimney, and is connected with the exhaust gas The cracking module and the chimney are respectively connected with a gas pipeline. The heat treatment system for soil contamination according to claim 4, wherein the mixed explosion-proof device of the exhaust gas treatment unit and the exhaust gas cracking module are connected with a gas pipeline with a minimum explosion limit analyzer. The thermal treatment system for soil pollution according to claim 4, wherein the exhaust gas cracking module of the exhaust gas treatment unit is a direct-fired incinerator or a regenerative incinerator. The heat treatment system for soil pollution as claimed in claim 1, wherein the drying unit is connected to a first inert gas input pipeline on the same side of the first sewage input end, and the thermal desorption unit is connected to the second A second inert gas input pipeline is connected to the same side of the sewage input end.

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