CA3090902A1 - An environmentally friendly remediation method and system combined with soil washing and thermal desorption for treating high-concentration oil sludge - Google Patents
An environmentally friendly remediation method and system combined with soil washing and thermal desorption for treating high-concentration oil sludge Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 162
- 238000003795 desorption Methods 0.000 title claims abstract description 125
- 238000005406 washing Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002689 soil Substances 0.000 title claims description 16
- 238000005067 remediation Methods 0.000 title claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 85
- 239000007789 gas Substances 0.000 claims abstract description 66
- 239000000126 substance Substances 0.000 claims abstract description 64
- 238000002485 combustion reaction Methods 0.000 claims abstract description 57
- 239000007788 liquid Substances 0.000 claims abstract description 47
- 230000003647 oxidation Effects 0.000 claims abstract description 46
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 46
- 238000011084 recovery Methods 0.000 claims abstract description 45
- 239000002918 waste heat Substances 0.000 claims abstract description 36
- 238000003860 storage Methods 0.000 claims abstract description 28
- 239000010865 sewage Substances 0.000 claims abstract description 27
- 239000000428 dust Substances 0.000 claims abstract description 23
- 238000001816 cooling Methods 0.000 claims abstract description 18
- 238000000926 separation method Methods 0.000 claims abstract description 14
- 238000000265 homogenisation Methods 0.000 claims abstract description 10
- 238000009833 condensation Methods 0.000 claims abstract description 6
- 230000005494 condensation Effects 0.000 claims abstract description 6
- 239000003921 oil Substances 0.000 claims description 140
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 23
- 239000003546 flue gas Substances 0.000 claims description 23
- 238000010791 quenching Methods 0.000 claims description 13
- 239000010779 crude oil Substances 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 10
- 229910001220 stainless steel Inorganic materials 0.000 claims description 10
- 239000010935 stainless steel Substances 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 230000003750 conditioning effect Effects 0.000 claims description 7
- 238000012545 processing Methods 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 6
- 150000002013 dioxins Chemical class 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000000498 cooling water Substances 0.000 claims description 4
- 239000010813 municipal solid waste Substances 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000007790 solid phase Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 4
- 239000003345 natural gas Substances 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 2
- 230000002950 deficient Effects 0.000 claims description 2
- 238000010410 dusting Methods 0.000 claims description 2
- 230000008030 elimination Effects 0.000 claims description 2
- 238000003379 elimination reaction Methods 0.000 claims description 2
- 239000002002 slurry Substances 0.000 claims description 2
- 239000003208 petroleum Substances 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000005202 decontamination Methods 0.000 abstract 3
- 230000003588 decontaminative effect Effects 0.000 abstract 3
- 206010037660 Pyrexia Diseases 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- KVGZZAHHUNAVKZ-UHFFFAOYSA-N 1,4-Dioxin Chemical compound O1C=COC=C1 KVGZZAHHUNAVKZ-UHFFFAOYSA-N 0.000 description 5
- 229930195733 hydrocarbon Natural products 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 5
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002270 dispersing agent Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000005273 aeration Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 231100000219 mutagenic Toxicity 0.000 description 1
- 230000003505 mutagenic effect Effects 0.000 description 1
- 239000003027 oil sand Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 231100000378 teratogenic Toxicity 0.000 description 1
- 230000003390 teratogenic effect Effects 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/38—Removing components of undefined structure
- B01D53/40—Acidic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Treatment Of Sludge (AREA)
- Treating Waste Gases (AREA)
Abstract
Disclosed are a green cleaning-thermal desorption integrated technology treatment method and system for high-concen-tration petroleum sludge The method compnses the treatment steps of homogeneous impunty removal pretreatment, chemical thermal washing treatment, solid-liquid separation and petroleum-water separation, petroleum sludge thermal desorption and high-temperature combustion and oxidation, heat exchange and tail gas cooling and dust removal The system comprises a petroleum sludge chemical thermal washing system and a petroleum sludge decontamination thermal desorption system. The petroleum sludge chemical thermal washing system is formed by connecting a petroleum sludge homogenization tank (1), a petroleum sludge chemical thermal washing tank (2), a high-efficiency solid-liquid separator (3), an petroleum-water separator (4), a sewage integrated treatment system (6) and a water storage tank (23) successively The petroleum sludge decontamination thermal desorption system mainly consists of a sludge dryer (10), a condensation recoveiy system (11), a thermal desorption feeding system (7), a thermal desorption system (8), a high-tem-perature combustion and oxidation system (9), a waste heat boiler (13) and a discharging system. Due to the combined application of the chemical thermal washing technology and the thermal desorption technology, multiple functions, such as resource recovery and uti-lization of petroleum matenals and heat, reduction and decontamination treatment of petroleum sludge, can be simultaneously realized.
Description
Des cription AN ENVIRONMENTALLY FRIENDLY REMEDIATION METHOD AND
SYSTEM COMBINED WITH SOIL WASHING AND THERMAL DESORPTION FOR
TREATING HIGH-CONCENTRATION OIL SLUDGE
Technical Field The present disclosure relates to the technical field of treating oil sludge, and more specifically to methods and systems for treating high-concentration oil sludge from an environmentally friendly remediation method and system combined with soil washing and thermal desorption.
B ackground Art Oil is a chemical energy. During mining, transportation, storage and processing for oil, a large amount of waste residue, waste water and waste gas are inevitably produced, which poses a huge potential threat to the environment and human security. In particular, high-concentration oil sludge contains a large amount of odorous toxic substances such as benzene, hydrazine, phenols, and hydrazine. If the oil sludge is not treated in time, it will cause pollution in production area and surrounding environment. The volatilization of volatile compounds in oil sludge may cause the total hydrocarbon concentration to exceed the standard in the production area. The scattered and piled oil sludge will influence the surface water and even the groundwater, then COD, BOD, and total petroleum hydrocarbons in the water may exceed the standard. High concentration of crude oil in the oil sludge can result in exceeded total petroleum hydrocarbon in the soil, compacted soil, destroyed vegetation, degraded grassland, and influenced ecological environment. Because some hydrocarbon components in crude oil are carcinogenic, teratogenic, and mutagenic, oil sludge in oil fields has been classified as hazardous solid waste (HWO8) for management.
Generally, the oil sludge with oil content greater than 15% is called high-concentration oil sludge. At present, thermal chemical washing is normally used to treat high-concentration Date Recue/Date Received 2020-08-11 oil sludge for crude oil recovery. But if only applying the thermal chemical washing method, the residual high oil content in the treated oil sludge still does not meet the criteria for direct emissions or utili7ation. If direct-heating thermal desorption is used to treat heavy oil sludge, there are serious potential safety risks, and disadvantages such as high energy consumption and waste of petroleum resources.
Summary To overcome shortcomings of the prior art, the present disclosure provides an environmentally friendly remediation method and system combined with soil washing and thermal desorption to treat high-concentration sludge. Certain methods and systems of this invention disclose an innocuous approach for resource utili7ation of oil sludge.
In order to achieve the above objectives, this disclosure includes the following steps:
(1) Pretreatment for homogenization and impurity removal: conditioning and dispersing the oil sludge, and removing rubbish and sundries in the slurry.
SYSTEM COMBINED WITH SOIL WASHING AND THERMAL DESORPTION FOR
TREATING HIGH-CONCENTRATION OIL SLUDGE
Technical Field The present disclosure relates to the technical field of treating oil sludge, and more specifically to methods and systems for treating high-concentration oil sludge from an environmentally friendly remediation method and system combined with soil washing and thermal desorption.
B ackground Art Oil is a chemical energy. During mining, transportation, storage and processing for oil, a large amount of waste residue, waste water and waste gas are inevitably produced, which poses a huge potential threat to the environment and human security. In particular, high-concentration oil sludge contains a large amount of odorous toxic substances such as benzene, hydrazine, phenols, and hydrazine. If the oil sludge is not treated in time, it will cause pollution in production area and surrounding environment. The volatilization of volatile compounds in oil sludge may cause the total hydrocarbon concentration to exceed the standard in the production area. The scattered and piled oil sludge will influence the surface water and even the groundwater, then COD, BOD, and total petroleum hydrocarbons in the water may exceed the standard. High concentration of crude oil in the oil sludge can result in exceeded total petroleum hydrocarbon in the soil, compacted soil, destroyed vegetation, degraded grassland, and influenced ecological environment. Because some hydrocarbon components in crude oil are carcinogenic, teratogenic, and mutagenic, oil sludge in oil fields has been classified as hazardous solid waste (HWO8) for management.
Generally, the oil sludge with oil content greater than 15% is called high-concentration oil sludge. At present, thermal chemical washing is normally used to treat high-concentration Date Recue/Date Received 2020-08-11 oil sludge for crude oil recovery. But if only applying the thermal chemical washing method, the residual high oil content in the treated oil sludge still does not meet the criteria for direct emissions or utili7ation. If direct-heating thermal desorption is used to treat heavy oil sludge, there are serious potential safety risks, and disadvantages such as high energy consumption and waste of petroleum resources.
Summary To overcome shortcomings of the prior art, the present disclosure provides an environmentally friendly remediation method and system combined with soil washing and thermal desorption to treat high-concentration sludge. Certain methods and systems of this invention disclose an innocuous approach for resource utili7ation of oil sludge.
In order to achieve the above objectives, this disclosure includes the following steps:
(1) Pretreatment for homogenization and impurity removal: conditioning and dispersing the oil sludge, and removing rubbish and sundries in the slurry.
(2) Thermal chemical washing treatment: the sludge after homogenization and impurity removal is sent to thermal chemical washing tank containing hot water and washing agent, then stirring separates the crude oil from the oil sludge, and the crude oil in the top of the thermal chemical washing tank is scraped out and stored in a recycle oil tank.
The solid phase after thermal chemical washing is discharged from the bottom of the tank into the high-efficiency solid-liquid separator.
The solid phase after thermal chemical washing is discharged from the bottom of the tank into the high-efficiency solid-liquid separator.
(3) Solid-liquid separation and oil-water separation: solid-liquid separation is conducted by high-efficiency solid-liquid separator. The oil content of the treated oil sludge is reduced to 3%-6%, and the water content is to 60%-70%. Then the oil sludge is transported to temporary storage area, or directly sent to the sludge dryer. The sewage separated by the high-efficiency solid-liquid separator is sent to the oil-water separator, and the oil separated by the oil-water separator is sent to the oil recovery tank. The sewage separated by the oil-water separator is sent to the integrated treatment system for sewage treatment, then the treated water is stored Date Recue/Date Received 2020-08-11 in the water storage tank and recycled for thermal chemical washing tank.
(4) Oil sludge drying and condensing recovery treatment: the oil sludge sent to the sludge dryer is dried to a moisture content of less than 20%, and the steam generated during the drying process is sent to a condensate recovery system for condensation.
Condensed oil and water in the condensate after condensation are sent to the oil-water separator for oil-water separation.
Condensed oil and water in the condensate after condensation are sent to the oil-water separator for oil-water separation.
(5) Thermal desorption treatment and high-temperature combustion oxidation treatment for oil sludge: the oil sludge treated by the sludge dryer is sent to the thermal desorption system, and the temperature of the thermal desorption chamber which must have a micro-negative pressure is controlled at 300 C -750 C. Meanwhile, the direction of oil sludge transportation need to opposite to the direction of flue gas flow, and make sure that the sludge is desorbed and decomposed under oxygen-deficient condition.
(6) Heat exchange treatment: the flue gas generated in the thermal desorption system in the step (5) and the non-condensable light component produced in the condensate recovery system in the step (4) are sent to the high-temperature combustion oxidation system for complete combustion oxidation. The high-temperature exhaust gas from the high-temperature combustion oxidation system is sent to the waste heat boiler for waste heat recycle, and the generated superheated steam is used as a heat source for the thermal chemical washing tank and the sludge dryer.
(7) Cooling and dust removal treatment for exhaust gas: the medium-temperature tail gas from the waste heat boiler is sent to the quench tower. The temperature of tail gas is reduced to below 200 C through the quench tower, then the acid gas is removed by cooling, dusting, and spraying the alkali liquid. The treated tail gas met the standard is discharged into the atmosphere through the chimney.
In the step (6), the high-temperature combustion oxidation system is fired by an open flame of natural gas. The working temperature is in the range of 850 C-1100 C, and the Date Recue/Date Received 2020-08-11 residence time is 1.5 s- 2.0 s to ensure complete elimination of the organic components to prevent dioxin production.
In the step (6), the high-temperature exhaust gas produced from the high-temperature combustion oxidation system is about 1000 C, which is then lowered to a medium-temperature exhaust gas of 500 C after being sent to a waste heat boiler for waste heat recycle.
The invention relates to an environmentally friendly method and system combined with soil washing and thermal desorption for high-concentration oil sludge, which is mainly composed of a thermal chemical washing system and a thermal desorption system.
The thermal chemical washing system is composed of oil sludge homogenizing tank 1, thermal chemical washing tank 2, high-efficiency solid-liquid separator 3, oil-water separator 4, integrated treatment system for sewage treatment 6, and water storage tank 23 sequentially connected by pipelines. The top oil outlet of the thermal chemical washing tank 2 and the oil outlet of the oil-water separator 4 are respectively connected to the oil recovery tank 5. The bottom of the thermal chemical washing tank 2 is connected to the high-efficiency solid-liquid separator 3, and the liquid outlet of the high-efficiency solid-liquid separator 3 is connect with oil-water separator 4. The thermal desorption system comprises an sludge dryer 10, a condensate recovery system 11, thermal desorption feeding system 7, a thermal desorption system 8, a high-temperature combustion oxidation system 9, a waste heat boiler 13, cooling and dust removal treatment system for exhaust gas, and a discharge system. The solid discharge port of the high efficiency solid-liquid separator 3 is connected with the feed port of the sludge dryer 10, and the steam outlet of sludge dryer 10 is connected with condensate recovery system 11. The non-condensable gas outlet of the condensate recovery system 11 is connected to the high-temperature combustion oxidation system 9. The condensate outlet of the condensate recovery system 11 is connected to the oil-water separator 4.
The solid discharge port of the sludge dryer 10 is connected with the thermal desorption feeding system Date Recue/Date Received 2020-08-11 7, and the thermal desorption feed system 7 is connected to the thermal desorption system 8.
The thermal desorption flue gas outlet 83 of the thermal desorption system 8 is connected to the flue gas inlet 91 of the high-temperature combustion oxidation system 9.
The discharge port of the thermal desorption system 8 is connected to the discharge system, and the exhaust gas outlet 93 of the high-temperature combustion oxidation system 9 is connected to the waste heat boiler 13. The steam outlet of the waste heat boiler 13 is connected to the thermal chemical washing tank 2 and the sludge dryer 10. The tail gas outlet of the waste heat boiler is connected with the cooling and dust removal system for exhaust gas. The tail gas is discharged to the atmosphere after being treated by the cooling and dust removal treatment system.
The oil-water separator 4 of this disclosure is composed of a buffer tank 41, a reaction tank 42, an oil storage tank 44, and a water discharge tank 43. The buffer tank 41, the reaction tank 42, and the water discharge tank 43 are arranged in order. The oil storage tank 44 is located on the top of the reaction tank 42. The oil storage tank 44 is connected to the oil recovery tank 5, and the buffer tank 41 is connected to the liquid outlet of the high-efficiency solid-liquid separator 3.
The thermal desorption feeding system 7 of this disclosure is composed of a feed silo 71, a belt conveyor 72 and a metering feed hopper 73. The feed silo 71 is at the inlet of the belt conveyor 72, and the metering feed hopper 73 is at the outlet of the belt conveyor 72. The outlet of the metering feed hopper 73 is connected with the inlet of the thermal desorption system 8.
The thermal desorption system 8 of this disclosure comprises a refractory-coated thermal desorption chamber, a series of thermal desorption burners 82 mounted on top of the thermal desorption chamber, and a stainless steel crawler conveyor belt 81 below the thermal desorption burner 82. The thermal desorption chamber has a feeding inlet at one end, a discharge propeller 84 at the other end, and a thermal desorption flue gas outlet 83 at the top.
Date Recue/Date Received 2020-08-11 The high-temperature combustion oxidation system 9 of this invention comprises a high-temperature combustion chamber. One end of the high-temperature combustion chamber is set with a flue gas inlet 91 and a high-temperature burner 92, and the other end is provided with a exhaust gas outlet 93 which is connected to the waste heat boiler 13.
The cooling and dust removal treatment system for exhaust gas of this invention comprises a quench tower 14, a spray tower 15, a settling tower 16, an induced draft fan 17, and a chimney 18. The spray tower 15 is connected with the settling tower 16, and the quench tower 14 is connected to the spray tower15. The outlet of the settling tower 16 is connected to the chimney 18 with a pipe with the induced draft fan 17 mounted on.
The discharge system of this disclosure is composed of a discharge hopper 19, a double helix discharge machine 20, and a discharge silo 21. The discharge hopper 19 is located at the inlet of the double helix discharge machine 20, and the discharge silo 21 is located at the outlet of the double helix discharge machine 20. The outer layer of the double helix discharge machine 20 is wrapped with a layer of cooling water. The top of the discharge silo 21 set a spraying device to reduce the temperature and dust of the dregs in the silo.
Compared with the prior art, this invention has the following advantages:
(1) The washing agent used in the invention is environmentally friendly, and the washing effect is remarkable. After being washed, the oil-water-solid three phase stratified efficiency is fast, and the oil recovery rate is high.
(2) The thermal desorption system of the invention adopts heat-resistant and anti-corrosion stainless steel crawler conveyor belt for transmission, and direct heat for heating oil sludge. The thermal desorption system with high operating temperature and residence time, has high desorption efficiency and large processing capacity.
(3) The whole system of the invention is kept under the condition of micro-negative pressure. Normally, it can ensure that pollutants and dust do not overflow and prevent secondary pollution.
Date Recue/Date Received 2020-08-11 (4) The high-temperature combustion chamber has enough length, sufficient residence time, excess air added, and highly enough combustion temperature, to achieve 3T incineration and ensure complete combustion of the organic gas to effectively prevent the generation of dioxins.
(5) Recycling the waste heat of the entire system saves energy and reduces energy consumption costs.
(6) The combination of thermal chemical washing technology and thermal desorption technology can achieve multiple functions of recycling petroleum resources and heat, and oil minimization and innocent treatment, simultaneously.
Brie fDes cription ofDrawings FIG 1 is a logic diagram of an environmentally friendly remediation system combined with soil washing and thermal desorption for treating high-concentration oil sludge.
FIG 2 is a schematic process flow diagram of an environmentally friendly remediation system combined with soil washing and thermal desorption for treating high-concentration oil sludge.
In the appended drawings of FIGS: oil sludge homogenizing tank 1, thermal chemical washing tank 2, high efficiency solid-liquid separator 3, oil-water separator 4, sewage buffer tank 41, reaction tank 42, oil storage tank 44, water discharge tank 43, oil recovery tank 5, integrated treatment system for sewage treatment 6, thermal desorption feeding system 7, feed silo 71, belt conveyor 72, metering feed hopper 73, thermal desorption system
In the step (6), the high-temperature combustion oxidation system is fired by an open flame of natural gas. The working temperature is in the range of 850 C-1100 C, and the Date Recue/Date Received 2020-08-11 residence time is 1.5 s- 2.0 s to ensure complete elimination of the organic components to prevent dioxin production.
In the step (6), the high-temperature exhaust gas produced from the high-temperature combustion oxidation system is about 1000 C, which is then lowered to a medium-temperature exhaust gas of 500 C after being sent to a waste heat boiler for waste heat recycle.
The invention relates to an environmentally friendly method and system combined with soil washing and thermal desorption for high-concentration oil sludge, which is mainly composed of a thermal chemical washing system and a thermal desorption system.
The thermal chemical washing system is composed of oil sludge homogenizing tank 1, thermal chemical washing tank 2, high-efficiency solid-liquid separator 3, oil-water separator 4, integrated treatment system for sewage treatment 6, and water storage tank 23 sequentially connected by pipelines. The top oil outlet of the thermal chemical washing tank 2 and the oil outlet of the oil-water separator 4 are respectively connected to the oil recovery tank 5. The bottom of the thermal chemical washing tank 2 is connected to the high-efficiency solid-liquid separator 3, and the liquid outlet of the high-efficiency solid-liquid separator 3 is connect with oil-water separator 4. The thermal desorption system comprises an sludge dryer 10, a condensate recovery system 11, thermal desorption feeding system 7, a thermal desorption system 8, a high-temperature combustion oxidation system 9, a waste heat boiler 13, cooling and dust removal treatment system for exhaust gas, and a discharge system. The solid discharge port of the high efficiency solid-liquid separator 3 is connected with the feed port of the sludge dryer 10, and the steam outlet of sludge dryer 10 is connected with condensate recovery system 11. The non-condensable gas outlet of the condensate recovery system 11 is connected to the high-temperature combustion oxidation system 9. The condensate outlet of the condensate recovery system 11 is connected to the oil-water separator 4.
The solid discharge port of the sludge dryer 10 is connected with the thermal desorption feeding system Date Recue/Date Received 2020-08-11 7, and the thermal desorption feed system 7 is connected to the thermal desorption system 8.
The thermal desorption flue gas outlet 83 of the thermal desorption system 8 is connected to the flue gas inlet 91 of the high-temperature combustion oxidation system 9.
The discharge port of the thermal desorption system 8 is connected to the discharge system, and the exhaust gas outlet 93 of the high-temperature combustion oxidation system 9 is connected to the waste heat boiler 13. The steam outlet of the waste heat boiler 13 is connected to the thermal chemical washing tank 2 and the sludge dryer 10. The tail gas outlet of the waste heat boiler is connected with the cooling and dust removal system for exhaust gas. The tail gas is discharged to the atmosphere after being treated by the cooling and dust removal treatment system.
The oil-water separator 4 of this disclosure is composed of a buffer tank 41, a reaction tank 42, an oil storage tank 44, and a water discharge tank 43. The buffer tank 41, the reaction tank 42, and the water discharge tank 43 are arranged in order. The oil storage tank 44 is located on the top of the reaction tank 42. The oil storage tank 44 is connected to the oil recovery tank 5, and the buffer tank 41 is connected to the liquid outlet of the high-efficiency solid-liquid separator 3.
The thermal desorption feeding system 7 of this disclosure is composed of a feed silo 71, a belt conveyor 72 and a metering feed hopper 73. The feed silo 71 is at the inlet of the belt conveyor 72, and the metering feed hopper 73 is at the outlet of the belt conveyor 72. The outlet of the metering feed hopper 73 is connected with the inlet of the thermal desorption system 8.
The thermal desorption system 8 of this disclosure comprises a refractory-coated thermal desorption chamber, a series of thermal desorption burners 82 mounted on top of the thermal desorption chamber, and a stainless steel crawler conveyor belt 81 below the thermal desorption burner 82. The thermal desorption chamber has a feeding inlet at one end, a discharge propeller 84 at the other end, and a thermal desorption flue gas outlet 83 at the top.
Date Recue/Date Received 2020-08-11 The high-temperature combustion oxidation system 9 of this invention comprises a high-temperature combustion chamber. One end of the high-temperature combustion chamber is set with a flue gas inlet 91 and a high-temperature burner 92, and the other end is provided with a exhaust gas outlet 93 which is connected to the waste heat boiler 13.
The cooling and dust removal treatment system for exhaust gas of this invention comprises a quench tower 14, a spray tower 15, a settling tower 16, an induced draft fan 17, and a chimney 18. The spray tower 15 is connected with the settling tower 16, and the quench tower 14 is connected to the spray tower15. The outlet of the settling tower 16 is connected to the chimney 18 with a pipe with the induced draft fan 17 mounted on.
The discharge system of this disclosure is composed of a discharge hopper 19, a double helix discharge machine 20, and a discharge silo 21. The discharge hopper 19 is located at the inlet of the double helix discharge machine 20, and the discharge silo 21 is located at the outlet of the double helix discharge machine 20. The outer layer of the double helix discharge machine 20 is wrapped with a layer of cooling water. The top of the discharge silo 21 set a spraying device to reduce the temperature and dust of the dregs in the silo.
Compared with the prior art, this invention has the following advantages:
(1) The washing agent used in the invention is environmentally friendly, and the washing effect is remarkable. After being washed, the oil-water-solid three phase stratified efficiency is fast, and the oil recovery rate is high.
(2) The thermal desorption system of the invention adopts heat-resistant and anti-corrosion stainless steel crawler conveyor belt for transmission, and direct heat for heating oil sludge. The thermal desorption system with high operating temperature and residence time, has high desorption efficiency and large processing capacity.
(3) The whole system of the invention is kept under the condition of micro-negative pressure. Normally, it can ensure that pollutants and dust do not overflow and prevent secondary pollution.
Date Recue/Date Received 2020-08-11 (4) The high-temperature combustion chamber has enough length, sufficient residence time, excess air added, and highly enough combustion temperature, to achieve 3T incineration and ensure complete combustion of the organic gas to effectively prevent the generation of dioxins.
(5) Recycling the waste heat of the entire system saves energy and reduces energy consumption costs.
(6) The combination of thermal chemical washing technology and thermal desorption technology can achieve multiple functions of recycling petroleum resources and heat, and oil minimization and innocent treatment, simultaneously.
Brie fDes cription ofDrawings FIG 1 is a logic diagram of an environmentally friendly remediation system combined with soil washing and thermal desorption for treating high-concentration oil sludge.
FIG 2 is a schematic process flow diagram of an environmentally friendly remediation system combined with soil washing and thermal desorption for treating high-concentration oil sludge.
In the appended drawings of FIGS: oil sludge homogenizing tank 1, thermal chemical washing tank 2, high efficiency solid-liquid separator 3, oil-water separator 4, sewage buffer tank 41, reaction tank 42, oil storage tank 44, water discharge tank 43, oil recovery tank 5, integrated treatment system for sewage treatment 6, thermal desorption feeding system 7, feed silo 71, belt conveyor 72, metering feed hopper 73, thermal desorption system
8, stainless steel crawler conveyor belt 81, thermal desorption burner 82, thermal desorption flue gas outlet 83, discharge propeller 84, high-temperature combustion oxidation system 9, flue gas inlet 91, high-temperature burner 92, exhaust gas outlet 93, sludge dryer 10, condensate recovery system 11, condensate pump 12, waste heat boiler 13, quench tower 14, spray tower 15, settling tower 16, induced draft fan 17, chimney 18, discharge hopper 19, double helix discharge machine 20, discharge silo 21, dosing system 22, water storage tank 23 The first Date Recue/Date Received 2020-08-11 sludge pump 24, the second sludge pump 25, the sewage pump 26, and the bar screen 27.
Detailed Description In the following description, numerous details are provided for an understanding of this invention with attached drawings.
As shown in the FIG 1, an environmentally friendly remediation system combined with soil washing and thermal desorption to treat high-concentration soil sludge of this invention comprises the following processing steps:
(1) Pretreatment for homogenization and impurity removal: the sludge is tempered and dispersed during the pretreatment. In the process of conditioning, dispersant can be added to adjust the dispersibility of the oil sludge. The rubbish and sundries (fragments of color-strip woven bag, labour protection appliance, weeds, bricks, wires) which are larger than 10 mm are intercepted by the grille, and the debris intercepted by the grille is regularly cleaned.
(2) Thermal chemical washing treatment: the sludge after homogenization and impurity removal is sent into a thermal chemical washing tank containing hot water (60 C -80 C) and washing agent (such as lye, surfactant). The thermal chemical washing tank is equipped with a dosing system for adding washing agent. The green washing agent, hot water, and the oil sludge are forcibly stirred by the stirring paddle in the tank, so that the crude oil is separated from the sludge. The separated oil in the top of the thermal chemical washing tank is scraped out and stored in an oil recovery tank. The solid phase after the thermal chemical washing is discharged from the bottom of the thermal chemical washing tank to the high-efficiency solid-liquid separator.
(3) Solid-liquid separation and oil-water separation: solid-liquid separation is conducted by high-efficiency solid-liquid separator. The oil content of the separated sludge is reduced to 3%-6%, and the water content is 60%-70%. A small dump truck transfers separated sludge to the temporary storage area or directly to the sludge dryer for oil sludge. The sewage separated by the high-efficiency solid-liquid separator is sent to the oil-water separator, and the oil Date Recue/Date Received 2020-08-11 separated by the oil-water separator is sent into the oil recovery tank. Then the sewage separated by the oil-water separator is sent to the integrated treatment system for sewage treatment (the structure of this equipment can use the equipment named "complete processing equipment for heavy metal wastewater" disclosed by Chinese Patent No.
ZL201220225085. X, and other appropriate sewage treatment equipment). The treated water is stored in a water storage tank and recycled for thermal chemical washing tank.
(4) Oil sludge drying and condensing recovery treatment: The moisture content for sludge after dewatering is about 60%, and this kind of sludge cannot directly enter the thermal desorption system. Therefore, the moisture content for sludge should be reduced to below 20% in the sludge dryer. The heat source of the sludge dryer mainly comes from the heat recovered by the electric and waste heat boilers. The steam generated during the drying process is sent to the condensate recovery system for condensation. After the oil and water are condensed, the condensate is sent to the oil-water separator for oil-water separation. The recovered oil is collected and transported to the treatment station for further treatment. The separated water enters the integrated treatment system for sewage treatment, then is reused for the thermal chemical washing tank for the oil sludge. The non-condensable light component (non-condensable gas) is transported to the high-temperature combustion oxidation system for complete combustion oxidation to ensure that the flue gas is fully purified.
(5) Thermal desorption treatment and high-temperature combustion oxidation treatment for oil sludge: the oil sludge treated by the sludge dryer is sent to the thermal desorption system through the feeding system, and the continuous feeding of the sludge makes the feed port form a "soil stopper". This stopper can reduce the amount of air entering the thermal desorption system, effectively block the thermal desorption system from the atmosphere, and ensure that the thermal desorption chamber is kept at a state of micro-negative pressure. The sludge is transported through the stainless steel track in the thermal desorption chamber. The flow of oil sludge transportation is opposite to the direction of the flue gas flow. During the
Detailed Description In the following description, numerous details are provided for an understanding of this invention with attached drawings.
As shown in the FIG 1, an environmentally friendly remediation system combined with soil washing and thermal desorption to treat high-concentration soil sludge of this invention comprises the following processing steps:
(1) Pretreatment for homogenization and impurity removal: the sludge is tempered and dispersed during the pretreatment. In the process of conditioning, dispersant can be added to adjust the dispersibility of the oil sludge. The rubbish and sundries (fragments of color-strip woven bag, labour protection appliance, weeds, bricks, wires) which are larger than 10 mm are intercepted by the grille, and the debris intercepted by the grille is regularly cleaned.
(2) Thermal chemical washing treatment: the sludge after homogenization and impurity removal is sent into a thermal chemical washing tank containing hot water (60 C -80 C) and washing agent (such as lye, surfactant). The thermal chemical washing tank is equipped with a dosing system for adding washing agent. The green washing agent, hot water, and the oil sludge are forcibly stirred by the stirring paddle in the tank, so that the crude oil is separated from the sludge. The separated oil in the top of the thermal chemical washing tank is scraped out and stored in an oil recovery tank. The solid phase after the thermal chemical washing is discharged from the bottom of the thermal chemical washing tank to the high-efficiency solid-liquid separator.
(3) Solid-liquid separation and oil-water separation: solid-liquid separation is conducted by high-efficiency solid-liquid separator. The oil content of the separated sludge is reduced to 3%-6%, and the water content is 60%-70%. A small dump truck transfers separated sludge to the temporary storage area or directly to the sludge dryer for oil sludge. The sewage separated by the high-efficiency solid-liquid separator is sent to the oil-water separator, and the oil Date Recue/Date Received 2020-08-11 separated by the oil-water separator is sent into the oil recovery tank. Then the sewage separated by the oil-water separator is sent to the integrated treatment system for sewage treatment (the structure of this equipment can use the equipment named "complete processing equipment for heavy metal wastewater" disclosed by Chinese Patent No.
ZL201220225085. X, and other appropriate sewage treatment equipment). The treated water is stored in a water storage tank and recycled for thermal chemical washing tank.
(4) Oil sludge drying and condensing recovery treatment: The moisture content for sludge after dewatering is about 60%, and this kind of sludge cannot directly enter the thermal desorption system. Therefore, the moisture content for sludge should be reduced to below 20% in the sludge dryer. The heat source of the sludge dryer mainly comes from the heat recovered by the electric and waste heat boilers. The steam generated during the drying process is sent to the condensate recovery system for condensation. After the oil and water are condensed, the condensate is sent to the oil-water separator for oil-water separation. The recovered oil is collected and transported to the treatment station for further treatment. The separated water enters the integrated treatment system for sewage treatment, then is reused for the thermal chemical washing tank for the oil sludge. The non-condensable light component (non-condensable gas) is transported to the high-temperature combustion oxidation system for complete combustion oxidation to ensure that the flue gas is fully purified.
(5) Thermal desorption treatment and high-temperature combustion oxidation treatment for oil sludge: the oil sludge treated by the sludge dryer is sent to the thermal desorption system through the feeding system, and the continuous feeding of the sludge makes the feed port form a "soil stopper". This stopper can reduce the amount of air entering the thermal desorption system, effectively block the thermal desorption system from the atmosphere, and ensure that the thermal desorption chamber is kept at a state of micro-negative pressure. The sludge is transported through the stainless steel track in the thermal desorption chamber. The flow of oil sludge transportation is opposite to the direction of the flue gas flow. During the
9 Date Recue/Date Received 2020-08-11 transportation, the sludge is heated by a series of thermal desorption burners at the top of the thermal desorption system, the amount of air entering is strictly controlled to ensure that the oil sludge is desorbed and decomposed in the absence of oxygen. Depending on the type of oil sludge and the moisture content of oil sludge, the temperature of the thermal desorption chamber can be set between 300 C and 750 C to ensure complete desorption of the various hydrocarbon fractions in the oil sludge. The flue gas generated from the thermal desorption system enters the high-temperature combustion oxidation system. The high-temperature combustion oxidation system uses natural gas as open flame for combustion. The working temperature is set in the range of 850 C-1100 C, and the set residence time is ranging 1.5s-2.0s to ensure that organic components such as petroleum hydrocarbons in the non-condensable gas are completely and harmlessly eliminated, and prevent the production of dioxins.
(6) Heat exchange treatment: the flue gas generated in the thermal desorption system in the step (5) and the non-condensable light component produced in the condensate recovery system in the step (4) are sent to the high-temperature combustion oxidation system for complete combustion oxidation. Then, the high-temperature exhaust gas from the high-temperature combustion oxidation system is sent to the waste heat boiler for waste heat recovery, then becomes a medium-temperature exhaust gas at 500 C. Meanwhile, the generated superheated steam is used as a heat source for the thermal chemical washing tank and the sludge dryer.
(7) Cooling and dust removal treatment for exhaust gas: the medium-temperature tail gasfrom the waste heat boiler is sent to the quench tower in which the temperature of the tail gas is reduced from 500 C to below 200 C in is, to avoid the regeneration of dioxins. Then the dust is removed, and the lye is sprayed to remove the acid gas. The treated tail gas met the standard is discharged to the atmosphere through the chimney.
Date Recue/Date Received 2020-08-11 The structure of the processing system used to implement the above methods is shown in FIG 2:
The whole system of the invention comprises two parts: a thermal chemical washing system for oil sludge and a thermal desorption system for oil sludge.
The thermal chemical washing system is composed of an oil sludge homogenization tank 1, a thermal chemical washing tank 2, a high-efficiency solid-liquid separator 3, an oil-water separator 4, an integrated treatment system for sewage treatment 6, and a water storage tank 23 sequentially connected by pipelines. The oil sludge homogenization tank 1 has a bar screen 27, and the discharge port of the oil sludge homogenization tank 1 is connected to the inlet of the thermal chemical washing tank 2 through the first sludge pump 24. The thermal chemical washing tank 2 has an impeller and a dosing system 22 for washing agent. The top oil outlet of the thermal chemical washing tank 2 is connected to the oil recovery tank 5, and the bottom discharge port of the thermal chemical washing tank 2 is connected to the inlet of the high-efficiency solid-liquid separator 3 through the second sludge pump 25.
The solid discharge port of the high-efficiency solid-liquid separator 3 is connected to the feed port of the sludge dryer 10, and the liquid outlet of the high-efficiency solid-liquid separator 3 is connected with the inlet of the oil-water separator 4 through the sewage pump 26. The water outlet of the oil-water separator 4 is connected to the water inlet of the integrated treatment system for sewage treatment 6, and the water outlet of the integrated treatment system for sewage treatment 6 is connected with the inlet of the water storage tank 23.
The water in the water storage tank 23 is eventually returned to the thermal chemical washing tank 2 for reuse.
The thermal desorption system for oil sludge comprises a sludge dryer 10, a condensate recovery system 11, a thermal desorption feeding system 7, a thermal desorption system 8, a high-temperature combustion oxidation system 9, a waste heat boiler 13, a cooling and dust removal treatment system for exhaust gas, and a discharge system. The steam outlet of the sludge dryer 10 is connected to the condensate recovery system 11, and the non-condensable Date Recue/Date Received 2020-08-11 gas outlet of the condensate recovery system 11 is connected to the high-temperature combustion oxidation system 9 for recycling. The condensate outlet of the condensate recovery system 11 is connected to the oil-water separator 4 via a pipeline equipped with a condensate pump 12. The solid discharge port of the sludge dryer 10 is connected to the thermal desorption feeding system 7. The thermal desorption feeding system 7 includes a feed silo 71, a belt conveyor 72, and a metering feed hopper 73. The feed silo 71 is located at the inlet end of the belt conveyor 72, and the metering feed hopper 73 is located at the outlet end of the belt conveyor 72. The feed silo 71 is connected to the solid discharge port of the sludge dryer 10, and the metering feed hopper 73 of the thermal desorption feed system 7 is installed at the inlet of the thermal desorption system 8. The thermal desorption system 8 includes a refractory-coated thermal desorption chamber, a series of thermal desorption burners 82 arranged on both sides of the center line of the top of thermal desorption, and a stainless steel crawler conveyor belt 81 under the thermal desorption burners 82. The thermal desorption chamber has feeding port at one end, a discharge propeller 84 at the other end. A thermal desorption flue gas outlet 83 is set at the top of the thermal desorption chamber. A discharge propeller 84 is connected to the discharge system. The mentioned discharge system is composed of a discharge hopper 19, a double helix discharge machine 20, and a discharge silo 21. The discharge hopper 19 is located at inlet of the double helix discharge machine 20. The discharge silo 21 is located at the outlet of the double helix discharge machine 20. The outer layer of the double helix discharge machine 20 is covered with a layer of cooling water, and a spray device is arranged on the top of the discharge silo 21 to reduce the temperature and dust of the dregs in the silo. The thermal desorption flue gas outlet 83 is connected with the exhaust gas inlet 91 of the high-temperature combustion oxidation system 9.
The high-temperature combustion oxidation system 9 comprises a high-temperature combustion chamber. The high-temperature combustion chamber is horizontally installed and coated with refractory material inside. One end of the high temperature combustion chamber is and set Date Recue/Date Received 2020-08-11 with a flue gas inlet 91 and a high-temperature burner 92, and the other end has an exhaust gas outlet 93 connected to the waste heat boiler 13. The heat source outlet of the waste heat boiler 13 is connected to the thermal chemical washing tank 2 and the sludge dryer 10. The tail gas outlet of the waste heat boiler is connected with the cooling and dust removal treatment system for exhaust gas. The tail gas is discharged to the atmosphere after being treated by the cooling and dust removal treatment system for exhaust gas.
The oil-water separator 4 of this invention is composed of a buffer tank 41, a reaction tank 42, an oil storage tank 44, and a water discharge tank 43. The buffer tank 41, the reaction tank 42, and the water discharge tank 43 are arranged in order. The oil storage tank 44 is located on the top of the reaction tank 42. The oil storage tank 44 is connected to the oil recovery tank 5, and the buffer tank 41 is connected to the liquid outlet of the high-efficiency solid-liquid separator 3.
The cooling and dust removal treatment system for exhaust gas of this invention comprises a quench tower 14, a spray tower 15, a settling tower 16, an induced draft fan 17, and a chimney 18. The spray tower 15 is connected with the settling tower 16, and the quench tower 14 is connected to the spray tower 15. The outlet of the settling tower 16 is connected to the chimney 18 via a pipeline installed the induced draft fan 17. The treated exhaust gas is eventually discharged in the atmosphere through the chimney 18 with the help of the induced draft fan 17, after meeting the standard for emission.
The metering feed hopper 73 of the thermal desorption feeding system 7 of this invention adopts a double helix feeding mode, and forms a soil stopper through the bottom reduction design to reduce the entry of outside air into the thermal desorption system 8.
The working process of the processing system of this invention is as follows:
The oil sludge is sent to the oil sludge homogenizing tank 1, and the bar screen 27 is installed at the water outlet of the oil sludge homogenizing tank 1. During the conditioning process, the dispersant may be added to adjust the dispersibility of the oil sludge. So rubbish Date Recue/Date Received 2020-08-11 and sundries (fragments of color-strip woven bag, labour protection appliance, weeds, bricks, wires) which are larger than 10 mm are intercepted by the grille, and the debris intercepted by the grille is regularly cleaned.
The oil sludge after pretreatment is pumped into the thermal chemical washing tank 2 by the first sludge pump 24. The thermal chemical washing tank 2 is equipped with a dosing system 22. The stirring paddle in the tank is used to fully agitate the green washing agent, hot water, and the oil sludge, to separate the crude oil from the oil sludge. The separated oil is scraped from the top of the thermal chemical washing tank 2 and is stored in the oil recovery tank 5. The solid phase after thermal chemical washing enters the high-efficiency solid-liquid separator 3 from the bottom of thermal chemical washing tank 2 by the second sludge pump 25.
The oil content of the oil sludge separated by the high-efficiency solid-liquid separator 3 is reduced to 3%-6%, and the water content is 60%-70%. A small dump truck transfers separated sludge to the temporary storage area or directly to the sludge dryer
(6) Heat exchange treatment: the flue gas generated in the thermal desorption system in the step (5) and the non-condensable light component produced in the condensate recovery system in the step (4) are sent to the high-temperature combustion oxidation system for complete combustion oxidation. Then, the high-temperature exhaust gas from the high-temperature combustion oxidation system is sent to the waste heat boiler for waste heat recovery, then becomes a medium-temperature exhaust gas at 500 C. Meanwhile, the generated superheated steam is used as a heat source for the thermal chemical washing tank and the sludge dryer.
(7) Cooling and dust removal treatment for exhaust gas: the medium-temperature tail gasfrom the waste heat boiler is sent to the quench tower in which the temperature of the tail gas is reduced from 500 C to below 200 C in is, to avoid the regeneration of dioxins. Then the dust is removed, and the lye is sprayed to remove the acid gas. The treated tail gas met the standard is discharged to the atmosphere through the chimney.
Date Recue/Date Received 2020-08-11 The structure of the processing system used to implement the above methods is shown in FIG 2:
The whole system of the invention comprises two parts: a thermal chemical washing system for oil sludge and a thermal desorption system for oil sludge.
The thermal chemical washing system is composed of an oil sludge homogenization tank 1, a thermal chemical washing tank 2, a high-efficiency solid-liquid separator 3, an oil-water separator 4, an integrated treatment system for sewage treatment 6, and a water storage tank 23 sequentially connected by pipelines. The oil sludge homogenization tank 1 has a bar screen 27, and the discharge port of the oil sludge homogenization tank 1 is connected to the inlet of the thermal chemical washing tank 2 through the first sludge pump 24. The thermal chemical washing tank 2 has an impeller and a dosing system 22 for washing agent. The top oil outlet of the thermal chemical washing tank 2 is connected to the oil recovery tank 5, and the bottom discharge port of the thermal chemical washing tank 2 is connected to the inlet of the high-efficiency solid-liquid separator 3 through the second sludge pump 25.
The solid discharge port of the high-efficiency solid-liquid separator 3 is connected to the feed port of the sludge dryer 10, and the liquid outlet of the high-efficiency solid-liquid separator 3 is connected with the inlet of the oil-water separator 4 through the sewage pump 26. The water outlet of the oil-water separator 4 is connected to the water inlet of the integrated treatment system for sewage treatment 6, and the water outlet of the integrated treatment system for sewage treatment 6 is connected with the inlet of the water storage tank 23.
The water in the water storage tank 23 is eventually returned to the thermal chemical washing tank 2 for reuse.
The thermal desorption system for oil sludge comprises a sludge dryer 10, a condensate recovery system 11, a thermal desorption feeding system 7, a thermal desorption system 8, a high-temperature combustion oxidation system 9, a waste heat boiler 13, a cooling and dust removal treatment system for exhaust gas, and a discharge system. The steam outlet of the sludge dryer 10 is connected to the condensate recovery system 11, and the non-condensable Date Recue/Date Received 2020-08-11 gas outlet of the condensate recovery system 11 is connected to the high-temperature combustion oxidation system 9 for recycling. The condensate outlet of the condensate recovery system 11 is connected to the oil-water separator 4 via a pipeline equipped with a condensate pump 12. The solid discharge port of the sludge dryer 10 is connected to the thermal desorption feeding system 7. The thermal desorption feeding system 7 includes a feed silo 71, a belt conveyor 72, and a metering feed hopper 73. The feed silo 71 is located at the inlet end of the belt conveyor 72, and the metering feed hopper 73 is located at the outlet end of the belt conveyor 72. The feed silo 71 is connected to the solid discharge port of the sludge dryer 10, and the metering feed hopper 73 of the thermal desorption feed system 7 is installed at the inlet of the thermal desorption system 8. The thermal desorption system 8 includes a refractory-coated thermal desorption chamber, a series of thermal desorption burners 82 arranged on both sides of the center line of the top of thermal desorption, and a stainless steel crawler conveyor belt 81 under the thermal desorption burners 82. The thermal desorption chamber has feeding port at one end, a discharge propeller 84 at the other end. A thermal desorption flue gas outlet 83 is set at the top of the thermal desorption chamber. A discharge propeller 84 is connected to the discharge system. The mentioned discharge system is composed of a discharge hopper 19, a double helix discharge machine 20, and a discharge silo 21. The discharge hopper 19 is located at inlet of the double helix discharge machine 20. The discharge silo 21 is located at the outlet of the double helix discharge machine 20. The outer layer of the double helix discharge machine 20 is covered with a layer of cooling water, and a spray device is arranged on the top of the discharge silo 21 to reduce the temperature and dust of the dregs in the silo. The thermal desorption flue gas outlet 83 is connected with the exhaust gas inlet 91 of the high-temperature combustion oxidation system 9.
The high-temperature combustion oxidation system 9 comprises a high-temperature combustion chamber. The high-temperature combustion chamber is horizontally installed and coated with refractory material inside. One end of the high temperature combustion chamber is and set Date Recue/Date Received 2020-08-11 with a flue gas inlet 91 and a high-temperature burner 92, and the other end has an exhaust gas outlet 93 connected to the waste heat boiler 13. The heat source outlet of the waste heat boiler 13 is connected to the thermal chemical washing tank 2 and the sludge dryer 10. The tail gas outlet of the waste heat boiler is connected with the cooling and dust removal treatment system for exhaust gas. The tail gas is discharged to the atmosphere after being treated by the cooling and dust removal treatment system for exhaust gas.
The oil-water separator 4 of this invention is composed of a buffer tank 41, a reaction tank 42, an oil storage tank 44, and a water discharge tank 43. The buffer tank 41, the reaction tank 42, and the water discharge tank 43 are arranged in order. The oil storage tank 44 is located on the top of the reaction tank 42. The oil storage tank 44 is connected to the oil recovery tank 5, and the buffer tank 41 is connected to the liquid outlet of the high-efficiency solid-liquid separator 3.
The cooling and dust removal treatment system for exhaust gas of this invention comprises a quench tower 14, a spray tower 15, a settling tower 16, an induced draft fan 17, and a chimney 18. The spray tower 15 is connected with the settling tower 16, and the quench tower 14 is connected to the spray tower 15. The outlet of the settling tower 16 is connected to the chimney 18 via a pipeline installed the induced draft fan 17. The treated exhaust gas is eventually discharged in the atmosphere through the chimney 18 with the help of the induced draft fan 17, after meeting the standard for emission.
The metering feed hopper 73 of the thermal desorption feeding system 7 of this invention adopts a double helix feeding mode, and forms a soil stopper through the bottom reduction design to reduce the entry of outside air into the thermal desorption system 8.
The working process of the processing system of this invention is as follows:
The oil sludge is sent to the oil sludge homogenizing tank 1, and the bar screen 27 is installed at the water outlet of the oil sludge homogenizing tank 1. During the conditioning process, the dispersant may be added to adjust the dispersibility of the oil sludge. So rubbish Date Recue/Date Received 2020-08-11 and sundries (fragments of color-strip woven bag, labour protection appliance, weeds, bricks, wires) which are larger than 10 mm are intercepted by the grille, and the debris intercepted by the grille is regularly cleaned.
The oil sludge after pretreatment is pumped into the thermal chemical washing tank 2 by the first sludge pump 24. The thermal chemical washing tank 2 is equipped with a dosing system 22. The stirring paddle in the tank is used to fully agitate the green washing agent, hot water, and the oil sludge, to separate the crude oil from the oil sludge. The separated oil is scraped from the top of the thermal chemical washing tank 2 and is stored in the oil recovery tank 5. The solid phase after thermal chemical washing enters the high-efficiency solid-liquid separator 3 from the bottom of thermal chemical washing tank 2 by the second sludge pump 25.
The oil content of the oil sludge separated by the high-efficiency solid-liquid separator 3 is reduced to 3%-6%, and the water content is 60%-70%. A small dump truck transfers separated sludge to the temporary storage area or directly to the sludge dryer
10. The sewage separated by the high-efficiency solid-liquid separator 3 is sent to the oil-water separator 4 by the sewage pump 26. Then the sewage first enters the sewage buffer tank 41, and flows into the reaction tank 42 for aeration to separate the oil and water. The separated oil flows into the oil storage tank 44, and the separated water enters the integrated treatment system for sewage treatment 6 through the water discharge tank 43. The treated water is stored in a water storage tank 23 and recycled for thermal chemical washing tank 2.
The moisture content for sludge after dewatering is too high to directly enter the thermal desorption system, so it needs to be dried in the sludge dryer 10 to reduce the moisture content to less than 20%. The heat source of the sludge dryer 10 mainly comes from the heat recovered by the industrial electricity and the waste heat boiler 13. The steam generated in the drying process enters the condensate recovery system 11 for condensation, and the oil and water are condensed. Then the condensate enters the oil-water separator 4. The recovered oil Date Recue/Date Received 2020-08-11 enters the oil recovery tank 5 and is transported to the treatment station for treatment. The water separated by the oil-water separator 4 enters the integrated treatment system for sewage treatment 6 for reuse in the thermal chemical washing tank 2. The non-condensable light component (non-condensable gas) is delivered to the high-temperature burner 92 of the high-temperature combustion oxidation system 9 for complete combustion oxidation to ensure that the flue gas is sufficiently purified.
The oil sludge which has been dried by the sludge dryer 10 is sent to the metering feed hopper 73 at the top of the thermal desorption system 8 through the thermal desorption feeding system 7. The oil sludge forms a "soil stopper" in the metering feed hopper 73. This stopper can reduce the amount of air entering the thermal desorption system 8 and effectively block the thermal desorption system 8 from the atmosphere, and ensure that the thermal desorption chamber is kept at a state of micro-negative pressure. The sludge is transported through the stainless steel crawler conveyor belt 81 in the thermal desorption chamber. The flow of oil sludge transportation is opposite to the direction of the flue gas flow. During the transportation, the sludge is heated by a series of thermal desorption burners 82 at the top of the thermal desorption system, and the amount of air entering is strictly controlled to ensure that the oil sludge is desorbed and decomposed in the absence of oxygen.
The 1000 C high-temperature exhaust gas from the high-temperature combustion oxidation system 9 is sent to the waste heat boiler 13 for waste heat recovery, and the generated superheated steam is used as a heat source for the thermal chemical washing tank 2 and the sludge dryer 10. The temperature of the exhaust gas recovered by the waste heat boiler 13 is reduced to 500 C or less. The heat is fully recovered, and the dioxin regeneration is avoided. The medium-temperature tail gas from the waste heat boiler is sent to the quench tower 14 in which the temperature of the tail gas is reduced from 500 C to below 200 C in is, to avoid the generation of dioxins. The cooled tail gas enters the spray tower 15 and the settling tower 16 again. The dust is removed, and the lye is sprayed to remove the acid gas.
Date Recue/Date Received 2020-08-11 The treated tail gas met the standard is discharged to the atmosphere through the chimney.
The dreg treated by the thermal desorption system 8 is dropped onto the discharge hopper 19 by the discharge propeller 84, and then transported to the discharge silo 21 for storage by the double helix discharge machine 20. The outer layer of the double helix discharge machine 20 is covered with a layer of cooling water to prevent that the high discharge temperature affects the service life of the equipment. The discharge silo 21 is sealed, and the top of the discharge silo has a sprinkler to reduce the temperature and dust for the dregs in the silo.
Application examples of this invention:
Example 1:
Taking the tank-bottom oil sludge of an oilfield as the treatment object, the moisture content was 50%; the oil content was 18%; the average particle size was less than 5mm. After conditioning, oil sludge entered the thermal chemical washing tank, and the recovery rate of crude oil after washing was 66.7%. After the treatment by the high-efficiency solid-liquid separator, the moisture content for oil sludge was 65%, and the oil content was reduced to 6%.
After drying, the moisture content for oil sludge was reduced to 20%, and the dried oil sludge was sent to the metering feeding hopper by the thermal desorption feeding system. Then the oil sludge dropped on the stainless steel crawler conveyor belt in the thermal desorption system. The temperature of the thermal desorption chamber was controlled within the range of 500 C ¨700 C, and the residence time was 20min. The temperature of the high-temperature combustion oxidation chamber was controlled at 1100 C, and the residence time was 2s. The oil content of the dreg after thermal desorption was 220 mg/kg, and the removal rate was 99.69%. The dioxin content of the high-concentration tail gas after purification by high-temperature oxidation combustion was less than 0.1TEQng/Nm3, and the tail gas after treatment reached the emission standards.
Date Recue/Date Received 2020-08-11 Example 2:
Taking the oil sludge of an oilfield as the treatment object, the moisture content was 40%;
the oil content was 15%; the average particle size was less than lOmm. After conditioning, oil sludge entered the thermal chemical washing tank, and the recovery rate of crude oil after washing was 80%. After the treatment by the high-efficiency solid-liquid separator, the moisture content for oil sludge was 60%-65%, and the oil content was reduced to 3%. After drying, the moisture content for oil sludge was reduced to 19%, and the dried oil sludge was sent to the metering feeding hopper by the thermal desorption feeding system.
Then the oil sludge dropped on the stainless steel crawler conveyor belt in the thermal desorption system.
The temperature of the thermal desorption chamber was controlled within the range of 300 C
¨500 C, and the residence time was 18min. The temperature of the high-temperature combustion oxidation chamber was controlled at 850 C, and the residence time was 1.5s. The oil content of the dreg after thermal desorption was 200 mg/kg, and the removal rate was 99.62%. The dioxin content of the high-concentration tail gas after purification by high-temperature oxidation combustion was less than 0.1TEQng/Nm3, and the tail gas after treatment reached the emission standards.
Example 3:
Taking the oil sand of an oilfield as the treatment object, the moisture content was 55%;
the oil content was 25%; the average particle size was less than lOmm. After conditioning, oil sludge entered the thermal chemical washing tank, and the recovery rate of crude oil after washing was 80%. After the treatment by the high-efficiency solid-liquid separator, the moisture content for oil sludge was 60%-65%, and the oil content was reduced to 5%. After drying, the moisture content for oil sludge was reduced to 18%, and the dried oil sludge was sent to the metering feeding hopper by the thermal desorption feeding system.
Then the oil sludge dropped on the stainless steel crawler conveyor belt in the thermal desorption system.
The temperature of the thermal desorption chamber was controlled within the range of 400 C
Date Recue/Date Received 2020-08-11 ¨550 C, and the residence time was 20min. The temperature of the high-temperature combustion oxidation chamber was controlled at 950 C, and the residence time was 1.8s. The oil content of the dreg after thermal desorption was 180 mg/kg, and the removal rate was 99.71%. The dioxin content of the high-concentration tail gas after purification by high-temperature oxidation combustion was less than 0.1TEQng/Nm3, and the tail gas after treatment reached the emission standards.
Date Recue/Date Received 2020-08-11
The moisture content for sludge after dewatering is too high to directly enter the thermal desorption system, so it needs to be dried in the sludge dryer 10 to reduce the moisture content to less than 20%. The heat source of the sludge dryer 10 mainly comes from the heat recovered by the industrial electricity and the waste heat boiler 13. The steam generated in the drying process enters the condensate recovery system 11 for condensation, and the oil and water are condensed. Then the condensate enters the oil-water separator 4. The recovered oil Date Recue/Date Received 2020-08-11 enters the oil recovery tank 5 and is transported to the treatment station for treatment. The water separated by the oil-water separator 4 enters the integrated treatment system for sewage treatment 6 for reuse in the thermal chemical washing tank 2. The non-condensable light component (non-condensable gas) is delivered to the high-temperature burner 92 of the high-temperature combustion oxidation system 9 for complete combustion oxidation to ensure that the flue gas is sufficiently purified.
The oil sludge which has been dried by the sludge dryer 10 is sent to the metering feed hopper 73 at the top of the thermal desorption system 8 through the thermal desorption feeding system 7. The oil sludge forms a "soil stopper" in the metering feed hopper 73. This stopper can reduce the amount of air entering the thermal desorption system 8 and effectively block the thermal desorption system 8 from the atmosphere, and ensure that the thermal desorption chamber is kept at a state of micro-negative pressure. The sludge is transported through the stainless steel crawler conveyor belt 81 in the thermal desorption chamber. The flow of oil sludge transportation is opposite to the direction of the flue gas flow. During the transportation, the sludge is heated by a series of thermal desorption burners 82 at the top of the thermal desorption system, and the amount of air entering is strictly controlled to ensure that the oil sludge is desorbed and decomposed in the absence of oxygen.
The 1000 C high-temperature exhaust gas from the high-temperature combustion oxidation system 9 is sent to the waste heat boiler 13 for waste heat recovery, and the generated superheated steam is used as a heat source for the thermal chemical washing tank 2 and the sludge dryer 10. The temperature of the exhaust gas recovered by the waste heat boiler 13 is reduced to 500 C or less. The heat is fully recovered, and the dioxin regeneration is avoided. The medium-temperature tail gas from the waste heat boiler is sent to the quench tower 14 in which the temperature of the tail gas is reduced from 500 C to below 200 C in is, to avoid the generation of dioxins. The cooled tail gas enters the spray tower 15 and the settling tower 16 again. The dust is removed, and the lye is sprayed to remove the acid gas.
Date Recue/Date Received 2020-08-11 The treated tail gas met the standard is discharged to the atmosphere through the chimney.
The dreg treated by the thermal desorption system 8 is dropped onto the discharge hopper 19 by the discharge propeller 84, and then transported to the discharge silo 21 for storage by the double helix discharge machine 20. The outer layer of the double helix discharge machine 20 is covered with a layer of cooling water to prevent that the high discharge temperature affects the service life of the equipment. The discharge silo 21 is sealed, and the top of the discharge silo has a sprinkler to reduce the temperature and dust for the dregs in the silo.
Application examples of this invention:
Example 1:
Taking the tank-bottom oil sludge of an oilfield as the treatment object, the moisture content was 50%; the oil content was 18%; the average particle size was less than 5mm. After conditioning, oil sludge entered the thermal chemical washing tank, and the recovery rate of crude oil after washing was 66.7%. After the treatment by the high-efficiency solid-liquid separator, the moisture content for oil sludge was 65%, and the oil content was reduced to 6%.
After drying, the moisture content for oil sludge was reduced to 20%, and the dried oil sludge was sent to the metering feeding hopper by the thermal desorption feeding system. Then the oil sludge dropped on the stainless steel crawler conveyor belt in the thermal desorption system. The temperature of the thermal desorption chamber was controlled within the range of 500 C ¨700 C, and the residence time was 20min. The temperature of the high-temperature combustion oxidation chamber was controlled at 1100 C, and the residence time was 2s. The oil content of the dreg after thermal desorption was 220 mg/kg, and the removal rate was 99.69%. The dioxin content of the high-concentration tail gas after purification by high-temperature oxidation combustion was less than 0.1TEQng/Nm3, and the tail gas after treatment reached the emission standards.
Date Recue/Date Received 2020-08-11 Example 2:
Taking the oil sludge of an oilfield as the treatment object, the moisture content was 40%;
the oil content was 15%; the average particle size was less than lOmm. After conditioning, oil sludge entered the thermal chemical washing tank, and the recovery rate of crude oil after washing was 80%. After the treatment by the high-efficiency solid-liquid separator, the moisture content for oil sludge was 60%-65%, and the oil content was reduced to 3%. After drying, the moisture content for oil sludge was reduced to 19%, and the dried oil sludge was sent to the metering feeding hopper by the thermal desorption feeding system.
Then the oil sludge dropped on the stainless steel crawler conveyor belt in the thermal desorption system.
The temperature of the thermal desorption chamber was controlled within the range of 300 C
¨500 C, and the residence time was 18min. The temperature of the high-temperature combustion oxidation chamber was controlled at 850 C, and the residence time was 1.5s. The oil content of the dreg after thermal desorption was 200 mg/kg, and the removal rate was 99.62%. The dioxin content of the high-concentration tail gas after purification by high-temperature oxidation combustion was less than 0.1TEQng/Nm3, and the tail gas after treatment reached the emission standards.
Example 3:
Taking the oil sand of an oilfield as the treatment object, the moisture content was 55%;
the oil content was 25%; the average particle size was less than lOmm. After conditioning, oil sludge entered the thermal chemical washing tank, and the recovery rate of crude oil after washing was 80%. After the treatment by the high-efficiency solid-liquid separator, the moisture content for oil sludge was 60%-65%, and the oil content was reduced to 5%. After drying, the moisture content for oil sludge was reduced to 18%, and the dried oil sludge was sent to the metering feeding hopper by the thermal desorption feeding system.
Then the oil sludge dropped on the stainless steel crawler conveyor belt in the thermal desorption system.
The temperature of the thermal desorption chamber was controlled within the range of 400 C
Date Recue/Date Received 2020-08-11 ¨550 C, and the residence time was 20min. The temperature of the high-temperature combustion oxidation chamber was controlled at 950 C, and the residence time was 1.8s. The oil content of the dreg after thermal desorption was 180 mg/kg, and the removal rate was 99.71%. The dioxin content of the high-concentration tail gas after purification by high-temperature oxidation combustion was less than 0.1TEQng/Nm3, and the tail gas after treatment reached the emission standards.
Date Recue/Date Received 2020-08-11
Claims (10)
What is claimed is:
1. An environmentally friendly remediation method and system combined soil washing and thermal desorption for treating high-concentration oily sludge, is characterized by its processing steps:
(1) Pretreatment for homogenization and impurity removal: conditioning and dispersing the oily sludge, and removing rubbish and sundries in the slurry;
(2) Thermal chemical washing treatment: the sludge after homogenization and impurity removal is sent to thermal chemical washing tank containing hot water and washing agent;
then stirring separates the crude oil from the oily sludge, and the crude oil in the top of the thermal chemical washing tank is scraped out and stored in a recycle oil tank;
the solid phase after thermal chemical washing is discharged from the bottom of the tank into the high-efficiency solid-liquid separator;
(3) Solid-liquid separation and oil-water separation: solid-liquid separation is conducted by high-efficiency solid-liquid separator, and the oil content of the treated oily sludge is reduced to 3%-6% while the water content is 60%-70%; then the oily sludge is transported to temporary storage area, or directly sent to the sludge dryer; the sewage separated by the high-efficiency solid-liquid separator is sent to the oil-water separator, and the oil separated by the oil-water separator is sent to the oil recovery tank; the sewage separated by the oil-water separator is sent to the integrated treatment system for sewage treatment, and the treated water is stored in the water storage tank and recycled for thermal chemical washing tank;
(4) Oily sludge drying and condensing recovery treatment: the oily sludge sent to the sludge dryer is dried to a moisture content less than 20%, and the steam generated during the drying process is sent to a condensate recovery system for condensation; the oil and water in the condensate are sent to the oil-water separator for oil-water separation;
(5) Thermal desorption treatment and high-temperature combustion oxidation treatment for oily sludge: the oily sludge treated by the sludge dryer is sent to the thermal desorption system, and the temperature of the thermal desorption chamber which must have a negative pressure is controlled at 300°C-750°C; the direction of oily sludge transportation need to opposite to the direction of flue gas flow, and make sure that the sludge is desorbed and decomposed under oxygen-deficient condition;
(6) Heat exchange treatment: the flue gas generated in the thermal desorption system in the step (5) and the non-condensable light component produced in the condensate recovery system in the step (4) are sent to the high-temperature combustion oxidation system for complete combustion oxidation; the high-temperature exhaust gas from the high-temperature combustion oxidation system is sent to the waste heat boiler for waste heat recycle, and the generated superheated steam is used as a heat source for the thermal chemical washing tank and the sludge dryer;
(7) Cooling and dust removal treatment for exhaust gas: the medium-temperature tail gas from the waste heat boiler is sent to the quench tower, and the temperature of which is reduced to below 200°C through the quench tower; then the acid gas is removed by cooling, dusting, and spraying the alkali liquid; the treated tail gas met the standard is discharged into the atmosphere through the chimney.
(1) Pretreatment for homogenization and impurity removal: conditioning and dispersing the oily sludge, and removing rubbish and sundries in the slurry;
(2) Thermal chemical washing treatment: the sludge after homogenization and impurity removal is sent to thermal chemical washing tank containing hot water and washing agent;
then stirring separates the crude oil from the oily sludge, and the crude oil in the top of the thermal chemical washing tank is scraped out and stored in a recycle oil tank;
the solid phase after thermal chemical washing is discharged from the bottom of the tank into the high-efficiency solid-liquid separator;
(3) Solid-liquid separation and oil-water separation: solid-liquid separation is conducted by high-efficiency solid-liquid separator, and the oil content of the treated oily sludge is reduced to 3%-6% while the water content is 60%-70%; then the oily sludge is transported to temporary storage area, or directly sent to the sludge dryer; the sewage separated by the high-efficiency solid-liquid separator is sent to the oil-water separator, and the oil separated by the oil-water separator is sent to the oil recovery tank; the sewage separated by the oil-water separator is sent to the integrated treatment system for sewage treatment, and the treated water is stored in the water storage tank and recycled for thermal chemical washing tank;
(4) Oily sludge drying and condensing recovery treatment: the oily sludge sent to the sludge dryer is dried to a moisture content less than 20%, and the steam generated during the drying process is sent to a condensate recovery system for condensation; the oil and water in the condensate are sent to the oil-water separator for oil-water separation;
(5) Thermal desorption treatment and high-temperature combustion oxidation treatment for oily sludge: the oily sludge treated by the sludge dryer is sent to the thermal desorption system, and the temperature of the thermal desorption chamber which must have a negative pressure is controlled at 300°C-750°C; the direction of oily sludge transportation need to opposite to the direction of flue gas flow, and make sure that the sludge is desorbed and decomposed under oxygen-deficient condition;
(6) Heat exchange treatment: the flue gas generated in the thermal desorption system in the step (5) and the non-condensable light component produced in the condensate recovery system in the step (4) are sent to the high-temperature combustion oxidation system for complete combustion oxidation; the high-temperature exhaust gas from the high-temperature combustion oxidation system is sent to the waste heat boiler for waste heat recycle, and the generated superheated steam is used as a heat source for the thermal chemical washing tank and the sludge dryer;
(7) Cooling and dust removal treatment for exhaust gas: the medium-temperature tail gas from the waste heat boiler is sent to the quench tower, and the temperature of which is reduced to below 200°C through the quench tower; then the acid gas is removed by cooling, dusting, and spraying the alkali liquid; the treated tail gas met the standard is discharged into the atmosphere through the chimney.
2. The method of claim 1 wherein in the step (6): the high-temperature combustion oxidation system is burned by natural gas, the working temperature is 850°C-1100°C, and the residence time is 1.5-2.0s to ensure the complete elimination of organic components and prevent the production of dioxins.
3. The method of claim 1 or claim 2 wherein in the step (6): the high-temperature exhaust gas from the high-temperature combustion oxidation system is about 1000°C, and it is sent to the waste heat boiler for waste heat recovery, then it's reduced to a medium-temperature tail gas of 500°C.
4. An Environmentally friendly method and system combined with soil washing and thermal desorption for high-concentration oily sludge, characterized in that it is mainly composed of a thermal chemical washing system and a thermal desorption system;
the thermal chemical washing system is composed of oily sludge homogenizing tank 1, thermal chemical washing tank 2, high-efficiency solid-liquid separator 3, oil-water separator 4, integrated treatment system for sewage treatment 6, and water storage tank 23 sequentially connected by pipelines; the top oil outlet of the thermal chemical washing tank 2 and the oil outlet of the oil-water separator 4 are respectively connected to the oil recovery tank 5; the bottom of the thermal chemical washing tank 2 is connected to the high-efficiency solid-liquid separator 3, and the liquid outlet of the high-efficiency solid-liquid separator 3 is connect with oil-water separator 4; the thermal chemical washing system comprises an sludge dryer 10, a condensate recovery system 11, a thermal desorption feeding system 7, a thermal desorption system 8, a high-temperature combustion oxidation system 9, a waste heat boiler 13, cooling and dust removal treatment and emission system for exhaust gas; the solid discharge port of the high efficiency solid-liquid separator 3 is connected with the feed port of the sludge dryer 10, and the steam outlet of sludge dryer 10 is connected with condensate recovery system 11;
the non-condensable gas outlet of the condensate recovery system 11 is connected to the high-temperature combustion oxidation system 9; the condensate outlet of the condensate recovery system 11 is connected to the oil-water separator 4; the solid discharge port of the sludge dryer 10 is connected with the thermal desorption feeding system 7, and the thermal desorption feed system 7 is connected to the thermal desorption system 8; the thermal desorption flue gas outlet 83 of the thermal desorption system 8 is connected to the flue gas inlet 91 of the high-temperature combustion oxidation system 9; the discharge port of the thermal desorption system 8 is connected to the discharge system, and the exhaust gas outlet 93 of the high-temperature combustion oxidation system 9 is connected to the waste heat boiler 13; the steam outlet of the waste heat boiler 13 is connected to the thermal chemical washing tank 2 and the sludge dryer 10; the tail gas outlet of the waste heat boiler is connected with the cooling and dust removal system for exhaust gas, then the treated tail gas is discharged to the atmosphere after being treated by the cooling and dust removal treatment system.
the thermal chemical washing system is composed of oily sludge homogenizing tank 1, thermal chemical washing tank 2, high-efficiency solid-liquid separator 3, oil-water separator 4, integrated treatment system for sewage treatment 6, and water storage tank 23 sequentially connected by pipelines; the top oil outlet of the thermal chemical washing tank 2 and the oil outlet of the oil-water separator 4 are respectively connected to the oil recovery tank 5; the bottom of the thermal chemical washing tank 2 is connected to the high-efficiency solid-liquid separator 3, and the liquid outlet of the high-efficiency solid-liquid separator 3 is connect with oil-water separator 4; the thermal chemical washing system comprises an sludge dryer 10, a condensate recovery system 11, a thermal desorption feeding system 7, a thermal desorption system 8, a high-temperature combustion oxidation system 9, a waste heat boiler 13, cooling and dust removal treatment and emission system for exhaust gas; the solid discharge port of the high efficiency solid-liquid separator 3 is connected with the feed port of the sludge dryer 10, and the steam outlet of sludge dryer 10 is connected with condensate recovery system 11;
the non-condensable gas outlet of the condensate recovery system 11 is connected to the high-temperature combustion oxidation system 9; the condensate outlet of the condensate recovery system 11 is connected to the oil-water separator 4; the solid discharge port of the sludge dryer 10 is connected with the thermal desorption feeding system 7, and the thermal desorption feed system 7 is connected to the thermal desorption system 8; the thermal desorption flue gas outlet 83 of the thermal desorption system 8 is connected to the flue gas inlet 91 of the high-temperature combustion oxidation system 9; the discharge port of the thermal desorption system 8 is connected to the discharge system, and the exhaust gas outlet 93 of the high-temperature combustion oxidation system 9 is connected to the waste heat boiler 13; the steam outlet of the waste heat boiler 13 is connected to the thermal chemical washing tank 2 and the sludge dryer 10; the tail gas outlet of the waste heat boiler is connected with the cooling and dust removal system for exhaust gas, then the treated tail gas is discharged to the atmosphere after being treated by the cooling and dust removal treatment system.
5. The method of claim 4 wherein the oil-water separator 4 of this disclosure is composed of a buffer tank 41, a reaction tank 42, an oil storage tank 44, and a water discharge tank 43; the buffer tank 41, the reaction tank 42, and the water discharge tank 43 are arranged in order; the oil storage tank 44 is located on the top of the reaction tank 42; the oil storage tank 44 is connected to the oil recovery tank 5, and the buffer tank 41 is connected to the liquid outlet of the high-efficiency solid-liquid separator 3.
6. The method of claim 5 wherein the thermal desorption feeding system 7 of this disclosure is composed of a feed silo 71, a belt conveyor 72 and a metering feed hopper 73;
the feed silo 71 is at the inlet of the belt conveyor 72, and the metering feed hopper 73 is at the outlet of the belt conveyor 72; the outlet of the metering feed hopper 73 is connected with the inlet of the thermal desorption system 8.
the feed silo 71 is at the inlet of the belt conveyor 72, and the metering feed hopper 73 is at the outlet of the belt conveyor 72; the outlet of the metering feed hopper 73 is connected with the inlet of the thermal desorption system 8.
7. The method of claim 4 or claim 5 wherein the thermal desorption system 8 of this disclosure comprises a refractory-coated thermal desorption chamber, a series of thermal desorption burners 82 mounted on top of the thermal desorption chamber, and a stainless steel crawler conveyor belt 81 below the thermal desorption burner 82; the thermal desorption chamber has a feeding inlet at one end, a discharge propeller 84 at the other end, and a thermal desorption flue gas outlet 83 at the top.
8. The method of claim 4 or claim 5 wherein the high-temperature combustion oxidation system 9 of this invention comprises a high-temperature combustion chamber;
one end of the high-temperature combustion chamber is set with a flue gas inlet 91 and a high-temperature burner 92, and the other end is provided with exhaust gas outlet 93 which is connected to the waste heat boiler 13.
one end of the high-temperature combustion chamber is set with a flue gas inlet 91 and a high-temperature burner 92, and the other end is provided with exhaust gas outlet 93 which is connected to the waste heat boiler 13.
9. The method of claim 4 or claim 5 wherein the cooling and dust removal treatment system for exhaust gas of this invention comprises a quench tower 14, a spray tower 15, a settling tower 16, an induced draft fan 17, and a chimney 18; the spray tower 15 is connected with the settling tower 16, and the quench tower 14 is connected to the spray tower 15; the outlet of the settling tower 16 is connected to the chimney 18 with a pipe with the induced draft fan 17 mounted on.
10. The method of claim 4 or claim 5 wherein the discharge system of this disclosure is composed of a discharge hopper 19, a double helix discharge machine 20, and a discharge silo 21; the discharge hopper 19 is located at the inlet of the double helix discharge machine 20, and the discharge silo 21 is located at the outlet of the double helix discharge machine 20; the outer layer of the double helix discharge machine 20 is wrapped with a layer of cooling water;
the top of the discharge silo 21 set a spraying device to reduce the temperature and dust of the dregs in the silo.
the top of the discharge silo 21 set a spraying device to reduce the temperature and dust of the dregs in the silo.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811001871.X | 2018-08-30 | ||
| CN201811001871.XA CN108996859B (en) | 2018-08-30 | 2018-08-30 | High-concentration petroleum sludge green cleaning-thermal desorption integrated technology treatment method and treatment system |
| PCT/CN2018/000319 WO2020041917A1 (en) | 2018-08-30 | 2018-09-12 | Green cleaning-thermal desorption integrated technology treatment method and system for high-concentration petroleum sludge |
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| Country | Link |
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| CA (1) | CA3090902A1 (en) |
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- 2018-08-30 CN CN201811001871.XA patent/CN108996859B/en active Active
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- 2018-09-12 WO PCT/CN2018/000319 patent/WO2020041917A1/en active Application Filing
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| CN112573790A (en) * | 2020-11-04 | 2021-03-30 | 北京华盛坤泰环境科技股份有限公司 | Harmless treatment method and system for oily sludge |
| CN115010204A (en) * | 2022-06-02 | 2022-09-06 | 河南省地质调查院 | Extraction technology-based underground water pumping treatment equipment and treatment method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108996859B (en) | 2020-12-11 |
| WO2020041917A1 (en) | 2020-03-05 |
| CN108996859A (en) | 2018-12-14 |
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