Oily wastewater and waste oil sludge recovery treatment system

Abstract

The invention discloses an oil-containing wastewater and waste oil sludge recovery treatment system which comprises an oil-containing wastewater pretreatment system and a waste oil sludge recovery treatment system, and the oil-containing wastewater pretreatment system comprises an oil separation tank, an emulsion storage tank, a PH regulating tank and an evaporator; the waste oil sludge recovery treatment system comprises a cracking furnace, an oil-gas settling tank, a condenser and an oil-water separator, oil residues are pumped into the cracking furnace, particle impurities are separated out from oil-gas mixed gas through the oil-gas settling tank, and oil-water separation is performed after the oil-gas mixed gas is cooled through the condenser. According to the resource recycling method disclosed by the invention, classified recycling of the oil-containing wastewater and the waste oil sludge is realized; efficient and environment-friendly recycling treatment of iron-containing separated oil and waste oil and recycling and harmless treatment of the waste emulsion are achieved, secondary pollution is avoided, and thorough treatment of the waste emulsion can be achieved; automatic control and modular design can be achieved, the occupied area is small, construction in a waste production unit field can be achieved, and the risk of dangerous waste transportation and treatment flow management is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of waste recycling, in particular to a system for recycling and treating oily wastewater and waste oil sludge. Background Art

[0002] Oily iron scale is a kind of iron oxide scraps that fall off the surface of the steel billet during rolling or heat treatment. It is usually mixed with roller lubricating oil, grease and rack cooling water to form a mixed slurry. At present, the existing iron scale treatment processes are divided into two categories. One is to prepare iron scale into chemical products, permanent magnetic materials, iron-based pigments, etc., but both require deep degreasing and dehydration of oily iron scale. This treatment process is easy to cause secondary pollution to water sources. Another type of treatment process is to remove iron scale from liquid slurry and use it directly in sintering ingredients, but the 2-5% oil contained in iron scale will be enriched on the fan, impeller and dust collector, affecting the normal operation of production equipment. In addition, the dioxin produced by the combustion of oily iron scale during the sintering process is also the main source of dioxin emission from sintering flue gas, which will cause serious pollution to the environment. In addition, the waste hydraulic oil, lubricating oil, grinding fluid, etc. used in the steel rolling process have not been recycled, and long-term stacking causes pollution and damage to the environment.

[0003] There is no relevant system in the existing technology that can recycle oily wastewater and waste oil sludge, which does not meet the needs of green production. Summary of the invention

[0004] The technical problem to be solved by the present invention is: to overcome the defects of the above-mentioned prior art and provide a system for recycling and treating oily wastewater and waste oil sludge, which solves the technical problem that oily wastewater and waste oil in the prior art cannot be recycled and does not meet the needs of green production, and realizes efficient and environmentally friendly recycling and treatment of iron and waste oil. At the same time, the flue gas generated by the combustion of the system is discharged into the air after dust removal treatment and meets the standards, which has the technical effects of high efficiency, environmental protection and low cost.

[0005] The technical solution adopted by the present invention to solve the technical problem is: an oily wastewater and waste oil sludge recovery and treatment system, including an oily wastewater pretreatment system and a waste oil sludge recovery and treatment system.

[0006] The oily wastewater pretreatment system comprises a grease trap, an emulsion storage tank, a pH adjustment tank and an evaporator. The oily wastewater enters the emulsion storage tank for buffering after the surface floating oil is initially removed in the grease trap. Depending on the water quality, low-concentration wastewater is pumped to the pH adjustment tank to further remove the surface floating oil and suspended matter, and then enters the evaporator for evaporation and concentration treatment. The effluent enters the comprehensive wastewater intermediate water tank for adjustment and homogenization. The high-concentration wastewater is pumped to the demulsification reaction tank for demulsification reaction. The demulsified wastewater removes the surface floating oil and adjusts the pH to enter the demulsification sedimentation tank for sedimentation. The upper clear liquid flows by gravity into the comprehensive wastewater intermediate water tank for adjustment and homogenization. The lower sludge is pumped to the organic sludge tank for sludge concentration treatment.

[0007] The waste oil sludge recovery and treatment system comprises a cracking furnace, an oil and gas settling tank, a condenser, and an oil-water separator. Semi-solid or liquid oil residue is directly pumped into a pyrolysis furnace through an oil residue pump. The oil and gas mixed gas is separated into particulate impurities through an oil and gas settling tank, and then enters an oil-water separator for oil-water separation after being cooled by a condenser. The oily wastewater is sent to a sewage station for treatment through a factory sewage pipe network. The separated rough pool enters an oil storage tank for collection and then is sent to a waste mineral oil raw material buffer tank for subsequent vacuum distillation. The non-condensable gas coming out of the condenser is introduced into a heating furnace for combustion after being water-sealed. The oil sludge residue in the pyrolysis furnace is discharged after being carbonized at high temperature. The carbonized slag is input into a carbonized slag material after heat exchange and cooling. The carbonized slag is crushed by a vibrating screen, and then iron oxide is separated from the powder, and the iron oxide is recycled and reused. The remaining slag is made into bricks.

[0008] Furthermore, the oily wastewater passes through a mechanical screen and enters a grease trap.

[0009] Furthermore, the evaporator is a JPHJ-R combined evaporator.

[0010] Furthermore, the pH adjusting tank adjusts the pH by adding sulfuric acid.

[0011] Furthermore, the temperature inside the cracking furnace is indirectly supplied by the heating furnace burning natural gas outside the furnace, and the temperature inside the furnace can reach 350°C.

[0012] Furthermore, the natural gas usage is 150m 3 / h.

[0013] Furthermore, the oil sludge residue in the pyrolysis furnace is discharged through a fully enclosed automatic slag discharging system of the pyrolysis furnace after high-temperature carbonization.

[0014] Furthermore, the discharged carbonized slag is fed into the carbonized slag silo through a screw conveyor after being cooled by heat exchange.

[0015] The oily wastewater and waste oil sludge recovery and treatment system of the present invention has the following beneficial effects:

[0016] 1. The resource recovery method of the present invention realizes the classified recovery of oily wastewater and waste oil sludge;

[0017] 2. The present invention realizes the efficient and environmentally friendly recycling of iron-containing oil and waste oil, the resource utilization and harmless disposal of waste emulsion, without secondary pollution, and can realize the thorough treatment of waste emulsion;

[0018] 3. The present invention can realize automatic control and modular design, occupies a small area, can be built on the site of waste-producing units, and reduce the risks of hazardous waste transportation and treatment flow management. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; DETAILED DESCRIPTION

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0022] Oily wastewater and waste oil sludge recovery and treatment system, including oily wastewater pretreatment system and waste oil sludge recovery and treatment system,

[0023] The oily wastewater pretreatment system comprises a grease trap, an emulsion storage tank, a pH adjustment tank and an evaporator. The oily wastewater enters the emulsion storage tank for buffering after the surface floating oil is initially removed in the grease trap. Depending on the water quality, low-concentration wastewater is pumped to the pH adjustment tank to further remove the surface floating oil and suspended matter, and then enters the evaporator for evaporation and concentration treatment. The effluent enters the comprehensive wastewater intermediate water tank for adjustment and homogenization. The high-concentration wastewater is pumped to the demulsification reaction tank for demulsification reaction. The demulsified wastewater removes the surface floating oil and adjusts the pH to enter the demulsification sedimentation tank for sedimentation. The upper clear liquid flows by gravity into the comprehensive wastewater intermediate water tank for adjustment and homogenization. The lower sludge is pumped to the organic sludge tank for sludge concentration treatment.

[0024] The waste oil sludge recovery and treatment system comprises a cracking furnace, an oil and gas settling tank, a condenser, and an oil-water separator. Semi-solid or liquid oil residue is directly pumped into a pyrolysis furnace through an oil residue pump. The oil and gas mixed gas is separated into particulate impurities through an oil and gas settling tank, and then enters an oil-water separator for oil-water separation after being cooled by a condenser. The oily wastewater is sent to a sewage station for treatment through a factory sewage pipe network. The separated rough pool enters an oil storage tank for collection and then is sent to a waste mineral oil raw material buffer tank for subsequent vacuum distillation. The non-condensable gas coming out of the condenser is introduced into a heating furnace for combustion after being water-sealed. The oil sludge residue in the pyrolysis furnace is discharged after being carbonized at high temperature. The carbonized slag is input into a carbonized slag material after heat exchange and cooling. The carbonized slag is crushed by a vibrating screen, and then iron oxide is separated from the powder, and the iron oxide is recycled and reused. The remaining slag is made into bricks.

[0025] The oily wastewater passes through a mechanical grille and enters the grease trap.

[0026] The evaporator is a JPHJ-R combined evaporator.

[0027] The pH adjusting tank adjusts the pH by adding sulfuric acid.

[0028] The temperature in the cracking furnace is indirectly supplied by the heating furnace burning natural gas outside the furnace. The temperature in the furnace can reach 350°C. The natural gas usage is 150m 3 / h.

[0029] The oil sludge residue in the pyrolysis furnace is discharged through a fully enclosed automatic slag discharging system of the pyrolysis furnace after high-temperature carbonization, and the discharged carbonized slag is fed into a carbonized slag silo through a screw conveyor after heat exchange cooling.

[0030] The process flow of oily wastewater pretreatment is briefly described as follows:

[0031] After the oily wastewater is initially removed from the surface floating oil in the oil separator and enters the collection tank for buffering, depending on the water quality, the low-concentration wastewater is pumped to the oil separator flotation tank for further removal of surface floating oil and suspended matter, and then enters the JPHJ-R combined evaporator for evaporation and concentration treatment, and the effluent enters the comprehensive wastewater intermediate water tank for adjustment and homogenization; the high-concentration wastewater is pumped to the demulsification reaction tank for demulsification reaction, and the pH of the wastewater after demulsification is adjusted to remove the surface floating oil and enter the demulsification sedimentation tank for sedimentation. The supernatant flows by gravity into the comprehensive wastewater intermediate water tank for adjustment and homogenization, and the sludge in the lower layer of the demulsification sedimentation tank is pumped to the organic sludge tank for sludge concentration treatment.

[0032] The waste oil sludge treatment process is briefly described as follows:

[0033] (1) Loading

[0034] Semi-solid or liquid oil residue is directly pumped into the pyrolysis furnace through the oil residue pump; solid oil sludge is stored in barrels in the oil sludge storage room and loaded into the upper hopper by a crane. The oil sludge is poured directly into the hopper and transported to the thermal desorption feed port silo through a closed belt transport, and feed metering and feed control are carried out at the same time.

[0035] (2) Indirect heating and thermal desorption

[0036] The oil sludge is fed into the pyrolysis furnace through the feeding screw auger. The heat of the pyrolysis furnace comes from the heating furnace of the gas heating system, and then is transferred to the closed heating chamber under the action of blasting. The oil sludge is thermally cracked at high temperature. The temperature inside the oil sludge pyrolysis furnace is 350℃. The heating furnace burns natural gas, which is indirectly supplied outside the furnace. The fuel gas used by the burner is supplied from the natural gas pipeline outside the plant to the station. The natural gas usage is 150m 3 / h. At the same time, the non-condensable gas produced in the sludge pyrolysis furnace is used as auxiliary fuel for the burner. The flue gas produced by combustion is treated with double alkali desulfurization and dust removal and then discharged into the air after meeting the standards.

[0037] This process will produce non-condensable gas and wastewater from the exhaust gas treatment system.

[0038] (3) Analysis steam condensation

[0039] The oil-gas mixture is separated from the particle impurities by the sedimentation tank, and then cooled by the condenser and enters the oil-water separator for oil-water separation. The oily wastewater is sent to the sewage station for treatment through the factory sewage pipe network. The separated rough pool is collected in the oil storage tank and sent to the waste mineral oil raw material buffer tank for subsequent vacuum distillation. The non-condensable gas coming out of the condenser is introduced into the heating furnace for combustion after being confirmed by the water seal.

[0040] This process will produce non-condensable gas and wastewater.

[0041] (4) Carbonized slag discharge

[0042] The oil sludge residue in the pyrolysis furnace is discharged through the fully enclosed automatic slag discharging system of the pyrolysis furnace after high-temperature carbonization, and the carbonized slag after heat exchange cooling is input into the carbonized slag silo through a screw conveyor.

[0043] (5) Recycling of carbonized slag

[0044] The carbonized slag is crushed with a vibrating screen, and then the iron oxide is separated from the powder. The iron oxide is recycled and reused, and the remaining slag is made into bricks.

[0045] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. Oily wastewater and waste sludge recovery and treatment system, characterized by: Including oily wastewater pretreatment system and waste oil sludge recovery and treatment system, The oily wastewater pretreatment system comprises a grease trap, an emulsion storage tank, a pH adjustment tank and an evaporator. The oily wastewater enters the emulsion storage tank for buffering after the surface floating oil is initially removed in the grease trap. Depending on the water quality, low-concentration wastewater is pumped to the pH adjustment tank to further remove the surface floating oil and suspended matter, and then enters the evaporator for evaporation and concentration treatment. The effluent enters the comprehensive wastewater intermediate water tank for adjustment and homogenization. The high-concentration wastewater is pumped to the demulsification reaction tank for demulsification reaction. The demulsified wastewater removes the surface floating oil and adjusts the pH to enter the demulsification sedimentation tank for sedimentation. The upper clear liquid flows by gravity into the comprehensive wastewater intermediate water tank for adjustment and homogenization. The lower sludge is pumped to the organic sludge tank for sludge concentration treatment. The waste oil sludge recovery and treatment system comprises a cracking furnace, an oil and gas settling tank, a condenser, and an oil-water separator. Semi-solid or liquid oil residue is directly pumped into a pyrolysis furnace through an oil residue pump. The oil and gas mixed gas is separated into particulate impurities through an oil and gas settling tank, and then enters an oil-water separator for oil-water separation after being cooled by a condenser. The oily wastewater is sent to a sewage station for treatment through a factory sewage pipe network. The separated rough pool enters an oil storage tank for collection and then is sent to a waste mineral oil raw material buffer tank for subsequent vacuum distillation. The non-condensable gas coming out of the condenser is introduced into a heating furnace for combustion after being water-sealed. The oil sludge residue in the pyrolysis furnace is discharged after being carbonized at high temperature. The carbonized slag is input into a carbonized slag material after heat exchange and cooling. The carbonized slag is crushed by a vibrating screen, and then iron oxide is separated from the powder, and the iron oxide is recycled and reused. The remaining slag is made into bricks.

2. The oily wastewater and waste oil sludge recovery and treatment system according to claim 1 is characterized by: The oily wastewater passes through a mechanical grille and enters the grease trap.

3. The oily wastewater and waste oil sludge recovery and treatment system according to claim 1 is characterized by: The evaporator is a JPHJ-R combined evaporator.

4. The oily wastewater and waste oil sludge recovery and treatment system according to claim 1 is characterized by: The pH adjusting tank adjusts the pH by adding sulfuric acid.

5. The oily wastewater and waste oil sludge recovery and treatment system according to claim 1 is characterized by: The temperature inside the cracking furnace is indirectly supplied by the heating furnace burning natural gas outside the furnace, and the temperature inside the furnace can reach 350°C.

6. The oily wastewater and waste oil sludge recovery and treatment system according to claim 5 is characterized by: The natural gas usage is 150m 3 / h.

7. The oily wastewater and waste oil sludge recovery and treatment system according to claim 1 is characterized by: The oil sludge residue in the pyrolysis furnace is discharged through a fully enclosed automatic slag discharging system of the pyrolysis furnace after being carbonized at high temperature.

8. The oily wastewater and waste oil sludge recovery and treatment system according to claim 7 is characterized by: The discharged carbonized slag is cooled by heat exchange and then fed into the carbonized slag silo through a screw conveyor.

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