A cutting waste liquid filter residue treatment system and process

Abstract

The invention discloses a cutting waste liquid filter residue treatment system and a process for treating cutting waste liquid filter residue using the system. The treatment system comprises a filter residue crushing unit, a drying and dehydration unit, a thermal analysis unit, an oil and gas condensation unit, an oil and water conditioning unit, a centrifugal separation unit, a water treatment unit, a gas purification unit, a residue cooling unit and a residue solidification unit. The treatment process uses the treatment system to treat the cutting waste liquid filter residue to reduce harm to the environment.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental protection mechanical equipment, and in particular relates to a cutting waste liquid filter residue treatment system and process. Background Art

[0002] Oil-based cutting fluids are used as cooling lubricants in the cutting process of metals and their alloys. For example, the cutting fluids used in super-finishing in bearing factories are mainly kerosene with a small amount of machine oil added. After passing through the processed parts, they generally contain only solid impurities such as abrasive particles and chips. During use, you only need to separate the solid impurities to obtain clean cutting fluid.

[0003] At present, the domestic online purification of cutting fluid mainly focuses on two purification technologies: filtration and separation. The filtration method uses porous materials such as copper wire mesh, cloth mesh, foam plastic, etc. to make filters to remove impurities generated by cutting fluid in the workpiece. The separation method uses gravity sedimentation, inertial separation, magnetic separation and other devices to remove impurities generated by cutting fluid during work. The solid matter filtered or separated from the cutting fluid is the cutting waste filter residue.

[0004] Cutting waste liquid residue contains metal powder, waste oil, surfactants and other substances. In addition to the hazards of general oil-containing solid waste, due to the effect of surfactants, the machine oil is highly dispersed in water, which is easier for animals, plants and aquatic organisms to absorb. The surfactants themselves are also harmful to organisms and can dissolve some toxic substances that are insoluble in water. In order to improve the rust resistance of the emulsion in the cutting fluid, the added sodium nitrite is easily converted into carcinogenic nitrosamines. If these waste liquids are not treated in time and discharged directly, they will cause serious environmental pollution.

[0005] At present, the annual consumption of metal cutting fluid in my country is about 800,000 tons, of which water-based metal cutting fluid and oil-based metal cutting fluid each account for about 50%. With the rapid development of modern machinery manufacturing industry, cutting fluid has been widely used in mechanical processing, and the consumption has increased rapidly, and the corresponding cutting waste fluid residue has also increased year by year. However, since cutting fluid and cutting waste fluid residue will cause pollution and damage to the environment and human body, cutting fluid and residue have been listed in the "National Hazardous Waste List", and their treatment and disposal process is subject to increasingly strict supervision. Summary of the invention

[0006] In view of this, the main purpose of the present invention is to provide a cutting waste liquid filter residue treatment system, so as to utilize the cutting waste liquid filter residue harmless treatment system and process to treat the cutting waste liquid filter residue and reduce its harm to the environment.

[0007] The present invention discloses a cutting waste liquid filter residue treatment system, which comprises a filter residue crushing unit, a drying and dehydration unit, a thermal analysis unit, an oil and gas condensation unit, an oil and water conditioning unit, a centrifugal separation unit, a water treatment unit, a gas purification unit, a residue cooling unit and a residue solidification unit.

[0008] The filter residue crushing unit comprises a crusher, a vibrating screen and a feeder connected in sequence;

[0009] The drying and dehydration unit comprises a drying and dehydration device, a steam condensation device and a flue gas purification device, wherein the steam outlet and the flue gas outlet of the drying and dehydration device are respectively connected to the steam inlet of the steam condensation device and the flue gas inlet of the flue gas purification device; the discharge port of the feeder is connected to the solid feed port of the drying and dehydration device;

[0010] The thermal analysis unit comprises a thermal analysis device and a combustion furnace, wherein the high-temperature flue gas inlet of the thermal analysis device is connected to the high-temperature flue gas outlet of the combustion furnace, the high-temperature flue gas outlet of the thermal analysis device is connected to the flue gas inlet of the drying and dehydration device, and the high-temperature oil and gas outlet of the thermal analysis device is connected to the high-temperature oil and gas inlet of the oil and gas condensation unit respectively; the total slag outlet of the thermal analysis device is connected to the solid inlet of the residue cooling unit; the liquid outlet of the steam condensation device is connected to the liquid inlet of the combustion furnace; the air outlet and the solid outlet of the residue cooling unit are connected to the air inlet of the combustion furnace and the solid inlet of the residue solidification unit respectively; the solid outlet of the drying and dehydration device is connected to the solid inlet of the thermal analysis device;

[0011] The gas outlet of the oil-gas condensing unit is connected to the gas inlet of the gas purification unit, and its liquid outlet is connected to the liquid inlet of the oil-water conditioning unit; the gas outlet of the gas purification unit is connected to the gas inlet of the combustion furnace;

[0012] The reagent inlet and liquid outlet of the oil-water conditioning unit are respectively connected to the reagent outlet of the dosing unit and the liquid inlet of the centrifugal separation unit;

[0013] The water inlet of the water treatment unit is connected to the liquid outlets of the centrifugal separation unit and the steam condensation device respectively, and the water outlet is connected to the water inlet of the oil and gas condensation unit.

[0014] As described above, the filter residue crushing unit is used to crush, screen and measure the filter residue of the cutting waste liquid, and then it is sent to the drying and dehydration device for dehydration. The steam generated by evaporation is liquefied by the steam condensation device, and the condensed water after liquefaction is sent to the water treatment unit for purification and recovery. The purified water is provided to the oil and gas condensation unit as circulating water; the non-condensable gas in the steam is sent to the combustion furnace for combustion, and the generated flue gas is successively used as the heat source of the thermal analysis device and the drying and dehydration device; the dehydrated filter residue is sent to the thermal analysis device for further dehydration, organic matter is evaporated and cracked to produce a high-temperature oil and gas mixture, which is liquefied by the oil and gas condensation unit to obtain non-condensable gas and oil-water compounds, and the non-condensable gas is passed through the gas The oil and water compounds are sent to the oil-water conditioning unit for decomposition of oil and water under the action of the agent, and further separated by the centrifugal separation unit, the water phase is sent to the water treatment unit for purification and recovery, the oil phase is sent to the combustion furnace for combustion, the residue after pyrolysis is sent to the residue cooling unit for cooling and then sent to the residue solidification unit together with the curing agent for harmless treatment of heavy metals in the residue. In this way, the system not only treats the cutting waste liquid filter residue and makes it harmless, but also recovers and treats the intermediate products in the treatment process, and makes full use of the products after the intermediate products are treated, so that the whole treatment process is harmless to the environment.

[0015] Preferably, the drying and dehydration device is a multi-layer jacketed indirect heating reactor, the outer jacket is a flue gas channel, and the flue gas inlet and outlet are respectively provided at both ends of the flue gas channel. The solid outlet is provided at the lower part of the terminal heating reactor, and an air collecting chamber is provided at the upper part of the heating reactor, and the steam outlet is provided on the air collecting chamber. A hollow paddle propeller is provided inside the heating reactor, and a wear-resistant baffle is provided on the hollow paddle propeller.

[0016] As described above, the crushed cutting waste liquid filter residue enters the heating reactor through the solid inlet of the drying and dehydrating device, and the flue gas enters through the flue gas inlet at the end of the outer jacket, indirectly heating the cutting waste liquid filter residue in the heating reactor, and under the propulsion of the hollow blade propeller arranged inside the heating reactor, the cutting waste liquid filter residue is pushed forward while being stirred and heated, and the wear-resistant baffle arranged on the hollow blade propeller fully stirs the cutting waste liquid filter residue so that it is fully heated to evaporate the moisture therein.

[0017] Preferably, the thermal analysis device is a multi-stage multi-layer jacketed indirect heating reactor, the outer jacket is a high-temperature flue gas channel, and the two ends of the channel are provided with a high-temperature flue gas inlet and outlet. The heating reactor is provided with a double-screw propeller, and the double-screw propeller is provided with a wear-resistant baffle;

[0018] The solid inlet is arranged at the upper front end of the thermal analysis device, the main slag outlet is arranged at the lower end, and a gas collecting chamber is arranged at the upper part, and the high-temperature oil and gas outlet is arranged on the gas collecting chamber.

[0019] As described above, the cutting waste liquid filter residue after dehydration in the drying and dehydration device enters the heating reactor inside the thermal analysis device, and the high-temperature flue gas is passed into the external jacket to indirectly heat the cutting waste liquid filter residue in the reactor. Under the propulsion of the double-screw propeller inside the heating reactor, the double-screw propeller rotates and propels forward at the same time. The wear-resistant baffle plate arranged on the double-screw propeller can fully stir the cutting waste liquid filter residue so that it is heated evenly. The heating reactor is arranged in multiple sections, so that the cutting waste liquid filter residue can be further evaporated and dehydrated in the front section of the heating reactor, the organic matter can be evaporated in the middle section, and the filter residue can be cracked in the last section.

[0020] Preferably, a deflector baffle is provided in the outer jacket.

[0021] From the above, a baffle is arranged in the outer jacket to increase the time that the flue gas stays in the flue gas channel, increase the heating time of the filter residue in the heating reactor, and improve the heating efficiency.

[0022] A process for treating waste cutting liquid residue using the system as described above comprises:

[0023] Step 1: The waste cutting liquid residue is crushed by a crusher (11), screened and weighed by a vibrating screen and a weighing scale (12), and then sent to a drying and dehydrating device (21) for dehydration through a feeder (13);

[0024] Step 2: The crushed waste cutting liquid residue is heated and dehydrated by the flue gas from the thermal analysis device (31) in the drying and dehydration device (21), and the steam generated by evaporation enters the steam condensation device (23) for liquefaction and cooling, and the condensed water after liquefaction is sent to the water treatment unit (8) for purification; the dehydrated waste cutting liquid residue enters the thermal analysis device (31) for pyrolysis, and the remaining flue gas enters the flue gas purification device (22) for purification;

[0025] Step 3: The high-temperature flue gas generated by the combustion of the preheated air from the residue cooling unit (9) and the clean gas from the gas purification unit (5) in the combustion furnace (32) is introduced into the thermal analysis device (31), and the cutting waste liquid filter residue in the heating reactor of the thermal analysis device (31) is pyrolyzed to obtain a high-temperature oil-gas mixture and solid residue. The flue gas after heat exchange in the thermal analysis device (31) enters the drying and dehydration device (21) to continue to indirectly heat the crushed cutting waste liquid filter residue. The flue gas after heat exchange in the drying and dehydration device (21) is cooled and purified by the flue gas purification device (22) and then discharged;

[0026] Step 4: the oil-gas mixture generated by pyrolysis in step 3 passes through the thermal analysis device (31) and enters the oil-gas condensation unit (4) for liquefaction and oil-liquid separation to obtain non-condensable gas and condensate containing oil-water compounds;

[0027] Step 5: The condensate produced in step 4 enters the oil-water conditioning unit (6) together with the agent for assisting the oil-water decomposition from the dosing unit for conditioning to decompose the oil and water, and then enters the centrifugal separation unit (7) for centrifugal separation of the oil and water phases. The separated water phase enters the water treatment unit (8) together with the condensed water from the steam condensation device (23) for purification and is sent to the oil-gas condensation unit (4) as circulating water, and the oil phase is sent to the combustion furnace (32) for combustion to generate flue gas for heating;

[0028] Step 6: After the non-condensable gas generated in step 4 is purified by the gas purification unit (5), it enters the combustion furnace (32) together with the non-condensable gas from the steam condensation device (23), and is burned with the preheated air from the residue cooling unit (9). The generated high-temperature flue gas is successively used as the heat source of the thermal analysis device (31) and the drying and dehydration device (21);

[0029] Step 7: The solid slag in step 3 is sent to the residue cooling unit (9) for cooling and then sent to the residue solidification unit (10) together with the solidifying agent to solidify the heavy metals in the solid slag.

[0030] From the above, through the above steps, the filter residue is processed into a harmless solid product and discharged, and the intermediate products generated in the process are also processed and utilized. For example, the generated non-condensable gas is sent to the combustion furnace for combustion, and the generated flue gas is used as a heat source for the thermal analysis device and the drying and dehydration device. The generated high-temperature oil and gas are separated into oil and water, and the water phase and the oil phase are purified, recycled and burned respectively. The filter residue generated after pyrolysis is solidified to make the heavy metals therein harmless to the environment.

[0031] Preferably, the temperature of the flue gas from the thermal analysis device (31) in step 2 is in the range of 90°C to 120°C.

[0032] Preferably, in step 3, the temperature range of the preheated air from the residue cooling unit (9) is 100-200°C, the temperature of the high-temperature flue gas generated by the combustion of the clean gas and the preheated air in the combustion furnace (32) is 600-800°C, the temperature range of the flue gas after heat exchange in the thermal analysis device is 380-450°C, and the temperature of the flue gas after heat exchange in the drying and dehydration device is below 200°C.

[0033] Preferably, the cutting waste liquid filter residue needs to be heated to 300-600°C for pyrolysis in step 3. Before the pyrolysis reaction, the cutting waste liquid filter residue is further dehydrated at 120-150°C in the multi-stage heating reactor of the thermal analysis device, and the organic matter in the cutting waste liquid filter residue is evaporated at 150-400°C.

[0034] Preferably, the temperature of the non-condensable gas and the condensate containing oil and water compounds obtained in step 4 is 60-80°C;

[0035] The temperature range of the preheated air of the residue cooling unit in step 6 is 100-200°C, and the temperature of the high-temperature flue gas generated by the combustion of the non-condensable gas and the preheated air is 600-800°C.

[0036] Preferably, the temperature of the residue produced by pyrolysis in the thermal analysis device in step 7 is 400-500°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a connection schematic diagram of a cutting waste liquid slag treatment system. DETAILED DESCRIPTION

[0038] Figure 1 It is a connection schematic diagram of a cutting waste liquid filter residue treatment system, including a filter residue crushing unit 1, a drying and dehydration unit 2, a thermal analysis unit 3, an oil and gas condensation unit 4, a gas purification unit 5, an oil and water conditioning unit 6, a centrifugal separation unit 7, a water treatment unit 8, a residue cooling unit 9, a residue solidification unit 10 and a dosing unit.

[0039] The filter residue crushing unit 1 includes a crusher 21, a vibrating screen and a weighing scale 22 and a feeder 23 which are connected in sequence. The solid discharge port 131 of the feeder 23 is connected to the solid feed port 211 of the drying and dehydration device 21 through a pipeline; the cutting waste liquid filter residue enters the silo and is transported to the crusher 21 for crushing. The crushed cutting waste liquid filter residue is screened by the vibrating screen and then weighed by the weighing scale, which is convenient for controlling the weight of the processed filter residue and preventing too much filter residue from entering the subsequent equipment and exceeding the processing capacity of the equipment. Then, the spiral mechanism of the feeder 23 sends it to the drying and dehydration device for dehydration;

[0040] The drying and dehydration unit 2 includes a drying and dehydration device 21, a flue gas purification device 22 and a steam condensation device 23; the drying and dehydration device 21 is a multi-layer jacketed indirect heating reactor, on which a solid feed port 211 is provided, and the crushed cutting fluid filter residue is transported from the solid discharge port 131 of the feeder 13 through a conveying pipeline through the solid feed port 211 into the drying and dehydration device 21 for heating and dehydration; a solid outlet 213 is also provided at the bottom of the terminal reactor, and the solid outlet 213 is connected to the solid inlet 314 of the thermal analysis device 31; the outer jacket is a flue gas The channel has a smoke inlet 215 and a smoke outlet 214 at both ends thereof, which are connected to the smoke outlet 312 of the thermal analysis device 31 and the smoke inlet of the smoke purification device 22 respectively. The smoke discharged from the thermal analysis device 31 enters the drying and dehydration device 21 through the smoke inlet 215, and after heating and dehydrating the cutting fluid filter residue, enters the smoke purification device through the smoke outlet 214 of the drying and dehydration device 21 to purify the smoke. A gas collecting chamber is provided on the upper part of the heating reactor of the drying and dehydration device 21, and a steam outlet 212 is provided on the gas collecting chamber. The steam outlet 21 2 is connected to the steam inlet 231 of the steam condensing device 23. The steam generated by the drying and dehydrating device 21 after heating the cutting fluid filter residue enters the steam condensing device 23 for liquefaction treatment. The steam contains a small amount of dry gas, which needs to be sent to the combustion furnace 32 for combustion after liquefaction. The condensed water liquefied in the steam condensing device 23 is sent to the water treatment unit 8 for purification treatment, and then sent to the oil and gas condensing unit 4 as circulating water to mix with the liquefied oil and gas to form an oil-water mixture; a hollow blade propeller is provided inside the heating reactor, on which a wear-resistant baffle is provided, from the pyrolysis The flue gas discharged from the analysis device 31 enters the outer jacket through the flue gas inlet 215, and the heat in the flue gas indirectly heats the filter residue through the heat medium channel arranged inside the heating reactor. When the hollow blade propeller rotates, the wear-resistant baffle thereon stirs the crushed cutting fluid filter residue to make it evenly and fully heated. The hollow blade propeller pushes the cutting fluid filter residue forward while rotating, and the steam evaporated from the filter residue enters the steam condensation device through the steam outlet 212 for liquefaction. The dehydrated filter residue enters the thermal analysis device 31 for thermal decomposition under the continuous forward propulsion of the hollow blade propeller.

[0041] The thermal analysis unit 3 includes a thermal analysis device 31 and a combustion furnace 32. The thermal analysis device 31 is a multi-stage jacketed indirect heating reactor. The lower part of the terminal heating reactor of the thermal analysis device 31 is provided with a total slag outlet 313, and the total slag outlet 313 is connected to the residue inlet 91 of the residue cooling unit 9 through a conveying device; each section of the heating reactor of the thermal analysis device 31 is provided with a gas collecting chamber, and the gas collecting chamber is respectively provided with a high-temperature oil and gas outlet 315, and each high-temperature oil and gas outlet 315 is connected to the air inlet of the oil and gas condensation unit 4 through a pipeline. 41; the thermal analysis device 31 is also provided with a high-temperature flue gas inlet 311 connected to the high-temperature flue gas outlet 321 of the combustion furnace 32, and a flue gas outlet 312 connected to the flue gas inlet 215 of the drying and dehydration device 21 through a pipeline; a double-screw propeller is provided inside the heating reactor, and a wear-resistant baffle is provided on the double-screw propeller, which is used as a blade for stirring, and the outer jacket is a high-temperature flue gas channel, and a baffle is provided in the flue gas channel to increase the residence time of the flue gas in the flue, improve the heating effect, and A high-temperature flue gas inlet 311 and a flue gas outlet 312 are respectively provided at both ends; when the double-screw propeller rotates, the wear-resistant baffle arranged thereon stirs the dehydrated cutting fluid filter residue entering the heater of the thermal analysis device 31, and the high-temperature flue gas generated by the combustion furnace 32 is passed into the outer jacket of the thermal analysis device 31, and the filter residue is indirectly heated through the heat medium channel arranged inside the heater. The double-screw propeller rotates and stirs while continuously pushing the filter residue forward. In the initial stage of the heater, the cutting fluid filter residue is heated and further dehydrated, and the heated organic matter evaporates in the middle stage. As the double-screw propeller continues to advance, the filter residue in the rear section of the heater is cracked to produce a high-temperature oil-gas mixture that enters the oil-gas condensation unit 4 through the top pipeline for cooling. The residue produced after pyrolysis enters the residue cooling unit 9 for cooling, and then enters the residue solidification unit 10 together with the curing agent to solidify the heavy metals in the residue to make it harmless to the environment. The remaining flue gas enters the drying and dehydration device 21 to heat and dehydrate the cutting fluid filter residue.

[0042] The oil and gas condensing unit 4 is connected to the thermal analysis device 3, the oil-water conditioning unit 6 and the water treatment unit 8 respectively. The high-temperature oil and gas generated by the thermal analysis device 31 and the circulating water treated by the water treatment unit 8 enter the oil and gas condensing unit 4 together for liquefaction and cooling to obtain non-condensable gas and condensate. The condensate is an oil-water mixture. The dosing unit 11 adds the auxiliary oil-water separation agent and the condensate to the oil-water conditioning unit 6 for conditioning to decompose the oil and water. The decomposed oil-water mixture enters the centrifugal separation unit 7 to separate the oil and water. The separated oil phase is sent to the combustion furnace 3 for combustion, and the separated water phase is sent to the water treatment unit 8 for purification. The non-condensable gas generated by the oil and gas condensing unit 4 enters the gas purification unit 5 for purification. The gas purification unit 5 is connected to the combustion furnace 32. The purified non-condensable gas is sent to the combustion furnace 32 for combustion together with the non-condensable gas (dry gas) generated by the steam condensing device 23. The generated flue gas is used as the heat source of the thermal analysis device 31 and the drying and dehydration device 21 respectively.

[0043] The working principle of the harmless treatment system for cutting waste liquid residue is as follows:

[0044] The waste cutting liquid residue in the silo is crushed by the crusher 11, screened and weighed by the vibrating screen and the weighing scale 12, and then sent to the feeder 13, and then sent to the drying and dehydrating device 21 for dehydration through the conveying device. The flue gas conveyed by the thermal analysis device 31 heats the crushed waste cutting liquid residue to evaporate the water in the waste cutting liquid residue into water vapor, and the water vapor containing a small amount of dry gas is sent to the steam condensing device 23 for liquefaction and cooling treatment. The liquefied dry gas is sent to the combustion furnace 32 for combustion, and the water vapor is liquefied and becomes condensed water and is sent to the water treatment unit 8 for purification treatment; the flue gas passes through the drying and dehydrating device 21 to heat the residue and then enters the flue gas purification device 22 for purification treatment; the dehydrated waste cutting liquid residue is transported to the heater of the thermal analysis device 31 under the action of the hollow blade propeller, and the high-temperature flue gas generated by the combustion furnace 32 is passed into the outer jacket of the thermal analysis device 31 to indirectly heat the dehydrated waste cutting liquid residue. The oil and gas are heated under anaerobic conditions in the section heater, and undergo further dehydration in the heater of the initial section, evaporation of organic matter in the middle section heater, cracking in the final section heater and other reactions to obtain high-temperature oil and gas and residue. The residue enters the residue cooling unit 9 for cooling, and then enters the residue solidification unit 10 together with the solidifying agent to solidify the heavy metals in the residue to make it harmless to the environment; the high-temperature oil and gas produced by the cracking are sent to the oil and gas condensation unit 4 together with the circulating water in the water treatment unit 8, and the high-temperature oil and gas are liquefied and cooled to form an oil-water mixture with the circulating water, and then are sent to the oil-water conditioning unit 6 together with the oil-water auxiliary decomposition agent sent from the dosing unit 11 for oil-water decomposition, and then enter the centrifugal separation unit 7 to separate the oil and water, the separated oil phase is sent to the combustion furnace 23 for combustion, and the separated water phase is sent to the water treatment unit 8 for purification; the non-condensable gas produced after the liquefaction of the oil and gas condensation unit 4 is sent to the gas purification unit 5 for purification, and then sent to the combustion furnace 32 for combustion to produce flue gas.

[0045] A process for treating cutting waste liquid filter residue using the above-mentioned cutting waste liquid filter residue harmless treatment system, the process comprising the following steps:

[0046] Step 1: The waste liquid residue from cuttings enters the silo and is transported to the crusher 11 of the crushing unit 1 for crushing. Then, it is screened and weighed by the vibrating screen and the weighing scale 12 and then sent to the drying and dehydration device 21 of the drying and dehydration unit 2 by the feeder 13 for dehydration.

[0047] Step 2: The waste cutting liquid residue is heated by the flue gas from the thermal analysis device 31 in the middle of the drying and dehydration device 21. When the furnace is started, natural gas is burned to generate flue gas. When the flue gas temperature rises to 90°C-120°C, the water content and a small amount of light components in the residue evaporate and precipitate into the steam condensation device 23 for liquefaction and cooling. The dehydrated waste cutting liquid residue enters the thermal analysis device 31 for pyrolysis, and the remaining flue gas enters the flue gas purification device 22 for purification;

[0048] Step 3: The preheated air (100-200°C) from the residue cooling unit 9 and the clean gas from the gas purification unit 5 are burned in the combustion furnace 32 to generate high-temperature flue gas of 600-800°C (there is no preheated air when the combustion furnace 32 is started, and natural gas needs to be burned to generate high-temperature flue gas). The high-temperature flue gas is passed into the outer jacket of the thermal analysis device 31 to indirectly heat and heat the cutting waste liquid filter residue in the heating reactor of the thermal analysis device 31. After heat exchange, the flue gas at 380-450°C enters the drying and dehydration device 21 to continue to indirectly heat the crushed cutting waste liquid filter residue. The flue gas is cooled to below 200°C by heat exchange and sent to the flue gas purification device for purification and then discharged.

[0049] Step 4: The filter residue in the multi-stage heating reactor of the thermal analysis device 31 is heated under anaerobic conditions, and is heated to 120-150°C for dehydration in the initial stage of the multi-stage heating reactor, heated to 150-400°C for evaporation of organic matter, and heated to 400-600°C for cracking. The generated oil-gas mixture enters the oil-gas condensation unit 4 through the top pipeline of the thermal analysis device 31 and is cooled to 60-80°C for liquefaction, thereby obtaining non-condensable gas and condensate containing oil-water compounds;

[0050] Step 5: The condensate produced in step 4 enters the oil-water conditioning unit 6 together with the agent for assisting the oil-water decomposition from the dosing unit for conditioning to decompose the oil and water, and then enters the centrifugal separation unit 7 for centrifugal separation of the oil-water two phases. After separation, the water phase enters the water treatment unit 8 together with the condensed water from the steam condensation device 23 for purification and is sent to the oil-gas condensation unit 4 as circulating water, and the oil phase is sent to the combustion furnace 32 to burn the flue gas to provide heat;

[0051] Step 6: The non-condensable gas generated in step 4 is purified by the gas purification unit 5, and then enters the combustion furnace 32 together with the non-condensable gas (dry gas) evaporated from the drying and dehydration device 21 and liquefied by the steam condensation device 23, and is burned with the 100-200°C preheated air from the residue cooling unit 9. The generated high-temperature flue gas of 600-800°C is used as the heat source of the thermal analysis device 31 and the drying and dehydration device 21 in turn;

[0052] Step 7: The 400-500°C residue generated by pyrolysis in the thermal analysis device 31 is sent to the residue cooling unit 9 for cooling and then sent to the residue solidification unit 10 together with the solidifying agent to solidify the heavy metals in the residue to ensure the harmless effect of the residue.

[0053] Furthermore, the process of treating the waste cutting liquid residue by using the above system is described below with a specific embodiment:

[0054] In step 1, after the vibrating screen and the weighing scale 2 screen and weigh, the material is sent to the drying and dehydrating device 21 for dehydration at a feeding rate of 500 kg / h by the feeder 13;

[0055] In step 2, the waste cutting liquid residue receives 400°C flue gas waste heat from the thermal analysis device 31 in the middle of the drying and dehydration device 21. When the temperature of the waste cutting liquid residue is gradually raised to 120°C under the stirring of the hollow blades of the heating reactor of the drying and dehydration device 21, the water content and a small amount of dry gas in the residue evaporate and precipitate into the steam condensation device 23, and the dehydrated solid matter enters the thermal analysis device 31;

[0056] In step 3, the 150°C preheated air from the residue cooling unit 9 and the clean gas from the gas purification unit 5 are burned in the combustion furnace 32 to generate 800°C high-temperature flue gas (the combustion furnace 32 burns natural gas to generate high-temperature flue gas when it starts). The high-temperature flue gas is passed into the jacket of the thermal analysis device 31 to indirectly heat and heat the filter residue in the heating reactor of the thermal analysis device 31. After heat exchange, the flue gas is 400°C and enters the drying and dehydration device 21 to continue heat exchange and cool down to below 200°C before being discharged.

[0057] In step 4, the filter residue in the multi-stage heating reactor of the thermal analysis device 31 is heated to 500°C under anaerobic conditions, undergoes dehydration at 150°C, organic matter evaporation at 380°C, and cracking at 500°C, and the resulting oil-gas mixture enters the oil-gas condensation unit 7 through the top pipeline to be cooled to 80°C, and non-condensable gas and condensate are obtained after separation;

[0058] In step 6, the non-condensable gas is purified by the gas purification unit 12, and then enters the combustion furnace 6 together with the non-condensable gas from the drying and dehydration device 4, and is combusted with the 150°C preheated air from the residue cooling unit 13. The generated 80°C high-temperature flue gas is used as a heat source for the thermal analysis device 5 and the drying and dehydration device 4 in turn;

[0059] In step 7, the 450° C. residue generated by pyrolysis in the thermal analysis device 31 is sent to the residue cooling unit 9 for cooling, and then sent to the residue solidification unit 10 together with the solidifying agent.

[0060] The residues after being treated by the process of treating the residues are harmless to the environment, and the products in the process of treating are also treated and all that can be used is used, and the whole process of treating does not cause harm to the environment.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A system for treating waste cutting liquid residue, comprising a residue crushing unit, a drying and dehydration unit, a thermal analysis unit, an oil and gas condensation unit, an oil and water conditioning unit, a centrifugal separation unit, a water treatment unit, a gas purification unit, a residue cooling unit, a residue solidification unit and a dosing unit, characterized in that: The filter residue crushing unit comprises a crusher, a vibrating screen and a feeder connected in sequence; The drying and dehydration unit comprises a drying and dehydration device, a steam condensation device and a flue gas purification device, wherein the steam outlet and the flue gas outlet of the drying and dehydration device are respectively connected to the steam inlet of the steam condensation device and the flue gas inlet of the flue gas purification device; the discharge port of the feeder is connected to the solid feed port of the drying and dehydration device; The thermal analysis unit comprises a thermal analysis device and a combustion furnace, wherein the high-temperature flue gas inlet of the thermal analysis device is connected to the high-temperature flue gas outlet of the combustion furnace, the high-temperature flue gas outlet of the thermal analysis device is connected to the flue gas inlet of the drying and dehydration device, and the high-temperature oil and gas outlet of the thermal analysis device is connected to the high-temperature oil and gas inlet of the oil and gas condensation unit respectively; the total slag outlet of the thermal analysis device is connected to the solid inlet of the residue cooling unit; the liquid outlet of the steam condensation device is connected to the liquid inlet of the combustion furnace; the air outlet and the solid outlet of the residue cooling unit are connected to the air inlet of the combustion furnace and the solid inlet of the residue solidification unit respectively; the solid outlet of the drying and dehydration device is connected to the solid inlet of the thermal analysis device; The gas outlet of the oil-gas condensing unit is connected to the gas inlet of the gas purification unit, and its liquid outlet is connected to the liquid inlet of the oil-water conditioning unit; the gas outlet of the gas purification unit is connected to the gas inlet of the combustion furnace; The reagent inlet and liquid outlet of the oil-water conditioning unit are respectively connected to the reagent outlet of the dosing unit and the liquid inlet of the centrifugal separation unit; The water inlet of the water treatment unit is connected to the liquid outlets of the centrifugal separation unit and the steam condensation device respectively, and the water outlet is connected to the water inlet of the oil and gas condensation unit.

2. The filter residue treatment system according to claim 1, characterized in that: The drying and dehydration device is a multi-layer jacketed indirect heating reactor, the outer jacket is a flue gas channel, and the flue gas inlet and outlet are respectively provided at both ends of the flue gas channel. The solid outlet is provided at the lower part of the terminal heating reactor, and an air collecting chamber is provided at the upper part of the heating reactor, and the steam outlet is provided on the air collecting chamber. A hollow paddle propeller is provided inside the heating reactor, and a wear-resistant baffle is provided on the hollow paddle propeller.

3. The filter residue treatment system according to claim 1, characterized in that: The thermal analysis device is a multi-stage multi-layer jacketed indirect heating reactor, the outer jacket is a high-temperature flue gas channel, the two ends of the channel are provided with the high-temperature flue gas inlet and outlet, the multi-stage multi-layer jacketed indirect heating reactor is provided with a double-screw propeller, and the double-screw propeller is provided with a wear-resistant baffle; The solid inlet is arranged at the upper front end of the thermal analysis device, the main slag outlet is arranged at the lower end, and a gas collecting chamber is arranged at the upper part, and the high-temperature oil and gas outlet is arranged on the gas collecting chamber.

4. The filter residue treatment system according to claim 3, characterized in that: A deflector baffle is arranged in the external jacket.

5. A process for treating cutting waste liquid residue using the system according to any one of claims 1 to 4, characterized in that: It includes: Step 1: The waste cutting liquid residue is crushed by a crusher (11), screened and weighed by a vibrating screen and a weighing scale (12), and then sent to a drying and dehydrating device (21) for dehydration through a feeder (13); Step 2: The crushed waste cutting liquid residue is heated and dehydrated by the flue gas from the thermal analysis device (31) in the drying and dehydration device (21), and the steam generated by evaporation enters the steam condensation device (23) for liquefaction and cooling, and the condensed water after liquefaction is sent to the water treatment unit (8) for purification; the dehydrated waste cutting liquid residue enters the thermal analysis device (31) for pyrolysis, and the remaining flue gas enters the flue gas purification device (22) for purification; Step 3: The high-temperature flue gas generated by the combustion of the preheated air from the residue cooling unit (9) and the clean gas from the gas purification unit (5) in the combustion furnace (32) is introduced into the thermal analysis device (31), and the cutting waste liquid filter residue in the thermal analysis device (31) is pyrolyzed to obtain a high-temperature oil-gas mixture and solid residue. The flue gas after heat exchange in the thermal analysis device (31) enters the drying and dehydration device (21) to continue to indirectly heat the crushed cutting waste liquid filter residue. The flue gas after heat exchange in the drying and dehydration device (21) is cooled and purified by the flue gas purification device (22) and then discharged; Step 4: the oil-gas mixture generated by pyrolysis in step 3 passes through the thermal analysis device (31) and enters the oil-gas condensation unit (4) for liquefaction and oil-liquid separation to obtain non-condensable gas and condensate containing oil-water compounds; Step 5: The condensate produced in step 4 enters the oil-water conditioning unit (6) together with the agent for assisting the oil-water decomposition from the dosing unit for conditioning to decompose the oil and water, and then enters the centrifugal separation unit (7) for centrifugal separation of the oil and water phases. The separated water phase enters the water treatment unit (8) together with the condensed water from the steam condensation device (23) for purification and is sent to the oil-gas condensation unit (4) as circulating water, and the oil phase is sent to the combustion furnace (32) for combustion to generate flue gas for heating; Step 6: After the non-condensable gas generated in step 4 is purified by the gas purification unit (5), it enters the combustion furnace (32) together with the non-condensable gas from the steam condensation device (23), and is burned with the preheated air from the residue cooling unit (9). The generated high-temperature flue gas is successively used as the heat source of the thermal analysis device (31) and the drying and dehydration device (21); Step 7: The solid slag in step 3 is sent to the residue cooling unit (9) for cooling and then sent to the residue solidification unit (10) together with the solidifying agent to solidify the heavy metals in the solid slag.

6. The process according to claim 5, characterized in that In step 2, the temperature of the flue gas from the thermal analysis device (31) is in the range of 90°C to 120°C.

7. The process according to claim 5, characterized in that In step 3, the temperature range of the preheated air from the residue cooling unit (9) is 100-200°C, the temperature of the high-temperature flue gas generated by the combustion of the clean gas and the preheated air in the combustion furnace (32) is 600-800°C, the temperature range of the flue gas after heat exchange in the thermal analysis device is 380-450°C, and the temperature of the flue gas after heat exchange in the drying and dehydration device is below 200°C.

8. The process according to claim 5, characterized in that In step 3, the cutting waste liquid filter residue needs to be heated to 300-600°C for pyrolysis. Before the pyrolysis reaction, the cutting waste liquid filter residue is further dehydrated at 120-150°C in the multi-stage heating reactor of the thermal analysis device, and the organic matter in the cutting waste liquid filter residue is evaporated at 150-400°C.

9. The process according to claim 5, characterized in that The temperature of the non-condensable gas and the condensate containing oil and water compounds obtained in step 4 is 60-80°C; The temperature range of the preheated air of the residue cooling unit in step 6 is 100-200°C, and the temperature of the high-temperature flue gas generated by the combustion of the non-condensable gas and the preheated air is 600-800°C.

10. The process according to claim 5, characterized in that The temperature of the residue produced by pyrolysis in the thermal analysis device in step 7 is 400-500°C.

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