Mvr evaporation concentration system for methanol-containing material

Abstract

This utility model relates to an MVR evaporation and concentration system for methanol-containing materials, including a material tank for storing materials, a feed pump for conveying materials, a material evaporation system for evaporating and concentrating materials, a water heater that uses secondary steam generated by the material evaporation system as a heat source to heat water and generate steam, a steam compressor for pressurizing and heating the steam generated by the water heater, a live steam source, a tail gas condenser, and a vacuum pump. This utility model uses the methanol-containing secondary steam generated during the evaporation process of methanol-containing materials as a heat source to heat water and generate pure steam. The pure steam enters the steam compressor and is compressed into high-pressure and high-temperature compressed steam. The compressed steam is used to evaporate and concentrate the methanol-containing materials. Live steam is only used as a supplementary heat source, which can effectively reduce the amount of live steam used, save costs, reduce the risk of methanol explosion, reduce the corrosion of the compressor's mechanical structure by methanol, and ensure the normal and stable operation of the system.

Description

Technical Field

[0001] This utility model relates to the field of evaporation and concentration equipment technology, specifically to an MVR evaporation and concentration system for methanol-containing materials. Background Technology

[0002] Methanol, the simplest saturated monohydric alcohol, is a colorless, transparent, volatile liquid with an alcoholic odor. Miscible with water and many organic solvents, it is a fundamental chemical raw material widely used in energy, pharmaceuticals, and agriculture. In the pharmaceutical and pesticide industries, methanol is used as a solvent or intermediate in drug production, dissolving active ingredients or synthesizing intermediates. This results in methanol being present in wastewater after drug production. For example, in vitamin C production, methanol is the primary reaction solvent in fermentation, extraction, and esterification processes, used for gulonic acid extraction, esterification, and conversion. In the synthesis of sodium vitamin C, methanol is used in the crystallization process and subsequent steps to aid in impurity removal and promote product purification. The production of Vitamin C generates a large amount of waste liquid, commonly referred to as VC waste liquid. This includes mother liquor from gulonic acid extraction, Vitamin C conversion mother liquor, and refining mother liquor. VC waste liquid contains useful substances such as Vitamin C, gulonic acid, sorbitol, polysaccharides, proteins, oxalic acid, and methanol. Direct discharge of VC waste liquid would cause serious environmental pollution, while direct wastewater treatment would result in resource waste. Therefore, technicians have developed various methods for the secondary utilization of VC waste liquid, such as recovering gulonic acid and oxalic acid, and using it to produce microbial protein and polypeptide organic fertilizers. However, due to the low concentration of VC waste liquid, all methods require prior evaporation and concentration.

[0003] Because VC waste liquid contains methanol, and methanol is a volatile substance, the methanol in the VC waste liquid will also evaporate during the evaporation and concentration process. This methanol will mix with the evaporated secondary vapor as gaseous methanol. Therefore, an MVR evaporator cannot be used for the evaporation and concentration of VC waste liquid. This is because:

[0004] 1. The saturated vapor pressure of methanol is much higher than that of water. During the compression process, when the secondary vapor and methanol gas are compressed together by the compressor, the methanol gas mixed in will liquefy first, while the secondary vapor is still in a superheated state. The liquefied droplets will impact the compressor impeller when the compressor is running, causing vibration or mechanical damage. At the same time, methanol can also easily cause corrosion damage to mechanical equipment.

[0005] 2. Methanol is a flammable substance and poses a certain risk of explosion. When the MVR steam compressor compresses the mixed gas, the temperature of the secondary steam will rise, which increases the possibility of methanol combustion and explosion.

[0006] Therefore, currently, when evaporating and concentrating methanol-containing materials, only multi-effect evaporators can be used, with live steam as the heat source. In this method, the secondary steam separated by the evaporator can only be discharged after washing and condensation. This method consumes a large amount of live steam, has high energy consumption, and is costly. Utility Model Content

[0007] In summary, to overcome the shortcomings of existing technologies, this utility model provides an MVR evaporation and concentration system for methanol-containing materials. It uses secondary steam containing methanol gas generated during the evaporation process of the methanol-containing material as a heat source to heat water, producing pure saturated steam. This pure saturated steam is then compressed into high-pressure, high-temperature compressed steam by a steam compressor. The compressed steam is used to evaporate and concentrate the methanol-containing material. Once the system stabilizes, live steam is only used as a supplementary heat source, effectively reducing the amount of live steam used, saving costs, reducing the risk of methanol explosion, minimizing methanol corrosion of the compressor's mechanical structure, and ensuring the normal and stable operation of the system.

[0008] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0009] An MVR evaporation and concentration system for methanol-containing materials includes:

[0010] The feeding device includes a material tank for storing methanol-containing materials and a feed pump whose inlet is connected to the material tank.

[0011] A material evaporation system is used to evaporate and concentrate methanol-containing materials. The system includes a second-effect evaporator, a first-effect evaporator, a third-effect evaporator, and a fourth-effect evaporator connected sequentially along the material flow direction. The first-effect and second-effect evaporators are both falling film evaporators, while the third-effect and fourth-effect evaporators are both forced circulation evaporators.

[0012] The inlet of the double-effect evaporator is connected to the outlet of the feed pump, and the outlet of the quadruple-effect evaporator is connected to the inlet of the discharge pump. The outlet of the discharge pump is connected to the concentrated slurry discharge pipeline.

[0013] A water evaporator uses secondary steam generated by a material evaporation system as a heat source to heat water and produce steam. The inlet of the water evaporator is connected to the secondary steam outlet of the material evaporation system.

[0014] The steam compressor compresses the steam generated by the water evaporator. The steam compressor's inlet is connected to the steam outlet of the water evaporator, and the steam compressor's outlet is connected to the inlet of the material evaporation system via a compressed steam pipeline.

[0015] A live steam source, which is connected to a compressed steam pipeline and the air supply port of a steam compressor via a live steam pipeline.

[0016] The exhaust gas condenser has its air inlet connected to the non-condensable gas outlet of the water evaporator, its water inlet connected to the cooling water inlet pipe, and its water outlet connected to the cooling water return pipe.

[0017] The vacuum pump's inlet is connected to the outlet of the exhaust gas condenser, and the vacuum pump's outlet is used for venting.

[0018] Furthermore, the double-effect evaporator uses the secondary steam separated from the first-effect evaporator as a heat source to evaporate and concentrate the material. The air inlet of the double-effect evaporator is connected to the secondary steam outlet of the first-effect evaporator, and the secondary steam outlet of the double-effect evaporator is connected to the air inlet of the water evaporator.

[0019] The single-effect evaporator, triple-effect evaporator, and quadruple-effect evaporator use compressed steam and / or live steam as heat sources to evaporate and concentrate materials. The air inlets of the single-effect evaporator, triple-effect evaporator, and quadruple-effect evaporator are all connected to the compressed steam pipeline, which is connected to the outlet of the steam compressor. The live steam source is connected to the compressed steam pipeline through the live steam pipeline. The secondary steam outlets of the triple-effect evaporator and the quadruple-effect evaporator are both connected to the air inlet of the water evaporator.

[0020] Furthermore, the water evaporator includes a water heater and a circulating pump. The shell-side air inlet of the water heater is connected to the secondary steam outlet of the second-effect evaporator, the secondary steam outlet of the third-effect evaporator, and the secondary steam outlet of the fourth-effect evaporator via a pipeline. The tube-side water inlet of the water heater is connected to the condensate outlet of the first-effect evaporator, the condensate outlet of the third-effect evaporator, and the condensate outlet of the fourth-effect evaporator via a pipeline. The tube-side water outlet of the water heater is connected to the water inlet of the circulating pump, the water outlet of the circulating pump is connected to the tube-side water inlet of the water heater, and the tube-side air outlet of the water heater is connected to the air inlet of the steam compressor.

[0021] Furthermore, the outlet of the water heater is connected to the inlet of the water pump via a pipeline, and the outlet of the water pump is connected to the spray inlet of the steam compressor.

[0022] Furthermore, it also includes a water supply pipeline and a water outlet pipeline. The water supply pipeline connects the water supply system to the inlet of the water heater, and the outlet of the circulating pump is connected to the water outlet pipeline. The water supply pipeline is equipped with a water supply valve, and the water outlet pipeline is equipped with a water outlet valve. The water heater is equipped with a water level gauge to detect the water level in the pipe. The water level gauge is electrically connected to the water supply valve and the water outlet valve. The water supply valve and the water outlet valve are adjusted by controlling the water level in the pipe within the water heater.

[0023] Furthermore, the condensate outlet of the steam compressor is connected to the inlet of the condensate tank of the fan, the outlet of the condensate tank is connected to the inlet of the condensate pump of the fan, and the outlet of the condensate pump of the fan is connected to the inlet of the circulating pump. The condensate tank of the fan is equipped with a condensate level gauge, which is electrically connected to the condensate pump of the fan. The condensate pump of the fan is regulated by controlling the water level in the condensate tank.

[0024] Furthermore, it also includes a preheating system, which comprises a condensate preheater and a non-condensable gas preheater. The inlet of the condensate preheater is connected to the outlet of the feed pump, the outlet of the condensate preheater is connected to the inlet of the non-condensable gas preheater, and the outlet of the non-condensable gas preheater is connected to the inlet of the double-effect evaporator.

[0025] The preheating medium inlet of the condensate preheater is connected to the outlet of the condensate pump, and the preheating medium outlet of the condensate preheater is connected to the drainage system. The inlet of the condensate pump is connected to the outlet of a condensate tank for collecting and storing condensate. The inlet of the condensate tank is connected to the condensate outlets of the double-effect evaporator, the water evaporator, the tail gas condenser, and the non-condensable gas preheater.

[0026] The inlet of the non-condensable gas preheater is connected to the non-condensable gas outlet of the water heater of the water evaporator, and the outlet of the non-condensable gas preheater is connected to the inlet of the tail gas condenser.

[0027] Furthermore, the condensate tank is equipped with a condensate level gauge, and a condensate preheating valve is installed on the pipeline connecting the outlet of the condensate pump to the preheating medium inlet of the condensate preheater. The condensate level gauge is electrically connected to the condensate preheating valve, and the condensate preheating valve is adjusted by controlling the water level in the condensate tank.

[0028] Furthermore, it also includes a double-effect preheater, wherein the inlet of the double-effect preheater is connected to the outlet of the feed pump, the outlet of the double-effect preheater is connected to the inlet of the double-effect evaporator, the air inlet of the double-effect preheater is connected to the non-condensable gas outlet of the double-effect evaporator, and the air outlet of the double-effect preheater is connected to the air inlet of the water evaporator.

[0029] Furthermore, it also includes a first-effect preheater, the inlet of which is connected to the outlet of the second-effect evaporator, the outlet of which is connected to the inlet of the first-effect evaporator, the air inlet of which is connected to the non-condensable gas outlet of the first-effect evaporator, the non-condensable gas outlet of the third-effect evaporator and the non-condensable gas outlet of the fourth-effect evaporator, and the air outlet of which is connected to the air inlet of the second-effect evaporator.

[0030] Furthermore, the separator of the four-effect evaporator is equipped with a four-effect level gauge for detecting the material level of the four-effect evaporator, and a three-effect feed valve is provided on the pipeline connecting the outlet of the first-effect evaporator and the inlet of the third-effect evaporator. The four-effect level gauge is electrically connected to the three-effect feed valve, and the three-effect feed valve is adjusted by controlling the material level in the separator of the four-effect evaporator.

[0031] Furthermore, a first-effect feed valve is provided on the pipeline connecting the outlet of the second-effect evaporator and the inlet of the first-effect preheater. A first-effect level gauge is provided on the heater of the first-effect evaporator to detect the material level of the first-effect evaporator. The first-effect level gauge is electrically connected to the first-effect feed valve, and the first-effect feed valve is adjusted by controlling the material level in the heater of the first-effect evaporator.

[0032] Furthermore, the condensate tank has an outlet, which is connected to the inlet of the non-condensable gas preheater via a pipeline.

[0033] The beneficial effects of this utility model are as follows:

[0034] 1. This utility model uses the secondary steam containing methanol gas generated during the evaporation process of methanol-containing materials as a heat source to heat water, producing pure saturated steam. The pure saturated steam enters the steam compressor and is compressed into high-pressure, high-temperature compressed steam. The compressed steam is used to heat the methanol-containing materials, causing them to evaporate and concentrate. After the system stabilizes, the live steam is only used as a supplementary heat source, which can effectively reduce the amount of live steam used, save costs, reduce the risk of methanol explosion, reduce the corrosion of the compressor's mechanical structure by methanol, and ensure the normal and stable operation of the system.

[0035] 2. The double-effect preheater of this invention uses the non-condensable gas generated by the double-effect evaporator to preheat the material, and can recover the waste heat of the non-condensable gas generated by the double-effect evaporator. The single-effect preheater of this invention uses the non-condensable gas generated by the single-effect evaporator to preheat the material, realizing the recovery and reuse of the non-condensable gas generated by the single-effect evaporator. This invention is equipped with a non-condensable gas preheater, which uses the waste heat in the non-condensable gas discharged from the water evaporator to preheat the material. The setting of the double-effect preheater, the single-effect preheater and the non-condensable gas preheater can fully recover the waste heat in the non-condensable gas, improve energy utilization rate and reduce energy consumption.

[0036] 3. The first-effect and second-effect evaporators of this utility model are falling film evaporators, and the third-effect and fourth-effect evaporators of this utility model are forced circulation evaporators. The combination of falling film evaporators and forced circulation evaporators can enable materials to have sufficient effective heat exchange temperature difference and evaporation intensity at different concentrations, which can effectively improve evaporation efficiency.

[0037] 4. The single-effect, triple-effect, and quadruple-effect evaporators of this invention use pure steam as a heat source to evaporate and concentrate materials. The condensate formed after the pure steam heats up is pure condensate, which can be directly used to produce pure steam. Therefore, the condensate discharged from the single-effect, triple-effect, and quadruple-effect evaporators directly enters the water evaporator. The steam entering the steam compressor of this invention is pure steam, and the condensate produced when it is compressed and heated is also pure condensate, which directly enters the water evaporator to produce pure steam. After being pressurized and heated by the compressor, the pure steam re-enters the single-effect, triple-effect, and quadruple-effect evaporators to heat the materials. Therefore, this invention can realize the recycling of condensate, save water resources, and reduce costs.

[0038] 5. The double-effect evaporator of this invention uses the secondary steam separated by the separator of the single-effect evaporator as a heat source to evaporate and concentrate the material. The secondary steam contains methanol gas and other impurities. Therefore, after the secondary steam heats the material in the double-effect evaporator, it condenses, and the resulting condensate contains methanol and other impurities. Therefore, the condensate produced by the double-effect evaporator cannot be transported to the water evaporator. The condensate containing impurities is stored in the condensate tank. The water evaporator of this invention uses the secondary steam separated by the double-effect, triple-effect, and quadruple-effect evaporators as a heat source to heat water. The water is heated and evaporates to produce pure steam. The secondary steam releases heat and cools down to condense. This condensate contains impurities and cannot be used to produce steam. Therefore, the condensate from the double-effect evaporator and the condensate from the water evaporator are collected in the condensate tank and then enter the condensate preheater to preheat the material, realizing the recovery and utilization of the residual heat in the condensate containing impurities.

[0039] 6. The exhaust gas condenser of this utility model is equipped with a pressure sensor. The pressure sensor detects the pressure inside the exhaust gas condenser, i.e., the system vacuum degree. A make-up gas pipeline is provided on the pipeline connecting the exhaust gas condenser outlet and the vacuum pump inlet. A vacuum regulating valve is provided on the make-up gas pipeline. The pressure sensor is electrically connected to the vacuum regulating valve. The vacuum regulating valve is adjusted by controlling the pressure inside the exhaust gas condenser, thereby realizing the adjustment and control of the system vacuum degree. This allows the utility model to operate under suitable vacuum conditions, ensuring the stability of the equipment operation.

[0040] 7. This utility model is equipped with a water supply pipe and a water outlet pipe. When the water level in the tube side of the water evaporator is too low, water can be added to the water evaporator through the water supply pipe to meet the evaporation requirements and ensure the steam requirements of the system. When the water level in the tube side of the water evaporator is too high, excess water in the water evaporator can be discharged through the water outlet pipe. The setting of the water supply pipe and the water outlet pipe can effectively ensure the water balance in the system.

[0041] 8. This utility model has a simple structure, is easy to use, has a novel design, and is low in cost. It can effectively realize the MVR evaporation and concentration of methanol-containing materials, reduce the amount of steam used during material evaporation and concentration, reduce energy consumption, and lower the cost of evaporation and concentration. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to the accompanying drawings.

[0044] like Figure 1 As shown, an MVR evaporation and concentration system for methanol-containing materials includes a material tank 1 for storing methanol-containing materials, a feed pump 2 connected to the material tank 1 at its inlet, a preheating system for preheating materials, the preheating system including a condensate preheater 3 and a non-condensable gas preheater 4, and a material evaporation system for evaporating and concentrating methanol-containing materials, the material evaporation system including a second-effect evaporator 8, a first-effect evaporator 7, a third-effect evaporator 9, and a fourth-effect evaporator 10 connected sequentially along the material flow direction, the first-effect evaporator 7 and the second-effect evaporator 8 being falling film evaporators, and the third-effect evaporator 9 and the fourth-effect evaporator 10 being forced circulation evaporators. The system includes a water evaporator 11 that uses secondary steam to heat water and generate pure steam, a steam compressor 12 that compresses the pure steam to generate high-temperature and high-pressure compressed steam, a condensate tank 28 for recovering condensate, a fan condensate tank 21 for recovering fan condensate from the steam compressor 12, a second-effect preheater 18 that uses non-condensable gas from the second-effect evaporator 8 to preheat materials, and a first-effect preheater 19 that uses non-condensable gas from the first-effect evaporator 7, the third-effect evaporator 9, and the fourth-effect evaporator 10 to preheat materials. The first-effect preheater 19, the second-effect preheater 18, the non-condensable gas preheater 4, and the tail gas condenser 5 are all shell and tube heat exchangers, and the condensate preheater 3 is a plate heat exchanger.

[0045] The single-effect evaporator 7 includes a single-effect heat exchanger 71, a single-effect separator 72, and a single-effect circulating pump 73. The single-effect heat exchanger 71 is a shell-and-tube heat exchanger. The tube-side outlet of the single-effect heat exchanger 71 is connected to the inlet of the single-effect separator 72. The outlet of the single-effect separator 72 and the tube-side outlet located at the lower end of the single-effect heat exchanger 71 are connected to the inlet of the single-effect circulating pump 73. The outlet of the single-effect circulating pump 73 is connected to the tube-side inlet located at the upper end of the single-effect heat exchanger 71. The outlet of the single-effect circulating pump 73 is also connected to the single-effect discharge pipeline 74. The upper end of the single-effect separator 72 has a secondary steam outlet. The single-effect heat exchanger 71 has a shell-side inlet, a non-condensable gas outlet, and a condensate outlet. The shell-side inlet, non-condensable gas outlet, and condensate outlet are all connected to the shell side of the single-effect heat exchanger 71.

[0046] The double-effect evaporator 8 includes a double-effect heat exchanger 81, a double-effect separator 82, and a double-effect circulating pump 83. The double-effect heat exchanger 81 is a shell-and-tube heat exchanger. The tube-side outlet of the double-effect heat exchanger 81 is connected to the inlet of the double-effect separator 82. The outlet of the double-effect separator 82 and the tube-side outlet located at the lower end of the double-effect heat exchanger 81 are connected to the inlet of the double-effect circulating pump 83. The outlet of the double-effect circulating pump 83 is connected to the tube-side inlet located at the upper end of the double-effect heat exchanger 81. The outlet of the double-effect circulating pump 83 is also connected to the double-effect discharge pipeline 84. The upper end of the double-effect separator 82 has a secondary steam outlet. The double-effect heat exchanger 81 has a shell-side inlet, a non-condensable gas outlet, and a condensate outlet. The shell-side inlet, non-condensable gas outlet, and condensate outlet are all connected to the shell side of the double-effect heat exchanger 81.

[0047] The triple-effect evaporator 9 includes a triple-effect heat exchanger 91, a triple-effect separator 92, and a triple-effect forced circulation pump 93. The triple-effect heat exchanger 91 is a shell-and-tube heat exchanger. The tube-side outlet at the upper end of the triple-effect heat exchanger 91 is connected to the inlet of the triple-effect separator 92, and the outlet at the lower end of the triple-effect separator 92 is connected to the inlet of the triple-effect forced circulation pump 93. The outlet of the triple-effect forced circulation pump 93 is connected to the tube-side inlet at the lower end of the triple-effect heat exchanger 91. The triple-effect separator 92 has a secondary steam outlet at its upper end. The triple-effect heat exchanger 91 has a shell-side inlet, a non-condensable gas outlet, and a condensate outlet. The shell-side inlet, non-condensable gas outlet, and condensate outlet are all connected to the shell side of the triple-effect heat exchanger 91.

[0048] The four-effect evaporator 10 includes a four-effect heat exchanger 101, a four-effect separator 102, and a four-effect forced circulation pump 103. The four-effect heat exchanger 101 is a shell-and-tube heat exchanger. The tube-side outlet at the upper end of the four-effect heat exchanger 101 is connected to the inlet of the four-effect separator 102, and the outlet at the lower end of the four-effect separator 102 is connected to the inlet of the four-effect forced circulation pump 103. The outlet of the four-effect forced circulation pump 103 is connected to the tube-side inlet at the lower end of the four-effect heat exchanger 101. The upper end of the four-effect separator 102 is provided with a secondary steam outlet. The four-effect heat exchanger 101 has a shell-side air inlet, a non-condensable gas outlet, and a condensate outlet. The shell-side air inlet, non-condensable gas outlet, and condensate outlet are all connected to the shell side of the four-effect heat exchanger 101. The four-effect separator 102 is equipped with a four-effect level gauge 104 for detecting the material level inside the four-effect separator 102. The discharge port of the first-effect circulating pump 73 is connected to the inlet of the third-effect forced circulating pump 93 through the first-effect discharge pipeline 74. The first-effect discharge pipeline 74 is equipped with a third-effect feed valve 75. The four-effect level gauge 104 is electrically connected to the third-effect feed valve 75. The third-effect feed valve 75 is adjusted by controlling the material level inside the separator of the four-effect evaporator 10.

[0049] The water evaporator 11 includes a water heater 110 and a circulating pump 111. The water heater 110 is a shell-and-tube heat exchanger. The shell-side outlet of the water heater 110 is connected to the inlet of the circulating pump 111, and the outlet of the circulating pump 111 is connected to the shell-side inlet of the water heater 110. The water heater 110 has a shell-side air inlet, a non-condensable gas outlet, a tube-side air outlet, and a condensate outlet. The shell-side air inlet, non-condensable gas outlet, and condensate outlet are all connected to the shell side of the water heater 110, and the tube-side air outlet is connected to the tube side of the water heater 110. The shell-side outlet of the water heater 110 is connected to the inlet of a spray pump 20 via a pipeline, and the outlet of the spray pump 20 is connected to the spray inlet of a steam compressor 12 via a pipeline. A spray flow meter and a spray valve are installed on this pipeline. The spray flow meter and the spray valve are electrically connected, and the spray valve can be adjusted according to the flow rate in the pipeline.

[0050] The outlet of the feed pump 2 is connected to the inlet of the condensate preheater 3. The outlet of the condensate preheater 3 is connected to the inlet of the non-condensable gas preheater 4. The outlet of the non-condensable gas preheater 4 is connected to the inlet of the second-effect preheater 18. The outlet of the second-effect limiting preheater is connected to the tube-side inlet of the second-effect heat exchanger 81 of the second-effect evaporator 8. The outlet of the second-effect circulating pump 83 is connected to the inlet of the first-effect preheater 19 through the second-effect discharge pipeline 84. The outlet of the first-effect preheater 19 is connected to the tube-side inlet of the first-effect heat exchanger 71. The outlet of the first-effect circulating pump 73 is connected to the inlet of the third-effect forced circulation pump 93 via the first-effect discharge pipeline 74. The outlet of the third-effect separator 92 is connected to the inlet of the fourth-effect forced circulation pump 103 via the third-effect discharge pipeline. The outlet of the fourth-effect separator 102 is connected to the inlet of the discharge pump 13. The outlet of the discharge pump 13 is connected to the concentrated slurry discharge pipeline 14. According to the above connection method, the material containing methanol flows in the following direction: material tank 1 → feed pump 2 → condensate preheater 3 → non-condensable gas preheater 4 → second-effect preheater 18 → second-effect evaporator 8 → first-effect preheater 19 → first-effect evaporator 7 → third-effect evaporator 9 → fourth-effect evaporator 10 → concentrated slurry discharge pipeline 14.

[0051] The shell-side inlet of the single-effect heat exchanger 71, the shell-side inlet of the triple-effect heat exchanger 91, and the shell-side inlet of the quadruple-effect heat exchanger 101 are all connected to the compressed steam pipeline 17. The compressed steam pipeline 17 is connected to the outlet of the steam compressor 12. The compressed steam pipeline 17 is also connected to the live steam source 15 through the live steam pipeline 16, which is equipped with a live steam valve. The inlet of the steam compressor 12 is connected to the tube-side outlet of the water heater 110. The non-condensable gas outlets of the first-effect heat exchanger 71, the third-effect heat exchanger 91, and the fourth-effect heat exchanger 101 are all connected to the inlet of the first-effect preheater 19. The outlet of the first-effect preheater 19 is connected to the shell-side inlet of the second-effect heat exchanger 81. The secondary steam outlet of the first-effect separator 72 is connected to the shell-side inlet of the second-effect heat exchanger 81. The non-condensable gas outlet of the second-effect heat exchanger 81 is connected to the inlet of the second-effect preheater 18. The outlet of heater 18, the secondary steam outlet of the second-effect separator 82, the secondary steam outlet of the third-effect separator 92, and the secondary steam outlet of the fourth-effect separator 102 are all connected to the shell-side inlet of water heater 110. The non-condensable gas outlet of water heater 110 is connected to the inlet of non-condensable gas preheater 4. The outlet of non-condensable gas preheater 4 is connected to the inlet of tail gas condenser 5. The outlet of tail gas condenser 5 is connected to the inlet of vacuum pump 6, and the outlet of vacuum pump 6 is used for venting. The inlet of tail gas condenser 5 is connected to the cooling water inlet pipeline, and the outlet of tail gas condenser 5 is connected to the cooling water return pipeline. The condensate tank 28 has an outlet, which is connected to the inlet of non-condensable gas preheater 4 via a pipeline.

[0052] The condensate outlet of the double-effect heat exchanger 81, the condensate outlet of the double-effect preheater 18, the condensate outlet of the water heater 110, the condensate outlet of the non-condensable gas preheater 4, and the condensate outlet of the tail gas condenser 5 are connected to the inlet of the condensate tank 28. The outlet of the condensate tank 28 is connected to the inlet of the condensate pump 29. The outlet of the condensate pump 29 is connected to the preheating medium inlet of the condensate preheater 3. The preheating medium outlet of the condensate preheater 3 is connected to the sewage treatment system or the drainage system. The condensate tank 28 is equipped with a condensate level gauge 30. A condensate preheating valve 31 is provided on the pipeline connecting the outlet of the condensate pump 29 and the preheating medium inlet of the condensate preheater 3. The condensate level gauge 30 is electrically connected to the condensate preheating valve 31. The condensate preheating valve 31 is adjusted by controlling the water level in the condensate tank 28. The shell side of the second-effect heat exchanger 81 carries the secondary steam separated by the first-effect separator 72. This secondary steam contains impurities such as materials and methanol gas. Therefore, the condensate flowing out of the second-effect heat exchanger 81 contains impurities and is not pure condensate. Similarly, the non-condensable gas flowing out of the second-effect preheater 18 is used as the preheating medium to preheat materials. The condensate from this non-condensable gas contains impurities. The shell side of the water heater 110 carries the separations from the second-effect separator 82, the third-effect separator 92, and the fourth-effect separator 102. The secondary steam produced contains impurities, and the condensate formed from the secondary steam contains impurities. The non-condensable gas preheater 4 uses the non-condensable gas flowing out of the water heater 110 as the preheating medium. The condensate after the non-condensable gas is condensed contains impurities. The tail gas condenser 5 condenses the non-condensable gas flowing out of the non-condensable gas preheater 4, and the condensate flowing out contains impurities. In other words, the condensate tank 28 recovers condensate containing impurities. After the condensate preheater 3 preheats the materials, it is sent to the drainage system for direct discharge or sent to the sewage system for purification before discharge.

[0053] The condensate outlets of the first-effect heat exchanger 71, the first-effect preheater 19, the third-effect heat exchanger 91, and the fourth-effect heat exchanger 101 are connected to the tube-side inlet of the water heater 110. The fan condensate outlet of the steam compressor 12 is connected to the inlet of the fan condensate tank 21, the outlet of the fan condensate tank 21 is connected to the inlet of the fan condensate pump 22, and the outlet of the fan condensate pump 22 is connected to the inlet of the circulating pump 111 of the water evaporator 11. The first-effect heat exchanger 71, the third-effect heat exchanger 91, and the fourth-effect heat exchanger 101 use live steam or pure compressed steam as a heat source to heat the materials. The condensate produced is pure condensate without impurities. Therefore, the condensate produced by the first-effect heat exchanger 71, the third-effect heat exchanger 91, and the fourth-effect heat exchanger 101 is all sent to the water evaporator 11 for reheating and evaporation. The first-effect preheater 19 uses the non-condensable gas flowing out of the first-effect heat exchanger 71 as a heat source to preheat the materials. The condensate produced is also free of impurities. Therefore, this condensate can also be directly sent to the water evaporator 11. The steam entering the steam compressor 12 is pure steam. Therefore, the condensate produced after compression is also pure condensate. Thus, the fan condensate stored in the fan condensate tank 21 is pure condensate, which is directly sent to the water evaporator 11 by the fan condensate pump 22 for reheating and evaporation to produce pure steam. The fan condensate tank 21 is equipped with a fan condensate level gauge 23, which is electrically connected to the fan condensate pump 22. The fan condensate pump 22 is regulated by controlling the water level in the fan condensate tank 21.

[0054] The inlet of the water heater 110 is connected to the water supply system via the water supply pipe 24, and the outlet of the circulating pump 111 is connected to the outlet pipe 26. The water supply pipe 24 is equipped with a water supply valve 25, and the outlet pipe 26 is equipped with an outlet valve 27. The water heater 110 is equipped with a water level gauge 112 for detecting the water level in the pipe. The water level gauge 112 is electrically connected to the water supply valve 25 and the outlet valve 27. The water supply valve 25 and the outlet valve 27 are adjusted by controlling the water level in the pipe within the water heater 110.

[0055] The first-effect evaporator 7 is equipped with a first-effect level gauge 76 for detecting the liquid level in the tube side of the first-effect heat exchanger 71. The second-effect discharge pipeline 84 is equipped with a first-effect feed valve 75. The first-effect level gauge 76 is electrically connected to the first-effect feed valve 75. The first-effect feed valve 75 is adjusted by controlling the material level in the heater of the first-effect evaporator 7.

[0056] During initial operation, the raw steam provided by the raw steam source 15 is used as a heat source to evaporate and concentrate the methanol-containing material. The raw steam valve is opened and the vacuum pump 6 is started. The raw steam enters the compressed steam pipeline 17 through the raw steam pipeline 16, and then enters the shell side of the first-effect heat exchanger 71, the shell side of the third-effect heat exchanger 91 and the shell side of the fourth-effect heat exchanger 101 through the compressed steam pipeline 17.

[0057] Start the feed pump 2, which transports the methanol-containing material in the material tank 1 to the condensate preheater 3, then through the non-condensable gas preheater 4, then through the preheater of the second effect, and finally into the tube side of the second effect heat exchanger 81. Since there is insufficient condensate in the condensate tank 28 and insufficient non-condensable gas in the system at the initial start-up, the non-condensable gas discharged from the second effect heat exchanger 81 is small. Therefore, at this time, the condensate preheater 3, the non-condensable gas preheater 4 and the preheater of the second effect basically achieve the purpose of not preheating the material. The second-effect heat exchanger 81 uses the secondary steam separated from the first-effect separator 72 as a heat source to heat the material. At this time, there is no material in the first-effect evaporator 7, so no secondary steam is generated, and no heat source gas flows into the second-effect heat exchanger 81. Therefore, the second-effect evaporator 81 does not work at this time. The material entering the second-effect heat exchanger 81 directly enters the first-effect preheater 19 through the second-effect discharge pipe 84. Since there is no material in the first-effect evaporator 7, the live steam in the shell side of the first-effect heat exchanger 71 flows directly out from the non-condensable gas outlet into the first-effect preheater 19. In the first-effect preheater 19, the material is preheated by the live steam, and the material temperature rises. Since the material is preheated directly by the live steam, the high temperature of the live steam can make the material rise rapidly.

[0058] The material flowing out of the first-effect preheater 19 directly enters the tube side of the first-effect heat exchanger 71, where it exchanges heat with the live steam in the shell side. The live steam heats the material, raising its temperature and causing the moisture in the material to evaporate. The evaporated secondary steam and some material enter the first-effect separator 72 from the tube side outlet of the first-effect heat exchanger 71, where gas-liquid separation occurs. The separated secondary steam enters the shell side of the second-effect heat exchanger 81. The separated material, under the action of the first-effect circulating pump 73, re-enters the tube side of the first-effect heat exchanger 71 through the tube side inlet at the top for heating. The material flowing out of the tube side outlet of the first-effect heat exchanger 71 is then re-entered through the tube side inlet at the top for heating again under the action of the first-effect circulating pump 73. This cycle repeats continuously, causing the material to evaporate and concentrate in the first-effect evaporator 7.

[0059] Open the triple-effect feed valve 75. The material, after being evaporated and concentrated by the first-effect evaporator 7, enters the tube side of the triple-effect heat exchanger 91 under the action of the triple-effect forced circulation pump 93 along the first-effect discharge pipe 74. The live steam in the compressed steam pipe 17 enters the shell side of the triple-effect heat exchanger 91. Inside the triple-effect heat exchanger 91, the shell-side live steam and the tube-side material are heated, the material temperature rises, and the moisture evaporates. Then, the heated material and the evaporated secondary steam enter the triple-effect separator 92 together. Gas-liquid separation occurs in the triple-effect separator 92. The separated secondary steam flows out from the secondary steam outlet of the triple-effect separator 92, and the separated material enters the feed inlet of the triple-effect forced circulation pump 93 from the outlet of the triple-effect separator 92. Under the action of the triple-effect forced circulation pump 93, it re-enters the tube side of the triple-effect heat exchanger 91. This cycle repeats, causing the material to evaporate and concentrate in the triple-effect evaporator 91.

[0060] The material concentrated by evaporation in the triple-effect evaporator 9 enters the tube side of the quadruple-effect heat exchanger 101 under the action of the quadruple-effect forced circulation pump 103. The live steam in the compressed steam pipeline 17 enters the shell side of the quadruple-effect heat exchanger 101. Inside the quadruple-effect heat exchanger 101, the shell-side live steam and the tube-side material are heated, the material temperature rises, and the moisture evaporates. Then, the heated material and the evaporated secondary steam enter the quadruple-effect separator 102 together. Gas-liquid separation occurs in the quadruple-effect separator 102. The separated secondary steam flows out from the secondary steam outlet of the quadruple-effect separator 102, and the separated material enters the inlet of the quadruple-effect forced circulation pump 103 from the outlet of the quadruple-effect separator 102. Under the action of the quadruple-effect forced circulation pump 103, the material re-enters the tube side of the quadruple-effect heat exchanger 101. This cycle repeats, causing the material to evaporate and concentrate in the quadruple-effect evaporator 10. The discharge pump 13 is started, and the material concentrated by evaporation in the four-effect evaporator 10 is discharged from the concentrated slurry discharge pipeline 14 under the action of the discharge pump 13. The concentrated slurry discharge pipeline 14 is equipped with a concentrated slurry discharge valve and a concentrated slurry flow meter. The concentrated slurry flow meter is electrically connected to the concentrated slurry discharge valve, and the concentrated slurry discharge valve is adjusted by controlling the concentrated slurry flow rate in the concentrated slurry discharge pipeline 14. The concentrated slurry discharge pipeline 14 is connected to the inlet of the four-effect forced circulation pump 103 through a return pipeline. The return pipeline is equipped with a return valve. When the concentration of the material discharged from the concentrated slurry discharge pipeline 14 does not meet the discharge requirements, the return valve is activated, and the material is re-entered into the four-effect evaporator 10 for evaporation and concentration through the return pipeline.

[0061] The secondary steam separated by the first-effect separator 72 enters the shell side of the second-effect heat exchanger 81, where it heats the material in the tube side. The material heats up, evaporates, and concentrates. The evaporated secondary steam enters the second-effect separator 82 for gas-liquid separation. The separated secondary steam flows out from the secondary steam outlet of the second-effect separator 82. The separated material and the material flowing out from the tube side outlet of the second-effect heat exchanger 81 are re-entered into the tube side of the second-effect heat exchanger 81 by the circulation pump 111. This cycle continues, causing the material to evaporate and concentrate in the second-effect evaporator 8. The material concentrated by the second-effect evaporator 8 enters the tube side of the first-effect preheater 19. The non-condensable gas discharged from the non-condensable gas outlet of the first-effect heat exchanger 71 enters the shell side of the first-effect preheater 19. In the first-effect preheater 19, the non-condensable gas in the shell side heats the material in the tube side, thus preheating the material before it enters the first-effect evaporator 7.

[0062] The secondary steam separated from the two-effect separator 82, the three-effect separator 92, and the four-effect separator 102 enters the shell side of the water heater 110 through a management system. The condensate outlets of the first-effect heat exchanger 71, the first-effect preheater 19, the three-effect heat exchanger 91, and the four-effect heat exchanger 101 enter the tube side of the water heater 110. Inside the water heater 110, the secondary steam in the shell side heats the condensate in the tube side, causing the condensate to evaporate and produce pure steam. The pure steam enters the steam compressor 12 from the outlet of the tube side of the water heater 110. The steam compressor 12 compresses the pure steam, increasing its pressure and temperature to produce high-grade pure steam. The high-grade pure steam enters the compressed steam pipeline 17 from the outlet of the steam compressor 12, and then re-enters the first-effect heat exchanger 71, the second-effect heat exchanger 81, and the third-effect heat exchanger 91 along the compressed steam pipeline 17 to participate in the heating of the materials.

[0063] The non-condensable gas flowing out of the non-condensable gas outlet of the water heater 110 enters the shell side of the non-condensable gas preheater 4, heating the material in the tube side of the non-condensable gas preheater 4 to achieve material preheating. As the material heats up, the non-condensable gas cools down. The cooled non-condensable gas flows out from the outlet of the non-condensable gas preheater 4 and enters the shell side of the tail gas condenser 5. Cooling water enters the tube side of the tail gas condenser 5, where the non-condensable gas is condensed using the cooling water. After cooling down, the non-condensable gas is discharged from the outlet of the tail gas condenser 5 and then vented from the outlet of the vacuum pump 6.

[0064] The condensate flowing from the condensate outlet of the double-effect heat exchanger 81, the condensate flowing from the condensate outlet of the double-effect preheater 18, and the condensate flowing from the condensate outlet of the non-condensable gas preheater 4 enter the condensate tank 28. The condensate pump 29 is started, and under the action of the condensate pump 29, the condensate in the condensate tank 28 enters the condensate preheater 3, and the condensate is used to heat the material to achieve the preheating of the material.

[0065] Once the system is running stably, and the high-grade compressed steam flowing out of the outlet of the steam compressor 12 is sufficient to meet the evaporation requirements, the steam valve is closed. The live steam provided by the live steam source 15 enters the system only through the air supply port of the steam compressor 12 as supplementary steam.

[0066] The material flows in the following direction: material tank 1 → feed pump 2 → condensate preheater 3 → non-condensable gas preheater 4 → double-effect preheater 18 → double-effect evaporator 8 → first-effect preheater 19 → first-effect evaporator 7 → triple-effect evaporator 9 → quadruple-effect evaporator 10 → concentrated slurry discharge pipeline 14. The material entering the condensate preheater 3 is preheated for the first time by the condensate in the condensate tank 28. After the first preheating, the material is preheated for the second time by the non-condensable gas in the non-condensable gas preheater 4. Then it enters the second-effect preheater 18, where the material is preheated for the third time by the non-condensable gas flowing out of the second-effect heat exchanger 81. After the three preheatings, the material enters the second-effect heat exchanger 81, where it is first evaporated and concentrated by the secondary steam separated by the first-effect separator 72. After the first evaporation and concentration, the material enters the first-effect preheater 19, where it is preheated for the first-effect evaporation by the non-condensable gas flowing out of the first-effect heat exchanger 71. Then the material enters the first-effect evaporator 7, where it is second evaporated and concentrated by the pure compressed steam. After the first-effect evaporator 7, the material enters the third-effect evaporator 9, where it is third evaporated and concentrated by the pure compressed steam. Finally, the material enters the fourth-effect evaporator 10, where it is fourth evaporated and concentrated by the pure compressed steam. The secondary steam separated by the two-effect separator 82, the three-effect separator 92, and the four-effect separator 102 enters the shell side of the water heater 110. The condensate flowing out of the first-effect heat exchanger 71, the first-effect preheater 19, the third-effect heat exchanger 91, and the fourth-effect heat exchanger 101 enters the tube side of the water heater 110. Inside the water heater 110, the secondary steam heats the condensate, causing it to evaporate back into pure steam. The pure steam is then compressed by the steam compressor 12 and re-enters the first-effect evaporator 7, the third-effect evaporator 9, and the fourth-effect evaporator 10 as a heat source. This achieves the recovery and recycling of steam and condensate, reduces water consumption, and uses live steam only as supplementary steam, saving energy and reducing costs.

[0067] When the steam compressor 12 requires spray cleaning, the spray pump 20 is started. Condensate in the tubes of the water heater 110 enters through the spray nozzle of the steam compressor 12 under the action of the spray pump 20, spraying the steam compressor 12. The spray water is then stored in the blower condensate tank 21. When the condensate level in the blower condensate tank 21 rises to the set level, the blower condensate pump 22 is started, which pumps the condensate stored in the blower condensate tank 21 into the tubes of the water heater 110 to participate in the production of pure steam. When the water level in the tubes of the water heater 110 is lower than the set lower limit, the water supply valve 25 is started, replenishing water from the water supply system through the water supply pipe 24 to the tubes of the water heater 110. When the water level in the tubes of the water heater 110 is higher than the set upper limit, the water outlet valve 27 is started, discharging excess condensate through the water outlet pipe 26.

[0068] It should be noted that the above-described embodiments are illustrative of the technical solution of this utility model and not limiting. Equivalent substitutions or other modifications made by those skilled in the art based on the prior art, as long as they do not exceed the concept and scope of the technical solution of this utility model, should be included within the scope of the claims of this utility model.

Claims

1. An MVR evaporation and concentration system for methanol-containing materials, characterized in that: include: The feeding device includes a material tank (1) for storing methanol-containing materials and a feed pump (2) whose inlet end is connected to the material tank (1). The material evaporation system is used to evaporate and concentrate methanol-containing materials. The material evaporation system includes a second-effect evaporator (8), a first-effect evaporator (7), a third-effect evaporator (9), and a fourth-effect evaporator (10) connected sequentially along the material flow direction. The first-effect evaporator (7) and the second-effect evaporator (8) are both falling film evaporators, and the third-effect evaporator (9) and the fourth-effect evaporator (10) are both forced circulation evaporators. The inlet of the double-effect evaporator (8) is connected to the outlet of the feed pump (2), the outlet of the quadruple-effect evaporator (10) is connected to the inlet of the discharge pump (13), and the outlet of the discharge pump (13) is connected to the slurry discharge pipeline (14). The water evaporator (11) uses the secondary steam generated by the material evaporation system as a heat source to heat water and generate steam. The air inlet of the water evaporator (11) is connected to the secondary steam outlet of the material evaporation system. The steam compressor (12) compresses the steam generated by the water evaporator (11). The inlet of the steam compressor (12) is connected to the steam outlet of the water evaporator (11), and the outlet of the steam compressor (12) is connected to the inlet of the material evaporation system through the compressed steam pipeline (17). A live steam source (15) is connected to a compressed steam pipeline (17) and the air supply port of a steam compressor (12) via a live steam pipeline (16). The exhaust gas condenser (5) has its air inlet connected to the non-condensable gas outlet of the water evaporator (11), its water inlet connected to the cooling water inlet pipe, and its water outlet connected to the cooling water return pipe. Vacuum pump (6), the inlet of vacuum pump (6) is connected to the outlet of exhaust gas condenser (5), and the outlet of vacuum pump (6) is vented.

2. The MVR evaporation and concentration system for methanol-containing materials according to claim 1, characterized in that: The double-effect evaporator (8) uses the secondary steam separated from the first-effect evaporator (7) as a heat source to evaporate and concentrate the material. The air inlet of the double-effect evaporator (8) is connected to the secondary steam outlet of the first-effect evaporator (7), and the secondary steam outlet of the double-effect evaporator (8) is connected to the air inlet of the water evaporator (11). The single-effect evaporator (7), the triple-effect evaporator (9), and the quadruple-effect evaporator (10) use compressed steam and / or live steam as heat sources to evaporate and concentrate materials. The air inlets of the single-effect evaporator (7), the triple-effect evaporator (9), and the quadruple-effect evaporator (10) are all connected to the compressed steam pipeline (17). The compressed steam pipeline (17) is connected to the outlet of the steam compressor (12). The live steam source (15) is connected to the compressed steam pipeline (17) through the live steam pipeline (16). The secondary steam outlet of the triple-effect evaporator (9) and the secondary steam outlet of the quadruple-effect evaporator (10) are both connected to the air inlet of the water evaporator (11).

3. The MVR evaporation and concentration system for methanol-containing materials according to claim 1, characterized in that: It also includes a double-effect preheater (18), the inlet of which is connected to the outlet of the feed pump (2), the outlet of which is connected to the inlet of the double-effect evaporator (8), the inlet of which is connected to the non-condensable gas outlet of the double-effect evaporator (8), and the outlet of which is connected to the inlet of the water evaporator (11).

4. The MVR evaporation and concentration system for methanol-containing materials according to any one of claims 1 to 3, characterized in that: It also includes a first-effect preheater (19), the inlet of which is connected to the outlet of the second-effect evaporator (8), the outlet of which is connected to the inlet of the first-effect evaporator (7), the inlet of which is connected to the non-condensable gas outlet of the first-effect evaporator (7), the non-condensable gas outlet of the third-effect evaporator (9) and the non-condensable gas outlet of the fourth-effect evaporator (10), and the outlet of which is connected to the inlet of the second-effect evaporator (8).

5. The MVR evaporation and concentration system for methanol-containing materials according to claim 4, characterized in that: A first-effect feed valve (75) is provided on the pipeline connecting the outlet of the second-effect evaporator (8) and the inlet of the first-effect preheater (19). A first-effect level gauge (76) for detecting the material level of the first-effect evaporator (7) is provided on the heater of the first-effect evaporator (7). The first-effect level gauge (76) is electrically connected to the first-effect feed valve (75). The first-effect feed valve (75) is adjusted by controlling the material level in the heater of the first-effect evaporator (7).

6. The MVR evaporation and concentration system for methanol-containing materials according to claim 1, characterized in that: The water evaporator (11) includes a water heater (110) and a circulating pump (111). The shell-side air inlet of the water heater (110) is connected to the secondary steam outlet of the second-effect evaporator (8), the secondary steam outlet of the third-effect evaporator (9), and the secondary steam outlet of the fourth-effect evaporator (10) through a pipeline. The tube-side water inlet of the water heater (110) is connected to the condensate outlet of the first-effect evaporator (7), the condensate outlet of the third-effect evaporator (9), and the condensate outlet of the fourth-effect evaporator (10) through a pipeline. The tube-side water outlet of the water heater (110) is connected to the water inlet of the circulating pump (111). The water outlet of the circulating pump (111) is connected to the tube-side water inlet of the water heater (110). The tube-side air outlet of the water heater (110) is connected to the air inlet of the steam compressor (12).

7. The MVR evaporation and concentration system for methanol-containing materials according to claim 6, characterized in that: It also includes a water supply pipeline (24) and a water outlet pipeline (26). The water supply pipeline (24) is connected to the water supply system and the inlet of the water heater (110). The outlet of the circulating pump (111) is connected to the water outlet pipeline (26). The water supply pipeline (24) is equipped with a water supply valve (25). The water outlet pipeline (26) is equipped with a water outlet valve (27). The water heater (110) is equipped with a water level gauge for detecting the water level in the pipe. The water level gauge is electrically connected to the water supply valve (25) and the water outlet valve (27). The water supply valve (25) and the water outlet valve (27) are adjusted by controlling the water level in the pipe within the water heater (110).

8. The MVR evaporation and concentration system for methanol-containing materials according to claim 6, characterized in that: The steam compressor (12) has its fan condensate outlet connected to the inlet of the fan condensate tank (21), the outlet of the fan condensate tank (21) connected to the inlet of the fan condensate pump (22), and the outlet of the fan condensate pump (22) connected to the inlet of the circulating pump (111). The fan condensate tank (21) is equipped with a fan condensate level gauge (23), which is electrically connected to the fan condensate pump (22). The fan condensate pump (22) is regulated by controlling the water level in the fan condensate tank (21).

9. The MVR evaporation and concentration system for methanol-containing materials according to claim 1, characterized in that: It also includes a preheating system, which includes a condensate preheater (3) and a non-condensable gas preheater (4). The inlet of the condensate preheater (3) is connected to the outlet of the feed pump (2), the outlet of the condensate preheater (3) is connected to the inlet of the non-condensable gas preheater (4), and the outlet of the non-condensable gas preheater (4) is connected to the inlet of the double-effect evaporator (8). The preheating medium inlet of the condensate preheater (3) is connected to the outlet of the condensate pump (29), and the preheating medium outlet of the condensate preheater (3) is connected to the drainage system. The inlet of the condensate pump (29) is connected to the outlet of the condensate tank (28) for collecting and storing condensate. The inlet of the condensate tank (28) is connected to the condensate outlet of the double-effect evaporator (8), the condensate outlet of the water evaporator (11), the condensate outlet of the tail gas condenser (5), and the condensate outlet of the non-condensable gas preheater (4). The inlet of the non-condensable gas preheater (4) is connected to the non-condensable gas outlet of the water heater (110) of the water evaporator (11), and the outlet of the non-condensable gas preheater (4) is connected to the inlet of the tail gas condenser (5).

10. The MVR evaporation and concentration system for methanol-containing materials according to claim 9, characterized in that: The condensate tank (28) is equipped with a condensate level gauge (30). A condensate preheating valve (31) is provided on the pipeline connecting the outlet of the condensate pump (29) and the preheating medium inlet of the condensate preheater (3). The condensate level gauge (30) is electrically connected to the condensate preheating valve (31). The condensate preheating valve (31) is adjusted by controlling the water level in the condensate tank (28).

Images