Novel high-concentration alkali liquor evaporation and concentration system

Abstract

The utility model relates to the technical field of chemical engineering, in particular to a novel high-concentration alkali liquor evaporation and concentration system. According to the technical scheme, the device comprises a feeding tank for storing to-be-treated high-concentration alkali liquor; the plurality of preheaters are used for preheating the high-concentration alkali liquor and are connected with the feeding tank through pipelines; the evaporators are used for carrying out step-by-step evaporation and concentration on the high-concentration alkali liquor and are connected with the preheater through pipelines; the plurality of gas-liquid separators are used for separating steam and concentrated alkali liquor in the evaporators; and the gas-liquid separators are positioned in the corresponding evaporators. The device has the beneficial effects that multiple evaporators are arranged, so that high-concentration alkali liquor can be subjected to multi-stage evaporation, and meanwhile, the alkali liquor with different concentrations can be treated by controlling parameters such as pressure and temperature in the evaporators. And by arranging the gas-liquid separator, secondary steam generated by the evaporator can be recycled, so that the use efficiency of energy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, in particular to a novel high-concentration alkali solution evaporation and concentration system. Background Art

[0002] In the chemical, metallurgical and papermaking industries, the treatment and recovery of high-concentration alkali liquor is an important task. Traditional evaporation and concentration systems often have problems such as high energy consumption, low efficiency and complex operation. Therefore, the development of a new type of high-concentration alkali liquor evaporation and concentration system with high efficiency, energy saving and safety has important practical significance and application value. Utility Model Content

[0003] The utility model aims to overcome the defects of the prior art, provide a novel high-concentration alkali solution evaporation concentration system, and solve the problems of high energy consumption, low efficiency, complex operation, etc. of the existing evaporation concentration system.

[0004] The utility model provides a novel high-concentration alkali liquid evaporation and concentration system, and the technical scheme thereof is as follows: comprising: a feed tank for storing the high-concentration alkali liquid to be treated; a plurality of preheaters for preheating the high-concentration alkali liquid, the preheaters being connected to the feed tank through a pipeline; a plurality of evaporators for stepwise evaporation and concentration of the high-concentration alkali liquid, the evaporators being connected to the preheaters through a pipeline; a plurality of gas-liquid separators for separating the steam in the evaporators from the concentrated alkali liquid, the gas-liquid separators being located in the corresponding evaporators.

[0005] Furthermore, the multiple preheaters include a primary preheater and a secondary preheater, the primary preheater and the secondary preheater are connected via a pipeline, and the primary preheater is connected to the feed tank via a pipeline.

[0006] Furthermore, the multiple evaporators include a first-effect evaporator, a second-effect evaporator and a third-effect evaporator connected end to end through a pipeline, and the first-effect evaporator is connected to the secondary preheater through a pipeline.

[0007] Furthermore, the first-effect evaporator is connected to water vapor through a pipeline.

[0008] Furthermore, the multiple gas-liquid separators include a first gas-liquid separator, a second gas-liquid separator and a third gas-liquid separator, and the first gas-liquid separator, the second gas-liquid separator and the third gas-liquid separator are respectively located inside the corresponding first-effect evaporator, second-effect evaporator and third-effect evaporator.

[0009] Furthermore, it also includes a condenser for recovering energy from the generated low-temperature steam, the condenser is connected to the first gas-liquid separator, the second gas-liquid separator and the third gas-liquid separator through a pipeline, and the condenser is connected to the secondary preheater through a pipeline.

[0010] Furthermore, it also includes a dirty condensed water tank, which is connected to the condenser, the primary preheater and multiple evaporators through a pipeline.

[0011] Furthermore, it also includes a compressor, which is connected to the third gas-liquid separator and the first-effect evaporator through a pipeline.

[0012] Furthermore, a liquid level meter and a temperature sensor are provided in the feed tank.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] By setting up multiple evaporators, high-concentration alkali solution can be evaporated in multiple stages, and alkali solution of different concentrations can be processed by controlling parameters such as pressure and temperature inside the evaporator. By setting up a gas-liquid separator, the secondary steam generated by the evaporator can be reused, thereby improving the efficiency of energy use.

[0015] High efficiency and energy saving, using advanced falling film evaporation technology and energy-saving equipment to reduce energy consumption and operating costs.

[0016] It is easy to operate and adopts automatic control technology to realize one-key opening or closing of the entire evaporation and concentration process. It can monitor and control it accurately in real time, reducing the difficulty of operation and labor intensity.

[0017] Safe and reliable, with a complete safety protection system to ensure the safe operation of the system.

[0018] Environmentally friendly and energy-saving, the recovered heat can be recycled, reducing energy waste and environmental pollution.

[0019] Closed structure: The entire system adopts a closed structure, which effectively prevents the leakage of waste gas and waste water and reduces pollution to the environment. At the same time, the closed structure also helps to maintain the temperature and pressure inside the system stable and improve evaporation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a system schematic diagram of the high-concentration alkali solution evaporation and concentration system of the utility model.

[0021] Legend: 1. Liquid inlet tank; 21. Primary preheater; 22. Secondary preheater; 31. First-effect evaporator; 32. Second-effect evaporator; 33. Third-effect evaporator; 41. First gas-liquid separator; 42. Second gas-liquid separator; 43. Third gas-liquid separator; 5. Condenser; 6. Dirty condensed water tank; 7. Compressor. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0023] See also Figure 1 The utility model provides a new type of high-concentration alkali liquid evaporation and concentration system, which solves the problems of high energy consumption, low efficiency, and complex operation of the existing evaporation and concentration system. By setting up multiple evaporators, the high-concentration alkali liquid can be evaporated in multiple stages, and the alkali liquid of different concentrations can be treated by controlling the parameters such as the pressure and temperature inside the evaporator. By setting up a gas-liquid separator, the secondary steam generated by the evaporator can be reused, thereby improving the efficiency of energy use. High efficiency and energy saving, using advanced falling film evaporation technology and energy-saving equipment to reduce energy consumption and operating costs. Easy to operate, using automatic control technology to achieve one-button opening or closing of the entire evaporation and concentration process, real-time monitoring and precise control, reducing the difficulty of operation and labor intensity. Safe and reliable, with a complete safety protection system to ensure the safe operation of the system. Environmentally friendly and energy-saving, the recovered heat can be recycled, reducing energy waste and environmental pollution. Closed structure, the entire system adopts a closed structure, which effectively prevents the leakage of waste gas and wastewater and reduces pollution to the environment; at the same time, the closed structure also helps to maintain the temperature and pressure inside the system stable and improve evaporation efficiency.

[0024] See also Figure 1 , showing a diagram of a novel high-concentration alkali solution evaporation and concentration system of the utility model. Figure 1 , a novel high-concentration alkali solution evaporation and concentration system of the utility model is described.

[0025] like Figure 1 As shown, a novel high-concentration alkali solution evaporation and concentration system of the utility model comprises:

[0026] A feed tank 1 for storing the high-concentration alkali solution to be treated;

[0027] A plurality of preheaters for preheating the highly concentrated alkali solution, wherein the preheaters are connected to the feed tank 1 through pipelines; a low-grade heat source is used to preheat the highly concentrated alkali solution to reduce energy consumption in subsequent heating processes;

[0028] Multiple evaporators are used to evaporate and concentrate the highly concentrated alkali solution step by step, and the evaporators are connected to the preheater through pipelines; the highly concentrated alkali solution is evaporated and concentrated step by step by controlling the pressure and temperature inside the multiple evaporators;

[0029] Multiple gas-liquid separators are used to separate the steam and concentrated alkali liquid in the evaporator, and the gas-liquid separators are located in the corresponding evaporators; the gas-liquid separators are used to separate the steam generated by the evaporator and the concentrated alkali liquid, and the gas-liquid separators use high-efficiency separation technology to ensure the complete separation of steam and alkali liquid. The gas-liquid separator transmits the separated secondary steam to the next evaporator through a pipeline, thereby improving the energy utilization efficiency.

[0030] In a specific embodiment, the plurality of preheaters include a primary preheater 21 and a secondary preheater 22, the primary preheater 21 and the secondary preheater 22 are connected via a pipeline, and the primary preheater 21 is connected to the feed tank 1 via a pipeline.

[0031] In a specific embodiment, the plurality of evaporators include a first-effect evaporator 31, a second-effect evaporator 32 and a third-effect evaporator 33 connected end to end through a pipeline, and the first-effect evaporator 31 is connected to the secondary preheater 22 through a pipeline.

[0032] In a specific embodiment, the first-effect evaporator 31 is connected to water vapor through a pipeline.

[0033] In a specific embodiment, the multiple gas-liquid separators include a first gas-liquid separator 41, a second gas-liquid separator 42 and a third gas-liquid separator 43, and the first gas-liquid separator 41, the second gas-liquid separator 42 and the third gas-liquid separator 43 are respectively located inside the corresponding first-effect evaporator 31, the second-effect evaporator 32 and the third-effect evaporator 33.

[0034] In a specific embodiment, a condenser 5 for recovering energy from low-temperature steam is also included. The condenser 5 is connected to the first gas-liquid separator 41, the second gas-liquid separator 42 and the third gas-liquid separator 43 through a pipeline, and the condenser 5 is connected to the secondary preheater 22 through a pipeline. The condenser 5 can condense the low-temperature steam separated by the gas-liquid separator 4 into water; the condenser 5 adopts efficient condensation technology to ensure rapid condensation of steam and efficient recovery of heat. The gas-liquid separator 4 adopts efficient separation technology to ensure the thorough separation of steam and alkali solution, and avoids corrosion of the condenser 5 by the alkali solution remaining in the steam.

[0035] In a specific embodiment, a dirty condensed water tank 6 is further included, and the dirty condensed water tank 6 is connected to the condenser 5 and the primary preheater 21 through a pipeline. The dirty condensed water tank 6 is used to store the secondary condensed water generated by the condenser 5, and transmit the secondary condensed water to the primary preheater 21 through a pipeline for recycling.

[0036] In a specific embodiment, a vacuum system is further included, and the vacuum system is arranged on the secondary preheater 22. The vacuum system generates negative pressure in the condenser 5 through a pipeline, so that the low-temperature steam in the evaporator can be sucked out; for the non-condensable gas that cannot be condensed by the condenser 5, the vacuum system sucks out the non-condensable gas in the condenser 5 through a pipeline, so as to prevent the non-condensable gas from affecting the evaporation efficiency.

[0037] In a specific embodiment, a compressor 7 is further included, and the compressor 7 is connected to the third gas-liquid separator 43 and the first-effect evaporator 31 through a pipeline.

[0038] In a preferred embodiment, the compressor 7 is an MVR compressor. The secondary steam separated in the third gas-liquid separator 43 enters the MVR compressor through a pipeline, and after the pressure and temperature are increased, enters the first-effect evaporator 31 through a pipeline for circulation as a heat source, thereby improving the energy utilization efficiency.

[0039] In a specific embodiment, a liquid level meter and a temperature sensor are provided in the feed tank 1. By providing a liquid level meter, the remaining amount of the feed liquid in the feed tank 1 can be monitored in real time, so that the feed liquid in the feed tank 1 can be replenished in time; by providing a temperature sensor, the storage state of the alkali solution in the feed tank 1 can be monitored.

[0040] In a specific embodiment, a discharge pipe is provided on the triple-effect evaporator 33. After being concentrated by three evaporators, the evaporated and concentrated alkali solution is discharged from the discharge pipe.

[0041] In a specific embodiment, the first-effect evaporator 31 is a forced falling film evaporator, the second-effect evaporator 32 is a falling film evaporator, and the third-effect evaporator 33 is a falling film evaporator. The first-effect evaporator 31 is provided with a circulation pump, a heat exchange chamber and an evaporation chamber. The circulation pump transfers the feed liquid into the heat exchange chamber and heats the feed liquid by injecting water vapor into the heat exchange chamber. Due to the high pressure in the heat exchange chamber, the boiling point of the feed liquid in the heat exchanger will increase, which will cause the temperature of the feed liquid to overheat. After the overheated feed liquid enters the evaporation chamber, the pressure of the feed liquid drops rapidly, causing part of the feed liquid to flash or boil rapidly.

[0042] In a specific embodiment, the evaporator is provided with a high-efficiency heat exchange tube bundle, which can ensure that the feed liquid is heated evenly during the evaporation process and prevent scaling and clogging.

[0043] In a preferred embodiment, a control system is also included, and the control system adopts advanced automatic control technology to achieve real-time monitoring and precise control of the entire evaporation and concentration process.

[0044] In a preferred embodiment, it also includes a safety protection system, which includes safety monitoring devices such as temperature, pressure, liquid level, and an emergency stop device to ensure the safe operation of the system.

[0045] The following is a detailed description of the use of a novel high-concentration alkali solution evaporation and concentration system of the utility model.

[0046] like Figure 1As shown, a novel high-concentration alkali solution evaporation and concentration system of the utility model has the following use process:

[0047] Alkaline solution (hereinafter referred to as feed solution) is poured into the feed tank 1, and the feed solution enters the primary preheater 21 through a pipeline for preliminary heating, and then enters the secondary preheater 22 through a pipeline for reheating.

[0048] The liquid preheated twice enters the heat exchange chamber of the first-effect evaporator 31 through a pipeline, and water vapor enters the heat exchange chamber through a pipeline to heat the liquid. Due to the high pressure in the heat exchange chamber, the boiling point of the liquid in the heat exchange chamber will increase, which will cause the liquid to overheat. After the overheated liquid enters the evaporation chamber, the pressure of the liquid drops rapidly, causing part of the liquid to flash or boil rapidly.

[0049] The first gas-liquid separator 41 separates the high-temperature feed liquid and the secondary steam generated by the flash evaporation of the feed liquid, and discharges the secondary steam into the second-effect evaporator 32 through a pipeline for recycling as a heat source, while the separated feed liquid is discharged into the second-effect evaporator 32 through a pipeline for the next evaporation.

[0050] During this process, the injected water vapor releases energy and liquefies to form water, which flows into the dirty condensed water tank 6 through a pipeline for storage; the condenser 5 extracts the non-condensable gas in the secondary steam separated by the first gas-liquid separator 41, and discharges the non-condensable gas from the vacuum system to prevent affecting the evaporation efficiency, and the generated secondary condensed water is discharged into the dirty condensed water tank 6. The secondary condensed water in the dirty condensed water tank 6 is discharged back into the primary preheater 21 for recycling.

[0051] After the feed liquid is further evaporated and concentrated by the second-effect evaporator 32 , the second gas-liquid separator 42 , the third-effect evaporator 33 and the third gas-liquid separator 43 , it is discharged from the device through the discharge pipe on the third-effect evaporator 33 for storage.

[0052] For the compressor 7, the secondary steam separated by the third separator 43 enters the compressor 7 through a pipeline, and after being pressurized at a high temperature, enters the first-effect evaporator 31 through a pipeline to be circulated and used as a heat source.

[0053] The utility model is described in detail above in conjunction with the embodiments of the drawings. A person skilled in the art can make various variations of the utility model according to the above description. Therefore, some details in the embodiments should not constitute a limitation of the utility model, and the scope of protection of the utility model shall be defined by the scope of the attached claims.

Claims

1. A new type of high-concentration alkali solution evaporation and concentration system, characterized by: include: A feed tank (1) for storing the highly concentrated alkali solution to be treated; A plurality of preheaters for preheating the highly concentrated alkali solution, wherein the preheaters are connected to the feed tank (1) via pipelines; A plurality of evaporators for evaporating and concentrating the highly concentrated alkali solution step by step, wherein the evaporators are connected to the preheater through pipelines; A plurality of gas-liquid separators are provided for separating the steam and the concentrated alkali solution in the evaporator, wherein the gas-liquid separators are located in corresponding evaporators.

2. A novel high-concentration alkali solution evaporation and concentration system according to claim 1, characterized in that: The multiple preheaters include a primary preheater (21) and a secondary preheater (22), the primary preheater (21) and the secondary preheater (22) are connected via a pipeline, and the primary preheater (21) is connected to the feed tank (1) via a pipeline.

3. A novel high-concentration alkali solution evaporation and concentration system according to claim 2, characterized in that: The multiple evaporators include a first-effect evaporator (31), a second-effect evaporator (32) and a third-effect evaporator (33) connected end to end via a pipeline, and the first-effect evaporator (31) is connected to the secondary preheater (22) via a pipeline.

4. A novel high-concentration alkali solution evaporation and concentration system according to claim 3, characterized in that: The first-effect evaporator (31) is connected to water vapor via a pipeline.

5. A novel high-concentration alkali solution evaporation and concentration system according to claim 3, characterized in that: The multiple gas-liquid separators include a first gas-liquid separator (41), a second gas-liquid separator (42) and a third gas-liquid separator (43); the first gas-liquid separator (41), the second gas-liquid separator (42) and the third gas-liquid separator (43) are respectively located inside the corresponding first-effect evaporator (31), the second-effect evaporator (32) and the third-effect evaporator (33).

6. A novel high-concentration alkali solution evaporation and concentration system according to claim 5, characterized in that: It also includes a condenser (5) for recovering energy from the generated low-temperature steam, wherein the condenser (5) is connected to the first gas-liquid separator (41), the second gas-liquid separator (42) and the third gas-liquid separator (43) through a pipeline, and the condenser (5) is connected to the secondary preheater (22) through a pipeline.

7. A novel high-concentration alkali solution evaporation and concentration system according to claim 6, characterized in that: It also includes a dirty condensed water tank (6), which is connected to the condenser (5), the primary preheater (21) and a plurality of evaporators through pipelines.

8. A novel high-concentration alkali solution evaporation and concentration system according to claim 5, characterized in that: It also includes a compressor (7), which is connected to the third gas-liquid separator (43) and the first-effect evaporator (31) through a pipeline.

9. A novel high-concentration alkali solution evaporation and concentration system according to claim 1, characterized in that: The feed tank (1) is provided with a liquid level meter and a temperature sensor.

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