Novel salt elutriation system

Abstract

The utility model relates to the technical field of chemical engineering, in particular to a novel salt elutriation system. According to the technical scheme, the device comprises a feeding tank for storing feed liquid; the plurality of preheaters are used for preheating the feed liquid; the first-effect evaporator is used for evaporating the feed liquid; the gas-liquid separator is used for separating evaporated steam and high-concentration feed liquid, and the gas-liquid separator is positioned in the first-effect evaporator; and the centrifugal machine is used for carrying out salt analysis on the high-concentration feed liquid. The device has the beneficial effects that after the wastewater is subjected to high-temperature treatment through the first-effect evaporator, steam is separated from the wastewater, the wastewater is subjected to salt precipitation, the energy utilization rate is high, and the efficiency is higher.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, in particular to a novel salt washing system. Background Art

[0002] Salt washing system is mainly used for the improvement of saline-alkali land, wastewater treatment in industrial production and the production of edible salt.

[0003] The improvement of saline-alkali land is an important background for the application of salt washing system. Saline-alkali land is widely distributed in my country, and soil salinization is the main obstacle to the optimal utilization of land resources. Drainage and salt washing are the main technical measures to improve saline-alkali land, especially medium and severe saline-alkali land. The salt washing system improves saline-alkali land by pouring water into the saline-alkali land to dissolve the soil salt, and then drains the soluble salt and alkali in the topsoil layer into the deep soil or discharges it by infiltration or leaching.

[0004] Wastewater treatment in industrial production is also an important application field of salt washing system. The salt water treatment process is mainly used for the treatment of wastewater generated during the water drive oil production process in oil fields, and has gradually expanded to the wastewater treatment fields of chemical, electric power, metallurgical and other industries. This process can effectively remove salt and impurities in wastewater, improve wastewater treatment efficiency, and provide an effective means for environmental protection.

[0005] In addition, the salt washing system also plays an important role in the production of edible salt. In the production process of crushed washed salt, countercurrent washing is an important link. This link uses the salt slurry and the brine used for washing to directly contact in opposite directions, and the brine takes away impurities, thus completing the washing process of the salt slurry. This process can retain the crystal particles and components of sun-dried sea salt. The finished product has large particles and rich taste, which is more in line with the salt consumption habits of residents in coastal areas.

[0006] With the development of industry and the improvement of environmental protection requirements, the traditional salt washing system can no longer meet the needs of high efficiency, environmental protection and energy saving. Therefore, the development of a new salt washing system has become an important task at present. Utility Model Content

[0007] The purpose of the utility model is to overcome the defects of the prior art and provide a novel salt washing system to solve the problem that the existing salt washing system can no longer meet the requirements of high efficiency, environmental protection and energy saving.

[0008] The utility model provides a novel salt washing system, and its technical scheme is as follows: it comprises: a feed tank for storing feed liquid; a plurality of preheaters for preheating the feed liquid, the preheaters are connected with the feed tank through pipelines; a single-effect evaporator for evaporating the feed liquid, the single-effect evaporator is connected with the preheater through pipelines; a gas-liquid separator for separating evaporated steam and high-concentration feed liquid, the gas-liquid separator is located in the single-effect evaporator; a centrifuge for salt analysis of high-concentration feed liquid, the centrifuge is connected with the gas-liquid separator through pipelines.

[0009] Furthermore, the preheater includes a primary preheater and a secondary preheater connected end to end through a pipeline, the primary preheater is connected to the feed tank through a pipeline, and the secondary preheater is connected to the first-effect evaporator through a pipeline.

[0010] Furthermore, it also includes a condenser for recovering energy from low-temperature steam, and the condenser is connected to the gas-liquid separator and the secondary preheater through a pipeline.

[0011] Furthermore, it also includes a vacuum system arranged on the secondary preheater and capable of generating negative pressure in the condenser.

[0012] Furthermore, it also includes a dirty condensed water tank, which is connected to the primary preheater, the condenser and the first-effect evaporator through a pipeline.

[0013] Furthermore, it also includes a compressor, which is connected to the gas-liquid separator and the first-effect evaporator through a pipeline.

[0014] Furthermore, a crystallizer for preliminary salt separation of high-concentration liquid is provided inside the gas-liquid separator.

[0015] Furthermore, the centrifuge is connected to the crystallizer and the first-effect evaporator through a pipeline.

[0016] Furthermore, the first-effect evaporator is connected to water vapor through a pipeline.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] After the wastewater is treated at high temperature by a single-effect evaporator, the steam is separated from the wastewater, and the salt is separated from the wastewater, which has high energy utilization and higher efficiency.

[0019] It can treat a wide range of wastewater, occupies a small area and has a fast processing speed.

[0020] It has long continuous operation cycle, low operating cost, few transmission parts, few consumable parts and easy maintenance.

[0021] The compressor adopts MVR technology, which can recycle all the secondary steam generated, greatly saving steam energy.

[0022] The vacuum system is small and the consumption of circulating cooling water is greatly reduced.

[0023] Low operating cost, less condensed water consumption, high energy utilization rate and high economic benefits.

[0024] It adopts intelligent control system with one-key start, one-key stop and one-key maintenance functions, and the operation is simple and easy to understand. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a system schematic diagram of a novel salt washing system of the utility model.

[0026] Legend: 1. Feed tank; 21. Primary preheater; 22. Secondary preheater; 3. First-effect evaporator; 4. Gas-liquid separator; 5. Centrifuge; 6. Crystallizer; 7. Condenser; 8. Dirty condenser; 9. Compressor. DETAILED DESCRIPTION

[0027] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] See also Figure 1 The utility model provides a new type of salt washing system to solve the problem that the existing salt washing system can no longer meet the requirements of high efficiency, environmental protection and energy saving. After the wastewater is treated at high temperature by a single-effect evaporator, the steam is separated from the wastewater, and the wastewater is subjected to salt analysis, which has high energy utilization and higher efficiency. It can treat a wide range of wastewater, occupies a small area, and has a fast processing speed. It has a long continuous operation cycle, low operating cost, few transmission parts, few consumables, and is easy to maintain. The compressor adopts MVR technology, which can recycle all the secondary steam generated, greatly saving steam energy. The vacuum system is small, and the circulating cooling water consumption ratio is greatly reduced. The operating cost is low, the condensate consumption is small, the energy utilization rate is high, and the economic benefit is high. It adopts an intelligent control system with one-button start, one-button shutdown, and one-button maintenance functions, and the operation is simple and easy to understand.

[0029] See also Figure 1 , showing a schematic diagram of a novel salt washing system of the utility model. Figure 1 , a novel salt washing system of the utility model is described.

[0030] like Figure 1As shown, a novel salt washing system of the utility model comprises: a feed tank 1 for storing feed liquid; a plurality of preheaters for preheating the feed liquid, the preheaters being connected to the feed tank 1 through pipelines; a single-effect evaporator 3 for evaporating the feed liquid, the single-effect evaporator 3 being connected to the preheater through pipelines; a gas-liquid separator 4 for separating evaporated steam and high-concentration feed liquid, the gas-liquid separator 4 being located in the single-effect evaporator 3; a centrifuge 5 for performing salt analysis on the high-concentration feed liquid, the centrifuge 5 being connected to the gas-liquid separator 4 through pipelines.

[0031] In a specific embodiment, the preheater includes a primary preheater 21 and a secondary preheater 22 connected end to end by a pipeline, the primary preheater 21 is connected to the feed tank 1 by a pipeline, and the secondary preheater 22 is connected to the first-effect evaporator 3 by a pipeline. The preheater preliminarily heats the feed liquid, thereby improving the evaporation effect in the first-effect evaporator 3.

[0032] In a specific embodiment, a condenser 7 for recovering energy from low-temperature steam is further included, and the condenser 7 is connected to the gas-liquid separator 4 and the secondary preheater 22 through a pipeline.

[0033] In a specific embodiment, a dirty condensed water tank 8 is further included, and the dirty condensed water tank 8 is connected to the primary preheater 21, the condenser 7 and the first-effect evaporator 3 through a pipeline. The dirty condensed water tank 8 is used to store the water condensed by the condenser 7; at the same time, the secondary condensed water generated by the first-effect evaporator 3 will directly enter the dirty condensed water tank 8 through a pipeline and be stored.

[0034] In a preferred embodiment, a condensate pump is provided in the dirty condensate tank 8, and the condensate is sent to the primary preheater 21 through the condensate pump to exchange heat with the feed liquid, and continues to be circulated in the system.

[0035] In a specific embodiment, a compressor 9 is further included, and the compressor 9 is connected to the gas-liquid separator 4 and the first-effect evaporator 3 through a pipeline. After the compressor 9 processes the secondary steam under high temperature and pressure, it is again transmitted to the first-effect evaporator 3 through a pipeline for use as a heat source, thereby improving the energy utilization efficiency.

[0036] In a specific embodiment, the compressor 9 is an MVR compressor.

[0037] In a specific embodiment, a crystallizer 6 for performing preliminary salt separation on the high-concentration liquid is provided inside the gas-liquid separator 4 .

[0038] In a specific embodiment, the centrifuge 5 is connected to the crystallizer 6 and the first-effect evaporator 3 through a pipeline.

[0039] In a specific embodiment, the crystallizer 6 and the centrifuge 5 are provided with discharge pipes, and the precipitated salt is discharged from the discharge pipes and stored.

[0040] In a specific embodiment, the first-effect evaporator 3 is connected to water vapor through a pipeline.

[0041] In a specific embodiment, the first-effect evaporator 3 is a first-effect forced circulation evaporator.

[0042] In a specific embodiment, the first-effect evaporator 3 includes a circulation pump, a heat exchange chamber and an evaporation chamber. The circulation pump transfers the feed liquid to the heat exchange chamber, and water vapor enters the heat exchange chamber through a pipeline to heat the feed liquid. Since the pressure in the heat exchange chamber is relatively high, the boiling point of the feed liquid in the heat exchange chamber increases, and the feed liquid will be overheated. 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.

[0043] In a specific embodiment, a vacuum system is also included on the secondary preheater 22 and is capable of generating negative pressure in the condenser 7 .

[0044] In a specific embodiment, the vacuum system forms a negative pressure in the condenser 7, so that the condenser 7 can absorb the non-condensable gas in the secondary steam separated by the gas-liquid separator 4 and discharge it through the vacuum system, thereby preventing the non-condensable gas from affecting the evaporation efficiency.

[0045] The following is a detailed description of the use of a novel salt washing system of the utility model.

[0046] like Figure 1 As shown, the utility model is a novel salt washing system, and the use process is as follows:

[0047] The salt-containing wastewater (hereinafter referred to as feed liquid) is poured into the feed tank 1, and the feed liquid enters the primary preheater 21 through a pipeline for preliminary heating, and then enters the secondary preheater 22 through a pipeline for secondary heating.

[0048] The feed liquid that has been preheated twice enters the heat exchange chamber of the first-effect evaporator 3 through a pipeline, and the water vapor enters the heat exchange chamber through a pipeline to heat the feed liquid; since the pressure in the heat exchange chamber is relatively high, the boiling point of the feed liquid in the heat exchange chamber will increase, thereby causing overheating; the superheated feed liquid enters the evaporation chamber in the next step, and the pressure of the feed liquid will drop rapidly, thereby causing part of the feed liquid to flash or boil rapidly.

[0049] The gas-liquid separator 4 completely separates the secondary steam generated by flash evaporation and the concentrated high-temperature liquid feed, and discharges the high-temperature liquid feed into the crystallizer 6. The liquid feed enters the crystallizer 6 for preliminary salt precipitation, and the salt is continuously precipitated in the crystallizer 6 and discharged through the discharge pipe.

[0050] The liquid from which salt has been precipitated in the crystallizer 6 enters the centrifuge 5 through a pipeline. The centrifuge 5 performs secondary centrifugation to remove salt from the high-concentration liquid to improve the salt washing efficiency, and discharges and stores the centrifuged salt through the discharge pipe.

[0051] The centrifuge 5 transfers the centrifuged liquid to the first-effect evaporator 3 through a pipeline for re-elution.

[0052] The vacuum system creates negative pressure in the condenser 7, thereby absorbing the non-condensable gas in the secondary steam, condensing the remaining water vapor in the non-condensable gas into water and storing it in the dirty condensed water tank 8, while the non-condensable gas is discharged through the vacuum system to prevent it from affecting the evaporation efficiency.

[0053] The secondary steam separated by the gas-liquid separator 4 is transmitted to the compressor 9 through a pipeline. The compressor 9 processes the secondary steam at a high temperature and high pressure, and returns it to the first-effect evaporator 3 through a pipeline for use as a heat source, thereby improving the energy utilization efficiency.

[0054] The water vapor in the first-effect evaporator 3 releases energy and liquefies to form secondary condensed water, and the secondary condensed water is discharged into the dirty condensed water tank 8 through a pipeline for storage.

[0055] 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 salt washing system, characterized by: include: A feed tank (1) for storing a feed liquid; A plurality of preheaters for preheating the feed liquid, wherein the preheaters are connected to the feed tank (1) via pipelines; a first-effect evaporator (3) for evaporating the feed liquid, wherein the first-effect evaporator (3) is connected to the preheater via a pipeline; a gas-liquid separator (4) for separating evaporated steam and high-concentration liquid feed, wherein the gas-liquid separator (4) is located in the first-effect evaporator (3); A centrifuge (5) for performing salt separation on a high-concentration feed liquid, wherein the centrifuge (5) is connected to the gas-liquid separator (4) via a pipeline.

2. A novel salt panning system according to claim 1, characterized in that: The preheater comprises a primary preheater (21) and a secondary preheater (22) connected end to end via a pipeline, wherein the primary preheater (21) is connected to the feed tank (1) via a pipeline, and the secondary preheater (22) is connected to the first-effect evaporator (3) via a pipeline.

3. A novel salt panning system according to claim 2, characterized in that: It also includes a condenser (7) for recovering energy from low-temperature steam, and the condenser (7) is connected to the gas-liquid separator (4) and the secondary preheater (22) through a pipeline.

4. A novel salt panning system according to claim 3, characterized in that: It also includes a vacuum system arranged on the secondary preheater (22) and capable of generating negative pressure in the condenser (7).

5. A novel salt panning system according to claim 3, characterized in that: It also includes a dirty condensed water tank (8), which is connected to the primary preheater (21), the condenser (7) and the first-effect evaporator (3) through pipelines.

6. A novel salt panning system according to claim 1, characterized in that: It also comprises a compressor (9), wherein the compressor (9) is connected to the gas-liquid separator (4) and the first-effect evaporator (3) through a pipeline.

7. A novel salt panning system according to claim 1, characterized in that: The gas-liquid separator (4) is provided inside with a crystallizer (6) for performing preliminary salt separation on the high-concentration liquid.

8. A novel salt panning system according to claim 7, characterized in that: The centrifuge (5) is connected to the crystallizer (6) and the first-effect evaporator (3) through pipelines.

9. A novel salt panning system according to claim 1, characterized in that: The first-effect evaporator (3) is connected to water vapor via a pipeline.

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