Evaporation desalting device for industrial high-salinity wastewater

Abstract

The utility model relates to an evaporation desalting device for industrial high-salinity wastewater, which belongs to an environment-friendly wastewater treatment device, can solve the technical problems of high use cost and the like in the existing desalting of various industrial wastewater, and comprises an alkali storage tank, an acid storage tank, a wastewater storage tank, a batching tank, an acid head tank, an alkali head tank, a raw material tank, a circulating water tank, a cooling tower, a cooling module and an evaporation module, the device comprises a water source heat pump, an automatic control cabinet, a condensate water tank, a crystallization kettle, a centrifugal machine, a mother liquor ground groove, a centrifugal fan and a condenser, by means of the evaporation system, water in wastewater can be evaporated out to the maximum extent, salt is left in concentrated liquid, after specified requirements are met, the wastewater is discharged to be cooled, crystallized and separated, solid salt can be sold as a by-product, mother liquid is recycled, zero discharge of the wastewater is achieved, the problem that conventional equipment is blocked is solved by applying the technology, and the wastewater treatment cost is reduced. The problem of salt concentration in the wastewater does not need to be considered.

Description

Technical Field

[0001] The utility model belongs to the waste water environmental protection treatment device, and particularly relates to an industrial high-salt waste water evaporation and desalination device. Background Technique

[0002] High-salt waste water refers to waste water containing organic matter and with the mass fraction of total dissolved solids TDS ≥ 3.5%, including high-salt domestic waste water and high-salt industrial waste water.

[0003] It mainly comes from direct industrial production, domestic water use, food processing plants, chemical plants, and the collection and processing of oil and natural gas. In addition to containing organic pollutants, these waste waters also contain a large amount of inorganic salts, such as Cl - , SO4 2- , Na + , Ca 2+ and other ions.

[0004] If directly discharged without treatment, it will surely cause great harm to water body organisms, domestic drinking water, and industrial and agricultural production water. However, in the conventional treatment methods, the salt water concentration cannot be too high, and there is an urgent need to develop process technologies for treating higher-concentration high-salt waste water.

[0005] For the treatment of high-salt waste water, the existing technologies mainly have the following several solutions, such as low-temperature multi-effect plate evaporation and concentration desalination of high-salt waste water, multi-effect evaporation, multi-stage flash evaporation, vapor compression distillation, membrane distillation desalination, reverse osmosis desalination, biochemical desalination treatment, etc. The problems and disadvantages of the existing high-salt waste water treatment technologies are mainly high costs. Content of the Utility Model

[0006] The utility model provides an industrial high-salt waste water evaporation and desalination device to solve the technical problems such as high use costs existing in the desalination of various existing industrial waste waters.

[0007] The utility model adopts the following technical scheme:

[0008] An industrial high-salt waste water evaporation and desalination device includes an alkali storage tank, an acid storage tank, a waste water storage tank, a batching tank, an acid high-level tank, an alkali high-level tank, a raw material tank, a circulating water tank, a cooling tower, a cooling module, an evaporation module, a water source heat pump, an automatic control cabinet, a condensate tank, a crystallization kettle, a centrifuge, a mother liquor sump, a centrifugal fan, and a condenser;

[0009] The alkali storage tank and the acid storage tank are respectively connected to the alkali high-level tank and the acid high-level tank, and the alkali high-level tank and the acid high-level tank are connected to the batching tank; the cooling module is provided with a condenser;

[0010] The described wastewater storage tank is connected to a batching tank, the batching tank is connected to a raw material tank, the raw material tank is connected to an evaporation module through Pipeline 1, the evaporation module is connected to the condenser inlet in the cooling module, the condensate outlet of the condenser is connected to a condensate tank through Pipeline 2, the condenser exhaust port is connected to the evaporation module, the cooling module is connected to a circulating water tank, the circulating water tank is connected to a cooling tower, the circulating water tank is connected to a water source heat pump, and the water source heat pump is connected to the evaporation module.

[0011] The evaporation module is connected to a crystallization kettle through a pipeline and a circulating pump, the crystallization kettle is connected to a centrifuge, the liquid discharge port of the centrifuge is connected to a mother liquor sump, and the mother liquor sump is connected to the raw material tank through a return pipe.

[0012] Further, a pH on-line monitor is installed on the batching tank to control the inflow quantity of materials in the acid high-level tank and the alkali high-level tank according to the pH value.

[0013] Further, a stirring device is installed in the batching tank, and the stirring device stirs during the process of adding alkaline and acidic solutions to make the pH value of the materials meet the specified requirements.

[0014] Further, a liquid level gauge is installed on the evaporation module to control the inflow quantity of materials by monitoring the liquid level.

[0015] Further, a spraying device is installed inside the evaporation module, and the spraying device is connected to the water source heat pump to spray the heated materials to improve the evaporation speed.

[0016] Further, the circulating water tank and the cooling tower are connected through an inlet pipe 1 and an outlet pipe 1 to realize the cooling water circulation between them. When the water temperature in the circulating water tank is relatively high, cooling treatment is required.

[0017] Further, the circulating water tank and the water source heat pump are connected through an inlet pipe 2 and an outlet pipe 2 to realize the water circulation between them, and this circulating water provides heat for the heating module.

[0018] Further, the circulating water tank and the cooling module are connected through an inlet pipe 3 and an outlet pipe 3 to realize the water circulation between them.

[0019] Further, the water source heat pump and the evaporation module are connected through an inlet pipe 4 and an outlet pipe 4 to realize the water circulation between them, and the materials in the evaporation module are heated through pump circulation.

[0020] Further, except for the external frame which is a metal frame, all the internal materials used in the evaporation module are made of PP plastic.

[0021] The beneficial effects of the present utility model are as follows:

[0022] 1. The utility model saves energy consumption by using a water source heat pump unit to provide heat. Correspondingly, during the operation of the system, while the unit generates heat, it absorbs heat from the circulating water and cools the circulating water, providing energy for subsequent cooling of the circulating water; during the operation of the system, the heat taken out of the evaporation system by the cooling water is supplemented to the circulating water, thereby providing heat source for the circulating water, realizing the recycling of energy, and thus achieving the purpose of energy conservation;

[0023] 2. Through the evaporation system, the utility model can maximize the evaporation of water in the wastewater, and the salt remains in the concentrated liquid. After reaching the specified requirements, it is discharged for cooling crystallization separation. The solid salt can be sold as a by-product, and the mother liquor is recycled, realizing zero discharge of wastewater. The application of this technology solves the problem of blockage of conventional equipment and does not need to consider the problem of the salt concentration in the wastewater.

[0024] 3. The equipment material used in the evaporation module of the utility model is PP plastic material, which is not affected by the quality of the wastewater and can treat most industrial wastewaters. Description of the Drawings

[0025] Figure 1 is a schematic structural diagram of the utility model;

[0026] Wherein: 1 - alkali storage tank; 2 - acid storage tank; 3 - wastewater storage tank; 4 - batching tank; 5 - acid elevated tank; 6 - alkali elevated tank; 7 - raw material tank; 8 - circulating water tank; 9 - cooling tower; 10 - cooling module; 11 - evaporation module; 12 - water source heat pump; 13 - automatic control cabinet; 14 - condensate tank; 15 - crystallization kettle; 16 - centrifuge; 17 - mother liquor sump; 18 - centrifugal fan; 19 - condenser; 20 - circulation pump; 21 - first water inlet pipe; 22 - first water outlet pipe; 23 - second water inlet pipe; 24 - second water outlet pipe; 25 - third water inlet pipe; 26 - third water outlet pipe; 27 - fourth water inlet pipe; 28 - fourth water outlet pipe; 29 - spraying device; 30 - first pipeline; 31 - second pipeline; 32 - stirring device; 33 - liquid level gauge. Detailed Embodiments

[0027] In combination with the drawings, the utility model is further described.

[0028] As shown in the figure, an industrial high-salt wastewater evaporation and desalination device includes an alkali storage tank 1, an acid storage tank 2, a wastewater storage tank 3, a batching tank 4, an acid elevated tank 5, an alkali elevated tank 6, a raw material tank 7, a circulating water tank 8, a cooling tower 9, a cooling module 10, an evaporation module 11, a water source heat pump 12, an automatic control cabinet 13, a condensate tank 14, a crystallization kettle 15, a centrifuge 16, a mother liquor sump 17, a centrifugal fan 18, and a condenser 19;

[0029] The alkali storage tank 1 and the acid storage tank 2 are respectively connected to the alkali high-level tank 6 and the acid high-level tank 5, and the alkali high-level tank 6 and the acid high-level tank 5 are connected to the batching tank 4.

[0030] The wastewater storage tank 3 is connected to the batching tank 4, the batching tank 4 is connected to the raw material tank 7, the raw material tank 7 is connected to the evaporation module 11, the evaporation module 11 is connected to the inlet of the condenser 19 inside the cooling module 10, the condensate outlet of the condenser 19 is connected to the condensate tank 14, the exhaust port of the condenser 19 is connected to the evaporation module 11, the cooling module 10 is connected to a circulating water tank 8, the circulating water tank 8 is connected to a cooling tower 9, the circulating water tank 8 is connected to a water source heat pump 12, and the water source heat pump 12 is connected to the evaporation module 11.

[0031] The evaporation module 11 is connected to the crystallization kettle 15 through a pipeline and a circulating pump 20, the crystallization kettle 15 is connected to a centrifuge 16, the liquid discharge port of the centrifuge 16 is connected to the mother liquor sump 17, and the mother liquor sump 17 is connected to the raw material tank 7 through a return water pipe.

[0032] Further, the condensate outlet of the condenser 19 is connected to the condensate tank 14 through a pipeline two 31.

[0033] Further, the raw material tank 7 is connected to the evaporation module 11 through a pipeline one 30.

[0034] Further, a pH on-line monitor is installed on the batching tank 4, and the inflow quantity of the materials in the acid high-level tank 5 and the alkali high-level tank 6 is controlled by the pH value;

[0035] Further, a stirring device 32 is installed in the batching tank 4, and the stirring device 32 stirs during the process of adding alkaline and acidic solutions;

[0036] Further, a liquid level gauge 33 is installed on the evaporation module 11, and the inflow quantity of the materials is controlled by monitoring the liquid level;

[0037] Further, a spraying device 29 is installed inside the evaporation module 11, and the spraying device 29 is connected to the water source heat pump 12,

[0038] Further, the circulating water tank 8 and the cooling tower 9 are connected through an inlet pipe one 21 and an outlet pipe one 22 to realize the cooling water circulation between them,

[0039] Further, the circulating water tank 8 and the water source heat pump 12 are connected through an inlet pipe two 23 and an outlet pipe two 24 to realize the water circulation between them,

[0040] Further, the circulating water tank 8 and the cooling module 10 are connected through an inlet pipe three 25 and an outlet pipe three 26 to realize the water circulation between them,

[0041] Furthermore, the water source heat pump 12 and the evaporation module 11 are connected through the fourth water inlet pipe 27 and the fourth water outlet pipe 28 to realize the water circulation between them.

[0042] Usage method: First, load alkaline solution and acidic solution into the alkali storage tank 1 and the acid storage tank 2 respectively, so as to transfer the alkali liquid and the acid liquid into the alkali high-level tank 6 and the acid high-level tank 5 for standby respectively; transfer the high-salt wastewater from the wastewater storage tank 3 into the batching tank 4, and pump the alkali liquid or the acid liquid into the batching tank 4 accordingly for neutralization reaction, and then transfer it into the raw material tank 7 for standby; then transfer the materials in the raw material tank 7 into the evaporation module 11. After the materials in the evaporation module 11 are heated by the water source heat pump 12, start the centrifugal fan 18 to send the water vapor generated in the evaporation module 11 into the condenser 19 for condensation; the condensed water flows into the condensate tank 14 by self-flow through the pipeline, and the condensed water in the condensate tank 14 enters the biochemical system for COD removal treatment; the gas condensed by the condenser 19 continues to enter the evaporation module 11. After reaching the specified concentration, it is transferred into the crystallization kettle 15 by the circulation pump 20 for cooling crystallization. After cooling crystallization, the materials are discharged into the centrifuge 16 for solid-liquid separation. The solid is sold as a by-product, and the liquid is transferred into the mother liquor sump 17 as the mother liquor and then sent back to the raw material tank 7 for reuse, realizing zero discharge of wastewater.

[0043] The heat source of the water source heat pump 12 is the water in the circulating water tank 8. The circulating water tank 8 also absorbs the heat released during the condensation process in the cooling module 10 to realize the recovery and utilization of energy. At the same time, when there is too much heat in the circulating water tank 8, the cooling tower 9 is needed to cool down.

[0044] The circulating water tank 8 is connected to the water source heat pump 12 through a circulating pipeline. The circulating water tank 8 is filled with circulating water, which provides heat for the water source heat pump 12. Through the water source heat pump 12, the water temperature can be raised to 80 °C, which is sufficient to make the evaporation module 11 work.

Claims

1. An industrial high-salt wastewater evaporation and desalination device, characterized in that: It includes an alkali storage tank (1), an acid storage tank (2), a wastewater storage tank (3), a batching tank (4), an acid elevated tank (5), an alkali elevated tank (6), a raw material tank (7), a circulating water tank (8), a cooling tower (9), a cooling module (10), an evaporation module (11), a water source heat pump (12), an automatic control cabinet (13), a condensate tank (14), a crystallization kettle (15), a centrifuge (16), a mother liquor sump (17), a centrifugal fan (18), and a condenser (19); The said wastewater storage tank (3) is connected to the batching tank (4), the said batching tank (4) is connected to the raw material tank (7), the said raw material tank (7) is connected to the evaporation module (11) through Pipeline 1 (30), the evaporation module (11) is connected to the air inlet of the condenser (19) inside the cooling module (10), the condensate outlet of the said condenser (19) is connected to the condensate tank (14) through Pipeline 2 (31), the exhaust port of the said condenser (19) is connected to the evaporation module (11), the said cooling module (10) is connected to the circulating water tank (8), the said circulating water tank (8) is connected to the cooling tower (9), the said circulating water tank (8) is connected to the water source heat pump (12), and the said water source heat pump (12) is connected to the evaporation module (11); The said evaporation module (11) is connected to the crystallization kettle (15) through a pipeline and a circulation pump (20), the crystallization kettle (15) is connected to the centrifuge (16), the liquid discharge port of the centrifuge (16) is connected to the mother liquor sump (17), and the mother liquor sump (17) is connected to the raw material tank (7) through a return pipe.

2. An industrial high-salt wastewater evaporation and desalination device according to claim 1, characterized in that: The said alkali storage tank (1) and acid storage tank (2) are respectively connected to the alkali elevated tank (6) and acid elevated tank (5), and the alkali elevated tank (6) and acid elevated tank (5) are connected to the batching tank (4).

3. An industrial high-salt wastewater evaporation and desalination device according to claim 1, characterized in that: An on-line pH monitor is installed on the batching tank.

4. An industrial high-salt wastewater evaporation and desalination device according to claim 1, characterized in that: A stirring device (32) is installed inside the batching tank (4).

5. An industrial high-salt wastewater evaporation and desalination device according to claim 1, characterized in that: A liquid level gauge (33) is installed on the said evaporation module (11).

6. The industrial high-salt wastewater evaporation and desalination device according to claim 1, wherein: A spraying device (29) is installed inside the said evaporation module (11), and the spraying device (29) is connected to the water source heat pump (12).

7. An industrial high-salt wastewater evaporation and desalination device according to claim 1, characterized in that: The said circulating water tank (8) and the cooling tower (9) are connected through an inlet pipe 1 (21) and an outlet pipe 1 (22).

8. An industrial high-salt wastewater evaporation and desalination device according to claim 1, characterized in that: The said circulating water tank (8) and the water source heat pump (12) are connected through an inlet pipe 2 (23) and an outlet pipe 2 (24).

9. An industrial high-salt wastewater evaporation and desalination device according to claim 1, characterized in that: The said circulating water tank (8) and the cooling module (10) are connected through an inlet pipe 3 (25) and an outlet pipe 3 (26).

10. An industrial high-salt wastewater evaporation and desalination device according to claim 1, characterized in that: The said water source heat pump (12) and the evaporation module (11) are connected through an inlet pipe 4 (27) and an outlet pipe 4 (28).

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