Industrial waste liquid shrinkage treatment system by utilizing solar energy and negative pressure evaporation

Abstract

The invention discloses an industrial waste liquid shrinkage treatment system by solar energy and negative pressure evaporation, which comprises a waste liquid tank, a concentration tank, a solar waste liquid heating unit and a negative pressure evaporation unit, the solar waste liquid heating unit is connected with the waste liquid tank through a pipeline, and the negative pressure evaporation unit is connected with the solar waste liquid heating unit through a pipeline. The concentration tank is in pipeline connection with the negative pressure evaporation unit, the solar waste liquid heating unit, the negative pressure evaporation unit and the concentration tank form a group of industrial waste liquid concentration system, and a plurality of groups of solar waste liquid heating units, the negative pressure evaporation units and the concentration tank are connected in series to form a multi-stage industrial waste liquid concentration system. The invention belongs to the technical field of industrial waste liquid treatment, and particularly relates to a solar heating and negative pressure evaporation concentration device which can work in series to improve the concentration of treated waste liquid and can also work in parallel to improve the amount of treated waste liquid.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial waste liquid treatment, and in particular relates to a system for reducing the volume of industrial waste liquid by utilizing solar energy and negative pressure evaporation. Background Art

[0002] A large amount of industrial waste liquid is generated during the production process in the industrial field. In the context of the era of zero emissions, it is very important to treat these waste liquids harmlessly. At present, the most direct treatment method is to incinerate the waste liquid. This treatment method is simple and crude. Incineration of wastewater will waste a lot of energy and emit a large amount of carbon dioxide into the environment. Most of the heat energy from fuel combustion becomes the latent heat of vaporization that turns water into steam. A large amount of fuel is wasted because the waste water is not reduced in volume. For the treatment of chemical waste liquid, vacuum distillation technology is used to extract useful by-products, which not only reduces the waste liquid but also reuses the valuable by-products in the waste liquid.

[0003] Incineration of wastewater is widely used, mainly because it is simple and direct. Compared with membrane treatment of wastewater, its subsequent maintenance and use costs are lower. However, directly incinerating the entire amount of wastewater is obviously not an economical way to treat wastewater. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides an industrial waste liquid reduction treatment system using solar energy and negative pressure evaporation, which is composed of a solar heating and negative pressure evaporation concentration device, which can work in series to increase the concentration of the treated waste liquid, and can also work in parallel to increase the amount of waste liquid treated.

[0005] The technical solution adopted by the present invention is as follows: a system for reducing the volume of industrial waste liquid by using solar energy and negative pressure evaporation, comprising a waste liquid tank, a concentration tank, a solar waste liquid heating unit and a negative pressure evaporation unit, wherein the solar waste liquid heating unit is connected to the waste liquid tank through a pipeline, the negative pressure evaporation unit is connected to the solar waste liquid heating unit through a pipeline, the concentration tank is connected to the negative pressure evaporation unit pipeline, the solar waste liquid heating unit, the negative pressure evaporation unit and the concentration tank form a group of industrial waste liquid concentration system, multiple groups of the solar waste liquid heating units, negative pressure evaporation units and concentration tanks are connected in series to form a multi-stage industrial waste liquid concentration system, and multiple groups of the solar waste liquid heating units, negative pressure evaporation units and concentration tanks are connected in parallel to form a large-capacity industrial waste liquid concentration system.

[0006] Furthermore, the solar waste liquid heating unit includes a solar heating device, an auxiliary electric heating device and a water pump. The solar heating device is connected to the waste liquid tank through a pipeline, the auxiliary electric heating device is arranged in the solar heating device, and the water pump inlet is connected to the solar heating device outlet through a pipeline.

[0007] Furthermore, the negative pressure evaporation unit includes a negative pressure evaporation tank, a waste liquid splashing device, a vacuum pump and an air cooling device. The waste liquid splashing device is arranged in the negative pressure evaporation tank, the waste liquid splashing device is connected to the outlet of the water delivery pump through a pipeline, the vacuum pump inlet is connected to the gas side of the negative pressure evaporation tank through a pipeline, the vacuum pump outlet is connected to the air cooler inlet through a pipeline, the liquid side of the negative pressure evaporation tank is connected to the inlet of the solar heater through a pipeline, and a circulation loop is formed between the negative pressure evaporation tank and the solar heater through the pipeline.

[0008] Furthermore, the concentration tank is connected to the negative pressure evaporation tank through a pipeline, and the concentration tank is connected to a waste liquid pump through a pipeline.

[0009] Furthermore, the auxiliary electric heating device, the water delivery pump, the vacuum pump, the waste liquid pump and the electric control valves arranged on the pipeline are all connected to the DCS device.

[0010] In order to better understand the present application, the principle of the present application is described below:

[0011] Water can be concentrated by evaporation. Heating water can cause it to evaporate, but evaporating water requires a lot of energy. Solar energy can be used to heat liquids. For general-purpose solar heating, high-cost solar heating devices, such as concentrated solar heating devices, are usually not used, so the heated liquid usually does not reach a very high temperature and reaches a boiling state. Ordinary solar heating devices can usually heat water to about 80°C, but it has not yet reached a boiling state. Sending the hot water heated by solar energy to a closed water storage tank and continuously evacuating the water storage tank can cause the water in the tank to evaporate and concentrate by self-boiling.

[0012] After adopting the above structure, the beneficial effects of the present invention are as follows: the present invention proposes a system for reducing the volume of industrial waste liquid by using solar energy and negative pressure evaporation. If the waste liquid can be reduced by 50%, half of the cost of incineration treatment of the waste liquid can be saved. Taking a factory with a daily output of 1 ton of waste liquid as an example, the annual cost of treating the waste liquid by incineration is about 1 million yuan. If the waste liquid is reduced by 60% by using solar energy heating and negative pressure evaporation reduction technology, 600,000 yuan of waste liquid incineration treatment costs can be saved. The cost of waste liquid treatment is greatly reduced, and the economic and energy-saving and emission reduction effects are significant. The solar energy heating and negative pressure evaporation concentration device can work in series to increase the concentration of the waste liquid being treated. It can also work in parallel to increase the amount of waste liquid treated, and realize efficient and economical reduction of industrial waste liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0014] Figure 1 This is a schematic diagram of the overall structure of a system for reducing the volume of industrial waste liquid using solar energy and negative pressure evaporation proposed by the present invention.

[0015] In the attached picture:

[0016] 1 waste liquid tank, 100 waste liquid tank waste liquid inlet valve, 101 waste liquid tank waste liquid outlet valve 1, 102 waste liquid tank waste liquid outlet valve 2, 103 first-level solar heating negative pressure evaporation tank recirculation valve, 104 first-level negative pressure evaporation tank vacuum breaking valve, 105 first-level negative pressure evaporation tank exhaust valve;

[0017] 2 first-level concentration tank, 200 first-level concentration tank inlet valve, 201 first-level concentration tank waste liquid outlet valve 1, 202 first-level concentration tank waste liquid outlet valve 2, 203 second-level solar heating negative pressure evaporation tank recirculation valve, 204 second-level negative pressure evaporation tank vacuum breaking valve, 205 second-level negative pressure evaporation tank exhaust valve;

[0018] 3 secondary concentration tank, 300 secondary concentration tank inlet valve, 301 secondary concentration tank waste liquid outlet valve;

[0019] 4 first-stage solar heating device, 41 second-stage solar heating device, 400DCS device 401 air cooler exhaust valve to air, 402 air cooler liquid side discharge valve;

[0020] 5 first-level auxiliary electric heating device, 51 second-level auxiliary electric heating device;

[0021] 6 primary water delivery pumps, 61 secondary water delivery pumps;

[0022] 7 first-stage negative pressure evaporation and splashing device, 71 second-stage negative pressure evaporation and splashing device;

[0023] 8 first-level negative pressure evaporation tank, 81 second-level negative pressure evaporation tank;

[0024] 9 Vacuum pump;

[0025] 10 air cooler;

[0026] 11 pipelines;

[0027] 12 Waste pump. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0030] like Figure 1 As shown, a system for reducing the volume of industrial waste liquid by using solar energy and negative pressure evaporation is provided, which comprises a waste liquid tank 1, a concentration tank 2, a solar waste liquid heating unit and a negative pressure evaporation unit, wherein the solar waste liquid heating unit is connected to the waste liquid tank 1 through a pipeline, the negative pressure evaporation unit is connected to the solar waste liquid heating unit through a pipeline, the concentration tank is connected to the negative pressure evaporation unit through a pipeline, the solar waste liquid heating unit, the negative pressure evaporation unit and the concentration tank form a group of industrial waste liquid concentration system, multiple groups of the solar waste liquid heating units, negative pressure evaporation units and concentration tanks are connected in series to form a multi-stage industrial waste liquid concentration system, and multiple groups of the solar waste liquid heating units, negative pressure evaporation units and concentration tanks are connected in parallel to form a large-capacity industrial waste liquid concentration system.

[0031] For the solar waste liquid heating unit, the waste liquid tank 1 is connected to the solar heating device 4 through a pipeline, an auxiliary electric heating device 5 is provided in the solar heating device 4, and the outlet of the solar heating device 4 is connected to the inlet of the water delivery pump 6 through a pipeline;

[0032] For the negative pressure evaporation unit, a waste liquid splashing device is provided in the negative pressure evaporation tank 8, the outlet of the water delivery pump 6 is connected to the waste liquid splashing device in the negative pressure evaporation tank 8 through a pipeline, and the inlet of the vacuum pump 9 is connected to the gas side of the negative pressure evaporation tank 8 through a pipeline; the outlet of the vacuum pump 9 is connected to the inlet of the air cooler 10 through a pipeline;

[0033] Furthermore, the liquid condensed at the outlet of the air cooler 10 can be reused or discharged after passing the test; the exhaust gas of the air cooler 10 can be discharged after passing the test.

[0034] Furthermore, the liquid side of the negative pressure evaporation tank 8 is connected to the inlet of the solar heating device 4 through a pipeline, thereby forming a waste liquid heating and recycling system.

[0035] The negative pressure evaporation tank 8 is connected to the primary concentration tank 2 through a pipeline;

[0036] As a preferred embodiment of the present invention, this embodiment is provided with two groups of concentration tanks:

[0037] The waste liquid tank 1 is connected to the inlet of the secondary solar heating device 41 through a pipeline, so that the devices can work in parallel.

[0038] Furthermore, the first-level concentration tank 2 is connected to the inlet of the second-level solar heating device 41 through a pipeline, the outlet of the second-level solar heating device 41 is connected to the inlet of the water pump 61 through a pipeline, the outlet of the water pump 61 is connected to the second-level negative pressure evaporation splashing device 71 in the second-level negative pressure evaporation tank 81 through a pipeline, and the gas side of the second-level negative pressure evaporation tank 81 is connected to the inlet of the vacuum pump 9 through a pipeline (sharing a vacuum pump and air cooler with the first-level negative pressure evaporation device).

[0039] The liquid side of the secondary negative pressure evaporation tank 81 is connected to the secondary concentration tank 3 through a pipeline, the primary concentration tank 2 is connected to the waste liquid pump 12 (to the incinerator) through a pipeline, and the secondary concentration tank 3 is connected to the waste liquid pump 12 (to the incinerator) through a pipeline.

[0040] Furthermore, the liquid side of the secondary negative pressure evaporation tank 81 is connected to the inlet of the secondary solar heating device 41 through a pipeline, thereby forming a waste liquid heating and recycling system.

[0041] Furthermore, the primary auxiliary electric heating device 5, the secondary auxiliary electric heating device 51, the primary water pump 6, the secondary water pump 61, the vacuum pump 9, the waste liquid pump 12 and the electrically controlled valves arranged on the pipeline are all connected to the DCS device 400 to realize automatic control of the device.

[0042] like Figure 1 As shown, when used specifically, the serial operation mode in this embodiment is as follows:

[0043] Step 1: Valve 101 is closed, valve 102 is open, valve 103 is closed, valve 200 is closed, valve 104 is open, valve 105 is closed, valve 205 is closed.

[0044] Step 2: Start the water delivery pump 6 to inject waste liquid into the negative pressure evaporation tank 8.

[0045] Step 3: When the predetermined high water level is reached, valve 103 is opened, valve 102 is closed, valve 104 is closed, the waste liquid is filled, and the waste liquid is heated and recycled.

[0046] Step 4: After starting the vacuum pump 9, the 105 valve opens.

[0047] Step 5: Open valve 402, take samples for analysis, and discharge or reuse after passing the test; open valve 401, take samples for analysis, and discharge after passing the test.

[0048] Step 6: During the sunshine period, the water pump and vacuum pump run continuously, and the waste liquid can be continuously concentrated and treated.

[0049] Step 7: When there is no sunshine for a long period of time, the auxiliary electric heating device 5 can be turned on to heat the waste liquid and keep the device working normally.

[0050] Step 8: When the liquid level in the negative pressure evaporation tank 8 drops to a low liquid level, the vacuum pump 9 is stopped, the valve 104 is opened, and the valve 105 is closed.

[0051] Step nine: Stop water pump 6 and close valve 103.

[0052] Step 10: Open valve 200 and discharge the concentrated waste liquid to the first-level concentration tank 2.

[0053] Step 11: After the negative pressure evaporation tank 8 is emptied, the 200 valve is closed.

[0054] Step 12: Repeat steps 1 to 11 to concentrate and reduce the waste liquid for the first time.

[0055] Step 13: The waste liquid concentration procedure in the primary concentration tank 2 is carried out in full accordance with steps 1 to 11.

[0056] Step 14: Repeat steps 1 to 11 to concentrate and reduce the waste liquid in the primary concentration tank 2 for the second time.

[0057] Step 15: Valve 300 is opened to discharge the secondary concentrated waste liquid into the secondary concentration tank 3.

[0058] Step 16: After the negative pressure evaporation tank 81 is emptied, the valve 300 is closed.

[0059] Step 17: Close valve 201, open valve 301, start waste liquid pump 12, and send waste liquid to the boiler for incineration.

[0060] The parallel operation mode in this embodiment is as follows:

[0061] Step 18: Valve 202 is closed, valve 101 is opened, valve 102 is opened, and the primary and secondary solar heating and negative pressure evaporation concentration devices simultaneously concentrate the waste liquid in waste liquid tank 1.

[0062] Step 19: Repeat steps 1 to 11 to form a parallel operation mode of the primary concentration device and the secondary concentration device.

[0063] Step 20: When the water levels in the primary concentration tank 2 and the secondary concentration tank 3 reach a certain level, valve 201 is opened, valve 301 is opened, and the waste liquid pump 12 is turned on to send the waste liquid to the incinerator for incineration.

[0064] The above description of the embodiments is to facilitate the understanding and use of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A system for reducing the volume of industrial waste liquid by using solar energy and negative pressure evaporation, characterized in that: It includes a waste liquid tank, a concentration tank, a solar waste liquid heating unit and a negative pressure evaporation unit. The solar waste liquid heating unit is connected to the waste liquid tank through a pipeline, the negative pressure evaporation unit is connected to the solar waste liquid heating unit through a pipeline, and the concentration tank is connected to the negative pressure evaporation unit through a pipeline. The solar waste liquid heating unit, the negative pressure evaporation unit and the concentration tank form a group of industrial waste liquid concentration system. Multiple groups of the solar waste liquid heating units, negative pressure evaporation units and concentration tanks are connected in series to form a multi-stage industrial waste liquid concentration system. Multiple groups of the solar waste liquid heating units, negative pressure evaporation units and concentration tanks are connected in parallel to form a large-capacity industrial waste liquid concentration system.

2. The system for reducing the volume of industrial waste liquid by using solar energy and negative pressure evaporation according to claim 1 is characterized in that: The solar waste liquid heating unit includes a solar heating device, an auxiliary electric heating device and a water pump. The solar heating device is connected to the waste liquid tank through a pipeline, the auxiliary electric heating device is arranged in the solar heating device, and the water pump inlet is connected to the solar heating device outlet through a pipeline.

3. The system for reducing the volume of industrial waste liquid by using solar energy and negative pressure evaporation according to claim 2 is characterized in that: The negative pressure evaporation unit comprises a negative pressure evaporation tank, a waste liquid splashing device, a vacuum pump and an air cooling device. The waste liquid splashing device is arranged in the negative pressure evaporation tank, the waste liquid splashing device is connected to the outlet of the water delivery pump through a pipeline, the vacuum pump inlet is connected to the gas side of the negative pressure evaporation tank through a pipeline, the vacuum pump outlet is connected to the air cooler inlet through a pipeline, the liquid side of the negative pressure evaporation tank is connected to the inlet of the solar heater through a pipeline, and a circulation loop is formed between the negative pressure evaporation tank and the solar heater through the pipeline.

4. The system for reducing the volume of industrial waste liquid by using solar energy and negative pressure evaporation according to claim 3 is characterized in that: The concentration tank is connected to the negative pressure evaporation tank through a pipeline, and the concentration tank is connected to a waste liquid pump through a pipeline.

5. The system for reducing the volume of industrial waste liquid by using solar energy and negative pressure evaporation according to claim 4 is characterized in that: The auxiliary electric heating device, the water delivery pump, the vacuum pump, the waste liquid pump and the electric control valves arranged on the pipeline are all connected to the DCS device.

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