Reducing device for high-oil evaporated concentrated liquor

Abstract

The utility model discloses a reduction device for high-oil evaporated concentrated liquor, which is characterized in that the bottom of a concentrated liquor storage tank is connected to a strong evaporation device through a pipeline, the strong evaporation device is an airtight cavity, the top of the strong evaporation device is connected with a vacuum air pump through a pipeline, the vacuum air pump is connected with a condenser, and a liquid outlet pipeline of the condenser is connected with a condensate water tank; an inclined spiral stirring mechanism is arranged in the strong evaporation device, a storage tank is arranged at the tail part of the spiral stirring mechanism, and a pressure gauge and a pressure release valve are also arranged on the strong evaporation device. According to the utility model, the pressure in the strong evaporation device is reduced to negative pressure through the vacuum air pump, the inclined spiral stirring mechanism is utilized to enable the evaporated concentrated liquor to be in a stirring state, and the concentrated liquor is lifted along the spiral stirring mechanism and thrown into the cavity of the strong evaporation device, so that an oil film on the surface layer of the concentrated liquor is prevented from hindering water evaporation, and the high-temperature evaporated concentrated liquor utilizes waste heat of the high-temperature evaporated concentrated liquor; and secondary evaporation is carried out under negative pressure, so that the moisture content in the high-oil concentrated liquor is effectively reduced, the additional treatment cost required for evaporating the concentrated liquor is reduced, and the efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of industrial wastewater and leachate wastewater treatment, and specifically relates to a device for reducing high-oil evaporation concentrated liquid. Background Art

[0002] At present, hazardous waste disposal companies generally use MVR, single-effect or multi-effect evaporation systems to evaporate wastewater containing high oil, high salt, and high microbial toxicity, thereby separating such industrial wastewater into low-pollution evaporation condensate and high-pollution evaporation concentrate. The evaporation condensate can enter the biochemical system for biochemical treatment, while the high-pollution evaporation concentrate cannot be biochemically treated and can only enter the incineration system as a matching material for incineration and harmless treatment. Since the high-pollution evaporation concentrate still has a large amount of water and impurities at this time, the calorific value of the material is generally lower than the expected calorific value of the matching material, and it cannot be directly sprayed into the rotary kiln or the secondary combustion chamber for treatment through a waste liquid spray gun. If it enters the material pit, it will cause a significant increase in the moisture content in the material pit, resulting in an overall decrease in the calorific value of the material pit, increasing the difficulty of matching operations and causing increased loss of refractory materials in the rotary kiln, resulting in extremely high processing costs.

[0003] The Chinese patent application number 202110202285.7 discloses a device for treating production line wastewater by combining a heat pump concentration and drying device. The negative pressure drying equipment uses a steam heat source and mechanical stirring to dry the concentrated waste liquid under an extreme vacuum environment, and the condensed water is recycled and reused, and the waste liquid is converted from liquid to solid salt. However, this device is only suitable for industrial wastewater that does not contain oil or has a very low oil content. If the concentrated waste liquid has a high oil content, it is easy to form a water-oil stratification, and the oil layer forms an oil seal above the water layer, making it difficult for the water vapor in the waste liquid to evaporate. Summary of the invention

[0004] In view of the above problems existing in the prior art, the utility model provides a device for reducing the amount of high-oil evaporation concentrate. For concentrated waste liquid with high oil content, the oil seal is broken by an inclined spiral stirring mechanism, the evaporation ratio of water in the waste liquid is increased, and the amount of evaporated concentrate is reduced or directly dried.

[0005] The purpose of the utility model is achieved in the following ways:

[0006] A device for reducing the volume of high-oil evaporation concentrate comprises a concentrate storage tank, a strong evaporation device, a vacuum pump, a condenser, and a condensate water tank. The bottom of the concentrate storage tank is connected to the strong evaporation device through a pipeline. The strong evaporation device is an airtight cavity. The top is connected to the vacuum pump through a pipeline. The vacuum pump is connected to the condenser. The condenser outlet pipeline is connected to the condensate water tank. The strong evaporation device has a built-in inclined spiral stirring mechanism. A storage tank is arranged at the tail of the spiral stirring mechanism to temporarily store solid and / or semi-solid materials transported by the spiral stirring mechanism. A pressure gauge and a pressure relief valve are also arranged on the strong evaporation device.

[0007] The outside of the concentrated liquid storage tank is covered with insulation material, and the top cover is fixed on the top by bolts. A thermometer is also arranged on the concentrated liquid storage tank.

[0008] The bottom of the concentrate storage tank is conical.

[0009] An observation window and a thermometer are provided on the strong evaporation device.

[0010] The evaporation device is of jacketed structure, and hot steam or heating oil is introduced into the jacket.

[0011] Compared with the prior art, the utility model reduces the pressure in the strong evaporation device to negative pressure through a vacuum pump, thereby lowering the boiling point of the high-oil concentrate in the strong evaporation device, and utilizes an inclined spiral stirring mechanism to keep the evaporated concentrate in the strong evaporation device in a stirring state, thereby preventing the oil film on the surface of the concentrate from hindering the evaporation of water, and utilizes the waste heat of the high-temperature evaporated concentrate to evaporate it again under negative pressure, thereby effectively reducing the water content in the high-oil concentrate, reducing the additional disposal costs required for the evaporated concentrate, and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] In the figure: 1-concentrated liquid storage tank, 12-thermometer, 2-strong evaporation device, 21-discharge port, 22-rotating shaft, 23-stirring motor, 24-storage tank, 25-spiral stirring mechanism, 26-pressure gauge, 27-observation window, 28-pressure relief valve, 3-vacuum exhaust pump, 4-condenser, 43-condensate outlet, 44-non-condensable gas outlet, 5-condensate tank, 6-container, 7-valve. DETAILED DESCRIPTION

[0014] like Figure 1 As shown, a device for reducing the amount of high-oil evaporation concentrate includes a concentrate storage tank 1, a strong evaporation device 2, a vacuum pump 3, a condenser 4, and a condensate water tank 5. The bottom of the concentrate storage tank 1 is connected to the strong evaporation device 2 through a pipeline. The strong evaporation device 2 is an airtight cavity, and the top is connected to the vacuum pump 3 through a pipeline. The vacuum pump 3 is connected to the condenser 4, and the outlet pipeline of the condenser 4 is connected to the condensate water tank 5; the strong evaporation device 2 has a built-in inclined spiral stirring mechanism 25, and the tail of the spiral stirring mechanism 25 is provided with a storage tank 24 for collecting solid materials lifted by the spiral stirring mechanism 25 under low-speed rotation. The strong evaporation device 2 is also provided with a pressure gauge 26 and a pressure relief valve 28.

[0015] Furthermore, the concentrated liquid storage tank 1 is directly connected to the discharge port of the evaporation system through a pipeline. The evaporated concentrated liquid entering the concentrated liquid storage tank 1 is a liquid with a certain temperature. In order to prevent the temperature of the high-temperature liquid in the concentrated liquid storage tank 1 from being lost, the concentrated liquid storage tank 1 is coated with a heat-insulating material. In addition, a thermometer 12 is provided on the concentrated liquid storage tank 1 to monitor the temperature of the liquid in the concentrated liquid storage tank 1 in real time, so as to timely adjust the process conditions of the strong evaporation device 2, such as adjusting the negative pressure in the strong evaporation device 2 by a vacuum pump 3 or increasing the temperature of the liquid in the strong evaporation device 2 by adding a heat source. The top cover of the concentrated liquid storage tank 1 is fixed by bolts, which is convenient to open and manually clean the residue in the tank. The bottom of the concentrated liquid storage tank 1 is conical, which is convenient for all the liquid in the tank to flow out, and solves the problem that the liquid is easy to remain at right angles.

[0016] Furthermore, the strong evaporation device 2 is provided with a thermometer 12, an observation window 27, a pressure gauge 26 and a pressure relief valve 28. The state of the material in the strong evaporation device 2 can be seen through the observation window 27, which provides auxiliary information for workers to judge the progress of the strong evaporation process, and facilitates workers to make some process adjustments according to the observed situation in the strong evaporation device 2. The pressure gauge 26 and the thermometer 12 display the temperature and pressure of the concentrated liquid in the strong evaporation device 2 in real time, which facilitates workers to flexibly control the start and stop and power of the vacuum pump 3. The existence of the pressure relief valve 28 facilitates the adjustment of the pressure of the strong evaporation device 2 to keep the pressure in the device stable; after the strong evaporation process is completed, the material in the strong evaporation device 2 is released after the pressure is released through the pressure relief valve.

[0017] The spiral stirring mechanism 25 is driven by the motor 23 through the transmission shaft 22 . The spiral stirring mechanism 25 stirs the evaporated concentrate in the strong evaporation device 2 to prevent the oil film on the surface of the concentrate from hindering the evaporation of water, and transports the solid and semi-solid materials deposited at the bottom to the storage tank 24 .

[0018] The strong evaporation device 2 is a jacketed structure, and hot steam or heating oil is introduced into the jacket. Other heat sources such as high-temperature steam and heat-conducting oil are used to supplement the liquid in the strong evaporation device 2 with additional heat energy, and the evaporation concentrate is properly heated to improve the evaporation efficiency of the strong evaporation device.

[0019] The vacuum pump 3 is a high temperature resistant vacuum pump. The working temperature of the equipment is 30-90℃. Roots pump, water ring pump, sliding rotor pump, etc. can be selected. Taking the Roots pump as an example, the exhaust port of the vacuum pump 3 is connected to the inlet of the condenser 4 through a pipeline. The gas extracted by the vacuum pump 3 in the strong evaporation device 2 enters the condenser 4 for cooling and is converted into non-condensable gas and condensed water. The non-condensable gas discharged from the non-condensable gas outlet 44 can be introduced into a suitable tail gas treatment device and discharged after treatment; the condensed water flowing out of the condensed water outlet 43 enters the condensed water tank 5 and can be introduced into the biochemical system for terminal treatment.

[0020] The condenser 4 can flexibly select a plate heat exchanger, a shell and tube heat exchanger, a spiral plate heat exchanger and other devices.

[0021] A valve 7 is provided on the pipeline between the concentrated liquid storage tank 1 and the strong evaporation device, and the liquid is controlled to be on and off by the valve.

[0022] Working process: The high-temperature evaporation concentrate produced by the front-end evaporation system enters the concentrate storage tank 1, and then is transmitted to the strong evaporation device 2 through a pipeline. The evaporation concentrate entering the strong evaporation device 2 from the concentrate storage tank 1 generally has three components, liquid oil, liquid water, salt dissolved in water and suspended in water, and solids. Use a high-temperature resistant vacuum pump 3 to slowly pump negative pressure to it, thereby reducing the atmospheric pressure inside the strong evaporation device 2, lowering the boiling point of water and allowing the water to continue to evaporate, so as to reduce the water content in the material as much as possible; the inclined spiral stirring mechanism 25 in the strong evaporation device 2 rotates at a high speed to break the oil layer liquid seal, so that the evaporation concentrate is in a stirring state, avoiding the oil film on the surface of the concentrate hindering the evaporation of water, and increasing the evaporation of water vapor. The water vapor enters the condenser 4 with the negative pressure air for condensation, and the condensed water enters the condensation water tank 5. The non-condensable gas enters the exhaust gas treatment device after passing through the condenser outlet 44. As the evaporation process continues, the water content of the concentrated evaporation liquid in the strong evaporation device 2 decreases, salt is precipitated, and the solid content increases, changing from liquid to semi-solid and solid. The concentrated liquid condition in the strong evaporation device 2 can be judged through the observation window 27, and whether the expected processing conditions are met according to the actual situation of the material. After the strong evaporation treatment is completed, the pressure relief valve on the strong evaporation device 2 is opened to release the pressure, and the driving motor 23 of the spiral stirring mechanism 25 continues to rotate and reduce the speed. The spiral stirring mechanism 25 slowly takes the solid spiral out and transports it to the storage tank 24, and discharges it from the bottom of the storage tank 24. It is temporarily stored or transported through the container 6 and can be used as a material for the material pit; the remaining clearer oil and organic liquid are discharged through the left discharge port, and can be transferred to the waste liquid spray gun to be sprayed into the incineration system to reduce the liquid content in the material pit.

[0023] The container 6 can be selected from wide-mouth plastic barrels, iron barrels, large-mouth ton barrels and other containers according to actual production conditions.

[0024] The utility model reduces the pressure in the strong evaporation device to negative pressure by means of a vacuum pump, reduces the boiling point of the high-oil concentrate in the strong evaporation device, utilizes an inclined spiral stirring mechanism to keep the evaporated concentrate in the strong evaporation device in a stirring state, avoids the oil film on the surface of the concentrate hindering the evaporation of water, avoids the liquid sealing caused by the high-oil concentrate, utilizes the waste heat of the high-temperature evaporated concentrate to evaporate it again under negative pressure, effectively reduces the water content in the high-oil concentrate, reduces the additional disposal cost required for the evaporated concentrate, and improves efficiency.

[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that, for those skilled in the art, several changes and improvements can be made without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A device for reducing the amount of high oil evaporation concentrate, characterized in that: The invention comprises a concentrated liquid storage tank (1), a strong evaporation device (2), a vacuum pump (3), a condenser (4), and a condensate water tank (5). The bottom of the concentrated liquid storage tank (1) is connected to the strong evaporation device (2) via a pipeline. The strong evaporation device (2) is an airtight cavity. The top is connected to the vacuum pump (3) via a pipeline. The vacuum pump (3) is connected to the condenser (4). The liquid outlet pipeline of the condenser (4) is connected to the condensate water tank (5). The strong evaporation device (2) has a built-in inclined spiral stirring mechanism (25). A storage tank (24) is arranged at the tail of the spiral stirring mechanism (25) to temporarily store solid and / or semi-solid materials transported by the spiral stirring mechanism (25). A pressure gauge (26) and a pressure relief valve (28) are also arranged on the strong evaporation device (2).

2. The device for reducing the amount of high oil evaporation concentrate according to claim 1, characterized in that: The concentrated liquid storage tank (1) is coated with a heat-insulating material on the outside, and a top cover is fixed on the top by bolts. A thermometer (12) is also provided on the concentrated liquid storage tank (1).

3. The device for reducing the amount of high oil evaporation concentrate according to claim 1 or 2, characterized in that: The bottom of the concentrated liquid storage tank (1) is conical.

4. The device for reducing the amount of high oil evaporation concentrate according to claim 1 is characterized in that: An observation window (27) and a thermometer (12) are provided on the strong evaporation device (2).

5. The device for reducing the amount of high oil evaporation concentrate according to claim 1 is characterized by: The evaporation device (2) is a jacketed structure, and hot steam or heating oil is introduced into the jacket.

Images