Coal mine wastewater evaporation and concentration system based on saline water double-medium heat storage regulation and control

Abstract

The utility model relates to a coal mine wastewater evaporation and concentration system based on saline water double-medium heat storage regulation and control, which comprises a waste liquid pump, a first preheater, a second preheater, an evaporator, a centrifugal compressor, a gas-liquid separator, a circulating pump, a condensate water tank, a heat storage tank and an electric heater, two outlets of the first preheater are respectively connected with the second preheater and the condensate water tank; the second preheater is connected with the evaporator and is used for heating the waste liquid preheated by the first preheater by using non-condensable gas in the evaporator; the gas-liquid separator is connected with the evaporator; the centrifugal compressor is connected with a gas phase outlet of the gas-liquid separator and the evaporator; the circulating pump is connected with a liquid phase outlet of the gas-liquid separator and the evaporator; the heat storage tank is a saline-water double-medium heat storage tank; the electric heater is connected with the condensate water tank and the heat storage tank. Not only can the purification and resource utilization of the wastewater be realized, but also the wastewater treatment cost and the environmental burden of enterprises can be obviously reduced.

Description

Technical Field

[0001] The utility model belongs to the field of evaporation and crystallization, and in particular relates to a coal mine wastewater evaporation and concentration system based on brine dual-medium heat storage regulation. Background Art

[0002] The industrial electricity cost of the coal industry is relatively high, and wastewater treatment requires a continuous supply of steam, which requires a large amount of steam. The operating cost of coal plants that do not generate their own electricity is relatively high, so a system that saves energy and has low operating costs is needed to meet the demand. Utility Model Content

[0003] The technical problem to be solved by the utility model is: in order to solve the high electricity cost of the coal industry and the large demand for steam for wastewater treatment, the utility model provides a coal mine wastewater evaporation and concentration system based on brine dual-medium heat storage control.

[0004] The technical solution adopted by the utility model to solve the technical problem is as follows:

[0005] A coal mine wastewater evaporation and concentration system based on brine dual-medium heat storage control includes a waste liquid pump, a first preheater, a second preheater, an evaporator, a centrifugal compressor, a gas-liquid separator, a circulating pump, a condensing water tank, a heat storage tank and an electric heater.

[0006] The two inlets of the first preheater are respectively connected to the waste liquid pump and the evaporator, and the two outlets of the first preheater are respectively connected to the second preheater and the condensate water tank, so as to preheat the waste liquid by using the heat of the high-temperature liquid in the evaporator; the waste liquid pump is connected to the coal mine waste liquid pipeline;

[0007] The second preheater is connected to the evaporator and is used to heat the waste liquid preheated by the first preheater using the non-condensable gas in the evaporator;

[0008] The gas-liquid separator is connected to the evaporator and is used to perform gas-liquid separation on the gas-liquid mixture in the evaporator;

[0009] The centrifugal compressor is connected to the gas phase outlet of the gas-liquid separator on one hand, and to the evaporator on the other hand, and is used to convert the steam separated by the gas-liquid separator into high-temperature and high-pressure steam, which re-enters the evaporator for use;

[0010] The circulating pump is connected to the liquid phase outlet of the gas-liquid separator on one hand, and to the evaporator on the other hand, and is used to re-enter the solution separated by the gas-liquid separator into the evaporator for forced circulation evaporation;

[0011] The heat storage tank is a brine dual-medium heat storage tank, which is connected to the evaporator and is used to provide steam for the evaporator;

[0012] The electric heater is connected to the condensing water tank on one hand and to the heat storage tank on the other hand, and is used to convert the water in the condensing water tank into high-temperature and high-pressure steam to store heat in the heat storage tank.

[0013] Further, the evaporator 4 includes a liquid outlet 44, a gas outlet 46, a liquid inlet 45, a gas-liquid mixture outlet 41, a steam inlet 42 and a concentrated liquid discharge pipe 43;

[0014] Furthermore, the concentrated liquid discharge pipeline of the evaporator is connected to the pipeline between the gas-liquid separator and the circulation pump, and a concentrated liquid discharge control valve is arranged at the outlet of the concentrated liquid discharge pipeline.

[0015] Furthermore, the gas-liquid mixture outlet 41 is located at the upper part of the evaporator, the concentrated liquid discharge pipe 43 is arranged at the lower end of the evaporator, the gas outlet 46, the liquid inlet 45 and the liquid outlet 44 are arranged from top to bottom on one side of the evaporator, and the steam inlet 42 is arranged on the other side.

[0016] Furthermore, the heat storage tank has three kinds of pipes inside, namely, a steam collecting pipe, an annular pipe and a serpentine pipe. The steam collecting pipe is formed by a spirally wound pipe which is arranged in three layers, namely, upper, middle and lower layers and connected in sequence, and a spray hole is arranged on the pipe wall of the steam collecting pipe. The annular pipe is evenly surrounded on the three-layer steam collecting pipe, and the nozzles on the annular pipe and the pipe wall of the steam collecting pipe do not interfere with each other. The serpentine pipe is arranged on the plane of the central axis of the inner cavity of the heat storage tank, and the steam collecting pipe, the annular pipe and the serpentine pipe are independent of each other and do not interfere with each other. Steam is introduced into the steam collecting pipe, the inner cavities of the annular pipe and the serpentine pipe are filled with phase change salt, and the inner cavity of the heat storage tank is filled with water medium.

[0017] Furthermore, the electric heater is powered by wind power, photovoltaic power and / or off-peak power.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] The utility model combines salt water dual medium heat storage with wastewater evaporation and concentration. The salt water dual medium heat storage can efficiently utilize cheap energy such as wind power, off-peak electricity, photovoltaics, etc. to provide the system with steam required for wastewater evaporation, which can not only achieve wastewater purification and resource utilization, but also significantly reduce the enterprise's wastewater treatment costs and environmental burden. The process is simple, the operation is stable, the degree of automation is high, the energy consumption is low and the energy utilization efficiency is high, and it has important social and economic benefits. The technology can achieve the advantages of low energy consumption, good economic benefits, and obvious environmental protection effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the coal mine wastewater evaporation and concentration system based on brine dual-medium heat storage control of the utility model;

[0021] Figure 2 It is a structural schematic diagram of the evaporator in the utility model;

[0022] In the figure, 1. waste liquid pump, 2. first preheater, 3. second preheater, 4. evaporator, 5. gas-liquid separator, 6. centrifugal compressor, 7. circulating pump, 8. condensate tank, 9. heat storage tank, 10. electric heater, 11. concentrate discharge control valve, 12. waste liquid inlet, 13. steam regulating valve. DETAILED DESCRIPTION

[0023] The specific embodiments are given below in combination with the embodiments and drawings. The specific embodiments are only used to further illustrate the technical solution of the utility model in detail, and do not limit the protection scope of the present application.

[0024] Reference Figure 1 The utility model is a coal mine wastewater evaporation and concentration system based on brine dual-medium heat storage control, including a waste liquid pump 1, a first preheater 2, a second preheater 3, an evaporator 4, a gas-liquid separator 5, a centrifugal compressor 6, a circulating pump 7, a condensate tank 8, a heat storage tank 9, an electric heater 10, a concentrated liquid discharge control valve 11, a waste liquid inlet 12, and a steam regulating valve 13;

[0025] The evaporator 4 includes a liquid outlet 44, an air outlet 46, a liquid inlet 45, a gas-liquid mixture outlet 41, a steam inlet 42, and a concentrated liquid discharge pipe 43; the gas-liquid mixture outlet 41 is located at the upper part of the evaporator, and the concentrated liquid discharge pipe 43 is arranged at the lower end of the evaporator. The air outlet 46, the liquid inlet 45 and the liquid outlet 44 are arranged on one side of the evaporator from top to bottom, and the steam inlet 42 is arranged on the other side. The steam inlet 42 is arranged at a height on the evaporator between the liquid inlet 45 and the liquid outlet 44.

[0026] The hot water inlet of the first preheater 2 is connected to the liquid outlet 44 of the evaporator 4, the liquid inlet of the first preheater is connected to the waste liquid pump 1, the waste liquid inlet 12 of the waste liquid pump is connected to the waste liquid pipeline, the coolant outlet of the first preheater 2 is connected to the condensed water tank 8, the hot liquid outlet of the first preheater is connected to the liquid inlet of the second preheater 3, and the first preheater 2 is used to recover the heat of the distilled water in the evaporator 4; the gas inlet of the second preheater 3 is connected to the gas outlet 46 of the evaporator 4, the non-condensable gas in the steam extracted from the evaporator 4 is discharged from the gas outlet of the second preheater after heat exchange in the second preheater 3, and the liquid heated by the second preheater 3 is connected to the liquid inlet 45 of the evaporator 4 through the liquid outlet of the second preheater;

[0027] The gas-liquid separator 5 is connected to the gas-liquid mixture outlet 41 of the evaporator 4 to separate the solution and steam in the gas-liquid mixture;

[0028] The inlet of the centrifugal compressor 6 is connected to the gas phase outlet of the gas-liquid separator 5, and the outlet of the centrifugal compressor 6 is connected to the steam inlet 42 of the evaporator 4. The steam separated by the gas-liquid separator 5 is converted into high-temperature and high-pressure steam by the centrifugal compressor 6 and re-enters the evaporator 4 for use.

[0029] The liquid phase outlet of the gas-liquid separator 5 is connected to the liquid inlet 45 of the evaporator 4 via the circulation pump 7, and the solution separated by the gas-liquid separator 5 re-enters the evaporator 4 via the circulation pump 7 for forced circulation evaporation;

[0030] The outlet of the heat storage tank 9 is connected to the steam inlet 42 of the evaporator 4, and a steam regulating valve 13 is provided on the pipeline connecting the heat storage tank 9 and the evaporator to provide steam to the evaporator 4; the inlet of the electric heater 10 is connected to the outlet of the condensed water tank 8, and the outlet of the electric heater 10 is connected to the inlet of the heat storage tank 9;

[0031] A concentrated liquid discharge pipeline 43 is provided at the lower part of the evaporator 4, the concentrated liquid discharge pipeline is connected with the pipeline between the gas-liquid separator 5 and the circulation pump 7, and a concentrated liquid discharge control valve 11 is provided at the outlet of the concentrated liquid discharge pipeline.

[0032] Furthermore, there are three kinds of pipes inside the heat storage tank 9, namely, a steam collecting pipe 903, an annular pipe 902, and a serpentine pipe 901. The steam collecting pipe 903 is formed by a spirally wound pipe arranged in multiple layers and connected in sequence, and a spray hole is arranged on the pipe wall of the steam collecting pipe 903; the annular pipe 902 is evenly surrounded on the multi-layer steam collecting pipe 903 pipe, and the nozzles on the annular pipe 902 and the pipe wall of the steam collecting pipe 903 do not interfere with each other; the serpentine pipe 901 is arranged on the plane of the central axis of the inner cavity of the heat storage tank, and the three pipes of the steam collecting pipe 903, the annular pipe 902, and the serpentine pipe 901 are independent of each other and do not interfere with each other. Steam is introduced into the steam collecting pipe 903, the inner cavities of the annular pipe 902 and the serpentine pipe 901 are filled with phase change salt, and the inner cavity of the heat storage tank 9 is filled with water medium. The water medium does not fill the entire interior of the heat storage tank 9, and a certain space is reserved for placing a steam-water separator, which is connected to the steam outlet of the heat storage tank 9.

[0033] The working principle and working process of this system are as follows: factory wastewater enters the first preheater 2 through the waste liquid inlet 12 from the waste liquid pump 1, exchanges heat with the distilled water from the evaporator 4 in the first preheater 2, and the waste liquid after heat exchange enters the second preheater 3. The distilled water is cooled by heat exchange to become condensed water, and enters the condensed water tank 8 for storage. In the second preheater 3, it exchanges heat with the non-condensable steam in the steam of the evaporator 4 to further increase its heat. The non-condensable gas after heat exchange is discharged into the atmosphere, and the waste liquid enters the evaporator 4 for evaporation. Then the gas-liquid mixture enters the gas-liquid separator 5, and the solution and steam are separated to reach the standard concentrated liquid, which is directly discharged from the system through the concentrated liquid discharge control valve 11. The solution that does not reach the standard enters the evaporator 4 again through the circulation pump 7 for circulating evaporation and concentration, and the steam enters the centrifugal compressor 6 to become high-temperature and high-pressure steam, which is reused to enter the evaporator 4 for heat exchange and evaporation with the waste liquid.

[0034] The steam required for evaporation of the waste liquid in the evaporator 4 can be provided by the heat storage tank 9. The condensed water in the condensed water tank 8 enters the electric heater 10, becomes high-temperature and high-pressure steam, and is sent to the heat storage tank 9 through a pipeline. The steam enters the steam collecting pipe 903 connected to the inlet of the heat storage tank 9, and is sprayed through the nozzle on the steam collecting pipe 903 to exchange heat with the water medium in the inner cavity, thereby increasing the temperature of the water medium. The steam in the steam collecting pipe 903 transfers heat to the phase change salt in the surrounding tube 902 through the tube wall in the form of heat conduction and convection heat exchange, thereby increasing the temperature of the phase change salt. When the water medium in the inner cavity rises to a certain temperature, the water medium transfers heat to the phase change salt in the serpentine tube 901 through the tube wall in the form of convection heat exchange and heat conduction, thereby increasing the temperature of the phase change salt in the serpentine tube 901. In this way, the steam is continuously input. When the water medium in the inner cavity of the heat storage tank 9 rises to the set temperature, the steam input is stopped, and the heat storage is completed. When the system needs steam, the steam regulating valve 13 is opened, the water medium inside the heat storage tank 9 flashes, and the steam passes through the steam-water separator on the top of the heat storage tank and enters the evaporator 4 for use. The electric energy of the electric heater 10 is provided by cheap electricity such as wind power, off-peak electricity, and photovoltaic power. The salt water dual-medium heat storage tank can store cheap electricity to supply the steam required for wastewater evaporation.

[0035] Anything not described in the present invention is applicable to the prior art.

Claims

1. A coal mine wastewater evaporation and concentration system based on brine dual-medium heat storage control, comprising a waste liquid pump, a first preheater, a second preheater, an evaporator, a centrifugal compressor, a gas-liquid separator, a circulating pump, a condensate tank, a heat storage tank and an electric heater, characterized in that: The two inlets of the first preheater are respectively connected to the waste liquid pump and the evaporator, and the two outlets of the first preheater are respectively connected to the second preheater and the condensate water tank, so as to preheat the waste liquid by using the heat of the high-temperature liquid in the evaporator; the waste liquid pump is connected to the coal mine waste liquid pipeline; The second preheater is connected to the evaporator and is used to heat the waste liquid preheated by the first preheater using the non-condensable gas in the evaporator; The gas-liquid separator is connected to the evaporator and is used to perform gas-liquid separation on the gas-liquid mixture in the evaporator; The centrifugal compressor is connected to the gas phase outlet of the gas-liquid separator on one hand, and to the evaporator on the other hand, and is used to convert the steam separated by the gas-liquid separator into high-temperature and high-pressure steam, which re-enters the evaporator for use; The circulating pump is connected to the liquid phase outlet of the gas-liquid separator on one hand, and to the evaporator on the other hand, and is used to re-enter the solution separated by the gas-liquid separator into the evaporator for forced circulation evaporation; The heat storage tank is a brine dual-medium heat storage tank, which is connected to the evaporator and is used to provide steam for the evaporator; The electric heater is connected to the condensing water tank on one hand and to the heat storage tank on the other hand, and is used to convert the water in the condensing water tank into high-temperature and high-pressure steam to store heat in the heat storage tank.

2. The coal mine wastewater evaporation and concentration system based on brine dual-medium heat storage control according to claim 1 is characterized in that: The evaporator comprises a liquid outlet, a gas outlet, a liquid inlet, a gas-liquid mixture outlet, a steam inlet and a concentrated liquid discharge pipeline.

3. The coal mine wastewater evaporation and concentration system based on brine dual-medium heat storage control according to claim 2 is characterized in that: The concentrated liquid discharge pipeline of the evaporator is connected with the pipeline between the gas-liquid separator and the circulation pump, and a concentrated liquid discharge control valve is arranged at the outlet of the concentrated liquid discharge pipeline.

4. The coal mine wastewater evaporation and concentration system based on brine dual-medium heat storage control according to claim 2 is characterized in that: The gas-liquid mixture outlet is located at the upper part of the evaporator, the concentrated liquid discharge pipeline is arranged at the lower end of the evaporator, a gas outlet, a liquid inlet and a liquid outlet are arranged from top to bottom on one side of the evaporator, and a steam inlet is arranged on the other side.

5. The coal mine wastewater evaporation and concentration system based on brine dual-medium heat storage control according to claim 1 is characterized in that: There are three kinds of pipes inside the heat storage tank, namely, a steam collecting pipe, an annular pipe and a serpentine pipe. The steam collecting pipe is formed by spirally wound pipes arranged in three layers, namely, upper, middle and lower layers and connected in sequence, and spray holes are arranged on the pipe wall of the steam collecting pipe. The annular pipe is evenly surrounded on the three-layer steam collecting pipe, and the nozzles on the annular pipe and the pipe wall of the steam collecting pipe do not interfere with each other. The serpentine pipe is arranged on the plane of the central axis of the inner cavity of the heat storage tank, and the steam collecting pipe, the annular pipe and the serpentine pipe are independent of each other and do not interfere with each other. Steam is introduced into the steam collecting pipe, the inner cavities of the annular pipe and the serpentine pipe are filled with phase change salt, and the inner cavity of the heat storage tank is filled with water medium.

6. The coal mine wastewater evaporation and concentration system based on brine dual-medium heat storage control according to claim 1 is characterized in that: The electric heater is powered by wind power, photovoltaic power and / or off-peak power.

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