CN214936167U - Low-temperature negative-pressure evaporation concentration system applied to wastewater zero discharge device - Google Patents
Low-temperature negative-pressure evaporation concentration system applied to wastewater zero discharge device Download PDFInfo
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Abstract
The utility model relates to a low-temperature negative-pressure evaporative concentration system applied to a wastewater zero discharge device, a water inlet of a triple-effect evaporator is connected with wastewater, a water outlet of the triple-effect evaporator is connected with the top of a tube pass of the triple-effect heater and a water inlet end of a double-effect evaporator through a triple-effect circulating pump, a water outlet end of the double-effect evaporator is connected with the top of a tube pass of the double-effect heater and a water inlet end of a single-effect evaporator through a double-effect circulating pump, a water outlet end of the single-effect evaporator is connected with the top of a tube pass of the single-effect heater through a single-effect circulating pump, a steam inlet end of the single-effect heater is connected with a temperature and pressure reducing device, the tube pass of the single-effect heater is provided with a first gas outlet which is connected with a condensate water storage tank, the tube pass of the double-effect heater, the tube pass of the triple-effect heater, the condenser is provided with a second gas outlet which is connected with a condensate water tank, condensate water of the double-effect steam condensate water tank is pumped to the condensate water storage tank through the double-steam pump, the condensed water storage tank is connected with the clear water tank through a condensed water delivery pump.
Description
Technical Field
The utility model relates to an evaporative concentration system technical field especially relates to a be applied to waste water zero discharge apparatus's low temperature negative pressure evaporative concentration system.
Background
The concentration and decrement of the wastewater refers to that partial water is separated by adopting a technical means, and the wastewater with higher concentration and salt content but reduced total amount is left. The purpose of the concentration decrement is to reduce the amount of wastewater entering the subsequent end-cure treatment system to reduce the overall investment and operating costs of the wastewater treatment system. The existing concentration and decrement process can be divided into two categories, namely a membrane method and a thermal method.
The conventional membrane concentration technology can concentrate the solution by 3-5 times (in terms of salt content), and the coupling electrodialysis technology can realize about 8 times of concentration. Most membrane treatments have high requirements on the ion content in raw water and the physical indexes of the raw water, and improper treatment of the raw water easily causes membrane pore blockage and membrane surface scaling, so that the desalination rate and the water yield are reduced, and even membrane modules are scrapped.
SUMMERY OF THE UTILITY MODEL
For overcoming the problem that exists among the prior art, the utility model provides a be applied to waste water zero discharge device's low temperature negative pressure evaporation concentration system optimizes waste water treatment system, and it is integrated with multiple-effect evaporation technique and seed crystal method technical combination to optimize the improvement on its basis, fine solution waste water is difficult to handle, produces the difficult retrieval and utilization scheduling problem of calcium magnesium scale deposit, former waste water in the waste water evaporation process.
The utility model provides a be applied to waste water zero discharge device's low temperature negative pressure evaporative concentration system, includes triple effect evaporimeter 7, triple effect evaporimeter is provided with the water inlet, is connected with waste water, triple effect evaporimeter's delivery port is connected with the intake end of triple effect heater tube side 6 top and double effect evaporimeter 5 through triple effect circulating pump 11, double effect evaporimeter 5 is provided with out the water end, the play water end of double effect evaporimeter 5 is connected with the intake end of double effect heater tube side 4 top and single effect evaporimeter 3 through double effect circulating pump 10, single effect evaporimeter 3 is provided with out the water end, the play water end of single effect evaporimeter 3 is connected with single effect heater tube side 2 top through single effect circulating pump 9, single effect heater tube side 2 is provided with the steam inlet end, the steam inlet end is connected with temperature and pressure reduction device 1, and dormitory temperature and pressure reduction device sets up in the steam inlet end outside, the utility model discloses a steam condensing water heater, including a first effect heater tube side 2, a second effect heater tube side 4, triple effect heater tube side 6, condenser 8, a condensate tank 12, a condensate tank 13, a condensate tank 12, a condensate pump 17, a condensate pump 13, a condensate tank 12, a second gas outlet, a condensate tank 16, a secondary steam condensate in the secondary steam condensate tank 16, a condensate tank is provided with the delivery port and is connected with the clear water tank through the condensate pump. The specific working method comprises the following steps: first, wastewater is transported into a triple effect evaporator, establishing a liquid level. And starting the three-effect circulating pump to convey the wastewater to the top of the tube pass of the three-effect heater, and conveying part of the wastewater into the two-effect evaporator to establish a liquid level. And starting the two-effect circulating pump to convey the wastewater to the top of the tube pass of the two-effect heater, and conveying part of the wastewater to the first-effect evaporator to establish a liquid level. And starting the one-effect circulating pump to convey the wastewater to the top of the tube pass of the one-effect heater. Introducing steam into the temperature and pressure reducing device from the original machine set, properly reducing the pressure by the temperature and pressure reducing device, and outputting the steam to the tube pass of the one-effect heater to heat the wastewater. Wherein, the waste water is in a falling film state downwards along the tube pass downstream in the tube pass of the heater, becomes superheated liquid after being heated by the heater, is collected at the bottom of the heater and is discharged into the evaporator.
In a preferred embodiment of the present invention, the top of the secondary steam condensate water tank 16 and the side of the condenser 8 are connected to a vacuum pump 18, so as to pump the secondary steam condensate water tank 16 and the condenser 8 to a negative pressure state.
In a preferred embodiment of the present invention, the flow direction of the waste water in the first effective heater, the second effective heater and the third effective heater is from top to bottom, and the waste water in the first effective heater tube pass, the second effective heater tube pass and the third effective heater tube pass flows in the same direction.
In a preferred embodiment of the present invention, the first effective heater, the second effective heater, the third effective heater and the condenser are of a shell-and-tube heat exchanger structure, the material of the first effective heater, the second effective heater, the third effective heater and the condenser is one or a combination of several of carbon steel, stainless steel, aluminum alloy, copper alloy, titanium alloy and hastelloy alloy, the first effective heater, the second effective heater, the third effective heater and the condenser tube pass are smooth seamless tubes, the outer diameter range is 10-57mm, and the wall thickness is 0.5-4 mm.
In a preferred embodiment of the present invention, the condensed water storage tank and the secondary steam condensed water tank are steel vertical storage tank structures.
In a preferred embodiment of the present invention, the desulfurization wastewater in the first-effect evaporator is subjected to flash evaporation, concentrated into concentrated water, and then is partially conveyed to the first-effect heater tube pass through the first-effect circulating pump, and is subjected to forced circulation and repeated heating, and partially conveyed to the subsequent concentrated water clarification equipment, and the first-effect circulating pump is connected to the first-effect heater tube pass and the subsequent concentrated water clarification equipment; after flash evaporation, the wastewater in the double-effect evaporator is concentrated into concentrated water, one part of the concentrated water is conveyed to a tube pass of a double-effect heater through a double-effect circulating pump, forced circulation and repeated heating are carried out, and one part of the concentrated water is conveyed to the single-effect evaporator; and after flash evaporation, the wastewater in the triple-effect evaporator is concentrated into concentrated water, one part of the concentrated water is conveyed to a tube pass of the triple-effect heater through a triple-effect circulating pump, forced circulation and repeated heating are carried out, and the other part of the concentrated water is conveyed to the double-effect evaporator.
In a preferred embodiment of the present invention, the vacuum pump pumps the secondary steam condensate water tank and the condenser shell side to a negative pressure state, wherein the negative pressure is-98.5-0 kPa.
In a preferred embodiment of the utility model, the steam entering the tube pass of the one-effect heater through the temperature and pressure reducing device is low-pressure saturated steam with the pressure of 50-300kPa and the temperature of 75-130 ℃.
Compared with the prior art, the beneficial effects of the utility model are that:
1. the utility model utilizes a small amount of low-pressure steam as a heat source, and combines a seed crystal method with a multi-effect evaporation system, thereby achieving the purpose of waste water decrement concentration and simultaneously solving the problem of calcium and magnesium structure generated in the waste water evaporation process;
2. the utility model utilizes a small amount of steam, the required energy consumption is low, compared with a membrane concentration method, the membrane concentration method does not need chemical agent addition for softening treatment, the equipment operating pressure is approximately in a normal pressure state, and therefore, the operating cost is lower;
3. the utility model discloses the secondary steam that produces can regard as next effect heater heat source, has reached heat make full use of, and this method is more energy-conserving.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Example 1:
as shown in figure 1, a low-temperature negative-pressure evaporative concentration system applied to a wastewater zero discharge device comprises a triple-effect evaporator 7, wherein the triple-effect evaporator is provided with a water inlet and is connected with wastewater, a water outlet of the triple-effect evaporator is connected with the top of a triple-effect heater tube pass 6 and the water inlet end of a double-effect evaporator 5 through a triple-effect circulating pump 11, the double-effect evaporator 5 is provided with a water outlet end, the water outlet end of the double-effect evaporator 5 is connected with the top of a double-effect heater tube pass 4 and the water inlet end of a single-effect evaporator 3 through a double-effect circulating pump 10, the single-effect evaporator 3 is provided with a water outlet end, the water outlet end of the single-effect evaporator 3 is connected with the top of a single-effect heater tube pass 2 through a single-effect circulating pump 9, the single-effect heater tube pass 2 is provided with a steam inlet end, and the steam inlet end is connected with a temperature and pressure reducing device 1, dormitory temperature and pressure reduction device sets up in the steam inlet end outside, one imitates heater tube side 2 and is provided with first gas outlet and is connected with condensate water holding vessel 12, two imitate heater tube side 4, triple effect heater tube side 6, condenser 8 all are provided with the second gas outlet, the second gas outlet is connected with secondary steam condensate water pitcher 16, the secondary steam condensate water in secondary steam condensate water pitcher 16 passes through secondary steam condensate water pump 17 and carries to condensate water holding vessel 12, the condensate water holding vessel is provided with the delivery port and is connected with the clean water tank through condensate water delivery pump 13. The specific working method comprises the following steps: first, wastewater is transported into a triple effect evaporator, establishing a liquid level. And starting the three-effect circulating pump to convey the wastewater to the top of the tube pass of the three-effect heater, and conveying part of the wastewater into the two-effect evaporator to establish a liquid level. And starting the two-effect circulating pump to convey the wastewater to the top of the tube pass of the two-effect heater, and conveying part of the wastewater to the first-effect evaporator to establish a liquid level. And starting the one-effect circulating pump to convey the wastewater to the top of the tube pass of the one-effect heater. Introducing steam into the temperature and pressure reducing device from the original machine set, properly reducing the pressure by the temperature and pressure reducing device, and outputting the steam to the tube pass of the one-effect heater to heat the wastewater. Wherein, the waste water is in a falling film state downwards along the tube pass downstream in the tube pass of the heater, becomes superheated liquid after being heated by the heater, is collected at the bottom of the heater and is discharged into the evaporator. The falling film is concentrated water at the top of the first-effect heater, the second-effect heater and the third-effect heater, and is distributed by the liquid distributor in the heaters to form uniform liquid film-shaped downward flow in the whole heater tube pass. The first-effect evaporator, the second-effect evaporator and the third-effect evaporator are of steel horizontal storage tank structures.
In a preferred embodiment of the present invention, the top of the secondary steam condensate water tank 16 and the side of the condenser 8 are connected to a vacuum pump 18, so as to pump the secondary steam condensate water tank 16 and the condenser 8 to a negative pressure state.
In a preferred embodiment of the present invention, the flow direction of the waste water in the first effective heater, the second effective heater and the third effective heater is from top to bottom, and the waste water in the first effective heater tube pass, the second effective heater tube pass and the third effective heater tube pass flows in the same direction.
In a preferred embodiment of the present invention, the first effective heater, the second effective heater, the third effective heater and the condenser are of a shell-and-tube heat exchanger structure, the material of the first effective heater, the second effective heater, the third effective heater and the condenser is one or a combination of several of carbon steel, stainless steel, aluminum alloy, copper alloy, titanium alloy and hastelloy alloy, the first effective heater, the second effective heater, the third effective heater and the condenser tube pass are smooth seamless tubes, the outer diameter range is 10-57mm, and the wall thickness is 0.5-4 mm.
In a preferred embodiment of the present invention, the condensed water storage tank and the secondary steam condensed water tank are steel vertical storage tank structures.
In a preferred embodiment of the present invention, the desulfurization wastewater in the first-effect evaporator is subjected to flash evaporation, concentrated into concentrated water, and then is partially conveyed to the first-effect heater tube pass through the first-effect circulating pump, and is subjected to forced circulation and repeated heating, and partially conveyed to the subsequent concentrated water clarification equipment, and the first-effect circulating pump is connected to the first-effect heater tube pass and the subsequent concentrated water clarification equipment; after flash evaporation, the wastewater in the double-effect evaporator is concentrated into concentrated water, one part of the concentrated water is conveyed to a tube pass of a double-effect heater through a double-effect circulating pump, forced circulation and repeated heating are carried out, and one part of the concentrated water is conveyed to the single-effect evaporator; and after flash evaporation, the wastewater in the triple-effect evaporator is concentrated into concentrated water, one part of the concentrated water is conveyed to a tube pass of the triple-effect heater through a triple-effect circulating pump, forced circulation and repeated heating are carried out, and the other part of the concentrated water is conveyed to the double-effect evaporator.
In a preferred embodiment of the present invention, the vacuum pump pumps the secondary steam condensate water tank and the condenser shell side to a negative pressure state, wherein the negative pressure is-98.5-0 kPa.
In a preferred embodiment of the utility model, the steam entering the tube pass of the one-effect heater through the temperature and pressure reducing device is low-pressure saturated steam with the pressure of 50-300kPa and the temperature of 75-130 ℃.
In a preferred embodiment of the present invention, the superheated liquid in the first-effect evaporator is flashed, and the generated first-effect secondary steam enters the second-effect heater tube pass to heat the wastewater as the heat source of the second-effect heater. The superheated liquid in the second-effect evaporator is subjected to flash evaporation, and the generated second-effect secondary steam enters the shell pass of the three-effect heater to be used as a heat source of the three-effect heater to heat the wastewater. The superheated liquid in the triple-effect evaporator is subjected to flash evaporation, and the generated triple-effect secondary steam enters the shell pass of the condenser; 15 bottom pond internal recycle cooling water of cooling tower carries to the condenser tube side through cooling water pump 14, and to shell side's an effect steam heat transfer, cooling, tube side export recirculated cooling water is retrieved and is collected to cooling tower bottom pond in, cools off through the cooling tower, recycles then. The working temperature range of the circulating cooling water is as follows: 4-45 ℃.
In a preferred embodiment of the utility model, the primary effect secondary steam is medium in a pipeline connecting an outlet of the primary effect evaporator and an inlet at the top of a shell side of the secondary effect heater, and the pressure of the primary effect secondary steam is low-pressure saturated steam with the pressure of 15-120kPa and the temperature of 50-120 ℃. The secondary steam is medium in a pipeline connecting an outlet of the secondary evaporator and an inlet at the top of the shell pass of the triple-effect heater, and the pressure of the secondary steam is 10-100kPa, and the temperature of the secondary steam is 45-100 ℃. The triple-effect secondary steam is medium in a pipeline connecting an outlet of the triple-effect evaporator and an inlet at the top of a shell pass of the condenser, and the pressure of the triple-effect secondary steam is 7.5-70kPa, and the temperature of the triple-effect secondary steam is 40-90 ℃.
A low-temperature negative-pressure evaporation concentration system applied to a wastewater zero-discharge device is characterized in that a flushing water opening is reserved in the whole system, and industrial water is used as flushing water. The wastewater treatment system is optimized, the multi-effect evaporation technology and the seed crystal method technology are combined and integrated, and optimization and improvement are carried out on the basis of the multi-effect evaporation technology, so that the problems that the wastewater is difficult to treat, calcium and magnesium scaling is generated in the wastewater evaporation process, the original wastewater is difficult to recycle and the like are well solved. The calcium and magnesium scale formation prevention method is an optimized seed crystal method: the method comprises seed crystal addition and seed crystal circulation. The seed crystal addition is as follows: the seed crystal is only added when the system starts to operate, and the seed crystal is not added after the system normally operates. The seed crystal circulation is as follows: after the concentrated water at the outlet of the one-effect circulating pump is clarified subsequently, the separated slurry containing calcium and magnesium crystal salt returns to the system again to become supersaturated solution of calcium and magnesium salt, thereby achieving the purpose of preventing scaling. Calcium magnesium salts are those including but not limited to: calcium sulfate, calcium chloride, magnesium sulfate, magnesium chloride, and the like.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. But that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention, which is to be limited only by the claims appended hereto.
Claims (8)
1. The utility model provides a be applied to waste water zero discharge apparatus's low temperature negative pressure evaporation concentration system which characterized in that: including triple effect evaporimeter (7), triple effect evaporimeter is provided with the water inlet, is connected with waste water, triple effect evaporimeter's delivery port is connected with the end of intaking at triple effect heater tube side (6) top and double effect evaporimeter (5) through triple effect circulating pump (11), double effect evaporimeter (5) are provided with out the water end, the play water end of double effect evaporimeter (5) is connected with the end of intaking at double effect heater tube side (4) top and single effect evaporimeter (3) through double effect circulating pump (10), single effect evaporimeter (3) are provided with out the water end, the play water end of single effect evaporimeter (3) is connected with single effect heater tube side (2) top through single effect circulating pump (9), single effect heater tube side (2) are provided with the steam inlet end, the steam inlet end is connected with temperature and pressure reduction devices (1), and dormitory temperature and pressure reduction devices sets up in the steam inlet end outside, one imitate heater tube side (2) and be provided with first gas outlet and be connected with condensate water holding tank (12), two imitate heater tube side (4), triple effect heater tube side (6), condenser (8) all are provided with the second gas outlet, the second gas outlet is connected with secondary steam condensate water pitcher (16), the secondary steam condensate water in secondary steam condensate water pitcher (16) is carried to condensate water holding tank (12) through secondary steam condensate water pump (17), the condensate water holding tank is provided with the delivery port and is connected with the clear water tank through condensate water delivery pump (13).
2. The low-temperature negative-pressure evaporation and concentration system applied to the wastewater zero discharge device according to claim 1, characterized in that: the top of the secondary steam condensate water tank (16) and the side of the condenser (8) are connected with a vacuum pump (18), and the secondary steam condensate water tank (16) and the condenser (8) are pumped to a negative pressure state.
3. The low-temperature negative-pressure evaporation and concentration system applied to the wastewater zero discharge device according to claim 1, characterized in that: the flow direction of the wastewater in the first-effect heater, the second-effect heater and the third-effect heater is from top to bottom, and the wastewater in the tube pass of the first-effect heater, the tube pass of the second-effect heater and the tube pass of the third-effect heater flows in the same direction.
4. The low-temperature negative-pressure evaporation and concentration system applied to the wastewater zero discharge device according to claim 1, characterized in that: the first-effect heater, the second-effect heater, the third-effect heater and the condenser are in a shell-and-tube heat exchanger structure, the materials of the first-effect heater, the second-effect heater, the third-effect heater and the condenser are one or a combination of a plurality of carbon steel, stainless steel, aluminum alloy, copper alloy, titanium alloy and Hastelloy alloy, tube passes of the first-effect heater, the second-effect heater, the third-effect heater and the condenser are smooth seamless tubes, the outer diameter range of the first-effect heater, the outer diameter range of the second-effect heater, the outer diameter range of the third-effect heater and the wall thickness range of the third-effect heater are 10-57mm, and the wall thickness of the third-effect heater is 0.5-4 mm.
5. The low-temperature negative-pressure evaporation and concentration system applied to the wastewater zero discharge device according to claim 1, characterized in that: the condensed water storage tank and the secondary steam condensed water tank are of steel vertical storage tank structures.
6. The low-temperature negative-pressure evaporation and concentration system applied to the wastewater zero discharge device according to claim 1, characterized in that: the desulfurization wastewater in the first-effect evaporator is subjected to flash evaporation and then is concentrated into concentrated water, one part of the concentrated water is conveyed to a first-effect heater tube pass through a first-effect circulating pump, forced circulation and repeated heating are carried out, one part of the concentrated water is conveyed to subsequent concentrated water clarification equipment, and the first-effect circulating pump is connected with the first-effect heater tube pass and the subsequent concentrated water clarification equipment; after flash evaporation, the wastewater in the double-effect evaporator is concentrated into concentrated water, one part of the concentrated water is conveyed to a tube pass of a double-effect heater through a double-effect circulating pump, forced circulation and repeated heating are carried out, and one part of the concentrated water is conveyed to the single-effect evaporator; and after flash evaporation, the wastewater in the triple-effect evaporator is concentrated into concentrated water, one part of the concentrated water is conveyed to a tube pass of the triple-effect heater through a triple-effect circulating pump, forced circulation and repeated heating are carried out, and the other part of the concentrated water is conveyed to the double-effect evaporator.
7. The low-temperature negative-pressure evaporation and concentration system applied to the wastewater zero discharge device according to claim 2, characterized in that: the vacuum pump pumps the secondary steam condensate water tank and the condenser shell side to a negative pressure state, and the negative pressure is-98.5-0 kPa.
8. The low-temperature negative-pressure evaporation and concentration system applied to the wastewater zero discharge device according to claim 1, characterized in that: the steam enters the tube pass of the primary heater through the temperature and pressure reducing device, and the steam at the steam inlet end is low-pressure saturated steam with the pressure of 50-300kPa and the temperature of 75-130 ℃.
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| CN202022418080.6U CN214936167U (en) | 2020-10-27 | 2020-10-27 | Low-temperature negative-pressure evaporation concentration system applied to wastewater zero discharge device |
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| CN202022418080.6U CN214936167U (en) | 2020-10-27 | 2020-10-27 | Low-temperature negative-pressure evaporation concentration system applied to wastewater zero discharge device |
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