CN219546716U - Hot water tank exhaust steam utilization system in alumina production - Google Patents

Abstract

The utility model discloses a hot water tank exhaust steam utilization system in alumina production, which comprises a dilution tank, wherein a washing water heater is arranged at the top of the dilution tank, a water inlet of the washing water heater is communicated with a new water pipe, a steam inlet of the washing water heater is communicated with a first exhaust steam pipe on the dilution tank, a hot water outlet of the washing water heater is communicated with the hot water tank, the system also comprises a heat exchanger and a cleaning device, a heat medium inlet of the heat exchanger is communicated with an exhaust steam outlet at the top of the hot water tank through a second exhaust steam pipe, a cold medium inlet of the heat exchanger is communicated with a seed precipitation mother liquor pipe, a cold medium outlet of the heat exchanger is communicated to an evaporation raw liquor tank through an evaporation raw liquor pipe, and the cleaning device is communicated with the heat exchanger. According to the utility model, the heat exchanger and the cleaning device are arranged, and the exhaust steam of the hot water tank is introduced into the heat exchanger to be preheated and heated with seed precipitation mother liquor, so that the waste of energy caused by exhaust steam discharged into the atmosphere is effectively avoided; and wash the heat exchanger through belt cleaning device, avoid the inside pipeline scale deposit jam of heat exchanger, improve heat exchange efficiency.

Description

Hot water tank exhaust steam utilization system in alumina production

Technical Field

The utility model relates to the technical field of nonferrous metallurgy, in particular to a hot water tank exhaust steam utilization system in alumina production.

Background

In the high-pressure digestion process of an alumina factory, after digestion slurry enters a dilution tank, waste steam generated by self-evaporation of the slurry after re-expansion and pressure release in the dilution tank is used for spraying, heating and recovering new water to form hot water and is sent to a hot water tank for storage for cleaning red mud, but because the temperature of washing water used for cleaning the red mud in the hot water tank needs to be higher than 90 ℃, the generated low-pressure waste steam is usually directly discharged to the external atmosphere, so that a lot of heat is taken away, alkali is contained in the waste steam, hidden danger exists for personal safety and equipment corrosion, pollution is caused to the environment, and water resource waste is caused; meanwhile, the phenomenon that the waste steam is still excessive and is exhausted after the waste steam of the dilution tank is used for heating the washing water, and the reasons of low heat exchange efficiency and the like caused by scaling of the heat exchanger are utilized, so that the waste steam is not well utilized, and the recovery rate of the waste steam is low.

Chinese patent CN101049951B discloses a process and apparatus for utilizing waste steam, in particular to a process and apparatus for utilizing waste steam in the process of pressure boiling and digestion in alumina production system. It is composed of the following structures: the water outlet ends of the dilution tank and the final stage condensation water tank are connected with a washing water heater, the water outlet pipe of the evaporation sewer or new water conveying pipeline is connected with the washing water heater, and the hot water outlet pipe of the washing water heater is connected with the hot water tank. The utility model only recycles the waste steam generated in the dilution tank and the final-stage condensate tank to heat the washing water for washing the red mud and then store the washing water in the hot water tank, but the waste steam generated in the hot water tank is not well utilized, and the problem of low heat exchange efficiency caused by scaling of the heat exchanger cannot be solved.

The foregoing background is only for the purpose of facilitating an understanding of the principles and concepts of the utility model and is not necessarily in the prior art to the present application and is not intended to be used as an admission that such background is not entitled to antedate such novelty and creativity by virtue of prior utility model or that it is already disclosed at the date of filing of this application.

Disclosure of Invention

The utility model mainly aims to overcome the defects of the background technology and provide a hot water tank exhaust steam utilization system in alumina production.

In order to achieve the purpose, the hot water tank exhaust steam utilization system in alumina production comprises a dilution tank, wherein a washing water heater is arranged at the top of the dilution tank, a water inlet of the washing water heater is communicated with a new water pipe, a steam inlet of the washing water heater is communicated with a first exhaust steam pipe communicated with an exhaust steam outlet at the top of the dilution tank, a hot water outlet of the washing water heater is communicated with the hot water tank through a hot water pipe, the system further comprises a heat exchanger and a cleaning device, a heat medium inlet of the heat exchanger is communicated with an exhaust steam outlet at the top of the hot water tank through a second exhaust steam pipe, a heat medium outlet of the heat exchanger is communicated with the hot water tank through a condensed water recovery pipe, a cold medium inlet of the heat exchanger is communicated with one end of a seed precipitation mother liquor pipe, a cold medium outlet of the heat exchanger is communicated to an evaporation raw liquor tank through an evaporation raw liquor pipe, and the cleaning device is communicated with the heat exchanger. The exhaust steam in the hot water tank enters the heat exchanger through the second exhaust steam pipe to be preheated and heated by heat exchange with seed precipitation mother liquor in the heat exchanger, so that the exhaust steam generated in the hot water tank is fully utilized, pollution and harm to human bodies, equipment and environment caused by exhaust steam discharged into the atmosphere are effectively avoided, and energy is saved; moreover, the cleaning device can clean the scale of the heat exchanger, so that the heat exchange efficiency is prevented from being influenced after the scale of the heat exchanger is formed, and the utilization rate of exhaust steam is improved.

Further, the cleaning device comprises a concentrated acid storage tank, a cleaning buffer tank, a cleaning pump and a self-priming pump, wherein the concentrated acid storage tank is communicated with the cleaning buffer tank through an acid adding pipe, the cleaning buffer tank is respectively communicated with a cold medium inlet of the heat exchanger and a heat medium inlet of the heat exchanger through a cleaning liquid outlet pipe, the cleaning pump is communicated with the cleaning liquid outlet pipe, the cleaning buffer tank is respectively communicated with a cold medium outlet of the heat exchanger and a heat medium outlet of the heat exchanger through a cleaning circulating pipe, the self-priming pump is communicated with the cleaning circulating pipe, and the hot water tank is communicated with the cleaning buffer tank through a water supplementing pipe. Concentrated sulfuric acid for cleaning the heat exchanger is stored in a concentrated acid storage tank, and is pumped into a cleaning buffer tank to be subjected to concentration adjustment with hot water from the hot water tank during cleaning, so that the concentration is between 8 and 10 percent, and then the concentrated sulfuric acid is pumped into the heat exchanger through a cleaning pump and a cleaning liquid outlet pipe to be subjected to circulating pickling, scale in the heat exchanger is removed, and a pipeline of a cooling medium and a pipeline of a heating medium in the heat exchanger can be cleaned, so that the heat exchange efficiency of the heat exchanger is improved.

Further, the acid adding pipe is communicated with an acid adding metering pump, and the water supplementing pipe is communicated with a water supplementing pump and a first flowmeter. The acid adding metering pump can accurately meter the acid adding amount, and the water supplementing pump and the first flowmeter are used for metering the water adding amount, so that the acid washing concentration is ensured.

Further, the cleaning device further comprises a corrosion inhibitor storage tank, the corrosion inhibitor storage tank is communicated with the cleaning buffer tank through a corrosion inhibitor adding pipe, and a corrosion inhibitor metering pump is communicated with the corrosion inhibitor adding pipe. The corrosion of the heat exchanger pipeline can be prevented and slowed down by heating the corrosion inhibitor, and the service life of the equipment is prolonged.

Further, a stirring mechanism is arranged on the cleaning buffer groove. The cleaning solution is uniformly stirred by the stirring mechanism, so that the cleaning efficiency is improved.

Further, the top of the hot water tank is provided with a steam-water separator, the inlet of the steam-water separator is communicated with the exhaust steam outlet of the top of the hot water tank, the vapor phase outlet of the steam-water separator is communicated with the heat medium inlet of the heat exchanger through the second exhaust steam pipe, and the liquid phase outlet of the steam-water separator is communicated with the hot water tank. And (3) carrying out steam-water separation on the exhaust steam from the hot water tank through the steam-water separator, returning condensed water back into the hot water tank, and delivering the steam exhaust steam to the heat exchanger.

Further, a steam dividing pipe is communicated with the first exhaust steam pipe, and the steam dividing pipe is communicated with a heat medium inlet of the heat exchanger. The steam dividing pipe is used for carrying out heat exchange with seed separating mother liquor in the heat exchanger to preheat and heat the excessive exhaust steam of the dilution tank and the exhaust steam of the hot water tank at the same time, so that the exhaust steam is prevented from being discharged outwards, and the exhaust steam utilization rate is improved.

Further, a second flowmeter is arranged on the seed precipitation mother liquor pipe, the seed precipitation mother liquor pipe is communicated with the semen cooling plate type heat exchanger, and an evaporation raw liquor pump is arranged on the evaporation raw liquor pipe.

Further, the heat exchanger comprises a tank body and a heat exchange coil pipe arranged in the tank body, the seed precipitation mother liquor pipe is communicated with an inlet of the heat exchange coil pipe, the evaporation raw liquor pipe is communicated with an outlet of the heat exchange coil pipe, the second exhaust steam pipe is communicated with an inlet of the tank body, and the condensed water recovery pipe is communicated with an outlet of the tank body. The seed precipitation mother liquor from the semen cooling plate type heat exchanger enters the tube side of the heat exchanger, and the seed precipitation mother liquor after heat exchange is sent to an evaporation raw liquor tank through an evaporation raw liquor tube; and the exhaust steam enters the shell side of the heat exchanger, and condensed water generated after heat exchange returns to the hot water tank through the condensed water recovery pipe.

Further, a safety valve is arranged at the top of the tank body. The safety valve can ensure that the heat exchanger can safely operate, and safety is improved.

The beneficial effects of the utility model include: through the arrangement of the heat exchanger, the exhaust steam generated in the hot water tank is introduced into the heat exchanger through the second exhaust steam pipe to preheat and heat with seed precipitation mother liquor, so that the exhaust steam generated in the hot water tank is fully utilized, pollution and harm to human bodies, equipment and environment caused by exhaust steam discharged into the atmosphere are effectively avoided, and energy is saved; the heat exchanger is circularly cleaned by arranging the cleaning device, so that scaling and blockage in the heat exchanger are avoided, the problem of low heat exchange efficiency is solved, and the recovery utilization rate of exhaust steam is improved; through the matched use of the concentrated acid storage tank, the cleaning buffer tank, the cleaning pump and the self-priming pump, the heat exchanger is circularly cleaned by dilute sulfuric acid with the concentration of 8-10%, so that the cleaning efficiency of the heat exchanger is improved, and the heat exchange efficiency of the heat exchanger is further improved; excess exhaust steam of the dilution tank is introduced into the heat exchanger through the steam dividing pipe to preheat and heat with seed precipitation mother liquor, so that the utilization rate of the exhaust steam is further improved.

Drawings

FIG. 1 is an overall schematic diagram of a hot water tank exhaust steam utilization system in an embodiment of the utility model.

Fig. 2 is a schematic view of a cleaning apparatus according to an embodiment of the present utility model.

Reference numerals:

1 a dilution tank; 101 a first exhaust steam pipe; 1011 a first discharge pipe; 1012 a first discharge valve; 1013 branch steam valve; 1014 steam-dividing pipe; 2 a washing water heater; 201 a hot water pipe; 2011 hot water valve; 3, a new water pipe; 301 a water feeding pump; 302 a water flow meter; 303 water feed valve; 4 a hot water tank; 401 a second exhaust steam pipe; 4011 a second exhaust valve; 4012 a second drain; 4013 a second bleed valve; 402 a temperature sensor; 5 a heat exchanger; 501 a condensate recovery pipe; 5011 a condensate recovery pump; 5012 a condensate recovery valve; 502 a tank body; 503 a safety valve; 504 a heat exchange temperature sensor; 6, cleaning the device; 601 concentrated acid storage tank; 6011 acid adding pipe; 6012 acid metering pump; 602 cleaning a buffer tank; 6021 cleaning the liquid outlet pipe; 6022 cleaning the circulation tube; 6023 water supplementing pipe; 603 washing the pump; 604 self priming pump; 605 corrosion inhibitor storage tank; 6051 corrosion inhibitor adding pipe; 6052 corrosion inhibitor metering pump; 606 a stirring mechanism; 7 kinds of mother liquor pipes.701 second flowmeter; 8 evaporating a raw liquid pipe; 801 evaporating a raw liquid pump; 9, a steam-water separator; 10 seminal fluid cooling plate heat exchanger.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved by the embodiments of the present utility model more clear, the present utility model is further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. In addition, the connection may be for both the fixing action and the circuit communication action.

It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing embodiments of the utility model and to simplify the description by referring to the figures, rather than to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the embodiments of the present utility model, the meaning of "plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1, the exhaust steam utilization system of a hot water tank 4 in alumina production disclosed in an embodiment of the utility model comprises a dilution tank 1, a water heater 2 is arranged at the top of the dilution tank 1, a water inlet of the water heater 2 is communicated with one end of a new water pipe 3, the other end of the new water pipe 3 is communicated with an external water plant or evaporation recovered sewer water, specifically, a water supply pump 301, a water supply flowmeter 302 and a water supply valve 303 are arranged on the new water pipe 3, the sewer water from the external water plant or evaporation recovered sewer water is pumped into the water heater 2 through the water supply pump 301, the water inflow is metered through the water supply flowmeter 302, the on-off control is performed through the on-off control of the water supply valve 303, and the water supply valve 303 is a stop valve. The exhaust steam inlet of the washing water heater 2 is communicated with a first exhaust steam pipe 101 communicated with an exhaust steam outlet at the top of the dilution tank 1, a first exhaust pipe 1011 and a first exhaust valve 1012 are also communicated with the first exhaust steam pipe 101, the first exhaust pipe 1011 is communicated with the external atmosphere, the on-off of the first exhaust pipe 1011 is controlled by the first exhaust valve 1012 and is used for exhausting exhaust steam to the external atmosphere under special conditions, for example, when the washing water heater 2 breaks down, exhaust steam in the dilution tank 1 can be exhausted to the external atmosphere through the first exhaust pipe 1011, and the exhaust path of the exhaust steam in the dilution tank 1 is changed. The hot water outlet of the washing water heater 2 is communicated with the hot water tank 4 through a hot water pipe 201, a hot water valve 2011 is arranged on the hot water pipe 201, a liquid level sensor (not shown) and a temperature sensor 402 are arranged on the hot water tank 4, exhaust steam flashed from the dilution tank 1 is introduced into the washing water heater 2 through a first exhaust steam pipe 101, mixed heating is carried out in the washing water heater 2 with new water from an external water plant or evaporation recovered sewage, heated hot water is conveyed to the hot water tank 4 through the hot water pipe 201 to be stored for cleaning red mud, and the temperature sensor 402, the liquid level sensor and the water inflow of the new water or evaporation sewage on the hot water tank 4 are controlled in an interlocking mode.

The embodiment further comprises a heat exchanger 5 and a cleaning device 6, wherein a heat medium inlet of the heat exchanger 5 is communicated with one end of a second exhaust steam pipe 401, the other end of the second exhaust steam pipe 401 is communicated with an exhaust steam outlet at the top of a hot water tank 4, a second exhaust steam valve 4011 for controlling on-off is arranged on the second exhaust steam pipe 401, a second exhaust pipe 4012 and a second exhaust valve 4013 are further communicated on the second exhaust steam pipe 401, the second exhaust pipe 4012 is communicated with the external atmosphere, the on-off of the second exhaust pipe 4012 is controlled through the second exhaust valve 4013, and the exhaust steam in the hot water tank 4 can be exhausted to the external atmosphere through the second exhaust pipe 4012 under special conditions when the heat exchanger 5 fails; the heat medium outlet of the heat exchanger 5 is communicated with one end of a condensate water recovery pipe 501, the other end of the condensate water recovery pipe 501 is communicated with a hot water tank 4, the cold medium inlet of the heat exchanger 5 is communicated with one end of a seed precipitation mother liquor pipe 7, the cold medium outlet of the heat exchanger 5 is communicated to an evaporation raw liquor tank (not shown) through an evaporation raw liquor pipe 8, the seed precipitation mother liquor after the temperature of the refined solution is reduced is subjected to heat exchange and heating preheating with exhaust steam from the hot water tank 4 in the heat exchanger 5, the seed precipitation mother liquor after the heating and preheating enters the evaporation raw liquor tank through the evaporation raw liquor pipe 8, specifically, the temperature of the seed precipitation mother liquor before entering the heat exchanger 5 is 48-52 ℃, and the temperature after the heat exchange is 58-62 ℃; after heat exchange, the exhaust steam condensate water is sent back to the hot water tank 4 through the condensate water recovery pipe 501, the condensate water recovery pipe 501 is provided with a condensate water recovery pump 5011 and a condensate water recovery valve 5012, and the cleaning device 6 is communicated with the heat exchanger 5 and is used for cleaning scale in the heat exchanger 5, so that the heat exchange efficiency is improved, and the utilization rate of the exhaust steam is further improved.

Referring to fig. 2, the cleaning device 6 includes a concentrated acid storage tank 601, a cleaning buffer tank 602, a cleaning pump 603 and a self priming pump 604, wherein the concentrated acid storage tank 601 is communicated with the cleaning buffer tank 602 through an acid adding pipe 6011, the cleaning buffer tank 602 is respectively communicated with a cold medium inlet of the heat exchanger 5 and a heat medium inlet of the heat exchanger 5 through a cleaning liquid outlet pipe 6021, the cleaning pump 603 is communicated with the cleaning liquid outlet pipe 6021, the cleaning buffer tank 602 is respectively communicated with a heat medium outlet of the heat exchanger 5 and a cold medium outlet of the heat exchanger 5 through a cleaning circulating pipe 6022, the self priming pump 604 is communicated with the cleaning circulating pipe 6022, and the hot water tank 4 is communicated with the cleaning buffer tank 602 through a water supplementing pipe 6023. Specifically, the cleaning pump 603 is connected to the main pipeline of the cleaning liquid outlet pipe 6021, the self-priming pump 604 is connected to the main pipeline of the cleaning circulating pipe 6022, the cleaning liquid outlet pipe 6021 is divided into two branch pipes through a three-way joint, the two branch pipes are respectively provided with a cleaning liquid outlet valve 6027, one branch pipe of the cleaning liquid outlet pipe 6021 is connected to the cold medium inlet of the heat exchanger 5, namely is connected with the seed precipitation mother liquor pipe 7, the other branch pipe is connected to the heat medium inlet of the heat exchanger 5, namely is connected with the second exhaust steam pipe 401, one branch pipe is used for cleaning the pipe side of the heat exchanger 5, the other branch pipe is used for cleaning the shell side of the heat exchanger 5, namely is used for cleaning the path through which the cold medium and the heat medium pass respectively, when the temperature rising and preheating temperature of the seed precipitation mother liquor is lower than 6 ℃ (temperature data are acquired through the cold medium inlet and outlet set temperature sensors of the heat exchanger 5), the heat exchange work can be stopped when the scale formation of the inner wall of the pipeline of the heat exchanger 5 is judged to be serious, and the cleaning device 6 is opened for circulation cleaning; in the same way, the self-priming pump 604 is communicated on the main pipeline of the cleaning circulation pipe 6022, the cleaning circulation pipe 6022 is divided into two branch pipes through a three-way joint, the two branch pipes are respectively provided with a cleaning circulation valve 6028, one branch pipe of the cleaning circulation pipe 6022 is communicated with the cold medium outlet of the heat exchanger 5, namely is communicated with the evaporation raw liquid pipe 8, and the other branch pipe is communicated with the heat medium outlet of the heat exchanger 5, namely is communicated with the condensed water recovery pipe 501, so that the circulation cleaning of the heat exchanger 5 is realized, and the heat exchange efficiency of the heat exchanger 5 is improved.

An acid adding metering pump 6012 is communicated with an acid adding pipe 6011, a water supplementing pump 6024 and a first flowmeter 6025 are communicated with a water supplementing pipe 6023, and the acid adding metering pump 6012 and the first flowmeter 6025 are used for metering the mixing amount of acid adding and heating water into the cleaning buffer tank 602 so as to ensure that the acid washing concentration is controlled to be 8-10%, and the cleaning efficiency is improved; specifically, a water supplementing valve 6026 is further arranged on the water supplementing pipe 6023 and used for controlling on-off of the water supplementing pipe 6023, and the acid adding metering pump 6012 adopts a diaphragm metering pump.

The cleaning device 6 further comprises a corrosion inhibitor storage tank 605, the corrosion inhibitor storage tank 605 is communicated with the cleaning buffer tank 602 through a corrosion inhibitor adding pipe 6051, a corrosion inhibitor metering pump 6052 is communicated with the corrosion inhibitor adding pipe 6051, corrosion of metal pipelines in the heat exchanger 5 can be prevented or slowed down by adding the corrosion inhibitor into the cleaning solution, the adding amount of the corrosion inhibitor is 0.1% -1%, and the corrosion inhibitor metering pump 6052 adopts a diaphragm metering pump.

The stirring mechanism 606 is arranged on the cleaning buffer tank 602, and the stirring mechanism 606 is used for fully and uniformly mixing after adding acid, heating water or adding corrosion inhibitor, so that the cleaning efficiency is improved.

Referring to fig. 1 again, a steam-water separator 9 is arranged at the top of the hot water tank 4, an inlet of the steam-water separator 9 is communicated with a dead steam outlet at the top of the hot water tank 4, a vapor phase outlet of the steam-water separator 9 is communicated with a second dead steam pipe 401, a liquid phase outlet of the steam-water separator 9 is communicated with the hot water tank 4, after the dead steam generated in the hot water tank 4 is separated by the steam-water separator 9, liquid flows back into the hot water tank 4, and the vapor dead steam enters the heat exchanger 5 through the second dead steam pipe 401 to be used for heating seed precipitation mother liquor.

The first exhaust steam pipe 101 is also communicated with a steam dividing pipe 1014, the steam dividing pipe 1014 is communicated with a heat medium inlet of the heat exchanger 5, a steam dividing valve 1013 is arranged on the steam dividing pipe 1014, exhaust steam discharged from the dilution tank 1 enters the washing water heater 2 for heating red mud washing water, and surplus exhaust steam heat can be connected with the second exhaust steam pipe 401 in parallel through the steam dividing pipe 1014 and is simultaneously communicated with the heat medium inlet of the heat exchanger 5 for preheating seed precipitation mother liquor, so that waste caused by emptying of the rich exhaust steam of the dilution tank 1 is avoided.

The second flowmeter 701 is arranged on the seed precipitation mother liquor pipe 7, the other end of the seed precipitation mother liquor pipe 7 is communicated with the semen cooling plate type heat exchanger 10, the evaporation raw liquor pipe 8 is provided with an evaporation raw liquor pump 801, and concretely, the pipe diameters of the seed precipitation mother liquor pipe 7 and the evaporation raw liquor pipe 8 are DN300.

The heat exchanger 5 includes a tank 502 and a heat exchange coil (not shown) installed in the tank 502, a seed precipitation mother liquor pipe 7 is communicated with an inlet of the heat exchange coil, an evaporation raw liquor pipe 8 is communicated with an outlet of the heat exchange coil, the seed precipitation mother liquor enters a pipe side of the heat exchanger 5, a second exhaust steam pipe 401 is communicated with the inlet of the tank 502, a condensed water recovery pipe 501 is communicated with an outlet of the tank 502, exhaust steam enters a shell side of the heat exchanger 5, and a heat exchange temperature sensor 504 is further arranged on the tank 502.

The top of the tank 502 is provided with a safety valve 503 to ensure safe operation of the heat exchanger 5.

The background section of the present utility model may contain background information about the problems or environments of the present utility model and is not necessarily descriptive of the prior art. Accordingly, inclusion in the background section is not an admission of prior art by the applicant.

The foregoing is a further detailed description of the utility model in connection with specific/preferred embodiments, and it is not intended that the utility model be limited to such description. It will be apparent to those skilled in the art that several alternatives or modifications can be made to the described embodiments without departing from the spirit of the utility model, and these alternatives or modifications should be considered to be within the scope of the utility model. In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "preferred embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Those skilled in the art may combine and combine the features of the different embodiments or examples described in this specification and of the different embodiments or examples without contradiction. Although embodiments of the present utility model and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the utility model as defined by the appended claims.

Claims (10)

1. The utility model provides a hot water tank exhaust steam utilization system in alumina production, includes the diluting tank, diluting tank top is equipped with the washing water heater, the water inlet and the new water pipe intercommunication of washing water heater, the steam inlet and the intercommunication of washing water heater are in the first exhaust steam pipe intercommunication of diluting tank top exhaust steam export, the hot water export of washing water heater pass through the hot-water line with hot water tank intercommunication, its characterized in that: the heat exchanger is characterized by further comprising a heat exchanger and a cleaning device, wherein a heat medium inlet of the heat exchanger is communicated with a waste steam outlet of the hot water tank through a second waste steam pipe, a heat medium outlet of the heat exchanger is communicated with the hot water tank through a condensed water recovery pipe, a cold medium inlet of the heat exchanger is communicated with one end of a seed precipitation mother liquor pipe, a cold medium outlet of the heat exchanger is communicated to an evaporation raw liquor tank through an evaporation raw liquor pipe, and the cleaning device is communicated with the heat exchanger.

2. The hot water tank exhaust steam utilization system of claim 1, wherein: the cleaning device comprises a concentrated acid storage tank, a cleaning buffer tank, a cleaning pump and a self-priming pump, wherein the concentrated acid storage tank is communicated with the cleaning buffer tank through an acid adding pipe, the cleaning buffer tank is respectively communicated with a cold medium inlet of the heat exchanger and a heat medium inlet of the heat exchanger through a cleaning liquid outlet pipe, the cleaning pump is communicated with the cleaning liquid outlet pipe, the cleaning buffer tank is respectively communicated with a cold medium outlet of the heat exchanger and a heat medium outlet of the heat exchanger through a cleaning circulating pipe, the self-priming pump is communicated with the cleaning circulating pipe, and the hot water tank is communicated with the cleaning buffer tank through a water supplementing pipe.

3. The hot water tank exhaust steam utilization system as claimed in claim 2, wherein: the acid adding pipe is communicated with an acid adding metering pump, and the water supplementing pipe is communicated with a water supplementing pump and a first flowmeter.

4. The hot water tank exhaust steam utilization system as claimed in claim 3, wherein: the cleaning device further comprises a corrosion inhibitor storage tank, the corrosion inhibitor storage tank is communicated with the cleaning buffer tank through a corrosion inhibitor adding pipe, and a corrosion inhibitor metering pump is communicated with the corrosion inhibitor adding pipe.

5. The hot water tank exhaust steam utilization system according to claim 3 or 4, wherein: and the cleaning buffer groove is provided with a stirring mechanism.

6. The hot water tank exhaust steam utilization system of claim 1, wherein: the top of the hot water tank is provided with a steam-water separator, the inlet of the steam-water separator is communicated with the exhaust steam outlet of the hot water tank, the vapor phase outlet of the steam-water separator is communicated with the heat medium inlet of the heat exchanger through the second exhaust steam pipe, and the liquid phase outlet of the steam-water separator is communicated with the hot water tank.

7. The hot water tank exhaust steam utilization system as claimed in claim 6, wherein: the first exhaust steam pipe is communicated with a steam distributing pipe, and the steam distributing pipe is communicated with a heat medium inlet of the heat exchanger.

8. The hot water tank exhaust steam utilization system of claim 1, wherein: the seed precipitation mother liquor pipe is provided with a second flowmeter, the other end of the seed precipitation mother liquor pipe is communicated with the semen cooling plate type heat exchanger, and the evaporation raw liquor pipe is provided with an evaporation raw liquor pump.

9. The hot water tank exhaust steam utilization system of claim 8, wherein: the heat exchanger comprises a tank body and a heat exchange coil pipe arranged in the tank body, the seed precipitation mother liquor pipe is communicated with an inlet of the heat exchange coil pipe, the evaporation raw liquor pipe is communicated with an outlet of the heat exchange coil pipe, the second exhaust steam pipe is communicated with an inlet of the tank body, and the condensed water recovery pipe is communicated with an outlet of the tank body.

10. The hot water tank exhaust steam utilization system of claim 9, wherein: the top of the tank body is provided with a safety valve.