阅读说明：本技术 一种利用工艺余热和排汽余热的蒸汽喷射真空泵机组 (Steam jet vacuum pump unit utilizing process waste heat and exhaust waste heat ) 是由 王宇志 王霁 于 2020-12-17 设计创作，主要内容包括：本发明公开了一种利用工艺余热和排汽余热的蒸汽喷射真空泵机组,包括：热水罐A仓,其内用于盛装热源水。热水罐B仓,其内用于盛装次低温水。蒸汽喷射真空泵机组,为多级设置,且由前到后依次串联连接,各级中由前到后均由串联连接的冷凝器和喷射泵组成；其中,末级喷射泵的出口通过管路与热水罐A仓相连接,用于将废蒸汽导入所述热水罐A仓中的热源水中。吸收式制冷机,其蒸发器的进出口端分别与所述热水罐B仓和热水罐D仓管路连接,形成低温水流通通道,将低温水在其内降温后,在出口端得到低温水。该真空泵机组利用无压力废蒸汽的热量生产出自然环境不能稳定供应的低温水,作为冷凝器的冷却用水,节约了工作蒸汽和冷却水量。(The invention discloses a steam jet vacuum pump unit using process waste heat and exhaust waste heat, which comprises: the hot water tank A is used for containing heat source water. And the hot water tank B is used for containing secondary low-temperature water. The steam jet vacuum pump unit is arranged in a multistage manner and is sequentially connected in series from front to back, and each stage consists of a condenser and a jet pump which are connected in series from front to back; the outlet of the final-stage jet pump is connected with the hot water tank A bin through a pipeline and used for guiding the waste steam into the heat source water in the hot water tank A bin. The inlet and outlet ends of the evaporator of the absorption refrigerator are respectively connected with the hot water tank B bin and the hot water tank D bin through pipelines to form a low-temperature water circulation channel, and low-temperature water is cooled in the low-temperature water circulation channel and then is obtained at the outlet end. The vacuum pump unit utilizes the heat of the non-pressure waste steam to produce low-temperature water which cannot be stably supplied in the natural environment and is used as cooling water of the condenser, so that the working steam and the cooling water quantity are saved.)

1. A steam jet vacuum pump unit using process waste heat and exhaust waste heat is characterized by comprising:

the hot water tank A bin (18) is used for containing heat source water;

the hot water tank B bin (21) is used for containing secondary low-temperature water;

the steam jet vacuum pump unit is arranged in a multistage manner and is sequentially connected in series from front to back, and each stage consists of a condenser and a jet pump which are connected in series from front to back; wherein, the outlet of the final jet pump is connected with the hot water tank A bin (18) through a pipeline and is used for leading the waste steam into the heat source water in the hot water tank A bin (18);

the absorption refrigerator (16), its both ends of generator connect with said hot water pot A storehouse (18) pipeline separately, regard hot source water as the heat source, form the circulation loop of hot source water circulation; the inlet and outlet ends of the evaporator are respectively connected with the hot water tank B bin (21) and the hot water tank D bin (23) through pipelines to form a low-temperature water circulation channel, and low-temperature water is cooled in the low-temperature water circulation channel and then is obtained at the outlet end.

2. The steam jet vacuum pump unit using the process waste heat and the exhaust waste heat according to claim 1, wherein the temperature of the low-temperature water is 1-20 ℃.

3. The steam jet vacuum pump unit using the process waste heat and the exhaust waste heat according to claim 1 or 2, wherein each of the condensers is a direct condenser or an indirect condenser.

4. The steam jet vacuum pump unit using the process waste heat and the exhaust waste heat according to claim 3, wherein a low-temperature water outlet of the absorption refrigerator (16) is communicated with a front-most condenser pipeline for conveying the low-temperature water pipeline to the front-most condenser spraying device as low-temperature water for condensation.

5. The steam jet vacuum pump unit using the process waste heat and the exhaust waste heat according to claim 4, wherein the spray devices of the other condensers at each stage are communicated with the condenser pipeline at the foremost end, and are used for inputting the low-temperature water for cooling sprayed in the condenser at the foremost end into each spray device.

6. The steam jet vacuum pump unit using the process waste heat and the exhaust waste heat according to claim 5, wherein the water outlets of the other condensers at each stage are further connected with the hot water tank B (21) through a pipeline, and are used for inputting the sprayed water into the hot water tank B (21).

7. The steam jet vacuum pump unit using the process waste heat and the exhaust waste heat according to claim 6, wherein a hot water tank D (21) is provided on a connection pipeline of the front-most condenser and the absorption refrigerator (16) for containing low-temperature water.

8. The steam jet vacuum pump unit using the process waste heat and the exhaust waste heat according to claim 7, characterized in that a two-stage jet pump is connected in series in front of the foremost condenser, and the front jet pump is connected with the vacuum tank (1) through a pipeline, is used for conveying the steam in the vacuum tank (1) from front to back, and is discharged by a final jet pump;

each jet pump is connected with a steam source supply device (5) through a pipeline, and the steam source supply device (5) is used for providing power steam.

9. The steam jet vacuum pump unit using the process waste heat and the exhaust waste heat according to claim 8, wherein the hot water tank A bin (18), the hot water tank B bin (21), the hot water tank C bin (23) and the hot water tank D bin (23) are arranged in parallel in the same tank body, and the upper parts of the bins are communicated.

10. The steam jet vacuum pump unit using the process waste heat and the exhaust waste heat according to claim 6, 7, 8 or 9, wherein each condenser is independently and horizontally arranged in the steam jet vacuum pump unit; or all the condensers are stacked in sequence in the vertical direction, and the condenser at the top layer is the condenser at the foremost end.

Technical Field

The invention belongs to the technical field of waste heat utilization, and particularly relates to a steam jet vacuum pump unit utilizing process waste heat and exhaust waste heat.

Background

Steam jet vacuum pumps are widely used in many industrial fields, such as vacuum degassing of molten steel, concentration of medical raw materials, purification of natural pigments, molecular distillation, petroleum distillation, fractionation, urea synthesis and granulation, refining of edible oils, high altitude simulation of aerospace and aeroengine, and the like.

The steam jet vacuum pump has two application forms of a steam jet vacuum pump unit and a steam jet water ring vacuum pump unit. A large amount of steam is discharged only at the final stage of the steam jet vacuum pump unit, and a large amount of waste heat is to be utilized in the production process.

The steam jet vacuum pump unit applied at present has two types of domestic and imported steam and cooling water consumption indexes which are basically consistent and have little difference. The inlet steam jet vacuum pump unit usually adopts higher steam pressure of 1.0-1.4 MPa.G; the steam pressure of domestic vacuum pumps is generally 0.8-1.2 MPa. The water is fed at the normal temperature of 35 ℃.

However, the operating pressure of condenser one must be higher than the saturated vapor pressure of the 35 degrees feed water. The steam consumption and the cooling water consumption of the first condenser are high in both the two-stage supercharging ejector and the three-stage supercharging ejector. In summer high-temperature and high-humidity weather, the efficiency of the cooling tower is reduced, the cooling water exceeds 35 ℃, the vacuum degree required by the process is seriously influenced, and the product reject ratio is increased greatly. In addition, the waste steam discharged by the final-stage jet pump is discharged into a final-stage condenser and is condensed by cooling water, the heat content of the discharged waste steam is large, a large amount of cooling water is required to be condensed, and then the waste steam is sent into a cooling tower for cooling, so that the load and the cooling water quantity of the cooling tower are increased, and a large amount of waste heat is wasted. In addition, the working steam with the pressure of 1.0-1.5MPa.G adopted by the steam jet vacuum pump unit not only increases the cost of equipment and valves, but also limits the application of central heating and the utilization of waste heat.

Disclosure of Invention

The present invention is directed to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a steam jet vacuum pump unit using process waste heat and exhaust waste heat, which uses the heat of non-pressure waste steam to produce low-temperature water that cannot be stably supplied in the natural environment, as cooling water for a condenser, and has a stable and low temperature of inlet water, thereby saving the amount of working steam and cooling water.

In order to solve the technical problems, the invention adopts the technical scheme that a steam jet vacuum pump unit utilizing process waste heat and exhaust steam waste heat comprises:

the hot water tank A is used for containing heat source water. And the hot water tank B is used for containing secondary low-temperature water.

The steam jet vacuum pump unit is arranged in a multistage manner and is sequentially connected in series from front to back, and each stage consists of a condenser and a jet pump which are connected in series from front to back; wherein, the outlet of the final jet pump is connected with the hot water tank A bin through a pipeline and used for leading the waste steam into the heat source water in the hot water tank A bin.

The absorption refrigerator has two ends connected to the pipeline of the hot water tank A and heat source water as heat source to form heat source water circulating loop; the inlet and outlet ends of the evaporator are respectively connected with the hot water tank B chamber and the hot water tank D chamber through pipelines to form a low-temperature water circulation passage, and low-temperature water is cooled in the low-temperature water circulation passage to obtain low-temperature water at the outlet end.

Further, the temperature of the low-temperature water is 1-20 ℃.

Further, each condenser is a direct condenser or an indirect condenser.

Furthermore, the low-temperature water outlet of the absorption refrigerator is communicated with the front condenser pipeline and used for conveying the low-temperature water pipeline to the front condenser spraying device to be used as low-temperature water for condensation.

Furthermore, the spray devices of the other condensers at each stage are communicated with the condenser pipeline at the forefront end and are used for inputting the sprayed cooling low-temperature water in the condenser at the forefront end into each spray device.

Furthermore, the water outlets of other condensers at all stages are also connected with a pipeline of the hot water tank B bin and used for inputting water after spraying into the hot water tank B bin.

Furthermore, a hot water tank D bin is arranged on a connecting pipeline of the condenser at the foremost end and the absorption refrigerator and is used for containing low-temperature water.

Furthermore, a two-stage injection pump is connected in series in front of the foremost condenser, the front injection pump is connected with the vacuum tank through a pipeline, and is used for conveying the vacuum tank from front to back and discharging the vacuum tank from the last injection pump;

each jet pump is connected with a steam source supply device through a pipeline, and the steam source supply device is used for providing power steam.

Furthermore, the hot water tank A bin, the hot water tank B bin, the hot water tank C bin and the hot water tank D bin are arranged in the same tank body in parallel, and the upper parts of the bins are communicated.

Furthermore, in the steam jet vacuum pump unit, each condenser is independently and horizontally arranged; or all the condensers are stacked in sequence in the vertical direction, and the condenser at the top layer is the condenser at the foremost end.

The invention has the following advantages: 1. the water in the hot water tank A is heated by the non-pressure waste steam discharged by the final-stage jet pump, is connected with absorption refrigeration equipment to produce low-temperature water, and then is sent into a first condenser to be used as cooling inlet water. The low-temperature water inlet enables the working point of the first condenser to be advanced, about 30% of steam and about 20% of cooling water can be saved, so that the load of a cooling tower is reduced, and low-temperature water which cannot be stably supplied in the natural environment is produced by using the heat of waste steam. 2. The low-temperature water produced by the process waste heat and the exhaust waste heat has stable and lower water inlet temperature, and saves working steam and cooling water. Meanwhile, adverse effects caused by the fact that the temperature of cooling water exceeds 35 ℃ in high-temperature and high-humidity weather in summer are thoroughly eliminated, and the quality and the yield of products are guaranteed. 3. The working point of the first condenser is advanced, the compression ratio of the first-stage injection pump and the second-stage injection pump is greatly reduced, and good conditions are provided for adopting low-pressure steam as working power; creating conditions for the purpose of producing low-pressure steam by utilizing waste heat.

Drawings

FIG. 1 is a schematic structural diagram of a steam jet vacuum pump unit utilizing process waste heat and exhaust waste heat according to the present invention;

wherein: 1. a vacuum tank; 2. a first dust remover; 3. a second dust remover; 4. a master cut-off valve; 5. a steam source supply device; 6. a first stage jet pump; 7. a second stage jet pump; 8. a first condenser; 9. a tertiary jet pump; 10. a second condenser; 11. a four-stage jet pump; 12. a third condenser; 13. a five-stage jet pump; 14. a cooling tower; 15. a fifth water pump; 16. an absorption refrigeration device; 17. a first water pump; 18. a hot water tank A cabin; 19. a second water pump; 20. a third water pump; 21. a hot water tank B cabin; 22. a hot water tank C; 23. a hot water tank D bin; 24. and a fourth water pump.

Detailed Description

The invention relates to a steam jet vacuum pump unit using process waste heat and exhaust waste heat, as shown in figure 1, comprising: the hot water tank A bin 18 is used for containing heat source water; and the hot water tank B bin 21 is used for containing secondary low-temperature water.

The steam jet vacuum pump unit is arranged in a multistage manner and is sequentially connected in series from front to back, and each stage consists of a condenser and a jet pump which are connected in series from front to back; wherein, the outlet of the final injection pump is connected with the hot water tank A cabin 18 through a pipeline and is used for leading the steam into the heat source water in the hot water tank A cabin 18.

The absorption refrigerator 16, its generator both ends connect with hot water pot A storehouse 18 pipelines separately, regard hot source water as the heat source, form the circulation loop of hot source water circulation; the inlet and outlet ends of the evaporator are respectively connected with a pipeline 21 of the hot water tank B to form a refrigerant circulation loop, and low-temperature water is obtained at the outlet end after the refrigerant is cooled in the refrigerant circulation loop. The temperature of the low-temperature water is 1-20 ℃. The water in the hot water tank A is heated by the non-pressure waste steam discharged by the final-stage jet pump, is connected with absorption refrigeration equipment to produce low-temperature water, and then is sent into a first condenser 8 to be used as cooling inlet water. The low-temperature water inlet advances the working point of the first condenser, about 30 percent of steam and about 30 percent of cooling water can be saved, so that the load of a cooling tower is reduced, and the heat of the waste steam is used for producing low-temperature water with constant temperature. In order to prevent the steam quantity discharged by the final-stage jet pump from being incapable of meeting the heat quantity required in the hot water tank A bin, a process waste heat source can be additionally connected in the hot water tank A bin through a pipeline to serve as a supplementary heat source.

The low-temperature water outlet of the absorption refrigerator 16 is communicated with the foremost condenser pipe line, and is used for conveying the low-temperature water pipe line to the foremost condenser spraying device as spraying water. A hot water tank D tank 21 for containing low-temperature water is provided in a connection pipe between the condenser at the forefront end and the absorption refrigerator 16.

The front end of the condenser at the most front end is connected with a two-stage jet pump in series, and the front end jet pump is connected with the vacuum tank 1 through a pipeline and used for transmitting the waste gas in the vacuum tank 1 from front to back and discharging the waste gas from the last stage jet pump.

Each jet pump is connected with a steam source supply device 5 through a pipeline, and the steam source supply device 5 is used for supplying power steam.

The hot water tank A bin 18, the hot water tank B bin 21, the hot water tank C bin 23 and the hot water tank D bin 23 are arranged in parallel in the same tank body, and the upper parts of the bins are communicated. When the water amount in a certain bin is large, the water overflows from the upper part and enters other bins.

In the steam jet vacuum pump unit, each condenser is independently and horizontally arranged and is placed on the bearing platform. Or all the condensers are stacked in sequence in the vertical direction, and the condenser at the top layer is the condenser at the foremost end.

One arrangement of the steam jet vacuum pump unit is as follows: the steam jet vacuum pump unit is arranged in three stages, the three condensers are independently arranged and are respectively and horizontally placed on the bearing platform.

Another arrangement of the above steam injection vacuum pump unit is as follows: the steam jet vacuum pump unit is arranged in three stages, and the three condensers are stacked in sequence in the vertical direction; the condenser has height, and when placing in the stack, the condenser of lower part is equivalent to placing in certain height department, and the condenser of upper portion can realize in water and gas transport to the condenser of lower part under the effect of gravity when during operation. And a bearing platform is not required to be built for placing each condenser, so that the cost and the field are saved.

As an embodiment of the present invention, the steam jet vacuum pump unit is exemplified by three stages; the three-stage jet pump 9, the four-stage jet pump 11 and the five-stage jet pump 13 are respectively named from front to back or from top to bottom, condensers connected in series in each stage are respectively a first condenser 8, a second condenser 10 and a third condenser 12 from front to back or from top to bottom. Each condenser is a direct condenser or an indirect condenser. Is provided with an air inlet, an air outlet, a water inlet and a water outlet.

When the condenser is a direct condenser, the direct condenser is a vacuum container and is provided with an air inlet, an air outlet, a water inlet and a water outlet; spraying devices are arranged in the spraying device; the spraying device is used for spraying low-temperature water and is connected with the water inlet pipeline. The water inlet is generally arranged at the upper part or the middle part of each condenser. The water outlet is positioned at the lower part. The air inlet and the air outlet have no strict position requirement, and the air inlet is generally arranged in the middle, while the air outlet is arranged at the upper part.

In the case of an indirect condenser, the low-temperature water and the mixed gas are not in direct contact, one of the low-temperature water and the mixed gas is in a tube pass and the other is in a shell pass. The positions of the intake and exhaust ports are determined by design conditions.

Two stages of steam jet vacuum pumps, namely a first stage jet pump 6 and a second stage jet pump 7, are connected in series in front of the first condenser 8, and the first stage jet pump 6 is connected with the vacuum tank 1 through a pipeline. The vacuum tank 1 is used for containing objects to be treated. Each stage of injection pump is connected with a steam source supply device 5 through a pipeline, the steam source supply device 5 provides steam for each steam injection vacuum pump to serve as power steam so as to carry gas pumped out of the vacuum tank 1 to be conveyed in the pipeline, and the pressure of the outlet of the second stage of injection pump 7 reaches a set pressure and is matched with the heat exchange of low-temperature water. A first dust remover 2 and a second dust remover 3 are sequentially connected between the vacuum tank 1 and the first-stage jet pump 6, and a main stop valve 4 is arranged on an outlet pipeline of the second dust remover 3. The impurities in the gas pumped out from the vacuum tank 1 are filtered after passing through the first dust remover 2 and the second dust remover 3.

In this embodiment, a hot water tank is provided, and a cavity of the hot water tank is divided into a hot water tank a chamber 18, a hot water tank B chamber 21, a hot water tank C chamber 21 and a hot water tank D chamber 23 along a horizontal direction, wherein the hot water tank a chamber 18 contains hot source water, and the hot water tank B chamber 21 contains refrigerant water. The upper spaces of the hot water tank A bin 18, the hot water tank B bin 21, the hot water tank C bin 21 and the hot water tank D bin 23 are not isolated, the bins are communicated, and when water in one bin is excessive, the water can flow to other bins. The front end of the hot water tank A bin 18 is provided with a buffer bin, so that the exchange water after heat exchange flows into the buffer bin firstly to play a role of buffering. Because the temperature of the heat source water in the hot water tank A bin 18 is high, a vertical heat insulation plate is also arranged between the hot water tank A bin 18 and the hot water tank B bin 21.

In the present embodiment, the exhaust steam discharged from the end of the five-stage ejector pump 13 is used as a heat source of the refrigerator 16. The steam outlet of the five-stage jet pump 13 is connected with an inlet pipeline of the hot water tank A bin 18, so that the steam at the tail end of the five-stage jet pump 13 is discharged into heat source water, heat is released in the heat source water, and the temperature of the heat source water is increased to over 85 ℃. The heated heat source water serves as a heat source of the absorption refrigeration equipment 16. Two ends of a generator of the absorption refrigeration equipment 16 are respectively connected with a pipeline of a hot water tank A cabin 18 to form a heat source water circulation loop. The heat source water in the hot water tank A bin 18 flows into the buffer bin after passing through the generator and then returns to the hot water tank A bin 18.

Meanwhile, the hot water tank B chamber 21 is connected with a channel pipeline where an evaporator of the absorption refrigeration equipment 16 is located to form a low-temperature water circulation channel, and after the secondary low-temperature water is cooled in the channel pipeline, the low-temperature water with the temperature of 1-20 ℃ is obtained at the outlet end.

A second water pump 19 is arranged on a pipeline between the hot water tank B chamber 21 and the absorption refrigeration equipment 16. A hot water tank D bin 21 is arranged on a connecting pipeline of the first condenser 8 and the absorption refrigerator 16 and is used for containing low-temperature water. The outlet of the hot water tank D23 is connected with the spraying device pipeline of the first condenser 8, and the pipeline is provided with a fourth water pump 24 so as to convey low-temperature water to the spraying device of the first condenser 8 through the pipeline, and the low-temperature water is mixed with the power steam and the gas carried by the power steam to obtain the sprayed water. The non-condensable mixed gas after primary spraying is conveyed to a third-stage jet pump 9 through a pipeline, pressurized and conveyed to a second condenser 10.

The water outlet of the first condenser 8 is connected with an inlet pipeline of a hot water tank C bin 21, the outlet of the hot water tank C bin 21 is connected with the second condenser 10 and the third condenser 12 through pipelines, a third water pump 20 is arranged on the pipelines to convey sprayed water to the jet flow devices of the second condenser 10 and the third condenser 12, and the sprayed water is sprayed and mixed with input power steam and gas carried by the input power steam in the second condenser 10 to obtain secondary low-temperature water. Meanwhile, the mixed gas after secondary spraying is conveyed to a four-stage jet pump 11 through a pipeline, and after pressurization, the mixed gas is conveyed to a third condenser 12 through a pipeline and is mixed with secondary cold water sprayed by a spraying device of the third condenser 12 to obtain secondary cold water. Meanwhile, the mixed gas after the three-time spraying is conveyed to the third condenser 12 through a pipeline. The water outlets of the second condenser 10 and the third condenser 12 are connected with the inlet pipeline of the hot water tank B bin 21, so that the re-cooled water is conveyed into the hot water tank B bin 21, a water circulation loop is formed, and water is saved.

The working process of the steam jet vacuum pump unit utilizing the process waste heat and the exhaust waste heat comprises the following steps: an object to be treated, such as molten steel, is charged into the vacuum vessel 1. Water is first supplied to each condenser and hot water is supplied to the refrigerator to produce low temperature water. Firstly, a five-stage injection pump 13 is started, then a four-stage injection pump 11, a three-stage injection pump 9, a two-stage steam injection vacuum pump 7 and a one-stage steam injection vacuum pump 6 are started in sequence, meanwhile, steam in a steam source supply device 5 is conveyed to each steam injection vacuum pump 13, the steam discharged from the five-stage injection pump 13 is discharged into a hot water tank A cabin 18 through an outlet, so that the temperature of hot source water in the hot water tank A cabin 18 is rapidly over 85 ℃, the heated hot source water is sent into an absorption refrigerator 16 by a first water pump 17, and the heated hot source water returns to the hot water tank A cabin 18 for circulation after being cooled. And (3) the water in the hot water tank B bin 21 enters refrigeration equipment, the temperature is reduced to obtain low-temperature water at 1-20 ℃, and then the low-temperature water is conveyed to a hot water tank D bin 23 through a pipeline. And the mixture is conveyed into the first condenser 8 by a fourth water pump 24, sprayed, heated and discharged into a hot water tank B21. Then the mixture is sent to a second condenser 10 and a third condenser 12 by a third water pump 20 for spraying and heat absorption, and the mixture is discharged into a hot water tank B19 after being heated. Waste gas and impurities generated by objects to be treated in the vacuum tank 1 are removed through the first dust remover 2 and the second dust remover 3, and the rest waste gas is discharged into a hot water tank A bin through the main stop valve 4, each stage of injection pump and the condenser, so that the vacuum degree in the vacuum tank 1 meets the process requirement. When the vacuum pumping is stopped, the first-stage steam jet vacuum pump 6 is firstly closed, then the second-stage steam jet vacuum pump 7, the third-stage jet pump 9, the fourth-stage jet pump 11 and the fifth-stage jet pump 13 are sequentially closed, and the steam source supply device 5 is closed.