CN113418320A

CN113418320A - Device for increasing temperature of low-temperature heat source and using method thereof

Info

Publication number: CN113418320A
Application number: CN202110667091.4A
Authority: CN
Inventors: 郑成勋
Original assignee: Zheng Xixun
Current assignee: Zheng Xixun
Priority date: 2021-06-16
Filing date: 2021-06-16
Publication date: 2021-09-21
Anticipated expiration: 2041-06-16
Also published as: CN113418320B

Abstract

The invention discloses a device for increasing the temperature of a low-temperature heat source and a using method thereof, wherein the device comprises a steam source, an absorber connected with the steam source, a primary steam generator, a primary absorber, a secondary evaporation generator, a secondary absorber, an n-stage steam generator, an n-stage absorber, a generator and a condenser, wherein n is more than or equal to 1; the device also comprises a cooling liquid system, wherein the cooling liquid system is sequentially connected with the absorber, the first-stage steam generator, the first-stage absorber, the second-stage evaporation generator, the second-stage absorber, the n-stage steam generator and the n-stage absorber, and the cooling liquid system contains a solution with the same components as the working solution. The device for increasing the temperature of the low-temperature heat source converts the low-temperature heat source with extremely low temperature into the heat source with higher temperature. The method solves the problem that the existing absorption refrigeration mode spreads a large amount of heat to the environment through cooling water and raises the heat energy to a higher temperature.

Description

Device for increasing temperature of low-temperature heat source and using method thereof

Technical Field

The invention belongs to the technical field of devices, and particularly relates to a device for increasing the temperature of a low-temperature heat source.

Background

Currently, in industrial processes, a large amount of low-temperature heat sources are usually generated, especially low-temperature heat sources slightly higher than normal temperature. Such as cooling water produced by power plants and many industries. Meanwhile, the air conditioner also generates a large amount of cooling water, and the cooling water is evaporated in the environment, so that a large amount of water resources are consumed, and the humidity of the small environment is increased.

Besides, a large amount of low-temperature waste heat of more than 200 ℃ at 100 ℃ is waiting for utilization. Meanwhile, a large amount of hot water with low temperature, such as domestic water, is required.

The existing method is to utilize working media with low boiling points and utilize the low-temperature waste heat to generate electricity. Or the lithium bromide absorption refrigeration/heat pump is used for obtaining refrigeration capacity and generating low-temperature hot water for different processes.

Existing lithium bromide absorption refrigeration/heat pumps are not energy efficient and the cooling water spreads more heat to the environment. The method for improving the energy efficiency ratio is to improve the efficiency of evaporating the lithium bromide solution, but due to the property of the lithium bromide solution, the corrosivity is increased when the temperature is too high, so the prior art can only achieve double effects.

The high-temperature hot water generated by the lithium bromide absorption heat pump reaches about 90 degrees at most. The temperature at which the lithium bromide solution generates secondary steam depends on the temperature of the heating, and the concentration of the lithium bromide solution.

The concentration range of the lithium bromide solution is limited due to the influence of the temperature of refrigeration. The existing two-stage lithium bromide refrigeration/heat pump adopts the existing lithium bromide absorption refrigeration/heat pump mode, so the energy efficiency ratio is improved to a limited extent.

In the aspect of seawater desalination, it is a common method to obtain distilled water by means of multi-effect evaporation using low-temperature steam from a power plant. When the seawater is heated in the last effect, the generated secondary steam can not evaporate the seawater any more due to the low temperature and can only be condensed by the environment, and a large amount of latent heat is wasted.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a device for increasing the temperature of a low-temperature heat source, which converts the low-temperature heat source with extremely low temperature into a heat source with higher temperature. The method solves the problem that the existing absorption refrigeration mode spreads a large amount of heat to the environment through cooling water and raises the heat energy to a higher temperature.

The technical purpose of the invention is realized by the following technical scheme: a device for increasing the temperature of a low-temperature heat source comprises a steam source, an absorber connected with the steam source, a primary steam generator, a primary absorber, a secondary evaporation generator, a secondary absorber, an n-stage steam generator, an n-stage absorber, a generator and a condenser, wherein n is more than or equal to 1; the steam source is steam generated by absorbing heat of a low-temperature heat source

The liquid cooling system is sequentially connected with the absorber, the first-stage steam generator, the first-stage absorber, the second-stage evaporation generator, the second-stage absorber, the n-stage steam generator and the n-stage absorber, and the liquid cooling system contains a solution with the same components as a working solution and has a concentration range of 0-100%.

Preferably, the steam source is communicated with a steam cavity of the absorber, the primary steam generator is communicated with the steam cavity of the primary absorber, and a solution outlet of the absorber is connected with a solution inlet of the primary absorber; the solution outlet of the primary absorber is connected with the solution inlet of the secondary absorber; the solution outlet of the secondary absorber is connected with the solution inlet of the n-stage absorber; the solution outlet of the n-stage absorber is connected with the solution inlet of the generator; the solution outlet of the generator is connected with the solution inlet of the absorber.

Preferably, the heat exchanger is connected with the absorber, so that the cooling liquid is communicated with the absorber through the heat exchanger to realize heat exchange.

Preferably, the evaporator further comprises an accumulator, a steam outlet of the generator is connected with an inlet of the accumulator, an outlet of the accumulator is connected with the secondary evaporation generator, and the generation temperature of the secondary evaporation generator is lower than that of the generator.

Preferably, the generator is connected to the discharge end of the compression system.

Preferably, the generator is provided with a plurality of bins, each bin is provided with a steam cavity, and a steam outlet of the steam cavity of the bin is connected with a corresponding place needing heat; a passage is arranged between the bins so as to enable the cooling solution to flow between the bins;

and a solution outlet of the chamber at the last stage is connected with a solution mixer, the solution mixer is also provided with a solution inlet and is connected with a solution outlet of the absorber or a solution outlet of the absorber at any stage, and a solution outlet of the solution mixer is connected with a solution inlet of the absorber.

Preferably, the generator is a single effect or multiple effect evaporation system.

Preferably, the single-effect or multi-effect evaporation system is connected with an absorption refrigeration system, the steam source is connected with a generator steam cavity of the absorption refrigeration system, or the steam source is connected with a cooling system of the absorption refrigeration system; and the solution in the absorption refrigeration system generator is sequentially connected with a condenser of the system, or any one-stage steam generator and any one-stage absorber through the heat exchanger.

Preferably, the absorption refrigeration systems are overlapped, the evaporator of the first-stage refrigeration system, or the refrigerant in the evaporator is connected with the solution in the absorber of the next stage, and the refrigerant of the next-stage absorption refrigeration system is the solution with the concentration not 0.

The invention also provides a use method of the device for increasing the temperature of the low-temperature heat source, which comprises the following steps:

providing a solution with a certain concentration and steam containing solution components;

allowing the working solution to enter an absorber, and allowing the working solution to absorb steam;

passing the cooling liquid into an absorber;

feeding the cooling liquid into a primary steam generator; meanwhile, the working solution absorbing the steam in the absorber enters a primary absorber;

enabling steam generated by the cooling solution entering the primary steam generator to enter a steam cavity of the primary steam generator to be absorbed by the solution in the primary absorber, and enabling the working solution to further absorb the steam from the cooling solution in the primary absorber;

the solution flowing out of the primary steam generator enters a primary absorber, and the generated absorption heat is absorbed by a heat exchanger, so that the temperature of the cooling solution is further increased;

the cooling solution enters an n-stage steam generator, and the generated steam is sent to an n-stage absorber and absorbed by the working solution;

the working solution enters a generator, is heated by a high-temperature heat source in the generator, and the generated steam is conveyed to a place needing heat or enters a condenser for condensation, and the solution with the initial concentration recovered after being concentrated enters an absorber for recycling.

Or the condenser is connected with the required places of various purposes, and the steam generated at high temperature can be stored and used as the heat source of the generator at lower temperature. Even if the heat is radiated to the environment, the heat can be radiated in a sensible heat mode with higher temperature, and the existing steam evaporation mode is replaced.

In conclusion, the invention has the following beneficial effects:

the device for increasing the temperature of the low-temperature heat source comprises a steam source, an absorber connected with the steam source, a primary steam generator, a primary absorber, a secondary evaporation generator, a secondary absorber, an n-stage steam generator, an n-stage absorber, a generator and a condenser, wherein n is more than or equal to 1; the cooling liquid system is sequentially connected with the absorber, the first-stage steam generator, the first-stage absorber, the second-stage evaporation generator, the second-stage absorber, the n-stage steam generator and the n-stage absorber, and the cooling liquid system contains a solution with the same components as the working solution.

In this embodiment, the properties of such solutions are utilized. The solution absorbs the vapor, and the energy of the vapor is transferred to the solution. Cooling water is used to carry away part of the absorbed heat, and the temperature of the cooling water rises and the vapor pressure of the cooling water also rises. Then the steam of the cooling water is transferred to the solution, the solution is transferred to the cooling water at the raised temperature, the ship height rises mutually, finally the solution is heated and evaporated by a high-temperature heat source in a generator, the absorbed water is evaporated, and then the concentrated solution starts the next circulation.

Thus, the low-temperature heat source with extremely low temperature is converted into the heat source with higher temperature. The method solves the problem that the existing absorption refrigeration mode spreads a large amount of heat to the environment through cooling water and raises the heat energy to a higher temperature.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of an apparatus for increasing the temperature of a low-temperature heat source according to the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of an apparatus for increasing the temperature of a low-temperature heat source according to the present invention;

FIG. 3 is a schematic structural diagram of an embodiment of an apparatus for increasing the temperature of a low temperature heat source according to the present invention;

FIG. 4 is a schematic structural diagram of an embodiment of an apparatus for increasing the temperature of a low temperature heat source according to the present invention;

FIG. 5 is a schematic structural diagram of an embodiment of an apparatus for increasing the temperature of a low temperature heat source according to the present invention;

FIG. 6 is a schematic structural diagram of an embodiment of an apparatus for increasing the temperature of a low-temperature heat source according to the present invention.

In the figure:

1. a source of steam; 2. a primary steam generator; 3. an n-stage steam generator; 4. a condenser; 5. an absorber; 6. a primary absorber; 7. an n-stage absorber; 8. a generator; 9. an accumulator; 81. a secondary evaporation generator; 21. a secondary refrigeration system generator; 210. a secondary refrigeration system absorber; 29. and a secondary refrigeration system evaporator.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a device for increasing the temperature of a low-temperature heat source, which converts the low-temperature heat source with extremely low temperature into a heat source with higher temperature. The method solves the problem that the existing absorption refrigeration mode spreads a large amount of heat to the environment through cooling water and raises the heat energy to a higher temperature.

Referring to fig. 1 to 6, wherein the solid line is the solution path and the dashed line is the vapor path, in fig. 3, the n-stage absorber 7: after cooling water in each absorber 5 is heated by the heat exchanger, the solution enters the steam cavity along the ascending pipe, and after the steam-liquid separation, the solution flows back to the heat exchanger along the descending pipe to continue heating, such as a steam drum of a boiler.

The structure of the device for raising the temperature of the low-temperature heat source is described in detail below, and the device for raising the temperature of the low-temperature heat source includes:

the system comprises a steam source 1, an absorber 5 connected with the steam source 1, a primary steam generator 82, a primary absorber 6, a secondary evaporation generator 818, a secondary absorber, an n-stage steam generator 83, an n-stage absorber 7, a generator 8 and a condenser 4, wherein n is more than or equal to 1;

the system further comprises a cooling liquid system, the cooling liquid system is sequentially connected with the absorber 5, the primary steam generator 82, the primary absorber 6, the secondary evaporation generator 818, the secondary absorber, the n-stage steam generator 83 and the n-stage absorber 7, and the cooling liquid system contains a solution with the same components as the working solution.

Preferably, the steam source 1 is communicated with a steam cavity of the absorber 5, the primary steam generator 82 is communicated with a steam cavity of the primary absorber 6, and a solution outlet of the absorber 5 is connected with a solution inlet of the primary absorber 6; the solution outlet of the primary absorber 6 is connected with the solution inlet of the secondary absorber; the solution outlet of the secondary absorber is connected with the solution inlet of the n-stage absorber 7; the solution outlet of the n-stage absorber 7 is connected with the solution inlet of the generator 8; the solution outlet of the generator 8 is connected to the solution inlet of the absorber 5.

Preferably, the heat exchanger is connected with the absorber 5, so that the cooling liquid is communicated with the absorber 5 through the heat exchanger to realize heat exchange.

Preferably, the device further comprises an accumulator 9, a steam outlet of the generator 8 is connected with an inlet of the accumulator 9, an outlet of the accumulator 9 is connected with the secondary evaporation generator 818, and the generation temperature of the secondary evaporation generator 818 is lower than that of the generator 8.

Preferably, the generator 8 is connected to the discharge end of the compression system.

Preferably, the generator 8 is provided with a plurality of chambers, each chamber is provided with a steam cavity, and a steam outlet of the steam cavity of the chamber is connected with a corresponding place needing heat; a passage is arranged between the bins so as to enable the cooling solution to flow between the bins;

and a solution outlet of the chamber at the last stage is connected with a solution mixer, the solution mixer is also provided with a solution inlet and is connected with a solution outlet of the absorber 5 or a solution outlet of the absorber 5 at any stage, and a solution outlet of the solution mixer is connected with a solution inlet of the absorber 5.

Preferably, the generator 8 is a single-effect or multi-effect evaporation system.

Preferably, the single-effect or multi-effect evaporation system is connected with an absorption refrigeration system, the steam source 1 is connected with a steam cavity of a generator 8 of the absorption refrigeration system, or the steam source 1 is connected with a cooling system of the absorption refrigeration system; the solution in the absorption refrigeration system generator 8 is connected with the condenser 4, or any one-stage steam generator 82 and any one-stage absorber 6 of the system in sequence through the heat exchanger.

Preferably, the absorption refrigeration systems are overlapped, the evaporator of the first-stage refrigeration system, or the refrigerant in the evaporator is connected with the solution in the absorber 5 of the next stage, and the refrigerant of the next-stage absorption refrigeration system is the solution with the concentration not being 0.

In this embodiment, the properties of such solutions are utilized. The solution absorbs the vapor, and the energy of the vapor is transferred to the solution. Cooling water is used to carry away part of the absorbed heat, and the temperature of the cooling water rises, so that the vapor pressure of the cooling water also rises. Then the steam of the cooling water is transferred to the solution, the solution is transferred to the cooling water at the raised temperature, the water rises and rises mutually, finally the solution is heated and evaporated by a high-temperature heat source in the generator 8, the absorbed water is evaporated, then the solution is concentrated into the solution with the initial concentration, and the next circulation is started again.

Thus, the low-temperature heat source with extremely low temperature is converted into the heat source with higher temperature. According to the method, the existing absorption refrigeration method can be solved, a large amount of heat is dispersed to the environment through cooling water, and the heat energy is raised to a higher temperature.

The scheme also provides a method for increasing the temperature of the low-temperature heat source based on the device for increasing the temperature of the low-temperature heat source, which comprises the following steps:

firstly, a solution with a certain concentration is needed, and steam containing solution components is obtained by enabling the solution to exchange heat with a certain heat source.

The solution used in this system is called working solution, which enters the absorber 5, the vapor chamber of the absorber 5 being connected to the vapor source 1, the working solution absorbing the vapor.

The solution containing the solution components enters the absorber 5 as a cooling liquid of the cooling system.

The coolant, which has absorbed the heat of absorption, enters the primary steam generator 82; meanwhile, the working solution absorbing the vapor in the absorber 5 enters the primary absorber 6.

The steam generated by the cooling solution entering the primary steam generator 82 enters the steam chamber of the primary steam generator 82 and is absorbed by the working solution in the primary absorber 6 through the connected steam chamber of the primary absorber 6. The working solution further absorbs the vapor from the cooled solution in the primary absorber 6.

The cooling solution exiting the primary steam generator 82 enters the primary absorber 6 and absorbs the heat of absorption generated by the heat exchanger, and the temperature of the cooling solution is further increased.

In the same manner, the cooling solution enters the n-stage steam generator 83, and the generated steam is sent to the n-stage absorber 7 to be absorbed by the working solution.

The working solution enters the generator 8, is heated by a high-temperature heat source in the generator 8, the generated steam enters the condenser 4 for condensation, and the concentrated solution enters the absorber 5 for recycling.

Further, the outlet of the generator 8 is connected to an accumulator 9, and the steam outlet of the accumulator 9 is connected to a secondary evaporation generator 818. The steam in the accumulator 9 is used for heating the working solution in the secondary evaporation generator 818, and the generated steam enters the condenser 4; the concentrated solution enters the absorber 5. At this time, the heating of the external high-temperature heat source inside and outside the generator 8 is stopped, and the solution in the secondary evaporation generator 818 is heated and concentrated by the heat in the accumulator 9, and the generation temperature of the secondary evaporation generator 818 is lower than the generation temperature of the generator 8.

Further, a high-temperature heat source of the generator 8 is connected to the exhaust end of the compression system, and the solution is concentrated by using the temperature of the exhaust end.

Further, the steam pressure is reduced after concentration, and the lower steam pressure is increased to the higher pressure by the compressor unit and then output.

As the solution is concentrated, the vapor pressure of the solution decreases, the pressing force in the generator 8 varies, and the vapor pressure varies among the chambers. The steam outlets of different bins respectively correspond to different temperature requirements, and steam exchanges heat with the condenser 4, or a certain-stage steam generator 8, or a certain-stage absorber 5 for condensation. In the last chamber, the solution is over-concentrated, the concentrated solution enters a solution mixer to be mixed with the solution from the absorber 5 or the first-stage absorber 6 or the outlet of the certain-stage absorber 5 to be prepared into the required concentration, and then the mixed solution enters the solution inlet of the absorber 5 to be circulated again.

The solution concentration can adopt a conventional multi-effect evaporation mode.

Further, the system is stacked with an absorption refrigeration system. When the solution of the absorption refrigeration system has the same composition as the working solution, the steam source 1 is the generator 8 of the refrigeration system. When different solutions are used, the steam source 1 is the steam evaporated by heating in the cooling water system of the absorption refrigeration system. The generator 8 of the absorption refrigeration system is connected to the condenser 4 of the device for raising the temperature of the low-temperature heat source by absorbing the vapor with the solution, or the steam generator 8 of a certain stage, or the absorber 5 of a certain stage, and the solution of the refrigeration system is concentrated by using the heat of absorption of the system.

Further, the absorption refrigeration system is a multi-stage refrigeration system. The refrigerant in the evaporator of the first stage refrigeration system is connected with the solution in the absorber 5 of the secondary absorption refrigeration system, so that the temperature of the solution in the secondary system is reduced, and the purpose of reducing the vapor pressure of the solution is achieved. And then, refrigerant solution (with the components of 0-100%) of the secondary refrigeration system enters an evaporator of the secondary refrigeration system, and evaporated steam enters an absorber 5 of the secondary refrigeration system and is absorbed by the solution in the absorber 5. By this means, lower refrigeration temperatures can be achieved. The solution of the refrigerating system enters a generator 8, exchanges heat with a condenser 4 or a certain level of steam generator 82 and a certain level of absorber 6 in a device for increasing the temperature of a low-temperature heat source in a mode of absorbing steam by the solution, and is subjected to refrigerating circulation again after being concentrated.

The following is further illustrated by some application examples.

In example 1, a large amount of water vapor is required to be condensed in a steam condenser of a steam turbine of a power plant, the last effect of seawater desalination is that the water vapor can not be evaporated, only a small amount of heat can be used for preheating newly inflowing seawater, and most of the residual heat can only be scattered in the environment for condensation.

At the moment, the lithium bromide solution is used for absorbing water vapor and absorbing heat of the water vapor, and then the water vapor is evaporated by means of an external heat source and is conveyed to a place needing to be used, or the air cooling is carried out to save the loss of cooling water.

The lithium bromide solution is fed to an absorber 5 which absorbs water vapour from the steam source 1. After the water vapor is absorbed, the temperature rises due to the heat of absorption. The cooling water is fed to the absorber 5, and the cooling water passes through the heat exchanger, and the absorption part absorbs heat, and the temperature of the cooling water is also raised. The cooling water may be a low-concentration lithium bromide solution instead of pure water.

The cooling water flows out of the absorber 5 and then enters the primary steam generator 82; the lithium bromide solution in the absorber 5 flows out of the absorber 5 and then enters the primary absorber 6. The steam chamber in the primary steam generator 82 communicates with the steam chamber in the primary absorber 6. Therefore, water vapor generated from the cooling water in the primary steam generator 82 enters the vapor chamber in the primary absorber 6 and is absorbed by the lithium bromide solution therein.

After further absorbing the water vapor generated by the cooling water, the concentration of the solution is further reduced and the temperature is further increased. At the same time, the cooling water enters the first-stage absorber 6, and the absorption part absorbs heat, so that the temperature of the solution and the cooling water is raised to a higher temperature.

The cooling water then enters the next stage steam generator 82 and the solution enters the next stage absorber 6. The water vapor generated by the cooling water enters the next-stage absorber 6 again and is absorbed by the solution in the next-stage absorber 6. At the same time, the cooling water also enters the next-stage absorber 6, and absorbs heat by the heat exchanger absorbing part, so that the temperature of the solution and the cooling water is raised to a higher temperature until the n-stage steam generator 83 and the n-stage absorber 7.

The solution then exits the n-stage absorber 7 and enters the generator 8. In the generator 8, an external heat source heats the solution to enable the solution to generate water vapor, the water vapor enters the condenser 4 to be condensed, and the concentrated solution returns to the absorber 5 again.

According to the temperature of a heat source on site, a power plant can adopt higher generation temperature, and seawater desalination only generally utilizes steam at about 80 ℃. The power plant may use the extracted steam, or the steam generated by the economizer, as the heat source for the generator 8 to obtain steam at a higher temperature. This steam can preheat the power generation water in the condenser 4; the steam can not enter the condenser 4, and the steam generated in the generator 8 is compressed by a compressor or is pressurized by a steam jet pump to provide steam for users, so that the thermal power plant can also provide steam resources for the users like a thermal power plant. The compressor is a water vapor compressor and can directly increase the water vapor pressure.

The steam generated in the generator 8 can also be used as a heat source of low boiling point working medium, the low boiling point working medium generator generates electricity, and the generated electricity can be used for electrolyzing water to produce hydrogen.

Further, after the solution flows out of the n-stage absorber 7, the solution may not directly enter the generator 8, but may be heat-exchanged with newly inflowing seawater or cold water of a power plant. Then enters the absorber 5 or the primary absorber 6 again to absorb water vapor, further reduces the concentration of the solution, and then enters the generator 8 for concentration. The lower the concentration of the solution, the higher the vapor pressure generated after the occurrence, and the higher the value of the secondary vapor.

Further, the generator 8 is divided into several chambers. Each chamber has a liquid conduit leading to a next chamber. The steam cavity outlet of the bin corresponds to each different application. If multi-effect distillation is adopted, the part of steam is led to the next-stage generator 8 through an outlet; or to locations where a heat load is required.

The process of finally obtaining water adopts the existing mature processes of multistage flash evaporation, multi-effect distillation and the like, and is not further explained here.

Further, the cooling water does not flow all the way from the absorber 5 to the n-stage absorber 7. The heat exchanger is connected with the absorber 5 to absorb the heat by adopting a mode of heating water by a boiler. The cooling water absorbing the heat is heated and then enters the steam cavity through the ascending pipe, and then the steam and the liquid are separated. The separated steam enters a steam cavity of the next-stage absorber 6 communicated with the steam cavity and is absorbed by the solution in the next-stage absorber 6; and the cooling water flows back to the heat exchanger in the absorber 5 through the downcomer, absorbs the heat again, and then enters the riser again for recycling.

Further, if the temperature of the external heat source is high enough, the solution may be further concentrated above the desired concentration. The concentrated solution is then passed to a solution mixer. The solution mixer also has a solution inlet connected to the solution outlet of the absorber 5, or the solution outlet of the first-stage absorber 6, or the solution outlet of the absorber 5 of a certain stage.

Thus, the high-concentration solution and the low-concentration solution are mixed together in a mixer to be adjusted to a desired concentration, and then circulated in the absorber 5.

Example 2, the system according to the embodiment of the present invention is overlapped with an absorption refrigeration system, and when the refrigeration system is the same as the working medium used in the system according to the present invention, the two systems may be directly connected to exchange heat with the working medium. If the working media are different, the system of the invention can exchange heat with the working media with a cooling water system of an absorption refrigeration system, and is connected with other parts through a heat exchanger, and only exchanges heat. For example, when the lithium bromide solution is connected with the ammonia absorption refrigeration system, only the steam of the cooling water of the ammonia refrigeration system is absorbed, and only heat exchange is carried out with other parts without working medium exchange.

The refrigeration system is the same as the existing absorption refrigeration system, except that the generator 8 is connected with a certain stage of steam generator 82, a certain stage of absorber 6 or condenser 4 of the system, and the solution is heated by using the heat of absorption or condensation to promote the evaporation of the solution. The solution can be concentrated step by step until the solution is concentrated to the required concentration; or by this method, the solution is concentrated to a certain degree and then enters the generator 8, and the remaining solution is concentrated to the required concentration by means of an external heat source. The system of the invention can absorb the heat taken away by part of the cooling water of the refrigeration system, and convert the heat into higher temperature for preheating the ammonia water solution and even evaporating the ammonia water, so that the concentration of the ammonia water is firstly improved, the loss of the final external solution is reduced, and the energy is saved.

The following are all described by taking a lithium bromide solution as an example:

in the prior art, the lithium bromide solution concentration of the refrigeration system varies from 62% to 58% within the absorber 5.

The concentration of the system of the present invention changes from 50% to about 47% in the absorber 5. Then enters each absorber 5, and continues to absorb the vapor until entering the generator 8. When a 50% lithium bromide solution is heated at 100 ℃, 2 effects can be achieved; when heating at 150 ℃, 3-effect distillation can be realized. While the 62 percent lithium bromide solution can only achieve 1 effect when heated at 100 ℃; when heating at 150 deg.C, 2 effects can be achieved.

The refrigeration system uses a solution of conventional concentration, and the system of the present invention uses a solution of 50% concentration.

The water vapor generated in the generator 8 of the refrigeration system enters the vapor cavity of the absorber 5 of the system of the invention communicated with the vapor cavity through the vapor cavity and is absorbed by the solution in the absorber 5.

The solution in the absorber 5, which has absorbed the vapor from the refrigeration system generator 8, then enters the primary absorber 6, where it continues to absorb the vapor from the primary vapor generator 82, which is the vaporized cooling water.

The solution enters an n-stage absorber 7, absorbs steam from an n-stage steam generator 8 and then enters the generator 8. The steam generated by the generator 8 is passed to the condenser 4 or used for other purposes. The concentrated solution enters the absorber 5 and is recycled again.

Wherein, the condenser 4, or a certain grade of steam generator 8, or a certain grade of absorber 5 is connected with the generator 8 of the absorption refrigeration system, transfers heat to the solution in the generator 8 of the refrigeration system, and the solution returns to the absorber 5 of the refrigeration system again after being concentrated to the required concentration, and then is circulated again.

Example 2 compared with example 1, the system of the present embodiment adds an absorption refrigeration system, and thus, not only can the low-temperature heat source temperature be raised to a higher temperature, but also the cooling capacity can be obtained.

Further, the absorption refrigeration system is a multi-stage system. The multi-stage refrigeration system can be a conventional multi-stage system or a multi-stage system for transferring to low temperature.

The refrigeration system, the generator 8 of the primary refrigeration system, is connected to the absorber 5 of the system of the present invention. The generator 8 of the primary refrigeration system is connected to the condenser 4 of the system according to the invention, or to the steam generator 8 of a certain stage, or to the absorber 5 of a certain stage. The evaporator of the secondary refrigeration system is connected with the absorber 5 of the secondary refrigeration system and cooling water, and the refrigerant of the secondary refrigeration system is lithium bromide solution.

The primary refrigeration system uses a conventional concentration of 62%, the secondary refrigeration system uses a solution of 55%, and the refrigerant of the secondary refrigeration system uses a lithium bromide solution of 30%.

Referring to fig. 6, the secondary refrigeration system includes: a secondary refrigeration system generator 21, a secondary refrigeration system absorber 210, and a secondary refrigeration system evaporator 29.

The primary refrigeration system adopts the prior art and can obtain cold water with the temperature of 7 ℃. The cold water of 7 ℃ exchanges heat with the solution in the secondary refrigeration system absorber 210, and the temperature of 55% solution of the secondary refrigeration system is reduced to about 12 ℃. At this time, the pressure of the 55% lithium bromide solution is about 0.23kp, the 30% refrigerant lithium bromide solution is evaporated in the evaporator 29 of the secondary refrigeration system, and the generated water vapor enters the absorber 5 of the secondary system and is absorbed by the 55% lithium bromide solution. When the pressure of the 30% lithium bromide solution is reduced to about 0.3kp, the temperature of the solution is about-5 ℃.

In this way, low temperatures below 0 degrees can be generated by the lithium bromide refrigeration system, while low temperatures below 0 degrees can be generated by the lithium bromide refrigerator.

The scheme can be applied in some scenes, for example: a power plant.

It is generally applied to a cooling water system to reduce water and heat consumption of a cooling tower while supplying hot water or steam at a certain temperature. The device can be applied to centralized heating in winter, can directly produce 120-degree hot water, does not need to extract steam from a steam turbine, and is used for heating hot water. The existing lithium bromide heat pump technology can only produce hot water at about 90 degrees, and finally, the hot water is heated to 120 degrees by steam extraction.

The existing central heating backwater is generally 50 degrees. By adopting the technical scheme of the invention, the return water temperature of heating can be reduced to about 10 ℃. The existing lithium bromide refrigeration system can obtain cold water with the temperature of about 7 ℃. The system of the invention reduces the hot water for heating the primary network from 50 degrees to about 10 degrees and transfers the heat to the generator 8. Steam is generated to heat the solution in the generator 8 by means of an existing district heating boiler. Steam generated by heating the solution in the generator 8 exchanges heat with the heating return water of the secondary net for condensation, and simultaneously heats the heating return water of the secondary net.

In areas where there is no boiler room and where there is a particular abundance of electricity, a compressor unit may be provided. For example, a water vapor compressor pumps steam in the generator 8, and then the compressed high-pressure steam is sent back to the generator 8 and exchanges heat with the solution in the generator 8 through a heat exchanger. Liquid water after high-pressure steam condensation exchanges heat with return water of the heating secondary network; the latent heat of condensation of the high pressure steam causes the solution in the generator 8 to continue to evaporate. Or a compressor adopting other refrigerants such as CO2 and the like is adopted, the exhaust end of the compressor is connected with the generator 8, the solution in the generator 8 is heated by utilizing the exhaust temperature, the steam generated by evaporation is subjected to heat exchange with the heating return water of the secondary network.

The scheme can also be applied in other scenes, such as: and (4) desalting seawater.

The method can simultaneously produce and deliver cold, heat and water, and can also be used for air conditioning of buildings and the like, and the generated heat can be delivered to heat utilization places such as dining halls of the buildings and the like.

Example 3, for pure air conditioning refrigeration, there is essentially no thermal load.

The working procedure of this example is the same as example 2.

At the steam outlet of the generator 8, an accumulator 9 is arranged. When the energy accumulator 9 meets certain requirements, the external heat source is closed, and the solution in the generator 8 is heated by utilizing the heat stored in the energy accumulator 9. The temperature of the accumulator 9 is lowered and the external heat source is started again.

Further, if the temperature of the external heat source is high enough, a secondary evaporation generator 818 is provided. The secondary evaporation generator 818 generates a temperature lower than that of the generator 8. Accumulator 9 heats the solution in secondary evaporation generator 818, concentrating the solution.

Example 4, dehumidifier.

In the present embodiment, air is made to flow through the absorber 5, and water vapor in the air is absorbed by the lithium bromide solution in the absorber 5. The cooling water introduced into the absorber 5 is heated, and the generated steam enters the primary absorber 6 and is absorbed by the lithium bromide solution in the primary absorber 6. Finally, the lithium bromide solution flows out of the n and the absorber 5 and enters the generator 8. Heated by an external heat source in the generator 8, and then flows out of the generator 8 into the absorber 5 after the original concentration is recovered, and the circulation is performed again.

Example 5, air conditioning for high humidity area, while reducing the effect of offsetting the heat load by cooling and securing humidity. Such as: textile workshops or high-temperature and high-humidity test boxes.

According to the conventional refrigeration method, water vapor in the air is also condensed, and a large amount of refrigeration power is consumed due to the large latent heat of the water vapor. The treated air is then humidified, typically by heating the water to evaporate the water.

According to the technical scheme of the invention, the influence of water vapor in the air on the refrigerating system can be reduced to the maximum extent. Through the lithium bromide solution, absorb the vapor in the air, then refrigerating system gives dry air cooling, then in the lithium bromide solution, the vapor of evaporating out sends back the air after the processing, satisfies the requirement of temperature and humidity.

When no waste heat resources exist on site, compressor refrigeration plus the dehumidification method of example 4 are adopted.

Air is first allowed to flow through the absorber 5, and water vapor in the air is absorbed by the solution in the absorber 5. The dry air flowing out of the absorber 5 flows through an evaporator of the mechanical refrigeration system to exchange heat with the evaporator for cooling.

The lithium bromide solution exits the absorber 5 and enters the primary absorber 6. Absorbs the vapor of the cooling water in the absorber 5, and then enters the next-stage absorber 6.

Preferably, the mechanical compressor set is a CO2 compressor, or a low-pressure compressor and a high-pressure compressor of R134A, and the compressor set is connected in series, and the exhaust end of the compressor is connected with the solution generator 8.

Since the discharge temperature of the compressor train is not so high, the number of stages of the absorber 5 is not large. The solution enters the generator 8, exchanges heat with the high-temperature and high-pressure refrigerant discharged by the compressor, is concentrated and then returns to the absorber 5.

The evaporated water vapor is connected with the air flowing through the evaporator of the refrigerating system, so that the humidity of the air is recovered.

Preferably, the discharge end of the compressor is connected to the cooling water flowing out of the n-stage absorber 7, and the solution in the generator 8 is heated by the steam generated after the cooling water is heated.

When the residual heat is available on site, the lithium bromide absorption refrigeration mode is adopted for refrigeration, such as example 2.

Because lithium bromide needs to maintain high vacuum degree for refrigeration, the solution absorbing water vapor is completely isolated from the refrigeration system, and only heat exchange is performed without exchanging working medium.

As with mechanical refrigeration, the air to be treated flows into the absorber 5 of the dehumidification system. The lithium bromide solution in the absorber 5 absorbs the water vapor in the air and flows into the primary absorber 6. The steam from the primary steam generator 82 is absorbed in the primary absorber 6 and then enters the generator 8 of the dehumidification system. The generator 8 of the dehumidification system exchanges heat with a certain stage of steam generator 82, a certain stage of absorber 6, or a condenser 4 of the system according to the invention. The evaporated water vapour is combined with dry air cooled by a refrigeration system to a desired temperature and humidity.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

1. A device for increasing the temperature of a low-temperature heat source is characterized by comprising a steam source, an absorber connected with the steam source, a primary steam generator, a primary absorber, a secondary evaporation generator, a secondary absorber, an n-stage steam generator, an n-stage absorber, a generator and a condenser, wherein n is more than or equal to 1;

the cooling liquid system is sequentially connected with the absorber, the first-stage steam generator, the first-stage absorber, the second-stage evaporation generator, the second-stage absorber, the n-stage steam generator and the n-stage absorber, and the cooling liquid system contains a solution with the same components as the working solution.

2. The apparatus of claim 1, wherein the source of steam is in communication with a steam chamber of the absorber, the primary steam generator is in communication with a steam chamber of the primary absorber, and a solution outlet of the absorber is connected to a solution inlet of the primary absorber; the solution outlet of the primary absorber is connected with the solution inlet of the secondary absorber; the solution outlet of the secondary absorber is connected with the solution inlet of the n-stage absorber; the solution outlet of the n-stage absorber is connected with the solution inlet of the generator; the solution outlet of the generator is connected with the solution inlet of the absorber.

3. An apparatus for elevating the temperature of a cryogenic heat source as claimed in claim 1 further comprising a heat exchanger coupled to the absorber such that the cooling liquid communicates with the absorber through the heat exchanger to effect heat exchange.

4. An apparatus for elevating the temperature of a cryogenic heat source as claimed in claim 3 further comprising an accumulator, the steam outlet of said generator being connected to the inlet of said accumulator, the outlet of said accumulator being connected to said secondary evaporation generator, the temperature of said secondary evaporation generator being lower than the temperature of said generator.

5. An apparatus for elevating the temperature of a cryogenic heat source as claimed in claim 4 wherein the generator is connected to the exhaust of the compression system.

6. The apparatus as claimed in claim 3, wherein the generator has a plurality of chambers, each chamber having a steam chamber, and the steam outlets of the steam chambers of the chambers are connected to the corresponding places where heat is needed; a passage is arranged between the bins so as to enable the cooling solution to flow between the bins;

7. An apparatus for elevating the temperature of a cryogenic heat source as claimed in claim 6 wherein the generator is a single effect or multiple effect evaporation system.

8. The apparatus for increasing the temperature of a cryogenic heat source of claim 7 wherein the single or multiple effect evaporation system is coupled to an absorption refrigeration system, the source of vapor is coupled to a generator vapor chamber of the absorption refrigeration system, or the source of vapor is coupled to a cooling system of the absorption refrigeration system; and the solution in the absorption refrigeration system generator is sequentially connected with a condenser of the system, or any one-stage steam generator and any one-stage absorber through the heat exchanger.

9. The apparatus for elevating the temperature of a low temperature heat source as claimed in claim 8, wherein the absorption refrigeration systems are stacked, the evaporator of the one-stage refrigeration system, or the refrigerant in the evaporator is connected to the solution in the absorber of the next-stage absorption refrigeration system, and the refrigerant of the next-stage absorption refrigeration system is the solution having a concentration of not 0.

10. The use method of the device for increasing the temperature of the low-temperature heat source is characterized by comprising the following steps:

passing the cooling liquid into an absorber;

the cooling solution entering the primary steam generator is heated due to the absorption of the solution to absorb the heat of the steam, the temperature of the cooling solution rises, the generated steam enters the steam cavity of the primary steam generator to be absorbed by the solution in the primary absorber, and the working solution further absorbs the steam from the cooling solution in the primary absorber;

the working solution enters a generator, is heated by a high-temperature heat source in the generator, and the generated steam is conveyed to a place needing heat or enters a condenser for condensation, and the solution which is concentrated and then recovered to the initial concentration enters an absorber for recycling;

or the condenser is connected with the required places of various purposes, and the steam generated at high temperature can be stored and used as the heat source of the generator at lower temperature; even if the heat is radiated to the environment, the heat can be radiated in a sensible heat mode with higher temperature, and the existing steam evaporation mode is replaced.