CN113418320B

CN113418320B - Device for raising low-temperature heat source temperature and application method thereof

Info

Publication number: CN113418320B
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: 2023-07-28
Anticipated expiration: 2041-06-16
Also published as: CN113418320A

Abstract

The invention discloses a device for improving the temperature of a low-temperature heat source and a use method thereof, wherein the device comprises a steam source, a first absorber connected with the steam source, a first-stage steam generator, a first-stage absorber, a second-stage steam generator, a second-stage absorber, an n-stage steam generator, an n-stage absorber, a generator and a condenser, wherein n is more than or equal to 2; the cooling liquid system is sequentially connected with the first absorber, the first-stage steam generator, the first-stage absorber, the second-stage steam generator, the second-stage absorber, the n-stage steam generator and the n-stage absorber, and the cooling liquid system contains cooling solution with the same components as the working solution. The device for raising the temperature of the low-temperature heat source converts the low-temperature heat source with extremely low temperature into a heat source with higher temperature. To solve the problems of the prior absorption refrigeration mode, a great deal of heat is dispersed to the environment through cooling water, and the heat energy is raised to a higher temperature.

Description

Device for raising low-temperature heat source temperature and application method thereof

Technical Field

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

Background

Currently, in industrial processes, a large amount of low temperature heat sources, especially slightly higher than normal temperature, are often generated. 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 evaporates in the environment, so that a large amount of water resources are consumed, and the humidity of the small environment is increased.

In addition, a large amount of low-temperature waste heat of 100 ℃ and more than 200 ℃ is used for waiting. And a great amount of hot water with low temperature such as domestic water is required.

The current method is to utilize low boiling point working medium and utilize these low temperature waste heat to generate electricity. Or the lithium bromide absorption refrigeration/heat pump is used for generating low-temperature hot water for different working procedures while obtaining the refrigeration capacity.

The existing lithium bromide absorption refrigeration/heat pump is not high in energy efficiency ratio, 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 the corrosiveness is increased due to the property of the lithium bromide solution and the overhigh temperature, so that the prior art only can realize double effects.

The highest temperature hot water generated by the lithium bromide absorption heat pump reaches about 90 degrees. The temperature at which the lithium bromide solution generates the secondary vapor 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 the refrigeration. The existing two-stage lithium bromide refrigeration/heat pump adopts the existing lithium bromide absorption refrigeration/heat pump mode, so that the energy efficiency ratio is limited.

In the aspect of sea water desalination, distilled water is obtained by utilizing low-temperature steam of a power plant through a multi-effect evaporation mode. When the last effect heats the seawater, the generated secondary steam cannot evaporate the seawater any more due to the low temperature, and only the seawater can be condensed by the environment, so that a great amount of latent heat is wasted.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a device for improving the temperature of a low-temperature heat source, which converts an extremely low-temperature heat source into a heat source with higher temperature. To solve the problems of the prior absorption refrigeration mode, a great deal of heat is dispersed to the environment through cooling water, and the heat energy is raised to a higher temperature.

The technical aim of the invention is realized by the following technical scheme: the device for improving the temperature of the low-temperature heat source comprises a steam source, a first absorber, a first-stage steam generator, a first-stage absorber, a second-stage steam generator, a second-stage absorber, an n-stage steam generator, an n-stage absorber, a generator and a condenser, wherein the first absorber, the first-stage steam generator, the first-stage absorber, the second-stage steam generator, the second-stage absorber, the n-stage steam generator, the n-stage absorber, the generator and the condenser are connected with the steam source, and n is more than or equal to 2; the steam source is the steam generated after absorbing the heat of the low-temperature heat source.

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

Preferably, the steam source is communicated with the steam cavity of the first absorber, the primary steam generator is communicated with the steam cavity of the primary absorber, and the solution outlet of the first absorber is connected with the 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 generator is connected with the solution inlet of the first absorber.

Preferably, the cooling system further comprises a first heat exchanger connected with the first absorber so that the cooling solution is communicated with the first absorber through the first heat exchanger to realize heat exchange.

Preferably, the device for raising the temperature of the low-temperature heat source further comprises:

providing a working solution with a certain concentration and steam containing components of the working solution;

allowing the working solution to enter a first absorber, and absorbing steam by the working solution;

passing the cooling solution into a first absorber;

the temperature of the cooling solution is increased due to the absorption heat of the working solution absorbed by the steam, and then the cooling solution enters the primary steam generator; simultaneously, the working solution which absorbs the steam in the first absorber enters the first absorber;

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

enabling the cooling solution flowing out of the primary steam generator to enter the primary absorber, absorbing the generated absorption heat through the primary heat exchanger, and further increasing the temperature of the cooling solution;

then the cooling solution enters an n-level steam generator, and the generated steam is sent into an n-level absorber and absorbed by the working solution;

then the working solution enters a generator, the working solution is heated by a high-temperature heat source in the generator, the generated steam is conveyed to a place needing heat, or enters a condenser to be condensed, the working solution is recovered to the original concentration after being concentrated, and the working solution enters a first absorber to be recycled.

Preferably, the steam generator further comprises an energy accumulator, a steam outlet of the generator is connected with an inlet of the energy accumulator, an outlet of the energy accumulator is connected with the secondary steam generator, and the generation temperature of the secondary steam 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 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 provided between the chambers to allow the working solution to flow between the chambers;

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

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

Preferably, the single-effect or multiple-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.

The invention also provides a use method of the device for improving the low-temperature heat source temperature, which is used for the device for improving the low-temperature heat source temperature.

In summary, the invention has the following beneficial effects:

the device for improving the temperature of the low-temperature heat source comprises a steam source, a first absorber, a first-stage steam generator, a first-stage absorber, a second-stage steam generator, a second-stage absorber, an n-stage steam generator, an n-stage absorber, a generator and a condenser, wherein the first absorber, the first-stage steam generator, the first-stage absorber, the second-stage steam generator, the second-stage absorber, the n-stage steam generator, the n-stage absorber, the generator and the condenser are connected with the steam source, and n is more than or equal to 2; the cooling liquid system is sequentially connected with the first absorber, the first-stage steam generator, the first-stage absorber, the second-stage steam generator, the second-stage absorber, the n-stage steam generator and the n-stage absorber, and the cooling liquid system contains a cooling solution with the same component as the working solution.

In this scheme, the properties of such solutions are exploited. The working solution absorbs the steam, and the energy of the steam is transferred to the cooling solution. The cooling solution is used to carry away part of the absorbed heat, while the cooling solution temperature is increased and the vapor pressure of the cooling solution is also increased. Then the steam of the cooling solution is transferred to the working solution, the working solution transfers the elevated temperature to the cooling solution, the ship rises and rises mutually, finally the working solution is heated and evaporated by a high-temperature heat source in the generator, the absorbed water is evaporated, then the concentrated working solution is started to circulate next time.

Thereby, the low temperature heat source with extremely low temperature is converted into the heat source with higher temperature. To solve the problems of the prior absorption refrigeration method, a great deal of heat is dispersed to the environment through a cooling solution, and the heat energy is raised 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 that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of an embodiment of a device for raising the temperature of a low temperature heat source according to the present invention;

FIG. 2 is a schematic view of an embodiment of a device for raising the temperature of a low temperature heat source according to the present invention;

FIG. 3 is a schematic view of an embodiment of a device for raising the temperature of a low temperature heat source according to the present invention;

FIG. 4 is a schematic view of an embodiment of a device for raising the temperature of a low temperature heat source according to the present invention;

FIG. 5 is a schematic view of an embodiment of a device for raising the temperature of a low temperature heat source according to the present invention;

FIG. 6 is a schematic diagram of an embodiment of a device for raising 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. a first absorber; 6. a primary absorber; 7. an n-stage absorber; 8. a generator; 9. an accumulator; 81. a secondary steam generator; 21. a secondary refrigeration system generator; 210. a secondary refrigeration system absorber; 29. a two-stage refrigeration system evaporator.

Description of the embodiments

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

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

Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is 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 at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The invention provides a device for raising the temperature of a low-temperature heat source, which converts an extremely low-temperature heat source into a heat source with higher temperature. To solve the problems of the prior absorption refrigeration mode, a great deal of heat is dispersed to the environment through cooling water, and the heat energy is raised to a higher temperature.

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

The structure of the device for increasing the temperature of the low-temperature heat source is specifically described below, and the device for increasing the temperature of the low-temperature heat source comprises:

the system comprises a steam source 1, a first absorber 5, a first-stage steam generator 82, a first-stage absorber 6, a second-stage steam generator 81, a second-stage absorber, an n-stage steam generator 83, an n-stage absorber 7, a generator 8 and a condenser 4, wherein the first absorber 5, the first-stage steam generator 82, the first-stage absorber 6, the second-stage steam generator 83, the n-stage absorber 7 and the condenser 4 are connected with the steam source 1, and n is more than or equal to 2;

the cooling liquid system is sequentially connected with the first absorber 5, the primary steam generator 82, the primary absorber 6, the secondary steam generator 81, the secondary absorber, the n-stage steam generator 83 and the n-stage absorber 7, and the cooling liquid system contains a cooling solution with the same component as the working solution.

Preferably, the steam source 1 is in communication with the steam cavity of the first absorber 5, the primary steam generator 82 is in communication with the steam cavity of the primary absorber 6, and the solution outlet of the first absorber 5 is connected with the 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 generator 8 is connected to the solution inlet of the first absorber 5.

Preferably, a first heat exchanger is further included, which is connected to the first absorber 5, so that the cooling solution is communicated with the first absorber 5 through the first heat exchanger to realize heat exchange.

the working solution is made to enter the first absorber 5, and the working solution absorbs the vapor;

passing the cooling solution into a first absorber 5;

as the heat of absorption of the working solution absorbed vapor is absorbed, the temperature of the cooling solution increases, and then the cooling solution is introduced into the primary steam generator 82; the working solution which absorbs the steam in the first absorber 5 enters the first absorber 6;

the cooling solution entering the primary steam generator 82, the generated steam, and the steam cavity entering the primary absorber 6 to be absorbed by the working solution in the primary absorber 6, the working solution further absorbing the steam from the cooling solution in the primary absorber 6;

the cooling solution flowing out of the primary steam generator 82 is made to enter the primary absorber 6, and the generated absorption heat is absorbed by the primary heat exchanger, and the temperature of the cooling solution is further raised;

then, the cooling solution enters an n-stage steam generator 81, and the generated steam is sent into an n-stage absorber 7 to be absorbed by the working solution;

the working solution is then fed into the generator 8, heated by a high temperature heat source in the generator 8, and the generated steam is fed to a place where heat is required, or condensed in the condenser 4, and the concentrated working solution is returned to the original concentration, and is fed into the first absorber 5 for recirculation.

Preferably, the steam generator 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 steam generator 81, and the generation temperature of the secondary steam generator 81 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 has 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 provided between the chambers to allow the working solution to flow between the chambers;

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

Preferably, the generator 8 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 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.

In this scheme, the properties of such solutions are exploited. The working solution absorbs the steam, and the energy of the steam is transferred to the cooling solution. The cooling solution is used to carry away part of the absorbed heat, and at the same time the temperature of the cooling solution increases, so does the vapor pressure of the cooling solution. Then the steam of the cooling solution is transferred to the working solution, the working solution is transferred to the cooling solution at the elevated temperature, the working solution is heated and evaporated by a high temperature heat source in the generator 8, the absorbed water is evaporated, and then the working solution is concentrated into the working solution with the initial concentration, and then the next circulation is started.

Thereby, the low temperature heat source with extremely low temperature is converted into the heat source with higher temperature. According to this method, the existing absorption refrigeration mode can be solved, a great amount of heat is dispersed to the environment through the cooling solution, and the heat energy is raised to a higher temperature.

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

firstly, a working solution with a certain concentration and steam containing components of the working solution are needed, and the steam can be obtained by exchanging heat between the working solution and a certain heat source.

The solution used in this system is called working solution, which enters the first absorber 5, the vapour chamber of the first absorber 5 is connected to the vapour source 1, and the working solution absorbs vapour.

The solution containing the working solution component, as a cooling solution for the cooling system, enters the first absorber 5.

The cooling solution, which absorbs the heat of absorption, enters the primary steam generator 82; the working solution, which absorbs the vapor in the first absorber 5, enters the primary absorber 6.

The steam generated by the cooling solution entering the primary steam generator 82 enters the steam cavity of the primary steam generator 82 and is absorbed by the working solution in the primary absorber 6 through the steam cavities of the primary absorber 6 connected together. The working solution is in the primary absorber 6 further absorbing the vapour from the cooling solution.

The cooling solution flowing out of the primary steam generator 82 enters the primary absorber 6 and absorbs the generated absorption heat by the first heat exchanger, and the temperature of the cooling solution further increases.

In the same way, 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, the working solution is heated by a high-temperature heat source in the generator 8, the generated steam enters the condenser 4 to be condensed, and the concentrated working solution enters the first absorber 5 to be recycled.

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 steam generator 81. The steam in the accumulator 9 is used for heating the working solution in the secondary steam generator 81, and the generated steam enters the condenser 4; the concentrated working solution enters the first absorber 5. At this time, the heating by the external and internal heat sources of the generator 8 is stopped, the working solution in the secondary steam generator 81 is heated and concentrated by the heat in the accumulator 9, and the generation temperature of the secondary steam generator 81 is lower than the generation temperature of the generator 8.

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

Further, the vapor pressure after concentration is reduced, and the lower vapor pressure is raised to the higher pressure by the compressor unit and then outputted.

As the working solution is concentrated, the vapor pressure of the working solution decreases, the pressure in the generator 8 varies, and the working solution is divided into a plurality of chambers, and the vapor pressures of the different chambers vary. The steam outlets of different bins respectively correspond to different temperature requirements, and the steam exchanges heat and condenses with the condenser 4, or a certain level steam generator, or a certain level absorber. In the last chamber, the working solution is excessively concentrated, the concentrated working solution enters a solution mixer, is mixed with the solution from the outlets of the first absorber 5 or the first-stage absorber 6 and the n-stage absorber 7 to be prepared into the required concentration, and then the mixed working solution enters the solution inlet of the first absorber 5 for recirculation.

The working solution concentration can be performed by a conventional multi-effect evaporation mode.

Further, the system overlaps with the absorption refrigeration system. When the solution of the absorption refrigeration system is the same composition as the working solution, the vapor source 1 is the generator 8 of the refrigeration system. When different solutions are used, the source of vapour 1 is the vapour of the absorption refrigeration system in which the cooling solution is heated to evaporate. The generator 8 of the absorption refrigeration system is connected with the condenser 4 of the device for raising the temperature of the low-temperature heat source or the steam generator of a certain stage or the absorber of a certain stage in a mode of absorbing steam by the working solution, and the working solution of the refrigeration system is concentrated by utilizing the absorption heat of the system.

Further, the absorption refrigeration system is a multi-stage refrigeration system. The refrigerant in the evaporator of the first-stage refrigerating system is connected with the solution in the absorber of the secondary absorption refrigerating system, so that the solution temperature of the secondary system is reduced, and the aim of reducing the vapor pressure of the solution is fulfilled. Then the refrigerant solution of the secondary refrigerating system (the component is between 0 and 100 percent) enters an evaporator of the secondary refrigerating system, and the evaporated steam enters an absorber of the secondary refrigerating system and is absorbed by the solution in the absorber. By this means, a lower refrigeration temperature can be obtained. In the device for raising the temperature of the low-temperature heat source by means of the solution absorbing steam, the solution of the refrigerating system enters the generator 8, and the condenser 4 or the steam generator or the absorber of a certain stage exchanges heat, and the refrigerating cycle is performed again after concentration.

Further description will be provided below by way of some examples of application.

In example 1, a large amount of steam in a turbine condenser of a power plant needs to be condensed, the steam in the last effect of sea water desalination can not be evaporated, only a small amount of heat can be used for preheating newly inflowing sea water, and the rest of heat can only be scattered in the environment for condensation.

At the moment, the lithium bromide solution is utilized to absorb the water vapor and heat, and then the water vapor is evaporated by an external heat source and is conveyed to a place where the water vapor needs to be used, or the water vapor is cooled by air to save the loss of cooling water.

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

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

After further absorbing the vapor generated by the cooling solution, the concentration of the working solution is further reduced and the temperature is further increased. At the same time the cooling solution enters the primary absorber 6, where the absorption part absorbs heat, raising the temperature of the working solution and the cooling solution to a higher temperature.

Thereafter, the cooling solution enters the next stage steam generator 82 and the working solution enters the next stage absorber 6. The vapor generated by the cooling solution enters the next absorber 6 again and is absorbed by the working solution in the next absorber 6. At the same time, the cooling solution also enters the next-stage absorber 6, absorbs part of the heat by the first heat exchanger, and increases the temperature of the working solution and the cooling solution to a higher temperature until the n-stage steam generator 3 and the n-stage absorber 7.

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

Depending on the heat source temperature on site, higher generation temperatures may be used in the power plant, while desalination of sea water typically uses only about 80 degrees of steam. The power plant may use steam extraction or steam generated by an economizer as a heat source for the generator 8 to obtain higher temperature steam. These vapors can be in the condenser 4 to preheat the power generation water; the steam can also not enter the condenser 4, and the steam generated in the generator 8 is compressed by the compressor or is provided for users after being boosted by the steam jet pump, so that the thermal power plant can also provide steam resources for users like a thermal power plant. The compressor is a vapor compressor, and can directly raise the vapor pressure.

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

Further, after the working solution flows out of the n-stage absorber 7, it may not directly enter the generator 8 but exchange heat with newly inflowing seawater or cold water of the power plant. Then re-enters the first absorber 5 or the first absorber 6 to absorb the water vapor again, further reduces the concentration of the working solution, and then enters the generator 8 to concentrate. The lower the concentration of the working solution, the higher the vapor pressure generated after concentration by the generator 8, and the higher the utilization value of the secondary vapor.

Further, the generator 8 is divided into several chambers. Each compartment has a liquid conduit leading to the next compartment. The steam cavity outlet of the chamber corresponds to each different application. If a multi-effect distillation mode is adopted, the steam outlet of the part is communicated with the next-stage generator 8; or to a place where a thermal load is required.

The process of obtaining water finally adopts the existing mature multi-stage flash evaporation, multi-effect distillation and other processes, and is not further described herein.

Further, the cooling solution does not flow all the way from the first absorber 5 to the n-stage absorber 7. The first heat exchanger is connected with the first absorber 5 by adopting a mode of heating water by a boiler, and absorbs heat. The cooling solution absorbing heat is heated and then enters the steam cavity through the ascending pipe, and then vapor-liquid separation is carried out. The separated steam enters a steam cavity of the next-stage absorber 6 communicated with the steam cavity and is absorbed by the working solution in the next-stage absorber 6; the cooling solution flows back to the first heat exchanger in the first absorber 5 through the down pipe, absorbs the absorption heat again, and then enters the up pipe again to be circulated again.

Further, if the temperature of the external heat source is high enough, the working solution may be further concentrated to a higher concentration than required. The over-concentrated working solution then enters the solution mixer. The solution mixer also has a solution inlet connected to the solution outlet of the first absorber 5, or the solution outlet of the first absorber 6, or the solution outlet of the n-absorber 7.

Thus, the high-concentration working solution and the low-concentration working solution are mixed together in the mixer, and after being prepared to a desired concentration, the mixture is circulated into the first absorber 5.

Example 2 the system according to the embodiment of the present invention overlaps with the absorption refrigeration system, and when the refrigeration system is identical to the working medium adopted by the system according to the present invention, the two systems can be directly connected to exchange heat with the working medium. If the working media adopted are different, the system disclosed by the invention can exchange heat with the working media and only exchange heat with other parts through a heat exchanger with a cooling water system of an absorption refrigeration system. For example, when the lithium bromide solution is connected with the ammonia absorption refrigeration system, only the vapor of the cooling solution of the ammonia refrigeration system is absorbed, only heat exchange is performed with other parts, and no working medium exchange is performed.

The refrigeration system is the same as the existing absorption refrigeration system, except that the generator 8 is connected with a steam generator, an absorber or a condenser 4 of a certain stage of the system, and the working solution is heated by utilizing absorption heat or condensation heat to promote the evaporation of the working solution. Enabling the working solution to be concentrated step by step until the working solution is concentrated to the required concentration; or by this method, after concentrating the working solution to a certain degree, the working solution enters the generator 8, and the rest working solution is concentrated to a required concentration by means of an external heat source. The system of the invention can absorb the heat taken away by the cooling solution of part of the refrigerating 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 improved, the loss of the final external solution is reduced, and the energy is saved.

The following are all examples using lithium bromide solution:

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

The concentration in the first absorber 5 of the system according to the invention changes from 50% to around 47%. Then enters each stage absorber and continues to absorb steam until entering the generator 8. 50% lithium bromide solution, when heated at 100 ℃, can achieve 2 effects; when heating is carried out at 150 ℃, 3-effect distillation can be achieved. And 62% lithium bromide solution, when heated at 100 ℃, can only achieve 1 effect; when the heating is performed at 150 ℃,2 effects can be achieved.

The refrigerating system adopts working solution with conventional concentration, and the system adopts working solution with 50% concentration.

The water vapor generated in the refrigeration system generator 8 enters the vapor chamber of the first absorber 5 of the system of the present invention in communication therewith through the vapor chamber and is absorbed by the working solution in the first absorber 5.

The working solution in the first absorber 5 absorbs the vapor from the refrigeration system generator 8 and then enters the primary absorber 6, continuing to absorb the vapor from the primary vapor generator 82, which vapor is derived from the vaporized cooling solution.

The working solution enters the n-stage absorber 7, absorbs the steam from the n-stage steam generator 3, and then enters the generator 8. The steam generated by the generator 8 enters the condenser 4 or is used for other purposes. The concentrated working solution enters the first absorber 5 and is circulated again.

The condenser 4, or a certain stage of steam generator, or a certain stage of absorber is connected with the generator 8 of the absorption refrigeration system, and transfers heat to the working solution in the generator 8 of the refrigeration system, and after the working solution is concentrated to a required concentration, the working solution returns to the first absorber 5 of the refrigeration system again, and the refrigeration cycle is performed again.

In example 2, compared with example 1, an absorption refrigeration system is added to the system in this embodiment, so that not only the low-temperature heat source temperature can be raised to a higher temperature, but also the refrigerating 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 transferred to low temperature.

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

The primary refrigeration system adopts 62% of conventional concentration, the secondary refrigeration system adopts 55% of working solution, and the cooling solution of the secondary refrigeration system adopts 30% of lithium bromide solution.

Referring to fig. 6 in combination, 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 7-DEG cold water. The 7-degree cold water exchanges heat with the working solution in the secondary refrigeration system absorber 210, and reduces the temperature of the 55% working solution of the secondary refrigeration system to about 12 degrees. At this time, the pressure of the 55% lithium bromide solution is about 0.23kp, and the 30% refrigerant lithium bromide solution is evaporated in the evaporator 29 of the secondary refrigeration system, and the generated water vapor enters the first 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 solution temperature is about-5 ℃.

In this way, a low temperature of less than 0 degree can be generated by the lithium bromide refrigeration system, and at the same time, a low temperature of less than 0 degree can be generated by the lithium bromide refrigerator.

This scheme may be applied in some scenarios, for example: a power plant.

Are commonly applied to cooling water systems to reduce water and heat consumption of cooling towers while providing hot water or steam at a certain temperature. The device can be applied to central heating in winter, can directly generate 120-DEG hot water, does not need to extract steam from a steam turbine, and is used for heating the hot water. The existing lithium bromide heat pump technology can only generate hot water of 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 temperature of the backwater of heating can be reduced to about 10 degrees. The existing lithium bromide refrigeration system can obtain cold water with the temperature of about 7 ℃. In the system of the present invention, the hot water of the primary heating network is reduced from 50 degrees to about 10 degrees, and the heat is transferred to the generator 8. The working solution in the generator 8 is heated by the steam generated by the existing district heating boiler. The steam generated by heating the working solution in the generator 8 exchanges heat and condenses with the heating backwater of the secondary network, and simultaneously heats the heating backwater of the secondary network.

In areas where there is no boiler room and there is a significant amount of power, compressor units may be provided. For example, a steam compressor pumps the steam in the generator 8, and then sends the compressed high-pressure steam back to the generator 8, and exchanges heat with the working solution in the generator 8 through a heat exchanger. The liquid water after the high-pressure steam is condensed exchanges heat with the backwater of the heating secondary network; the latent heat of condensation of the high pressure steam causes the working solution in the generator 8 to continue to evaporate. Or a compressor adopting other refrigerants such as CO2 and the like, the exhaust end of the compressor is connected with the generator 8, the working solution in the generator 8 is heated by utilizing the exhaust temperature, and the generated steam is evaporated to exchange heat with the heating backwater of the secondary network.

The scheme can also be applied in other scenarios, for example: desalting sea water.

The method can realize simultaneous delivery of cold, hot and water, and can be used for air conditioning of buildings and the like, and the generated heat is conveyed to heat-using places of dining halls and the like of the buildings.

Example 3, used for simple air conditioning refrigeration, has substantially no thermal load.

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

At the steam outlet of the generator 8 an accumulator 9 is provided. When the accumulator 9 reaches a certain requirement, the external heat source is closed, and the working solution in the generator 8 is heated by utilizing the heat stored in the accumulator 9. The temperature of the accumulator 9 is reduced and the external heat source is restarted.

Further, if the temperature of the external heat source is sufficiently high, a secondary steam generator 81 is provided. The generation temperature of the secondary steam generator 81 is lower than the generation temperature of the generator 8. The accumulator 9 heats the working solution in the secondary steam generator 81 and concentrates the working solution.

Example 4 dehumidifier.

In this embodiment, air is passed through the first absorber 5, and water vapor in the air is absorbed by the lithium bromide solution in the first absorber 5. The cooling solution introduced into the first absorber 5 is heated, and the generated vapor enters the first absorber 6 and is absorbed by the lithium bromide solution in the first absorber 6. Finally, the lithium bromide solution flows out of the n-stage absorber 7 into the generator 8. After the generator 8 is heated by an external heat source and the original concentration is recovered, the water flows out of the generator 8 and enters the first absorber 5 to be circulated again.

Example 5, for air conditioning in high humidity areas, both reduces the effect of heat load by refrigeration, counteracts, and ensures humidity. Such as: application scenes 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 great latent heat of the water vapor. The treated air is then humidified, typically by heating 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. The water vapor in the air is absorbed through the lithium bromide solution, then the cooling system cools the dried air, and then the evaporated water vapor in the lithium bromide solution is sent back to the treated air, so that the requirements of temperature and humidity are met.

When no waste heat resource exists in the field, the compressor refrigeration and the dehumidification method of the example 4 are adopted.

First, air is passed through the first absorber 5, and water vapor in the air is absorbed by the working solution in the first absorber 5. The dry air flowing out of the first absorber 5 flows through an evaporator of the mechanical refrigeration system, and exchanges heat with the evaporator to cool.

The lithium bromide solution flows out of the first absorber 5 into the primary absorber 6. Absorbs the vapor of the cooling solution in the first absorber 5 and then enters the next absorber 6.

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

Since the discharge temperature of the compressor unit is not very high, the number of stages of the absorber is not much. The working solution enters the generator 8, exchanges heat with the high-temperature high-pressure refrigerant discharged by the compressor, and returns to the first absorber 5 after being concentrated.

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

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

When there is available waste heat in the field, the refrigeration adopts lithium bromide absorption refrigeration mode, as in example 2.

Because lithium bromide refrigeration needs to keep high vacuum, the working solution absorbing water vapor is completely isolated from the refrigeration system, and only exchanges heat without exchanging working medium.

As with mechanical refrigeration, the air to be treated flows into the first absorber 5 of the dehumidification system. The lithium bromide solution in the first absorber 5 absorbs water vapor in the air and flows into the first 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 level of steam generator, a certain level of absorber, or condenser 4 of the system according to the invention. The vaporized water vapor is combined with the dry air cooled by the refrigeration system to adjust to the 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 examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the present invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.

Claims

1. The device for improving the temperature of the low-temperature heat source is characterized by comprising a steam source, a first absorber, a first-stage steam generator, a first-stage absorber, a second-stage steam generator, a second-stage absorber, an n-stage steam generator, an n-stage absorber, a generator and a condenser, wherein the first absorber, the first-stage steam generator, the first-stage absorber, the second-stage steam generator, the second-stage absorber, the n-stage steam generator, the n-stage absorber, the generator and the condenser are connected with the steam source, and n is more than or equal to 2;

the cooling liquid system is sequentially connected with the first absorber, the primary steam generator, the primary absorber, the secondary steam generator, the secondary absorber, the n-stage steam generator and the n-stage absorber, and contains a cooling solution with the same component as the working solution;

the steam source is communicated with the steam cavity of the first absorber, the primary steam generator is communicated with the steam cavity of the primary absorber, and the solution outlet of the first absorber is connected with the 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 generator is connected with the solution inlet of the first absorber;

the first heat exchanger is connected with the first absorber so that the cooling solution is communicated with the first absorber through the first heat exchanger to realize heat exchange;

the device for raising the temperature of the low-temperature heat source further comprises:

passing the cooling solution into a first absorber;

2. The apparatus for increasing the temperature of a low temperature heat source of claim 1, further comprising an accumulator, wherein the steam outlet of the generator is connected to the inlet of the accumulator, and wherein the outlet of the accumulator is connected to a secondary steam generator, wherein the secondary steam generator has a lower temperature than the generator.

3. The apparatus for increasing the temperature of a low temperature heat source of claim 1, wherein the generator is connected to an exhaust end of the compression system.

4. The apparatus for increasing the temperature of a low temperature heat source according to claim 1, wherein the generator has a plurality of chambers, each of the chambers having a steam chamber, a steam outlet of the steam chamber of the chamber being connected to a corresponding place where heat is required; a passage is provided between the chambers to allow the working solution to flow between the chambers;

5. The apparatus for increasing the temperature of a low temperature heat source according to claim 1, wherein the generator is a single-effect or multiple-effect evaporation system.

6. The apparatus for increasing the temperature of a low temperature heat source as recited in claim 5 wherein said single or multiple effect evaporation system is coupled to an absorption refrigeration system, said vapor source is coupled to a generator vapor chamber of said absorption refrigeration system, or said vapor source is coupled to a cooling system of said absorption refrigeration system.

7. A method of using the low temperature heat source temperature raising apparatus of claim 1.