WO2012065296A1

WO2012065296A1 - Absorption cooling and power co-supply circulation system and absorption cooling and power co-supply method

Info

Publication number: WO2012065296A1
Application number: PCT/CN2010/078751
Authority: WO
Inventors: 史晓云; 邢玉民; 韩少华; 向松
Original assignee: 思安新能源股份有限公司
Priority date: 2010-11-15
Filing date: 2010-11-15
Publication date: 2012-05-24

Abstract

An absorption cooling and power co-supply circulation system (500) and an absorption cooling and power co-supply method are provided. The circulation system (500) includes a steam generator (501), a first gas-liquid separator (502), a turbine (503), a second gas-liquid separator (505), a condenser (506), a throttling device (507), a refrigeration evaporator (508), an absorber (509), a circulation pump (510) and a heat regenerator (511), all of which are sequentially connected to form a loop. A heat resource pipeline (516) is disposed in the steam generator (501), and the heat resource is supplied into the heat resource pipeline (516). The turbine (503) outputs power, and the refrigeration evaporator (501) outputs cold energy. A first pathway is disposed between the first gas-liquid separator (502) and the steam generator (501), and a second pathway is disposed between the second gas-liquid separator (505) and the absorber (509). The circulation system (500) further includes a reverse pathway from the steam generator (501) to the absorber (509) and passing through the heat regenerator (511), and in the reverse pathway, a first decompression device (513) is connected between the heat regenerator (511) and the absorber (509), and a second decompression device (514) is connected in the second pathway. The circulation system (500) can effectively transfer various heat resources into power and cold energy, and thereby improve the utilization of heat resources.

Description

Absorption type cold work combined circulation system and absorption type cold work joint supply method

Technical field

The invention relates to the field of heat source utilization, in particular to an absorption type cold work combined supply circulation system and an absorption type cold work joint supply method.

Background technique

In industrial production, such as cement, glass, steel and other industrial products, there are various forms and temperature levels of waste heat resources. If these waste heat are directly discharged into the environment, it will cause huge waste of energy and environmental pollution. In addition, there are a large number of renewable heat sources such as solar energy and geothermal energy in nature. From the perspective of national energy conservation and emission reduction, it is necessary to recycle waste heat resources and renewable heat sources generated in industrial production.

According to the temperature grade of waste heat (also referred to as heat source in this paper), the heat source is usually divided into three categories: high temperature, medium temperature and low temperature: the temperature is higher than 650 °C. The heat source is a high temperature heat source, and the heat source with a temperature between 250 and 650 °C is a medium temperature heat source at a temperature of 250 °C. The following heat sources are low temperature heat sources. For high temperature and medium temperature heat sources, waste heat boilers and steam turbine generators are generally used for power generation, while for low temperature heat sources below 250 °C, Mainly used for heating alone, generating electricity separately or separately.

Low-temperature heat source power generation generally uses organic Rankine Cycle technology and Kalina Cycle ( Kalina Cycle) technology. The organic Rankine cycle uses a low boiling organic working medium (referred to as working fluid), such as R123 refrigerant, R113 refrigerant, R245FA Refrigerant or isopentane. Figure 1 shows a schematic of an organic Rankine cycle. The working cycle is as follows: the organic working fluid absorbs the low temperature heat source pipe 102 in the steam generator 101. The heat generates saturated or superheated organic working fluid vapor, which then enters the turbine 103 (or expander) for work and passes through a generator 104 coupled to the turbine 103. Output power generation. Then, the organic working medium enters the condenser 105 to condense and release heat to form a liquid, and the liquid organic working medium is further pressurized by the supply pump 106 to enter the steam generator. This completes a complete loop.

Kalina cycle technology is a new type of power cycle with ammonia water mixture as the working fluid. It makes the endothermic temperature curve of the working fluid and the exothermic temperature curve of the heat source match well, thus reducing the irreversible loss. In addition, it can significantly improve energy efficiency and has unique advantages in combined cycle and heat source utilization. Figure 2 shows a schematic of the Kalina Cycle. The ammonia working solution is pressurized by the supply pump 201 and heated by the preheater 202, and then enters the steam generator 203, and the low temperature heat source pipe 204 After heating, evaporation and overheating, superheated ammonia steam is produced. The superheated ammonia steam then enters the turbine 205 for work and outputs the amount of power generated by the generator 206 connected to the turbine 205. From turbine 205 The medium discharged is cooled by the distiller 207, and then diluted by the ammonia-depleted solution separated from the separator 210 into a basic solution, which is condensed into the absorber 208; leaving the absorber 208 The saturated liquid is pressurized by the condensing pump 209, and a part of the liquid is heated by the reheater 213 and the distiller 207, and then separated into the separator 210. In the separator 210 The ammonia-rich vapor and the ammonia-depleted solution are separated. The ammonia-depleted solution is cooled by the reheater 213, and then depressurized by the throttling device 211 to dilute the working solution discharged from the turbine 205 to form a basic solution of ammonia. Splitter 210 The separated ammonia-rich vapor is cooled by the preheater 202, mixed with another part of the ammonia basic solution into an ammonia working solution, and then condensed into a saturated liquid by the cooling water in the condenser 212, and finally supplied to the pump. 201 Pressurize to complete a cycle.

Figure 3 shows a schematic diagram of a prior art ammonia water absorption refrigeration cycle. From absorber 301 The saturated aqueous base solution of the ammonia water flowing out is pressurized by the feed pump 302 and preheated in the heat exchanger 303, and then enters the rectifier 304 for separation. Rectifier 304 The ammonia rich vapor and the lean ammonia solution are separated. The ammonia-rich vapor is condensed in the condenser 305 into a saturated liquid, a portion of the saturated liquid is returned to the rectifier 304, and the other portion is passed through the throttling device 306. After the throttle is depressurized, it is vaporized into the evaporator 307 to generate a cooling capacity. The ammonia-rich saturated steam flowing from the evaporator 307 and the throttling device 308 separated from the rectifier 304 The lean ammonia solution after the pressure reduction enters the absorber 301 to absorb the condensation to form a basic solution of ammonia water, which is supplied to the supply pump 302 to continuously circulate.

In order to achieve the purpose of simultaneous power generation and refrigeration, an absorption type cold power supply and supply circulation system is further proposed in the prior art, as shown in FIG. Shown. The absorption type cold power supply and circulation system includes a rectifier 401, a condenser 402, a steam generator 403, a superheater 404, a turbine 405, a generator 406, and a throttling device. 407, preheater 408, circulation pump 409, absorber 410, evaporator 411, heat source pipe 412, cold output pipe 413, absorber cooling water pipe 414 , condenser cooling pipe 415 and heat source. The rectifier 401 is connected to the condenser 402 and the steam generator 403, and the steam generator 403 is sequentially connected to the superheater 404 and the turbine 405. Connected, turbine 405 is coupled to generator 406, condenser 402 is in turn coupled to throttle 407, evaporator 411, and absorber 410 is coupled to turbine 405 and evaporator 411, the absorber 410 is connected to the circulation pump 409, and the circulation pump 409 is connected to the preheater 408 and the rectifier 401 in sequence to form a working medium circulation passage. Heat source along heat source pipe 412 Heat is supplied through the superheater 404, the steam generator 403, and the preheater 408 in sequence. The evaporator 411 outputs a cooling amount through the cooling output pipe 413. Absorber 410 There is a cooling water pipe 414 having a cooling water pipe 415 for cooling the ammonia water by the cooling water.

The above prior art work cycle process is: rectifier 401 The basic solution of the ammonia water mixture is separated into an ammonia-rich steam and an ammonia-lean solution, and the ammonia-lean solution passes through a steam generator 403 and a superheater 404 to form a high-pressure superheated ammonia-depleted steam, which enters the turbine 405. Work is done and the generator 406 outputs electrical energy. The ammonia-rich vapor passes through the condenser 402 and the throttling device 407 to form a low-drying wet saturated steam that enters the evaporator 411. The heat is absorbed to output the cooling amount. The saturated ammonia-rich vapor and the ammonia-depleted vapor are cooled in the absorber 410 to form a basic solution of ammonia, which is a saturated solution. Saturated solution passes through circulation pump 409 The pressure is increased and then preheated in the preheater 408 to enter the rectifier 401 in the rectifier 401 A high concentration of ammonia-rich vapor and a low concentration of ammonia-depleted solution are separated. This completes a work cycle.

The above-mentioned existing absorption type cold-supplied circulation system is that the lower-concentration ammonia-depleted solution separated from the rectifier is heated and evaporated in a steam generator, and then superheated by the superheater, which is generated by absorbing heat of the heat source. Superheated ammonia vapor, therefore, requires a higher temperature of the heat source, and the system cannot be used for a lower temperature heat source such as the low temperature heat source described above. In addition, the higher purity ammonia steam separated by the rectifier is passed through the condenser and the throttling device in turn, wasting the pressure energy of the ammonia steam.

Therefore, there is a need for a new absorption type cold work combined supply system and an absorption type cold work method to solve the above problems.

Summary of the invention

In order to overcome the above deficiencies of the prior art, the present invention first provides an absorption type cold work combined supply circulation system. The circulation system uses a non-azeotropic solution as a working medium, and the circulation system includes a steam generator sequentially connected in a loop, a first-stage gas-liquid separator, a turbine, a second-stage gas-liquid separator, a condenser, a throttling device, a refrigerating evaporator, an absorber, a circulation pump and a regenerator, wherein the steam generator is provided with a heat source pipe into which the heat source is passed, and the turbine is used for outputting the machine a cooling evaporator for outputting a cooling capacity, wherein a first passage is provided between the first-stage gas-liquid separator and the steam generator for using the first-stage gas-liquid separator Separating liquid working medium is recovered to the steam generator, and a second passage is disposed between the second-stage gas-liquid separator and the absorber for separating the second-stage gas-liquid separator The liquid working medium is recovered to the absorber, the circulation system further comprising a reverse path from the steam generator to the absorber via the regenerator, on the reverse path, Between the regenerator and the absorber A first decompression device is connected, and a second decompression device is connected to the second passage.

Preferably, on the loop, a first mixer is connected between the regenerator and the steam generator, and the first passage is from the first stage gas-liquid separator via the first A mixer to the steam generator.

Preferably, a second mixer is connected between the first pressure reducing device and the absorber, the second passage is from the second stage gas-liquid separator via the second pressure reducing device and The second mixer to the absorber.

Preferably, the first pressure reducing device and the second pressure reducing device are pressure reducing valves.

Preferably, the throttling device is a throttle valve.

Preferably, the turbine drives a generator output power connected thereto.

Preferably, the non-azeotropic solution is an aqueous ammonia solution.

Preferably, the heat source has a temperature between 80 ° C and 250 ° C.

The invention also provides an absorption type cold work combined supply circulation system, The circulation system uses an aqueous ammonia solution as a working medium, and the circulation system includes a steam generator sequentially connected in a loop, a first-stage gas-liquid separator, a turbine, and a second-stage gas-liquid separator. a condenser, a throttling device, a refrigerating evaporator, an absorber, a circulation pump, and a regenerator, and a first mixer is connected between the regenerator and the steam generator to form from the first a stage gas-liquid separator via the first mixer to a first passage of the steam generator, the circulation system further comprising a reverse passage from the steam generator to the absorber via the regenerator a second mixer connected between the regenerator and the absorber to form a second stage gas-liquid separator from the second stage to the a second passage of the absorber, a first pressure reducing device is coupled between the regenerator and the second mixer, and between the second stage gas liquid separator and the second mixer Connected to a second pressure reducing device, wherein the steam generator is set There is a heat source pipe into which the heat source is passed, and the turbine is used for outputting power to drive the output power of the generator connected thereto, The refrigerating evaporator is used to output a cooling capacity.

Preferably, the heat source has a temperature between 80 ° C and 250 ° C.

Preferably, the throttling device is a throttle valve, and the first decompression device and the second decompression device are pressure reducing valves.

The present invention provides an absorption type cold work co-supply method using the above circulation system, the method comprising the following steps: a. Having the aqueous ammonia solution absorb heat of the heat source in the steam generator and generate ammonia wet steam; b. Providing the aqueous ammonia wet steam to the first stage gas-liquid separator, and separating the first ammonia-rich vapor and the first liquid ammonia-lean solution by the first-stage gas-liquid separator; c. Supplying the first ammonia-rich vapor to the turbine, and expanding work by the turbine, outputting mechanical power to drive the generator output power, and the first a liquid ammonia-lean solution is supplied to the steam generator via the first passage; d. Supplying the ammonia-rich wet steam discharged from the turbine to the second-stage gas-liquid separator, and separating the second ammonia-rich vapor and the second liquid-lean ammonia solution by the second-stage gas-liquid separator; e. And supplying the second ammonia-rich vapor to the refrigeration evaporator after being condensed by the condenser and decompressing the throttling device to output a refrigeration amount, and the second liquid ammonia-lean solution is passed through the first Two channels are provided to the absorber; f. Providing the ammonia-rich vapor discharged from the refrigerating evaporator to the absorber; g. supplying an ammonia-lean solution that is not evaporated in the steam generator to the absorber via the reverse passage; and h. The ammonia aqueous solution solution formed in the absorber is supplied to the steam generator via the first mixer after being pressurized by the circulation pump and preheated by the regenerator.

Preferably, the heat source has a temperature between 80 ° C and 250 ° C.

An absorption type cold work combined circulation system according to the present invention, which uses a non-azeotropic solution (for example, an aqueous ammonia solution) As a circulating medium, a two-stage gas-liquid separation device converts the heat source into work and cooling capacity at the same time, making full use of low-temperature heat sources that are not available or difficult to use in the prior art (eg 80 °C -250 °C). ), effectively recovering low temperature heat sources. Further, the circulation system and method according to the present invention also fully utilizes the pressure energy of the circulating medium, thereby improving the utilization of the heat source.

A series of simplified forms of concepts are introduced in the Summary of the Invention section, which will be described in further detail in the Detailed Description section. The summary is not intended to limit the key features and essential technical features of the claimed invention, and is not intended to limit the scope of protection of the claimed embodiments.

Advantages and features of the present invention are described in detail below with reference to the accompanying drawings.

DRAWINGS

Figure 1 shows a schematic diagram of an organic Rankine cycle in the prior art;

Figure 2 shows a schematic diagram of a prior art Kalina cycle;

Figure 3 is a schematic view showing a prior art ammonia water absorption refrigeration cycle;

Figure 4 is a schematic view of an absorption type cold current supply and circulation system in the prior art;

Figure 5 is a schematic illustration of an absorption type cold work combined supply cycle system in accordance with one embodiment of the present invention;

Fig. 6 is a flow chart showing a method of performing an absorption type cold work in a circulation system according to an embodiment of the present invention.

detailed description

In the following description, numerous specific details are set forth in the However, it will be apparent to those skilled in the art that the present invention may be practiced without one or more of these details. In other instances, some of the technical features well known in the art have not been described in order to avoid confusion with the present invention.

In order to thoroughly understand the present invention, a detailed structure will be set forth in the following description. It is apparent that the practice of the present invention is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the present invention are described in detail below, but the present invention may have other embodiments in addition to the detailed description.

The invention discloses an absorption type cold work combined supply circulation system (hereinafter referred to as a circulation system), and the following drawings are required to be noted. The direction of the arrow in the direction shows the direction of flow of the working medium therein.

Figure 5 is a schematic illustration of an absorption type cold work combined feed system 500 in accordance with one embodiment of the present invention. Circulatory system 500 A non-azeotropic solution is used as the working medium. The non-azeotropic solution may be an aqueous ammonia solution, an aqueous solution of ethylamine, an aqueous solution of methylamine, Or a mixed solution of sodium thiocyanate and ammonia. The non-azeotropic solution may also be an aqueous solution of lithium bromide, an aqueous solution of lithium chloride, an aqueous solution of lithium iodide, or an aqueous solution of calcium chloride. The non-azeotropic solution may also be a mixed solution of methanol and lithium bromide, a mixed solution of methanol and zinc bromide, or a mixed solution of methanol, lithium bromide and zinc bromide. In addition, the non-azeotropic solution can also be A mixed solution of R21, R22 and organic substances such as tetraethanol dimethyl ether.

The circulation system 500 includes a steam generator 501 that is sequentially connected in a loop, a first-stage gas-liquid separator 502, and a turbine 503, second stage gas-liquid separator 505, condenser 506, throttling device 507, refrigeration evaporator 508, absorber 509, circulation pump 510 and regenerator 511 . Wherein, the direction of the sequential connection is the flow direction of the working medium in the above loop.

The steam generator 501 is provided with a heat source pipe 516, the heat source is passed into the heat source pipe 516, and the working medium is in the steam generator 501 is heated to produce steam. Since only steam is required, various heat sources can be used, especially low temperature heat sources from 80 °C to 250 °C. First stage gas-liquid separator 502 and steam generator 501 Connection, steam generator 501 The generated steam enters the first stage gas-liquid separator 502 for gas-liquid separation. The turbine 503 is connected to the first stage gas-liquid separator 502, and the turbine 503 Utilizing the first stage gas-liquid separator 502 The received vaporous working medium expands to perform work and outputs mechanical power to drive the mechanical device. For example, it can be used to drive generators for power generation, or for industrial dragging, such as dragging fans, compressors, pumps, and the like. Wherein the mechanical device can be any device that requires mechanical power, such as a generator, a fan, a compressor, a pump, and the like. Turbine according to an embodiment of the invention The 503 can be coaxially coupled to the generator 504 to drive the generator 504 to output power. In addition, in the first stage gas-liquid separator 502 and steam generator 501 A first passage is also provided between the liquid working medium separated from the first stage gas-liquid separator 502 to the steam generator 501 . It will be appreciated that the first passage is not limited to the situation shown in the figures, and the first passage may also be a passage that is directly connected to the steam generator 501 from the first stage gas-liquid separator 502.

The second stage gas-liquid separator 505 is connected to the turbine 503 for the counter turbine 503 The working medium is taken out for further gas-liquid separation. Wherein, the liquid working medium separated by the second-stage gas-liquid separator 505 can be disposed in the second-stage gas-liquid separator 505 and the absorber 509 The second path between is recycled to the absorber 509. The second stage gas-liquid separator 505 separates the vapor working medium from the condenser 506 for condensation, and the throttling device 507 depressurizes the cooling evaporator 508. The evaporation endotherm is performed, and the cooling capacity is outputted through the cooling output pipe 518. Among them, the throttle device 507 can be a device commonly used in the art, for example, a throttle valve or the like. From refrigeration evaporator 508 The resulting working medium enters the absorber 509 and is condensed by the absorber cooling pipe 519, then enters the circulation pump 510 for boosting, and the regenerator 511 is preheated to enter the steam generator 501. Medium.

The circulatory system 500 also includes a steam generator 501 via a regenerator 511 to an absorber 509 The reverse path for supplying the working medium that is not evaporated by the heat source pipe 516 in the steam generator 501 to the absorber 509 through the regenerator 511. The reverse path can realize the working medium The purpose of recycling is to form a circulation. In addition, due to the heating of the heat source pipe, the temperature of the working medium flowing through the reverse path is high, and after heat exchange by the regenerator 511, the circulation pump 510 can be supplied. The working medium is preheated, thus increasing energy utilization.

On the reverse path, a first pressure reducing device 513 is connected between the regenerator 511 and the absorber 509. . A second pressure reducing device 514 is connected to the second passage. The first pressure reducing device 513 and the second pressure reducing device 514 may be conventional pressure reducing devices such as a pressure reducing valve. First decompression device 513 And the second pressure reducing device 514 can regulate the pressure of the working medium flowing into the absorber 509 through the second passage and the reverse passage, thereby ensuring effective mixing of the working medium from the two passages. Thus, the working medium completes a duty cycle in the absorption type cold work combined circulation system 500 according to the present invention. In addition, The above components are well known to those skilled in the art, and thus the structure of the above components themselves will not be described in detail.

Preferably, on the loop, a first mixer 512 is connected between the regenerator 511 and the steam generator 501 and The liquid working medium separated by the first stage gas-liquid separator 502 flows into the steam generator 501 via the first mixer 512. That is, the first passage is from the first stage gas-liquid separator 502 via the first mixer 512 to steam generator 501. The first mixer 512 can uniformly mix the liquid working medium from the first stage gas-liquid separator 502 and the working medium from the regenerator.

Preferably, a second mixer 515 is connected between the first pressure reducing device 513 and the absorber 509, and The liquid working medium separated by the second stage gas-liquid separator 505 flows into the absorber 509 via the second pressure reducing valve 514 and the second mixer 515. That is, the second passage is from the second stage gas-liquid separator 505 Via the second pressure reducing device 514 and the second mixer 515 to the absorber 509. The second mixer 515 can be brought from the second stage gas-liquid separator 505 The liquid working medium and the unvaporized working medium from the regenerator are uniformly mixed therein.

Since the endothermic temperature profile of the aqueous ammonia solution and the exothermic temperature profile of the heat source are well matched, and the ammonia solution cost is low, Aqueous ammonia solution is preferably employed as the working medium. Hereinafter, a circulation system of a preferred embodiment of the present invention will be described using an aqueous ammonia solution as a working medium.

The aqueous ammonia solution is heated in the steam generator 501 to produce ammonia wet steam Since only steam is required, various heat sources can be used, especially low temperature heat sources from 80 °C to 250 °C. The first stage gas-liquid separator 502 is connected to the steam generator 501, the steam generator The 501 produced ammonia wet steam enters the first stage gas-liquid separator 502 for gas-liquid separation. After separation by the first stage gas-liquid separator 502, the ammonia wet steam is separated into a first liquid ammonia-lean solution and a first ammonia-rich vapor. The turbine 503 is coupled to a first stage gas-liquid separator 502, and the turbine 503 utilizes a first stage gas-liquid separator 502. The first ammonia-rich vapor received is work, and the output power is used to drive the mechanical device. Turbine 503 can be coaxially coupled to generator 504 to drive generator 504, in accordance with one embodiment of the present invention. Output power. In addition, a first passage for separating the first liquid ammonia-depleted solution of the first-stage gas-liquid separator 502 is further disposed between the first-stage gas-liquid separator 502 and the steam generator 501. Recycled to steam generator 501. It is to be understood that the first passage is not limited to the one shown in the drawing, and the first passage may be directly connected to the steam generator 501 from the first stage gas-liquid separator 502. Pathway.

The second stage gas-liquid separator 505 is connected to the turbine 503, turbine 503 After work, the first ammonia-rich vapor forms ammonia-rich wet steam. The ammonia-rich wet steam from the turbine 503 enters the second stage gas-liquid separator 505 The second liquid ammonia-lean solution and the second ammonia-rich vapor are further separated. Wherein, the second liquid ammonia-lean solution can be recovered to the absorber through a second passage disposed between the second-stage gas-liquid separator 505 and the absorber 509 509.

The condenser 506 is connected to the second stage gas-liquid separator 505, and the condenser 506 is provided with a condenser cooling pipe 517. For condensing a nearly pure second ammonia-rich vapor to form a liquid near-pure ammonia solution. The throttle device 507 is connected to the condenser 506 for pairing The ammonia solution is throttled and depressurized to form a low dry ammonia wet steam. Among them, the throttle device 507 can be a device commonly used in the art, for example, a throttle valve or the like. The ammonia wet steam enters the throttling device 507 The evaporative endotherm is performed in the refrigerating evaporator 508, and the cooling capacity is outputted through the cooling output pipe 518. The ammonia-rich vapor from the refrigerating evaporator 508 enters the absorber 509 and is cooled by the absorber. The 519 is condensed, then introduced into the circulation pump 510 for boosting, and the regenerator 511 is preheated and then enters the steam generator 501.

The circulatory system 500 also includes a steam generator 501 via a regenerator 511 to an absorber 509 The reverse path for supplying the aqueous ammonia solution which is not vaporized by the heat source pipe 516 in the steam generator 501 to the absorber 509 through the regenerator 511.

On the reverse path, a first pressure reducing device 513 is connected between the regenerator 511 and the absorber 509. . A second pressure reducing device 514 is connected to the second passage. The first pressure reducing device 513 and the second pressure reducing device 514 may be conventional pressure reducing devices such as a pressure reducing valve. First decompression device 513 And the second pressure reducing device 514 can regulate the pressure of the working medium flowing into the absorber 509 through the second passage and the reverse passage, thereby ensuring effective mixing of the working medium from the two passages. Thus, the aqueous ammonia solution completes a duty cycle in the absorption type cold work combined circulation system 500 according to the present invention.

On the loop, a first mixer 512 is connected between the regenerator 511 and the steam generator 501 and The first liquid ammonia-lean solution separated by the first-stage gas-liquid separator 502 flows into the steam generator 501 via the first mixer 512. That is, the first passage is from the first stage gas-liquid separator 502 via the first mixer 512 to steam generator 501. A second mixer 515 is connected between the first pressure reducing device 513 and the absorber 509, and the second stage gas-liquid separator 505 is connected The separated second liquid ammonia-lean solution flows into the absorber 509 via the second pressure reducing valve 514 and the second mixer 515. That is, the second passage is from the second stage gas-liquid separator 505 via the second pressure reducing unit 514. And a second mixer 515 to an absorber 509. The ammonia-lean solution from the second mixer 515 and the ammonia-rich vapor from the refrigeration evaporator 508 enter the absorber 509 together. The intermediate absorber cooling pipe 519 is cooled to form a liquid ammonia basic solution. Then, the ammonia aqueous solution enters the circulation pump 510 for boosting, and the regenerator 511 is preheated to enter the first mixer 512. . In the first mixer 512, the ammonia basic solution is mixed with the first liquid ammonia-lean solution separated from the first-stage gas-liquid separator 502 and then introduced into the steam generator 501.

The present invention further discloses the circulatory system of the above preferred embodiment for performing the absorption cold work co-supplied method 600, as shown in FIG. As shown, the method 600 includes the following steps:

Step 601, so that the aqueous ammonia solution absorbs the heat source in the steam generator (especially 80 ° C -250 ° C The low temperature heat source) generates heat and produces ammonia wet steam. Step 602, the ammonia water wet steam is supplied to the first stage gas-liquid separator, and the first ammonia-rich vapor and the first liquid ammonia-lean solution are separated by the first-stage gas-liquid separator; 603, the first ammonia-rich vapor is supplied to the turbine, and is expanded by the turbine to perform work, outputting mechanical power to drive the generator output power, and the first a liquid ammonia-lean solution is supplied to the steam generator via the first passage to recover the aqueous ammonia solution; step 604 And supplying the ammonia-rich wet steam discharged from the turbine to the second-stage gas-liquid separator, and separating the second ammonia-rich vapor and the second liquid-lean ammonia solution by the second-stage gas-liquid separator; step 605 And supplying the second ammonia-rich vapor to the refrigerating evaporator after being condensed by the condenser and decompressing the throttling device to output a cooling capacity, and supplying the second liquid ammonia-lean solution to the absorber via the second passage; step 606 And supplying ammonia-saturated vapor discharged from the refrigerating evaporator to the absorber; and step 607, supplying the un-evaporated ammonia-depleted solution in the steam generator to the absorber via the reverse path; and step 608, forming the ammonia water formed in the absorber The base solution is supplied to the steam generator via the first mixer after being warmed up by the circulation pump and preheated by the regenerator.

It should also be understood that when referring to 'sequential connections' or 'connecting' multiple devices, this 'sequential connection' or 'connection' may be to directly connect adjacent devices together, or adjacent Other devices can be connected between the devices.

An absorption type cold work combined circulation system and method according to the present invention, which employs a non-azeotropic solution (for example, an aqueous ammonia solution) As a circulating medium, a two-stage gas-liquid separation device converts the heat source into work and cooling capacity at the same time, making full use of low-temperature heat sources that are not available or difficult to use in the prior art (eg 80 °C -250 °C). ), effectively recovering low temperature heat sources. Further, the circulation system and method according to the present invention also fully utilizes the pressure energy of the circulating medium, thereby improving the utilization of the heat source.

The present invention has been described by the above-described embodiments, but it should be understood that the above-described embodiments are only for the purpose of illustration and description. Further, those skilled in the art can understand that the present invention is not limited to the above embodiments, and various modifications and changes can be made according to the teachings of the present invention. These modifications and modifications are all claimed in the present invention. Within the scope. The invention The scope of protection is defined by the appended claims and their equivalents.

Claims

Absorption type cold work combined circulation system The circulation system uses a non-azeotropic solution as a working medium, and the circulation system includes a steam generator sequentially connected in a loop, a first-stage gas-liquid separator, a turbine, and a second-stage gas. a liquid separator, a condenser, a throttling device, a refrigerating evaporator, an absorber, a circulation pump, and a regenerator, wherein the steam generator is provided with a heat source pipe into which the heat source is passed, the turbine For outputting mechanical power, the refrigerating evaporator is for outputting a cooling capacity, wherein a first passage is provided between the first-stage gas-liquid separator and the steam generator for using the first stage a liquid working medium separated by the gas-liquid separator is recovered to the steam generator, and a second passage is disposed between the second-stage gas-liquid separator and the absorber for using the second-stage gas a liquid working medium separated by a liquid separator is recovered to the absorber, the circulation system further comprising a reverse passage from the steam generator to the absorber via the regenerator, in the reverse passage Above, the regenerator and the A first decompression device is connected between the absorbers, and a second decompression device is connected to the second passage.
According to claim 1 The circulation system is characterized in that, on the loop, a first mixer is connected between the regenerator and the steam generator, and the first passage is from the first stage gas A liquid separator is passed to the steam generator via the first mixer.
According to claim 2 The circulation system is characterized in that a second mixer is connected between the first pressure reducing device and the absorber, and the second passage is from the second stage gas-liquid separator. The second pressure reducing device and the second mixer are described to the absorber.
The circulation system according to claim 3, wherein said first pressure reducing means and said second pressure reducing means are pressure reducing valves.
The circulation system according to claim 1, wherein said throttle device is a throttle valve.
The circulatory system according to claim 1, wherein said turbine drives a generator output power connected thereto.
A circulation system according to any one of claims 1 to 6, wherein the non-azeotropic solution is an aqueous ammonia solution.
A circulation system according to any one of claims 1 to 6, wherein the temperature of the heat source is between 80 ° C and 250 ° C Between.
An absorption type cold work combined circulation system, The circulation system uses an aqueous ammonia solution as a working medium, and the circulation system includes a steam generator sequentially connected in a loop, a first-stage gas-liquid separator, a turbine, and a second-stage gas-liquid separator. a condenser, a throttling device, a refrigerating evaporator, an absorber, a circulation pump, and a regenerator, and a first mixer is connected between the regenerator and the steam generator to form from the first a stage gas-liquid separator via the first mixer to a first passage of the steam generator, the circulation system further comprising a reverse passage from the steam generator to the absorber via the regenerator a second mixer connected between the regenerator and the absorber to form a second stage gas-liquid separator from the second stage to the a second passage of the absorber, a first pressure reducing device is coupled between the regenerator and the second mixer, and between the second stage gas liquid separator and the second mixer Connected to a second pressure reducing device, wherein the steam generator is set There is a heat source pipe into which the heat source is passed, and the turbine is used for outputting power to drive the output power of the generator connected thereto, The refrigerating evaporator is used to output a cooling capacity.
A circulation system according to claim 9, wherein said heat source has a temperature between 80 ° C and 250 ° C.
According to claim 9 The circulation system is characterized in that the throttling device is a throttle valve, and the first decompression device and the second decompression device are pressure reducing valves.
An absorption cold power co-feeding method using the circulation system of claim 9, the method comprising the steps of:

a. absorbing the heat of the heat source in the steam generator in the steam generator and generating wet steam of ammonia;

b. Providing the aqueous ammonia wet steam to the first stage gas-liquid separator, and separating the first ammonia-rich vapor and the first liquid ammonia-lean solution by the first-stage gas-liquid separator;

c. supplying the first ammonia-rich vapor to the turbine, and expanding work by the turbine to output mechanical power to drive the generator output power, and Supplying the first liquid ammonia-lean solution to the steam generator via the first passage;

d. Supplying the ammonia-rich wet steam discharged from the turbine to the second-stage gas-liquid separator, and separating the second ammonia-rich vapor and the second liquid-lean ammonia solution by the second-stage gas-liquid separator;

e. supplying the second ammonia-rich vapor to the refrigeration evaporator after being condensed by the condenser and decompressing the throttling device to output a cooling capacity, and the second a liquid ammonia-lean solution is supplied to the absorber via the second passage;

f. supplying ammonia-rich vapor discharged from the refrigeration evaporator to the absorber;

g. supplying an ammonia-lean solution that is not vaporized in the steam generator to the absorber via the reverse passage;

h. passing the aqueous ammonia basic solution formed in the absorber through The circulation pump is pressurized and the regenerator is preheated and supplied to the steam generator via the first mixer.
The method of claim 12 wherein said heat source has a temperature between 80 ° C and 250 ° C.