Ultra-high temperature waste heat steam generation system

Abstract

The present invention provides an ultra-high temperature waste heat steam generation system, comprising: a multi-stream recuperator including a plurality of recuperation pipelines that exchange heat with each other; a compressor unit including a plurality of compression stages connected in sequence, with the inlet of each compression stage connected to the outlet of a recuperation pipeline; a steam generator including a steam generation pipeline and a heat exchange pipeline that exchange heat with each other, the heat exchange pipeline being connected to the last compression stage and the last recuperation pipeline; a multi-stream heat exchanger including a heat source pipeline and a plurality of heat exchange sections that exchange heat with each other, each heat exchange section being connected to a recuperation pipeline; a plurality of liquid separation tanks connected in sequence, the first liquid separation tank being connected to the last recuperation pipeline, the gas outlet of each liquid separation tank being connected to the inlet of a recuperation pipeline, and the liquid outlet of the last liquid separation tank being respectively connected to the inlets of a plurality of heat exchange sections. The ultra-high temperature waste heat steam generation system of the present invention can generate steam of a specific pressure grade, with low steam generation cost and energy consumption, without the use of a steam compressor, the system process is simple, and the waste heat utilization is reasonable.

Description

Technical Field

[0001] The present invention relates to the technical field of energy conservation and environmental protection, and in particular to an ultra-high temperature waste heat steam production system. Background Art

[0002] In process industries such as oil refining and chemical industry, steam with a specific pressure level (e.g., steam with a pressure between 0.3MPa and 0.6MPa) is widely used for heating process materials, such as gas separation propane removal tower, sulfur unit solvent regeneration tower, CO 2 The heat source of reboilers such as regeneration towers and light hydrocarbon separation towers. At present, steam of a specific pressure level in industrial production mainly comes from steam production by fuel boilers (coal boilers, fuel gas boilers, etc.), steam production by steam turbine back pressure and process production. Some steam production is done by electric boilers, which has a high cost. At the same time, there is a large amount of waste heat in process industrial production. Most of this waste heat is below 120°C and is difficult to use directly. Cooling through air coolers and water coolers results in huge energy waste and increases cooling energy consumption.

[0003] Based on the above situation, waste heat steam generation can not only effectively utilize waste heat, but also reduce steam production costs. However, current industrial waste heat steam generation technologies generally have problems such as high steam production costs and energy consumption, and the need to use steam compressors, which leads to complex system processes.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] In view of this, the present invention provides an ultra-high temperature waste heat steam production system, which can produce steam of a specific pressure level, has low steam production cost and energy consumption, does not require the use of a steam compressor, has a simple system process, and reasonably utilizes waste heat.

[0006] According to one aspect of the present invention, there is provided an ultra-high temperature waste heat steam production system, comprising: a multi-stream heat exchanger, comprising a plurality of heat recovery pipes for mutual heat exchange; a compressor unit, comprising a plurality of compression sections connected in sequence, wherein the inlet of each compression section is connected to the outlet of a heat recovery pipe of the multi-stream heat exchanger; a steam generator, comprising a steam production pipe and a heat exchange pipe for mutual heat exchange, wherein the inlet of the heat exchange pipe is connected to the outlet of the last compression section of the compressor unit, and the outlet of the heat exchange pipe is connected to the inlet of the last heat recovery pipe of the multi-stream heat exchanger; a multi-stream heat exchanger , including a heat source pipeline having multiple segments connected in sequence and a plurality of heat exchange sections respectively exchanging heat with the multiple segments of the heat source pipeline, wherein the outlet of each heat exchange section is connected to the inlet of a heat recovery pipeline of the multi-stream heat regenerator; a plurality of liquid separators connected in sequence, wherein the inlet of the first liquid separator is connected to the outlet of the last heat recovery pipeline of the multi-stream heat regenerator, the gas outlet of each liquid separator is connected to the inlet of a heat recovery pipeline of the multi-stream heat regenerator, and the liquid outlet of at least one liquid separator of the last liquid separator is respectively connected to the inlets of the multiple heat exchange sections.

[0007] In some embodiments, the multi-stream heat regenerator includes N heat regenerator pipes, the compressor unit includes N-1 compression stages, the multi-stream heat exchanger includes j heat exchange stages, and the multiple liquid separation tanks include k, j+k+1=N, j, k, and N are positive integers respectively.

[0008] In some embodiments, the temperatures of the multiple heat exchange sections change sequentially, the temperatures of the multi-stage compression sections change sequentially, and the heat exchange sections with lower temperatures are connected to the compression sections with lower temperatures.

[0009] In some embodiments, the inlets of the first few compression stages in the multi-stage compression stage are connected to the outlets of the multiple heat exchange stages via corresponding heat recovery pipelines, and the inlets of the last few compression stages are connected to the gas outlets of the multiple liquid separators via corresponding heat recovery pipelines.

[0010] In some embodiments, the liquid outlet of the last liquid separation tank is divided into multiple paths and connected to multiple heat exchange sections respectively.

[0011] In some embodiments, the multi-stream heat regenerator includes five heat regenerator pipes, the compressor unit includes a four-stage compression section, the multi-stream heat exchanger includes two heat exchange sections, and the multiple liquid separators include two; wherein the outlets from the first heat regenerator pipe to the fourth heat regenerator pipe of the multi-stream heat regenerator are sequentially connected to the inlets from the first-stage compression section to the fourth-stage compression section of the compressor unit, the outlet of the fourth-stage compression section is connected to the inlet of the fifth heat regenerator pipe of the multi-stream heat regenerator via the heat exchange pipe, the outlet of the fifth heat regenerator pipe is connected to the inlet of the first liquid separator, and the gas outlet of the first liquid separator is connected to the inlet of the first liquid separator via the heat exchange pipe. The fourth heat recovery pipeline is connected to the inlet of the fourth-stage compression section and the liquid outlet is connected to the inlet of the second liquid separator tank. The gas outlet of the second liquid separator tank is connected to the inlet of the third-stage compression section of the compressor unit via the third heat recovery pipeline of the multi-stream heat regenerator and the liquid outlet is divided into two paths and respectively connected to the inlets of the two heat exchange sections. The outlet of the high-temperature heat exchange section of the two heat exchange sections is connected to the inlet of the second-stage compression section of the compressor unit via the second heat recovery pipeline of the multi-stream heat regenerator, and the outlet of the low-temperature heat exchange section of the two heat exchange sections is connected to the inlet of the first-stage compression section via the first heat recovery pipeline.

[0012] In some embodiments, the ultra-high temperature waste heat steam production system further includes: a throttling expansion valve, which is respectively arranged at the inlet of each liquid separation tank and the inlet of each heat exchange section.

[0013] In some embodiments, the water inlet of the steam production pipeline is steam condensate or deoxygenated water, and the steam pressure output by the steam production pipeline is 0.2 MPag to 0.6 MPag.

[0014] In some embodiments, the inlet water of the heat source pipeline is heat medium water, the inlet water temperature of the heat source pipeline is 80°C to 110°C, and the outlet water temperature is 50°C to 80°C.

[0015] In some embodiments, the working fluid of the compressor unit is one or more of 1-chloro-3,3,3-trifluoropropene, pentane, isopentane, ethylene oxide, and propylene oxide.

[0016] The beneficial effects of the present invention compared with the prior art include at least:

[0017] Through the multi-stream heat exchanger, multi-stage evaporation and cascade utilization of waste heat are realized, making waste heat utilization more reasonable. Through the compressor unit, multi-stage compression of high-temperature working fluid is realized; the inlet of each compression section of the compressor unit is connected to the outlet of a heat recovery pipeline of the multi-stream heat exchanger to realize inter-stage air replenishment and enthalpy increase. Under the same heating capacity, the compressor unit has lower energy consumption, ensuring that the inlet temperature of each compression section is reasonable, preventing liquid hammer, and ensuring the reliable operation of the compressor unit; and the multi-stream heat exchanger integrates multiple heat recovery pipelines, which greatly reduces the equipment footprint and has a more compact structure. Through the outlet of each heat exchange section of the multi-stream heat exchanger and the gas outlet of each liquid separation tank, the inlet of a heat recovery pipeline of the multi-stream heat exchanger is respectively connected, and the last compression section of the compressor unit is connected to the last heat recovery pipeline of the multi-stream heat exchanger through the heat exchange pipeline of the steam generator. In the multi-stream heat exchanger, each heat recovery pipeline provides working fluid with appropriate temperature to each compression section of the compressor unit through mutual heat exchange, and the steam production pipeline of the steam generator produces appropriate steam. In addition, the liquid separator tank plays a role of throttling expansion, and the liquid outlet of at least one liquid separator tank including the last liquid separator tank is respectively connected to the inlets of multiple heat exchange sections, so that pipeline circulation can be achieved without setting too many liquid separator tanks.

[0018] The ultra-high temperature waste heat steam production system of the present invention cooperates with a multi-stream heat exchanger, a multi-stream heat regenerator, a compressor unit, a steam generator, and a liquid separator. Based on the principle of waste heat cascade utilization and reverse Carnot cycle, it fully recovers and utilizes the waste heat of the heat source. It can continuously produce 0.2MPag to 0.6MPag of steam, with low steam production cost and energy consumption, significant energy-saving benefits, and no need to use a steam compressor. The system process is simple and the waste heat utilization is reasonable.

[0019] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present invention, and together with the specification are used to explain the principles of the present invention. Obviously, the accompanying drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0021] Figure 1 A schematic structural diagram of an ultra-high temperature waste heat steam generation system according to an embodiment of the present invention is shown;

[0022] Figure 2 A schematic diagram of medium flow in an ultra-high temperature waste heat steam production system in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0023] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments described herein. Instead, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art.

[0024] The accompanying drawings are only schematic illustrations of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings represent the same or similar parts, and thus their repeated description will be omitted.

[0025] The words "first", "second" and the like used in the specific description do not indicate any order, quantity or importance, but are only used to distinguish different components. The term "plurality" means two or more, unless otherwise clearly and specifically defined. In addition, in the description of the present invention, when it is said that a device is "connected" to another device, this includes not only the case of direct connection, but also the case of indirect connection through other elements.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and features in different embodiments may be combined with each other.

[0027] Figure 1 The structure of the ultra-high temperature waste heat steam generation system is shown in Figure 1. Figure 1 As shown, the ultra-high temperature waste heat steam generation system provided by the embodiment of the present invention includes:

[0028] The multi-stream regenerator 10 includes a plurality of regenerator pipes for exchanging heat with each other;

[0029] The compressor unit 20 comprises a plurality of compression sections connected in sequence, wherein the inlet of each compression section is connected to the outlet of a heat recovery pipeline of the multi-stream heat regenerator 10;

[0030] The steam generator 30 includes a steam production pipeline 31 and a heat exchange pipeline 32 for heat exchange. The inlet of the heat exchange pipeline 32 is connected to the outlet of the last compression section of the compressor unit 20, and the outlet of the heat exchange pipeline 32 is connected to the inlet of the last heat regeneration pipeline of the multi-stream regenerator 10.

[0031] The multi-stream heat exchanger 40 comprises a plurality of sequentially connected segmented heat source pipelines 41 and a plurality of heat exchange sections respectively exchanging heat with the plurality of segments of the heat source pipeline 41, wherein the outlet of each heat exchange section is connected to the inlet of a heat regeneration pipeline of the multi-stream regenerator 10;

[0032] A plurality of separatory tanks are connected in sequence, wherein the inlet of the first separatory tank 50a is connected to the outlet of the last heat recovery pipeline of the multi-stream heat regenerator 10, the gas outlet of each separatory tank is connected to the inlet of a heat recovery pipeline of the multi-stream heat regenerator 10, and the liquid outlet of at least one separatory tank including the last separatory tank is respectively connected to the inlets of a plurality of heat exchange sections.

[0033] Among them, the multi-stage compression sections connected in sequence refer to the connection between the outlet of the previous compression section and the inlet of the next compression section. The last heat recovery pipeline refers to a heat recovery pipeline that is different from the heat recovery pipelines connected to the multi-stage compression sections. The segments connected in sequence refer to the heat source pipeline 41 in which the outlet of the previous segment is connected to the inlet of the next segment to form an integrally connected one. The multiple heat exchange sections that respectively exchange heat with the multiple segments of the heat source pipeline 41 are independent of each other and are not connected. The multiple liquid separation tanks connected in sequence refer to the connection between the liquid outlet of the previous liquid separation tank and the inlet of the next liquid separation tank. The liquid outlet of at least one liquid separation tank including the last liquid separation tank includes the following scenarios: the liquid outlet of the last liquid separation tank, the liquid outlet of the last liquid separation tank and the previous liquid separation tank, and the liquid outlet of the last liquid separation tank and the previous liquid separation tanks.

[0034] The ultra-high temperature waste heat steam production system of the present invention realizes multi-stage evaporation and cascade utilization of waste heat through the multi-stream heat exchanger 40, making waste heat utilization more reasonable. Multi-stage compression of high-temperature working fluid is realized through the compressor unit 20; the inlet of each compression stage of the compressor unit 20 is connected to the outlet of a heat recovery pipeline of the multi-stream heat exchanger 10 to realize inter-stage air replenishment and enthalpy increase. Under the same heating capacity, the compressor unit 20 has lower energy consumption, ensuring that the intake temperature of each compression stage is reasonable, preventing liquid hammer, and ensuring the reliable operation of the compressor unit 20; and the multi-stream heat exchanger 10 integrates multiple heat recovery pipelines, which greatly reduces the equipment footprint and has a more compact structure. The outlet of each heat exchange section of the multi-stream heat exchanger 40 and the gas outlet of each liquid separator are respectively connected to the inlet of a heat recovery pipeline of the multi-stream heat exchanger 10, and the last compression section of the compressor unit 20 is connected to the last heat recovery pipeline of the multi-stream heat exchanger 10 through the heat exchange pipeline 32 of the steam generator 30. In the multi-stream heat exchanger 10, each heat recovery pipeline provides a working medium with a suitable temperature to each compression section of the compressor unit 20 through mutual heat exchange, and the steam production pipeline 31 of the steam generator 30 produces suitable steam. In addition, the liquid separator plays a role of throttling expansion, and the liquid outlets of at least one liquid separator including the last liquid separator are respectively connected to the inlets of multiple heat exchange sections, so that pipeline circulation can be achieved without setting too many liquid separators.

[0035] The ultra-high temperature waste heat steam production system of the present invention utilizes a multi-stream heat exchanger 40, a multi-stream heat regenerator 10, a compressor unit 20, a steam generator 30, and a liquid separator, based on the waste heat cascade utilization and reverse Carnot cycle principle, to fully recover and utilize the waste heat of the heat source, and can continuously produce 0.2MPag to 0.6MPag of steam, with low steam production cost and energy consumption, significant energy-saving benefits, and no need to use a steam compressor. The system process is simple and the waste heat utilization is reasonable.

[0036] Compared with traditional fuel boilers or electric heating steam production technology, the steam production cost and energy consumption of the present invention are greatly reduced, and the energy saving and carbon reduction benefits are significant. Compared with the traditional combined high-temperature heat pump technology, the present invention can directly produce 0.2MPag to 0.6MPag steam, with a steam production temperature of 133.5℃ to 165℃, and realize direct steam production from ultra-high temperature waste heat, without the need for a steam compressor, and the system process is more simplified, and the waste heat utilization is more reasonable.

[0037] In some embodiments, the multi-stream heat regenerator 10 includes N heat regenerator pipes, the compressor unit 20 includes N-1 compression stages, the multi-stream heat exchanger 40 includes j heat exchange stages, and the plurality of liquid separation tanks includes k, j+k+1=N, j, k, and N are positive integers, and specific values ​​can be set as needed. For example, N=5, j=2, and k=2, but this is not limited thereto.

[0038] In some embodiments, the temperatures of multiple heat exchange sections change sequentially, the temperatures of multiple compression sections change sequentially, and the heat exchange section with the lower temperature is connected to the compression section with the lower temperature. That is, the heat exchange section with the lowest temperature is connected to the compression section with the lowest temperature, the heat exchange section with the second lowest temperature is connected to the compression section with the second lowest temperature, and the heat exchange section with the highest temperature is connected to the compression section with the highest temperature, so that the intake and replenishment air of each compression section match their compression temperatures, thereby improving the overall compression efficiency and operation stability of the compressor unit 20.

[0039] In some embodiments, the inlets of the first several compression stages in the multi-stage compression stage are connected to the outlets of the multiple heat exchange stages through corresponding heat recovery pipelines, and the inlets of the last several compression stages are connected to the gas outlets of the multiple liquid separators through corresponding heat recovery pipelines. In this way, the heat recovery pipelines in the multi-stream heat regenerator 10 provide working fluids with suitable temperatures to the various compression stages of the compressor unit 20 through mutual heat exchange.

[0040] In some embodiments, the liquid outlet of the last liquid separator tank is divided into multiple paths and connected to multiple heat exchange sections respectively, so that pipeline circulation can be achieved without setting up too many liquid separator tanks.

[0041] In some embodiments, the multi-stream heat regenerator 10 includes five heat regenerator pipes, the compressor unit 20 includes four compression sections, the multi-stream heat exchanger 40 includes two heat exchange sections, and the multi-stream heat exchanger includes two liquid separators. The outlets of the first heat regenerator pipe 10a to the fourth heat regenerator pipe 10d of the multi-stream heat regenerator 10 are connected to the inlets of the first compression section 20a to the fourth compression section 20d of the compressor unit 20 in sequence, the outlet of the fourth compression section 20d is connected to the inlet of the fifth heat regenerator pipe 10e of the multi-stream heat regenerator 10 via the heat exchange pipe 32, the outlet of the fifth heat regenerator pipe 10e is connected to the inlet of the first liquid separator 50a, the gas outlet of the first liquid separator 50a is connected to the inlet of the fourth compression section 20d via the fourth heat regenerator pipe 10d, and the liquid outlet is connected to the inlet of the second liquid separator 50b. The gas outlet of the second liquid separator 50b is connected to the inlet of the third compression section 20c of the compressor unit 20 through the third heat recovery pipeline 10c of the multi-stream heat regenerator 10, and the liquid outlet is divided into two paths and respectively connected to the inlets of two heat exchange sections (including the high-temperature heat exchange section 42a and the low-temperature heat exchange section 42b). The outlet of the high-temperature heat exchange section 42a of the two heat exchange sections is connected to the inlet of the second compression section 20b of the compressor unit 20 through the second heat recovery pipeline 10b of the multi-stream heat regenerator 10, and the outlet of the low-temperature heat exchange section 42b of the two heat exchange sections is connected to the inlet of the first compression section 20a through the first heat recovery pipeline 10a.

[0042] In some embodiments, the ultra-high temperature waste heat steam production system further includes: a throttling expansion valve, which is respectively arranged at the inlet of each liquid separator and at the inlet of each heat exchange section. Specifically, the throttling expansion valve may include: a first throttling expansion valve 61, which is arranged at the inlet of the first liquid separator 50a; a second throttling expansion valve 62, which is arranged at the inlet of the second liquid separator 50b; a third throttling expansion valve 63, which is arranged at the inlet of the high temperature heat exchange section 42a; and a fourth throttling expansion valve 64, which is arranged at the inlet of the low temperature heat exchange section 42b.

[0043] Figure 2 The medium flow process in the ultra-high temperature waste heat steam generation system is shown in figure. Figure 1 and Figure 2 As shown in the figure, the process flow of the ultra-high temperature waste heat steam generation system includes:

[0044] The first-stage compressed air intake S-1 (high-temperature working medium) of the first-stage compression section 20a of the compressor unit 20 comes from the first heat recovery pipeline 10a of the multi-stream heat regenerator 10. The gas S-2 compressed by the first-stage compression section 20a merges with the second-stage compressed air supplement S-3 from the second heat recovery pipeline 10b to form a mixed gas S-4, which enters the second-stage compression section 20b; the gas S-5 compressed by the second-stage compression section 20b merges with the third-stage compressed air supplement S-6 from the third heat recovery pipeline 10c to form a mixed gas S-7, which enters the third-stage compression section 20c; the gas S-8 compressed by the third-stage compression section 20c merges with the fourth-stage compressed air supplement S-9 from the fourth heat recovery pipeline 10d to form a mixed gas S-10, which enters the fourth-stage compression section 20d, and the gas S-11 compressed by the fourth-stage compression section 20d becomes a high-temperature and high-pressure gas phase working medium.

[0045] The high-temperature and high-pressure gaseous working medium enters the steam generator 30 and exchanges heat with the steam-producing water inlet S-28 entering the steam generator 30. The high-temperature and high-pressure gaseous working medium condenses and releases heat to become the high-temperature liquid-phase working medium S-12. The steam-producing water inlet S-28 absorbs heat and evaporates to continuously produce steam S-29 of the set pressure for output.

[0046] The high-temperature liquid phase working medium S-12 enters the fifth heat recovery pipe 10e of the multi-stream heat regenerator 10, and its temperature decreases after cooling and releasing heat, preheating the first-stage compressed air intake S-1, the second-stage compressed air supplement S-3, the third-stage compressed air supplement S-6 and the fourth-stage compressed air supplement S-9 to the set temperature.

[0047] The cooled high-temperature working medium S-13 is throttled and depressurized to working medium S-14 through the first throttling expansion valve 61, and then enters the first liquid separator 50a. The gaseous working medium S-15 discharged from the gas outlet of the first liquid separator 50a enters the fourth heat recovery pipeline 10d of the multi-stream regenerator, and enters the fourth-stage compression section 20d as the fourth-stage compression supplementary gas S-9 after preheating. The liquid-phase working medium S-16 discharged from the bottom liquid outlet of the first liquid separator 50a is throttled and depressurized to working medium S-17 through the second throttling expansion valve 62, and then enters the second liquid separator 50b. The gaseous working medium S-18 discharged from the gas outlet of the second liquid separator 50b enters the third heat recovery pipeline 10c of the multi-stream regenerator, and enters the third-stage compression section 20c as the third-stage compression supplementary gas S-6 after preheating.

[0048] The liquid phase working medium S-19 discharged from the liquid outlet at the bottom of the second liquid separator 50b is divided into two paths. One path S-20 is throttled and reduced in pressure to working medium S-21 by the third throttling expansion valve 63, and then enters the high-temperature heat exchange section 42a of the multi-stream heat exchanger 40 to exchange heat with the heat source inlet water S-26 entering the multi-stream heat exchanger 40, and the high-temperature working medium S-21 is heated and evaporated into gas phase working medium S-22, which enters the second heat recovery pipeline 10b of the multi-stream heat exchanger 10, and after preheating, enters the second-stage compression replenishment gas S-3. The other path S-23 is throttled and reduced in pressure to the working medium S-24 by the fourth throttling expansion valve 64, and then enters the low-temperature heat exchange section 42b of the multi-stream heat exchanger 40, and exchanges heat with the heat source after the heat exchange in the high-temperature heat exchange section 42a. The heat source outlet water S-27 after the heat exchange is output, and the high-temperature working medium S-24 is heated and evaporated into the gas phase working medium S-25, and enters the first heat recovery pipeline 10a of the multi-stream heat regenerator 10. After preheating, it enters the first-stage compression section 20a as the first-stage compressed intake air S-1, forming a circulation of the entire system.

[0049] The steam inlet water S-28 can use steam condensate or deoxygenated water, and deoxygenated water is recommended. The pressure of the output steam S-29 is 0.2MPag to 0.6MPag, which can be adjusted according to production requirements. The temperature of steam S-29 can reach 133.5℃ to 165℃.

[0050] The heat source can be heat medium water or other suitable heat sources. The temperature of the heat source inlet water S-26 is 80℃ to 110℃, and the temperature of the heat source outlet water S-27 is 50℃ to 80℃, which can be adjusted according to production requirements.

[0051] The working fluids of the compressor unit 20 are recommended to be: 1-chloro-3,3,3-trifluoropropene (R1233zd), pentane (R601), isopentane (R601a), ethylene oxide, propylene oxide, and a single component or a mixed working fluid of the above components can be used. These working fluids are all high-performance working fluids with a GWP (global warming potential) not exceeding 50, have good environmental protection, and realize an explosion-proof ultra-high temperature waste heat steam production system, solve the problem of flammable and explosive application risks of working fluids, and make the application range of the ultra-high temperature waste heat steam production system of the present invention wider.

[0052] The explosion-proof ultra-high temperature waste heat steam production system provided by the present invention adopts two-stage evaporation of waste heat, four-stage compression of high-temperature working fluid, inter-stage air supplementation and enthalpy increase and reverse Carnot cycle waste heat steam production technology, inputs heat medium water, fully recovers and utilizes the waste heat of heat medium water, and continuously produces 0.2MPag to 0.6MPag of steam. The steam production temperature reaches 133.5℃ to 165℃, realizing direct steam production from ultra-high temperature waste heat, with significant energy-saving benefits.

[0053] To facilitate understanding of the present invention, examples are listed below. Those skilled in the art should understand that the following examples are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0054] Case 1 to Case 5 respectively give the steam energy consumption and cost under the conditions of heat medium water inlet 95℃, heat medium water outlet 70℃, output steam pressure 0.2MPag to 0.6MPag, and steam temperature 133.5℃ to 165℃, and compare the energy consumption and cost of conventional boilers and electric heating steam production. The energy price is 0.6 yuan / kW for electricity and 200 yuan / t for steam. The energy discount coefficient is 0.23 for electricity and 66 for steam, as shown in the following table.

[0055]

[0056] The ultra-high temperature waste heat steam production system of the present invention can continuously produce steam of 0.2MPag to 0.6MPag, and the electricity consumption per ton of steam is 162.9kW / t to 288.4kW / t, which is equivalent to steam cost and energy consumption of 97.74 yuan / t to 173.04 yuan / t and 27.47kgEO / t to 66.33kgEO / t, respectively. Compared with boiler steam production, the present invention has cost and energy consumption advantages in the steam range of 0.2MPag to 0.5MPag, and the energy consumption is basically the same at 0.6MPag, and the cost still has certain advantages; compared with electric heating steam production, the present invention has obvious cost and energy consumption advantages in the steam range of 0.2MPag to 0.6MPag.

[0057] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. An ultra-high temperature waste heat steam generation system, characterized in that: include: A multi-stream regenerator includes a plurality of regenerator pipes for exchanging heat with each other; A compressor unit, comprising a plurality of compression sections connected in sequence, wherein an inlet of each compression section is connected to an outlet of a heat recovery pipeline of the multi-stream heat regenerator; A steam generator, comprising a steam production pipeline and a heat exchange pipeline for heat exchange, wherein the inlet of the heat exchange pipeline is connected to the outlet of the last compression stage of the compressor unit, and the outlet of the heat exchange pipeline is connected to the inlet of the last heat regenerator pipeline of the multi-stream regenerator; A multi-stream heat exchanger, comprising a plurality of sequentially connected segmented heat source pipelines and a plurality of heat exchange sections respectively exchanging heat with the plurality of segments of the heat source pipeline, wherein the outlet of each heat exchange section is connected to the inlet of a heat regenerator pipeline of the multi-stream heat regenerator; A plurality of liquid separators connected in sequence, wherein the inlet of the first liquid separator is connected to the outlet of the last heat recovery pipeline of the multi-stream heat regenerator, the gas outlet of each liquid separator is connected to the inlet of a heat recovery pipeline of the multi-stream heat regenerator, and the liquid outlet of at least one liquid separator including the last liquid separator is respectively connected to the inlets of the plurality of heat exchange sections; Wherein, the multi-stream heat regenerator includes five heat regenerator pipes, the compressor unit includes a four-stage compression section, the multi-stream heat exchanger includes two heat exchange sections, and the multiple liquid separators include two; the outlets of the first heat regenerator pipe to the fourth heat regenerator pipe are connected to the inlets of the first-stage compression section to the fourth-stage compression section of the compressor unit in sequence, the outlet of the fourth-stage compression section is connected to the inlet of the fifth heat regenerator pipe of the multi-stream heat regenerator via the heat exchange pipe, the outlet of the fifth heat regenerator pipe is connected to the inlet of the first liquid separator, and the gas outlet of the first liquid separator is connected to the inlet of the first liquid separator via the fourth-stage compression section. A heat recovery pipeline is connected to the inlet of the fourth-stage compression section and the liquid outlet is connected to the inlet of the second liquid separator tank. The gas outlet of the second liquid separator tank is connected to the inlet of the third-stage compression section of the compressor unit through the third heat recovery pipeline of the multi-stream heat regenerator and the liquid outlet is divided into two paths and respectively connected to the inlets of the two heat exchange sections. The outlet of the high-temperature heat exchange section of the two heat exchange sections is connected to the inlet of the second-stage compression section of the compressor unit through the second heat recovery pipeline of the multi-stream heat regenerator, and the outlet of the low-temperature heat exchange section of the two heat exchange sections is connected to the inlet of the first-stage compression section through the first heat recovery pipeline.

2. The ultra-high temperature waste heat steam generation system according to claim 1, characterized in that: The multi-stream heat regenerator includes N heat regenerator pipelines, the compressor unit includes N-1 compression stages, the multi-stream heat exchanger includes j heat exchange stages, the multiple liquid separation tanks include k, j+k+1=N, j, k, and N are positive integers respectively.

3. The ultra-high temperature waste heat steam generation system according to claim 1, characterized in that: The temperatures of the multiple heat exchange sections change sequentially, the temperatures of the multi-stage compression sections change sequentially, and the heat exchange sections with lower temperatures are connected to the compression sections with lower temperatures.

4. The ultra-high temperature waste heat steam generation system according to claim 1, characterized in that: The inlets of the first several compression stages in the multi-stage compression stage are connected to the outlets of the multiple heat exchange stages via corresponding heat recovery pipelines, and the inlets of the last several compression stages are connected to the gas outlets of the multiple liquid separators via corresponding heat recovery pipelines.

5. The ultra-high temperature waste heat steam generation system according to claim 1, characterized in that: The liquid outlet of the last liquid separation tank is divided into multiple paths and respectively connected to the multiple heat exchange sections.

6. The ultra-high temperature waste heat steam generation system according to claim 1, characterized in that: Also includes: The throttling expansion valve is respectively arranged at the inlet of each liquid separation tank and the inlet of each heat exchange section.

7. The ultra-high temperature waste heat steam generation system according to claim 1, characterized in that: The water inlet of the steam production pipeline is steam condensate or deoxygenated water, and the steam pressure output by the steam production pipeline is 0.2MPag to 0.6MPag.

8. The ultra-high temperature waste heat steam generation system according to claim 1, characterized in that: The inlet water of the heat source pipeline is heat medium water, the inlet water temperature of the heat source pipeline is 80°C to 110°C, and the outlet water temperature is 50°C to 80°C.

9. The ultra-high temperature waste heat steam generation system according to claim 1, characterized in that: The working fluid of the compressor unit is one or more of 1-chloro-3,3,3-trifluoropropene, pentane, isopentane, ethylene oxide, and propylene oxide.

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