CN112082398A - Induced injection type waste heat step recovery device based on predictive control - Google Patents
Induced injection type waste heat step recovery device based on predictive control Download PDFInfo
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- CN112082398A CN112082398A CN202010934329.0A CN202010934329A CN112082398A CN 112082398 A CN112082398 A CN 112082398A CN 202010934329 A CN202010934329 A CN 202010934329A CN 112082398 A CN112082398 A CN 112082398A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C3/00—Other direct-contact heat-exchange apparatus
- F28C3/02—Other direct-contact heat-exchange apparatus the heat-exchange media both being gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
- F22B3/04—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators
- F22B3/045—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators the drop in pressure being achieved by compressors, e.g. with steam jet pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0014—Recuperative heat exchangers the heat being recuperated from waste air or from vapors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
Abstract
The invention discloses an induced injection type waste heat step recovery device based on predictive control.A steam inlet of a steam temperature and pressure reducing device is communicated with a main steam pipeline; the first unit comprises first heat exchange equipment, first flash equipment and a first steam jet pump; a steam inlet of the first heat exchange equipment is communicated with a steam outlet of the steam temperature and pressure reduction device; a high-temperature condensed water inlet of the first flash equipment is communicated with a high-temperature condensed water outlet of the first heat exchange equipment; the first end of the first steam jet pump is communicated with a steam outlet of the first flash evaporation equipment; the second end of the first steam jet pump is communicated with the main steam pipeline; the second unit comprises second heat exchange equipment; and the steam inlet of the second heat exchange device is communicated with the third end of the first steam jet pump. The invention can recover the steam after flash evaporation at all levels, and can adjust the temperature and the pressure of the recovered steam to the state required by production, thereby effectively meeting the production and processing requirements of enterprises.
Description
Technical Field
The invention relates to the technical field of steam recovery devices, in particular to an induction injection type waste heat step recovery device based on predictive control.
Background
In the production process of enterprises such as printing and dyeing, textile, papermaking, chemical fiber, food and the like, high-temperature condensed water or low-pressure exhaust steam which can not meet the use of process parameters cannot be generated. Since there is no route of use, the initial treatment is direct discharge to the environment. At present, the national and international standards prohibit the condensate water with the temperature higher than 43 ℃ from being discharged into the land, because the high-temperature condensate water with the temperature higher than 43 ℃ can kill bacteria, microorganisms and the like in the soil, damage the ecological balance and easily cause soil hardening. The low-pressure exhaust steam can generate white pollution to the atmosphere and increase the greenhouse effect.
At present, under the policy situation of energy conservation and emission reduction, waste heat recovery technologies for emissions such as high-temperature condensed water with different temperatures and low-pressure exhaust steam with different pressures and temperatures generated by different working conditions of enterprises are more and more concerned by domestic and foreign scholars and enterprises. The first method is to use high temperature condensed water for washing, heating, etc. and low pressure exhausted steam for steam tracing or boiler oxygen elimination, etc. The heat of the emissions is not utilized efficiently and the process is wasteful of energy and resources. In the industrial production process, the steam meeting the requirements of working conditions can be directly utilized, and the high-temperature condensed water has one more treatment process than the low-pressure exhaust steam. With the development of the technology, the currently common method is to perform pressure drop on high-temperature condensed water in a closed flash tank to perform secondary evaporation and separate gas phase and liquid phase. However, the temperature of the steam discharged after the flash evaporation is higher, but the pressure is lower, so that the requirements of industrial enterprises such as printing and dyeing, textile, papermaking, chemical fiber and food cannot be met. The conventional treatment is to cool the steam in a reservoir to a standard temperature that allows for venting, and then vent to the environment. The above operation causes complete loss of heat contained in the steam, which severely wastes energy.
Disclosure of Invention
In view of the above technical problems, the present invention aims to: the induction injection type waste heat step recovery device based on predictive control can recycle steam after flash evaporation at all levels, can adjust the temperature and the pressure of the recovered steam to the required state for production, and effectively meets the production and processing requirements of enterprises.
The technical solution of the invention is realized as follows: an induced injection type waste heat step recovery device based on predictive control comprises a steam main pipeline, a steam temperature and pressure reducing device, a first unit and a second unit;
the steam temperature and pressure reducing device is provided with a steam inlet and a steam outlet; the steam inlet of the steam temperature and pressure reducing device is communicated with the main steam pipeline;
the first unit comprises first heat exchange equipment, first flash equipment and a first steam jet pump; the first heat exchange equipment is provided with a steam inlet and a high-temperature condensed water outlet; the steam inlet of the first heat exchange device is communicated with the steam outlet of the steam temperature and pressure reducing device; the first flash evaporation equipment is provided with a high-temperature condensed water inlet and a steam outlet; a high-temperature condensed water inlet of the first flash equipment is communicated with a high-temperature condensed water outlet of the first heat exchange equipment; the first steam jet pump is provided with a first end, a second end and a third end; the first end of the first steam jet pump is communicated with a steam outlet of the first flash device; the second end of the first steam jet pump is communicated with the main steam pipeline;
the second unit comprises second heat exchange equipment; the second heat exchange equipment is provided with a steam inlet; and the steam inlet of the second heat exchange device is communicated with the third end of the first steam jet pump.
Further, the second unit comprises a second flash apparatus and a second vapor jet pump; a high-temperature condensed water outlet is formed in the second heat exchange device; the second flash evaporation equipment is provided with a high-temperature condensed water inlet and a steam outlet; the high-temperature condensed water inlet of the second flash evaporation equipment is communicated with the high-temperature condensed water outlet of the second heat exchange equipment; the second steam jet pump is provided with a first end, a second end and a third end; the first end of the second steam jet pump is communicated with a steam outlet of the second flash evaporation equipment; the second end of the second steam jet pump is communicated with the steam main pipeline;
the waste heat step recovery device comprises a third unit; the third unit comprises third heat exchange equipment; the third heat exchange device is provided with a steam inlet; and the steam inlet of the third heat exchange device is communicated with the third end of the second steam jet pump.
Further, the third unit comprises a third flash apparatus and a third vapor jet pump; a high-temperature condensed water outlet is formed in the third heat exchange device; the third flash evaporation equipment is provided with a high-temperature condensed water inlet and a steam outlet; a high-temperature condensed water inlet of the third flash evaporation equipment is communicated with a high-temperature condensed water outlet of the third heat exchange equipment; the third steam jet pump is provided with a first end, a second end and a third end; the first end of the third steam jet pump is communicated with a steam outlet of the third flash evaporation equipment; the second end of the third steam jet pump is communicated with the main steam pipeline; the waste heat step recovery device comprises a steam collecting box; and the third end of the third steam jet pump is communicated with the steam collecting box.
Further, high-temperature condensed water outlets are formed in the first flash evaporation equipment and the second flash evaporation equipment; and the high-temperature condensed water outlet of the first flash evaporation equipment and the high-temperature condensed water outlet of the second flash evaporation equipment are respectively communicated with the high-temperature condensed water inlet of the third flash evaporation equipment.
Further, the waste heat step recovery device comprises a PLC controller; the PLC is respectively connected with the first steam jet pump, the second steam jet pump and the third steam jet pump.
Further, a low-temperature condensed water outlet is formed in the third flash evaporation equipment; the waste heat step recovery device comprises a water storage tank; and the water storage tank is communicated with a low-temperature condensed water outlet of the third flash evaporation equipment.
Furthermore, a high-temperature condensed water outlet of the first heat exchange device is communicated with a high-temperature condensed water inlet of the first flash evaporation device, a high-temperature condensed water outlet of the second heat exchange device is communicated with a high-temperature condensed water inlet of the second flash evaporation device, and a high-temperature condensed water outlet of the third heat exchange device is communicated with a high-temperature condensed water inlet of the third flash evaporation device through connecting pipelines; a drainage system is arranged on the connecting pipeline; the drainage system comprises an automatic switch valve body and a manual switch valve body; the automatic switch valve body and the manual switch valve body are arranged on the connecting pipeline in parallel.
Furthermore, the steam temperature value and the steam pressure value in the first heat exchange device, the second heat exchange device and the third heat exchange device are different, and the steam temperature value and the steam pressure value are reduced in sequence.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the main steam pipeline for maintaining the initial steam discharge state is additionally arranged, the main steam pipeline is communicated with all stages of steam jet pumps, and the steam after flash evaporation from all stages of flash evaporation equipment can be effectively mixed with the steam of the main steam pipeline through the matching use of all stages of steam jet pumps, so that the temperature and the pressure of the mixed steam can be improved, and the steam state required by the subsequent production process can be effectively met. The steam heat after the flash evaporation is effectively recycled, and the waste of heat is avoided.
2. The invention can adjust the temperature and the pressure of the mixed steam into the state required by production according to the actual production requirement, thereby providing multistage steam with different temperature and pressure values and effectively meeting the steam consumption requirements of different types of heat exchange equipment.
Drawings
The technical scheme of the invention is further explained by combining the accompanying drawings as follows:
FIG. 1 is a schematic diagram of the operation of the present invention;
FIG. 2 is a schematic diagram of the structure of the hydrophobic system of the present invention;
FIG. 3 is an enlarged view of FIG. 1 at A;
wherein: 1. a main steam pipeline; 2. a steam temperature and pressure reducing device; 3. a first heat exchange device; 31. a first flash device; 32. a first vapor jet pump; 4. a second heat exchange unit; 41. a second flash apparatus; 42. a second vapor jet pump; 5. a third heat exchange unit; 51. a third flash apparatus; 52. a third vapor jet pump; 521. a first end; 522. a second end; 523. a third end; 6. connecting a pipeline; 61. a hydrophobic system; 611. automatically opening and closing the valve body; 612. a manual switch valve body; 7. a water storage tank; 71. a water pump; 8. and a steam collecting box.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Fig. 1 to 3 show an induced injection type waste heat step recovery device based on predictive control, which comprises a main steam pipeline 1, a steam temperature and pressure reducing device 2, a first unit and a second unit. 3.5Mpa of superheated steam is introduced into the main steam pipeline 1. The steam temperature and pressure reducing device 2 is a temperature and pressure reducing device in the prior art, and a steam inlet and a steam outlet are processed on the steam temperature and pressure reducing device 2. The steam inlet of the steam temperature and pressure reducing device 2 is communicated with the main steam pipeline 1, so that the superheated steam in the main steam pipeline can enter the steam temperature and pressure reducing device 2 and come out from the steam outlet of the steam temperature and pressure reducing device 2.
The first unit described above comprises a first heat exchange means 3, a first flash means 31 and a first vapour jet pump 32. The first heat exchange device 3 is used for heat exchange to convert the heat in the steam into the energy required by production. The first heat exchange means 3 may be a coil structure as in the prior art. The first heat exchange device 3 is formed with a steam inlet and a high-temperature condensed water outlet. The steam inlet of the first heat exchange device 3 is communicated with the steam outlet of the steam temperature and pressure reducing device 2. The steam with reduced temperature and pressure can enter the first heat exchange device 3 from the steam inlet of the first heat exchange device 3. The first flash device 31 is a flash tank structure, which is a conventional device in the prior art and is not described in detail. The first flash device 31 is formed with a high-temperature condensed water inlet and a steam outlet. The high-temperature condensed water inlet of the first flash device 31 is communicated with the high-temperature condensed water outlet of the first heat exchange device 3. The steam is heat exchanged by the first heat exchange device 3 to generate a mixture of high-temperature condensed water and steam, and the mixture enters the first flash device 31 through the high-temperature condensed water inlet of the first flash device 31 to be flashed. The first vapor jet pump 32 is conventional in the art, and the first vapor jet pump 32 has a first end, a second end, and a third end. The first end and the second end are inlet ends, and the third end is an outlet end. A first end of the first steam jet pump 32 communicates with a steam outlet of the first flash device 31. A second end of the first steam jet pump 32 communicates with the main steam conduit 1.
The second unit comprises a second heat exchange means 4. The second heat exchange means 4 functions in the same way as the first heat exchange means 3. The second heat exchange device 4 is provided with a steam inlet. The steam inlet of the second heat exchange device 4 is communicated with the third end of the first steam jet pump 32. When the first steam jet pump 32 works, the steam after flashing in the first flash device 31 is led out from a steam outlet of the first flash device 31, the steam after flashing is induced by the negative pressure generated by the work of the first steam jet pump 32 to the superheated steam in the main steam pipeline 1, the steam after flashing and the superheated steam are mixed in a mixing chamber of the first steam jet pump 32, and the mixed steam is led out from a third end of the first steam jet pump 32 and enters the second heat exchange device 4 to be used by the second heat exchange device 4.
On the basis of the above, the second unit includes the second flash apparatus 41 and the second vapor jet pump 42. A high-temperature condensed water outlet is formed on the second heat exchange device 4. The second flash apparatus 41 is formed with a high temperature condensed water inlet and a steam outlet. The high-temperature condensed water inlet of the second flash evaporation device 41 is communicated with the high-temperature condensed water outlet of the second heat exchange device 4. The second vapor jet pump 42 is formed with a first end, a second end and a third end. A first end of the second vapor jet pump 42 communicates with the vapor outlet of the second flash device 41. A second end of the second steam jet pump 42 communicates with the main steam conduit 1. The waste heat step recovery device of the embodiment comprises a third unit. The third unit comprises third heat exchange means 5. The function of the third heat exchange means 5 is the same as that of the first heat exchange means 3. The third heat exchange device 5 is provided with a steam inlet. The steam inlet of the third heat exchange device 5 is communicated with the third end of the second steam jet pump 42. The function of the second steam injection pump 42 is the same as that of the first steam injection pump 32, the high-temperature condensed water discharged from the second heat exchange device 4 enters the second flash evaporation device 41 for flash evaporation, and the steam flashed by the second flash evaporation device 41 and the steam in the main steam pipeline 1 are mixed with each other under the action of the second steam injection pump 42 and are conveyed to the third heat exchange device 5.
Wherein the third unit of the present embodiment comprises a third flash apparatus 51 and a third vapor jet pump 52. A high-temperature condensed water outlet is processed on the third heat exchange device 5. A high-temperature condensed water inlet and a steam outlet are processed on the third flash evaporation device 51, and the high-temperature condensed water inlet of the third flash evaporation device 51 is communicated with the high-temperature condensed water outlet of the third heat exchange device 5. The third vapor jet pump 52 has a first end 521, a second end 522 and a third end 523. The first vapor jet pump 32, the second vapor jet pump 42, and the third vapor jet pump 52 are identical in construction and are conventional in the art. The first end 521 of the third vapor jet pump 52 is in communication with the vapor outlet of the third flash apparatus 51. The second end 522 of the third steam jet pump 52 communicates with the main steam line 1. The waste heat step recovery device of the present embodiment includes a steam collection box 8. The third end 523 of the third steam jet pump 52 communicates with the steam collection tank 8. The first vapor jet pump 32, the second vapor jet pump 42, and the third vapor jet pump 52 are identical in structure and function and are conventional in the art. The high-temperature condensed water discharged by the third heat exchange device 5 enters the third flash evaporation device 51 for flash evaporation, and the steam flashed by the third flash evaporation device 51 and the steam in the main steam pipeline 1 are mixed with each other under the action of the third steam injection pump 32 and are conveyed to the steam collection box 8 for collection so as to be subsequently utilized.
In order to improve the utilization rate of heat, a high-temperature condensed water outlet is processed on the first flash evaporation device 31 and the second flash evaporation device 41. The high-temperature condensed water outlet of the first flash equipment 31 and the high-temperature condensed water outlet of the second flash equipment 41 are respectively communicated with the high-temperature condensed water inlet of the third flash equipment 51. The high-temperature condensed water which is not flashed in the first flash device 31 and the second flash device 41 enters the third flash device 51 for flash evaporation again, so that the heat in the high-temperature condensed water can be fully recycled.
A low-temperature condensed water outlet is processed on the third flash evaporation device 51, and the waste heat step recovery device of the embodiment comprises a water storage tank 7. The water storage tank 7 is communicated with the low-temperature condensed water outlet of the third flash evaporation device 51. The low-temperature condensed water remained after the flash evaporation through the third flash evaporation device 51 enters the water storage tank 7 to be collected. A circulating water path is formed between the water storage tank 7 and the steam temperature and pressure reducing device 2, and a water pump 71 is arranged on the circulating water path. The water pump 71 pumps the low-temperature water in the water storage tank 7 to spray into the steam temperature and pressure reducing device 2 so as to reduce the temperature of the steam in the steam temperature and pressure reducing device 2. The used water is stored in the water storage tank 7 again by the water pump 71.
The waste heat step recovery device of this embodiment includes the PLC controller. The PLC controller is connected to the first steam injection pump 32, the second steam injection pump 32, and the third steam injection pump 52 by cables, respectively, so as to control the start and stop operations of the first steam injection pump 32, the second steam injection pump 32, and the third steam injection pump 52.
Wherein, the high-temperature condensed water outlet of the first heat exchange device 3 is communicated with the high-temperature condensed water inlet of the first flash evaporation device 31, the high-temperature condensed water outlet of the second heat exchange device 4 is communicated with the high-temperature condensed water inlet of the second flash evaporation device 41, and the high-temperature condensed water outlet of the third heat exchange device 5 is communicated with the high-temperature condensed water inlet of the third flash evaporation device 51 through the connecting pipeline 6. The connecting pipe 6 is provided with a drainage system 61. The drain system includes an automatic on-off valve body 611 and a manual on-off valve body 612. The automatic opening/closing valve body 611 and the manual opening/closing valve body 612 are installed in parallel on the connection pipe 6. The automatic switch valve body 611 and the manual switch valve body 612 are both stop valves, and the functions of energy conservation and emission reduction are achieved through the drainage system 61.
In this embodiment, the steam temperature value and the steam pressure value in the first heat exchange device 3, the second heat exchange device 4 and the third heat exchange device 5 are different, and the steam temperature value and the steam pressure value are sequentially reduced, so that the steam quality of the high level, the medium level and the low level is formed. Specifically, in this embodiment, the steam temperature in the first heat exchange device 3 may be 220℃, the steam pressure may be 2.3Mpa, the steam temperature in the second heat exchange device 4 may be 210℃, the steam pressure may be 1.9Mpa, and the steam temperature in the third heat exchange device 5 may be 190℃, and the steam pressure may be 1.3 Mpa.
In the embodiment, each stage of steam jet pump adopts two or four multi-channel nozzles, the regulation ratio is high, and the highest injection ratio can reach 1: 1.
during specific use, high temperature high pressure superheated steam in the main steam pipeline 1 divides into two the tunnel, continue to maintain initial condition in main steam pipeline 1 all the way, another way supplies first heat transfer equipment 3 to use after reducing temperature and pressure to certain state according to the production process needs, exhaust high temperature comdenstion water gets into first flash evaporation equipment 31 and carries out the flash distillation, exhaust steam mixes through the high temperature high pressure superheated steam of initial condition in first steam jet pump 32 induction and the main steam pipeline 1 after the flash distillation, this hybrid process and mixing ratio are controlled according to the hot state of the required steam of second heat transfer equipment 4. When the temperature and pressure of the mixed steam reach the required state in the next production process, the mixed steam is input into the second heat exchange device 4 through the first steam jet pump 32. The heat recovery process of the subsequent steam of each stage is the same. Through the working principle, the steam consumption of each stage of heat exchange equipment can be reduced by about 10-35% in the embodiment.
The steam trunk line 1 of this embodiment communicates with steam injection pumps at different levels, uses through the cooperation of steam injection pumps at different levels, and the steam after the flash distillation from flash distillation equipment at different levels can effectively mix with the steam of steam trunk line to can improve the temperature and the pressure of mixing back steam, effectively satisfy the required steam state of follow-up production process. The steam heat after the flash evaporation is effectively recycled, and the waste of heat is avoided. According to the actual generation needs, can be with the temperature and the pressure adjustment of the steam after the mixture for producing required state to can provide the steam of multistage different temperature and pressure numerical value, effectively satisfy enterprise's production and processing demand.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. An induced injection type waste heat step recovery device based on predictive control comprises a steam main pipeline, a steam temperature and pressure reducing device, a first unit and a second unit; the method is characterized in that:
the steam temperature and pressure reducing device is provided with a steam inlet and a steam outlet; the steam inlet of the steam temperature and pressure reducing device is communicated with the main steam pipeline;
the first unit comprises first heat exchange equipment, first flash equipment and a first steam jet pump; the first heat exchange equipment is provided with a steam inlet and a high-temperature condensed water outlet; the steam inlet of the first heat exchange device is communicated with the steam outlet of the steam temperature and pressure reducing device; the first flash evaporation equipment is provided with a high-temperature condensed water inlet and a steam outlet; a high-temperature condensed water inlet of the first flash equipment is communicated with a high-temperature condensed water outlet of the first heat exchange equipment; the first steam jet pump is provided with a first end, a second end and a third end; the first end of the first steam jet pump is communicated with a steam outlet of the first flash device; the second end of the first steam jet pump is communicated with the main steam pipeline;
the second unit comprises second heat exchange equipment; the second heat exchange equipment is provided with a steam inlet; and the steam inlet of the second heat exchange device is communicated with the third end of the first steam jet pump.
2. The induction injection type waste heat gradient recovery device based on the predictive control is characterized in that: the second unit comprises a second flash apparatus and a second vapor jet pump; a high-temperature condensed water outlet is formed in the second heat exchange device; the second flash evaporation equipment is provided with a high-temperature condensed water inlet and a steam outlet; the high-temperature condensed water inlet of the second flash evaporation equipment is communicated with the high-temperature condensed water outlet of the second heat exchange equipment; the second steam jet pump is provided with a first end, a second end and a third end; the first end of the second steam jet pump is communicated with a steam outlet of the second flash evaporation equipment; the second end of the second steam jet pump is communicated with the steam main pipeline;
the waste heat step recovery device comprises a third unit; the third unit comprises third heat exchange equipment; the third heat exchange device is provided with a steam inlet; and the steam inlet of the third heat exchange device is communicated with the third end of the second steam jet pump.
3. The induction injection type waste heat gradient recovery device based on the predictive control is characterized in that: the third unit comprises a third flash apparatus and a third vapor jet pump; a high-temperature condensed water outlet is formed in the third heat exchange device; the third flash evaporation equipment is provided with a high-temperature condensed water inlet and a steam outlet; a high-temperature condensed water inlet of the third flash evaporation equipment is communicated with a high-temperature condensed water outlet of the third heat exchange equipment; the third steam jet pump is provided with a first end, a second end and a third end; the first end of the third steam jet pump is communicated with a steam outlet of the third flash evaporation equipment; the second end of the third steam jet pump is communicated with the main steam pipeline; the waste heat step recovery device comprises a steam collecting box; and the third end of the third steam jet pump is communicated with the steam collecting box.
4. The induction injection type waste heat gradient recovery device based on the predictive control is characterized in that: the first flash evaporation equipment and the second flash evaporation equipment are provided with high-temperature condensed water outlets; and the high-temperature condensed water outlet of the first flash evaporation equipment and the high-temperature condensed water outlet of the second flash evaporation equipment are respectively communicated with the high-temperature condensed water inlet of the third flash evaporation equipment.
5. The induction injection type waste heat gradient recovery device based on the predictive control is characterized in that: the waste heat step recovery device comprises a PLC controller; the PLC is respectively connected with the first steam jet pump, the second steam jet pump and the third steam jet pump.
6. The induction injection type waste heat gradient recovery device based on the predictive control is characterized in that: a low-temperature condensed water outlet is formed in the third flash evaporation equipment; the waste heat step recovery device comprises a water storage tank; and the water storage tank is communicated with a low-temperature condensed water outlet of the third flash evaporation equipment.
7. The induction injection type waste heat gradient recovery device based on the predictive control is characterized in that: the high-temperature condensed water outlet of the first heat exchange device is communicated with the high-temperature condensed water inlet of the first flash evaporation device, the high-temperature condensed water outlet of the second heat exchange device is communicated with the high-temperature condensed water inlet of the second flash evaporation device, and the high-temperature condensed water outlet of the third heat exchange device is communicated with the high-temperature condensed water inlet of the third flash evaporation device through connecting pipelines; a drainage system is arranged on the connecting pipeline; the drainage system comprises an automatic switch valve body and a manual switch valve body; the automatic switch valve body and the manual switch valve body are arranged on the connecting pipeline in parallel.
8. The induction injection type waste heat gradient recovery device based on the predictive control is characterized in that: and the steam temperature value and the steam pressure value in the first heat exchange device, the second heat exchange device and the third heat exchange device are different, and the steam temperature value and the steam pressure value are reduced in sequence.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113146817A (en) * | 2021-03-04 | 2021-07-23 | 贵州迪森元能源科技有限公司 | Automatic control system for residual gas utilization |
| CN114251642A (en) * | 2021-11-30 | 2022-03-29 | 碳中和绿色建筑科技(苏州)有限公司 | Fused salt heat storage and exchange system |
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| CN113146817A (en) * | 2021-03-04 | 2021-07-23 | 贵州迪森元能源科技有限公司 | Automatic control system for residual gas utilization |
| CN114251642A (en) * | 2021-11-30 | 2022-03-29 | 碳中和绿色建筑科技(苏州)有限公司 | Fused salt heat storage and exchange system |
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