CN-116538490-B - Steam production system

CN116538490BCN 116538490 BCN116538490 BCN 116538490BCN-116538490-B

Abstract

The application discloses a steam production system, which solves the problems of large design and construction difficulty and weak adjustment capability of a long-distance steam pipeline. The steam production system comprises a steam generation unit and a compressor unit, wherein the steam generation unit comprises N-level flash evaporators, the compressor unit comprises N-level compressors, N is more than or equal to 2, the N-level flash evaporators are connected in series, flash water sequentially passes through the N-level flash evaporators, the M-level compressors are connected with the M-level flash evaporators, M is more than or equal to 1 and less than or equal to N, steam generated by the M-level flash evaporators is input into the M-level compressors, and the M-level compressors compress the steam and then output the compressed steam. According to the application, the hot water pipe network is utilized to carry out hot water delivery, so that a long-distance steam delivery pipeline is replaced, the design and construction difficulties are reduced, and the system stability and the production efficiency are improved.

Inventors

LI ZIYONG
FU LIN
ZHAO XILING
ZHANG SHIGANG

Assignees

清华大学
北京清建能源技术有限公司

Dates

Publication Date: 20260508
Application Date: 20230606

Claims (13)

1. The steam production system is characterized by comprising a steam generation unit and a compressor unit, wherein the steam generation unit comprises N stages of flash evaporators, the compressor unit comprises N stages of compressors, N is more than or equal to 2, N stages of flash evaporators are connected in series, and flash water sequentially passes through the N stages of flash evaporators; wherein the M-th stage compressor is connected with the M-th stage flash evaporator, M is more than or equal to 1 and less than or equal to N, the steam generated by the M-stage flash evaporator is input into an M-stage compressor, and the M-stage compressor compresses the steam and outputs the compressed steam; the flash evaporator comprises a flash water inlet, a flash water outlet, a steam outlet and a steam inlet, wherein the flash water inlet of the M-th stage flash evaporator except the first stage flash evaporator is connected with the flash water outlet of the M-1-th stage flash evaporator, the flash water inlet of the first stage flash evaporator is connected with a flash water conveying pipeline, and the flash water outlet of the last stage flash evaporator is connected with a flash water backflow pipeline; The compressor comprises a steam inlet and a steam outlet, the steam inlet of the M-th stage compressor is connected with the steam outlet of the M-th stage flash evaporator, the steam outlet of the M-th stage compressor except the first stage compressor is connected with the steam inlet of the M-1-th stage flash evaporator, and the steam outlet of the first stage compressor is connected with a steam pipeline of a user.
2. The steam production system according to claim 1, further comprising a heat source heating device, a heat source delivery pipe, and a heat source return pipe, wherein the heat source heating device comprises a high-temperature water outlet and a low-temperature water inlet, the high-temperature water outlet is connected to the heat source delivery pipe, the low-temperature water inlet is connected to the heat source return pipe, the heat source delivery pipe delivers high-temperature water to the steam generation unit, and the cooled low-temperature water returns to the heat source heating device from the heat source return pipe; Or the steam generator also comprises a heat source heating device and a heat source conveying pipeline, wherein the heat source heating device comprises a high-temperature water outlet, the high-temperature water outlet is connected with the heat source conveying pipeline, the heat source conveying pipeline conveys high-temperature water to the steam generator unit, and the cooled low-temperature water is discharged outwards.
3. The steam production system of claim 2, further comprising a first circulation line, a circulation water heater comprising a hot water inlet connected to the heat source delivery line, a hot water outlet connected to the heat source return line or discharging outwardly, a circulation water inlet connected to the flash water outlet of the steam generating unit through the first circulation line, and a circulation water outlet connected to the flash water inlet of the steam generating unit through the first circulation line.
4. The steam production system of claim 2, further comprising a water replenishment pipe, a condensate recovery pipe, wherein an outlet of the water replenishment pipe and an outlet of the condensate recovery pipe are connected to a flash water inlet or a flash water outlet of the steam generation unit, and wherein both the water replenishment and the condensate are converted into flash water in the flash evaporator.
5. The steam production system of claim 4, further comprising a preheater, wherein a heat exchanger is arranged in the preheater, the heat exchanger is respectively connected with the branch pipeline of the heat source conveying pipeline and the water supplementing pipeline, the preheater absorbs heat energy in the heat source conveying pipeline and heats water flowing in the water supplementing pipeline; or the heat exchanger is respectively connected with an external heat source pipeline and the water supplementing pipeline, and the preheater absorbs heat energy in the external heat source pipeline and heats water flowing in the water supplementing pipeline.
6. A steam production system according to claim 3, further comprising a second circulation pipe, a heat pump unit, wherein the heat pump unit comprises a K-stage heat pump, the K-stage heat pump is connected in series and/or in parallel when K is greater than or equal to 1 and K is greater than or equal to 2, an evaporator is arranged in the heat pump, the evaporator is respectively connected with the hot water outlet of the heat source conveying pipe or the circulating water heater and the second circulation pipe, the inlet of the second circulation pipe is connected with the circulating water outlet of the final-stage flash evaporator, the outlet of the second circulation pipe is connected with the circulating water inlet of any one-stage flash evaporator, and the heat pump absorbs heat energy in the heat source conveying pipe and heats water circulating in the second circulation pipe.
7. A steam production system according to claim 3, further comprising a third circulation pipe and a heat pump unit, wherein the heat pump unit comprises a K-stage heat pump, the K-stage heat pump is connected in parallel when K is greater than or equal to 1 and K is greater than or equal to 2, an evaporator is arranged in the heat pump and is respectively connected with the heat source conveying pipe or a hot water outlet of the circulating water heater and the third circulation pipe, the third circulation pipe circulates between the M-stage heat pump and the M-stage flash evaporator, a condenser is arranged in the flash evaporator, the third circulation pipe is respectively connected with the evaporator of the M-stage heat pump and the condenser of the M-stage flash evaporator, the heat pump absorbs heat energy in the heat source conveying pipe, heats the refrigerant circulated in the third circulation pipe, and then heats flash water in the flash evaporator.
8. The steam production system of claim 6 or 7, wherein the heat pump is an electrically driven heat pump or a thermally driven absorption heat pump.
9. The steam production system of claim 2, wherein a sea water desalination device is arranged in the heat source heating device, fresh water produced by the sea water desalination device is output from the high-temperature water outlet, and the produced concentrated solution is discharged outwards.
10. The steam production system according to claim 2, wherein a heat exchanger is provided inside the steam generation unit, the heat exchanger is respectively connected to the heat source conveying pipeline and the heat source return pipeline, and the steam generation unit absorbs heat energy in the heat source conveying pipeline, heats flash water in the steam generation unit, and produces steam.
11. The steam production system of claim 2, further comprising a condensate recovery conduit, wherein the heat source transfer conduit is coupled to the condensate recovery conduit in combination with the flash water inlet of the steam generation unit and into the steam generation unit to produce steam, and wherein the heat source return conduit is coupled to the flash water outlet of the steam generation unit.
12. The vapor production system of claim 1, wherein the compressor is a single stage compressor or a multi-stage compressor; The multistage compressor comprises H-stage sub-compressors, H is more than or equal to 2, the H-stage sub-compressors are connected in series, steam sequentially passes through the H-stage sub-compressors, each sub-compressor comprises a steam outlet and a steam inlet, and a cooling device is arranged at the steam outlet.
13. The steam production system of claim 2, further comprising a low temperature tank, a high temperature tank, a secondary heat exchanger, and a secondary flash evaporator, the low temperature tank comprising a first inlet and a second inlet, the first inlet being connected to the heat source transfer conduit, the second inlet being connected to the heat source return conduit; the high-temperature tank comprises a first inlet, a first outlet, a second inlet and a second outlet, wherein the first inlet is connected with the auxiliary heat exchanger, the second inlet is connected with the second outlet is connected with the auxiliary flash evaporator, and the auxiliary heat exchanger and the auxiliary flash evaporator are respectively connected with the compressor unit.

Description

Steam production system Technical Field The application relates to the technical field of industrial steam supply, in particular to a steam production system. Background The energy consumption of the industrial users is more than 65% of the energy consumption of the terminals in China. Steam is used in processes such as distillation and drying in many industrial applications, such as chemical industry, food industry, textile industry, and the like, and has a large energy consumption. Currently, industrial users still produce steam mainly from boilers, especially coal-fired boilers. This approach directly consumes fossil energy, resulting in significant carbon and pollution emissions. In addition, the mode is used for producing high-temperature steam, then the high-temperature steam is conveyed to a user, throttling and depressurization are used, and irreversible loss is very large. As coal-fired boilers are increasingly banned, other ways to meet the steam needs of industrial users are sought. Extraction of steam from a power plant and then delivery to industrial users via steam lines is an alternative operational solution to industrial park boilers. However, the design difficulty of the long-distance steam pipeline is high, and reasonable heat preservation design, pipe diameter selection and mechanical analysis are required to be carried out so as to ensure safe and stable operation. In addition, the steam conveying system has weak regulation capability, the quality loss is large when the load of a user fluctuates, a large amount of steam is required to be lost by the heat pipe when the steam pipeline is started, and the safety problems of condensation, water attack and the like of the steam pipeline are easy to occur when the steam pipeline is partially loaded. Disclosure of Invention In order to solve the problems in the prior art, the application aims to provide a steam production system which is used for preparing industrial steam, can replace a long-distance steam conveying pipeline and can also replace an industrial coal-fired steam boiler. In order to achieve the technical purpose, the application adopts the following technical scheme: the application provides a steam production system, which comprises a steam generation unit and a compressor unit, wherein the steam generation unit comprises N-level flash evaporators, the compressor unit comprises N-level compressors, N is more than or equal to 2, the N-level flash evaporators are connected in series, and flash water sequentially passes through the N-level flash evaporators; the M-stage compressor is connected with the M-stage flash evaporator, M is more than or equal to 1 and less than or equal to N, steam generated by the M-stage flash evaporator is input into the M-stage compressor, and the M-stage compressor compresses the steam and then outputs the compressed steam. Optionally, the flash evaporator comprises a flash water inlet, a flash water outlet and a steam outlet, wherein the flash water inlet of the M-th stage flash evaporator except the first stage flash evaporator is connected with the flash water outlet of the M-1 th stage flash evaporator, the flash water inlet of the first stage flash evaporator is connected with a flash water conveying pipeline, and the flash water outlet of the last stage flash evaporator is connected with a flash water reflux pipeline; The compressor comprises a steam inlet and a steam outlet, the steam inlet of the M-stage compressor is connected with the steam outlet of the M-stage flash evaporator, and the steam outlet of the M-stage compressor is connected with a steam pipeline of a user; Or the steam inlet of the M-th stage compressor is connected with the steam outlet of the M-th stage flash evaporator, meanwhile, the steam outlet of the M-th stage compressor except the first stage compressor is connected with the steam inlet of the M-1 th stage compressor, and the steam outlet of the first stage compressor is connected with a steam pipeline of a user. Optionally, the flash evaporator comprises a flash water inlet, a flash water outlet, a steam outlet and a steam inlet, wherein the flash water inlet of the M-stage flash evaporator except the first-stage flash evaporator is connected with the flash water outlet of the M-1-stage flash evaporator, the flash water inlet of the first-stage flash evaporator is connected with a flash water conveying pipeline, and the flash water outlet of the last-stage flash evaporator is connected with a flash water reflux pipeline; The compressor comprises a steam inlet and a steam outlet, the steam inlet of the M-th stage compressor is connected with the steam outlet of the M-th stage flash evaporator, the steam outlet of the M-th stage compressor except the first stage compressor is connected with the steam inlet of the M-1-th stage flash evaporator, and the steam outlet of the first stage compressor is connected with a steam pipeline of a user. Optionally, the device further