CN-121993274-A - Combined ORC waste heat power generation system for heat recovery of cooler and adjusting method

CN121993274ACN 121993274 ACN121993274 ACN 121993274ACN-121993274-A

Abstract

The invention discloses a composite ORC waste heat power generation system for recovering heat of a cooler and an adjusting method thereof, belonging to the technical field of waste heat power generation, wherein the composite ORC waste heat power generation system comprises a supercritical carbon dioxide Brayton cycle unit, an organic Rankine cycle unit and an air preheating unit; the supercritical carbon dioxide Brayton cycle unit is respectively connected with the organic Rankine cycle unit and the air preheating unit, and comprises a first compressor, a first cooler, a third cooler and a power generation module, wherein the first compressor, the first cooler, the third cooler and the power generation module are connected in series. On the basis of introducing an organic Rankine cycle into the supercritical carbon dioxide Brayton cycle to construct the combined cycle, the heat of the high temperature section in the cooler is absorbed together by utilizing the air and the organic Rankine cycle working medium, so that the heat dissipation of the cooler to the environment is further reduced, the heat in the cooler is effectively utilized, and the efficient absorption of the waste heat of the flue gas of the hearth is realized.

Inventors

HAN JIANQIANG
ZHAO LIQIAN
YIN QIAN
ZHU MING
ZHAO CHUANHAI
CHENG WEN
ZHANG PING
CHEN YIWEN
YANG XUGUANG
DING CUI
ZHU RUIHUA

Assignees

中国石油天然气集团有限公司
中国石油国际勘探开发有限公司
中油国际管道有限公司

Dates

Publication Date: 20260508
Application Date: 20241105

Claims (10)

1. The composite ORC waste heat power generation system for heat recovery of the cooler is characterized by comprising a supercritical carbon dioxide Brayton cycle unit, an organic Rankine cycle unit and an air preheating unit; The supercritical carbon dioxide Brayton cycle unit is respectively connected with the organic Rankine cycle unit and the air preheating unit; the supercritical carbon dioxide Brayton cycle unit comprises a first compressor (1), a first cooler (11), a third cooler (20) and a power generation module; The first compressor (1), the first cooler (11), the third cooler (20) and the power generation module are connected in series.
2. The composite ORC waste heat power generation system of claim 1 wherein the supercritical carbon dioxide brayton cycle unit further comprises a low temperature regenerator (4), a medium temperature regenerator (5) and a high temperature regenerator (6); The low-temperature heat regenerator (4), the medium-temperature heat regenerator (5) and the high-temperature heat regenerator (6) are connected in series; The outlet of the first compressor (1) is connected with the first inlet of the low-temperature heat regenerator (4); the second outlet of the low-temperature heat regenerator (4) is connected with the first inlet of the third cooler (20).
3. The combined ORC waste heat power generation system of claim 2, wherein the power generation module comprises a first heater (7), a second heater (8), a first turbine (9) and a second turbine (10); The first heater (7) is connected with a first outlet of the high-temperature heat regenerator (6); the first heater (7), the first turbine (9), the second heater (8) and the second turbine (10) are connected in series; The second turbine (10) is connected with a second inlet of the high-temperature heat regenerator (6); The first heater (7) and the second heater (8) are arranged inside the hearth.
4. The combined ORC waste heat power generation system of claim 2, wherein the supercritical carbon dioxide brayton cycle unit further comprises a second compressor (2) and a third compressor (3); The inlet of the second compressor (2) is connected with the second outlet of the low-temperature heat regenerator (4), and the outlet is connected with the first outlet of the low-temperature heat regenerator (4); the inlet of the third compressor (3) is connected with the second outlet of the medium-temperature heat regenerator (5), and the outlet is connected with the first outlet of the medium-temperature heat regenerator (5).
5. A chiller heat recovery hybrid ORC waste heat power generation system as set forth in claim 3 wherein said supercritical carbon dioxide brayton cycle unit further comprises a flue gas chiller (12); one end of the flue gas cooler (12) is connected with the first outlet of the medium-temperature heat regenerator (5), and the other end of the flue gas cooler is connected with the inlet of the first heater (7).
6. The combined ORC waste heat power generation system of claim 1, wherein the air preheating unit comprises a first air preheater (18) and a second air preheater (19); the air outlet of the first cooler (11) is connected with the air inlet of the third cooler (20); the air outlet of the third cooler (20) is connected with the air inlet of the second air preheater (19); the first air outlet of the second air preheater (19) is connected with the hearth, and the second air outlet is connected with the air inlet of the first air preheater (18); The air outlet of the first air preheater (18) is connected with the hearth.
7. The combined ORC waste heat power generation system of claim 2, wherein the ORC unit comprises a second cooler (13), a circulation pump (14), a condenser (15), a third turbine (16) and a flue gas heater (17); the second cooler (13), the circulating pump (14), the condenser (15), the third turbine (16) and the flue gas heater (17) are connected in series; the first inlet of the second cooler (13) is connected with the second outlet of the low-temperature heat regenerator (4), and the first outlet is connected with the inlet of the first cooler (11); The flue gas heater (17) is arranged below the flue gas outlet of the hearth.
8. A method of tuning a composite ORC cogeneration system based on chiller heat recovery of any one of claims 1-7, comprising: Data acquisition, namely monitoring and acquiring parameters in the composite ORC waste heat power generation system for heat recovery of the cooler in real time; Blurring processing, namely converting the acquired control parameters into blurring variables; rule making, namely making a fuzzy logic rule according to operation experience; Fuzzy reasoning, namely calculating a fuzzy set of output variables by using a fuzzy reasoning method according to a formulated fuzzy logic rule; Deblurring, namely converting a fuzzy set of output variables into control parameters; Output control, namely generating corresponding control signals according to control parameters obtained after defuzzification treatment, and adjusting the rotating speed of the circulating pump (14) or the temperature set value of the heat exchanger; And (3) system adjustment, namely adjusting fuzzy logic rules and parameters according to control effects and system feedback.
9. The adjustment method according to claim 8, characterized in that the data acquisition comprises the steps of: collecting first parameters in the composite ORC waste heat power generation system for heat recovery of the cooler through a sensor, and collecting second parameters of the composite ORC waste heat power generation system for heat recovery of the cooler through a multi-mode sensor; The first parameter and the second parameter are transmitted to the central data processing unit in real time; The central data processing unit integrates the first parameter and the second parameter; and analyzing the integrated parameters in real time, and dividing the integrated parameters into abnormal parameters and control parameters.
10. The adjustment method according to claim 9, characterized in that the processing step of the anomaly parameter is as follows: Comparing the current abnormal parameters with the historical abnormal parameters, wherein each historical abnormal parameter corresponds to a processing flow; when the abnormal parameters are identified to be the same as the historical abnormal parameters, executing a processing flow corresponding to the historical abnormal parameters, and simultaneously feeding back relevant information to a first group of personnel; when the abnormal parameter is identified to be different from the historical abnormal parameter, the relevant information is fed back to the second group of personnel.

Description

Combined ORC waste heat power generation system for heat recovery of cooler and adjusting method Technical Field The invention belongs to the technical field of waste heat power generation, and particularly relates to a composite ORC waste heat power generation system for heat recovery of a cooler and an adjusting method. Background With the continuous growth of energy demand and the increasing awareness of environmental protection, improving energy utilization efficiency and developing renewable energy have become urgent demands for the society of today. In energy conversion devices such as coal-fired power generation systems and gas turbines in large-scale gas stations, the waste heat recovery technology has been attracting attention because of its capability of significantly improving energy utilization efficiency. Conventional waste heat recovery systems often suffer from inefficiency and poor adaptability. On one hand, the traditional system is difficult to keep high-efficiency operation under different working conditions due to the large temperature and pressure fluctuation range of the waste heat source, and on the other hand, the control strategy of the traditional system is generally based on fixed parameter setting, lacks self-adaptive adjustment capability, and cannot respond to the change of the system state in real time. Compared with the traditional steam Rankine cycle, the S-CO 2 cycle has the advantages that 1) the critical parameter is low, the supercritical state is easy to reach, 2) CO 2 is an inert fluid, the reaction rate with metal is smaller than that of steam, and 3) the S-CO 2 cycle system is compact, so that the S-CO 2 Brayton cycle has wide engineering application prospect in the field of power generation. However, when the S-CO 2 is applied to the field of coal-fired power generation, the temperature of CO 2 entering a turbine is far higher than that of a water unit, so that low-temperature flue gas waste heat is difficult to be effectively absorbed, and although the introduction of flue gas adjustment (Flue Gas Conditioning, FGC) ensures that the flue gas waste heat is effectively absorbed, the circulating heat efficiency is reduced due to the additional heat absorption. And conventional waste heat recovery systems often suffer from inefficiency and poor adaptability. Aiming at the defects of the prior art, the waste heat resource is effectively utilized, the efficient absorption of the waste heat of the flue gas is realized, and the improvement of the energy utilization efficiency is urgent. Disclosure of Invention In order to solve the problems, the invention discloses a composite ORC waste heat power generation system for heat recovery of a cooler, which comprises a supercritical carbon dioxide Brayton cycle unit, an organic Rankine cycle unit and an air preheating unit; The supercritical carbon dioxide Brayton cycle unit is respectively connected with the organic Rankine cycle unit and the air preheating unit; The supercritical carbon dioxide Brayton cycle unit comprises a first compressor, a first cooler, a third cooler and a power generation module; the first compressor, the first cooler, the third cooler, and the power generation module are connected in series. Still further, the supercritical carbon dioxide Brayton cycle unit further comprises a low temperature regenerator, a medium temperature regenerator and a high temperature regenerator; the low-temperature heat regenerator, the medium-temperature heat regenerator and the high-temperature heat regenerator are connected in series; the first compressor outlet is connected with the first inlet of the low-temperature heat regenerator; And the second outlet of the low-temperature heat regenerator is connected with the first inlet of the third cooler. Still further, the power generation module includes a first heater, a second heater, a first turbine, and a second turbine; the first heater is connected with a first outlet of the high-temperature heat regenerator; the first heater, the first turbine, the second heater and the second turbine are connected in series; the second turbine is connected with a second inlet of the high-temperature heat regenerator; The first heater and the second heater are both arranged inside the hearth. Still further, the supercritical carbon dioxide Brayton cycle unit further includes a second compressor and a third compressor; the inlet of the second compressor is connected with the second outlet of the low-temperature heat regenerator, and the outlet of the second compressor is connected with the first outlet of the low-temperature heat regenerator; and the inlet of the third compressor is connected with the second outlet of the medium-temperature heat regenerator, and the outlet of the third compressor is connected with the first outlet of the medium-temperature heat regenerator. Still further, the supercritical carbon dioxide Brayton cycle unit further comprises a flue gas cooler; One end o