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CN-224228734-U - Heating coil and pressure relief system for starting expansion machine of high-capacity compressed gas energy storage power station

CN224228734UCN 224228734 UCN224228734 UCN 224228734UCN-224228734-U

Abstract

The utility model discloses a heating pipe starting and pressure releasing system for an expansion machine of a high-capacity compressed gas energy storage power station, and relates to the technical field of expansion machines of compressed gas energy storage power stations. The system comprises a gas storage, an n-level expander and an n-level heat exchanger, wherein an outlet of the heat exchanger is connected with a first inlet of the expander and a second inlet of the expander, the first outlet and the second outlet of the expander are connected with an inlet of a heat exchanger of a next level, a starting heating pipe/flushing control valve group is connected in parallel with a main shutoff valve, and the starting heating pipe/flushing control valve group comprises a bypass regulating valve and an inlet and outlet shutoff valve of the bypass regulating valve. According to the utility model, the heating pipe air quantity of the two air inlet pipelines of each stage of expansion machine is regulated through the first heating pipe/pressure relief regulating valve and the second heating pipe/pressure relief regulating valve which are respectively arranged, so that the heating rate balance of the heating pipes of the two side pipelines is ensured, the heating rates of the two air inlet pipelines with different lengths are the same, the heating pipe time and the heating pipe air consumption are reduced, and the starting rate and the electric conversion efficiency of a power station are improved.

Inventors

  • HAN LIANG
  • RUAN GANG
  • LI XIN
  • ZHANG KAI
  • HUANG JUNJUN
  • LIU FANGQI
  • LI QINGHE
  • WANG AO

Assignees

  • 中国电力工程顾问集团中南电力设计院有限公司

Dates

Publication Date
20260512
Application Date
20250515

Claims (7)

  1. 1. The utility model provides a large capacity compressed gas energy storage power station expander starts heating coil, pressure release system, includes gas storage (100), expansion machine (200) of n level and heat exchanger (300) of n level, gas storage (100) are connected with expansion machine (200) of one level through main shut-off valve (110), heat exchanger (300) of one level in proper order, expansion machine (200) of n level are connected in proper order, set up heat exchanger (300) between expansion machine (200) of adjacent two-level, its characterized in that: The outlet of the heat exchanger (300) is connected with the first inlet of the expander (200) through a first expansion inlet shutoff valve (210), and is connected with the second inlet of the expander (200) through a second expansion inlet shutoff valve (220), and the first outlet and the second outlet of the expander (200) are combined or are connected with the inlet of the heat exchanger (300) of the next stage independently; the system also comprises a starting heating pipe/flushing control valve group (400) and an n-level starting heating pipe/pressure relief system (500); The starting heating pipe/flushing control valve group (400) is connected with the main shutoff valve (110) in parallel, and the starting heating pipe/flushing control valve group (400) comprises a bypass regulating valve (410) and a bypass regulating valve inlet and outlet shutoff valve (420); The starting heating pipe/pressure relief system (500) comprises a first heating pipe/pressure relief shutoff valve (510), a second heating pipe/pressure relief shutoff valve (520), a first heating pipe/pressure relief regulating valve (530) and a second heating pipe/pressure relief regulating valve (540), wherein the heat exchanger (300) and the first expansion inlet shutoff valve (210) are sequentially connected with the inlet of the heat exchanger (300) of the next stage through the first heating pipe/pressure relief shutoff valve (510) and the first heating pipe/pressure relief regulating valve (530), and the heat exchanger (300) and the second expansion inlet shutoff valve (220) are sequentially connected with the inlet of the heat exchanger (300) of the next stage through the second heating pipe/pressure relief shutoff valve (520) and the second heating pipe/pressure relief regulating valve (540).
  2. 2. The high-capacity compressed gas energy-storage power station expander starting heating coil and pressure relief system according to claim 1, further comprising an emergency pressure relief system (600), wherein the emergency pressure relief system (600) is arranged at an inlet of the heat exchanger (300) from the second level to the n level, the emergency pressure relief system (600) comprises a quick pressure relief valve (610), and the quick pressure relief valve (610) is connected with an inlet pipeline of the heat exchanger (300).
  3. 3. The method for starting a heating pipe and pressure relief system of an expander of a high capacity compressed gas energy storage power station as claimed in claim 2, wherein said quick pressure relief valve (610) is connected to a muffler (620).
  4. 4. The system for starting a heating pipe and relieving pressure of an expansion machine of a high-capacity compressed gas energy storage power station according to claim 1, wherein an outlet of the heat exchanger (300) of one stage is connected with a first inlet of the expansion machine (200) of one stage sequentially through a first expansion inlet shutoff valve (210) and a first primary regulating valve (211), and is connected with a second inlet of the expansion machine (200) of one stage sequentially through a second expansion inlet shutoff valve (220) and a second primary regulating valve (221).
  5. 5. The system for starting a heating pipe and relieving pressure of an expansion machine of a high-capacity compressed gas energy storage power station according to claim 4, wherein the pipe diameter of the starting heating pipe/flushing control valve group (400) is selected according to the maximum flow of heating pipe and flushing of the expansion machine (200).
  6. 6. The system for starting a heating pipe and relieving pressure of an expander of a high capacity compressed gas energy storage power station as claimed in claim 5, wherein said expander (200) has three stages, said heat exchanger (300) has three stages, and said heating pipe/relieving pressure system (500) has three stages.
  7. 7. The expander start-up heater and pressure relief system for a high capacity compressed gas storage power plant of claim 6, wherein said first heater/pressure relief shut-off valve (510) inlet conduit is disposed proximate to said first expansion inlet shut-off valve (210) inlet conduit and said second heater/pressure relief shut-off valve (520) inlet conduit is disposed proximate to said second expansion inlet shut-off valve (220) inlet conduit; The outlet pipeline of the first heating pipe/pressure relief regulating valve (530) and the outlet pipeline of the second heating pipe/pressure relief regulating valve (540) are arranged close to the inlet pipeline of the heat exchanger (300) of the next stage.

Description

Heating coil and pressure relief system for starting expansion machine of high-capacity compressed gas energy storage power station Technical Field The utility model relates to the technical field of expanders of compressed gas energy storage power stations, in particular to a system for starting a heating pipe and relieving pressure of an expander of a high-capacity compressed gas energy storage power station. Background The compressed gas energy storage system is a high-capacity and ultra-long time energy storage technology which can be compared with pumped storage and is recognized at present, can provide auxiliary services such as peak regulation, frequency modulation, phase modulation, black start, rotational inertia and the like for a power grid, is considered as effective supplement of a pumped storage power station, and is widely paid attention to students at home and abroad at present. The domestic compressed gas energy storage research starts later, but engineering practice is in the front, and coverage is realized from a kilowatt-level test unit to a 300 MW-level demonstration unit. The large-capacity compressed gas energy storage power station for grid-connected power generation comprises a Jiangsu gold altar 60MW, hebei Zhangjiu North 100MW, hubei Yingcheng 300MW and Shandong Feichong 300MW demonstration projects and the like, and compared with a pumped storage power station, the demonstration projects have certain gaps in the aspects of electric conversion efficiency, power grid response speed, price policies and the like, and have a long path to travel for large-scale application, so that the power station conversion efficiency is further improved, the unit start-stop response speed is accelerated, and a reasonable price policy is formulated to be a necessary path for supporting large-scale development of the compressed gas energy storage power station. In order to improve the power station electric conversion efficiency, the main and auxiliary equipment efficiency improvement and the system optimization design in the normal operation stage are focused, and the influence of the unit start-stop stage on the power station conversion efficiency is not ignored, including accelerating the compressor unit start-up time, reducing the power consumption in the start-up stage, reducing the expansion unit start-up stage time, reducing the gas consumption in the start-up stage and the like, and for the expansion unit, the reduction of the gas consumption in the start-up stage can start from the optimized expansion machine start-up system. The heat storage system of the conventional expander adopts a step-by-step heating scheme, namely a pipeline between an outlet of a heat exchanger and an inlet of a first-stage expander is preheated after gas storage is heated by a first-stage heat exchanger, the pipeline is discharged to the atmosphere through a heating pipe branch pipe before an inlet shutoff valve of the first-stage expander, a first-stage expander inlet shutoff valve and an adjusting valve are opened after the preheating of the pipeline is completed before the inlet of the first-stage expander, air flow enters a second-stage heat exchanger, an inlet pipeline of the second-stage expander is preheated after the heating of the heat exchanger, and the pipeline is discharged to the atmosphere through a pipe branch pipe arranged at the inlet of the second-stage expander, and the pipeline is preheated through the same steps after the heating of the inlet pipeline of the second-stage expander. Along with the continuous increase of the capacity of the compressed gas energy storage power station, the rated air inflow of the expander is gradually increased, and the air inflow and the exhaust pipelines of each stage of the expander are mainly in double control, namely, each stage of expander is provided with two air inflow pipelines and two exhaust pipelines, which are affected by the arrangement of the power station, the lengths of the two air inflow pipelines are not completely identical, so that the heating pipe temperature rising rates of the two pipelines are also different, air inflow is allowed only after the temperatures of the two air inflow pipelines meet the air inflow requirement, the heating pipe time is prolonged undoubtedly, and the heating pipe air consumption is increased. In summary, the whole process of starting the heating pipe is complex under the conventional scheme, the heating pipe is long in time, the air consumption in the heating pipe stage is large, and especially, the heating pipe speed of the two side air inlet pipes is unbalanced, so that the heating pipe time and the heating pipe air consumption are further increased, high-pressure air in the air storage is wasted, and the starting speed and the electric-to-electric conversion efficiency of the power station are seriously affected. Meanwhile, in order to avoid overspeed of the expander caused by direct entering of high-pressure g