Novel water pumping compressed air energy storage system

Abstract

The utility model provides a novel water pumping compressed air energy storage system which is attached to a water pumping energy storage power station and provided with a gas storage, a water diversion lower adit is provided with a first fork, and the water diversion lower adit is connected with the gas storage at the first fork through a connecting hole so as to provide high water head water pressure for the gas storage and return water from the gas storage. An emergency gate shaft is arranged in the connecting hole and provided with an emergency gate used for connecting and disconnecting the connecting hole; the water pumping compressed air energy storage system is further provided with a maintenance traffic adit of the gas storage, and the maintenance traffic adit is formed by converting the construction adit of the gas storage. According to the utility model, a building with shorter construction period and lower cost can be adopted, the construction of the pumped storage power station and the construction of the pumped storage power station can be carried out in parallel without mutual interference, and the system is suitable for modular construction of each part, and is convenient to manage, high in utilization rate of the gas storage cavern, low in investment cost and low in construction difficulty.

Description

TECHNICAL FIELD

[0001] The utility model relates to a novel pumping compressed air energy storage system, especially applicable to the pumping compressed air energy storage system of high water head pumped storage power station. BACKGROUND

[0002] The compressed air energy storage technology is a kind of technology using compressed air to store energy.At present, the compressed air energy storage technology is the second GW-level large-scale power storage technology considered to be suitable after pumped storage.The working principle is that during the low electricity consumption period, air is compressed to high pressure by using electric energy and stored in cave or pressure container, so that electric energy is converted into internal energy of air and stored;During the high electricity consumption period, high-pressure air is released from the gas storage chamber, enters the combustion chamber, is heated after burning fuel, and drives the turbine to generate electricity.The general compressed air energy storage system generally includes the following six components: compressor, expander, combustion chamber and heat exchanger, gas storage device, motor / generator, control system and auxiliary equipment.

[0003] The underground gas storage is to store compressed air in underground cave or salt cave.This storage mode has high storage capacity and safety, but the geological characteristics and environmental impact of storage cave or salt cave need to be considered.In order to improve the output efficiency of compressed air energy storage, the underground chamber has a large area, and in order to ensure the safety and stability of the gas storage chamber, steel lining support is generally used.This arrangement form has high investment cost, long construction period and low utilization rate of gas storage chamber. UTILITY MODEL CONTENT

[0004] The utility model aims at the above-mentioned problems, and provides a novel pumping compressed air energy storage system, which can compress high-pressure gas in the gas storage chamber through the static water pressure between the upper reservoir and the gas storage chamber, do work by turbine, reduce the construction cost of energy storage system and improve the utilization rate of gas storage chamber.

[0005] A novel pumping compressed air energy storage system is attached to pumped storage power station, and the pumped storage power station is provided with a diversion undercrossing between the diversion shaft and the powerhouse of the pumped storage power station;The pumping compressed air energy storage system is provided with a gas storage chamber, the diversion undercrossing is provided with a first branch, and the diversion undercrossing is connected with the gas storage chamber through a connecting hole at the first branch to provide high water head pressure for the gas storage chamber and drain water from the gas storage chamber, and an emergency gate well is arranged in the connecting hole, and the emergency gate well is provided with an emergency gate for connecting and shutting off the connecting hole;The pumping compressed air energy storage system is also provided with a maintenance traffic branch hole of the gas storage chamber, and the maintenance traffic branch hole is formed by converting the construction branch hole of the gas storage chamber.

[0006] Considering the power generation efficiency maximization, the elevation of the gas storage is slightly lower than the lower tunnel of the water diversion tunnel of the pumped storage power station. In order to improve the excavation forming quality of the whole gas storage tunnel and speed up the construction progress, the gas storage chamber of the gas storage is formed by TBM excavation, which is preferably composed of an annular tunnel and has a circular section.

[0007] The top of the gas storage is provided with an air vent connected with the ground air compression system.

[0008] Since the tunnel is deeply buried, the surrounding rock is generally good, and the gas pressure of the gas storage tunnel is relatively low, after the excavation is completed, the steel reinforced concrete lining can be used for sealing (without steel lining) to increase the airtightness and stability of the whole structure of the gas storage tunnel. Moreover, the connecting hole can also use the steel reinforced concrete lining (without steel lining), and the section is circular.

[0009] The beneficial effects of the utility model are:

[0010] The pumped compressed air energy storage system can be built with shorter construction period and smaller cost, and can be constructed in parallel with the construction of the pumped storage power station without interference, and is suitable for modular construction of each part, and is convenient for management. The pumped compressed air energy storage system also has the following technical effects:

[0011] 1. The utility model stores energy by compressed gas through the static water pressure between the upper reservoir and the gas storage, and adjusts the opening degree of the gas valve during power generation, which is flexible and controllable, and is suitable for various pumped storage power stations and has a wide range of applications.

[0012] 2. The accident gate well is arranged to reduce the influence of the pumped compressed air energy storage on the operation of the pumped storage power station.

[0013] 3. Compared with the traditional compressed air energy storage system, the gas storage chamber of the utility model requires smaller gas storage area, has strong stability and higher safety, and all the compressed air can be utilized, so that the utilization rate is high, the investment cost is low, and the construction difficulty is small. DRAWINGS

[0014] Fig. 1 It is a plane layout of the gas storage system of the utility model.

[0015] Fig. 2 It is a typical longitudinal section layout of the gas storage system of the utility model.

[0016] Fig. 3 It is a typical longitudinal section of the accident gate hole of the utility model. DETAILED DESCRIPTION

[0017] For example, Figs. 1-3The utility model provides a novel pumped compressed air energy storage system, the pumped compressed air energy storage system is attached to pumped storage power station setting, pumped storage power station sets up water diversion under horizontal tunnel 100, water diversion under horizontal tunnel 100 is located between the water diversion well and plant of pumped storage power station, the water diversion well is connected to reservoir.New pumped compressed air energy storage mainly includes connecting hole 301, emergency gate well 400 and gas storage 300, maintenance traffic branch hole, the following detailed explanation.

[0018] Pumped compressed air energy storage system sets up gas storage 300, water diversion under horizontal tunnel 100 is provided with first branch 101, and water diversion under horizontal tunnel 100 is connected with gas storage 300 at first branch 101 through connecting hole 301 to provide high water head water pressure to gas storage 300 and from gas storage water withdrawal, and, for the individual operation management of pumped compressed air energy storage system, in combination with the characteristics of pumped storage power station, emergency gate well 400 is set up in the middle of connecting hole 301, and emergency gate well 400 sets up emergency gate 402 for connecting and shutting off connecting hole 301, and the top of emergency gate well 400 is emergency gate hole 401, and the pumped compressed air energy storage system still sets up the maintenance traffic branch hole of gas storage 300, and the maintenance traffic branch hole is converted to form by gas storage construction branch hole 302 after the construction of gas storage.

[0019] Gas storage 300 is annular gas storage chamber 301 formed by TBM excavation.

[0020] The water diversion under horizontal tunnel construction branch hole 200 of pumped storage power station sets up second branch 201, and the gas storage construction branch hole 302 extends from second branch 201 to gas storage 300.

[0021] The construction sequence of the pumped compressed air energy storage system of the utility model for gas storage 300 is as follows:

[0022] 1, after the excavation of under horizontal tunnel construction branch hole 200 is completed to the design position of second branch 201, the branch hole can be excavated along the construction direction of gas storage construction branch hole 302 as TBM excavation assembly and starting hole section.

[0023] 2. Parallel to the construction of the pumped storage power station, the construction adits 302 and the gas storage caverns 303 of the gas storage are continuously excavated by TBM, and a certain turning radius 304 is arranged at each intersection of the gas storage caverns 303, so as to facilitate TBM excavation. The intersection 304 between the gas storage cavern 303 and the connecting hole 301 is arranged in a horn mouth shape. In order to improve the excavation and forming quality of the intersection hole, the "hole first and wall later" construction measure is adopted. When the TBM excavating the gas storage cavern 303 reaches the designed position of the intersection 304, the intersection 304 is first expanded and excavated, and then the TBM construction of the gas storage cavern 303 is continued.

[0024] The construction sequence of the connecting hole 301 is as follows:

[0025] When the diversion underground tunnel of the pumped storage power station is excavated to the designed position of the first intersection 101, the connecting hole 301 is excavated in the excavation direction of the connecting hole 301. Considering the excavation and blasting interference between adjacent caverns and the requirement of excavating out the residue of the accident gate well, the connecting hole 301 is excavated to the designed position below the accident gate well, and then the excavation construction of the diversion undergroun tunnel 100 is continued. At this time, the excavation construction of the diversion undergroun tunnel 100 and the construction of the accident gate hole 401 and the accident gate well 400 are carried out in parallel. After the excavation of the diversion undergroun tunnel 100 is completed and the excavation of the accident gate well is completed, the excavation construction of the connecting hole section between the accident gate hole 401 and the gas storage 300 is carried out.

[0026] The construction sequence of the accident gate well 400 is as follows:

[0027] In the middle of the tail gate traffic hole and the tail gate transportation hole of the pumped storage power station, a branch hole, i.e. the third construction adit 500 and the fourth construction adit 600, is excavated respectively, which is used for the excavation of the accident gate hole 401 and the transportation of equipment. The corbels 402 arranged on the side walls of the accident gate hole are used for bridge foundation installation and gate hoisting. Based on the fact that the connecting hole 301 has been excavated, the accident gate well 400 is excavated downward from the accident gate hole 401. The reference number 403 is a ladder in the accident gate hole 401 connected to the bridge foundation.

[0028] After the excavation of the gas storage cavern 303 of the gas storage is completed, a hole 700 is vertically drilled from the ground surface according to the geological and topographical conditions. In order to ensure the connection of the gas, a seamless stainless steel pipe is buried in time after the hole is drilled.

[0029] The above description is not a limitation of the present application, and the present application is not limited to the above examples. Within the scope of the present application, changes, additions or replacements made by ordinary skilled in the art should be within the protection scope of the present application.

Claims

1. A novel pumped compressed air energy storage system, the pumped compressed air energy storage system being attached to a pumped storage power station, the pumped storage power station being provided with a water diversion undercrossing, the water diversion undercrossing being located between a water diversion shaft and a powerhouse of the pumped storage power station; characterized in that, The pumped compressed air energy storage system is provided with an air storage library, a first branch is arranged at the water diversion undercrossing, the water diversion undercrossing is connected with the air storage library through a connecting hole at the first branch to provide high water head pressure for the air storage library and to drain water from the air storage library, an accident gate well is arranged at the connecting hole, and the accident gate well is provided with an accident gate for switching on and switching off the connecting hole.

2. A novel pumped hydro compressed air energy storage system as claimed in claim 1 wherein, The pumped compressed air energy storage system is provided with an air storage library, a first branch is arranged at the water diversion undercrossing, the water diversion undercrossing is connected with the air storage library through a connecting hole at the first branch to provide high water head pressure for the air storage library and to drain water from the air storage library, an accident gate well is arranged at the connecting hole, and the accident gate well is provided with an accident gate for switching on and switching off the connecting hole.

3. A novel pumped hydro compressed air energy storage system as claimed in claim 1, wherein, The pumped compressed air energy storage system is provided with an air storage library, a first branch is arranged at the water diversion undercrossing, the water diversion undercrossing is connected with the air storage library through a connecting hole at the first branch to provide high water head pressure for the air storage library and to drain water from the air storage library, an accident gate well is arranged at the connecting hole, and the accident gate well is provided with an accident gate for switching on and switching off the connecting hole. The pumped compressed air energy storage system is provided with an air storage library, a first branch is arranged at the water diversion undercrossing, the water diversion undercrossing is connected with the air storage library through a connecting hole at the first branch to provide high water head pressure for the air storage library and to drain water from the air storage library, an accident gate well is arranged at the connecting hole, and the accident gate well is provided with an accident gate for switching on and switching off the connecting hole. The pumped compressed air energy storage system is provided with an air storage library, a first branch is arranged

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