CN214626377U

CN214626377U - Cogeneration system capable of meeting balance of power supply and demand and heating power supply and demand

Info

Publication number: CN214626377U
Application number: CN202120945372.7U
Authority: CN
Inventors: 朱建新
Original assignee: Shenyang Shijie Electric Co ltd
Current assignee: Shenyang Shijie Electric Co ltd
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2021-11-05
Anticipated expiration: 2031-05-06

Abstract

The utility model relates to a can satisfy balanced combined heat and power generation system of electric power supply and demand and heating power supply and demand, it includes: a power generation system, characterized by: the power output end of the transformer for the power plant is connected with the power input end of the solid electric heat storage device, and the heat energy output end of the solid electric heat storage device is connected with a heat user; the heat energy output end of the steam turbine intermediate pressure cylinder is connected with the heat input end of the solid heat storage device, the heat energy output end of the solid heat storage device is connected with a heat user, and a heat supply network heat exchange station is further connected in parallel to a heat energy output pipeline between the steam turbine intermediate pressure cylinder and the solid heat storage device. When the system operates, redundant electric power is sent to the solid electric heat storage device to be converted into heat energy and then stored; the surplus steam is sent to a solid heat storage device to store the carried heat energy. Two different types of energy storage devices release stored thermal energy to the heat grid during peak thermal load periods. The traditional thermoelectric unit has better power depth peak regulation capability while meeting the heat supply requirement.

Description

Cogeneration system capable of meeting balance of power supply and demand and heating power supply and demand

Technical Field

The utility model belongs to the technical field of the thermoelectric decoupling zero, especially, relate to an electric heat energy storage combines together with steam energy storage and is applied to thermoelectric generating set's ability and satisfies balanced combined heat and power system of electric power supply and demand and heating power supply and demand.

Background

For the thermoelectric power generation units in the thermal power plant, there is a fixed coupling relationship between the electric power and the thermal power. In most cases, this coupling relationship cannot satisfy both the power supply and demand balance and the thermal supply and demand balance. Therefore, appropriate technical measures are needed to be taken, so that the thermoelectric unit can meet the requirements of power supply and demand balance and thermal power supply and demand balance.

Disclosure of Invention

The utility model aims at providing an electric heat energy storage combines together with steam energy storage and is applied to thermoelectric generating set's ability and satisfies balanced combined heat and power system of electric power supply and demand and heating power supply and demand.

The utility model discloses the technical scheme who adopts as follows: a cogeneration system capable of balancing the supply and demand of electricity and heat, comprising: power plant boiler, steam turbine high pressure jar, steam turbine intermediate pressure jar, steam turbine low pressure jar, the generator, the transformer for the power plant, the exit table, the electric wire netting, the heat consumer, solid electric heat storage device, solid heat storage device, heat supply network heat transfer station constitute its characterized in that: the power output end of the transformer for the power plant is connected with the power input end of the solid electric heat storage device, and the heat energy output end of the solid electric heat storage device is connected with a heat user; the heat energy output end of the steam turbine intermediate pressure cylinder is connected with the heat input end of the solid heat storage device, the heat energy output end of the solid heat storage device is connected with a heat user, and a heat supply network heat exchange station is further connected in parallel to a heat energy output pipeline between the steam turbine intermediate pressure cylinder and the solid heat storage device.

The utility model converts high-voltage electric energy into heat energy to be stored in the material of the solid electric heat storage device, the energy storage temperature reaches 300-800 ℃, and the stored heat energy is output in the form of hot water, saturated steam, superheated steam or hot air.

The utility model stores the heat energy carried by the high-temperature high-pressure steam in the solid heat storage device material, the energy storage temperature reaches 200-500 ℃, and the stored heat energy is output in the form of hot water, saturated steam, superheated steam or hot air.

Solid electric heat accumulation device and solid heat accumulation device output structure as an organic whole or for the components of a whole that can function independently structure that connects.

To the problem that above-mentioned prior art exists, the utility model provides a can realize electric power balance and can realize balanced combined heat and power mode of heating power again. In the mode, the solid heat storage device and the solid electric heat storage device are respectively arranged at the steam output port and the power output port of the thermal power plant, and form a combined operation system with the thermoelectric unit. In the new system, when the generated power is larger than the on-line electric power index, the redundant electric energy is stored by the solid electric heat storage device; when the steam heat energy output by the thermoelectric unit is larger than the heat load of a user, the heat energy carried by the redundant steam is stored by the solid heat storage device. The solid heat storage device and the solid electric heat storage device both have higher heat storage temperature, can keep heat energy stored in a high-grade state, and release the heat energy stored by the two energy storage devices in a hot water, saturated steam, superheated steam or hot air mode when the heat load of a user is in a peak period.

Compared with the prior thermoelectric decoupling technology, the utility model has the following advantages and effects: the utility model provides a brand-new cogeneration mode and heat-retaining method of the heat energy that residual steam carried make the thermoelectric unit can satisfy the balanced and balanced requirement of electric power supply and demand simultaneously. The solid thermal heat storage device of the technology utilizes the heat storage temperature range of the solid heat storage material of 600-50 ℃ to absorb all heat energy carried from a high-temperature steam state to a condensed water state, and has the advantages of outputting hot water below 150 ℃, saturated steam below 280 ℃ and superheated steam below 450 ℃ compared with the existing heat storage water tank which is arranged in a thermal power plant and can only output hot water below 95 ℃; compared with the existing phase-change heat storage device which can only utilize part of heat energy above the phase-change temperature for heating, the solid heat storage device of the technology has higher heat energy storage efficiency. The combined heat and power generation system mode has the characteristics of simple structure, reasonable design and flexible and reliable operation, and the traditional thermoelectric generating set has better power depth peak regulation capability while meeting the heat supply requirement.

Drawings

Fig. 1 is a schematic diagram of a cogeneration system according to the present invention.

In the figure: 1, a power station boiler; 2, a high-pressure cylinder of the steam turbine; 3, a steam turbine intermediate pressure cylinder; 4, a low-pressure cylinder of the steam turbine; 5, a generator; 6, a transformer for a power plant; 7, a gate table; 8, a power grid; 9, warming the user; 10 a solid electric thermal storage device; 11 a solid thermal heat storage device; 12 heat exchange station.

The following detailed description of the embodiments of the present patent refers to the accompanying drawings and is presented for purposes of illustration and description only and is not intended to limit the scope of the patent in any way. The drawing is only a schematic illustration of an embodiment of the present patent, and other drawings can be obtained by those skilled in the art without inventive effort.

Detailed Description

As shown in fig. 1, the utility boiler in the figure is 1; the high-pressure cylinder of the steam turbine is 2; the intermediate pressure cylinder of the steam turbine is 3; the low pressure cylinder of the steam turbine is 4; the number of the generators is 5; the number of the transformers for the power plant is 6; the gateway table is 7; the power grid is 8; the power output end of the transformer 6 for the power plant is connected with the power input end of the solid electric heat storage device 10, and the heat energy output end of the solid electric heat storage device 10 is connected with the heat consumer 9; the heat energy output end of the steam turbine intermediate pressure cylinder 3 is connected with the heat input end of the solid heat storage device 11, the heat energy output end of the solid heat storage device 11 is connected with the heat user 9, and a heat network heat exchange station 12 is further connected in parallel to a heat energy output pipeline between the steam turbine intermediate pressure cylinder 3 and the solid heat storage device.

When the normal cogeneration mode is in operation, the high-temperature steam generated by the power station boiler 1 passes through the steam turbine high-pressure cylinder 2 and the steam turbine intermediate-pressure cylinder 3, the steam turbine low-pressure cylinder 4 drives the generator 5 to generate electricity, and the high-temperature steam is boosted through the station transformer 6 and then is connected to the power grid 8 through the gateway table 7, and meanwhile, the steam is extracted from the steam turbine intermediate-pressure cylinder 3 and is conveyed to the heat consumer 9 through the heat supply network heat exchange station 12 to supply heat. When the heat supply extraction amount of the steam turbine intermediate pressure cylinder 3 is larger than the heat supply requirement, redundant steam is sent into the solid heat storage device 11 before the heat supply network heat exchange station 12, and the carried heat energy is stored; when the output power of the generator 5 is larger than the scheduled specified power of the power grid 8, the redundant electric power is sent to the solid electric heat storage device 10 before the gateway table 7, and the redundant electric power is converted into heat energy to be stored. When the heat load of the user is in a peak period, the stored heat energy is sent to the heat supply network by the heat exchangers of the solid electric heat storage device 10 and the solid heat storage device 11.

The solid electric heat storage device 10 of the present invention converts high voltage electric energy into heat energy to be stored in the material of the solid electric heat storage device, and the stored energy temperature reaches 300 ℃ -800 ℃, and outputs the stored heat energy in the form of hot water, saturated steam, superheated steam or hot air.

The solid heat storage device 11 of the present invention stores the heat energy carried by the high-temperature high-pressure steam in the solid heat storage device material, the energy storage temperature reaches 200-500 ℃, and the stored heat energy is outputted in the form of hot water, saturated steam, superheated steam or hot air.

The utility model discloses according to the scale and the area of power plant, select solid electric heat accumulation device and solid heat accumulation device output structure as an organic whole or for the components of a whole that can function independently structure that connects. When the output end is of an integrated structure, the solid thermal storage device is used for firstly supplying water to heat the first section of the water, and the solid electric thermal storage device is used for heating the last section of the water, so that the utilization rate of stored heat energy can be improved.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail, it should be understood by those skilled in the art that the embodiments of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the embodiments of the present invention, which should be covered by the scope of the claims of the present invention.

Claims

1. A cogeneration system capable of balancing the supply and demand of electricity and heat, comprising: power plant boiler, steam turbine high pressure jar, steam turbine intermediate pressure jar, steam turbine low pressure jar, the generator, the transformer for the power plant, the exit table, the electric wire netting, the heat consumer, solid electric heat storage device, solid heat storage device, heat supply network heat transfer station constitute its characterized in that: the power output end of the transformer for the power plant is connected with the power input end of the solid electric heat storage device, and the heat energy output end of the solid electric heat storage device is connected with a heat user; the heat energy output end of the steam turbine intermediate pressure cylinder is connected with the heat input end of the solid heat storage device, the heat energy output end of the solid heat storage device is connected with a heat user, and a heat supply network heat exchange station is further connected in parallel to a heat energy output pipeline between the steam turbine intermediate pressure cylinder and the solid heat storage device.

2. A cogeneration system according to claim 1, wherein: the high-voltage electric energy is converted into heat energy to be stored in the material of the solid electric heat storage device, the stored energy temperature reaches 300-800 ℃, and the stored heat energy is output in the form of hot water, saturated steam, superheated steam or hot air.

3. A cogeneration system according to claim 1, wherein: the heat energy carried by the high-temperature high-pressure steam is stored in the solid heat storage device material, the energy storage temperature reaches 200-500 ℃, and the stored heat energy is output in the form of hot water, saturated steam, superheated steam or hot air.

4. A cogeneration system according to claim 1, wherein: the solid electric heat storage device and the output end of the solid heat storage device are of an integral structure or of a split structure connected in parallel.