Solid particle heat storage and release system of multistage fluidized bed

A solid particle, fluidized bed technology, applied in heat storage equipment, heat exchanger types, indirect heat exchangers, etc., can solve problems such as large fluctuations in power generation load and difficulty in ensuring heat supply quality, and achieve release transfer efficiency. High, improve the effect of operating flexibility

Pending Publication Date: 2021-09-24
DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, in order to absorb more renewable energy power generation, thermal power generating units are required to be used as peak-shaving units, and the power generation load fluctuates greatly. The thermal power unit using the traditional steam extraction and heating mode is the premise of ensuring that the generating power of the unit meets the grid dispatching It is difficult to guarantee the quality of heat supply (steam flow, temperature, pressure, etc.)

Method used

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  • Solid particle heat storage and release system of multistage fluidized bed
  • Solid particle heat storage and release system of multistage fluidized bed
  • Solid particle heat storage and release system of multistage fluidized bed

Examples

Experimental program
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Effect test

Embodiment 1

[0036] In this embodiment, a multi-stage fluidized bed solid particle heat storage and release system is specifically provided, which can be used not only for in-service generating units, but also for newly built generating units.

[0037] The system mainly includes: heat storage and heat exchange subsystem, heat release heat exchange subsystem, particle transportation subsystem, connecting pipes between subsystems and related valve accessories on each pipe, etc. The main principle is to use solid particle storage Heat, the thermal energy of high-temperature steam is converted into sensible heat of solid particles for storage. The storage temperature is high, which can meet the demand for industrial steam supply with higher parameters. At the same time, the release and transfer of stored heat are realized through heat exchange, and the energy storage and transfer efficiency is high. Among them, in actual application, solid particles can be selected locally, such as sand and gra...

Embodiment 2

[0065] In the multi-stage fluidized bed solid particle heat storage and release system provided in Example 1, its heat storage and heat exchange subsystem uses steam extraction from the unit to heat low-temperature solid particles into high-temperature solid particles, while in this embodiment, it uses After the high-temperature main steam / generating unit generates electricity, the solid particles are heated by electric heaters, and electric heating tubes are arranged in each of the heat storage heat exchangers, and the low-temperature solid particles are heated to high-temperature solid particles under the action of the electric heating tubes , in order to realize the storage of heat and realize the deep peak regulation function of the unit.

Embodiment 3

[0067] In the multi-stage fluidized bed solid particle heat storage and release system provided in Example 1, it provides fluidized air through the fluidized fan configured in the system, and circulates the fluidized air to reduce the heat loss of the fluidized air. In this embodiment, the fluidizing air used is changed to the hot secondary air from the boiler, and the solid particles are fluidized and directly go to the furnace (no need to return and recycle), thereby reducing the selection requirements of the fluidizing fan. For details, see Figure 6 , Figure 7 shown.

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Abstract

The invention discloses a solid particle heat storage and release system of a multistage fluidized bed and belongs to the technical field of heat storage. The solid particle heat storage and release system comprises a heat storage and exchange unit, a heat release and exchange unit and a particle transportation unit, the heat storage and exchange unit is provided with a steam channel and a heat storage particle channel, and when the steam of a unit is sufficient, solid particles circulating in the heat storage particle channel are heated through unit steam extraction in the steam channel; the heat release and exchange unit is provided with a water supply channel and a heat release particle channel, and when the unit is in a low load, solid particles circulating in the heat release particle channel are used for heating water in the water supply channel so as to form superheated steam; the particle transportation unit is connected between the heat storage and exchange unit and the heat release and exchange unit and provides power for circulation of solid particles in the heat storage particle channel and the heat release particle channel, so that the external steam supply capacity of the unit can be kept stable, and the heat supply capacity is not affected by the power generation load of the unit, therefore, the operation flexibility of a cogeneration unit is improved.

Description

technical field [0001] The invention belongs to the technical field of heat storage, and in particular relates to a multistage fluidized bed solid particle heat storage and release system. Background technique [0002] Under the situation that my country's energy-saving and emission-reduction is being further promoted, small thermal power units and heating boiler rooms with high energy consumption have been shut down in various places, and centralized heating is implemented by cogeneration. Once the thermal power unit implements heat supply, it needs to ensure the quality of heat supply. While ensuring the quality of heat supply, large thermal power units also face the contradiction between heat supply and power grid peak shaving. In particular, in order to absorb more renewable energy power generation, thermal power generating units are required to be used as peaking units, and the power generation load fluctuates greatly. The thermal power unit using the traditional steam ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D20/00
CPCF28D20/0056Y02E60/14
Inventor 李有霞李维成周旭黄敏朱洋肖欣悦韦耿周棋莫春鸿
Owner DONGFANG BOILER GROUP OF DONGFANG ELECTRIC CORP
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