CN-121994052-A - Flue gas waste heat utilization system

CN121994052ACN 121994052 ACN121994052 ACN 121994052ACN-121994052-A

Abstract

The disclosure relates to a flue gas waste heat utilization system, which comprises a plurality of heat storage devices and a boiler, wherein the plurality of heat storage devices are sequentially communicated from upstream to downstream, the boiler is communicated with the downstream of one of the plurality of heat storage devices, which is located at the most downstream, a plurality of flue gases are respectively communicated with the corresponding one of the heat storage devices, and the temperature of the flue gas communicated by any one of the plurality of heat storage devices is higher than that of the flue gas communicated by the heat storage device located at the upstream. The electricity consumption peak period controls the various flue gases to flow into the corresponding heat storage devices respectively, flow towards the downstream to absorb heat from the heat storage devices and flow into the boiler. The complexity of the flue gas waste heat utilization system is effectively simplified, and the utilization equipment is not required to be arranged for flue gas with different temperatures. And the flow of gradual heat release and gradual heat absorption can fully utilize the flue gas waste heat of each temperature, and the waste heat utilization efficiency is improved.

Inventors

LI LEI
YANG CONGMING
LIU JUNQING
WEN LIANG
CHEN XUSHENG
WANG HONGGANG

Assignees

北京低碳清洁能源研究院
国能榆林能源有限责任公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. A flue gas waste heat utilization system, the flue gas includes multiple that the temperature is different, its characterized in that, flue gas waste heat utilization system includes: a plurality of heat storage devices which are communicated in sequence from upstream to downstream, and A boiler communicated downstream of one of the plurality of heat storage devices located most downstream, Wherein, a plurality of flue gas is respectively communicated with a corresponding one of the heat storage devices, and the temperature of the flue gas communicated with any one of the plurality of heat storage devices is higher than the temperature of the flue gas communicated with the heat storage device positioned at the upstream thereof.
2. The flue gas waste heat utilization system of claim 1, wherein each of the flue gases is further in communication with one of the heat storage device or the boiler downstream of its respective heat storage device, respectively.
3. The flue gas waste heat utilization system of claim 2, wherein a plurality of said heat storage devices and said boiler are adjacent to two communicating with the same said flue gas.
4. A flue gas waste heat utilization system according to any one of claims 1 to 3, further comprising a plurality of electric heating devices for heating the heat storage devices corresponding thereto, respectively.
5. The flue gas waste heat utilization system according to any one of claims 1 to 3, wherein the plurality of heat storage devices includes a first heat storage device, a second heat storage device, and a third heat storage device that are sequentially communicated from upstream to downstream, the plurality of flue gases includes a first flue gas, a second flue gas, and a third flue gas that are sequentially increased in temperature, The first flue gas is communicated with the first heat storage device and the second heat storage device, the second flue gas is communicated with the second heat storage device and the third heat storage device, and the third flue gas is communicated with the third heat storage device and the boiler.
6. The flue gas waste heat utilization system of claim 1, further comprising a fan in communication downstream of the boiler.
7. The flue gas waste heat utilization system of claim 6, wherein the fan is further in communication with an upstream-most one of the plurality of heat storage devices.
8. The flue gas waste heat utilization system according to claim 1, further comprising a chimney, wherein the boiler and one of the plurality of heat storage devices located furthest upstream are respectively communicated with the chimney.
9. The flue gas waste heat utilization system of claim 8, further comprising a purification device disposed at an air inlet of the chimney.
10. The flue gas waste heat utilization system according to claim 1, wherein the heat storage device is made of a carbon-based material.

Description

Flue gas waste heat utilization system Technical Field The disclosure relates to the technical field of flue gas waste heat utilization, in particular to a flue gas waste heat utilization system. Background A large amount of waste heat is generated in industrial production. At present, the utilization level of industrial waste heat in the domestic industry is low, and particularly the utilization level of low-quality waste heat is still to be improved. The typical waste heat utilization mode is to utilize a waste heat boiler to generate waste heat power, but the waste heat generated in the industrial production process has uneven quality (different temperature), so that the existing waste heat utilization system has various equipment, namely, the utilization equipment needs to be arranged for different quality flue gas respectively, and the utilization efficiency of low quality waste heat with lower temperature is lower. Disclosure of Invention It is an object of the present disclosure to provide a flue gas waste heat utilization system to at least partially solve the problems in the related art. In order to achieve the above object, the present disclosure provides a flue gas waste heat utilization system, the flue gas includes a plurality of kinds of temperature differences, the flue gas waste heat utilization system includes: a plurality of heat storage devices which are communicated in sequence from upstream to downstream, and A boiler communicated downstream of one of the plurality of heat storage devices located most downstream, Wherein, a plurality of flue gas is respectively communicated with a corresponding one of the heat storage devices, and the temperature of the flue gas communicated with any one of the plurality of heat storage devices is higher than the temperature of the flue gas communicated with the heat storage device positioned at the upstream thereof. Optionally, each of the flue gases is also in communication with one of the heat storage devices or the boilers downstream of its respective heat storage device, respectively. Optionally, a plurality of said heat storage devices and said boiler are adjacent to both communicating with the same said flue gas. Optionally, a plurality of electric heating devices are further included for heating the heat storage devices corresponding to the electric heating devices respectively. Optionally, the plurality of heat storage devices comprise a first heat storage device, a second heat storage device and a third heat storage device which are communicated from upstream to downstream in sequence, the plurality of flue gases comprise first flue gas, second flue gas and third flue gas with sequentially increased temperature, The first flue gas is communicated with the first heat storage device and the second heat storage device, the second flue gas is communicated with the second heat storage device and the third heat storage device, and the third flue gas is communicated with the third heat storage device and the boiler. Optionally, a fan is further included in communication with the downstream of the boiler. Optionally, the fan is further in communication with an upstream-most one of the plurality of heat storage devices. Optionally, the system further comprises a chimney, and one of the plurality of heat storage devices located at the most upstream and the boiler are respectively communicated with the chimney. Optionally, the device further comprises a purification device arranged at the air inlet of the chimney. Optionally, the heat storage device is made of a carbon-based material. According to the technical scheme, in the electricity consumption valley period, various kinds of flue gas are controlled to flow into corresponding heat storage devices respectively and release heat, then flow continuously in the upstream direction, release heat respectively when passing through each heat storage device until flowing to the most upstream heat storage device and then being discharged, gradual heat release heat storage is achieved, the heat storage temperatures of the plurality of heat storage devices are sequentially increased in the upstream-to-downstream direction, in the electricity consumption peak period, various kinds of flue gas are controlled to flow into corresponding heat storage devices respectively, flow continuously in the downstream direction, and absorb heat sequentially from the heat storage devices with higher temperature until flowing into a boiler to release heat for the boiler to work and generate steam. By the design, multiple kinds of flue gas can be controlled to release heat and store heat step by step in depth in the electricity consumption low peak period, and multiple kinds of flue gas can be controlled to absorb heat step by step and act on the same boiler in the electricity consumption peak period, so that the complexity of a flue gas waste heat utilization system is effectively simplified, utilization equipment is not required