CN-121994034-A - High-temperature molten waste residue waste heat utilization system

CN121994034ACN 121994034 ACN121994034 ACN 121994034ACN-121994034-A

Abstract

The invention relates to a high-temperature molten waste residue waste heat utilization system which comprises a fluidized bed, a boiler, an air flow generating device and a heat exchange device, wherein the fluidized bed is provided with a feed inlet, an air inlet and an air outlet for feeding waste residues, the heat storage part is respectively connected with the air inlet and the air outlet, the boiler is respectively connected with the air inlet and the air outlet, and the air flow generating device can be used for driving heat exchange gas to circularly flow between the fluidized bed and the heat storage part and driving the heat exchange gas to circularly flow between the fluidized bed and the boiler. The high-temperature gas can flow to the heat storage part for heat exchange to store heat in the electricity consumption low-peak period, and can flow to the boiler to enable the boiler to work for power generation and the like in the electricity consumption high-peak period, or flow to the heat storage part for heat storage and flow to the boiler for power generation in the other part, so that the waste heat of the high-temperature molten waste residue can be flexibly utilized in both the peak electricity period and the valley electricity period.

Inventors

LI QI
LI LEI
LI HAIDONG
LIU JUNQING
Miao Fafei
WANG HONGGANG

Assignees

国能榆林能源有限责任公司
北京低碳清洁能源研究院

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. A high temperature molten slag waste heat utilization system, comprising: the fluidized bed is provided with a feed inlet for feeding the waste residues, an air inlet arranged near the bottom position and an air outlet arranged near the top position; the heat storage part is respectively connected with the air inlet and the air outlet; A boiler connected to the air inlet and the air outlet, respectively, and And the airflow generating device can be used for driving heat exchange gas to circulate between the fluidized bed and the heat storage part and driving heat exchange gas to circulate between the fluidized bed and the boiler.
2. The high temperature molten slag waste heat utilization system of claim 1, wherein said airflow generating means is further operable to drive a heat exchanging gas to circulate between said heat storage portion and said boiler.
3. The high-temperature molten slag waste heat utilization system of claim 2, wherein a circulation path is formed between any two of the fluidized bed, the heat storage portion and the boiler through a pipe to allow a heat exchange gas to circulate between the respective two.
4. A high temperature molten slag waste heat utilization system as claimed in any one of claims 1 to 3 wherein said heat reservoir is made of carbon based solid heat storage material.
5. The system according to claim 4, wherein the heat storage unit includes a plurality of heat storage devices connected in series.
6. The high temperature molten slag waste heat utilization system of claim 5, wherein said gas flow generator is operable to drive a respective circulation of heat exchange gas between said fluidized bed and each of said heat storage means, and wherein said gas flow generator is operable to drive a respective circulation of heat exchange gas between said boiler and each of said heat storage means.
7. The high temperature molten slag waste heat utilization system of claim 6, further comprising: the first pipeline is connected between the air outlet of the fluidized bed and the boiler; the second pipeline is connected between the air inlet of the fluidized bed and the boiler; A plurality of third pipelines respectively connected between the corresponding heat storage device and the side wall of the first pipeline; A plurality of fourth pipelines, one ends of which are respectively connected with the corresponding heat storage devices; A fifth pipeline, wherein one ends of the fourth pipelines far away from the heat storage device are respectively connected with the side wall of the second pipeline through the fifth pipeline, and A sixth pipeline with one end connected to the side wall of the second pipeline and the other end connected to the fourth pipelines via the fifth pipeline, respectively, and At least one seventh pipeline connected between two adjacent heat storage devices, Wherein the airflow generating device is arranged at a position of the second pipeline between the fifth pipeline and the sixth pipeline.
8. The high-temperature molten slag waste heat utilization system according to claim 7, wherein a first valve is provided at a position of the first pipeline on a side of the plurality of third pipelines close to the fluidized bed, a second valve is provided at a position of the first pipeline on a side of the plurality of third pipelines close to the boiler, third valves are provided at the plurality of third pipelines, fourth valves are provided at the plurality of fourth pipelines, a fifth valve is provided at a position of the fifth pipeline on a side of the sixth pipeline close to the second pipeline, a sixth valve is provided at a position of the sixth pipeline on a side of the sixth pipeline remote from the gas flow generating device, a seventh valve is provided at a position of the second pipeline on a side of the fifth pipeline remote from the gas flow generating device, and a ninth valve is provided at the seventh pipeline.
9. The high temperature molten slag waste heat utilization system of any of claims 1-3, further comprising a particle separator disposed at an air outlet of the fluidized bed, wherein a return chute is disposed between a bottom end of the particle separator and the fluidized bed.
10. The high-temperature molten slag waste heat utilization system of any of claims 1-3, wherein the heat exchanging gas is an inert gas.

Description

High-temperature molten waste residue waste heat utilization system Technical Field The disclosure relates to the technical field of high Wen Feizha waste heat utilization, in particular to a high-temperature molten waste residue waste heat utilization system. Background In the production process of iron and steel, nonferrous metal smelting and the like, a large amount of waste slag with higher temperature, such as molten waste slag with the temperature of 1400-1500 ℃ such as blast furnace slag, converter slag and the like, can be generated. In the actual production process, the blast furnace slag and other waste residues are generally treated by a water quenching method, and a large amount of water is used for cooling the high-temperature molten slag, namely, the high-temperature molten slag is directly splashed into a slag pit and is crushed after being cooled by water spraying. However, the water quenching method requires a large amount of water resources to be wasted and causes waste heat of Wen Feizha, and part of water permeates into the ground through the soil, resulting in serious pollution of the groundwater. Disclosure of Invention It is an object of the present disclosure to provide a high temperature molten slag 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 high temperature molten slag waste heat utilization system, comprising: the fluidized bed is provided with a feed inlet for feeding the waste residues, an air inlet arranged near the bottom position and an air outlet arranged near the top position; the heat storage part is respectively connected with the air inlet and the air outlet; A boiler connected to the air inlet and the air outlet, respectively, and And the airflow generating device can be used for driving heat exchange gas to circulate between the fluidized bed and the heat storage part and driving heat exchange gas to circulate between the fluidized bed and the boiler. Optionally, the airflow generating device may be further used to drive heat exchange gas to circulate between the heat storage portion and the boiler. Optionally, a circulation path is formed between any two of the fluidized bed, the heat storage portion and the boiler through a pipeline to allow the heat exchange gas to circulate between the respective two. Optionally, the heat storage portion is made of carbon-based solid heat storage material. Optionally, the heat storage part comprises a plurality of heat storage devices connected in series with each other. Alternatively, the gas flow generating means may be adapted to drive a respective circulation of heat exchange gas between the fluidised bed and each of the heat storage means, and the gas flow generating means may be adapted to drive a respective circulation of heat exchange gas between the boiler and each of the heat storage means. Optionally, the method further comprises: the first pipeline is connected between the air outlet of the fluidized bed and the boiler; the second pipeline is connected between the air inlet of the fluidized bed and the boiler; A plurality of third pipelines respectively connected between the corresponding heat storage device and the side wall of the first pipeline; A plurality of fourth pipelines, one ends of which are respectively connected with the corresponding heat storage devices; A fifth pipeline, wherein one ends of the fourth pipelines far away from the heat storage device are respectively connected with the side wall of the second pipeline through the fifth pipeline, and A sixth pipeline with one end connected to the side wall of the second pipeline and the other end connected to the fourth pipelines via the fifth pipeline, respectively, and At least one seventh pipeline connected between two adjacent heat storage devices, Wherein the airflow generating device is arranged at a position of the second pipeline between the fifth pipeline and the sixth pipeline. Optionally, a first valve is disposed at a position of the first pipeline, which is located at a side of the third pipelines, which is close to the fluidized bed, a second valve is disposed at a position of the first pipeline, which is located at a side of the third pipelines, which is close to the boiler, a third valve is disposed at each of the third pipelines, a fourth valve is disposed at each of the fourth pipelines, a fifth valve is disposed at a position of the fifth pipeline, which is located at a side of the sixth pipeline, which is close to the second pipeline, a sixth valve is disposed at each of the sixth pipelines, a seventh valve is disposed at a side of the second pipeline, which is far from the gas flow generating device, a eighth valve is disposed at a position of the second pipeline, which is located at a side of the fifth pipeline, which is far from the gas flow generating device, and a ninth valve are disposed at each of the seventh pip