CN210458236U

CN210458236U - Waste heat power generation system utilizing sensible heat recovery of blast furnace slag

Info

Publication number: CN210458236U
Application number: CN201821815100.XU
Authority: CN
Inventors: 侯宾才; 方明; 陈慧; 王阳; 孙政军
Original assignee: Nanjing Triumph Kaineng Environment & Energy Co ltd
Current assignee: Nanjing Triumph Kaineng Environment & Energy Co ltd
Priority date: 2018-11-05
Filing date: 2018-11-05
Publication date: 2020-05-05
Anticipated expiration: 2028-11-05

Abstract

The utility model provides an utilize waste heat power generation system of blast furnace slag sensible heat recovery, belong to the energy recovery utilization field among the steel industry, including the blast furnace, the blast furnace slag hold up tank, middle heat-retaining medium pours into the machine in succession, the slabbing machine, breaker, get the heat machine, separator, exhaust-heat boiler, power generation system, hot-air control processing system, the blast furnace links to each other with the blast furnace slag hold up tank, the blast furnace slag hold up tank links to each other with the slabbing machine, middle heat-retaining medium pours into the machine in succession and is located the slabbing machine top, the slabbing machine tip passes through breaker and links to each other with getting the heat machine, separator is connected with getting the heat machine bottom, it links to each other with exhaust-heat boiler to get the heat machine tip, exhaust-heat boiler's air outlet is connected with hot-air control processing system, exhaust-. The utility model discloses a with blast furnace slag and middle heat-retaining medium hybrid cooling to the hot-air that produces the mixture retrieves the electricity generation, the reasonable recycle energy.

Description

Waste heat power generation system utilizing sensible heat recovery of blast furnace slag

Technical Field

The utility model discloses an utilize waste heat power generation system of blast furnace slag sensible heat recovery belongs to the energy recovery utilization field of steel industry.

Background

The iron and steel industry provides important basic raw materials for the development of national economy, belongs to resource-intensive industries with large energy and resource consumption, and discharges a large amount of waste while producing iron and steel products, thereby causing serious pollution to the environment. The blast furnace slag is a byproduct of blast furnace ironmaking, the discharge temperature of the blast furnace slag is 1400-1600 ℃, and 1700MJ sensible heat contained in each ton of blast furnace slag is equivalent to a 58Kg standard coal heat value. By 2016, the pig iron production in our country is about 8 hundred million tons. The blast furnace slag yield is close to 3.15 hundred million tons according to the blast furnace slag iron ratio of domestic large and medium-sized iron and steel enterprises of about 450 kg/t. Therefore, the blast furnace slag sensible heat recovery is an important way for energy conservation and emission reduction of iron and steel enterprises.

At present, the blast furnace slag treatment in China generally adopts a water quenching method, namely, a large amount of water is used for cooling high-temperature molten slag. And only in Panxi areas, a hot slag splashing method is adopted, namely, high-temperature molten slag is directly splashed to a slag pit, and is crushed after being cooled by water spraying. The water quenching method and the hot slag splashing method respectively consume 1.0 ton (evaporation) and 0.3 ton of water per ton of slag, and because part of water permeates soil and permeates underground, the underground water is seriously polluted; meanwhile, 5-250 g of sulfide is discharged into the atmosphere per ton of slag in the cooling process, so that the atmospheric pollution is caused.

In summary, these treatments result in an economic loss of about 230 billion yuan per year and cause serious pollution to underground water resources and atmospheric environment, calculated as about 3.15 million tons of slag discharged by 8 million tons of pig iron in China.

Therefore, the sensible heat recovery power generation treatment of the blast furnace slag can treat the high-heat slag with low pollution and low consumption, and can use heat for power generation so as to finish the effective utilization of energy, thus becoming an effective way for treating the high-heat slag.

SUMMERY OF THE UTILITY MODEL

The utility model provides a waste heat power generation system and method for sensible heat recovery of blast furnace slag.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the system comprises a blast furnace, a blast furnace slag storage pool, an intermediate heat storage medium continuous injection machine, a block making machine, a crushing device, a heat extraction machine, a separation device, a waste heat boiler, a power generation system and a hot air control processing system; the blast furnace is connected with the blast furnace slag storage tank, the blast furnace slag storage tank is connected with the agglomeration machine, middle heat-retaining medium continuous injection machine is located the agglomeration machine top, the agglomeration machine tip pass through breaker and with get the heat machine and link to each other, separator is connected with the heat machine bottom of getting, it links to each other with exhaust-heat boiler to get the heat machine tip, exhaust-heat boiler's air outlet is connected with hot-air control processing system, exhaust-heat boiler's steam outlet is connected with power generation system.

Further, the intermediate heat storage medium adopted by the intermediate heat storage medium continuous injection machine is a steel ball with the diameter of 30 mm.

Further, a protective heat insulation cover is arranged outside the agglomeration machine.

Furthermore, the heat extractor is of a sectional structure and is divided into a high-temperature air section, a medium-temperature air section and a low-temperature air section, the high-temperature air section comprises a first high-temperature air inlet and a first high-temperature air outlet, the medium-temperature air section comprises a second medium-temperature air inlet and a second medium-temperature air outlet, the low-temperature air section comprises a third low-temperature air inlet and a third low-temperature air outlet, the first high-temperature air outlet and the second medium-temperature air outlet of the heat extractor are respectively connected with the waste heat boiler, the third low-temperature air outlet of the heat extractor is connected with the first high-temperature air inlet, and the second medium-temperature air inlet is connected to the hot air control processing system.

Further, the power generation system comprises a steam turbine and a generator, wherein the steam turbine is connected with the waste heat boiler through a steam pipeline, and the generator is connected with the steam turbine.

Furthermore, the hot air control processing system comprises a dust remover and a chimney, wherein an inlet of the dust remover is connected with an air outlet of the waste heat boiler, an outlet of the dust remover is connected with the chimney, and the dust remover is also connected with a second medium-temperature air inlet.

The utility model has the advantages as follows: the utility model discloses a "middle heat-retaining medium" mixes with blast furnace slag and has shortened the heat transfer of blast furnace slag and solidify, combines heat extractor and cogeneration, has realized the purpose with blast furnace slag sensible heat recovery and utilization, and the blast furnace slag that obtains can be used as the cement raw materials, and the steam that obtains can be used to the electricity generation. Compared with the existing water quenching method, the utility model effectively recovers the sensible heat of the blast furnace slag, saves water resources and reduces environmental pollution; compared with the air quenching method, the utility model discloses utilize heat transfer medium to realize the quick cooling of blast furnace slag, improved the economic nature of system.

Drawings

FIG. 1 is a flow chart of a waste heat power generation system using sensible heat recovery of blast furnace slag according to the present invention;

the labels in the figure are: 1-blast furnace; 2-blast furnace slag storage pool; 3-continuous injection of intermediate heat storage medium into the machine; 4-a block making machine; 5-a crushing device; 6-heat taking machine; 7-high temperature air outlet; 8-medium temperature wind outlet; 9-a low-temperature air outlet; 10-a first high-temperature air inlet; 11-a second medium temperature air inlet; 12-a third low temperature air inlet; 13-a separation device; 14-a waste heat boiler; 15-a steam line; 16-a steam turbine; 17-a generator; 18-dust remover, 19-chimney; 20-protective heat shield; 21-a hot air control treatment system; 22-power generation system.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples.

As shown in fig. 1, the utility model discloses a waste heat power generation system using sensible heat recovery of blast furnace slag, which uses an agglomeration machine 4 and a heat extractor 6 to recover and utilize the sensible heat of blast furnace slag. The blast furnace slag flows out of a blast furnace 1 and then enters a blast furnace slag storage pool 2, liquid slag is poured into a block making machine 4, an intermediate heat storage medium continuous injection machine 3 is arranged above the block making machine 4, heat storage medium is continuously and uniformly injected into the block making machine 4, the heat storage medium is a steel ball with the diameter of about 30mm, and the heat storage medium uniformly penetrates through the blast furnace slag at a fixed mass ratio and height; the heat storage medium and the blast furnace slag are mixed, crushed by the crushing device 5 and sent into the heat extractor 6, the mixture exchanges heat with air in the heat extractor 6 and then enters the separating device 13, the separated heat storage medium is separated and stored for recycling, and the blast furnace slag is used as a cement raw material after being intensively stored.

The heat extractor 6 is of a sectional structure, a first high-temperature air outlet 7 and a second medium-temperature air outlet 8 are respectively connected with two air inlets of the waste heat boiler 14, air subjected to heat exchange from the waste heat boiler 14 is sent to a dust remover 18, and the dust remover 18 is connected with a medium-temperature flue gas inlet 11 of the heat extractor 6 through a fan, so that residual air recirculation is realized; the dust remover 18 is also connected with a chimney 19, and the air quantity of the residual air recirculation can be adjusted. A third low-temperature flue gas outlet 9 of the heat engine 6 is connected with a first high-temperature flue gas inlet 10, so that the initial temperature of air is increased, the air inlet temperature of the waste heat boiler is increased, and the power generation capacity is increased; the normal temperature air enters the heat extractor through the low temperature air inlet 12 of the heat extractor.

The steam from the waste heat boiler 14 is led via the boiler outlet to a steam turbine 16, which steam turbine 16 drives a generator 17 to generate ■.

The above description is only one embodiment of the present invention, and does not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. The waste heat power generation system for recovering sensible heat of blast furnace slag is characterized by comprising a blast furnace (1), a blast furnace slag storage pool (2), an intermediate heat storage medium continuous injection machine (3), a agglomeration machine (4), a crushing device (5), a heat extraction machine (6), a separation device (13), a waste heat boiler (14), a power generation system (22) and a hot air control processing system (21);

blast furnace (1) links to each other with blast furnace slag reservoir (2), blast furnace slag reservoir (2) link to each other with make the briquetting machine (4), middle heat-retaining medium continuous injection machine (3) are located make the briquetting machine top, make briquetting machine (4) tip pass through breaker (5) and with get heat engine (6) and link to each other, separator (13) are connected with getting heat engine (6) bottom, it links to each other with exhaust-heat boiler (14) to get heat engine (6) tip, the air outlet of exhaust-heat boiler (14) is connected with hot-air control processing system (21), the steam outlet of exhaust-heat boiler (14) is connected with power generation system (22).

2. The cogeneration system using sensible heat recovery from blast furnace slag according to claim 1, wherein said intermediate heat storage medium continuous injection machine (3) uses steel balls with a diameter of 30mm as the intermediate heat storage medium.

3. The cogeneration system using the sensible heat recovery of blast furnace slag according to claim 1, characterized in that said agglomeration machine (4) is externally provided with a protective heat shield (20).

4. The cogeneration system utilizing sensible heat recovery of blast furnace slag according to claim 1, the heat extractor (6) is of a sectional structure and is divided into a high-temperature air section, a medium-temperature air section and a low-temperature air section, the high-temperature air section comprises a first high-temperature air inlet (10) and a first high-temperature air outlet (7), the medium-temperature air section comprises a second medium-temperature air inlet (11) and a second medium-temperature air outlet (8), the low-temperature air section comprises a third low-temperature air inlet (12) and a third low-temperature air outlet (9), wherein a first high-temperature air outlet (7) and a second medium-temperature air outlet (8) of the heat extractor (6) are respectively connected with a waste heat boiler (14), a third low-temperature air outlet (9) of the heat extractor (6) is connected with a first high-temperature air inlet (10), the second medium-temperature air inlet (11) is connected to a hot air control processing system (21).

5. The cogeneration system for sensible heat recovery from blast furnace slag according to claim 1, wherein said power generation system (22) comprises a steam turbine (16) and a generator (17), said steam turbine (16) being connected to said waste heat boiler (14) through a steam pipe (15), said generator (17) being connected to said steam turbine (16).

6. The cogeneration system with sensible heat recovery from blast furnace slag according to claim 1, wherein said hot air control processing system (21) comprises a dust collector (18) and a chimney (19), an inlet of the dust collector (18) is connected to an air outlet of the waste heat boiler (14), an outlet of the dust collector (18) is connected to the chimney (19), and the dust collector (18) is further connected to the second medium temperature air inlet (11).