CN203768382U - Combined cooling, heating and power system for blast furnace rotary drum process slag flushing water waste heat utilization - Google Patents

Abstract

The utility model relates to a triple-supply system for utilization of residual heat of slag flushing water by a drum method of a blast furnace, which comprises a granulation tower. The heat regulating tank includes a sedimentation heat storage tank and a granulation water storage tank, the sedimentation heat storage tank is connected to the first inlet of the heat exchange device through a waste heat water supply pump group, and the first outlet of the heat exchange device is connected to the granulation water storage tank The second inlet of the heat exchange device is connected to the first outlet of the heating user and the refrigeration mechanism respectively through the heating water supply pump group, the first inlet of the heating user and the refrigeration mechanism are connected with the second outlet of the heat exchange device, and the refrigeration mechanism The second inlet is connected with the indoor refrigeration user and the dehumidification blast user, and the indoor refrigeration user and the dehumidification blast user are connected with the second outlet of the refrigeration mechanism. It is connected with the granulation tower. The system is used for combined heating, cooling or blast furnace dehumidification and blasting, and the water quality is stable.

Description

Triple-supply system for waste heat utilization of slag flushing water by blast furnace drum method

technical field

The utility model relates to a waste heat utilization system, in particular to a triple supply system for utilization of waste heat of slag flushing water by a blast furnace drum method.

Background technique

Energy is the basis for human survival. my country has the world's second largest energy system, but its per capita energy resources are only half of the world's level, and its overall energy use efficiency is seriously low compared to developed countries. Facing this reality, the task of saving energy is urgent and arduous. As a pillar industry of the national economy, the iron and steel industry plays an important role in my country's modernization drive, but it is also a major energy consumer and polluter. It will generate a lot of waste heat and energy while consuming energy and promoting material transformation. At present, the recycling rate of waste heat and waste energy of iron and steel is quite low. For example, the waste heat of blast furnace slag washing water is mostly consumed. Therefore, there is a huge recovery potential for the low-temperature waste heat in the iron and steel industry.

The drum process is one of the slag treatment processes in iron and steel plants at present. This process is to directly send high-temperature liquid slag to the granulation tower, and in the granulation tower, it is quenched and cooled by the high-speed water flow injected into the granulation tower to form granular water slag, slag The water mixture is transported to the drum for separation of slag and water, and the separated slag is transported away by the water slag belt, while the temperature of the remaining slag flushing water can generally reach about 90°C, and the high temperature slag flushing water enters the hot water from the slag flushing ditch. The water tank is recycled and reused by the granulation water supply pump after preliminary sedimentation. In the blast furnace smelting process, about 0.3t of blast furnace slag is produced for every 1 ton of molten iron produced, and the heat taken away by the blast furnace slag accounts for about 16% of the total energy consumption of the blast furnace. The recycling of energy is released into the atmosphere, which not only wastes energy, but also causes waste of water resources and heat pollution. Therefore, we need a waste heat utilization system for blast furnace slag flushing water that can save energy and protect the environment.

At present, domestic utilization of waste heat from blast furnace slag flushing water is mainly concentrated in northern iron and steel enterprises. They only use the heat of blast furnace slag flushing water as a heating source in winter, and do not use it as a heat source for indoor cooling or dehumidification blast in summer. The "triple supply" of slag water leads to poor utilization of waste heat, so it is necessary to further develop the potential of waste heat utilization of slag flushing water. In the actual application projects of the existing slag washing water, some steel mills use the slag washing water as a heat medium and send it directly to the heating end. Because the slag water contains a lot of impurities, it is very easy to cause all the heat exchangers and terminal equipment to be blocked, resulting in failure of the heating system. And when the heat exchanger has been used for a period of time, it can only be replaced due to serious fouling, which is expensive. For the impurities and suspended solids contained in the slag flushing water, if the conventional fine filter material is used for filtering, it is very easy to cause the slag particles to harden in the filter device, making the filter system invalid; A large amount of medicament volatilizes under high temperature conditions, and the cost is huge. Therefore, it is necessary to develop an efficient and feasible waste heat utilization system of blast furnace slag flushing water, which can be used for heating in winter and indoor cooling or dehumidification blast in summer to improve energy utilization efficiency.

Utility model content

The technical problem to be solved by the utility model is to provide a reliable water quality, stable and feasible blast furnace drum slag flushing waste heat utilization triple supply system, the system can use high temperature slag flushing water for heating in winter, and for indoor cooling or heating in summer Dehumidification blast.

The technical solution adopted by the utility model is: a triple supply system for utilization of residual heat of slag flushing water by the drum method of blast furnace, which includes a granulation tower, and the granulation tower is connected with the drum and the hot water tank in turn. The hot water tank is connected with the heat storage regulating tank, and the heat storage regulating tank includes a sedimentation heat storage tank and a granulation water storage tank, and the outlet of the sedimentation heat storage tank passes through the waste heat water supply pump group and the first heat exchange device One inlet is connected, the first outlet of the heat exchange device is connected with the inlet of the granulation storage tank, the second inlet of the heat exchange device is respectively connected with the outlet of the heating user and the first outlet of the refrigeration mechanism through the heating water supply pump group, the heating The user's inlet and the first inlet of the refrigeration mechanism are connected with the second outlet of the heat exchange device, the second inlet of the refrigeration mechanism is connected with the indoor cooling user's outlet and the dehumidification blast user's outlet, and the indoor cooling user's inlet is connected with the dehumidification drum The air user inlet is connected with the second outlet of the refrigeration mechanism, and the outlet of the granulation reservoir is connected with the granulation tower through the granulation water supply pump group.

According to the above scheme, the sedimentation heat storage tank and the granulation water storage tank are connected through a partition wall, and the upper part of the sedimentation heat storage tank and the granulation water storage tank are connected.

According to the above scheme, the granulation storage tank is connected to the steam recovery device located at the top of the granulation tower through the steam recovery spray pump group, which not only makes full use of the latent heat of the system, but also reduces steam dissipation to achieve energy saving and environmental protection.

According to the above scheme, the inlet of the sedimentation heat storage tank, that is, the outlet end of the hot water tank, is provided with a filter residue grid plate, which can improve the water quality of the sedimentation heat storage tank.

According to the above scheme, an insulation cover plate is provided above the hot water tank, sedimentation heat storage tank and granulation storage tank, and an insulation shell is provided on the wall surface of the hot water tank, sedimentation heat storage tank and sedimentation heat storage tank , in order to reduce the heat dissipation of slag flushing hot water.

Following the above scheme, the heat exchange device adopts a plate or tube heat exchange device, which has the characteristics of high heat exchange efficiency, corrosion resistance, and not easy to scale.

According to the above solution, a filter device is arranged between the waste heat water supply pump group and the heat exchange device.

According to the above scheme, the filter device uses large-grained quartz sand and grained steel as filter material or self-cleaning filter to further improve water quality, reduce adverse effects of fouling, prolong the service life of the heat exchanger, and save costs.

According to the above scheme, the first inlet of the heat exchange device is connected to the outlet of the chemical cleaning device through the chemical cleaning pump group, and the inlet of the chemical cleaning device is connected to the first outlet of the heat exchange device. The chemical cleaning device regularly cleans the heat exchanger, prolongs the service life of the heat exchanger, saves costs, and solves the scaling problem of the heat exchanger.

Following the above scheme, the high-temperature slag-washing water is used for heating in winter, and used for indoor cooling or dehumidification blasting in summer, realizing the "triple supply" of waste heat utilization of slag-washing water, so that the waste heat of slag-washing water can be utilized throughout the year, and the waste heat utilization efficiency high.

The high-temperature slag washing water from the drum directly enters the hot water tank, and the water in the hot water tank overflows into the sedimentation heat storage tank. After the waste heat water supply pump unit absorbs water from the sedimentation heat storage tank for use by users, the return water enters the granulation storage tank. The heat storage regulating tank is divided into a sedimentation heat storage tank and a granulation storage tank, with a partition wall in the middle and a connected top. When the waste heat water supply pump unit is not working, the water in the sedimentation heat storage tank can overflow into the granulation storage tank, which does not affect the use of the slag treatment granulation circulation system. The residual heat of slag flushing water utilizes a self-contained circulation system, which is not related to the slag treatment granulation circulation system, and does not affect the operation of the slag treatment system at any time.

The heat storage regulating tank has the function of sedimentation and heat storage, which overcomes the shortcomings of incomplete slag removal in the drum and hot water tank, improves the water quality of the system, improves the safety of the system, and ensures the stable operation of subsequent users. The heat storage regulating pool increases the amount of hot water storage, overcomes the lack of hot water source and unstable water temperature caused by the discontinuous slag discharge of the blast furnace, and can provide a stable heat source for heating and cooling users. The system is equipped with heat exchange facilities. The heat exchange facilities adopt plate or tube heat exchange devices, which have the characteristics of high heat exchange efficiency, corrosion resistance and not easy to scale.

The utility model is to install a heat storage regulating pool behind the granulation tower, drum and hot water tank. The heat storage regulating pool is divided into two parts: a sedimentation heat storage pool and a granulation water storage pool. The water is accumulated in the sedimentation heat storage tank of the heat storage adjustment tank through the sedimentation overflow. After being pressurized by the waste heat water supply pump group, it enters the heat exchange device after being pressurized by the filtration facility. After the heat exchange, the cooled slag water is used to return to the granulation water storage In the pool, the slag is flushed by the granulation water supply pump set; in summer, the cooling medium in the heat exchange device after exchange and temperature rise is transported to the refrigeration mechanism through the heating water supply pump set for refrigeration and blast furnace blast dehumidification. In winter, the cooling medium heated by heat exchange in the heat exchange device is transported to the heating user through the heating water supply pump set to realize the "triple supply" of waste heat utilization of blast furnace slag flushing water; when the waste heat water supply pump set is not working, the precipitation heat storage The water in the pool can overflow into the granulation storage tank, which does not affect the use of the slag treatment granulation circulation system; the slag washing water in the granulation storage tank is transported to the steam recovery spray pump set at the top of the granulation tower. Recovery device to reduce steam dissipation and make full use of system latent heat. In addition, the system is equipped with a chemical cleaning device, which regularly cleans the heat exchanger through the chemical cleaning pump group to avoid the hardening of slag particles caused by the long-term use of the heat exchanger.

The beneficial effects of the utility model are as follows: 1. The slag flushing waste heat utilization triple supply system of the blast furnace drum method forms a self-contained circulation system, which is not related to the slag treatment granulation circulation system, and does not affect the operation of the slag treatment system at any time. 2. The high-temperature slag washing water is used for heating in winter, and in summer for indoor cooling or dehumidification blast, realizing the "triple supply" of waste heat utilization of blast furnace slag washing water, so that the waste heat of slag washing water can be utilized throughout the year, and the waste heat utilization efficiency is high. 3. The sedimentation heat storage pool and the granulation water storage pool are collectively called the heat storage adjustment pool, which increases the amount of hot water storage, overcomes the influence of insufficient hot water source and unstable water temperature caused by discontinuous blast furnace slag discharge, and can provide heating for heating. And cooling users to provide a stable heat source. 4. The heat storage regulating pool has the function of sedimentation and heat storage, and the outlet main pipe of the waste heat water supply pump set is equipped with a filtration device to further improve the water quality of the system, improve the safety of the system, and ensure the stable operation of subsequent users. 5. The system is equipped with a steam recovery spray pump group, which can make full use of the latent heat of the slag system and reduce steam dissipation, which is not only energy-saving but also environmentally friendly. 6. In view of the fact that the heat exchange equipment is used for washing slag water, the system is equipped with a chemical cleaning device to regularly clean the inside of the heat exchange device, prolong the service life of the heat exchange device, save costs, and solve the problem of scaling of the heat exchange device.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

In the figure: 1. Granulation tower; 2. Drum; 3. Hot water tank; 4. Filter residue grid; 5. Sedimentation heat storage tank; 6. Granulation storage tank; 9. Heat exchange device; 10. Refrigeration mechanism; 11. Heating user; 12. Indoor cooling user; 13. Dehumidification blast user; 14. Heating water supply pump unit; 15. Chemical cleaning device; 16. Chemical cleaning pump 17. Granulation water supply pump group; 18. Steam recovery spray pump group; 19. Steam recovery device; 20~42. Cut-off valve; 50. Heat storage adjustment pool; 101. Hot water absorption refrigeration unit; 102 , Cooling medium delivery pump.

Detailed ways

Further illustrate the embodiment of the present utility model below in conjunction with accompanying drawing.

Example 1

Referring to Fig. 1 , a three-coupling system for utilization of residual heat from blast furnace drum slag flushing water, it includes a granulation tower 1 matched with the blast furnace, and the granulation tower 1 is sequentially connected with a drum 2, a hot water tank 3, and a heat storage tank. The adjustment tank 50 is connected, and the heat storage adjustment tank 50 includes a sedimentation heat storage tank 5 and a granulation water storage tank 6, and the precipitation heat storage tank 5 and the granulation water storage tank 6 are connected by a partition wall, and the precipitation The heat storage tank 5 communicates with the upper part of the granulation storage tank 6; the outlet of the sedimentation heat storage tank 5 is connected to the first inlet of the heat exchange device 9 through the waste heat water supply pump group 7 and the filter device 8, and the heat exchange device The first inlet of 9 is communicated with the outlet of chemical cleaning device 15 through chemical cleaning pump group 16, and the first outlet of heat exchange device 9 is connected with the inlet of granulation storage tank 6 and the inlet of chemical cleaning device 15, and the heat exchange The second inlet of the device 9 is respectively connected to the outlet of the heating user 11 and the first outlet of the refrigeration mechanism 10 through the heating water supply pump group 14, and the inlet of the heating user 11 and the first inlet of the refrigeration mechanism 10 are connected to the second inlet of the heat exchange device 9. The outlets are connected, the second inlet of the refrigeration mechanism 10 is connected with the outlet of the indoor refrigeration user 12 and the outlet of the dehumidification blast user 13, and the inlet of the indoor refrigeration user 12 and the inlet of the dehumidification blast user 13 are connected with the second outlet of the refrigeration mechanism 10 pass; the outlet of the granulation storage tank 6 is connected with the granulation tower 1 through the granulation water supply pump group 17; 1 The steam recovery device 19 at the top is connected to each other, which not only makes full use of the latent heat of the system, but also reduces steam dissipation, so as to realize energy saving and environmental protection.

In the utility model, the inlet of the sedimentation heat storage tank 5, that is, the outlet end of the hot water tank 3 is provided with a filter residue grid, 4, which can improve the water quality of the sedimentation heat storage tank. The top of the hot water tank 3, the precipitation heat storage tank 5 and the granulation storage tank 6 is provided with an insulation cover plate, and the walls of the hot water tank 3, the precipitation heat storage tank 5 and the precipitation heat storage tank 6 are provided with insulation Shell, in order to reduce the heat dissipation of slag flushing hot water. The filter device 8 uses large-grained quartz sand and grained steel as a filter material or a self-cleaning filter to further improve water quality, reduce adverse effects of fouling, prolong the service life of the heat exchanger, and save costs. The chemical cleaning device 16 regularly cleans the heat exchange device 9 to prolong the service life of the heat exchange device 9 , save costs, and solve the problem of fouling of the heat exchange device 9 . The refrigeration mechanism 10 includes a hot water absorption refrigeration unit 101 and a cooling medium delivery pump 102 .

The slag washing water contacts the high-temperature molten blast furnace slag in the granulation tower 1 to generate a large amount of steam and high-temperature slag washing water. Separation, the slag is transported to the water slag yard by the belt, and the water enters the hot water tank 3 under the drum. Most of the slag particles remaining in the slag flushing water are deposited at the bottom of the hot water tank 3, and the water overflows and accumulates in the In the sedimentation heat storage tank 5, the sedimentation heat storage tank 5 has the function of sedimentation and heat storage, which further improves the system water quality and stabilizes the water temperature. The waste heat water supply pump group 7 takes water from the bottom of the sedimentation heat storage tank 5, and after the pressure is raised, it is sent outward through the filter device 8 and then enters the heat exchange device 9. In the heat exchange device 9, the slag flushing water and desalinated water (soft water) are heated. Exchange, the temperature of the slag flushing water decreases, and the temperature of the desalinated water (soft water) increases; In summer, the heated desalted water (soft water) generates cold energy through the refrigeration mechanism 10, and the cold energy is transported to the indoor cooling user 12 or the dehumidification blast user 13 through the refrigerant medium. At this time, the shut-off valve 26 and the shut-off valve 28 are opened to cut The valve 25 and the cut-off valve 27 are closed, and the used desalted water (soft water) returns to the heat exchange device 9 through the heating water supply pump unit 14 for heat exchange again, forming a refrigeration cycle system. In winter, the refrigeration mechanism 10 suspends work, closes the shut-off valve 26 and the shut-off valve 28, opens the shut-off valve 25 and the shut-off valve 27, and the heated desalted water (soft water) enters the heating user 11, and then the return water passes through the heating water supply pump group 14 again Go back to the heat exchange device 9 to perform heat exchange again, forming another closed heating cycle system. The granulation water supply pump unit 17 takes water from the bottom of the granulation storage tank 6, and after the pressure is increased, it enters the granulation tower 1 through the delivery pipeline to form a slag treatment granulation circulation system. In some months in spring and autumn, or when the refrigeration unit and the heating system need to be overhauled, the refrigeration unit and the heating system may not need to run. The slag flushing water overflows into the granulation reservoir 6 to ensure the normal operation of the blast furnace slag treatment system. After the heat exchange device has been running for a period of time, the heat exchange device needs to be cleaned (when the heat exchange device is in normal use, open the shut-off valve 22 and shut-off valve 24, and close the shut-off valve 35 and shut-off valve 37). At this time, the shut-off valve 22 and the shut-off valve 24 are closed, the shut-off valve 35 and the shut-off valve 37 are opened, and the chemical cleaning pump unit 16 is opened to clean the heat exchange device. The inlet of the steam recovery spray pump group 18 is taken from the granulation reservoir 6, which transports relatively clean slag flushing water to the steam recovery device 19 at the top of the granulation tower 1 for recovery of high-temperature steam at the top of the tower.

The conveying pipelines used in the utility model all need heat preservation and moisture-proof treatment to reduce heat loss during pipeline transmission.

To sum up, this system realizes the "triple supply" of waste heat utilization of blast furnace slag flushing water, so that the waste heat of slag flushing water can be utilized throughout the year, with high thermal efficiency, and the steam at the top of the granulation tower can be fully recovered to achieve energy saving and environmental protection; the system is equipped with sedimentation, The heat storage and filtration device can further improve the water quality of the system, improve the safety of the system, and ensure the stable operation of subsequent users; the system is equipped with a chemical cleaning device to prolong the service life of the heat exchanger and save costs. Therefore, the present invention provides a system for utilizing waste heat of blast furnace slag flushing water with reliable water quality, stable and feasible, and perfect functions.

Claims (9)

1. A three-supply system for waste heat utilization of slag flushing water by blast furnace drum method, which includes a granulation tower, and the granulation tower is connected with the drum and the hot water tank successively, and it is characterized in that: the hot water tank is connected with the The heat storage regulating tank is connected, and the heat storage regulating tank includes a sedimentation heat storage tank and a granulation water storage tank, and the outlet of the sedimentation heat storage tank is connected to the first inlet of the heat exchange device through a waste heat water supply pump group, The first outlet of the heat exchange device is connected to the inlet of the granulation storage tank, the second inlet of the heat exchange device is respectively connected to the outlet of the heating user and the first outlet of the refrigeration mechanism through the heating water supply pump group, and the inlet of the heating user and the first outlet of the refrigeration mechanism are respectively connected. The first inlet of the refrigeration mechanism is connected with the second outlet of the heat exchange device, the second inlet of the refrigeration mechanism is connected with the indoor refrigeration user outlet and the dehumidification blast user outlet, and the indoor refrigeration user inlet and the dehumidification blast user inlet are connected with the The second outlet of the refrigeration mechanism is connected, and the outlet of the granulation storage tank is connected with the granulation tower through the granulation water supply pump group. 2. The three-supply system for waste heat utilization of blast furnace drum method slag flushing water as claimed in claim 1, characterized in that: the sedimentation heat storage tank and the granulation water storage tank are connected by a partition wall, and the sedimentation heat storage tank and the granulation water storage tank are connected The upper part of the granulation storage tank is connected. 3. The three-supply system for waste heat utilization of blast furnace drum method slag flushing water as claimed in claim 1 or 2, characterized in that: said granulation reservoir is connected with the steam recovery spray pump group and the granulation tower top The vapor recovery unit is connected. 4. The triple supply system for waste heat utilization of blast furnace slag flushing water by drum method as claimed in claim 1 or 2, characterized in that: the entrance of the sedimentation heat storage tank is provided with a filter slag grid. 5. The triple supply system for waste heat utilization of blast furnace slag flushing water by drum method as claimed in claim 1 or 2, characterized in that: a thermal insulation cover is provided above the hot water tank, sedimentation heat storage tank and granulation storage tank plate, and the walls of the hot water tank, sedimentation heat storage tank and sedimentation heat storage tank are provided with insulation shells. 6. The triple supply system for waste heat utilization of blast furnace drum method slag flushing water as claimed in claim 1, characterized in that: a filter device is arranged between the waste heat water supply pump set and the heat exchange device. 7. The triple supply system for waste heat utilization of blast furnace drum slag flushing water as claimed in claim 6, characterized in that: the filter device uses large-grained quartz sand and grained steel as filter material or uses a self-cleaning filter. 8. The triple supply system for waste heat utilization of blast furnace drum slag flushing water as claimed in claim 1, characterized in that: the heat exchange device is a plate or tube heat exchange device. 9. The three-supply system for waste heat utilization of blast furnace drum method slag flushing water as claimed in claim 1 or 8, characterized in that: the first inlet of the heat exchange device is connected to the outlet of the chemical cleaning device through a chemical cleaning pump group Through communication, the inlet of the chemical cleaning device is connected with the first outlet of the heat exchange device.