Cooling system of oxygen-enriched side-blown converter

Abstract

The utility model belongs to the related technical field of heat treatment, and particularly relates to a cooling system of an oxygen-enriched side-blown converter. The oxygen-enriched side-blown furnace cooling system comprises a furnace wall cooling circulation unit and a flue cooling circulation unit, the furnace wall cooling circulation unit and the flue cooling circulation unit are each provided with an independent furnace wall water inlet pipeline (51) and an independent flue water inlet pipeline (52), and the furnace wall water inlet pipeline (51) is provided with a first electric control valve (91) interlocked with a first thermocouple (93) located at the tail end of a furnace wall water supply pipeline (30). And the flue water inlet pipeline (52) is provided with a second electric control valve (92) which is interlocked with a second thermocouple (94) positioned at the tail end of the flue water supply pipeline (40). One water inlet pipeline in the prior art is divided into two independent water inlet pipelines, furnace wall cooling and flue cooling are both controlled by the independent water inlet pipelines, respective regulation and control are facilitated, the load of a circulating water pump is reduced, power consumption is saved, and related equipment is protected.

Description

Technical Field

[0001] The utility model belongs to the technical field related to heat treatment, and particularly relates to an oxygen-enriched side-blowing furnace cooling system. Background Art

[0002] In the prior art, it is necessary to cool the furnace wall and its flue gas pipeline of the oxygen-enriched side-blowing furnace. A circulating water cooling device for an oxygen-enriched side-blowing furnace disclosed in Chinese patent document CN214701770U is used to cool down the furnace body. The furnace body includes an inner furnace shell and an outer furnace shell. The circulating pipes are evenly arranged in the cavity between the inner furnace shell and the outer furnace shell. The cooling water is pumped into the water inlet pipe by a water pump, and then the cooling water cools the furnace body through the circulating pipes. After that, the cooling water is discharged through the water outlet pipe to realize the circulating cooling of the furnace body. Chinese patent document CN114608336A discloses a flue gas treatment system for smelting low-grade heavy metal solid waste in an oxygen-enriched side-blowing furnace, which sequentially includes a heat exchange device, a sedimentation device, and a spraying device. Among them, the main body of the heat exchange device is a steel water-cooled flue, and the steel water-cooled flue is connected to a sedimentation chamber and a spraying tower. Through secondary sedimentation and secondary spraying, the cooling, dust removal, and desulfurization treatment of high-temperature flue gas are realized.

[0003] In engineering practice, generally the same set of systems is used to cool the furnace wall and its flue gas pipeline of the oxygen-enriched side-blowing furnace. A typical treatment system is as Figure 1 shown, including a furnace wall water-cooling jacket 10, a flue water-cooling jacket 20, a furnace wall water supply pipeline 30, and a flue water supply pipeline 40. Among them, the same water inlet pipeline 50 supplies water to the furnace wall water supply pipeline 30 and the flue water supply pipeline 40. The furnace wall water supply pipeline 30 and the flue water supply pipeline 40 are both connected to a water equalizer 60. The cooling water in the furnace wall water supply pipeline 30 and the flue water supply pipeline 40 finally returns to the cooling water return pool 70. The cooling water in the cooling water return pool 70 is pumped back to the water inlet pipeline 50 after cooling to realize the circulation of the cooling water. In practice, the circulating water volume is generally not adjusted. After the first adjustment is completed, the cooling water volume remains stable. The adverse effects brought about by this are as follows: During the furnace drying and furnace start-up heating process, the heat carried away by the cooling water in the furnace wall water-cooling jacket is large, resulting in an extended furnace start-up heating time and increased energy consumption. When the circulating water volume of the flue gas water-cooling jacket is fixed, there is no adjustment effect on the cooling effect of the flue gas, resulting in large fluctuations in the inlet temperature of the flue gas entering the bag filter during the material change or the furnace charge dropping process. If the flue gas temperature is low, it will cause the bag filter to be clogged; if the flue gas temperature is high, it is necessary to manually open the ash discharge valve of the surface cooler and reduce the temperature by introducing air, resulting in a high equipment failure rate and a large manual operation intensity. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide an oxygen-enriched side-blowing furnace cooling system, which can adjust the cooling water supply in real time according to different working stages of the oxygen-enriched side-blowing furnace and the cooling effect of high-temperature flue gas, and improve the matching degree between the cooling water volume and the actual cooling demand.

[0005] The solution of the utility model to solve the above technical problem is as follows:

[0006] The oxygen-enriched side-blown furnace cooling system includes

[0007] The furnace wall cooling circulation unit includes a furnace wall water-cooling jacket and a cooling return water tank. The cooling return water tank is connected to the furnace wall water inlet pipeline, and the furnace wall water inlet pipeline is connected to the furnace wall water supply pipeline, so that cooling water can circulate between the furnace wall water-cooling jacket and the cooling return water tank;

[0008] The flue cooling circulation unit includes a flue water-cooling jacket and a cooling return water tank. The cooling return water tank is connected to the flue water inlet pipeline, and the flue water inlet pipeline is connected to the flue water supply pipeline, so that cooling water can circulate between the flue water-cooling jacket and the cooling return water tank;

[0009] Wherein, the furnace wall water inlet pipeline is equipped with a first electric control valve and a first water equalizer. The furnace wall water supply pipeline is connected to the first water equalizer. A first thermocouple is arranged at the end of the furnace wall water supply pipeline. The first electric control valve is interlocked with the first thermocouple; the flue water inlet pipeline is equipped with a second electric control valve and a second water equalizer. The flue water supply pipeline is connected to the second water equalizer. A second thermocouple is arranged at the end of the flue water supply pipeline. The second electric control valve is interlocked with the second thermocouple.

[0010] As an improvement, a first water collecting tank is arranged at the end of the furnace wall water supply pipeline, and the first thermocouple is located on the first water collecting tank; a second water collecting tank is arranged at the end of the flue water supply pipeline, and the second thermocouple is located on the second water collecting tank; both the first water collecting tank and the second water collecting tank are connected to the cooling return water tank.

[0011] As an improvement, the flue water-cooling jacket is divided into at least 2 sections, and the cooling water in the upper section does not flow through the lower section of the flue water-cooling jacket but flows to the cooling return water tank.

[0012] As a further improvement, the flue water-cooling jacket is divided into 3 sections, which are respectively located between the furnace body and the sedimentation cylinder, between the sedimentation cylinder and the surface cooler, and between the surface cooler and the bag filter.

[0013] As a further improvement, the flue water-cooling jacket is in a zigzag shape, and the shape of the flue is adapted to the shape of the flue water-cooling jacket, so that the flue water-cooling jacket always wraps around the outer surface of the flue and / or is hidden in the middle of the flue.

[0014] As an improvement, it further includes a dilution air pipeline for introducing external air into the flue, and the dilution air pipeline is equipped with a dilution air valve.

[0015] As a further improvement, it further includes a sedimentation cylinder jacket and a Roots blower for introducing external air into the sedimentation cylinder jacket. The sedimentation cylinder jacket is connected to the combustion-supporting air pipeline of the furnace body.

[0016] The beneficial effects of the utility model:

[0017] (1) Divide an inlet water pipeline in the prior art into two independent inlet water pipelines. The furnace wall cooling and the flue duct cooling both have independent inlet water pipeline controls, which is convenient for separately regulating according to their different operating conditions.

[0018] (2) An electromagnetic valve is set, and its opening degree can be changed according to the actual operating conditions to regulate the respective circulating water volumes, so as to improve the matching degree between the cooling water volume and the actual cooling demand. During the furnace drying or starting process, the temperature inside the furnace is relatively low. The circulating water volume of the furnace wall water-cooling jacket can be reduced to reduce heat loss and save fuel consumption, which is beneficial to increasing the temperature inside the furnace. In the flue duct cooling, the temperature of the flue gas entering the bag filter can be effectively controlled to prevent the bag of the bag filter from being clogged or burned.

[0019] (3) A dilution air valve is also set in front of the bag filter, which can be used as an auxiliary measure to control the inlet air temperature of the bag filter. When the flue gas temperature cannot be reduced to the target temperature, air is mixed in to quickly reduce the flue gas temperature and prevent the bag filter from burning the bag. Description of the Drawings

[0020] Figure 1 It is a layout schematic diagram of the oxygen-enriched side-blown furnace cooling system in the prior art;

[0021] Figure 2 It is a layout schematic diagram of Embodiment 1 of the present utility model;

[0022] Figure 3 It is a layout schematic diagram of Embodiment 2 of the present utility model.

[0023] In the figure: 10, furnace wall water-cooling jacket; 20, flue duct water-cooling jacket; 30, furnace wall water supply pipeline; 40, flue duct water supply pipeline; 50, inlet water pipeline; 51, furnace wall inlet water pipeline; 52, flue duct inlet water pipeline; 60, water equalizer; 61, first water equalizer; 62, second water equalizer; 70, cooling water return pool; 81, first water collecting tank; 82, second water collecting tank; 91, first electric control valve; 92, second electric control valve; 93, first thermocouple; 94, second thermocouple; 01, furnace body; 02, settling cylinder; 021, settling cylinder jacket; 022, Roots blower; 03, surface cooler; 04, bag filter; 041, dilution air pipeline; 042, dilution air valve; 05, deacidification tower. Detailed Embodiments Embodiment 1

[0024] The oxygen-enriched side-blown furnace cooling system described in this application includes a furnace wall cooling circulation unit and a flue duct cooling circulation unit, and the two different units share a cooling water return pool 70.

[0025] Such as Figure 2As shown in the figure, the furnace wall cooling circulation unit includes a furnace wall water inlet pipeline 51, a furnace wall water cooling jacket 10, and a cooling return water tank 70. The three are connected by a furnace wall water supply pipeline 30. The cooling return water tank 70 is connected to the furnace wall water inlet pipeline 51 (not shown in the figure), so that cooling water can circulate between the furnace wall water cooling jacket 10 and the cooling return water tank 70. The furnace wall water inlet pipeline 51 is equipped with a first electric control valve 91 and a first water equalizer 61. The furnace wall water supply pipeline 30 is connected to the first water equalizer 61. The tail end of the furnace wall water supply pipeline 30 is provided with a first water collecting tank 81. A first thermocouple 93 is arranged on the first water collecting tank 81. The first electric control valve 91 is interlocked with the first thermocouple 93. To prevent the furnace wall water cooling jacket 10 from dry burning and causing accidents, the first electric control valve 91 is set with a minimum opening value of 30° to ensure the circulation of the cooling water in the jacket. The temperature adjusted by the first thermocouple 93 can be set at 60°C. When the temperature detected by the first thermocouple 93 is lower than the set value, the first electric control valve 91 reduces the opening value to reduce the circulation water volume; when the first thermocouple 93 is higher than the set value, the first electric control valve 91 increases the opening value to increase the circulation water volume.

[0026] The flue cooling circulation unit includes a flue water inlet pipeline 52, a flue water cooling jacket 20, and a cooling return water tank 70. The three are connected by a flue water supply pipeline 40. The cooling return water tank 70 is connected to the flue water inlet pipeline 52 (not shown in the figure), so that cooling water can circulate between the flue water cooling jacket 20 and the cooling return water tank 70. The flue water inlet pipeline 52 is equipped with a second electric control valve 92 and a second water equalizer 62. The flue water supply pipeline 40 is connected to the second water equalizer 62. The tail end of the flue water supply pipeline 40 is provided with a second water collecting tank 82. A second thermocouple 94 is arranged on the second water collecting tank 82. The second electric control valve 92 is interlocked with the second thermocouple 94. The first water collecting tank 81 and the second water collecting tank 82 are both connected to the cooling return water tank 70. To prevent the flue water cooling jacket 20 from dry burning and causing accidents, the second electric control valve 92 is set with a minimum opening value of 30° to ensure the circulation of the cooling water in the jacket. The temperature adjusted by the second thermocouple 94 can be set at 190°C. When the temperature detected by the second thermocouple 94 is lower than the set value, the second electric control valve 92 reduces the opening value to reduce the circulation water volume; when the temperature detected by the second thermocouple 94 is higher than the set value, the second electric control valve 92 increases the opening value to increase the circulation water volume.

[0027] At the connection between the flue and the bag filter 04, a dilution air pipeline 041 for introducing external air into the flue is also provided. The dilution air pipeline 041 is equipped with a dilution air valve 042. The dilution air valve 042 is a control valve. When the opening of the second electric control valve 92 is fully open and the temperature of the second thermocouple 94 is still higher than the set value, the dilution air valve 042 is opened, which can quickly reduce the temperature of the second thermocouple 94 below the set value.

[0028] The settling cylinder 02 between the flue ducts is also provided with a settling cylinder jacket 021. The Roots blower 022 introduces external air into the settling cylinder jacket 021 to cool down the high-temperature flue gas flowing through the settling cylinder 02. The settling cylinder jacket 021 is communicated with the combustion-supporting air pipeline of the furnace body 01, and the heated air is used as the combustion-supporting air of the furnace body 01.

[0029] As a common technical means, a surface cooler 03 is also provided between the flue ducts to cool down the high-temperature flue gas. The high-temperature flue gas is then discharged after being dust-removed by the bag filter 04 and deacidified and cooled by the deacidification tower 05. Embodiment 2

[0030] As Figure 3 As shown in the figure, the difference between Embodiment 2 and Embodiment 1 is that the flue water-cooling jacket 20 is divided into three sections. The first section is located between the furnace body 01 and the settling cylinder 02, the second section is located between the settling cylinder 02 and the surface cooler 03, and the third section is located between the surface cooler 03 and the bag filter 04. Each section is in a herringbone shape, so that the overall flue water-cooling jacket 20 is in a zigzag shape. Each herringbone-shaped flue water-cooling jacket 20 has an independent cooling water inlet and a cooling water outlet, and the cooling water of the previous section does not flow through the flue water-cooling jacket 20 of the next section but flows to the cooling water return pool 70.

[0031] Obviously, the shape of the flue is naturally adapted to the shape of the flue water-cooling jacket 20 and is also in a zigzag shape. The flue water-cooling jacket 20 is always wrapped around the outer surface of the flue and / or hidden in the middle of the flue. This is the prior art and will not be elaborated here. The technical effects of the flue being in a zigzag shape are: (1) When there is ash accumulation inside, the inclined angle will cause the soot to slide downwards, reducing the ash accumulation speed in the flue; (2) If a maintenance opening is provided at the top of the zigzag shape, it will be relatively convenient to clean the flue from the maintenance opening.

Claims

1. Oxygen-enriched side-blown converter cooling system, characterized in that: including a furnace wall cooling circulation unit, including a furnace wall water-cooled jacket (10) and a cooling return water tank (70), the cooling return water tank (70) is connected to a furnace wall water inlet pipeline (51), and the furnace wall water inlet pipeline (51) is connected to a furnace wall water supply pipeline (30), so that cooling water can circulate between the furnace wall water-cooled jacket (10) and the cooling return water tank (70); a flue cooling circulation unit, including a flue water-cooled jacket (20) and a cooling return water tank (70), the cooling return water tank (70) is connected to a flue water inlet pipeline (52), and the flue water inlet pipeline (52) is connected to a flue water supply pipeline (40), so that cooling water can circulate between the flue water-cooled jacket (20) and the cooling return water tank (70); wherein, the furnace wall water inlet pipeline (51) is provided with a first electric control valve (91) and a first water equalizer (61), the furnace wall water supply pipeline (30) is connected to the first water equalizer (61), a first thermocouple (93) is arranged at the tail end of the furnace wall water supply pipeline (30), and the first electric control valve (91) is interlocked with the first thermocouple (93); the flue water inlet pipeline (52) is provided with a second electric control valve (92) and a second water equalizer (62), the flue water supply pipeline (40) is connected to the second water equalizer (62), a second thermocouple (94) is arranged at the tail end of the flue water supply pipeline (40), and the second electric control valve (92) is interlocked with the second thermocouple (94).

2. The oxygen-enriched side-blown furnace cooling system according to claim 1, wherein: A first water collecting tank (81) is arranged at the tail end of the furnace wall water supply pipeline (30), and the first thermocouple (93) is located on the first water collecting tank (81); a second water collecting tank (82) is arranged at the tail end of the flue water supply pipeline (40), and the second thermocouple (94) is located on the second water collecting tank (82); the first water collecting tank (81) and the second water collecting tank (82) are both connected to the cooling return water tank (70).

3. The oxygen-enriched side-blown converter cooling system according to claim 1, wherein: The flue water-cooled jacket (20) is divided into at least 2 sections, and the cooling water in the upper section does not flow through the lower section of the flue water-cooled jacket (20) but flows to the cooling return water tank (70).

4. The oxygen-enriched side-blown furnace cooling system according to claim 3, characterized in that: The flue water-cooled jacket (20) is divided into 3 sections, which are respectively located between the furnace body (01) and the settling cylinder (02), between the settling cylinder (02) and the surface cooler (03), and between the surface cooler (03) and the bag filter (04).

5. The oxygen-enriched side-blown furnace cooling system according to claim 1 or 2, characterized in that: The flue water-cooled jacket (20) is in a zigzag shape, and the shape of the flue is adapted to the shape of the flue water-cooled jacket (20), so that the flue water-cooled jacket (20) always wraps around the outer surface of the flue and / or is hidden in the middle of the flue.

6. The oxygen-enriched side-blown furnace cooling system according to claim 1, characterized in that: It also includes a dilution air pipeline (041) for introducing external air into the flue, and the dilution air pipeline (041) is provided with a dilution air valve (042).

7. The oxygen-enriched side-blown furnace cooling system according to claim 4, characterized in that: It also includes a settling cylinder jacket (021) and a Roots blower (022) for introducing external air into the settling cylinder jacket (021), and the settling cylinder jacket (021) is connected to the combustion-supporting air pipeline of the furnace body (01).

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