White smoke removal and demisting system

Abstract

The invention discloses a white smoke removing and demisting system which comprises a cooling assembly, a temperature returning assembly, a waste discharge induced draft fan, a mixer and a chimney. The interior of the silicon steel heat treatment furnace water spray cooling section is communicated with an inlet of a hot and wet air pipeline, an outlet of the hot and wet air pipeline is communicated with an inlet of a cooling assembly, a condensate water outlet of the cooling assembly is connected with a condensate water pipeline, and an outlet of the cooling assembly is communicated with a cold source inlet of a temperature returning assembly. A cold source outlet of the temperature return assembly is communicated with an inlet of the waste discharge induced draft fan; an outlet of the silicon steel heat treatment furnace radiant tube cooling section is communicated with a heat source channel of the temperature returning assembly through a hot dry air pipeline. The invention has the beneficial effects that the hot dry air pipeline for temperature return is generated by the cooling section of the radiant tube of the silicon steel heat treatment furnace, no extra heat is consumed, the energy consumption is low, and the energy-saving effect is achieved.

Description

Technical Field

[0001] The present invention relates to a de-whitening and de-fogging technology, and in particular to a de-whitening and de-fogging system for a water spray cooling section of a silicon steel heat treatment furnace. Background Art With the continuous advancement of air pollution prevention and control work, on the basis of the introduction of ultra-low emission standards, many places have successively included colored smoke plumes in the local monitoring scope in order to continue to reduce emissions in depth, in order to alleviate the "big white smoke" phenomenon of chimneys. "Chimney rain" and "white smoke" not only cause visual pollution to a certain extent, but also seriously affect the image of enterprises.

[0002] For example, cold-rolled electrical steel strip, namely silicon steel, is known as the "crown jewel of steel" and is one of the core materials in the power industry. It is widely used in many power and electrical products such as power generation equipment, power transmission and transformation equipment, and power equipment. The silicon steel heat treatment furnace is the core equipment for realizing the mass production of silicon steel, and plays a key role in improving the magnetic induction of products and reducing iron loss. The first cooling section of the silicon steel heat treatment furnace adopts air cooling, which produces a large amount of high-temperature exhaust gas that is directly discharged; the second cooling section adopts water spray or water mist cooling, which produces a large amount of hot and humid air, and forms a large amount of white mist after discharge, which affects the vision and wastes a lot of water resources.

[0003] At present, the white smoke elimination device commonly used in industry mainly reduces the humidity of the flue gas by condensation cooling, and then heats it on the basis of condensation cooling. However, the reheating equipment of the existing white smoke elimination device requires an additional heat source, which consumes a lot of energy.

[0004] Therefore, it is necessary to improve the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a de-whitening and defogging system to reduce energy consumption in view of the deficiencies in the prior art.

[0006] The technical solution adopted by the present invention is: a whitening and demisting system, including a cooling component, a temperature recovery component, a waste exhaust fan, a mixer and a chimney; The interior of the water spray cooling section of the silicon steel heat treatment furnace is connected to the inlet of the hot and humid air pipeline, the outlet of the hot and humid air pipeline is connected to the inlet of the cooling component, the condensed water outlet of the cooling component is connected to the condensed water pipeline, the outlet of the cooling component is connected to the cold source inlet of the temperature recovery component, the cold source outlet of the temperature recovery component is connected to the inlet of the exhaust induced draft fan, and the outlet of the exhaust induced draft fan is connected to the chimney inlet; The outlet of the cooling section of the radiation tube of the silicon steel heat treatment furnace is communicated with the heat source channel of the temperature recovery component through a hot dry air pipeline.

[0007] According to the above scheme, the reheating component includes a cooling blower and a reheating heat exchanger; the inlet of the cooling blower is connected to the cold air source, the outlet of the cooling blower is connected to the interior of the cooling section of the radiant tube of the silicon steel heat treatment furnace, the interior of the cooling section of the radiant tube of the silicon steel heat treatment furnace is connected to the inlet of the hot dry air pipeline, and the outlet of the hot dry air pipeline is connected to the heat source channel of the reheating heat exchanger; the cold source channel of the reheating heat exchanger is connected to the outlet of the cooling component through a pipeline, and the cold source outlet of the reheating heat exchanger is connected to the inlet of the exhaust fan.

[0008] According to the above solution, the heat source outlet of the temperature recovery heat exchanger is connected to the mixer through a pipeline.

[0009] According to the above scheme, the cooling component includes a dehydrator, a primary demister and a secondary demister connected in sequence through air pipelines along the flow direction of hot and humid air, and the gas outlet of the secondary demister is connected to the cold source inlet of the temperature recovery heat exchanger through a pipeline.

[0010] According to the above scheme, the cooling component also includes a precooler arranged between the dehydrator and the first-level demister, and a cooler arranged between the first-level demister and the second-level demister. The dehydrator, precooler, first-level demister, cooler and second-level demister are all connected in sequence through pipelines; the dehydrator, precooler, first-level demister, cooler and second-level demister are respectively provided with condensate outlets, and each condensate outlet is respectively connected to the condensate pipeline, and the outlet of the condensate pipeline is connected to the condensate tank.

[0011] According to the above scheme, the cold source inlet of the cooler is connected to the cooling water supply pipeline, the cold source outlet of the cooler is connected to the cold source inlet of the precooler through the circulating cooling water pipeline, and the cold source outlet of the precooler is connected to the cooling water discharge pipeline.

[0012] According to the above scheme, the dehydrator is a centrifugal dehydrator.

[0013] According to the above scheme, the precooler, cooler and temperature recovery heat exchanger are all fin-tube heat exchangers.

[0014] According to the above scheme, the cooling blower and the exhaust fan are variable frequency fans; the mixer adopts a spiral stirring blade structure.

[0015] The beneficial effects of the present invention are as follows: the present invention uses a water cooling component to dehydrate and defog the white mist generated by water spraying, thereby reducing the humidity of the white mist and recovering condensed water at the same time; then the hot and humid air is heated by a temperature recovery component, and the heat source of the temperature recovery component is generated by the cooling section of the radiation tube of the silicon steel heat treatment furnace, which does not consume additional heat, has low energy consumption, and plays an energy-saving role; finally, the hot dry air used for temperature recovery is introduced into a mixer through a pipeline and mixed with the hot and humid air, so that the humidity of the hot and humid air is further reduced, thereby reducing the dew point temperature of the hot and humid air discharged from the chimney, so that the dew point temperature cannot be reached in a short time after being discharged from the chimney, and the moisture in the exhaust gas will not condense into water mist, thereby achieving the purpose of eliminating white smoke and completely eliminating the visual pollution caused by the white mist. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention.

[0017] In the figure, 1-cooling blower, 2-radiant tube cooling section of silicon steel heat treatment furnace, 3-water spray cooling section of silicon steel heat treatment furnace, 4-hot and wet air pipeline, 5-dehydrator, 6-condensate pipeline, 7-precooler, 8-first-stage demister, 9-cooler, 10-condensate tank, 11-second-stage demister, 12-reheat heat exchanger, 13-exhaust induced draft fan, 14-mixer, 15-chimney, 16-hot and dry air pipeline, 17-circulating cooling water pipeline. DETAILED DESCRIPTION

[0018] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] like Figure 1 The de-whitening and demisting system shown is specifically a de-whitening and demisting system for the water spray cooling section of a silicon steel heat treatment furnace, comprising a cooling component, a temperature return component, an exhaust induced draft fan 13, a mixer 14 and a chimney 15; The interior of the water spray cooling section 3 of the silicon steel heat treatment furnace is connected to the inlet of the hot and humid air pipeline 4, the outlet of the hot and humid air pipeline 4 is connected to the inlet of the cooling component, the condensed water outlet of the cooling component is connected to the condensed water pipeline 6, the outlet of the cooling component is connected to the cold source inlet of the temperature recovery component, the cold source outlet of the temperature recovery component is connected to the inlet of the exhaust induced draft fan 13, and the outlet of the exhaust induced draft fan 13 is connected to the inlet of the chimney 15; The outlet of the cooling section 2 of the radiation tube of the silicon steel heat treatment furnace is connected to the heat source channel of the temperature recovery component through the hot dry air pipeline 16.

[0020] In the present invention, the water spray cooling section 3 of the silicon steel heat treatment furnace generates white smoke, which is cooled and dehumidified by the cooling component and then discharged after being reheated by the reheating component; the heat source of the reheating component is provided by the radiation tube cooling section 2 of the silicon steel heat treatment furnace.

[0021] Preferably, the reheating component includes a cooling blower 1 and a reheating heat exchanger 12; the inlet of the cooling blower 1 is connected to the cold air source, the outlet of the cooling blower 1 is connected to the inside of the cooling section 2 of the radiant tube of the silicon steel heat treatment furnace, the inside of the cooling section 2 of the radiant tube of the silicon steel heat treatment furnace is connected to the inlet of the hot dry air pipeline 16, and the outlet of the hot dry air pipeline 16 is connected to the heat source channel of the reheating heat exchanger 12; the cold source channel of the reheating heat exchanger 12 is connected to the outlet of the cooling component through a pipeline, and the cold source outlet of the reheating heat exchanger 12 is connected to the inlet of the exhaust fan 13.

[0022] In the present invention, the cooling section 2 of the radiation tube of the silicon steel heat treatment furnace provides a heat source for the regenerative heat exchanger 12 to heat the hot and humid air after being dehumidified by the cooling assembly.

[0023] Preferably, the heat source outlet of the temperature recovery heat exchanger 12 is connected to the mixer 14 through a pipeline.

[0024] In the present invention, the hot dry air coming out of the temperature recovery heat exchanger 12 enters the mixer 14 and is mixed with the hot humid air, so that the humidity of the hot humid air is further reduced.

[0025] Preferably, the cooling assembly includes a dehydrator 5, a primary demister 8 and a secondary demister 11 which are connected in sequence through air pipelines along the flow direction of the hot and humid air, and the gas outlet of the secondary demister 11 is connected to the cold source inlet of the temperature recovery heat exchanger 12 through a pipeline.

[0026] Preferably, the cooling component also includes a precooler 7 arranged between the dehydrator 5 and the first-level demister 8, and a cooler 9 arranged between the first-level demister 8 and the second-level demister 11. The dehydrator 5, precooler 7, first-level demister 8, cooler 9 and second-level demister 11 are all connected in sequence through pipelines; the dehydrator 5, precooler 7, first-level demister 8, cooler 9 and second-level demister 11 are respectively provided with condensate outlets, and each condensate outlet is respectively connected to the condensate pipeline 6, and the outlet of the condensate pipeline 6 is connected to the condensate tank 10.

[0027] In the present invention, the hot and humid air in the hot and humid air pipeline 4 flows through the dehydrator 5, the precooler 7, the first-level demister 8, the cooler 9 and the second-level demister 11 in sequence for cooling and dehumidification, and then flows out of the second-level demister 11 and enters the temperature recovery heat exchanger 12 for temperature recovery and heat exchange.

[0028] Preferably, the cold source inlet of the cooler 9 is connected to the cooling water supply pipeline, the cold source outlet of the cooler 9 is connected to the cold source inlet of the precooler 7 through the circulating cooling water pipeline 17, and the cold source outlet of the precooler 7 is connected to the cooling water discharge pipeline.

[0029] In the present invention, the cooling water in the cooler 9 flows into the precooler 7 to precool the hot and humid air.

[0030] In the present invention, each device such as the dehydrator 5, the precooler 7, the primary demister 8, the cooler 9 and the secondary demister 11 are all existing mature products, wherein the dehydrator 5 is of centrifugal type; the primary demister 8 is of baffle structure, and the baffle material is PP material; The precooler 7, cooler 9 and temperature recovery heat exchanger 12 are all fin-tube heat exchangers, and the fin tubes are made of 316L stainless steel; the secondary demister 11 adopts a wire mesh structure, and the wire mesh structure is made of 316L stainless steel; the cooling blower 1 and the exhaust fan 13 are variable frequency fans; the mixer 14 adopts a spiral stirring blade structure.

[0031] The working principle of the present invention is: A large amount of hot and humid air generated in the water spray cooling section 3 of the silicon steel heat treatment furnace passes through the hot and humid air pipeline 4, passes through the cooling component, the temperature recovery heat exchanger 12, the exhaust fan 13, the mixer 14 in sequence, and is finally discharged from the chimney 15; the cooling component is provided with a dehydrator 5, a precooler 7, a primary demister 8, a cooler 9, a secondary demister 11, a condensate water tank 10, and a circulating cooling water pipeline 17 to dehydrate and demist the hot and humid air and reduce the humidity of the hot and humid air; the dehydrator 5 adopts a centrifugal type to preliminarily remove moisture; the precooler 7 and the cooler 9 use circulating cooling water to reduce the temperature of the hot and humid air, so that the water therein is further saturated, and the condensed water is further removed after passing through the primary demister 8 and the secondary demister 11, and the condensed water in each device is respectively recovered to the condensed water tank through the condensed water pipeline 6 Box 10; the first-stage demister 8 adopts a baffle structure and is made of PP; the second-stage demister 11 adopts a wire mesh structure and is made of 316L stainless steel; the rewarming component uses a cooling blower 1 to allow cold air to enter the cooling section 2 of the radiation tube of the silicon steel heat treatment furnace for heat exchange to generate hot dry air, and the hot dry air enters the rewarming heat exchanger 12 through the hot dry air pipeline 16 to heat the dehydrated hot and humid air without consuming additional heat, thereby achieving an energy-saving effect; the hot dry air coming out of the rewarming heat exchanger 12 enters the mixer 14 and mixes with the hot and humid air to further reduce the humidity of the hot and humid air, thereby reducing the dew point temperature of the hot and humid air discharged from the chimney 15, so that the dew point temperature will not be reached in a short time after it is discharged from the chimney 15, and the moisture in the exhaust gas will not condense into water mist, thereby achieving the purpose of eliminating white smoke.

[0032] The brief working process of the de-whitening and demisting system for the water spray cooling section 3 of the silicon steel heat treatment furnace of the present invention is as follows: The cooling component dehydrates and defogs the white mist generated by water spraying to reduce its humidity and recover condensed water at the same time; the hot and humid air is then heated by the temperature recovery component, and the heat source of the temperature recovery component is generated by the cooling section 2 of the radiation tube of the silicon steel heat treatment furnace, which does not consume additional heat and plays an energy-saving role; finally, the hot dry air used for temperature recovery is introduced into the mixer 14 through a pipeline and mixed with the hot and humid air to further reduce the humidity of the hot and humid air, thereby reducing the dew point temperature of the hot and humid air discharged from the chimney 15, so that the dew point temperature cannot be reached in a short time after being discharged from the chimney 15, and the moisture in the exhaust gas will not condense into water mist, thereby achieving the purpose of eliminating white smoke.

[0033] The above are only preferred embodiments of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the protection scope of the present invention.

Claims

1. A defogging system, characterized in that: Including cooling components, temperature recovery components, exhaust fans, mixers and chimneys; The interior of the water spray cooling section of the silicon steel heat treatment furnace is connected to the inlet of the hot and humid air pipeline, the outlet of the hot and humid air pipeline is connected to the inlet of the cooling component, the condensed water outlet of the cooling component is connected to the condensed water pipeline, the outlet of the cooling component is connected to the cold source inlet of the temperature recovery component, the cold source outlet of the temperature recovery component is connected to the inlet of the exhaust induced draft fan, and the outlet of the exhaust induced draft fan is connected to the chimney inlet; The outlet of the cooling section of the radiation tube of the silicon steel heat treatment furnace is communicated with the heat source channel of the temperature recovery component through a hot dry air pipeline.

2. The de-whitening and defogging system according to claim 1, characterized in that: The regeneration component includes a cooling blower and a regeneration heat exchanger; the inlet of the cooling blower is connected to the cold air source, the outlet of the cooling blower is connected to the interior of the cooling section of the radiant tube of the silicon steel heat treatment furnace, the interior of the cooling section of the radiant tube of the silicon steel heat treatment furnace is connected to the inlet of the hot dry air pipeline, and the outlet of the hot dry air pipeline is connected to the heat source channel of the regeneration heat exchanger; the cold source channel of the regeneration heat exchanger is connected to the outlet of the cooling component through a pipeline, and the cold source outlet of the regeneration heat exchanger is connected to the inlet of the exhaust fan.

3. The de-whitening and demisting system according to claim 1 or 2, characterized in that: The heat source outlet of the temperature recovery heat exchanger is communicated with the mixer through a pipeline.

4. The de-whitening and demisting system according to claim 2, characterized in that: The cooling assembly includes a dehydrator, a primary demister and a secondary demister which are connected in sequence through an air pipeline along the flow direction of the hot and humid air, and the gas outlet of the secondary demister is connected to the cold source inlet of the temperature recovery heat exchanger through a pipeline.

5. The de-whitening and demisting system according to claim 4, characterized in that: The cooling component also includes a precooler arranged between the dehydrator and the first-level demister, and a cooler arranged between the first-level demister and the second-level demister. The dehydrator, precooler, first-level demister, cooler and second-level demister are all connected in sequence through pipelines; the dehydrator, precooler, first-level demister, cooler and second-level demister are respectively provided with condensate outlets, and each condensate outlet is respectively connected to a condensate pipeline, and the outlet of the condensate pipeline is connected to a condensate tank.

6. The de-whitening and defogging system according to claim 1, characterized in that: The cold source inlet of the cooler is connected to the cooling water supply pipeline, the cold source outlet of the cooler is connected to the cold source inlet of the precooler through the circulating cooling water pipeline, and the cold source outlet of the precooler is connected to the cooling water discharge pipeline.

7. The de-whitening and defogging system according to claim 4, characterized in that: The dehydrator is a centrifugal dehydrator.

8. The de-whitening and demisting system according to claim 5, characterized in that: The precooler, cooler and reheat exchanger are all fin-tube heat exchangers.

9. The de-whitening and defogging system according to claim 5, characterized in that: The cooling blower and exhaust fan are variable frequency fans; the mixer adopts a spiral stirring blade structure.

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