Waste heat recovery system of circular cooler

Abstract

The invention relates to the technical field of circular cooler waste heat recovery, in particular to a circular cooler waste heat recovery system which comprises a bottom plate, a circular cooler body, a smoke hood, a dustproof assembly, a filtering assembly and a heat exchange assembly, the dustproof assembly is communicated with the smoke hood, the filtering assembly comprises a treatment tower, a slaked lime powder bin, an ejector, a water tank and a water spraying pump, and the treatment tower is communicated with the dustproof assembly. The hydrated lime powder bin is connected with the ejector, the ejector is communicated with the interior of the treatment tower, the water tank is connected with the water injection pump, the water injection pump is communicated with the interior of the treatment tower, and the heat exchange assembly is communicated with the treatment tower. Flue gas flows to the dustproof assembly through the smoke hood, dust is isolated at the dustproof assembly, then the flue gas enters the treatment tower, the ejector sprays slaked lime powder into the treatment tower, the water spraying pump sprays a water source into the treatment tower, sulfur dioxide in the flue gas is removed through chemical reaction, equipment corrosion is avoided, and the service life of the equipment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery of annular coolers, and in particular to a waste heat recovery system of annular coolers. Background Art

[0002] Annular coolers are mainly used to cool high-temperature sintered ore or pelletized ore. The existing waste heat recovery of annular coolers adopts the waste heat boiler method, and the flue gas generated in the waste heat boiler cannot be recovered, wasting resources.

[0003] The existing announcement number CN214276536U discloses a waste heat recovery device for a ring cooler, including a base plate, on which a waste heat recovery structure is arranged; the waste heat recovery structure includes: a ring cooler body, two smoke hoods, two first conveying pipes, a second conveying pipe, an extraction filter component, a heat exchange component, a first return air pipe and a second return air pipe. The hot air generated in the ring cooler is first filtered and recovered, and after the flue gas is heat exchanged by the heat exchange component, the low-temperature hot air is discharged into the ring cooler again through the first return air pipe, and the flue gas generated by the boiler itself is conveyed to the ring cooler through the second return air pipe. The flue gas generated by the boiler is recycled, which can generate considerable economic benefits, and because the exhaust gas realizes a closed cycle, the environmental pollution problem caused by the emission of particulate matter in the exhaust gas is effectively avoided.

[0004] However, when the above-mentioned ring cooler waste heat recovery device is applied to the sintering process, the exhaust gas may contain corrosive components. These corrosive components mainly come from the fuel and raw materials used in the sintering process, as well as the chemical reactions produced by the sintering process itself. The above-mentioned ring cooler waste heat recovery device does not process the corrosive components. Long-term operation may cause corrosion to equipment such as pipelines and heat exchangers, shortening the service life of the equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a waste heat recovery system for a ring cooler, which solves the problem that when the existing waste heat recovery device for a ring cooler is used in a sintering process, the waste gas may contain corrosive components, and long-term operation may cause corrosion to equipment such as pipelines and heat exchangers, thereby shortening the service life of the equipment.

[0006] To achieve the above-mentioned object, the present invention provides a waste heat recovery system for an annular cooler, comprising a base plate, an annular cooler body and a smoke hood, wherein the annular cooler body is located on the top of the base plate, the smoke hood is connected to the annular cooler body and is located on the top of the annular cooler body, and further comprises a dustproof component, a filter component and a heat exchange component;

[0007] The dust-proof component is connected to the smoke hood, and the filtering component includes a treatment tower, a slaked lime powder bin, an ejector, a water tank and a water spray pump. The treatment tower is connected to the dust-proof component, the slaked lime powder bin is connected to the ejector, the ejector is connected to the interior of the treatment tower, the water tank is connected to the water spray pump, the water spray pump is connected to the interior of the treatment tower, and the heat exchange component is connected to the treatment tower.

[0008] Wherein, the filtering component also includes a denitration oxidant preparation tank and a lifting pump, and the denitration oxidant preparation tank is connected to the lifting pump.

[0009] Wherein, the filtering component also includes an atomizer and a denitrification oxidant tank, the denitrification oxidant tank is connected to the lifting pump, the atomizer is communicated with the denitrification oxidant tank, and is located inside the treatment tower.

[0010] Among them, the heat exchange component includes a gas pipe, a boiler and a combustion chamber. The boiler is located on one side of the treatment tower, and the combustion chamber is located inside the boiler. One end of the gas pipe is connected to the treatment tower, and the other end extends into the interior of the boiler and spirals along the height direction of the combustion chamber.

[0011] Wherein, the heat exchange component also includes a circulation fan and a first return air pipe, the circulation fan is connected to the air supply pipe, one end of the first return air pipe is connected to the circulation fan, and the other end is connected to the ring cooler body.

[0012] Wherein, the heat exchange component also includes a second return air pipe, one end of which is connected to the combustion chamber, and the other end of which is connected to the ring cooler body.

[0013] A waste heat recovery system for a ring cooler of the present invention, when it is necessary to recover and transport the heat generated by the ring cooler body, the heat exchange component is started, the flue gas flows to the dustproof component through the smoke hood, dust is isolated at the dustproof component, and then enters the treatment tower, the injector sprays slaked lime powder into the treatment tower, the water pump sprays water into the treatment tower, wherein the slaked lime powder is stored in the slaked lime powder bin, the water source is stored in the water tank, and chemical reactions are used to remove sulfur dioxide in the flue gas, thereby avoiding equipment corrosion and ensuring the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0015] Figure 1 It is a schematic diagram of the overall structure of the ring cooler waste heat recovery system of the present invention.

[0016] Figure 2 It is a cross-sectional view of the waste heat recovery system of the annular cooler of the present invention.

[0017] Figure 3 It is a cross-sectional view of the dustproof component of the present invention.

[0018] Figure 4 It is a schematic diagram of the filter assembly of the present invention.

[0019] In the figure: 101-bottom plate, 102-annular cooler body, 103-smoke hood, 104-treatment tower, 105-slaked lime powder silo, 106-ejector, 107-water tank, 108-water spray pump, 109-denitrification oxidant preparation tank, 110-lifting pump, 111-atomizer, 112-denitrification oxidant tank, 201-reducing pipe, 202-vertical pipe, 203-semicircular pipe partition, 301-gas pipeline, 302-boiler, 303-combustion chamber, 304-circulating fan, 305-first return air pipe, 306-second return air pipe. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but should not be construed as limiting the present invention.

[0021] The first embodiment of the present application is:

[0022] See also Figure 1 and Figure 4 ,in, Figure 1 It is a schematic diagram of the overall structure of the ring cooler waste heat recovery system of the present invention. Figure 4 It is a schematic diagram of the filter assembly of the present invention.

[0023] The present invention provides a waste heat recovery system for a ring cooler: comprising a base plate 101, a ring cooler body 102, a smoke hood 103, a dustproof component, a filter component and a heat exchange component, wherein the filter component comprises a treatment tower 104, a slaked lime powder bin 105, an ejector 106, a water tank 107, a water spray pump 108, a denitrification oxidant preparation tank 109, a lifting pump 110, an atomizer 111 and a denitrification oxidant tank 112. The above scheme solves the problem that when the existing waste heat recovery device for the ring cooler is applied to the sintering process, the waste gas may contain corrosive components, and long-term operation may cause corrosion to equipment such as pipelines and heat exchangers, thereby shortening the service life of the equipment. It can be understood that the above scheme can also be used to solve the problem of flue gas dust removal.

[0024] According to this specific embodiment, the annular cooler body 102 is located at the top of the base plate 101, the smoke hood 103 is connected to the annular cooler body 102 and is located at the top of the annular cooler body 102, the dustproof component is connected to the smoke hood 103, the treatment tower 104 is connected to the dustproof component, the slaked lime powder bin 105 is connected to the ejector 106, the ejector 106 is connected to the interior of the treatment tower 104, the water tank 107 is connected to the water spray pump 108, the water spray pump 108 is connected to the interior of the treatment tower 104, and the heat exchange component is connected to the treatment tower 104. When it is necessary to recover the heat generated by the annular cooler body 102, the heat exchange component is started to allow the flue gas to enter the dustproof component through the smoke hood 103 for dust reduction, and then enter the treatment tower 104. At this time, the injector 106 injects the slaked lime powder stored in the slaked lime powder bin 105 into the treatment tower 104, and the water pump 108 injects the water source stored in the water tank 107 into the treatment tower 104, so as to remove sulfur dioxide in the flue gas by chemical reaction.

[0025] The denitration oxidant preparation tank 109 is connected to the lift pump 110. The denitration oxidant tank 109 is connected to the lift pump 110, and the atomizer 111 is connected to the denitration oxidant tank 112 and is located inside the treatment tower 104. The denitration oxidant preparation tank 109 prepares hydrogen peroxide and water into a hydrogen peroxide denitration oxidant of suitable concentration according to a ratio, and pumps it into the denitration oxidant tank 112 through the lift pump 110, and then quantitatively supplies the denitration oxidant to the atomizer 111 through a metering device, wherein the denitration oxidant is a hydrogen peroxide solution with a concentration of 2% to 4%. The atomizer 111 sprays the denitration oxidant in the treatment tower 104 to remove nitrogen oxides by chemical reaction.

[0026] When a waste heat recovery system for a ring cooler of the present embodiment needs to recycle the heat generated by the ring cooler body 102, the heat exchange component draws out the flue gas, the flue gas passes through the dust prevention component to reduce dust, and then enters the treatment tower 104, through the injection of slaked lime powder, water source, and denitrification oxidant, a chemical reaction is carried out to remove sulfur dioxide and nitrogen oxides, and then enters the heat exchange component for heat exchange, thereby reducing the flow of corrosive components, avoiding equipment corrosion, and ensuring the service life of the equipment.

[0027] The second embodiment of the present application is:

[0028] Based on the first embodiment, please refer to Figure 1 and Figure 3 ,in, Figure 1 It is a schematic diagram of the overall structure of the ring cooler waste heat recovery system of the present invention. Figure 3It is a cross-sectional view of the dustproof component of the present invention.

[0029] The dustproof assembly of this embodiment includes a reducer 201 , a vertical pipe 202 and a semicircular pipe partition 203 .

[0030] According to this specific embodiment, the small diameter end of the reducer 201 is connected to the smoke hood 103 and is located at the top of the smoke hood 103, and the large diameter end of the reducer 201 is connected to the standpipe 202. During the rising process of the flue gas, it passes through the reducer 201. Due to the shape of the reducer 201, which is small at the bottom and large at the top, the flue gas velocity decreases, and the dust-containing flow velocity in the flue gas is buffered at a certain speed.

[0031] There are multiple semicircular duct baffles 203, and the multiple semicircular duct baffles 203 are staggered and tilted inside the vertical pipe 202. The multiple semicircular duct baffles 203 are staggered and tilted, and the spacing distance between each semicircular duct baffle 203 is ≥1m, and the inclination angle with the vertical pipe 202 is 80° to 85°, so as to facilitate the settling of dust in the flue gas.

[0032] When using a waste heat recovery system for a ring cooler of the present embodiment, the flue gas enters the reducer 201, the flue gas velocity decreases, and the dust flow rate in the flue gas is buffered at a certain speed. Then, the flue gas is blocked by the semicircular pipe baffle 203 in the riser 202. Due to the effect of gravity, part of the smoke contained in the flue gas drops to the lower ring cooler body 102 and no longer enters the treatment tower 104 with the flue gas, thereby reducing the dust content of the entire system and achieving the purpose of simple self-dust removal.

[0033] The third embodiment of the present application is:

[0034] Based on the second embodiment, please refer to Figure 1 and Figure 2 ,in, Figure 1 It is a schematic diagram of the overall structure of the ring cooler waste heat recovery system of the present invention. Figure 2 It is a cross-sectional view of the waste heat recovery system of the annular cooler of the present invention.

[0035] The heat exchange assembly of this embodiment includes an air delivery pipe 301 , a boiler 302 , a combustion chamber 303 , a circulating fan 304 , a first air return pipe 305 , and a second air return pipe 306 .

[0036] According to this specific embodiment, the boiler 302 is located on one side of the treatment tower 104, the combustion chamber 303 is located inside the boiler 302, one end of the gas pipe 301 is connected to the treatment tower 104, and the other end extends into the boiler 302 and spirals along the height direction of the combustion chamber 303. The gas pipe 301 transports the treated flue gas to enter the boiler 302, and flows in a spiral shape along the height direction of the combustion chamber 303, extending the time of passing through the boiler 302.

[0037] The circulating fan 304 is connected to the gas supply pipe 301, one end of the first air return pipe 305 is connected to the circulating fan 304, and the other end is connected to the ring cooler body 102. The circulating fan 304 is connected to the gas supply pipe 301 to provide power for the flow of flue gas, and the first air return pipe 305 re-introduces the flue gas passing through the boiler 302 into the ring cooler body 102 for reuse.

[0038] Secondly, one end of the second air return pipe 306 is connected to the combustion chamber 303, and the other end is connected to the annular cooler body 102. The flue gas generated by the combustion chamber 303 itself is transported to the annular cooler body 102 through the second air return pipe 306, so as to achieve the purpose of recycling the heat generated by the annular cooler body 102.

[0039] When a waste heat recovery system for a ring cooler is used according to the present embodiment, when it is necessary to exchange heat generated by the ring cooler body 102, the staff first injects water into the boiler 302, and the flue gas treated by the dust removal component and the filter component enters the air pipe 301, and heat is exchanged with the water in the boiler 302 through the air pipe 301, and the low-temperature hot air in the air pipe 301 returns to the ring cooler body 102 through the first return air pipe 305, and the water in the boiler 302 can also be heated through the combustion chamber 303, and the flue gas generated by the combustion chamber 303 returns to the ring cooler body 102 through the second return air pipe 306, thereby achieving the purpose of waste heat recovery.

[0040] What is disclosed above is only one or more preferred embodiments of the present application, and cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of implementing the above embodiments and equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A waste heat recovery system for an annular cooler, comprising a bottom plate, an annular cooler body and a smoke hood, wherein the annular cooler body is located on the top of the bottom plate, and the smoke hood is connected to the annular cooler body and is located on the top of the annular cooler body, characterized in that: It also includes dust prevention components, filter components and heat exchange components; The dust-proof component is connected to the smoke hood, and the filtering component includes a treatment tower, a slaked lime powder bin, an ejector, a water tank and a water spray pump. The treatment tower is connected to the dust-proof component, the slaked lime powder bin is connected to the ejector, the ejector is connected to the interior of the treatment tower, the water tank is connected to the water spray pump, the water spray pump is connected to the interior of the treatment tower, and the heat exchange component is connected to the treatment tower.

2. The waste heat recovery system for annular cooler according to claim 1, characterized in that: The filter assembly also includes a denitration oxidant preparation tank and a lift pump, and the denitration oxidant preparation tank is connected to the lift pump.

3. The waste heat recovery system for annular cooler according to claim 2, characterized in that: The filtering assembly further comprises an atomizer and a denitration oxidant tank, wherein the denitration oxidant tank is connected to the lifting pump, and the atomizer is communicated with the denitration oxidant tank and is located inside the treatment tower.

4. The waste heat recovery system for annular cooler according to claim 1, characterized in that: The heat exchange component includes a gas pipe, a boiler and a combustion chamber. The boiler is located on one side of the treatment tower, and the combustion chamber is located inside the boiler. One end of the gas pipe is connected to the treatment tower, and the other end extends into the boiler and spirals along the height direction of the combustion chamber.

5. The waste heat recovery system for annular cooler according to claim 4, characterized in that: The heat exchange component also includes a circulation fan and a first return air pipe. The circulation fan is connected to the air supply pipe. One end of the first return air pipe is connected to the circulation fan, and the other end is connected to the ring cooler body.

6. The waste heat recovery system for annular cooler according to claim 5, characterized in that: The heat exchange assembly further includes a second air return pipe, one end of which is connected to the combustion chamber, and the other end of which is connected to the annular cooler body.

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