Return hot air cooling device of belt type roasting machine and belt type roasting machine
Through the belt roaster hot air cooling device and steam circulation mechanism, the problems of excessive flue gas temperature and high oxygen content are solved, the flue gas cooling and self-heating of downstream equipment are realized, and the energy utilization efficiency is improved.
Patent Information
- Application Number
- CN202510602123.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-12
- Publication Date
- 2025-07-11
AI Technical Summary
The flue gas temperature is too high before the belt roaster returns to the heater, and a large amount of cold air needs to be filled, resulting in large amounts of flue gas and high oxygen content, and downstream equipment needs external heat source to provide heating.
The belt roaster is heated and cooled by heating air of the belt roaster. The flue gas is cooled through the waste heat boiler and the steam is sent to the downstream equipment by using the steam circulation mechanism to reduce the flue gas temperature and oxygen content. At the same time, the heat source of the belt roaster bellows is used to heat the downstream equipment.
The flue gas temperature and oxygen content are reduced, the need for additional heat sources is avoided, and the energy utilization efficiency is improved.
Smart Images
Figure CN120292904A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of traveling grate machines, and particularly to a hot return air cooling device for a traveling grate machine and a traveling grate machine. Background Art
[0002] At present, the temperature of the flue gas before the hot return air fan of the traveling grate machine is much higher than the temperature required for suction drying, and a large amount of cold air needs to be mixed in, resulting in a large amount of main induced draft flue gas and high oxygen content. The hopper for semi-dry desulfurization needs to be continuously heated by steam to prevent the desulfurized ash from caking; the pellet plants in the north need heat sources for heating in winter, and the raw material bins, the main induced draft ESP, and the hoppers of the drum drying deduster need to be heated to prevent caking; these heat sources need to be supplied externally. Summary of the Invention
[0003] The present disclosure aims to solve at least one of the technical problems existing in the prior art or related technologies.
[0004] To this end, in the first aspect of the present disclosure, a hot return air cooling device for a traveling grate machine is provided, which includes a traveling grate machine air box, a waste heat boiler, a hot return air fan, an upper hood of the traveling grate machine, and a flow regulating pipeline. The waste heat boiler is respectively connected to the traveling grate machine air box through a first pipeline, connected to the hot return air fan through a second pipeline, and connected to downstream heat supply equipment to be heated through a steam circulation mechanism; the hot return air fan is connected to the upper hood of the traveling grate machine through a third pipeline. A first valve is provided on the first pipeline, and a cold air mixing valve is provided on the second pipeline. Wherein, the flow regulating pipeline has an inlet end and an outlet end. The inlet end is communicated with the first pipeline between the traveling grate machine air box and the first valve, and the outlet end is communicated with the second pipeline between the waste heat boiler and the cold air mixing valve, and a second valve is provided on the flow regulating pipeline.
[0005] In a feasible implementation manner, the steam circulation mechanism includes a steam circulation pipeline and a steam water circulation component. The steam circulation pipeline includes a main pipeline and a plurality of branch pipelines. The main pipeline is connected to the waste heat boiler, one ends of the plurality of branch pipelines are communicated with the main pipeline, and the opposite ends are connected to the plurality of downstream heat supply equipment to be heated. The steam water circulation component is connected between the downstream heat supply equipment to be heated and the waste heat boiler, and the steam water circulation component is used to input the condensed water after heat exchange of the downstream heat supply equipment to the waste heat boiler.
[0006] In a feasible implementation manner, the steam water circulation component includes a first water tank, a steam trap group, and a first water pump. The steam trap group has an inlet side and an outlet side. The inlet side is connected to the downstream heat supply equipment to be heated, and the outlet side is connected to the first water tank. The first water pump is used to provide the force for inputting the condensed water in the first water tank into the waste heat boiler.
[0007] In a feasible implementation manner, it further includes a makeup water assembly for the waste heat boiler. The makeup water assembly for the waste heat boiler includes a second water tank and a second water pump. The second water tank has a water inlet port and a water outlet port. The water inlet port is connected to a makeup water pipeline, and the water outlet port is connected to the waste heat boiler through a water outlet pipeline. The second water pump is arranged on the water outlet pipeline.
[0008] In a feasible implementation manner, a makeup water valve is arranged on the water inlet pipeline.
[0009] In a feasible implementation manner, at least one silo is included in the multiple downstream heat supply devices to be heated.
[0010] In a feasible implementation manner, at least one dust collector ash hopper is included in the multiple downstream heat supply devices to be heated.
[0011] In a feasible implementation manner, at least one heat exchange station is included in the multiple downstream heat supply devices to be heated.
[0012] In a feasible implementation manner, it further includes a third valve. The third valve is arranged on the second pipeline and is arranged between the waste heat boiler and the outlet end.
[0013] In a second aspect of the present disclosure, a belt roasting furnace is provided, which includes the above-mentioned belt roasting machine regenerative air blower cooling device.
[0014] Compared with the prior art, the present disclosure has at least the following beneficial effects: The regenerative air blower of the present disclosure extracts the flue gas from the air box of the belt roasting machine. A part of the flue gas passes through the first valve and is cooled to the inlet of the regenerative air blower by the waste heat boiler, and another part of the flue gas reaches the inlet of the regenerative air blower through the second valve. When the temperature of the mixture of the two flue gases exceeds the temperature required for the upper hood of the belt roasting machine, a certain amount of air is introduced through the cold air mixing valve, so as to reduce the temperature entering the upper hood of the belt roasting machine. Since the amount of cold air introduced by the cold air mixing valve is reduced, its oxygen content is also reduced, thus avoiding a large amount of main induced draft flue gas and high oxygen content. The flue gas in the air box of the belt roasting machine provides heat source for the waste heat boiler, and the steam generated by the waste heat boiler is sent to downstream heat supply devices such as silos, dust collector ash hoppers, and heat exchange stations through a steam circulation mechanism, which not only ensures the cooling of the regenerative air of the belt roasting machine, but also utilizes the heat source in the air box of the belt roasting machine to supply heat to downstream heat supply devices, so that the downstream heat supply devices no longer need additional heat source supply. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The drawings here are incorporated into the description and form a part of this description, showing embodiments consistent with the present disclosure and used together with the description to explain the principles of the present disclosure.
[0016] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0017] By reading the detailed description of the exemplary embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the exemplary embodiments and are not considered a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:
[0018] Figure 1 It is a schematic diagram of the connection structure of the present disclosure.
[0019] Among them, Figure 1 The corresponding relationship between the reference numerals in the drawings and the component names is as follows:
[0020] 100 - First valve; 200 - Cold air mixing valve; 300 - Second valve; 400 - Third valve;
[0021] 1 - Belt grate cooler air box; 2 - Waste heat boiler; 21 - First pipeline; 22 - Second pipeline; 3 - Regenerative air blower; 31 - Third pipeline; 4 - Belt grate cooler upper hood; 5 - Flow regulation pipeline; 51 - Inlet end; 52 - Outlet end; 6 - Downstream heat supply equipment to be supplied; 71 - Main pipeline; 72 - Branch pipeline; 81 - First water tank; 82 - Drain valve group; 83 - First water pump; 91 - Second water tank; 92 - Second water pump; 93 - Make-up water pipeline; 94 - Outlet water pipeline; 95 - Make-up water valve. Detailed implementation manners
[0022] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present disclosure, the following will further describe the solutions of the present disclosure. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.
[0023] In the following description, many specific details are set forth to fully understand the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.
[0024] At present, the flue gas temperature before the reheating fan of the traveling grate is much higher than the temperature required for suction drying, and a large amount of cold air needs to be mixed in, resulting in a large volume of main induced draft flue gas and a high oxygen content. The hoppers for semi-dry desulfurization need to be continuously heated by steam to prevent the desulfurized ash from caking; the pellet plants in the north need heat sources for heating in winter, and the raw material bins, the dust collectors of the main induced draft fans, and the hoppers of the drum drying dust collectors need to be heated to prevent caking; these heat sources need to be externally supplied.
[0025] Based on this, the embodiments of the present disclosure provide a device for cooling the reheated hot air of a traveling grate. The reheating fan 3 extracts the flue gas at about 400 - 550 °C from the wind box 1 of the traveling grate. A part of the flue gas passes through the waste heat boiler 2 after the first valve 100 and is cooled to the inlet of the reheating fan 3, and another part of the flue gas passes through the second valve 300 to the inlet of the reheating fan 3. When the temperature of the mixture of the two flue gases exceeds the temperature required for the upper hood 4 of the traveling grate, a certain amount of air is introduced through the cold air mixing valve 200, so as to reduce the temperature entering the upper hood 4 of the traveling grate. Since the amount of cold air introduced by the cold air mixing valve 200 is reduced, its oxygen content is also reduced, thus avoiding a large volume of main induced draft flue gas and a high oxygen content. The flue gas from the wind box 1 of the traveling grate provides heat for the waste heat boiler 2, and the steam generated by the waste heat boiler 2 is sent to the downstream heat supply equipment 6 such as the material bin, the dust collector hopper, and the heat exchange station through the steam circulation mechanism, which not only ensures the cooling of the reheated hot air of the traveling grate, but also utilizes the heat source of the wind box 1 of the traveling grate to supply heat to the downstream heat supply equipment 6, so that the downstream heat supply equipment 6 no longer needs additional heat source supply.
[0026] The following is a detailed description of the device for cooling the reheated hot air of the traveling grate through specific embodiments:
[0027] Refer to Figure 1 As shown, in the first aspect of the present disclosure, a device for cooling the reheated hot air of a traveling grate is provided, including a wind box 1 of the traveling grate, a waste heat boiler 2, a reheating fan 3, an upper hood 4 of the traveling grate, and a flow regulation pipeline 5. The waste heat boiler 2 is respectively connected to the wind box 1 of the traveling grate through a first pipeline 21, connected to the reheating fan 3 through a second pipeline 22, and connected to the downstream heat supply equipment 6 through a steam circulation mechanism; the reheating fan 3 is connected to the upper hood 4 of the traveling grate through a third pipeline 31. A first valve 100 is arranged on the first pipeline 21, and a cold air mixing valve 200 is arranged on the second pipeline 22. Among them, the flow regulation pipeline 5 has an inlet end 51 and an outlet end 52. The inlet end 51 is communicated with the first pipeline between the wind box 1 of the traveling grate and the first valve 100, the outlet end 52 is communicated with the second pipeline between the waste heat boiler and the cold air mixing valve 200, and a second valve 300 is arranged on the flow regulation pipeline 5.
[0028] The regenerative air blower 3 of the present disclosure extracts the flue gas of the belt grate cooler air box 1 at about 400 - 550 °C. A part of the flue gas passes through the first valve 100 and then is cooled to the inlet of the regenerative air blower 3 by the waste heat boiler 2. Another part of the flue gas passes through the second valve 300 to the inlet of the regenerative air blower 3. When the temperature of the mixture of the two flue gases exceeds the required temperature of the upper cover 4 of the belt grate cooler, a certain amount of air is introduced through the cold air mixing valve 200, thereby reducing the temperature entering the upper cover 4 of the belt grate cooler. Since the amount of cold air introduced by the cold air mixing valve 200 decreases, its oxygen content also decreases, thus avoiding a large amount of main induced draft flue gas with a high oxygen content. The flue gas of the belt grate cooler air box 1 provides heat source for the waste heat boiler 2. The steam generated by the waste heat boiler 2 is sent to the downstream heat supply equipment 6 such as the silo, the dust collector ash hopper, and the heat exchange station through the steam circulation mechanism. That is, it ensures the cooling of the regenerative hot air of the belt grate cooler, and at the same time utilizes the heat source of the belt grate cooler air box 1 to supply heat to the downstream heat supply equipment 6, so that the downstream heat supply equipment 6 no longer requires additional heat source supply.
[0029] Specifically, the first valve 100 and the second valve 300 of the present disclosure adjust the flow rate of the flue gas input from the belt grate cooler air box 1 passing through the first pipeline 21 and the flow rate adjustment pipeline 5 by adjusting their opening degrees. The first valve 100 and the second valve 300 can be selected as regulating valves or throttle valves. In the present disclosure, regulating valves are specifically selected. It should be noted that the first valve 100 and the second valve 300 of the present disclosure are respectively arranged on two pipelines, and the two form a multi-stage adjustment mode. For example, when the first valve 100 is fully open, the flue gas inlet volume of the waste heat boiler 2 is adjusted by adjusting the opening degree of the second valve 300. That is, the larger the opening degree of the second valve 300, the larger the amount of flue gas output from the belt grate cooler air box 1 flowing into the flow rate adjustment pipeline 5, then the amount of flue gas in the first pipeline 21 will decrease, and the flue gas entering the waste heat boiler 2 will also decrease accordingly. Adjusting the opening degree of the first valve 100 with the second valve 300 fully open has the same adjustment principle and will not be elaborated here. When both the first valve 100 and the second valve 300 adjust their opening degrees, precise adjustment of the flue gas flow rate can be achieved, making it easier to achieve the target temperature of flue gas cooling. Compared with single valve adjustment or a large amount of cold air adjustment for temperature, the present disclosure has stronger control over temperature adjustment.
[0030] In some embodiments, the steam circulation mechanism includes a steam circulation pipeline and a steam water circulation component. The steam circulation pipeline includes a main pipeline 71 and a plurality of branch pipelines 72. The main pipeline 71 is connected to the waste heat boiler 2. One ends of the plurality of branch pipelines 72 communicate with the main pipeline 71, and the opposite ends are connected to a plurality of downstream heat supply equipment 6. The steam water circulation component is connected between the downstream heat supply equipment 6 and the waste heat boiler 2, and the steam water circulation component is used to input the condensed water after heat exchange of the downstream heat supply equipment 6 into the waste heat boiler 2.
[0031] In this embodiment, the steam circulation mechanism can introduce the condensed water circulation generated by the downstream heat supply device 6 to be heated into the waste heat boiler 2, and can realize the self-circulation of the water supply of the waste heat boiler 2. The steam circulation pipeline includes a main pipeline 71 and a plurality of branch pipelines 72. One end of the main pipeline 71 is connected to the water inlet area of the waste heat boiler 2, and the plurality of branch pipelines 72 are connected to the main pipeline 71. The branch pipelines 72 are directly connected to the main pipeline, or can be connected to the main pipeline 71 through a water distribution row. In this disclosure, a water distribution row is specifically selected. Further, cut-off valves are respectively arranged on the plurality of branch pipelines 71 for the maintenance and repair of the branch pipelines 72 and the downstream heat supply device 6 to be heated. The steam water circulation assembly can be a water pump, a pneumatic pump, an electric pump, a hydraulic pump, etc.
[0032] In some embodiments, the steam water circulation assembly includes a first water tank 81, a steam trap group 82, and a first water pump 83. The steam trap group 82 has an inlet side and an outlet side. The inlet side is connected to the downstream heat supply device 6 to be heated, and the outlet side is connected to the first water tank 81. The first water pump 83 is used to provide the force for inputting the condensed water in the first water tank 81 into the waste heat boiler 2.
[0033] In this embodiment, the inlet side of the steam trap group 82 is connected to the downstream heat supply device 6 to be heated to introduce the condensed water into the first water tank 81, and the water in the first water tank 81 is input into the waste heat boiler 2 through the first water pump 83. Specifically, according to the water consumption of the waste heat boiler 2, the steam trap group 82 can open or block the discharge of the condensed water of the downstream heat supply device 6 to be heated. It should be noted that the first water tank 81, the steam trap group 82, and the first water pump 83 of this disclosure are all connected by pipelines, and the first water pump 83 is also connected to the waste heat boiler 2 by pipelines. In the embodiment where there are multiple downstream heat supply devices 6 to be heated, there are multiple sets of steam water circulation assemblies corresponding thereto, and the multiple first water pumps 83 can be respectively connected to the waste heat boiler 2, or can be aggregated through a water distribution row to the main pipeline and connected to the waste heat boiler.
[0034] In some embodiments, a waste heat boiler water replenishment assembly is further included. The waste heat boiler water replenishment assembly includes a second water tank 91 and a second water pump 92. The second water tank 91 has a water inlet port and a water outlet port. The water inlet port is connected to a water replenishment pipeline 93, and the water outlet port is connected to the waste heat boiler 2 through a water outlet pipeline 94. The second water pump 92 is arranged on the water outlet pipeline.
[0035] In this embodiment, the waste heat boiler water replenishment assembly is a direct water replenishment device for the waste heat boiler 2. The second water tank 91 can be used as a collection part for the condensed water output by the steam water circulation assembly, that is, the condensed water of the multiple downstream heat supply devices 6 output by the steam water circulation assembly is all collected in the second water tank 91, and the waste heat boiler 2 is replenished with water through the second water pump 92. Further, a water replenishment valve 95 is arranged on the water inlet pipeline 94 to control the water inlet flow rate of the second water tank 91.
[0036] In some embodiments, a third valve 400 is further included. The third valve 400 is disposed on the second pipeline 22 and between the waste heat boiler 2 and the outlet end 52. In this embodiment, the third valve 400 cooperates with the first valve 100 for use when the waste heat boiler 2 is under maintenance or out of use.
[0037] In a second aspect of the present disclosure, a belt roasting furnace is provided, including the belt roasting machine return hot air cooling device provided in the first aspect of the present disclosure.
[0038] In the present disclosure, the terms "first", "second", and "third" are used only for the purpose of description and cannot be construed as indicating or implying relative importance; the term "plurality" means two or more unless otherwise clearly defined. Terms such as "installed", "connected", "connected to", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.
[0039] In the description of the present disclosure, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present disclosure.
[0040] In the description of this specification, the descriptions of the terms "an embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.
[0041] The above are only the preferred embodiments of the present disclosure and are not used to limit the present disclosure. For those skilled in the art, the present disclosure can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.
Claims
1. A hot air return cooling device for a traveling grate machine, characterized in that, It includes a wind box of a traveling grate stoker, a waste heat boiler, a regenerative air blower, an upper cover of the traveling grate stoker, and a flow regulating pipeline. The waste heat boiler is connected to the wind box of the traveling grate stoker through a first pipeline, the waste heat boiler is connected to the regenerative air blower through a second pipeline, and the waste heat boiler is connected to a downstream heat supply device to be heated through a steam circulation mechanism; the regenerative air blower is connected to the upper cover of the traveling grate stoker through a third pipeline. A first valve is arranged on the first pipeline, and a cold air mixing valve is arranged on the second pipeline. Among them, the flow regulating pipeline has an inlet end and an outlet end. The inlet end is communicated with the first pipeline between the wind box of the traveling grate stoker and the first valve, and the outlet end is communicated with the second pipeline between the waste heat boiler and the cold air mixing valve. And a second valve is arranged on the flow regulating pipeline.
2. The hot air return cooling device for the traveling grate machine according to claim 1, wherein The steam circulation mechanism includes a steam circulation pipeline and a steam-water circulation component. The steam circulation pipeline includes a main pipeline and a plurality of branch pipelines. The main pipeline is connected to the waste heat boiler. One ends of the plurality of branch pipelines are communicated with the main pipeline, and the opposite ends are connected to a plurality of the downstream heat supply devices to be heated. The steam-water circulation component is connected between the downstream heat supply devices to be heated and the waste heat boiler, and the steam-water circulation component is used for inputting the condensed water after heat exchange by the downstream heat supply devices to the waste heat boiler.
3. The hot air return cooling device for a traveling grate machine according to claim 2, characterized in that, The steam-water circulation component includes a first water tank, a steam trap group, and a first water pump. The steam trap group has an inlet side and an outlet side. The inlet side is connected to the downstream heat supply devices to be heated, and the outlet side is connected to the first water tank. The first water pump is used for providing the force for inputting the condensed water in the first water tank into the waste heat boiler.
4. The hot air return cooling device for a traveling grate machine according to claim 1, characterized in that, It further includes a waste heat boiler water replenishing component. The waste heat boiler water replenishing component includes a second water tank and a second water pump. The second water tank has a water inlet port and a water outlet port. The water inlet port is connected to a water replenishing pipeline, and the water outlet port is connected to the waste heat boiler through a water outlet pipeline. The second water pump is arranged on the water outlet pipeline.
5. The belt roasting machine return hot air cooling device according to claim 4, characterized in that A water replenishing valve is arranged on the water inlet pipeline.
6. The hot air return cooling device for a traveling grate machine according to claim 2, wherein, The plurality of downstream heat supply devices to be heated include at least one silo.
7. The hot air return cooling device for a traveling grate machine according to claim 2, characterized in that The plurality of downstream heat supply devices to be heated include at least one dust collector ash hopper.
8. The hot air return cooling device for a traveling grate machine according to claim 2, characterized in that, The plurality of downstream heat supply devices to be heated include at least one heat exchange station.
9. The hot air return cooling device for a traveling grate machine according to any one of claims 1 to 8, characterized in that It further includes a third valve. The third valve is arranged on the second pipeline, and the third valve is arranged between the waste heat boiler and the outlet end.
10. A traveling grate machine, characterized in that, It includes the traveling grate stoker regenerative air cooling device according to any one of claims 1 to 9 above.