A high-temperature purification and waste heat recovery system for spray drying exhaust gas

Abstract

This invention provides a high-temperature purification and waste heat recovery system for spray drying exhaust gas, comprising a spray drying tower, a cyclone dust collector, a regulating valve, a primary induced draft fan, a high-temperature medium dust collector, a heat exchanger, a blower, a secondary induced draft fan, and a powder conveyor. The spray drying tower has a spray drying exhaust gas outlet at its top, which is connected to the cyclone dust collector via a pipe. The cyclone dust collector also has a cyclone exhaust gas outlet at its top, which is connected to the regulating valve, the primary induced draft fan, and the high-temperature medium dust collector via pipes. The high-temperature medium dust collector has a medium dust collection powder outlet at its bottom and a medium dust collection exhaust gas outlet at its top, which is connected to the heat exchanger and the secondary induced draft fan via pipes. The blower is connected to the heat exchanger and the combustion air inlet via pipes. This waste heat recovery system recovers waste heat from the filtered clean high-temperature flue gas to heat the combustion air in the spray drying tower, saving energy and reducing fuel consumption.

Description

Technical Field

[0001] This utility model belongs to the field of spray drying exhaust gas treatment, and in particular relates to a high-temperature purification and waste heat recovery system for spray drying exhaust gas. Background Technology

[0002] Spray drying is a process in which materials undergo dehydration, decomposition, oxidation, reduction, chlorination, sulfation, agglomeration, or pelletizing under conditions below their melting temperature. Spray drying generally requires temperatures above 200°C, and the spray drying tower needs a continuous supply of fuel to maintain this high temperature. Traditional spray drying processes involve introducing fuel and ambient air into the tower to heat the material. The exhaust gas is then discharged after passing through a cyclone dust collector and spray dust suppression system. The heat from the combusted exhaust gas is lost naturally, resulting in high energy consumption, large fuel consumption, and poor economic efficiency. Utility Model Content

[0003] To address the issues of high heat loss and energy consumption in the exhaust gas during spray drying, this utility model discloses a high-temperature purification and waste heat recovery system for spray drying exhaust gas. This system can perform dry fine filtration of particulate matter in the exhaust gas, and then recover the waste heat from the filtered clean high-temperature flue gas to heat the combustion air in the spray drying tower, thereby saving energy and reducing fuel consumption.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-temperature purification and waste heat recovery system for spray drying exhaust gas includes a spray drying tower, a cyclone dust collector, a regulating valve, a primary induced draft fan, a high-temperature medium dust collector, a heat exchanger, a blower, a secondary induced draft fan, and a powder conveyor. The spray drying tower has a gas inlet and a combustion air inlet at its bottom, a spray drying powder outlet at its lower part, and a spray drying exhaust gas outlet at its top. The spray drying exhaust gas outlet is connected to the cyclone dust collector via a pipeline. The cyclone dust collector has a cyclone powder outlet at its bottom and a cyclone exhaust gas outlet at its top. The cyclone exhaust gas outlet is connected to the regulating valve, the primary induced draft fan, and the high-temperature medium dust collector in sequence via pipelines. The high-temperature medium dust collector has a medium dust removal powder outlet at its bottom and a medium dust removal exhaust gas outlet at its upper part. The medium dust removal exhaust gas outlet is connected to the heat exchanger and the secondary induced draft fan in sequence via pipelines. The blower is connected to the heat exchanger and the combustion air inlet in sequence via pipelines.

[0006] Furthermore, the spray drying tower has a raw material inlet at the top and a heat-resistant mesh at the bottom of the spray-dried powder outlet.

[0007] Furthermore, the high-temperature media dust collector includes an upper chamber, a middle chamber, a lower chamber, and a tube sheet. The tube sheet is located between the upper chamber and the middle chamber. The lower chamber is conical and located at the bottom of the middle chamber. The media dust removal exhaust gas outlet is located in the upper chamber, and the media dust removal powder outlet is located at the bottom of the lower chamber.

[0008] Furthermore, the heat exchanger is a shell-and-tube heat exchanger, with a flue gas inlet and a flue gas outlet on the shell side, and an air inlet and an air outlet on the tube side. The dust removal exhaust gas outlet is connected to the flue gas inlet via a pipeline, the flue gas outlet is connected to the secondary induced draft fan via a pipeline, the blower outlet is connected to the air inlet via a pipeline, and the air outlet is connected to the combustion air inlet via a pipeline.

[0009] Furthermore, the spray drying powder outlet, cyclone powder outlet, and media dust removal powder outlet are all connected to the powder conveyor via unloading pipes.

[0010] Furthermore, the spray drying tower, cyclone dust collector, high-temperature medium dust collector, heat exchanger, and connecting pipes are all equipped with heat preservation devices.

[0011] The present invention discloses a high-temperature purification and waste heat recovery system for spray drying exhaust gas. The exhaust gas from the spray drying tower first passes through a cyclone dust collector to remove most of the particulate matter. Then, the high-temperature exhaust gas enters a high-temperature medium dust collector for high-temperature fine filtration and dust removal, resulting in clean high-temperature exhaust gas. This avoids clogging of the heat exchanger during subsequent heat exchange processes. The ambient temperature air is heated by the high-temperature exhaust gas in the heat exchanger and then enters the spray drying tower as fuel combustion air, avoiding the need to heat the ambient temperature air after combustion, thus avoiding ineffective energy loss and significantly reducing fuel consumption. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the high-temperature purification and waste heat recovery system for spray drying exhaust gas described in this utility model.

[0013] Figure 2 This is a schematic diagram of the spray drying tower structure described in this utility model.

[0014] Figure 3 This is a schematic diagram of the high-temperature medium dust collector described in this utility model.

[0015] Figure 4 This is a schematic diagram of the heat exchanger structure described in this utility model.

[0016] Among them, 1-spray drying tower, 2-cyclone dust collector, 3-regulating valve, 4-regulating valve, 5-high temperature medium dust collector, 6-heat exchanger, 7-blower, 8-secondary induced draft fan, 9-powder conveyor, 101-gas inlet, 102-combustion air inlet, 103-spray drying powder outlet, 104-spray drying tail gas outlet, 105-raw material inlet, 106-temperature resistant mesh, 201-cyclone powder outlet, 202-cyclone tail gas outlet, 501-medium dust collector powder outlet, 502-medium dust collector tail gas outlet, 503-upper box, 504-middle box, 505-lower box, 506-tube sheet, 601-flue gas inlet, 602-flue gas outlet, 603-air inlet, 604-air outlet. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] like Figures 1-3 As shown, a spray drying exhaust gas purification and waste heat recovery system includes a spray drying tower 1, a cyclone dust collector 2, a regulating valve 3, a primary induced draft fan 4, a high-temperature medium dust collector 5, a heat exchanger 6, a blower 7, a secondary induced draft fan 8, and a powder conveyor 9. The spray drying tower 1 has a gas inlet 101 and a combustion air inlet 102 at its bottom, a spray drying powder outlet 103 at its lower part, and a spray drying exhaust gas outlet 104 at its top. The spray drying exhaust gas outlet 104 is connected to the cyclone dust collector 2 via a pipe. The spray drying tower 1 has a raw material inlet 105 at its upper part, and a heat-resistant mesh 106 is installed below the spray drying powder outlet 103. The cyclone dust collector 2 has a bottom... A cyclone powder outlet 201 and a cyclone exhaust gas outlet 202 are provided at the top. The cyclone exhaust gas outlet 202 is connected in sequence to a regulating valve 3, a primary induced draft fan 4, and a high-temperature medium dust collector 5 via pipes. The high-temperature medium dust collector 5 has a medium dust removal powder outlet 501 at the bottom and a medium dust removal exhaust gas outlet 502 at the top. The medium dust removal exhaust gas outlet 502 is connected in sequence to a heat exchanger 6 and a secondary induced draft fan 8 via pipes. The blower 7 is connected in sequence to the heat exchanger 6 and the combustion air inlet 102 via pipes. The spray drying powder outlet 103, the cyclone powder outlet 201, and the medium dust removal powder outlet 501 are all connected to a powder conveyor 9 via unloading pipes.

[0019] The high-temperature medium dust collector 5 includes an upper chamber 503, a middle chamber 504, a lower chamber 505, and a tube sheet 506. The tube sheet 506 is located between the upper chamber 503 and the middle chamber 504. The lower chamber 505 is conical and located below the middle chamber 504. The medium dust removal exhaust gas outlet 502 is located in the upper chamber 503, and the medium dust removal powder outlet 501 is located at the bottom of the lower chamber 505.

[0020] The heat exchanger 6 is a shell-and-tube heat exchanger. The shell side has a flue gas inlet 601 and a flue gas outlet 602, and the tube side has an air inlet 603 and an air outlet 604. The dust removal exhaust gas outlet 502 is connected to the flue gas inlet 601 through a pipe. The flue gas outlet 602 is connected to the secondary induced draft fan 8 through a pipe. The outlet of the blower 7 is connected to the air inlet 603 through a pipe. The air outlet 604 is connected to the combustion air inlet 102 through a pipe.

[0021] The spray drying tower 1, cyclone dust collector 2, high-temperature medium dust collector 5, heat exchanger 6, and connecting pipes are all equipped with heat preservation devices.

[0022] Those skilled in the art should understand that the above description is merely a specific embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A spray drying tail gas high temperature purification waste heat recovery system, characterized in that, The system includes a spray drying tower, a cyclone dust collector, a regulating valve, a primary induced draft fan, a high-temperature medium dust collector, a heat exchanger, a blower, a secondary induced draft fan, and a powder conveyor. The spray drying tower has a gas inlet and a combustion air inlet at the bottom, a spray-dried powder outlet at the bottom, and a spray-dried exhaust gas outlet at the top. The spray-dried exhaust gas outlet is connected to the cyclone dust collector via a pipeline. The cyclone dust collector has a cyclone powder outlet at the bottom and a cyclone exhaust gas outlet at the top. The cyclone exhaust gas outlet is connected to the regulating valve, the primary induced draft fan, and the high-temperature medium dust collector via pipelines. The high-temperature medium dust collector has a medium dust removal powder outlet at the bottom and a medium dust removal exhaust gas outlet at the top. The medium dust removal exhaust gas outlet is connected to the heat exchanger and the secondary induced draft fan via pipelines. The blower is connected to the heat exchanger and the combustion air inlet via pipelines.

2. The system according to claim 1, wherein The spray drying tower has a raw material inlet at the top and a heat-resistant mesh at the bottom of the spray-dried powder outlet.

3. The system according to claim 1, wherein The high-temperature media dust collector includes an upper chamber, a middle chamber, a lower chamber, and a tube sheet. The tube sheet is located between the upper chamber and the middle chamber. The lower chamber is conical and located at the bottom of the middle chamber. The exhaust gas outlet of the media dust collector is located in the upper chamber, and the media dust powder outlet is located at the bottom of the lower chamber.

4. The system according to claim 1, wherein The heat exchanger is a shell-and-tube heat exchanger with a flue gas inlet and a flue gas outlet on the shell side, and an air inlet and an air outlet on the tube side. The dust removal exhaust gas outlet is connected to the flue gas inlet via a pipeline, the flue gas outlet is connected to the secondary induced draft fan via a pipeline, the blower outlet is connected to the air inlet via a pipeline, and the air outlet is connected to the combustion air inlet via a pipeline.

5. The system for high temperature purification of spray drying exhaust gas and recovery of waste heat according to claim 1, wherein, The spray drying powder outlet, cyclone powder outlet, and media dust removal powder outlet are all connected to the powder conveyor via unloading pipes.

6. The high-temperature purification and waste heat recovery system for spray drying exhaust gas according to claim 1, characterized in that, The spray drying tower, cyclone dust collector, high-temperature medium dust collector, heat exchanger, and connecting pipes are all equipped with heat preservation devices.

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