Boiler slag waste heat recovery system

Abstract

The invention relates to the technical field of boiler waste heat recovery, in particular to a boiler slag waste heat recovery system which comprises a boiler, a feeding hopper, a coal mill, a powder exhauster, an air feeder, a material conveying assembly, a cooling assembly and a drying assembly, the boiler is sequentially divided into a combustion cavity, a steam cavity and an exhaust cavity from front to back, and the coal mill is fixedly installed at the lower end of the left side of the boiler; the feeding hopper is fixedly installed at the upper end of the coal mill, the powder exhauster is fixedly installed at the upper end of the coal mill and communicates with the combustion cavity, the material conveying assembly is fixedly installed at the lower end of the boiler, the cooling assembly is fixedly installed at the lower end of the right side of the boiler, and the drying assembly is fixedly installed at the upper end of the cooling assembly. Slag is conveyed to the cooling assembly through the material conveying assembly to be cooled to generate steam, the steam reversely passes through the material conveying assembly to enter the steam cavity and absorb heat of the slag in the material conveying assembly, and the steam and smoke exhausted from the combustion cavity enter the drying assembly together to dry the cooled slag and exhaust the slag.

Description

Technical Field

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

[0002] Energy consumption of China's steel industry accounts for 10% to 15% of the country's total energy consumption. At present, the main steel production processes are ironmaking and steelmaking, and the ironmaking process consumes the most resources and energy, accounting for about 77% of the entire steel production process. There are few devices for waste heat recovery in major steel plants in China. Since the energy consumption of ironmaking plants is mainly in the sintering process and ironmaking process, the slag treatment in the ironmaking process is not only the post-treatment utilization of the slag, but also the waste heat recovery of the slag. At present, the blast furnace slag treatment method used in China is mainly based on water quenching.

[0003] The water quenching method is to quickly cool the material by directly contacting the high-temperature slag with cooling water. At the same time, the cooling water absorbs the heat released by the material and is used for bath water, heating and power generation, thereby realizing the recovery and utilization of waste heat. The cooled slag is scooped up by a slag scoop machine, and after drying and crushing, it can be used to make cement, fertilizer, etc.

[0004] However, during the water quenching process, the slag is not discharged continuously but intermittently, while the cooling water is continuously circulated. In this way, when the slag is not discharged, a large amount of cooling water is discharged without cooling the slag and is wasted. In addition, a large amount of high-temperature steam is generated during the water quenching process. This part of high-temperature steam carries a large amount of heat but is not directly utilized, resulting in heat loss. Because there are still a large amount of sulfides in the slag, gases such as HS and SO will be generated during the cooling process. If they are not treated, they will cause air pollution.

[0005] In order to solve the above problems, a boiler slag waste heat recovery system is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a boiler slag waste heat recovery system to solve the problem that during the water quenching process, the slag is not discharged continuously but intermittently, but the cooling water is continuously circulated. In this way, when the slag is not discharged, a large amount of cooling water is discharged and wasted without cooling the slag. In addition, a large amount of high-temperature steam is generated during the water quenching process. This part of the high-temperature steam carries a large amount of heat but is not directly utilized, resulting in heat loss. Because there are still a large amount of sulfides in the slag, gases such as HS and SO will be generated during the cooling process. If they are not handled, they will cause air pollution.

[0007] In order to achieve the above technical objectives, the present invention provides the following technical solutions:

[0008] A boiler slag waste heat recovery system comprises: a boiler, a hopper, a coal mill, a powder discharger, a steam drum, a blower, a superheater, an economizer, an air preheater, a material transport component, a cooling component, and a drying component. The boiler is divided into a combustion chamber, a steam chamber, and an exhaust chamber from front to back. The coal mill is fixedly mounted on the lower left end of the boiler, the hopper is fixedly mounted on the upper end of the coal mill, the powder discharger is fixedly mounted on the upper end of the coal mill and is connected with the combustion chamber, the steam drum is fixedly mounted on the upper end of the left outer wall of the boiler, the superheater is fixedly mounted on the upper end of the inner wall of the combustion chamber, the economizer and the air preheater are fixedly mounted on the inner wall side of the exhaust chamber from top to bottom, the material transport component is fixedly mounted on the lower end of the boiler, the cooling component is fixedly mounted on the lower right end of the boiler, and the drying component is fixedly mounted on the upper end of the cooling component. The slag is transported to the cooling component through the material transport component for cooling and generating steam. The steam passes through the material transport component in the reverse direction into the steam chamber and absorbs the heat of the slag in the material transport component, and enters the drying component together with the smoke discharged from the combustion chamber to dry the cooled slag and discharge it.

[0009] Preferably, the material transport assembly includes a conveyor belt, a slag dropping chamber, a slag dropping gate, and a transfer chamber. The slag dropping chamber is fixedly installed at the lower end of the boiler, and the slag dropping chamber is divided into an upper chamber and a lower chamber from top to bottom. The slag dropping gate is rotatably installed between the combustion chamber and the slag dropping chamber, and the transfer chamber is fixedly installed between the slag dropping chamber and the cooling assembly. The conveyor belt is fixedly installed between the upper chamber and the lower chamber and passes through the transfer chamber.

[0010] In the above scheme, when the slag dropping gate is opened, a large amount of high-temperature slag will fall onto the conveyor belt. The high temperature will cause a large amount of air in the slag dropping chamber to move upward and enter the steam chamber in the boiler. At this time, the gas in the cooling component and the high-temperature steam generated by the cooling slag will be sucked into the slag dropping chamber. In this process, the gas in the cooling component will carry a large amount of water vapor into the slag dropping chamber. The water vapor will evaporate when it encounters high temperature and absorb a large amount of heat from the slag. Because high-temperature slag of poor quality may explode if it falls directly into the water, it is pre-cooled at this time to prevent it from exploding. At the same time, a lower chamber is set at the lower end of the slag dropping chamber to allow cooling water to flow through the lower end of the conveyor belt to absorb the heat of the slag while cooling the surface of the conveyor belt to prevent the conveyor belt from being deformed due to excessive temperature.

[0011] Preferably, the cooling assembly includes a cooling chamber, a water injection column, and a filter screen. The cooling chamber is fixedly installed on one side of the slag dropping chamber and fixedly connected to the conveying chamber. The water injection column passes through the drying assembly and is vertically fixed at the center of the cooling chamber. The filter screen is fixedly installed at the interface between the cooling chamber and the conveying chamber at the lower end of the conveyor belt.

[0012] In the above scheme, in order to prevent the slag from being fished out before being completely cooled after entering the water, a water injection column and a drying component are used in coordination. During the process of the drying component transporting the slag upward, the water injection column will further cool the slag.

[0013] Preferably, the drying assembly includes a drying chamber, a transport column, a transport pipe, an air intake pipe, an exhaust pipe, a chimney, and a filter. The drying chamber is fixedly installed at the upper end of the cooling chamber, the transport pipe is opened between the drying chamber and the cooling chamber and passes through the drying chamber and the cooling chamber, the transport column is fixedly installed on the outside of the water injection column, the air intake pipe connects the exhaust cavity and the drying chamber, the chimney is fixedly installed on the side of the drying chamber away from the boiler, the air intake pipe connects the chimney and the drying chamber, and the filter is fixedly installed on the inside of the chimney.

[0014] In the above scheme, because the slag produced by the water quenching method must be dried before use, the high-temperature gas discharged from the exhaust chamber will enter the drying chamber from the air inlet pipe, and can dry the cooled slag. At the same time, the gas is discharged into the atmosphere through the filter in the chimney to avoid SO and HS in the flue gas and steam from polluting the air. At the same time, the high-temperature gas flow is used to remove impurities such as ash in the slag.

[0015] Preferably, a flow control component is fixedly installed in the cooling component, including a water bubble, an outer valve body, an inner valve body, a centrifugal ball, connecting rod one and connecting rod two. The water bubble is fixedly installed on the upper end of the water injection column, the inner valve body is fixedly installed on the upper end of the water bubble and a drainage groove is opened at the bottom, one end of the connecting rod one is hinged to the upper end of the inner valve body, one end of the connecting rod two is hinged to the other end of the connecting rod one and the center position is hinged to one side of the outer valve body, and the centrifugal ball is fixedly connected to the other end of the connecting rod two.

[0016] In the above scheme, when the gas in the exhaust chamber is blown to the drying chamber to drive the fan blades to rotate, the water bubbles rotate accordingly, driving the centrifugal ball to rotate. Due to the centrifugal force, the centrifugal ball will move upward, driving the outer valve body to move upward to increase the cooling water flow. When there is more slag, there is more water vapor, which pushes the fan blades to rotate faster. At this time, the outer valve body moves up more and the cooling water flow is greater. Because the slag is discharged intermittently, this method can effectively control the water flow entering the cooling chamber, which can greatly reduce the waste of water resources.

[0017] Preferably, a preheating chamber is provided at the lower end of the coal mill, and the preheating chamber is connected to the lower chamber. When cooling water passes through the preheating chamber, the cooling water that has absorbed a large amount of heat will preheat the material entering the coal mill, making it easier for the material to reach the ignition point after entering the combustion chamber.

[0018] Preferably, the wall between the combustion chamber and the steam chamber is made of heat-conducting material.

[0019] In the above scheme, the wall between the combustion chamber and the steam chamber is made of heat-conducting material, and the high temperature of the combustion chamber is used to further remove the water vapor contained in the steam, so as to facilitate the subsequent drying of the slag.

[0020] Preferably, fan blades are fixedly mounted on the top of the transport column in the drying chamber.

[0021] In the above scheme, when the air flow enters the drying bin through the air inlet pipe, it drives the fan blades and the transport column to rotate, and transports the slag to the drying chamber. The more slag there is, the more gas generated in the combustion chamber and the more water vapor generated in the cooling chamber, which drives the fan blades to rotate faster and the transport efficiency is higher, thus avoiding accumulation of slag in the cooling chamber when there is too much slag.

[0022] Preferably, an air duct is fixedly installed on the outer wall of the transmission chamber, one end of the air duct is fixedly connected to the blower and the other end is fixedly connected to the air preheater through the wall of the steam chamber and the exhaust chamber, and the connecting part between the transmission chamber and the air duct is made of heat-conducting material.

[0023] In the above scheme, when the blower passes the air into the air preheater through the air duct, it absorbs part of the heat in the transfer chamber and preheats the air entering the combustion chamber.

[0024] Preferably, a heat-insulating chamber is provided on the outer side of the inner part of the drying chamber of the water injection column, and the fan blades penetrate the heat-insulating chamber and are directly connected to the water injection column.

[0025] In the above scheme, an insulating chamber is opened to prevent the hot air in the drying chamber from heating the cooling water in the water injection column. The fan blades pass through the insulating chamber so that the water injection column has a cooling effect on the fan blades, preventing the fan blades from being damaged by small particles of slag in a high temperature environment. At the same time, the fan blades are fixed to prevent excessive wind pressure from damaging the fan blades.

[0026] The beneficial effects of the present invention are as follows:

[0027] In the existing water quenching process, the slag is not discharged continuously but intermittently, while the cooling water is continuously circulated. In this way, when the slag is not discharged, a large amount of cooling water is discharged without cooling the slag and is wasted, and water resources cannot be used rationally. The present invention provides a flow control component and utilizes the large amount of steam generated by the slag entering the cooling water to control the rotation speed of the flow control component, thereby controlling the cooling water flow through centrifugal force and avoiding wasting a large amount of water resources.

[0028] The present invention arranges a transmission component and utilizes the large amount of heat generated by the slag entering the slag dropping chamber to attract the gas in the cooling chamber to carry a large amount of water vapor into the slag dropping chamber. The water vapor evaporates in response to high temperature and absorbs a large amount of heat from the slag, thereby pre-cooling the slag to prevent it from exploding. At the same time, a lower chamber is arranged at the lower end of the slag dropping chamber to allow cooling water to flow through the lower end of the conveyor belt. While absorbing the heat from the slag, the surface of the conveyor belt is cooled to prevent the conveyor belt from being deformed due to excessive temperature.

[0029] The present invention provides a drying component to dry the cooled slag with the high-temperature gas discharged from the exhaust chamber. After drying, the gas is discharged into the atmosphere through a filter in the chimney to avoid air pollution by SO and HS in the flue gas and steam. At the same time, the high-temperature gas is quickly flowed in the drying chamber to remove impurities such as ash in the slag, thereby improving the quality of the slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and other aspects of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0031] Figure 1 It is a schematic diagram of the shaft side structure of the present invention;

[0032] Figure 2 It is a schematic diagram of the axial side section of the present invention;

[0033] Figure 3 It is a cross-sectional schematic diagram of the transmission component of the present invention;

[0034] Figure 4 It is a cross-sectional schematic diagram of the cooling component and the drying component of the present invention;

[0035] Figure 5 It is a schematic diagram of the structure of the flow control component of the present invention;

[0036] Figure 6 This is a schematic diagram of the slag cooling and drying process of the present invention;

[0037] Figure 7 It is a schematic diagram of the cooling water flow process of the present invention;

[0038] Figure 8 Schematic diagram of the gas flow process of the present invention.

[0039] In the figure: 1. boiler; 101. combustion chamber; 102. steam chamber; 103. exhaust chamber; 2. hopper; 3. coal mill; 31. preheating chamber; 4. powder discharger; 5. steam drum; 6. blower; 61. air guide pipe; 7. superheater; 8. economizer; 9. air preheater; 10. material transport assembly; 1001. conveyor belt; 1002. slag chamber; 10021. upper chamber; 10022. lower chamber; 1003. slag gate; 1004. transport chamber; 11. cooling assembly; 1101. cooling chamber; 11 02. Water injection column; 1103. Filter; 12. Drying component; 1201. Drying chamber; 1202. Transport column; 1203. Transport pipe; 1204. Inlet pipe; 1205. Exhaust pipe; 1206. Chimney; 1207. Filter; 1208. Fan blade; 1209. Insulation chamber; 13. Flow control component; 1301. Bubble; 1302. Outer valve body; 1303. Inner valve body; 1304. Centrifugal ball; 1305. Connecting rod one; 1306. Connecting rod two; 1307. Drain trough. DETAILED DESCRIPTION

[0040] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0041] As an embodiment of the present invention, reference Figure 2 A boiler slag waste heat recovery system comprises: a boiler 1, a feed hopper 2, a coal mill 3, a powder discharger 4, a steam drum 5, a blower 6, a superheater 7, an economizer 8, an air preheater 9, a material transport component 10, a cooling component 11, and a drying component 12. The boiler 1 is divided into a combustion chamber 101, a steam chamber 102, and an exhaust chamber 103 from front to back. The coal mill 3 is fixedly mounted on the lower left end of the boiler 1, the feed hopper 2 is fixedly mounted on the upper end of the coal mill 3, the powder discharger 4 is fixedly mounted on the upper end of the coal mill 3 and is connected to the combustion chamber 101, the steam drum 5 is fixedly mounted on the upper end of the left outer wall of the boiler 1, and the superheater 7 is fixedly mounted on the upper end of the left outer wall of the boiler 1. The economizer 8 and the air preheater 9 are fixedly installed on the inner wall side of the exhaust chamber 103 from top to bottom, the material transport component 10 is fixedly installed on the lower end of the boiler 1, the cooling component 11 is fixedly installed on the lower right end of the boiler 1, and the drying component 12 is fixedly installed on the upper end of the cooling component 11. The slag is transported to the cooling component 11 through the material transport component 10 to be cooled and generate steam. The steam passes through the material transport component 10 in the reverse direction and enters the steam chamber 102 to absorb the heat of the slag in the material transport component 10, and enters the drying component 12 together with the flue gas discharged from the combustion chamber 101 to dry the cooled slag and discharge it.

[0042] As an embodiment of the present invention, reference Figure 2 and Figure 3The material transport component 10 includes a conveyor belt 1001, a slag chamber 1002, a slag gate 1003, and a transmission chamber 1004. The slag chamber 1002 is fixedly installed at the lower end of the boiler 1. The slag chamber 1002 is divided into an upper chamber 10021 and a lower chamber 10022 from top to bottom. The slag gate 1003 is rotatably installed between the combustion chamber 101 and the slag chamber 1002. The transmission chamber 1004 is fixedly installed between the slag chamber 1002 and the cooling component 11. The conveyor belt 1001 is fixedly installed between the upper chamber 10021 and the lower chamber 10022 and passes through the transmission chamber 1004. When the slag gate 1003 is opened, a large amount of high-temperature slag will fall onto the conveyor belt 1001, and the high temperature will cause the slag chamber 100 2 A large amount of air moves upward and enters the steam chamber 102 in the boiler 1. At this time, the gas in the cooling component 11 and the high-temperature steam generated by the cooling slag will be sucked into the slag dropping chamber 1002. In this process, the gas in the cooling component 11 will carry a large amount of water vapor into the slag dropping chamber 1002. The water vapor will evaporate at high temperature and absorb a large amount of heat from the slag. Because high-temperature slag of poor quality may explode if it falls directly into the water, it is pre-cooled at this time to prevent it from exploding. At the same time, a lower chamber 10022 is set at the lower end of the slag dropping chamber 1002 to allow cooling water to flow through the lower end of the conveyor belt 1001 to absorb the heat of the slag, while cooling the surface of the conveyor belt 1001 to prevent the conveyor belt 1001 from being deformed due to excessive temperature.

[0043] As an embodiment of the present invention, reference Figure 3 and Figure 4 The cooling assembly 11 includes a cooling chamber 1101, a water injection column 1102, and a filter screen 1103. The cooling chamber 1101 is fixedly installed on one side of the slag chamber 1002 and is fixedly connected to the conveying chamber 1004. The water injection column 1102 passes through the drying assembly 12 and is vertically fixedly installed at the center of the cooling chamber 1101. The filter screen 1103 is fixedly installed at the interface between the cooling chamber 1101 and the conveying chamber 1004 at the lower end of the conveyor belt 1001. In order to prevent the slag from being fished out before being completely cooled after entering the water, the water injection column 1102 and the drying assembly 12 are used in coordination. During the process of the drying assembly 12 transporting the slag upward, the water injection column 1102 will further cool the slag.

[0044] As an embodiment of the present invention, reference Figure 2 and Figure 4The drying component 12 includes a drying chamber 1201, a transport column 1202, a transport pipe 1203, an air intake pipe 1204, an exhaust pipe 1205, a chimney 1206, and a filter 1207. The drying chamber 1201 is fixedly installed at the upper end of the cooling chamber 1101. The transport pipe 1203 is opened between the drying chamber 1201 and the cooling chamber 1101 and passes through the drying chamber 1201 and the cooling chamber 1101. The transport column 1202 is fixedly installed on the outside of the water injection column 1102. The air intake pipe 1204 connects the exhaust cavity 103 and the drying chamber 1201. The chimney 1206 is fixedly installed on the side of the drying chamber 1201 away from the boiler 1. The air intake pipe 1204 connects the chimney 1206 and the drying chamber 1201. The filter 1207 is fixedly installed on the inner side of the chimney 1206. Because the slag produced by the water quenching method must be dried before use, the high-temperature gas discharged from the exhaust chamber 103 will enter the drying chamber 1201 from the air inlet pipe 1204, and can dry the cooled slag. At the same time, the gas will pass through the filter 1207 in the chimney 1206 and then be discharged into the atmosphere to prevent SO and HS in the flue gas and steam from polluting the air. At the same time, the high-temperature gas flow is used to remove impurities such as ash in the slag.

[0045] As an embodiment of the present invention, reference Figure 4 and Figure 5 A flow control component 13 is fixedly installed in the cooling component 11, including a water bubble 1301, an outer valve body 1302, an inner valve body 1303, a centrifugal ball 1304, a connecting rod 1305, and a connecting rod 2 1306. The water bubble 1301 is fixedly installed on the upper end of the water injection column 1102, the inner valve body 1303 is fixedly installed on the upper end of the water bubble 1301 and a drainage groove 1307 is opened at the bottom, one end of the connecting rod 1 1305 is hinged to the upper end of the inner valve body 1303, one end of the connecting rod 2 1306 is hinged to the other end of the connecting rod 1 1305 and the center position is hinged to one side of the outer valve body 1302, and the centrifugal ball 1304 is fixedly connected to the other end of the connecting rod 2 1306. When the gas in the exhaust chamber 103 is blown to the drying chamber 1201, driving the fan blades 1208 to rotate, the water bubble 1301 rotates accordingly, driving the centrifugal ball 1304 to rotate. Due to the centrifugal force, the centrifugal ball 1304 will move upward, driving the outer valve body 1302 to move upward to increase the exposed area of ​​the drainage groove 1307. When there is more slag, there is more water vapor, which pushes the fan blades 1208 to rotate faster. At this time, the outer valve body 1302 moves up more and the cooling water flow is larger. Because the slag is discharged intermittently, this method can effectively control the water flow entering the cooling chamber 1101, which can greatly reduce the waste of water resources.

[0046] As an embodiment of the present invention, reference Figure 2A preheating chamber 31 is provided at the lower end of the coal mill 3, and the preheating chamber 31 is connected to the lower chamber 10022. When the cooling water passes through the preheating chamber 31, the cooling water that absorbs a large amount of heat will preheat the material entering the coal mill 3, so that it is easier to reach the ignition point after entering the combustion chamber 101.

[0047] As an embodiment of the present invention, reference Figure 1 The wall between the combustion chamber 101 and the steam chamber 102 is made of heat-conducting material, and the high temperature of the combustion chamber 101 is used to further remove the water vapor contained in the steam, so as to facilitate the subsequent drying of the slag.

[0048] As an embodiment of the present invention, reference Figure 4 The top of the transport column 1202 is fixedly installed with a fan blade 1208 in the drying chamber 1201. When the air flow enters the drying chamber through the air inlet pipe 1204, it drives the fan blade 1208 and the transport column 1202 to rotate, and the slag is transported to the drying chamber 1201. When there is more slag, the more gas generated by the combustion chamber 101 and the more water vapor generated by the cooling chamber 1101, which drives the fan blade 1208 to rotate faster and the transportation efficiency is higher, thus avoiding accumulation of slag in the cooling chamber 1101 when there is too much slag.

[0049] As an embodiment of the present invention, reference Figure 2 The outer wall of the transmission chamber 1004 is fixedly installed with an air guide pipe 61, one end of which is fixedly connected to the blower 6 and the other end of which is fixedly connected to the air preheater 9 through the sandwich wall of the steam chamber 102 and the exhaust chamber 103, and the connecting part between the transmission chamber 1004 and the air guide pipe 61 is made of heat-conducting material. When the blower 6 passes air into the air preheater 9 through the air guide pipe 61, it absorbs part of the heat in the transmission chamber 1004 and preheats the air entering the combustion chamber 101.

[0050] As an embodiment of the present invention, reference Figure 4 The water injection column 1102 is provided with an insulating chamber 1209 on the outer side of the drying chamber 1201, and the fan blade 1208 passes through the insulating chamber 1209 and is directly connected to the water injection column 1102. The insulating chamber 1209 is provided to prevent the hot air in the drying chamber from heating the cooling water in the water injection column 1102, and the fan blade 1208 passes through the insulating chamber 1209 so that the water injection column 1102 has a cooling effect on the fan blade 1208, thereby preventing the fan blade 1208 from being damaged by the impact of small particles of slag in a high temperature environment, and at the same time fixing the fan blade 1208 to prevent the fan blade 1208 from being damaged by excessive wind pressure.

[0051] Working principle: After the slag falls into the slag dropping chamber 1002, it is transported to the cooling component 11 through the conveyor belt 1001 to be cooled and generate steam. In this process, the steam will pass through the material transport component 10 in the reverse direction and enter the steam chamber 102. In this process, the water vapor carried in the steam will evaporate and absorb the heat of the slag in the material transport component 10, and enter the drying component 12 together with the flue gas discharged from the combustion chamber 101 to dry the cooled slag, and drive the fan blades 1208 to rotate, drive the transport column 1202 to rotate, and transport the slag to the drying chamber 1201. At the same time, the cooling water flow rate is controlled by the flow control component 13. After the high-temperature gas dries the cooled coal slag, the toxic gas is filtered out by the filter 1207 and then discharged.

[0052] Example:

[0053] Slag cooling and drying process: After the material is burned in the combustion chamber 101, it becomes slag. The slag gate 1003 opens automatically at regular intervals. At this time, the slag will fall onto the conveyor belt 1001. The conveyor belt 1001 transports the slag to the cooling chamber 1101 for cooling. At the same time, the transport column 1202 continues to rotate to transport the slag to the drying chamber 1201 for drying.

[0054] Cooling water flow process: The cooling water enters the water bubble 1301 through the flow control component 13, and then enters the cooling chamber 1101 through the water injection column 1102. The water injection column 1102 is arranged in the transport column 1202, so when the transport column 1202 transports the slag to the drying chamber 1201, the cooling water in the water injection column 1102 will further cool the slag. After the cooling water enters the cooling chamber 1101, it cools the slag, and when the liquid level reaches a certain height, the cooling water will pass through The conveying chamber 1004 enters the lower chamber 10022 of the slag dropping chamber 1002. At this time, the cooling water will cool the surface of the conveyor belt 1001 to ensure that the surface temperature of the conveyor belt 1001 is not too high, and prevent the conveyor belt 1001 from being deformed by the force of the falling slag under high temperature. After absorbing the heat of the conveyor belt 1001 and the slag, the cooling water will enter the preheating chamber 31 to preheat the material processed by the coal mill 3, and then the cooling water will be discharged from the preheating chamber 31.

[0055] Gas flow process: when the slag gate 1003 is automatically opened at a certain interval, the slag will fall onto the conveyor belt 1001, and the gas in the slag chamber 1002 absorbs high temperature and moves upward into the steam chamber 102. At this time, the air pressure in the slag chamber 1002 is relatively low, which will attract the slag to enter the cooling water and generate a large amount of steam into the slag chamber 1002. At this time, a large amount of water vapor carried by the steam will evaporate on the surface of the slag, pre-cooling the slag to prevent the slag from directly entering the cooling water and easily causing an explosion. At this time, the steam that absorbs heat will also move upward into the steam chamber 102, and the gas entering the steam chamber 102 will enter the exhaust chamber 103 together with the flue gas discharged from the combustion chamber 101, and enter the drying chamber through the air inlet pipe 1204 to dry the cooled slag, and at the same time push the fan blade 1208 to rotate, drive the transport column 1202 to rotate, and transport the cooled slag to the drying chamber, and then the gas is discharged into the chimney 1206 through the exhaust pipe 1205, and is discharged after being filtered by the filter 1207.

[0056] Flow control process: when the gas in the exhaust chamber 103 is blown to the drying chamber 1201 and drives the fan blades 1208 to rotate, the water bubble 1301 rotates accordingly, driving the centrifugal ball 1304 to rotate. Due to the centrifugal force, the centrifugal ball 1304 will move upward, driving the connecting rod 1306 to rotate, and driving the outer valve body 1302 to move upward to increase the exposed area of ​​the drainage groove 1307. When there is more slag, there is more water vapor, which pushes the fan blades 1208 to rotate faster. At this time, the outer valve body 1302 moves up more and the cooling water flow is larger. Because the slag is discharged intermittently, the water flow entering the cooling chamber 1101 can be effectively controlled in this way.

[0057] Preheating process: When the blower 6 passes the air into the air preheater 9 through the air duct 61, it will absorb part of the heat in the transfer chamber 1004, and preheat the air entering the combustion chamber 101. Then the air absorbs the heat of the high-temperature gas in the exhaust chamber 103 in the air preheater 9, and is preheated for a second time. Then, it is discharged into the combustion chamber 101 for auxiliary combustion. A preheating chamber 31 is provided at the lower end of the coal mill 3, and the preheating chamber 31 is connected to the lower chamber 10022. When the cooling water passes through the preheating chamber 31, the cooling water that has absorbed a large amount of heat will preheat the material entering the coal mill 3, so that it is easier to reach the ignition point after entering the combustion chamber 101.

[0058] The foregoing is merely an excerpt from the disclosure that these modifications may be made to the invention in light of the above detailed description. The terms used in the appended claims should not be construed to limit the invention to the specific embodiments disclosed in the specification. Instead, the scope of the invention will be determined entirely by the appended claims, which will be interpreted in accordance with established principles of claim interpretation.

Claims

1. A boiler slag waste heat recovery system, comprising: A boiler (1), a feed hopper (2), a coal mill (3), a powder discharger (4), a steam drum (5), a blower (6), a superheater (7), a coal economizer (8), and an air preheater (9); characterized in that it also includes a material transport component (10), a cooling component (11), and a drying component (12); the boiler (1) is divided into a combustion chamber (101), a steam chamber (102), and an exhaust chamber (103) from left to right; the coal mill (3) is fixedly mounted on the lower left end of the boiler (1); the feed hopper (2) is fixedly mounted on the upper end of the coal mill (3); the powder discharger (4) is fixedly mounted on the upper end of the coal mill (3) and is connected to the combustion chamber (101); the steam drum (5) is fixedly mounted on the upper end of the outer wall of the left side of the boiler (1); the superheater (7) is fixedly mounted on the upper end of the outer wall of the left side of the boiler (1); The device (7) is fixedly mounted on the upper end of the inner wall of the combustion chamber (101); the economizer (8) and the air preheater (9) are fixedly mounted on the inner wall side of the exhaust chamber (103) in order from top to bottom; the material transport component (10) is fixedly mounted on the lower end of the boiler (1); the cooling component (11) is fixedly mounted on the right side of the material transport component (10); and the drying component (12) is fixedly mounted on the upper end of the cooling component (11); the slag is transported to the cooling component (11) through the material transport component (10) to be cooled and generate steam; the steam passes through the material transport component (10) in the reverse direction and enters the steam chamber (102) and absorbs the heat of the slag in the material transport component (10); and enters the drying component (12) together with the smoke discharged from the combustion chamber (101) to dry the cooled slag and discharge it.

2. A boiler slag waste heat recovery system according to claim 1, characterized in that: The material transport component (10) comprises a conveyor belt (1001), a slag dropping chamber (1002), a slag dropping gate (1003), and a conveying chamber (1004); the slag dropping chamber (1002) is fixedly installed at the lower end of the boiler (1); the slag dropping chamber (1002) is divided into an upper chamber (10021) and a lower chamber (10022) from top to bottom; the slag dropping gate (1003) is rotatably connected between the combustion chamber (101) and the slag dropping chamber (1002) via a rotating shaft; the conveying chamber (1004) is fixedly installed between the slag dropping chamber (1002) and the cooling component (11); and the conveyor belt (1001) is fixedly installed between the upper chamber (10021) and the lower chamber (10022) and passes through the conveying chamber (1004).

3. A boiler slag waste heat recovery system according to claim 2, characterized in that: The cooling assembly (11) comprises a cooling chamber (1101), a water injection column (1102), and a filter screen (1103); the cooling chamber (1101) is fixedly installed on the right side of the slag dropping chamber (1002) and is fixedly connected to the conveying chamber (1004); the water injection column (1102) passes through the drying assembly (12) and is vertically fixedly installed at the center of the cooling chamber (1101); and the filter screen (1103) is fixedly installed at the interface between the cooling chamber (1101) and the conveying chamber (1004) at the lower end of the conveyor belt (1001).

4. A boiler slag waste heat recovery system according to claim 3, characterized in that: The drying assembly (12) comprises a drying chamber (1201), a transport column (1202), a transport pipe (1203), an air inlet pipe (1204), an exhaust pipe (1205), a chimney (1206), and a filter (1207); the drying chamber (1201) is fixedly installed at the upper end of the cooling chamber (1101); the transport pipe (1203) is fixedly installed between the drying chamber (1201) and the cooling chamber (1101) and passes through the drying chamber (1201) and the cooling chamber (1101). 1), the transport column (1202) is fixedly installed on the outside of the water injection column (1102), the air inlet pipe (1204) is connected to the exhaust chamber (103) and the drying chamber (1201), the chimney (1206) is fixedly installed on the right side of the drying chamber (1201), the exhaust pipe (1204) is fixedly installed on the right side of the drying chamber (1201) and connects the chimney (1206) and the drying chamber (1201), and the filter (1207) is fixedly installed on the inside of the chimney (1206).

5. A boiler slag waste heat recovery system according to claim 4, characterized in that: A flow control component (13) is fixedly installed in the cooling component (11), comprising a water bubble (1301), an outer valve body (1302), an inner valve body (1303), a centrifugal ball (1304), a connecting rod 1 (1305), and a connecting rod 2 (1306). The water bubble (1301) is fixedly installed on the upper end of the water injection column (1102), and the inner valve body (1303) is fixedly installed on the upper end of the water bubble (1301) and has a bottom opening. There is a drainage groove (1307), one end of the connecting rod one (1305) is hinged to the upper end of the inner valve body (1303), the outer valve body (1302) is slidably connected to the outside of the inner valve body (1303), one end of the connecting rod two (1306) is hinged to the other end of the connecting rod one (1305) and the center position is hinged to one side of the outer valve body (1302), and the centrifugal ball (1304) is fixedly connected to the other end of the connecting rod two (1306).

6. A boiler slag waste heat recovery system according to claim 4, characterized in that The top of the transport column (1202) is fixedly provided with a fan blade (1208) in the drying chamber (1201).

7. The boiler slag waste heat recovery system according to claim 2, characterized in that: A preheating chamber (31) is provided at the lower end of the coal mill (3), and the preheating chamber (31) is connected to the lower chamber (10022).

8. The boiler slag waste heat recovery system according to claim 1, characterized in that: The wall between the combustion chamber (101) and the steam chamber (102) is made of heat-conducting material.

9. The boiler slag waste heat recovery system according to claim 2, characterized in that: An air guide pipe (61) is fixedly mounted on the outer wall of the transmission chamber (1004); the right end of the air guide pipe (61) is fixedly connected to the blower (6); the other end is fixedly connected to the air preheater (9) through the sandwich wall of the steam chamber (102) and the exhaust chamber (103); and the connecting portion between the transmission chamber (1004) and the air guide pipe (61) is made of heat-conducting material.

10. The boiler slag waste heat recovery system according to claim 8, characterized in that: A heat-insulating chamber (1209) is provided inside the drying chamber (1201). The heat-insulating chamber is fixedly mounted on the outer side of the water injection column (1102) inside the drying chamber (1201). The fan blade (1208) passes through the heat-insulating chamber (1209) and is directly connected to the water injection column (1102).

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