Yellow phosphorus tail gas boiler coupling pellet ore drying device
By coupling a yellow phosphorus tail gas boiler with a pellet drying device, the tail gas is used to generate electricity and dry the pellets, thus solving the problem of resource utilization of yellow phosphorus tail gas and achieving efficient energy utilization and environmental protection.
Patent Information
- Application Number
- CN202520078555.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-13
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-13
AI Technical Summary
Existing technologies cannot effectively utilize yellow phosphorus tail gas as a resource, leading to energy waste and environmental pollution.
Design a yellow phosphorus tail gas boiler coupled with a pellet drying device. The tail gas heat energy is used to generate steam for power generation through a steam boiler, and the high-temperature tail gas is used for drying pellets, realizing the dual utilization of tail gas.
This improved the utilization rate of yellow phosphorus tail gas, reduced electricity costs for production, reduced environmental pollution, and realized the resource utilization of tail gas.
Smart Images
Figure CN223840864U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of drying equipment in chemical production, and in particular to a drying device for yellow phosphorus tail gas boiler coupled with pellet ore drying. Background Technology
[0002] my country is a major producer of yellow phosphorus, with a thriving industry and a significant share of global annual output, continuously supplying key raw materials to numerous industries. Along with the development and expansion of the phosphorus chemical industry, the emission of yellow phosphorus tail gas in my country has been continuously increasing. The amount of tail gas generated annually from yellow phosphorus production in my country is staggering, reaching billions of cubic meters. However, the utilization rate of this massive volume of yellow phosphorus tail gas has long remained at a low level. This low utilization rate has brought about a series of serious problems. On the one hand, it results in a huge loss of energy, with large amounts of tail gas that could have been reused and converted into effective heat sources being emitted into the atmosphere without any value. On the other hand, various pollutants contained in the tail gas, such as carbon dioxide, particulate matter, highly irritating sulfur dioxide, and harmful fluorides, enter the environment in large quantities with the emissions, placing a heavy burden on the ecosystem and exacerbating air pollution and other environmental problems.
[0003] To address the issue of yellow phosphorus tail gas, some companies have adopted a pre-treated approach, directly using the gas as fuel in the combustion process. While this reduces pollution from direct emissions and lessens their reliance on traditional heat sources, the exhaust gas is typically cooled and then desulfurized before being released, resulting in a significant waste of flue gas heat. Secondly, some companies use heat exchange to directly use yellow phosphorus tail gas as a heat source for heating production or domestic water, but hot water usage is limited, especially in summer when demand is even lower. This method limits the utilization of yellow phosphorus tail gas and fails to effectively realize its resource utilization. Utility Model Content
[0004] In view of the shortcomings of the existing technology, the technical problem solved by this utility model is to provide a yellow phosphorus tail gas boiler coupled with pellet drying device, which solves the problem that the existing technology cannot effectively realize the resource utilization of yellow phosphorus tail gas.
[0005] To solve the above problems, the technical solution adopted by this utility model is: a yellow phosphorus tail gas boiler coupled with pellet drying device, including a steam boiler, an induced draft fan, a blower, a pellet drying box, and a dust collector arranged sequentially along the tail gas flow direction; the steam outlet of the steam boiler is connected to a steam turbine, the induced draft fan is located in a first air duct, the blower is located in a second air duct, the two ends of the first air duct are respectively connected to the exhaust port of the steam boiler and the air inlet of the second air duct, the air outlet of the second air duct is connected to the air inlet of the pellet drying box, and the air outlet of the pellet drying box is connected to the dust collector.
[0006] The technical principle and beneficial effects of this scheme are as follows: This scheme utilizes yellow phosphorus tail gas in a steam boiler. The heat released from the combustion of the yellow phosphorus tail gas in the boiler furnace heats water into steam with a certain pressure and temperature. The high-temperature, high-pressure steam then enters a steam turbine. The steam expands and performs work within the turbine, driving its rotor. The turbine rotor is connected to a generator rotor via a coupling, thus generating electricity. This utilizes yellow phosphorus tail gas as fuel for power generation, reducing the factory's electricity load and saving on production costs. Secondly, the high-temperature yellow phosphorus tail gas, after combustion, enters the second duct through the first duct's induced draft fan, and then enters the pelletizing production line. A blower then sends the high-temperature yellow phosphorus tail gas into a drying chamber, utilizing the residual heat from the combustion of the yellow phosphorus tail gas to dry the pellets.
[0007] This solution, which couples a yellow phosphorus tail gas boiler with a pellet drying device, achieves the dual utilization of yellow phosphorus tail gas. The yellow phosphorus tail gas is burned as fuel to generate electricity using high-temperature, high-pressure steam. Since the tail gas still contains considerable high-temperature waste heat, this waste heat is used as a heat source to dry the pellets. Pellets are a basic raw material in many industrial sectors, with large production volumes and high drying requirements, thus absorbing a significant amount of waste heat from the yellow phosphorus tail gas. Through this solution, yellow phosphorus tail gas achieves a dual function as both fuel and heat source, effectively improving its utilization rate and fully realizing its resource utilization.
[0008] Furthermore, a third air duct is connected in parallel to the second air duct. The air inlet of the third air duct is connected to the first air duct and is equipped with a bypass damper. A spray cooling device is installed inside the third air duct, and a cooling damper is installed at the air outlet of the third air duct. Control dampers are installed on both sides of the induced draft fan of the first air duct, and a front damper is installed at the front end of the second air duct. When pelletizing ore is not being produced, drying of yellow phosphorus tail gas is not required; therefore, the yellow phosphorus tail gas can be introduced into the third air duct, cooled by spraying, and then sent to the existing desulfurization system for tail gas treatment before being discharged.
[0009] Furthermore, the first duct is also connected in parallel to a backup duct, which contains a backup induced draft fan. By setting up a backup line, the failure of one induced draft fan can prevent the entire device from becoming inoperable, thus ensuring the normal operation of the device.
[0010] Furthermore, the third air duct is also connected to a yellow phosphorus tail gas burner, the outlet of which is connected between the front damper and the blower. By installing the yellow phosphorus tail gas burner, the heat generated by burning the yellow phosphorus tail gas can be directly used to dry the pellet ore when the boiler is not used for power generation.
[0011] Furthermore, the flue gas temperatures at the outlets of the steam boiler and the yellow phosphorus tail gas burner are both above 300°C. By controlling the outlet temperatures of the boiler and the yellow phosphorus tail gas burner and maintaining them at high temperatures, the tail gas will liquefy. This prevents the phosphorus oxide in the combusted tail gas from easily coming into contact with water vapor to form phosphoric acid, which would then corrode the equipment, thus ensuring the service life of the steam boiler and the yellow phosphorus tail gas burner. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of an embodiment of the present utility model.
[0013] The reference numerals in the accompanying drawings include: steam boiler 1, first air duct 2, induced draft fan 21, standby air duct 22, control gate 23, second air duct 3, blower 31, front gate 32, drying box 4, dust collector 5, desulfurization fan 6, desulfurization system 8, third air duct 9, spray cooling device 91, bypass gate 92, cooling gate 93, and yellow phosphorus tail gas burner 10. Detailed Implementation
[0014] The following detailed description illustrates the specific implementation method:
[0015] As attached Figure 1 The diagram shows a yellow phosphorus tail gas boiler coupled with a pellet drying device, comprising a steam boiler 1, an induced draft fan 21, a blower 31, a pellet drying box 4, and a dust collector 5 arranged sequentially along the tail gas flow direction. The steam outlet of the steam boiler 1 is connected to a steam turbine. The induced draft fan 21 is located inside a first duct 2, and the blower 31 is located inside a second duct 3. Both ends of the first duct 2 are connected to the exhaust port of the steam boiler 1 and the air inlet of the second duct 3, respectively. The air outlet of the second duct 3 is connected to the air inlet of the pellet drying box 4, and the air outlet of the pellet drying box 4 is connected to the dust collector 5. A desulfurization fan 6 is also provided after the dust collector 5, which introduces the dust-removed tail gas into an existing desulfurization system 8 for desulfurization. A backup duct 22 is also connected in parallel to the first duct 2, and a backup induced draft fan 21 is installed in the backup duct 22. By setting up a backup line, the failure of one induced draft fan 21 prevents the entire device from failing, ensuring the normal operation of the device.
[0016] The second air duct 3 is connected in parallel to the third air duct 9. The air inlet of the third air duct 9 is connected to the first air duct 2 and is equipped with a bypass damper 92. The third air duct 9 is equipped with a spray cooling device 91, and the air outlet of the third air duct 9 is equipped with a cooling damper 93. The first air duct 2 has control dampers 23 on both sides of the induced draft fan 21, and the second air duct 3 has a front damper 32 at the front end. When no pellet production is being carried out, the yellow phosphorus tail gas does not need to be dried; therefore, the yellow phosphorus tail gas can be introduced into the third air duct 9, cooled by spray, and then sent to the existing desulfurization system 8 for tail gas treatment before being discharged. The third air duct 9 is also connected to a yellow phosphorus tail gas burner 10, and the outlet of the yellow phosphorus tail gas burner 10 is connected between the front damper 32 and the blower 31. By setting up the yellow phosphorus tail gas burner 10, when the boiler is not used for power generation, the heat generated by the combustion of yellow phosphorus tail gas can be directly used to dry the pellets.
[0017] The flue gas temperatures at the outlets of both the steam boiler 1 and the yellow phosphorus tail gas burner 10 are above 300℃. By controlling the outlet temperatures of the boiler and the yellow phosphorus tail gas burner 10 and maintaining them at high temperatures, the tail gas will liquefy. This prevents the phosphorus oxide in the combusted tail gas from easily coming into contact with water vapor to form phosphoric acid, which would then corrode the equipment. This ensures the service life of the steam boiler 1 and the yellow phosphorus tail gas burner 10.
[0018] The yellow phosphorus tail gas is utilized in a steam boiler 1. The heat released from the combustion of the yellow phosphorus tail gas in the boiler 1 furnace heats water into steam with a certain pressure and temperature. The high-temperature, high-pressure steam, generated from the boiler 1, enters the turbine. The steam expands and performs work within the turbine, driving its rotor. The turbine rotor is connected to the generator rotor via a coupling, thus generating electricity. This utilizes the yellow phosphorus tail gas as fuel for power generation, reducing the factory's electricity load and saving on production costs. Secondly, the high-temperature yellow phosphorus tail gas, after combustion, enters the second duct 3 through the induced draft fan 21 in the first duct 2, and then enters the pellet production line. The blower 31 sends the high-temperature yellow phosphorus tail gas into the drying box 4, where the residual heat from the combustion of the yellow phosphorus tail gas is used to dry the pellets.
[0019] This solution, which couples a yellow phosphorus tail gas boiler with a pellet drying device, achieves the dual utilization of yellow phosphorus tail gas. The yellow phosphorus tail gas is burned as fuel to generate electricity using high-temperature, high-pressure steam. Since the tail gas still contains considerable high-temperature waste heat, this waste heat is used as a heat source to dry the pellets. Pellets are a basic raw material in many industrial sectors, with large production volumes and high drying requirements, thus absorbing a significant amount of waste heat from the yellow phosphorus tail gas. Through this solution, yellow phosphorus tail gas achieves a dual function as both fuel and heat source, effectively improving its utilization rate and fully realizing its resource utilization.
[0020] The above descriptions are merely embodiments of this utility model, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application shall be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A yellow phosphorus tail gas boiler coupled with pellet drying device, characterized in that: The system includes a steam boiler, an induced draft fan, a blower, a pellet ore drying box, and a dust collector arranged sequentially along the exhaust gas direction. The steam boiler's steam outlet is connected to a steam turbine. The induced draft fan is located inside a first duct, and the blower is located inside a second duct. The two ends of the first duct are connected to the exhaust port of the steam boiler and the air inlet of the second duct, respectively. The air outlet of the second duct is connected to the air inlet of the pellet ore drying box, and the air outlet of the pellet ore drying box is connected to the dust collector.
2. The yellow phosphorus tail gas boiler coupled with pellet drying device according to claim 1, characterized in that: The second air duct is connected in parallel with the third air duct. The air inlet of the third air duct is connected to the first air duct and is equipped with a bypass gate. The third air duct is equipped with a spray cooling device. The air outlet of the third air duct is equipped with a cooling gate. The first air duct has control gates on both sides of the induced draft fan. The front end of the second air duct is equipped with a front gate.
3. The yellow phosphorus tail gas boiler coupled with pellet drying device according to claim 1, characterized in that: The first duct is also connected in parallel to a backup duct, which is equipped with a backup induced draft fan.
4. The yellow phosphorus tail gas boiler coupled with pellet drying device according to claim 2, characterized in that: The third duct is also connected to a yellow phosphorus tail gas burner, and the outlet of the yellow phosphorus tail gas burner is connected between the front damper and the blower.
5. The yellow phosphorus tail gas boiler coupled with pellet drying device according to claim 4, characterized in that: The flue gas temperatures at the steam boiler outlet and the yellow phosphorus tail gas burner outlet are both above 300°C.