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CN-121995986-A - Device for selectively utilizing tail gas heat and accurately controlling temperature

CN121995986ACN 121995986 ACN121995986 ACN 121995986ACN-121995986-A

Abstract

The invention discloses a device for selectively utilizing tail gas heat and accurately controlling temperature, which is arranged between high-temperature tail gas and a gas utilization device and comprises an electric three-way valve, a fan, a real-time monitoring equipment set and an analysis control module, wherein the electric three-way valve is used for shunting the high-temperature tail gas under the control of the analysis control module, the real-time monitoring equipment set comprises a plurality of temperature sensors and flow meters arranged on the device and the gas utilization device, the temperature and flow parameters of the high-temperature gas at different positions are monitored in real time and sent to the analysis control module, and the analysis control module is used for analyzing the flow of the high-temperature gas required to be shunted into the gas utilization device according to the set performance and demand parameters of the gas utilization device and the received real-time temperature and flow parameters and controlling the opening of the electric three-way valve and the fan. The device not only can recycle waste heat, but also can accurately control the air temperature and the available heat of tail gas according to the requirements of an air utilization system, and is simple and clear to operate, and a user only needs to input the required air utilization temperature and air utilization power.

Inventors

  • CHENG HANSONG
  • ZHOU ZONGTUAN
  • YANG YIQING

Assignees

  • 武汉氢阳能源有限公司

Dates

Publication Date
20260508
Application Date
20251229

Claims (10)

  1. 1. The device is characterized by being arranged between high-temperature tail gas and an air utilization device and comprising an electric three-way valve, a fan, a real-time monitoring equipment set and an analysis control module; The electric three-way valve is used for dividing the high-temperature tail gas under the control of the analysis control module, part of the high-temperature tail gas is mixed with the gas fed by the fan and then is fed into the gas utilization device through the first outlet, and the rest of the high-temperature tail gas is discharged through the second outlet; The real-time monitoring equipment set comprises a plurality of temperature sensors and flow meters which are arranged on the device and the gas utilization device, and the temperature and flow parameters of the high-temperature gas at different positions are monitored in real time and sent to the analysis control module; The analysis control module is used for analyzing the flow of the high-temperature gas which needs to be split into the gas utilization device according to the set performance and demand parameters of the gas utilization device and the received real-time temperature and flow parameters, and controlling the opening of the electric three-way valve and the opening of the fan.
  2. 2. The device for selectively utilizing the heat of the tail gas and accurately controlling the temperature according to claim 1, wherein the real-time monitoring equipment set comprises a first flowmeter and a first temperature sensor which are arranged at a first outlet, a second flowmeter and a second temperature sensor which are arranged at an inlet of the gas utilization system, and a third temperature sensor which is arranged at the tail gas discharge position of the gas utilization device.
  3. 3. The device for selectively utilizing tail gas heat and accurately controlling temperature according to claim 1, wherein the analysis control module controls the opening of the electric three-way valve by specifically adopting the following steps: (1) Setting parameters of a gas utilization system, wherein the gas utilization power is Q 0 , the gas utilization temperature is T 0 , then starting a three-way valve, the opening of a first outlet is 15% -25%, simultaneously starting a fan, rotating the fan to 1000 r/min-1500 r/min, acquiring real-time parameters of a real-time monitoring equipment group, and acquiring theoretical flow V Theory of 1 of split flow entering the gas utilization system; (2) The opening degree of the three-way valve is adjusted according to the real-time parameters of the real-time monitoring equipment group, so that the actual flow of the first outlet is close to V Theory of 1 , and meanwhile, the rotating speed of the fan is adjusted, so that the temperature T 2 entering the gas utilization system is close to the set temperature T 0 ; (3) When the machine is stopped, the electric three-way valve is firstly adjusted, the first outlet is closed, and the fan cooling system is closed and powered off after 5 min.
  4. 4. The device for selectively utilizing tail gas heat and accurately controlling temperature according to claim 3, wherein the gas utilization system parameters in the step (1) further comprise a heat dissipation coefficient eta of the gas utilization system, a specific heat C of high-temperature tail gas, a density rho of high-temperature tail gas and a temperature T1 of high-temperature tail gas.
  5. 5. The device for selectively utilizing tail gas heat and precisely controlling temperature according to claim 3, wherein the theoretical flow V Theory of 1 in the step (1) is obtained by adopting formula 1: V1= Q0/(1-η)/( C*ρ*(T1-T3)) (1) wherein Q0 is the power set by the gas utilization system, eta is the heat dissipation coefficient of the system, C is the specific heat of the high-temperature tail gas, rho is the density of the high-temperature tail gas, T1 is the temperature of the high-temperature tail gas, and T3 is the temperature of the high-temperature gas after passing through the gas utilization system; when the formula 1 is adopted, the tail gas of the gas utilization system is connected with the inlet of the fan.
  6. 6. The device for selectively utilizing tail gas heat and precisely controlling temperature according to claim 3, wherein the theoretical flow V Theory of 1 in the step (1) is obtained by adopting formula 2: V0= Q0/(1-η)/( C*ρ*(T0-T3)) (2) wherein Q0 is the power set by the gas utilization system, eta is the heat dissipation coefficient of the system, C is the specific heat of the high-temperature tail gas, rho is the density of the high-temperature tail gas, T0 is the set temperature of the gas utilization system, and T3 is the temperature of the high-temperature gas after passing through the gas utilization system.
  7. 7. The device for selectively utilizing tail gas heat and accurately controlling temperature according to claim 3, wherein the three-way valve opening in the step (2) is adjusted once every 5S-8S, and the opening of the valve in the first outlet direction is increased or decreased by 2% -5% of the opening of the valve, and the device is continuously adjusted, so that the instant flow of the flowmeter is close to the set flow V Theory of 1 .
  8. 8. The device for selectively utilizing tail gas heat and accurately controlling temperature according to claim 3, wherein the fan flow rate in the step (2) is adjusted by adopting every 2S to 5S, the air supply quantity of the fan is continuously adjusted by increasing or decreasing the speed by 2% -5%, and the real-time parameter of the temperature sensor T2 is close to the set temperature T0.
  9. 9. The device for selectively utilizing tail gas heat and accurately controlling temperature according to claim 3, wherein the analysis control module controls the opening of the electric three-way valve further comprises the steps of adjusting the three-way valve once every 5S-8S when the energy per unit mass of high-temperature tail gas is increased, gradually reducing the opening of the first outlet according to the range of 2% -5%, continuously adjusting the opening of the first outlet to enable the actual flow of the first outlet to be close to V Theory of 1 , simultaneously adjusting the rotating speed of the fan once every 2S-5S, increasing or reducing the opening of the electric three-way valve according to the range of 2% -5%, and continuously adjusting the temperature T 2 entering the gas utilization system to be close to the set temperature T 0 .
  10. 10. The device for selectively utilizing tail gas heat and accurately controlling temperature according to claim 3, wherein the analysis control module controls the opening of the electric three-way valve further comprises the steps of adjusting the three-way valve once every 5S-8S when the energy per unit mass of high-temperature gas is reduced, gradually increasing the opening of the first outlet according to the range of 2% -5%, continuously adjusting the opening of the first outlet to enable the actual flow of the first outlet to be close to V Theory of 1 , simultaneously adjusting the rotating speed of the fan once every 2S-5S, increasing or reducing according to the range of 2% -5%, and continuously adjusting the temperature T 2 entering the gas utilization system to be close to the set temperature T 0 .

Description

Device for selectively utilizing tail gas heat and accurately controlling temperature Technical Field The invention belongs to the field of chemical tail gas recovery, and particularly relates to a device for selectively utilizing tail gas heat and accurately controlling temperature. Background Under the drive of policies, the tail gas recycling device of each industry is widely applied. In the chemical industry, the heat pipe technology can recycle 30% -50% of waste gas heat, simultaneously realize solvent condensation ‌, reduce energy consumption by 25% -40% ‌ through waste heat recovery in the textile industry, reduce fuel consumption by 15% -20% ‌ by using kiln tail heat exchange equipment in cement factories, and release ‌ continuously for energy conservation and transformation. And exhibits industry chain synergy and multi-domain penetration tendencies. The performance of the upstream steel and ceramic materials is improved to promote the manufacture of midstream equipment, and the downstream covers the eight fields ‌ such as petrochemical industry, electrowinning and the like. Disclosure of Invention The invention aims at overcoming the defects of the prior art and provides a device capable of precisely controlling the heat and the temperature of the recovered tail gas. In order to achieve the aim, the invention adopts the following technical scheme that the device selectively utilizes the heat of the tail gas and accurately controls the temperature is arranged between the high-temperature tail gas and the gas utilization device and comprises an electric three-way valve, a fan, a real-time monitoring equipment group and an analysis control module; The electric three-way valve is used for dividing the high-temperature tail gas under the control of the analysis control module, part of the high-temperature tail gas is mixed with the gas fed by the fan and then is fed into the gas utilization device through the first outlet, and the rest of the high-temperature tail gas is discharged through the second outlet; The real-time monitoring equipment set comprises a plurality of temperature sensors and flow meters which are arranged on the device and the gas utilization device, and the temperature and flow parameters of the high-temperature gas at different positions are monitored in real time and sent to the analysis control module; The analysis control module is used for analyzing the flow of the high-temperature gas which needs to be split into the gas utilization device according to the set performance and demand parameters of the gas utilization device and the received real-time temperature and flow parameters, and controlling the opening of the electric three-way valve and the opening of the fan. Further, the real-time monitoring equipment group comprises a first flowmeter and a first temperature sensor which are arranged at the first outlet, a second flowmeter and a second temperature sensor which are arranged at the inlet of the gas utilization system, and a third temperature sensor which is arranged at the tail gas emission position of the gas utilization device. Further, the analysis control module controls the opening of the electric three-way valve by adopting the following steps: (1) Setting parameters of a gas utilization system, wherein the gas utilization power is Q 0, the gas utilization temperature is T 0, then starting a three-way valve, the opening of a first outlet is 15% -25%, simultaneously starting a fan, rotating the fan to 1000 r/min-1500 r/min, acquiring real-time parameters of a real-time monitoring equipment group, and acquiring theoretical flow V Theory of 1 of split flow entering the gas utilization system; (2) The opening degree of the three-way valve is adjusted according to the real-time parameters of the real-time monitoring equipment group, so that the actual flow of the first outlet is close to V Theory of 1, and meanwhile, the rotating speed of the fan is adjusted, so that the temperature T 2 entering the gas utilization system is close to the set temperature T 0; (3) When the machine is stopped, the electric three-way valve is firstly adjusted, the first outlet is closed, and the fan cooling system is closed and powered off after 5 min. Further, the parameters of the gas utilization system in the step (1) further comprise a heat dissipation coefficient eta of the gas utilization system, a specific heat C of the high-temperature tail gas, a density rho of the high-temperature tail gas and a temperature T1 of the high-temperature tail gas. Further, the theoretical flow V Theory of 1 in step (1) is obtained using formula 1: V1= Q0/(1-η)/( C*ρ*(T1-T3)) (1) wherein Q0 is the power set by the gas utilization system, eta is the heat dissipation coefficient of the system, C is the specific heat of the high-temperature tail gas, rho is the density of the high-temperature tail gas, T1 is the temperature of the high-temperature tail gas, and T3 is the temperature of the high-temp