Industrial flue gas condensation recycling technology verification system
By designing an industrial flue gas condensation recovery and utilization technology verification system, the problem that the existing technology cannot accurately obtain the flue gas condensation recovery efficiency under actual operating conditions is solved, and efficient recovery of flue gas waste heat and environmental protection are achieved.
Patent Information
- Application Number
- CN202422668835.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-10-10
- Estimated Expiration
- 2034-11-01
AI Technical Summary
The existing technology cannot accurately obtain the flue gas condensation recovery efficiency under actual operating conditions, and cannot guide the adjustment of parameters such as flow rate and heat exchange equipment during the industrial flue gas condensation recovery process.
A verification system for industrial flue gas condensation recovery and utilization technology is designed, including components such as an air-water heat exchanger and an air-liquid separation tank. By setting sensors and valves, heat exchange tests between flue gas, water, and air are performed, and the condensation efficiency and recovery rate are measured to generate condensed water for reuse.
The test and verification of the flue gas condensation recovery efficiency under actual operating conditions was achieved, which guided the parameter adjustment, improved the flue gas waste heat recovery efficiency, and reduced environmental pollution and operating costs.
Smart Images
Figure CN223426285U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of flue gas recovery and utilization, in particular to an industrial flue gas condensation recovery and utilization technology verification system. Background Art
[0002] In recent years, energy consumption from various industrial furnaces in my country has accounted for over 35% of the nation's total industrial energy consumption, with a significant amount of waste heat remaining unutilized. For example, in the metallurgical industry, utilizable waste heat accounts for approximately one-third of fuel consumption, in the building materials industry for approximately 40%, in the machinery manufacturing industry for approximately 15%, in the chemical, glass, and sugar and porcelain industries for over 15%, in the paper and wood industries for 17%, and in the textile industry for approximately 10%. Recycling this high-temperature flue gas waste heat could yield significant economic and environmental benefits.
[0003] Flue gas condensation recovery technology can recover heat from flue gas, improving energy efficiency, reducing environmental pollution, and saving operating costs. Flue gas condensation recovery is widely used in industry, and process simulation has verified the feasibility of the technology based on design data. However, due to the different types of heat exchangers used in actual flue gas condensation recovery processes, the plate corrugation characteristics of different heat exchangers, the temperature and flow of the cooling source, and the air temperature in different regions, it is impossible to accurately determine the flue gas condensation recovery efficiency under actual operating conditions. Utility Model Content
[0004] The purpose of the utility model is to provide an industrial flue gas condensation recovery and utilization technology verification system, which can measure the flue gas condensation recovery efficiency under actual operating conditions.
[0005] The technical solution of this utility model:
[0006] An industrial flue gas condensation recovery and utilization technology verification system includes an air-water heat exchanger and an air-liquid separation tank. The air-water heat exchanger flue gas side inlet is connected to the flue gas inlet pipe, the air-water heat exchanger flue gas side outlet is connected to the first flue gas outlet pipe, the first flue gas outlet pipe is connected to the flue gas inlet of the gas-liquid separation tank, the flue gas outlet of the gas-liquid separation tank is connected to the second flue gas outlet pipe, the condensate outlet of the gas-liquid separation tank is connected to the condensate outlet pipe, the flue gas inlet pipe is equipped with a flue gas induced draft fan, a flue gas regulating valve, a flue gas thermal mass flowmeter, a flue gas inlet pressure sensor, and a flue gas inlet temperature sensor, and the first flue gas outlet pipe is equipped with a flue gas outlet temperature sensor. , a flue gas outlet pressure sensor, the second flue gas outlet pipe is equipped with an external flue gas flow control valve, an external flue gas mass flowmeter, and an external flue gas temperature sensor, the condensate outlet pipe is equipped with a condensate outlet temperature sensor, a condensate outlet flowmeter, and a condensate pump, the water side inlet of the air-water heat exchanger is connected to the circulating water inlet pipe, the water side outlet of the air-water heat exchanger is connected to the circulating water outlet pipe, the circulating water inlet pipe is equipped with a circulating water inlet pressure sensor, a circulating water inlet temperature sensor, and a circulating water inlet flowmeter, the circulating water outlet pipe is equipped with a circulating water outlet electric regulating valve, a circulating water outlet temperature sensor, and a circulating water outlet pressure sensor.
[0007] Beneficial effects of the utility model:
[0008] 1. The industrial flue gas condensation recovery technology verification system provided in this application utilizes flue gas-circulating cooling water and / or flue gas-air heat exchange to test flue gas condensation recovery efficiency-related data (heat exchanger heat load, flue gas side temperature drop and pressure drop, flue gas condensation efficiency, recovery rate, and heat transfer coefficient), thereby achieving the recovery of evaporated water from flue gas. Testing the flue gas condensation recovery efficiency can guide personnel in adjusting parameters such as flow rate and heat exchange equipment based on actual regional conditions to achieve optimal flue gas waste heat recovery.
[0009] 2. The industrial flue gas condensation recovery and utilization technology verification system provided in this application can exchange heat with water and air separately / separately through air-to-water heat exchangers and air-to-air heat exchangers. After the heat exchange, most of the water carried inside is condensed, and the water content in the remaining exhaust gas is greatly reduced, which can be returned to the drying system for reuse.
[0010] 3. The condensed water formed by condensation in this application can be collected in a condensate tank and used as fresh water.
[0011] 4. The air after heat exchange in this application is heated up and becomes hot air, which can provide combustion-supporting hot air for the drying system. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.
[0013] Figure 1 This is a schematic diagram of the industrial process of the flue gas recovery and utilization technology verification test system for this application.
[0014] Reference numerals:
[0015] 1. Flue gas induced draft fan; 2. Flue gas regulating valve; 3. Flue gas thermal mass flowmeter; 4. Flue gas inlet pressure sensor; 5. Flue gas inlet temperature sensor; 6. Air-water heat exchanger; 7. Circulating water outlet electric regulating valve; 8. Circulating water outlet temperature sensor; 9. Circulating water outlet pressure sensor; 10. Circulating water inlet and outlet shut-off valves; 11. Circulating water inlet pressure sensor; 12. Circulating water inlet temperature sensor; 13. Circulating water inlet flowmeter; 14. Air-air heat exchanger; 15. Hot air outlet electric regulating valve; 16. Hot air outlet temperature sensor; 17. Hot air outlet pressure sensor; 18. Hot air outlet shut-off valve; 19. Air induced draft fan; 20. Air inlet pressure sensor; 21. Air inlet temperature sensor; 22. Air mass flowmeter; 23. Flue gas inlet / outlet valve on the air-air heat exchanger 101. Flue gas inlet pipe; 102. First flue gas outlet pipe; 103. Flue gas inlet; 104. Flue gas outlet; 105. Condensate outlet; 106. Condensate outlet pipe; 107. Second flue gas outlet pipe; 201. Circulating water outlet pipe; 202. Circulating water inlet pipe; 203. Hot air outlet pipe; 204. Air inlet pipe. DETAILED DESCRIPTION
[0016] To address the issues raised in the background art, the present invention has developed a system for verifying the condensation and recycling of industrial flue gas. This system condenses the flue gas from industrial plants through water cooling and / or air cooling, and verifies the recovery effect by adjusting the post-condensation temperature to facilitate rational design in industrial plants.
[0017] The specific implementation methods of the present invention are described in detail below. It should be noted that, in the description of the present invention, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.
[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.
[0019] Please refer to the attached Figure 1 The present invention provides a flue gas recovery and utilization technology verification test system, which includes a flue gas induced draft fan 1, an air-water heat exchanger 6, an air-air heat exchanger 14, an air induced draft fan 19, and a gas-liquid separation tank 32. The air-water heat exchanger 6 and the air-air heat exchanger 14 are connected in parallel via pipes on the flue gas side. The inlet and outlet of the air-water heat exchanger 6 are provided with an air-water heat exchanger flue gas side inlet / outlet shut-off valve 24, and the inlet and outlet of the air-air heat exchanger 14 are provided with an air-air heat exchanger flue gas side inlet / outlet shut-off valve 23.
[0020] The gas-water heat exchanger 6 and the gas-gas heat exchanger 14 can realize heat exchange of flue gas with water and air at the same time, and the flue gas can also be heat exchanged with water and air alone, the flue gas condensation efficiency under different condensation states is tested, the flue gas inlet pipeline 101 can enter the gas-water heat exchanger 6 and the gas-gas heat exchanger 14 respectively through the flue gas induced draft fan 1, the flue gas adjusting valve 2, the flue gas thermal mass flow meter 3, the flue gas inlet pressure sensor 4 and the flue gas inlet temperature sensor 5 are arranged on the flue gas inlet pipeline 101 respectively, the flue gas outlet first pipeline 102 is connected with the flue gas inlet 103 of the gas-liquid separation tank 32, the flue gas outlet temperature sensor 25 and the flue gas outlet pressure sensor 26 are arranged on the flue gas outlet first pipeline 102, the flue gas outlet 104 is arranged on the upper end of the gas-liquid separation tank 32, the flue gas outlet 104 is connected with the flue gas outlet second pipeline 107, the exhaust flue gas flow control valve 27, the exhaust flue gas mass flow meter 28 and the exhaust flue gas temperature sensor 29 are arranged on the flue gas outlet second pipeline 107, the flue gas humidity detector 30 and the flue gas component analyzer 31 are also arranged on the upper end of the gas-liquid separation tank 32 respectively, and the liquid level sensor 36 is arranged on the left side, the condensate outlet 105 is arranged on the lower end of the gas-liquid separation tank 32, the condensate outlet 105 is connected with the condensate outlet pipeline 106, the condensate outlet temperature sensor 33, the condensate outlet flow meter 34 and the condensate pump 35 are arranged on the condensate outlet pipeline 106.
[0021] The gas-water heat exchanger 6 forms a circulating loop through the circulating water inlet pipeline 202 and the circulating water outlet pipeline 201, the circulating water inlet pipeline 202 and the circulating water outlet pipeline 201 are respectively provided with circulating water inlet and outlet shutoff valves 10, circulating water enters the gas-water heat exchanger 6 through the circulating water inlet pipeline 202, and after being heated by the heat exchanger, the circulating water flows out through the circulating water outlet pipeline 201.
[0022] The air-to-air heat exchanger 14 forms a circulation loop on the air side through an air inlet pipe 204 and a hot air outlet pipe 203. The air inlet pipe 204 is connected to an induced draft fan 19, which transports air through the air inlet pipe 204 into the air-to-air heat exchanger 14. After heat exchange and temperature increase, the air is discharged through the hot air outlet pipe 203. The air inlet pipe 204 is equipped with an air inlet pressure sensor 20, an air inlet temperature sensor 21, and an air mass flow meter 22, which can respectively monitor the air temperature, pressure, and flow rate. The hot air outlet pipe 203 is equipped with a hot air outlet electric regulating valve 15, a hot air outlet temperature sensor 16, a hot air outlet pressure sensor 17, and a hot air outlet shut-off valve 18, which can respectively regulate the hot air flow rate, monitor the hot air temperature and pressure, and monitor the resistance of the air-side heat exchanger. The heated hot air can then be sent to the combustion process system for combustion support. Due to the increased temperature of the combustion-supporting air, fuel gas usage can be reduced. The gas-gas heat exchange system can effectively share part of the heat load in the flue gas condensation process, reduce the load of the gas-water heat exchange system, and reduce the amount of circulating cooling water, thereby better saving energy.
[0023] The present invention utilizes two separate heat exchange systems, one for flue gas and circulating water, and the other for flue gas and air, to simultaneously or separately test heat exchange between flue gas and circulating water and air. The flue gas regulating valve 2 regulates flue gas flow, the other for flue gas thermal mass flowmeter 3 monitors flue gas flow, and the other for flue gas inlet pressure sensor 4 and outlet pressure sensor 26 detect flue gas resistance drop data under different condensation conditions. To ensure effective separation of flue gas and condensate after condensation, a gas-liquid separator 32 is installed after the heat exchanger. After the flue gas is cooled and its temperature drops below the dew point, evaporated water carried in the flue gas condenses into liquid condensate. The condensate and flue gas are separated by passing through the first flue gas outlet pipe 102 and the flue gas inlet 103 to the gas-liquid separator 32. The gas-liquid separator 32 is equipped with a liquid level sensor, and the condensate outlet pipe 106 is equipped with a condensate outlet temperature sensor 33, a condensate outlet flowmeter 34, and a condensate pump 35. When the liquid level in the tank reaches a certain height, the condensate pump 35 automatically starts to pump out the condensate for use as fresh water in other equipment or collection. When the liquid level falls below a set value, the pump stops to protect the pump. The condensate outlet temperature sensor 33 and condensate outlet flowmeter 34 monitor the condensate temperature and condensate flow rate. The flue gas inlet temperature sensor 5, flue gas outlet temperature sensor 25, and exhaust gas temperature sensor 29 respectively monitor the hot flue gas temperature, the flue gas temperature after condensation in the heat exchanger, and the flue gas temperature after separation. The exhaust flue gas flow control valve 27 and exhaust flue gas mass flowmeter 28 accurately control and monitor the exhaust flue gas flow rate. The upper end of the gas-liquid separation tank 32 is also provided with a smoke humidity detector 30, and a smoke component analyzer 31 can detect the humidity of the smoke and test the components of the smoke respectively. The smoke component analyzer 31 is powered by a built-in rechargeable lithium battery and can switch the calorific value unit to measure the content of components such as CO, CO2, CH4, N2, O2, and H2.
[0024] Through the flue gas flow (measured by the flue gas thermal mass flowmeter on the flue gas inlet pipe), inlet and outlet temperatures (measured by the flue gas inlet temperature sensor on the flue gas inlet pipe and the flue gas outlet temperature sensor on the first flue gas outlet pipe), circulating water flow (measured by the circulating water inlet flowmeter on the circulating water outlet pipe), inlet and outlet temperatures (measured by the circulating water outlet pipe, the circulating water outlet temperature sensor on the circulating water inlet pipe and the circulating water inlet temperature sensor), air flow (measured by the air mass flowmeter installed on the air inlet pipe), inlet and outlet temperatures (measured by the hot air outlet pipe, the air inlet temperature sensor installed on the air inlet pipe and the hot air outlet temperature sensor). According to the heat transfer equation: Q = K*A*△t mThe heat load of the heat exchanger, the heat exchange coefficient, and the temperature drop of the heat transfer medium under different working conditions can be tested and calculated. Through the measurement of the inlet and outlet pressures of the gas-water heat exchanger and the gas-gas heat exchanger, the pressure drop data of the heat transfer medium can be obtained. By adjusting the different condensing temperatures of the flue gas, combining the moisture data of the industrial fuel, the flue gas flow before and after condensation, and the condensate water recovery amount, the flue gas condensation efficiency and recovery rate effect can be verified and analyzed.
[0025] The above describes the utility model and its embodiments in a schematic manner, which is not restrictive, and the drawings only show one of the embodiments of the utility model, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired thereby, and does not deviate from the technical solution content of the utility model, and designs a similar structure mode and implementation to the above implementation examples according to the technical essence of the utility model without creativity, all should belong to the protection scope of the utility model.
Claims
1. An industrial flue gas condensation recovery and utilization technology verification system, characterized by: It includes an air-water heat exchanger and an air-liquid separation tank. The air-water heat exchanger flue gas inlet is connected to the flue gas inlet pipe, the air-water heat exchanger flue gas outlet is connected to the first flue gas outlet pipe, the first flue gas outlet pipe is connected to the flue gas inlet of the air-liquid separation tank, the flue gas outlet of the air-liquid separation tank is connected to the second flue gas outlet pipe, the condensate outlet of the air-liquid separation tank is connected to the condensate outlet pipe, the flue gas inlet pipe is equipped with a flue gas induced draft fan, a flue gas regulating valve, a flue gas thermal mass flowmeter, a flue gas inlet pressure sensor, and a flue gas inlet temperature sensor, the first flue gas outlet pipe is equipped with a flue gas outlet temperature sensor, a flue gas outlet pressure sensor, and a flue gas outlet pressure sensor. The second flue gas outlet pipe is equipped with an external flue gas flow control valve, an external flue gas mass flowmeter, and an external flue gas temperature sensor; the condensate outlet pipe is equipped with a condensate outlet temperature sensor, a condensate outlet flowmeter, and a condensate pump; the water side inlet of the air-water heat exchanger is connected to the circulating water inlet pipe, and the water side outlet of the air-water heat exchanger is connected to the circulating water outlet pipe; the circulating water inlet pipe is equipped with a circulating water inlet pressure sensor, a circulating water inlet temperature sensor, and a circulating water inlet flowmeter; the circulating water outlet pipe is equipped with a circulating water outlet electric regulating valve, a circulating water outlet temperature sensor, and a circulating water outlet pressure sensor.
2. The industrial flue gas condensation recovery and utilization technology verification system according to claim 1 is characterized in that: It also includes an air-to-air heat exchanger, which is arranged in parallel with the air-to-water heat exchanger. The smoke gas side inlet of the air-to-air heat exchanger is connected to the smoke gas inlet pipe, and the smoke gas side outlet is connected to the first smoke gas outlet pipe. The air side inlet of the air-to-air heat exchanger is connected to the air inlet pipe, and the air side outlet is connected to the air outlet pipe. The air inlet pipe is equipped with an air induced draft fan, an air inlet pressure sensor, an air inlet temperature sensor, and an air mass flow meter. The air outlet pipe is equipped with a hot air outlet electric regulating valve, a hot air outlet temperature sensor, a hot air outlet pressure sensor, and a hot air outlet shut-off valve.
3. The industrial flue gas condensation recovery and utilization technology verification system according to claim 1 is characterized in that: The gas-liquid separation tank is equipped with a smoke humidity detector, a smoke component analyzer and a liquid level sensor.
4. The industrial flue gas condensation recovery and utilization technology verification system according to claim 1 is characterized in that: The flue gas inlet and outlet of the air-water heat exchanger are equipped with air-water heat exchanger flue gas inlet / outlet shut-off valves, and the water side circulating water outlet pipe and circulating water inlet pipe of the air-water heat exchanger are equipped with circulating water inlet and outlet shut-off valves.
5. The industrial flue gas condensation recovery and utilization technology verification system according to claim 2 is characterized in that: The flue gas inlet and outlet of the gas-gas heat exchanger are equipped with gas-gas inlet / outlet shut-off valves, and the hot air outlet pipe on the air side of the gas-gas heat exchanger is equipped with a hot air outlet shut-off valve.