Wind heating equipment based on waste water energy recovery

Abstract

The utility model discloses wind heating equipment based on waste water energy recovery. The air heating equipment comprises an electric heating pipeline and a steam-water heating pipeline, the electric heating pipeline and the steam-water heating pipeline are arranged in parallel, the steam-water heating pipeline comprises a steam heat exchanger, a drainage heat exchanger and a water conveying pipeline, and the water conveying pipeline is used for conveying a drainage heat source to the steam heat exchanger and the drainage heat exchanger. The drainage heat exchanger and the steam heat exchanger are arranged in series so as to be sequentially used for heating air input by the draught fan. According to the wind heating equipment, heat of waste hydrophobic water is effectively utilized to heat wind to be heated, waste water energy recovery is achieved, meanwhile, power consumption is reduced, and the utilization efficiency of a heat source and environmental protection benefits are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of energy-saving and environmental protection equipment, and specifically relates to a wind heating device based on wastewater energy recovery. Background Art

[0002] The current dust removal system of coal-fired power generation units is equipped with an electrostatic dust removal device and a wet electrostatic dust removal device. Among them, the ash hopper gasification fan of the electrostatic dust removal device is equipped with a gasification wind electric heater to heat the gasification wind, and the daily power consumption is more than 1080kWh. The wet electrostatic precipitator is equipped with a sweeping wind electric heater to heat the wet electric seal sweeping air, and the daily power consumption is more than 1200kWh. The power consumption of both dust removal devices is relatively large. In addition, the bottom of the boiler ash hopper in the coal-fired power generation unit is heated by auxiliary steam, with a gas consumption of 1t / h, and the generated water is directly discharged into the unit drainage trough; the flue gas denitrification device in the coal-fired power generation unit adopts a selective catalytic reduction process, and the reducing agent is ammonia vapor produced by urea hydrolysis. The dilution air is heated by steam, and the steam consumption is about 0.8t / h. The water generated by the dilution air heater is directly discharged into the drainage trough. The temperature of these two types of drains is 150°C, and the total annual discharge of drains is about 20,000 tons (enthalpy value > 632.4 kJ / kg). The high-energy drain is directly discharged into the unit drain tank, resulting in a large waste of energy and working fluid.

[0003] Therefore, how to reduce the power consumption of dust removal equipment and effectively utilize high-energy hydrophobicity is a problem to be solved in this field. Utility Model Content

[0004] The technical problem solved by the utility model is: how to reduce the power consumption of dust removal equipment and effectively utilize high-energy hydrophobicity.

[0005] The present application discloses a wind heating device based on wastewater energy recovery, wherein the wind heating device comprises an electric heating pipeline and a steam-water heating pipeline, wherein the electric heating pipeline and the steam-water heating pipeline are arranged in parallel, wherein the steam-water heating pipeline comprises a steam heat exchanger, a drain heat exchanger and a water supply pipeline, wherein the water supply pipeline is used to transport a drain heat source to the steam heat exchanger and the drain heat exchanger, wherein the drain heat exchanger and the steam heat exchanger are arranged in series to heat the wind input by the fan in turn.

[0006] Optionally, the water supply pipeline includes a water inlet pipe, a first diverter and a second diverter, the first diverter connects the water inlet pipe, the air inlet end of the steam heat exchanger and the water inlet end of the drain heat exchanger, and the second diverter connects the air outlet end of the steam heat exchanger and the water inlet end of the drain heat exchanger.

[0007] Optionally, a heater inlet regulating valve is provided on the water inlet pipe.

[0008] Optionally, the water delivery pipeline further includes a drain pipe, a steam trap and a mixer, the drain pipe connects the water outlet end of the steam trap heat exchanger and the mixer, and the steam trap connects the second diverter and the mixer.

[0009] Optionally, the water outlet of the mixer is connected to the urea zone drain tank or the desulfurization slurry forepool.

[0010] Optionally, the drain pipe is also provided with a heater outlet regulating valve.

[0011] Optionally, the steam-water heating pipeline further comprises a heat exchange cavity having an air inlet and an air outlet, and the steam heat exchanger and the hydrophobic heat exchanger are arranged in the heat exchange cavity at intervals.

[0012] Optionally, the air inlet, the drain heat exchanger, the steam heat exchanger, and the air outlet are distributed in sequence from bottom to top.

[0013] The utility model discloses a wind heating device based on wastewater energy recovery, which has the following technical effects:

[0014] The heating equipment effectively utilizes the heat of waste drain to heat the wind to be heated, realizing wastewater energy recovery, while reducing power consumption, improving the utilization efficiency of heat sources and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of a wind heating device based on wastewater energy recovery according to the first embodiment of the utility model.

[0016] The corresponding relationship between the reference numerals and the component names is as follows:

[0017] 10-electric heating pipeline, 11-electric heater, 12-second air inlet pipe, 13-second air outlet pipe, 14-second air duct butterfly valve, 20-steam-water heating pipeline, 21-steam heat exchanger, 22-drain heat exchanger, 23-water inlet pipe, 23a-heater inlet regulating valve, 24-first diverter, 25-second diverter, 26-drain pipe, 27-drain trap, 28-mixer, 29-heat exchange cavity, 29a-air inlet, 29b-air outlet, 201-first air inlet pipe, 202-first air outlet pipe, 203-first air duct butterfly valve, 30-fan. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0019] Before describing in detail the various embodiments of the present application, the technical concept of the present application is briefly described first: in the current coal-fired power generation units, on the one hand, the dust removal equipment needs to consume a large amount of electricity to heat the wind, and on the other hand, the high-heat hydrophobicity generated during the generation process is directly discharged, resulting in a large waste of energy and working fluid. To this end, the present application provides a wind heating device based on wastewater energy recovery, in which an electric heating pipeline and a steam-water heating pipeline are arranged in parallel, wherein the steam heat exchanger and the hydrophobic heat exchanger on the steam-water heating pipeline use the hydrophobic heat source generated during the operation of other equipment as a heat source to heat the wind input by the fan, which can realize wastewater heat recovery on the one hand, and can heat the wind based on the recovered heat on the other hand, reducing the power consumption of the electric heater. The specific principle of the wind heating device based on wastewater energy recovery of the present application is described below in combination with more embodiments.

[0020] Specifically, Figure 1 As shown, the wind heating device based on wastewater energy recovery in this embodiment 1 includes an electric heating pipeline 10 and a steam-water heating pipeline 20, which are arranged in parallel. The steam-water heating pipeline 20 includes a steam heat exchanger 21, a drain heat exchanger 22 and a water pipeline, and the water pipeline is used to transport the drain heat source to the steam heat exchanger 21 and the drain heat exchanger 22. The drain heat exchanger 22 and the steam heat exchanger 21 are arranged in series to heat the wind input by the fan 30 in sequence. Among them, the electric heating pipeline 10 and the steam-water heating pipeline 20 are standby for each other, and the steam-water heating pipeline 20 is used to heat the wind first. When the drain heat source is insufficient, the electric heating pipeline 10 can be started for heating.

[0021] In one embodiment, the water delivery pipeline includes a water inlet pipe 23, a first diverter 24, and a second diverter 25. The first diverter 24 connects the water inlet pipe 23, the air inlet end of the steam heat exchanger 21, and the water inlet end of the drain heat exchanger 22. The second diverter 25 connects the air outlet end of the steam heat exchanger 21 and the water inlet end of the drain heat exchanger 22. The first diverter 24 and the second diverter 25 are both three-way structures. After the water inlet pipe 23 transports the drain heat source to the first diverter 24, the steam of the drain heat source enters the steam heat exchanger 21, and the hot water of the drain heat source enters the drain heat exchanger 22. After the steam heat exchanger 21 exchanges heat with the wind, part of the steam in the steam heat exchanger 21 forms hot water, and enters the drain heat exchanger 22 through the second diverter 25, so that the energy can be recycled in stages. The water inlet pipe 23 is provided with a heater inlet regulating valve 23a, which can timely adjust the on / off and flow rate of the hydrophobic heat source. The hydrophobic heat source can be saturated steam, hydrophobic or a steam-water mixture, for example, a steam-water mixture heated by the ash hopper, or hydrophobic produced by a denitrification dilution air heater.

[0022] Furthermore, the water pipeline also includes a drain pipe 26, a steam trap 27 and a mixer 28, the drain pipe 26 connects the water outlet of the steam heat exchanger 22 and the mixer 28, and the steam trap 27 connects the second diverter 25 and the mixer 28. After heat exchange, part of the steam from the steam heat exchanger 21 is processed by the steam trap 27 to form hot water, which can be further utilized. Among them, the hot water discharged from the water outlet of the steam heat exchanger 22 and the hot water formed by the steam trap 27 can be input into the mixer 28, and the hot water of different temperatures is mixed to form hot water with uniform temperature, so as to further realize the comprehensive utilization of tail water. Exemplarily, the water outlet of the mixer 28 is connected to the urea zone steam trap, that is, the mixed hot water can be used for the preparation of urea solution. For example, the water outlet of the mixer 28 can also be connected to the desulfurization slurry forepool, that is, the mixed hot water can be used to supplement the desulfurization slurry. The drain pipe 26 is also provided with a heater outlet regulating valve 26a, which adjusts the flow rate of hot water at the outlet of the steam trap heat exchanger 22, thereby adjusting the flow rate and temperature of hot water in the mixer 28. Since the temperatures of the hot water discharged from the steam trap heat exchanger 22 and the steam trap 27 are different, the temperature of the mixed hot water can be adjusted by the flow rate of one of the hot waters.

[0023] Furthermore, the steam-water heating pipeline 20 also includes a heat exchange cavity 29, and the heat exchange cavity 29 has an air inlet 29a and an air outlet 29b, and the steam heat exchanger 21 and the hydrophobic heat exchanger 22 are arranged in the heat exchange cavity 29 at intervals. Exemplarily, the air inlet 29a, the hydrophobic heat exchanger 22, the steam heat exchanger 21, and the air outlet 29b are distributed from bottom to top. After the wind generated by the fan enters the air inlet 29a, it is heated by the hydrophobic heat exchanger 22 and the steam heat exchanger 21 in sequence, and finally discharged from the air outlet 29b. Among them, the temperature of the steam heat exchanger 21 is higher than that of the hydrophobic heat exchanger 22. The hydrophobic heat exchanger 22 with a lower temperature can be used to heat the wind, and then the steam heat exchanger 21 with a higher temperature can be used to further heat it to achieve gradient heating.

[0024] Further, the steam-water heating pipeline 20 also includes a first air inlet pipe 201 and a first air outlet pipe 202, the first air inlet pipe 201 is connected to the fan 30 and the air inlet 29a, the first air outlet pipe 202 is connected to the air outlet 29b, and the first air inlet pipe 201 and the first air outlet pipe 202 are both installed with a first air duct butterfly valve 203, and the first air duct butterfly valve 203 is used to adjust the ventilation volume in the steam-water heating pipeline 20. The electric heating pipeline 10 includes an electric heater 11, a second air inlet pipe 12 and a second air outlet pipe 13, the second air inlet pipe 12 is connected to the fan 30 and the electric heater 11, one end of the second air outlet pipe 13 is connected to the electric heater 11, and the other end is merged with the first air outlet pipe 202, and the second air inlet pipe 12 and the second air outlet pipe 13 are both installed with a second air duct butterfly valve 14, and the second air duct butterfly valve 14 is used to adjust the ventilation volume of the electric heating pipeline 10. By controlling the on / off of the first air duct butterfly valve 203 and the second air duct butterfly valve 14, the wind generated by the fan 30 can selectively enter the electric heating pipeline 10 and the steam-water heating pipeline 20, thereby realizing pipeline switching.

[0025] The wind heating device based on wastewater energy recovery disclosed in this embodiment effectively utilizes the heat of waste drain to heat the wind to be heated, thereby realizing wastewater energy recovery, while reducing power consumption, and improving the utilization efficiency of heat sources and environmental benefits.

[0026] The specific implementation methods of the present invention are described in detail above. Although some embodiments have been shown and described, those skilled in the art should understand that these embodiments can be modified and improved without departing from the principle and spirit of the present invention whose scope is defined by the claims and their equivalents. These modifications and improvements should also be within the scope of protection of the present invention.

Claims

1. A wind heating device based on wastewater energy recovery, characterized in that: The wind heating equipment includes an electric heating pipeline and a steam-water heating pipeline, the electric heating pipeline and the steam-water heating pipeline are arranged in parallel, the steam-water heating pipeline includes a steam heat exchanger, a drain heat exchanger and a water supply pipeline, the water supply pipeline is used to transport the drain heat source to the steam heat exchanger and the drain heat exchanger, the drain heat exchanger and the steam heat exchanger are arranged in series to heat the wind input by the fan in turn.

2. The wind heating device based on wastewater energy recovery according to claim 1 is characterized in that: The water delivery pipeline includes a water inlet pipe, a first diverter and a second diverter. The first diverter connects the water inlet pipe, the air inlet end of the steam heat exchanger and the water inlet end of the drain heat exchanger. The second diverter connects the air outlet end of the steam heat exchanger and the water inlet end of the drain heat exchanger.

3. The wind heating device based on wastewater energy recovery according to claim 2 is characterized in that: The water inlet pipe is provided with a heater inlet regulating valve.

4. The wind heating device based on wastewater energy recovery according to claim 3 is characterized in that: The water delivery pipeline also includes a drain pipe, a steam trap and a mixer. The drain pipe is connected to the water outlet end of the steam trap heat exchanger and the mixer. The steam trap is connected to the second diverter and the mixer.

5. The wind heating device based on wastewater energy recovery according to claim 4 is characterized in that: The water outlet of the mixer is connected to the urea zone drain tank or the desulfurization slurry forepool.

6. The wind heating device based on wastewater energy recovery according to claim 4 is characterized in that: The drain pipe is also provided with a heater outlet regulating valve.

7. The wind heating device based on wastewater energy recovery according to claim 1 is characterized in that: The steam-water heating pipeline further comprises a heat exchange cavity having an air inlet and an air outlet. The steam heat exchanger and the hydrophobic heat exchanger are arranged in the heat exchange cavity at intervals.

8. The wind heating device based on wastewater energy recovery according to claim 7 is characterized in that: The air inlet, the drain heat exchanger, the steam heat exchanger, and the air outlet are distributed in sequence from bottom to top.

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