Electrostatically driven device for eliminating colored smoke plumes using space charge injection
Through the electrostatic drive device of space charge injection, the design of the fog generating chamber and the water droplet capture chamber is solved, and the problem of high cost of colored smoke plume elimination equipment in the prior art is achieved, achieving a low-cost and efficient smoke plume treatment effect.
Patent Information
- Application Number
- CN201911343189.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-12-24
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2039-12-24
AI Technical Summary
The existing technology consumes high energy, has large initial investment, and is expensive in the elimination of non-ferrous smoke plumes, making it difficult to promote on a large scale, especially when the flue gas temperature is low, it has strong corrosion to the heat exchanger, resulting in equipment maintenance and operation costs. high.
Using the electrostatic drive device with space charge injection, the design of the fog generating chamber and the water droplet capture chamber is carried out, and the flue gas and air are mixed with the inverter fan and the spoiler fan. The ion emitter captures the water droplets under the action of the electric field, and uses the water droplet collection network and the water collection pump. Realize the collection and elimination of water droplets and reduce equipment costs.
It has achieved effective control of non-ferrous smoke plumes under low initial investment and operating costs, reduced dependence on high-cost heat exchangers, and reduced the overall cost of equipment. Prototype tests show that DC power supply is small and suitable for large-scale applications.
Smart Images
Figure CN110976091B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of environmental protection devices, and in particular to a device for eliminating colored smoke plumes by electrostatic drive using space charge injection. Background Art
[0002] At present, the flue gas of most domestic steel, coking, and chemical industries is sprayed or wet desulfurized before being discharged, and the temperature is reduced to 45℃-80℃. At this time, the flue gas is usually saturated wet flue gas, which contains a large amount of water vapor, and the water vapor contains more soluble salts, SO3, gel dust, fine dust, etc. If the flue gas is discharged directly from the chimney and enters the ambient air with a lower temperature, due to the low temperature of the ambient air, when it mixes with the saturated flue gas, the state point is in the fog area. At this time, the water vapor in the flue gas is cooled to form small droplets, which coexist with the flue gas, that is, a wet plume is formed. Therefore, extracting or collecting the liquid water droplets in it has become an effective direction for eliminating or controlling colored plumes.
[0003] In the treatment process of colored smoke plumes, the method of condensation first and then heating is generally adopted. The process flow is to first cool the flue gas to below the saturation temperature through a heat exchanger to condense the water vapor in the flue gas. The condensed flue gas is saturated flue gas, but the moisture content of the flue gas decreases. Then, it is heated by the second-stage heat exchanger. The moisture content of the flue gas remains unchanged, but the relative humidity of the flue gas decreases, and it becomes unsaturated flue gas and is discharged into the atmosphere. After contacting with the air, the state of the mixing point appears outside the "fog zone / supersaturated zone", which can effectively avoid or reduce the formation of colored smoke plumes. This flue gas treatment process can achieve "water-gas" separation, but the energy consumption and initial investment are relatively large. For example, a large amount of high-grade energy is consumed in the cooling and heating of the flue gas. For example, a heat pump is used, and the whole process requires at least two heat exchangers and other auxiliary equipment, and the heat exchanger should have strong corrosion resistance, and the cost is very high. Another treatment method is to directly heat the saturated flue gas to increase the relative humidity of the flue gas so that when the flue gas mixes with the outside air, the mixing point is outside the "fog area / supersaturated area". Obviously, this treatment method can only eliminate the colored smoke plume visually, and does not achieve "water-gas" separation. In addition to consuming part of the high-grade heat source and increasing the investment in ancillary equipment, it cannot achieve the expected environmental protection function.
[0004] As mentioned above, the flue gas involved in the elimination of colored plumes has a low temperature, often below the acid dew point, and is highly corrosive. Whether heating or cooling the flue gas, high requirements are placed on the heat exchangers involved. Currently, fluoroplastic heat exchangers are more commonly used, but they are expensive, have low heat transfer coefficients, and have large on-site installation dimensions. For metal heat exchangers, their heat transfer coefficients are higher than those of fluoroplastic heat exchangers, but due to the low thermal conductivity of the flue gas itself, the cost of the heat exchanger is also relatively high. Taking the Tianjin Jinre Group Heating Station as an example, the heating station has a total of 4 gas boilers. When operating at full load, the flue gas flow rate is 20,000m 3 / h, the temperature is 100℃, the heating station is built in a residential area, and before the heating season, a large amount of colored plumes will form at the end of the flue, causing great trouble to the surrounding residents. The "cooling first, heating later" colored plume elimination process adopted by it is calculated that the required heat exchange area is 700㎡, the material is 304 stainless steel, and the cost of the heat exchanger alone is nearly 300,000 yuan. Therefore, the cost of colored plume elimination equipment has become a "bottleneck" that restricts its large-scale promotion. Summary of the invention
[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned technology and provide a device for eliminating colored smoke plumes by electrostatic drive using space charge injection.
[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an electrostatically driven device for eliminating colored plumes by utilizing space charge injection, characterized in that it includes a mist generating chamber, a water droplet catching chamber, a variable frequency fan, a turbulent fan, a water droplet collecting net, an ion emitter and a collecting water pump; the mist generating chamber and the water droplet catching chamber are connected, the mist generating chamber is provided with a smoke inlet and an ambient air inlet, the variable frequency fan is installed in the ambient air inlet, the fan blades of the turbulent fan are located in the mist generating chamber, and are used to enhance the mixing of smoke and external air. Under the action of the turbulent fan, the smoke and external air are fully mixed and colored plumes appear; the water droplet catching chamber is provided with multiple levels of the water droplet collecting net and the ion emitter; the collecting water pump is connected to the bottom of the mist generating chamber and the water droplet catching chamber respectively through pipelines.
[0007] Preferably, the water droplet collecting net and the ion emitter are made of stainless steel.
[0008] Preferably, the surface of the water droplet collection net is coated with a hydrophobic coating to accelerate the removal of the collected water droplets.
[0009] Preferably, the ion emitter is connected to the negative pole of a DC power supply, the positive pole of the DC power supply is grounded, and the water droplet collection network is grounded.
[0010] Preferably, the voltage of the ion emitter is adjustable.
[0011] Compared with the prior art, the device can achieve the treatment of colored smoke plumes at a lower initial investment and operating cost. The system involved in the present invention does not have a large heat exchanger or heater, which can greatly reduce the cost. During the prototype test, the power consumption of the DC power supply is very small. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 The device structure diagram corresponding to the present invention is
[0013] Figure 2 It is a working principle diagram of the water droplet capture chamber of the present invention.
[0014] In the figure: 1-mist generating chamber; 2-water droplet capturing chamber; 3-smoke inlet; 4-ambient air inlet; 5-mixed gas outlet; 6-variable frequency fan; 7-turbulent fan; 8-water droplet collecting net; 9-ion emitter; 10-ground terminal; 11-DC power supply; 12-temperature and humidity sensor; 13-flow meter; 14-collecting water pump; 15-charged droplets; a-smoke; b-ambient air; c-treated smoke-air mixture; d-water-gas mixture. DETAILED DESCRIPTION
[0015] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.
[0016] like Figure 1-Figure 2 As shown, a device for eliminating colored smoke plumes by electrostatic drive using space charge injection is composed of a mist generating chamber 1, a water droplet capturing chamber 2, a variable frequency fan 6, a turbulent fan 7, a water droplet collecting net 8, an ion emitter 9, a DC power supply 11, a thermal humidity sensor 12, a flow meter 13 and a water collection pump 14. The mist generating chamber is connected to the water droplet capturing chamber, a smoke inlet and an ambient air inlet are provided on the mist generating chamber, the variable frequency fan is installed in the ambient air inlet, and the function of the variable frequency fan 6 is to adjust the flow rate of ambient air entering the mist generating chamber according to the smoke flow rate and state.
[0017] The fan blades of the turbulent fan are located in the mist generating chamber, and are used to strengthen the mixing of the smoke and the outside air. Under the action of the turbulent fan, the smoke and the outside air are fully mixed and a colored smoke plume appears; the water droplet collecting net and the ion emitter are arranged in multiple stages in the water droplet capturing chamber, and are not limited to the attached Figure 1 Two levels in.
[0018] The water collection pump is connected to the bottom of the mist generation chamber and the water droplet capture chamber through pipelines. The colored smoke plume generated by the mist generation chamber enters the water droplet capture chamber 2. In the water droplet capture chamber 2, the water droplets in the mixed gas are injected with net charge by the ion emitter 9. Under the action of the electric field, the charged water droplets 15 move toward the water droplet collection net 8 connected to the ground 10 and are captured. When the droplets grow to a certain size, they fall off under the action of gravity. The liquid water captured by the water droplet collection net 8 is discharged by the water collection pump 14.
[0019] The ion emitter 9 is connected to the negative electrode of the DC power supply 11, and the positive electrode of the DC power supply 11 is grounded. The water droplet collection net 8 is well grounded. The voltage of the ion emitter 9 is adjustable, and the purpose is to adjust the voltage accordingly according to the amount of the colored smoke plume.
[0020] The working process of the present invention is as follows: smoke a enters the mist generating chamber 1 through the smoke inlet 3 , and ambient air b enters the mist generating chamber 1 through the ambient air inlet 4 .
[0021] The flow rate of the ambient air b is controlled by the variable frequency fan 6 , and the control idea is: according to the parameters of the flue gas a measured by the flow meter 13 and the thermometer and hygrometer 12 , the flow rate of the ambient air b is adjusted in real time.
[0022] The smoke a and the ambient air b are mixed in the mist generating chamber 1, and the state point is ensured to be in the supersaturated zone of the mixed gas, producing a "micro water droplet-gas" mixture d, i.e., a colored smoke plume. In order to strengthen the mixing of the smoke a and the ambient air b, a turbulent fan 7 is used for stirring, and then the colored smoke plume enters the water droplet capturing chamber 2.
[0023] In the water droplet capture chamber 2, the water droplets in the mixed gas are injected with net charge by the ion emitter 9. Under the action of the electric field, the charged water droplets 15 move toward the water droplet collection net 8 connected to the ground 10 and are captured. When the droplets grow to a certain size, they fall off under the action of gravity. See the schematic diagram. Figure 2 .
[0024] The ion emitter 9 is connected to the negative electrode of the DC power supply 11, and the positive electrode of the DC power supply 11 is grounded. The dehydrated mixed gas c is discharged into the atmosphere through the outlet 5. It should be noted that according to the flue gas volume, the water content of the flue gas, and the ambient air temperature, a multi-stage water droplet collection net 8 and an ion emitter 9 can be set in the water droplet capture chamber 2, and is not limited to Figure 1 Two levels in.
[0025] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.
Claims
1. An electrostatically driven device for eliminating colored smoke plumes using space charge injection, characterized in that: It comprises a mist generating chamber, a water droplet catching chamber, a variable frequency fan, a turbulent fan, a water droplet collecting net, an ion emitter and a water collecting pump; the mist generating chamber is connected to the water droplet catching chamber, a smoke inlet and an ambient air inlet are arranged on the mist generating chamber, the variable frequency fan is installed in the ambient air inlet, the fan blades of the turbulent fan are located in the mist generating chamber, and are used to strengthen the mixing of smoke and external air. Under the action of the turbulent fan, the smoke and external air are fully mixed and colored smoke plumes appear; the water droplet catching chamber is provided with multiple levels of the water droplet collecting net and the ion emitter; the water collecting pump is connected to the bottom of the mist generating chamber and the water droplet catching chamber respectively through pipelines; A multi-stage ion emitter and a water droplet collection net combination are provided; The surface of the water droplet collection net is coated with a hydrophobic coating to speed up the removal of the collected water droplets; The ion emitter is connected to the negative electrode of the DC power supply, the positive electrode of the DC power supply is grounded, and the water droplet collection network is grounded; The ion emitter voltage is adjustable.