Electrostatic dust collection system

Abstract

The utility model relates to an electrostatic dust collection system which comprises an electrostatic dust collector and further comprises an air mixing bin communicated with an air inlet of the electrostatic dust collector, and an air blower is arranged between the air mixing bin and the air inlet of the electrostatic dust collector and used for pumping gas to be purified in the air mixing bin to the air inlet of the electrostatic dust collector. The air mixing bin further communicates with a to-be-dedusted air introduction channel used for communicating with a to-be-dedusted area and at least one air introduction channel used for communicating with other areas except the to-be-dedusted area. An air adjusting valve body is arranged at the end, close to the air mixing bin, of the external air guiding-in channel. External air without dust removal is led into the air mixing bin through the air leading-in channel and is mixed with the air to be dedusted led in from the air to be dedusted leading-in channel, so that the concentration of the air to be dedusted is reduced. And meanwhile, the problem that the electrostatic dust collector is in a high-load state for a long time due to overhigh concentration is also avoided.

Description

Technical Field

[0001] The utility model relates to the field of dust removal, and particularly to an electrostatic dust removal system. Background Art

[0002] In a thermal power plant, an electrostatic precipitator is a key environmental protection device, mainly used to reduce the emission of dust and other pollutants in flue gas. The working principle of the electrostatic precipitator is to ionize the gas to be dust-removed by using a high-voltage electric field, and the dust in the gas is charged and separated from the gas flow under the action of the electric field.

[0003] However, in the prior art, when the dust concentration in the gas is too high, a large number of fine dust particles will be suspended in the electric field. These dust particles will hinder the movement of ions, resulting in a sharp drop in the corona current. In severe cases, the corona current may be close to zero. This phenomenon is called corona blocking. The decrease in the corona current will directly affect the dust removal effect, significantly reducing the dust removal efficiency. With the decrease of the corona current, the adsorption and collection ability of the electrostatic precipitator for dust weakens, leading to a sharp deterioration of the dust removal effect. High-concentration dust is difficult to be effectively removed in the electric field and may be discharged with the gas flow, causing environmental pollution.

[0004] In order to reduce the concentration of dust particles, the first solution in the prior art is to increase the working voltage of the electrostatic precipitator or strengthen the electric field. However, this will cause the equipment to be in a high-load operation state for a long time. This will not only shorten the service life of the equipment, but also may cause equipment failures and safety hazards.

[0005] The second solution is to adopt the method of adding a pre-purification device to reduce the concentration of dust particles; however, this method not only increases the investment in equipment, but also increases the energy consumption and maintenance difficulty of the entire dust removal system. Summary of the Utility Model

[0006] In view of this, the utility model aims to provide an electrostatic dust removal system to solve the problems of too high dust particle concentration, high input cost and overloaded operation of the electrostatic precipitator in the prior art.

[0007] To achieve the above object, the technical solution of the utility model is realized as follows:

[0008] The first aspect of the utility model provides an electrostatic dust removal system, including an electrostatic precipitator, and further including:

[0009] A mixed air chamber communicated with the air inlet of the electrostatic precipitator, and a blower is arranged between the mixed air chamber and the air inlet of the electrostatic precipitator to suck the mixed gas in the mixed air chamber to the air inlet of the electrostatic precipitator;

[0010] The mixing air bin is also respectively communicated with a to-be-dusted air introduction channel for communicating with the area to be dusted and at least one air introduction channel for communicating with other areas outside the area to be dusted;

[0011] One end of the external air introduction channel close to the mixing air bin is provided with an air regulating valve body.

[0012] Further, the electrostatic dust removal system further includes a valve body control component corresponding to each air regulating valve body, which is used to control the opening degree of the corresponding air regulating valve body based on the dust concentration at the channel opening of the to-be-dusted air introduction channel or the dust concentration in the mixing air bin.

[0013] Further, the valve body control component includes a dust concentration sensor, an analog controller, and a regulating valve actuator;

[0014] The analog controller receives the data of the dust concentration sensor and controls the opening degree of the air regulating valve body through the regulating valve actuator.

[0015] Further, the dust concentration sensor is arranged at the channel opening of the to-be-dusted air introduction channel.

[0016] Further, the dust concentration sensor is arranged at a position in the mixing air bin close to the corresponding air regulating valve body.

[0017] Further, the dust concentration sensor is selected from one of a laser dust sensor, an infrared dust sensor, a photoelectric dust sensor, an inductive dust sensor, and an ultrasonic dust sensor.

[0018] Further, the analog controller is selected from an analog proportional controller or an analog PID controller.

[0019] Further, there are multiple air introduction channels.

[0020] Further, an air distribution plate is also arranged between the blower and the air inlet of the electrostatic precipitator.

[0021] Further, the blower is a Roots blower.

[0022] Compared with the prior art, the utility model has the following advantages:

[0023] In the present utility model, air that does not need to be dust-removed from the outside is introduced into the air mixing chamber through the air inlet channel and mixed with the air to be dust-removed introduced from the air-to-be-dust-removed inlet channel, so as to reduce the concentration of the air to be dust-removed. There is no need to additionally increase pre-dust-removal equipment, and at the same time, the problem that the electrostatic precipitator is in a high-load state for a long time due to too high a concentration is also avoided. At the same time, the present utility model also dynamically adjusts the flow rate and flow velocity of the air that does not need to be dust-removed entering the air mixing chamber through the air control valve body, so as to avoid reducing the dust-removal efficiency of the electrostatic precipitator due to introducing too much air. Brief Description of the Drawings

[0024] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0025] Figure 1 is a schematic structural diagram of the first embodiment of the electrostatic dust-removal system of the present utility model;

[0026] Figure 2 is a schematic structural diagram of the valve body control assembly of the present utility model;

[0027] Figure 3 is a schematic structural diagram of the second embodiment of the electrostatic dust-removal system of the present utility model;

[0028] Figure 4 is a schematic structural diagram of the third embodiment of the electrostatic dust-removal system of the present utility model;

[0029] Figure 5 is a schematic structural diagram of the fourth embodiment of the electrostatic dust-removal system of the present utility model;

[0030] Figure 6 is a schematic structural diagram of the fifth embodiment of the electrostatic dust-removal system of the present utility model;

[0031] Figure 7 is a schematic structural diagram of the sixth embodiment of the electrostatic dust-removal system of the present utility model.

[0032] Description of the Reference Numerals:

[0033] 1, electrostatic precipitator; 2, air mixing chamber; 3, blower; 4, air inlet channel; 5, air-to-be-dust-removed inlet channel; 6, air control valve body; 7, valve body control assembly; 71, analog controller; 72, valve actuator; 73, dust concentration sensor; 8, air distribution plate. Detailed Embodiments

[0034] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0035] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "back", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0036] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", "connection member" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0037] The following will refer to the attached Figures 1 to 7 and will detail the present utility model in combination with embodiments.

[0038] Embodiment 1

[0039] Overall, as Figure 1 shown, the present utility model provides an electrostatic dust removal system, including an electrostatic precipitator 1, and further including:

[0040] A mixed air chamber 2 communicated with the air inlet of the electrostatic precipitator 1. A blower 3 is arranged between the mixed air chamber 2 and the air inlet of the electrostatic precipitator 1 for pumping the mixed gas in the mixed air chamber 2 to the air inlet of the electrostatic precipitator 1;

[0041] The mixed air chamber 2 is also respectively communicated with a to-be-dusted air introduction channel 5 for communicating with the to-be-dusted area and at least one air introduction channel 4 for communicating with other areas outside the to-be-dusted area;

[0042] An air regulating valve body 6 is arranged at one end of the external air introduction channel 4 close to the mixed air chamber 2.

[0043] The utility model introduces the external air that does not need to be dust-removed into the air mixing bin 2 through the air inlet channel 4 and mixes it with the air to be dust-removed introduced from the air-to-be-dust-removed inlet channel 5, so as to reduce the concentration of the air to be dust-removed. There is no need to additionally increase pre-dust-removal equipment, and at the same time, the problem that the electrostatic precipitator 1 is in a high-load state for a long time due to too high concentration is avoided. At the same time, the utility model also dynamically adjusts the flow rate and flow velocity of the air that does not need to be dust-removed entering the air mixing bin 2 through the air regulating valve body 6, so as to avoid introducing too much air and thus reducing the dust-removal efficiency of the electrostatic precipitator 1.

[0044] Embodiment 2

[0045] The technical solution of this embodiment is similar to that of Embodiment 1. The difference is that, as Figure 2 shown, the electrostatic dust-removal system further includes a valve body control component 7 corresponding to each air regulating valve body 6, which is used to control the opening degree of the corresponding air regulating valve body 6 based on the dust concentration at the channel opening of the air-to-be-dust-removed inlet channel 5 or the dust concentration in the air mixing bin 2.

[0046] The utility model also automatically controls the opening degree of the air regulating valve body 6 through the dust concentration at the channel opening of the air-to-be-dust-removed inlet channel 5 or the dust concentration in the air mixing bin 2 to dynamically adjust the flow rate and flow velocity of the air that does not need to be dust-removed entering the air mixing bin 2, so as to avoid introducing too much air and thus reducing the dust-removal efficiency of the electrostatic precipitator 1. At the same time, compared with the manual control method, the control efficiency of the air regulating valve body 6 is improved and the control is more precise.

[0047] Embodiment 3

[0048] The technical solution of this embodiment is similar to that of Embodiment 2. The difference is that, as Figure 2 shown, the valve body control component 7 includes a dust concentration sensor 73, an analog controller 71 and a regulating valve actuator 72;

[0049] The analog controller 71 receives the data of the dust concentration sensor 73 and controls the opening degree of the air regulating valve body 6 through the regulating valve actuator 72.

[0050] The utility model uses the analog controller 71 as the control mechanism of the air regulating valve body 6. Compared with the programmable logic controller (PLC), this method only needs simple setting and does not need complex program writing. At the same time, the input cost of the utility model is lower, realizing the transformation of the electrostatic dust-removal system with low cost.

[0051] Embodiment 4

[0052] The technical solution of this embodiment is similar to that of Embodiment 3. The difference is that, as Figure 3 shown, the dust concentration sensor 73 is arranged at the channel opening of the air-to-be-dust-removed inlet channel 5.

[0053] In this embodiment, the dust concentration sensor 73 is arranged at the channel opening of the air inlet channel 5 to be dedusted. At this time, the dust concentration sensor 73 can more accurately reflect the dust concentration in the area to be dedusted, and because it is arranged at the channel opening, the maintenance is more convenient.

[0054] Embodiment 5

[0055] The technical solution of this embodiment is similar to that of Embodiment 3, the difference is that, as Figure 4 shown, the dust concentration sensor 73 is arranged at a position in the mixing air chamber 2 close to the corresponding air regulating valve body 6.

[0056] In this embodiment, the dust concentration sensor 73 is arranged at a position in the mixing air chamber 2 close to the corresponding air regulating valve body 6, so that the valve body control assembly 7 can more accurately master the concentration of the mixed gas around the air regulating valve body 6; this is more conducive to the air regulating valve body 6 to adjust the concentration of the mixed gas. Especially when there are multiple air inlet channels 4, the accuracy of the air regulating valve body 6 in adjusting the concentration of the mixed gas will be higher.

[0057] Embodiment 6

[0058] In Embodiments 3 to 5, the dust concentration sensor 73 is selected from one of a laser dust sensor, an infrared dust sensor, a photoelectric dust sensor, an inductive dust sensor, and an ultrasonic dust sensor.

[0059] In this embodiment, the laser dust sensor uses the scattered light formed by the laser beam in the air to detect the dust concentration. When the laser beam passes through the air, the particulate matter will scatter the laser, generating scattered light. This scattered light is captured by the photodetector, and by analyzing the intensity and angle of the scattered light, the sensor can more accurately measure the size and concentration of the particulate matter. The laser dust sensor has higher resolution and sensitivity, and the data accuracy is relatively high. It usually comes with a fan that can generate a stable air flow.

[0060] The infrared dust sensor uses an infrared light source and a photodetector to detect particulate matter in the air. When the particulate matter passes through the infrared beam, it will absorb or scatter the infrared light, resulting in a change in the light intensity received by the detector. By analyzing this change, the sensor can estimate the concentration of the particulate matter. The cost of the infrared dust sensor is relatively low, but it may not be sensitive enough to certain types of particulate matter, and it is generally used for hierarchical display and low-end digital display solutions. Its infrared light source has a relatively long wavelength, and the measurement accuracy for particles with an aerodynamic diameter less than 1um is insufficient, so it is mainly used for the detection of large-particle-size and high-concentration dust such as industrial and mining dust.

[0061] Optoelectronic dust sensors use optical principles to detect the presence of dust. The light source emits light into the measurement area. Dust particles with a high concentration will affect the transmission of light. By detecting the change in the intensity of light with an optoelectronic sensor, the dust concentration can be judged. Optoelectronic dust sensors have a fast response speed and can quickly detect changes in dust.

[0062] Inductive dust sensors use inductive principles to detect the presence of dust particles. An induced current is generated in the induction coil. When dust passes by, the induced current will change. By detecting the change, the dust concentration can be judged. Inductive dust sensors have a low cost, but have high requirements for the working environment and are easily affected by electromagnetic interference.

[0063] Ultrasonic dust sensors use the reflection and scattering of ultrasonic waves to detect the concentration of dust particles. Ultrasonic waves are emitted in the measurement area. When there is dust, it will cause the scattering and reflection of ultrasonic waves. By detecting the echo time, the dust concentration can be judged. Ultrasonic dust sensors have high precision and good stability, but the price is relatively high.

[0064] Example 7

[0065] The technical solution of this example is similar to that of Example 3. The difference is that the analog controller 71 is selected from an analog proportional controller or an analog PID controller. Optionally, the analog PID controller can be an analog PID controller with the model of STANFORD SIM960; the analog proportional controller can be an analog proportional controller with the model of BYQA5F24-P / PS from the manufacturer Noain.

[0066] Example 8

[0067] The technical solution of this example is similar to that of Example 1. The difference is that, as Figure 5 shown, there are multiple air inlet channels 4. In order to make the dust concentration distribution in the mixing chamber 2 more uniform, this example sets multiple air inlet channels 4; multi-point mixing is achieved in the mixing chamber 2, improving the uniformity of the dust concentration in the mixing chamber and also improving the efficiency of dust mixing.

[0068] As Figure 6 shown, when there are multiple air inlet channels 4, there are multiple valve body control components 7 and they correspond to the air control valve body 6 one by one. At this time, the dust concentration sensor 73 is set at the channel opening of the air to be dust-removed inlet channel 5 or at a position in the mixing chamber 2 close to the corresponding air control valve body 6.

[0069] Example 9

[0070] The technical solution of this example is similar to that of Example 1. The difference is that, as Figure 7As shown, an air distribution plate 8 is also provided between the blower 3 and the air inlet of the electrostatic precipitator 1.

[0071] In the present utility model, the air distribution plate 8 enables the air flow entering the dust collector to be evenly distributed. This helps to avoid too high or too low local air flow velocity and reduce the problem of dust accumulation caused by uneven air flow distribution. When the air flow is evenly distributed, each area inside the dust collector can be effectively utilized, thereby improving the overall dust removal efficiency of the electrostatic precipitator 1.

[0072] Embodiment 10

[0073] The technical solution of this embodiment is similar to that of Embodiment 1, except that the blower 3 is a Roots blower.

[0074] The present utility model uses a Roots blower to enable the flow rate to remain relatively stable when the pressure changes. Its rotational speed is proportional to the air volume, which enables the Roots blower to provide a stable air flow within a relatively wide pressure range. When the Roots blower is adjusted within the allowable pressure range, its flow rate changes very little, and the pressure selection range is very wide, with the characteristic of forced air delivery.

[0075] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An electrostatic precipitator system, comprising an electrostatic precipitator (1), characterized in that: Also includes: An air mixing chamber (2) connected to the air inlet of the electrostatic precipitator (1); A blower (3) is provided between the air mixing chamber (2) and the air inlet of the electrostatic precipitator (1) for pumping the mixed gas in the air mixing chamber (2) to the air inlet of the electrostatic precipitator (1); The air mixing chamber (2) is also connected to a dust-removing air introduction channel (5) for connecting to the dust-removing area and at least one air introduction channel (4) for connecting to other areas outside the dust-removing area. An air regulating valve body (6) is provided on one end of the external air introduction channel (4) close to the air mixing chamber (2).

2. An electrostatic precipitator system according to claim 1, characterized in that: The electrostatic dust removal system further comprises a valve body control assembly (7) corresponding to each air regulating valve body (6), the valve body control assembly (7) being used to control the opening of the corresponding air regulating valve body (6) based on the dust concentration at the channel opening of the channel (5) into which the air to be dusted is introduced or the dust concentration in the air mixing chamber (2).

3. An electrostatic dust removal system according to claim 2, characterized in that: The valve body control component (7) comprises a dust concentration sensor (73), an analog controller (71) and a regulating valve actuator (72); The analog controller (71) receives data from the dust concentration sensor (73) and controls the opening of the air regulating valve body (6) through the regulating valve actuator (72).

4. An electrostatic dust removal system according to claim 3, characterized in that: The dust concentration sensor (73) is arranged at the channel opening of the to-be-removed air introduction channel (5).

5. An electrostatic dust removal system according to claim 3, characterized in that: The dust concentration sensor (73) is arranged in the air mixing chamber (2) at a position close to the corresponding air regulating valve body (6).

6. An electrostatic precipitator system according to any one of claims 3 to 5, characterized in that: The dust concentration sensor (73) is selected from one of a laser dust sensor, an infrared dust sensor, a photoelectric dust sensor, an inductive dust sensor and an ultrasonic dust sensor.

7. An electrostatic dust removal system according to claim 3, characterized in that: The analog controller (71) is selected from an analog proportional controller or an analog PID controller.

8. An electrostatic precipitator system according to claim 1, characterized in that: The air introduction channels (4) are multiple.

9. An electrostatic precipitator system according to claim 1, characterized in that: An air uniforming plate (8) is also provided between the blower (3) and the air inlet of the electrostatic precipitator (1).

10. An electrostatic precipitator system according to claim 1, characterized in that: The blower (3) is a Roots blower.

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