Anti-condensation cloth bag dust collector

Abstract

The utility model provides a kind of anti-condensation cloth bag dust collector, it is related to dust removal device field, including dust collector body, the dust collector body has dust-containing gas inlet and clean gas outlet, dust collector body further includes shell, jacket insulation, electric heating device, reuse pipeline and recovery pipeline;The shell is cladded in the outer wall of the dust collector body, and the jacket insulation formed between dust collector body and shell, spiral airflow channel is set in jacket insulation, and electric heating device is set in the jacket insulation or the wall surface of the dust collector body;Reuse pipeline one end is communicated with the clean gas outlet, other end is communicated with the airflow channel in jacket insulation, and airflow channel is communicated to the dust-containing gas inlet by recovery pipeline, and the application provides a kind of anti-condensation cloth bag dust collector, the waste heat of sufficient recovery and purification after flue gas, energy utilization rate is high, automatic control, can realize the cloth bag dust collector of high-efficiency anti-condensation under full working condition.

Description

Technical Field

[0001] This utility model relates to the field of dust removal devices, specifically to an anti-condensation bag dust collector. Background Technology

[0002] In actual operation, when the flue gas being treated has a high moisture content or the external ambient temperature is low, there is a significant temperature difference between the inside and outside of the dust collector shell. This can easily cause the flue gas to cool below its dew point temperature on the inner wall of the dust collector, the filter bags, and the surface of the metal structural parts, resulting in condensation.

[0003] Condensation can cause a series of serious problems: First, the condensate mixed with dust forms a viscous paste that clogs the filter bags (i.e., "bag clogging"), leading to a sharp increase in system resistance, a decrease in dust removal efficiency, and even complete failure of the filter bags; Second, if the flue gas contains acidic gases such as sulfur oxides, the resulting acid condensation will cause serious corrosion to the steel structure of the equipment, greatly shortening the service life of the dust collector; In addition, the dust in the ash hopper becomes damp and clumps together, causing difficulties in ash removal and affecting the normal operation of the system.

[0004] Existing solutions typically include: 1) laying an insulation layer on the outside of the dust collector, but this is a passive measure and has limited effectiveness when there are large temperature differences; 2) using simple preheating at startup, but it cannot cope with temperature fluctuations during operation. Utility Model Content

[0005] To overcome the problems in the background technology, this utility model provides an anti-condensation bag filter dust collector that fully recovers the waste heat of the purified flue gas, has high energy utilization, automatic control, and can achieve high-efficiency anti-condensation bag filter dust collector under all working conditions.

[0006] An anti-condensation baghouse dust collector includes a dust collector body with a dust-laden gas inlet and a clean gas outlet. The dust collector body also includes an outer shell, a jacketed insulation layer, an electric heating device, a reuse pipeline, and a recovery pipeline. The outer shell covers the outer wall of the dust collector body, and a jacketed insulation layer is formed between the dust collector body and the outer shell. A spiral airflow channel is provided within the jacketed insulation layer. The electric heating device is disposed within the jacketed insulation layer or on the wall of the dust collector body. One end of the reuse pipeline is connected to the clean gas outlet, and the other end is connected to the airflow channel within the jacketed insulation layer. The airflow channel is connected to the dust-laden gas inlet via the recovery pipeline.

[0007] Furthermore, a control system is installed on the dust collector body. The control system includes a PLC controller and a temperature sensor. The temperature sensor is installed in the dust-laden gas inlet, the jacket insulation layer, and inside the dust collector body. The temperature sensor is connected to the PLC controller, and the PLC controller is connected to the electric heating device.

[0008] Furthermore, the reuse pipeline is also equipped with a circulating fan and an automatic valve, and the PLC controller is connected to the circulating fan and the automatic valve.

[0009] Compared with the prior art, the beneficial effects of this utility model are:

[0010] 1. Through the four-fold protection of "electric preheating + jacket active insulation + inlet mixing and heating + electric auxiliary heating", the temperature control of the whole process from start-up to operation is realized, which is extremely reliable and can completely avoid the occurrence of condensation.

[0011] 2. The waste heat of the purified flue gas is fully recovered. By using a two-stage series connection of "jacket insulation" and "inlet mixing", energy utilization efficiency is maximized. Electric heating is only used for preheating and supplementation under extreme conditions, and the energy consumption during daily operation is extremely low.

[0012] 3. Under the control of PLC and other control systems, the system can automatically adjust the flow rate of recycled gas and start / stop the auxiliary heating according to the real-time temperature without manual intervention, ensuring the long-term stable operation of the system and adapting to different process and environmental changes. Attached Figure Description

[0013] To clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments are explained.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the rear structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the internal structure of this utility model.

[0017] Attached reference numerals: 1-Dust collector body, 2-Outer shell, 3-Jacketed insulation layer, 4-Recovery pipeline, 5-Dust-laden gas inlet, 6-Clean gas outlet, 7-Electric heating device, 8-Reuse pipeline, 9-Circulating fan, 10-Control system, 31-Spiral airflow channel. Detailed Implementation

[0018] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the preferred embodiments of this utility model will be described in detail below with reference to the accompanying drawings, so as to facilitate the understanding of those skilled in the art.

[0019] See Figure 1-3This utility model proposes an anti-condensation bag filter dust collector, including a dust collector body 1, which has a dust-laden gas inlet 5 and a clean gas outlet 6, and also includes an outer shell 2, a jacketed insulation layer 3, an electric heating device 7, a reuse pipeline 8, and a recovery pipeline 4. The outer shell 2 covers the outer wall of the dust collector body 1, and a jacketed insulation layer 3 is formed between the dust collector body 1 and the outer shell 2. A spiral airflow channel 31 is provided in the jacketed insulation layer 3, and the electric heating device 7 is disposed in the jacketed insulation layer 3 or on the wall of the dust collector body 1. One end of the reuse pipeline 8 is connected to the clean gas outlet 6, and the other end is connected to the airflow channel 31 in the jacketed insulation layer 3. The airflow channel 31 is connected to the dust-laden gas inlet 5 through the recovery pipeline 4.

[0020] The spiral airflow channel 31 is set inside the jacket insulation layer (3) and is composed of a spiral guide plate. Its function is to force the hot airflow to flow around the dust collector body 1 in a spiral path. Compared with a simple cavity, the spiral channel significantly increases the airflow path and prolongs the residence time of the hot airflow in the jacket, thereby greatly improving the heat exchange efficiency and uniformity between the hot airflow and the inner wall of the dust collector body 1, and avoiding the generation of local cold spots. The reuse pipeline 8 and the recovery pipeline 4 are the carriers for waste heat recovery and utilization. The reuse pipeline 8 extracts the purified and high-temperature clean gas from the clean gas outlet 6 and transports it as a heat source to the inlet of the spiral airflow channel 31. After the spiral airflow channel 31 completes the first "heating" of the box, the hot airflow still has residual heat. The recovery pipeline 4 leads this gas with calorific value out from the channel outlet and transports it to the dust-laden gas inlet 5, mixes it with the original dust-laden flue gas, realizes the second "preheating" of the flue gas, and completes the cascade utilization of thermal energy.

[0021] The electric heating device 7 is integrated into the jacket insulation layer 3 or directly attached to the wall of the dust collector body 1. It can be an electric heating wire. Its functions are: first, to preheat the equipment as the main heat source before the dust collector is started in a cold state; and second, to supplement the heating as an auxiliary heat source when the heat recovered from waste heat is insufficient to maintain a safe temperature during normal operation.

[0022] See Figure 1-3 A control system 10 is installed on the dust collector body 1. The control system 10 includes a PLC controller and temperature sensors. The temperature sensors are installed in the dust-laden gas inlet 5, the jacket insulation layer 3, and the dust collector body 1. The temperature sensors are connected to the PLC controller, and the PLC controller is connected to the electric heating device 7. The multi-point distributed temperature sensors are responsible for collecting temperature data of key nodes of the system in real time and transmitting the signals to the PLC controller. The PLC controller analyzes the real-time temperature data according to the preset logic program and sends "on" or "off" commands to the electric heating device 7.

[0023] See Figure 1-3The reuse pipeline 8 is also equipped with a circulating fan 9 and an automatic valve. The PLC controller is connected to the circulating fan 9 and the automatic valve. The circulating fan 9 and the automatic valve are installed in series on the reuse pipeline 8. The circulating fan 9 provides sufficient power to overcome the flow resistance of the spiral airflow channel 31 and the entire pipeline system, ensuring that the hot airflow can circulate stably and in sufficient quantity. The function of the automatic valve is to precisely regulate the flow rate of the reused hot airflow.

[0024] Work process:

[0025] 1. Preheating stage (cold start)

[0026] Before the main process equipment is started and the dust-laden flue gas enters the dust collector, the PLC controller in the control system 10 first enters the preheating mode, and its working process is as follows:

[0027] The PLC controller starts the electric heating device 7 installed in the jacket insulation layer 3 to directly heat the metal wall panel of the dust collector body 1, which is the main heat source in the preheating process.

[0028] At the same time, the PLC controller can start the circulating fan 9 on the reuse pipeline 8 and open the automatic valve to make the air in the jacket insulation layer 3 circulate at low speed in the spiral airflow channel 31. The purpose is not to reuse heat energy, but to use the circulating airflow to evenly transfer the heat generated by the electric heating device 7 to every corner of the dust collector body 1, so as to ensure that the temperature of the box, ash hopper and other parts can be raised evenly and quickly, and avoid local temperature differences.

[0029] The temperature sensor installed inside the dust collector body 1 continuously feeds real-time temperature data back to the PLC controller. When the PLC controller confirms that the internal temperature has reached the preset safety value (for example, 20°C higher than the theoretical dew point of the flue gas), the preheating stage ends automatically, and the system enters standby mode, ready to receive dust-laden flue gas.

[0030] 2. Normal operation phase

[0031] After the main process equipment is started, the dust-laden flue gas enters the dust collector body 1 through the dust-laden gas inlet 5. At this time, the control system 10 automatically switches to normal operation mode:

[0032] Primary heat recovery (jacketed heat tracing): Based on the initial reading of the temperature sensor, the PLC controller instructs the circulating fan 9 to start and open the automatic valve on the recovery pipeline 8, drawing a portion of high-temperature clean gas from the clean gas outlet 6. This hot airflow is introduced into the jacket insulation layer 3 through the recovery pipeline 8 and begins to flow around the wall for a long time and a long distance in the spiral airflow channel 31. During this process, the hot airflow efficiently and evenly transfers its own heat to the inner wall of the dust collector body 1 through convection heat transfer, so as to actively compensate for the heat dissipation caused by the external environment. This is the first and most direct heat preservation measure.

[0033] Secondary heat recovery (inlet mixing): After the "heat tracing" of the box is completed, the gas with residual heat flows out from the outlet of the spiral airflow channel 31 and enters the recovery pipeline 4. The function of the recovery pipeline 4 is to accurately deliver the hot airflow to the dust-laden gas inlet 5 and fully mix it with the original dust-laden flue gas entering the dust collector, thereby increasing the overall inlet temperature of the flue gas and forming a second level of protection to prevent condensation.

[0034] Auxiliary Heating: Throughout the operation, temperature sensors installed in the dust-laden gas inlet 5 (after mixing), the jacket insulation layer 3, and the dust collector body 1 continuously transmit data to the PLC controller. The PLC controller analyzes this data in real time and prioritizes adjusting the opening of the automatic valve and the speed of the circulating fan 9 to change the flow rate of the recycled hot gas, thereby performing fine-tuned temperature regulation. If, due to extreme reasons such as excessively low original flue gas temperature or a sudden drop in ambient temperature, even with the recycled airflow adjusted to its maximum, the system temperature still tends to fall below the safety threshold, the PLC controller will immediately and automatically activate the electric heating device 7 for supplementary heating, working in conjunction with the waste heat recovery system. Once the temperature rises back to the safe range, the electric heating automatically stops, and the system returns to its most energy-efficient operating state.

[0035] Through the multi-stage synergistic effect of preheating, primary heat tracing, secondary mixing, and intelligent auxiliary heating, this invention ensures that the temperature inside the dust collector can be reliably maintained above the flue gas dew point at all times, thereby ultimately achieving the goal of high efficiency, intelligence, and all-condition anti-condensation.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A dust collector with anti-condensation bag filter, comprising a dust collector body (1), wherein the dust collector body (1) has a dust-laden gas inlet (5) and a clean gas outlet (6), characterized in that: It also includes an outer shell (2), a jacket insulation layer (3), an electric heating device (7), a reuse pipeline (8), and a recycling pipeline (4); the outer shell (2) covers the outer wall of the dust collector body (1), the jacket insulation layer (3) is formed between the dust collector body (1) and the outer shell (2), a spiral airflow channel (31) is provided in the jacket insulation layer (3), and the electric heating device (7) is provided in the jacket insulation layer (3) or on the wall of the dust collector body (1); one end of the reuse pipeline (8) is connected to the clean gas outlet (6), and the other end is connected to the airflow channel (31) in the jacket insulation layer (3), and the airflow channel (31) is connected to the dust-laden gas inlet (5) through the recycling pipeline (4).

2. The anti-condensation bag filter according to claim 1, characterized in that, A control system (10) is installed on the dust collector body (1). The control system (10) includes a PLC controller and a temperature sensor. The temperature sensor is installed in the dust-laden gas inlet (5), the jacket insulation layer (3), and the dust collector body (1). The temperature sensor is connected to the PLC controller, and the PLC controller is connected to the electric heating device (7).

3. The anti-condensation bag filter according to claim 2, characterized in that, The reuse pipeline (8) is also equipped with a circulating fan (9) and an automatic valve, and the PLC controller is connected to the circulating fan (9) and the automatic valve.

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