Control circuit for electric heating device of ash bucket of bag-type dust collector

Abstract

The utility model discloses a control circuit for an electric heating device of a dust hopper of a bag-type dust collector. Comprising a power supply loop, a miniature circuit breaker, a front ash bucket heating control loop, a rear ash bucket heating control loop, a left ash bucket heating control loop, a right ash bucket heating control loop, a PT100 temperature sensor, a contactor, a miniature circuit breaker, an ash bucket electric heater, a control change-over switch and a multi-channel temperature inspection control instrument. According to the utility model, on the premise that all functions of the original technical scheme can be realized, the maintenance cost is greatly reduced, and the operation cost is reduced.

Description

[Technical field]

[0001] The utility model relates to the technical field of bag dust collector control circuits, in particular to the technical field of control circuits of ash hopper electric heating devices for bag dust collectors. [Background technology]

[0002] The bag filter is an important part of the deacidification and dust removal system, and is mainly used to control the dust content in the flue gas. Due to the particularity of waste incineration, the ash produced is generally humid. The dust collector hopper heating uses a heating element to heat the inside of the hopper, so that the dust is not easy to accumulate inside the hopper and has better fluidity, thereby enhancing the dust removal effect of the dust collector. At the same time, heating can also evaporate the water in the hopper, reduce the weight of the hopper, and improve the operation efficiency of the equipment.

[0003] There are two main methods for heating the ash hopper of a bag filter: electric heating and steam heating. Electric heating is to heat the ash hopper by installing an electric heater on the air insulation layer outside the ash hopper. It is less affected by the ambient humidity and temperature and can automatically adjust the temperature. The electric heating device for the ash hopper of a bag filter has been widely used to reduce the deposition of ash and effectively prevent dust accumulation.

[0004] The existing control method of the ash hopper electric heating device of the bag filter is to set up a local control cabinet nearby, which has multiple sets of electrical circuits to control the corresponding ash hopper electric heating. Each set of ash hopper electric heating is composed of multiple electric heating plates or multiple electric heating cables. The local control cabinet connects the signal to the DCS or PLC control card through hard wiring, and then remotely starts and stops through the DCS or PLC.

[0005] The above control method has the following defects:

[0006] 1. When some electric heating plates or electric heating cables fail, it is difficult to troubleshoot without removing the entire ash hopper insulation, which can easily affect production operations;

[0007] 2. A single set of ash hopper electric heating is only equipped with one PT100 temperature sensor, which is easily affected by the installation position. If it is too far away from the heating point, the temperature of the temperature measuring point will not reach the set value, causing the electric heating to run all the time, which is easy to burn the high-temperature wire; if it is too close to the heating point, the entire ash hopper cannot be heated evenly. [Contents of the utility model]

[0008] The purpose of the utility model is to solve the problems in the prior art and to propose a control circuit for an electric heating device for an ash hopper of a bag filter, which can greatly reduce maintenance costs and operating costs while satisfying all the functions that can be achieved by the original technical solution.

[0009] To achieve the above-mentioned purpose, the utility model proposes a control circuit for an electric heating device of an ash hopper of a bag filter, comprising a power supply circuit, a miniature circuit breaker, a front ash hopper heating control circuit, a rear ash hopper heating control circuit, a left ash hopper heating control circuit, a right ash hopper heating control circuit, a PT100 temperature sensor, a contactor, a miniature circuit breaker, an ash hopper electric heater, a control conversion switch and a multi-channel temperature inspection controller, wherein the output end of the power supply circuit is respectively connected to the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit through a miniature circuit breaker, and the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit are connected to the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit. The circuit structure of the hopper heating control circuit is the same. The front hopper heating control circuit includes a PT100 temperature sensor, a contactor, a miniature circuit breaker and an ash hopper electric heater. The miniature circuit breaker is connected to the power supply circuit. The PT100 temperature sensor is connected to the miniature circuit breaker through the contactor. The ash hopper electric heater is connected to the PT100 temperature sensor. The hopper electric heating device is connected with a control conversion switch. A manual control circuit and an automatic control circuit are arranged in the control conversion switch. The multi-channel temperature inspection controller is respectively connected to the PT100 temperature sensors of the front hopper heating control circuit, the rear hopper heating control circuit, the left hopper heating control circuit and the right hopper heating control circuit.

[0010] Preferably, an intermediate relay is arranged in series between the multi-channel temperature inspection controller and the PT100 temperature sensor.

[0011] Preferably, the multi-channel temperature inspection controller is connected to two DCS modules respectively, the output end of one DCS module is connected to the control transfer switch through a closing button, and the output end of the other DCS module is connected to the control transfer switch through a tripping button.

[0012] Preferably, the multi-channel temperature inspection controller controls the ash hopper electric heaters of the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit respectively.

[0013] Preferably, the multi-channel temperature inspection controller is provided with closing indicator lights corresponding to the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit.

[0014] Preferably, the multi-channel temperature inspection controller is provided with upper and lower temperature limits and an alarm temperature, and the upper and lower temperature limits and the alarm temperature are adjustable.

[0015] Preferably, the multi-channel temperature inspection controller is provided with an audible and visual alarm.

[0016] Beneficial effects of the utility model: The utility model combines power supply circuit, miniature circuit breaker, front ash hopper heating control circuit, rear ash hopper heating control circuit, left ash hopper heating control circuit, right ash hopper heating control circuit, PT100 temperature sensor, contactor, miniature circuit breaker, ash hopper electric heater, control conversion switch and multi-channel temperature inspection controller together. After experimental optimization, the electric heating local control cabinet is equipped with four sets of electrical circuits for each ash hopper, respectively controlling the ash hopper electric heaters arranged on the front, back, left and right sides of the ash hopper, and setting a multi-channel temperature inspection controller to collect signals of 4 PT100 temperature sensors arranged on the four sides of the ash hopper, setting the upper and lower limits of each temperature, alarm temperature and other parameters, and triggering the automatic closing and tripping of the heating control circuits of the ash hopper electric heaters on each side through the over-temperature alarm of the multi-channel temperature inspection controller to realize ash hopper partition control. And by setting manual / automatic control circuit switching for each ash hopper electric heater, maintenance requirements are met.

[0017] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings.

Brief Description of the Drawings

[0018] Figure 1 This is the principle of the control circuit of the utility model for the electric heating device of the dust hopper of the bag filter Figure 1 ;

[0019] Figure 2 This is the principle of the control circuit of the utility model for the electric heating device of the dust hopper of the bag filter Figure 2 ;

[0020] Figure 3 This is the principle of the control circuit of the utility model for the electric heating device of the dust hopper of the bag filter Figure 3 ;

[0021] Figure 4 This is the principle of the control circuit of the utility model for the electric heating device of the dust hopper of the bag filter Figure 4 . [Specific implementation method]

[0022] See also Figure 1 , Figure 2 , Figure 3 and Figure 4The utility model is used for a control circuit of an electric heating device for a hopper of a bag filter, and comprises a power supply circuit, a miniature circuit breaker, a front hopper heating control circuit, a rear hopper heating control circuit, a left hopper heating control circuit, a right hopper heating control circuit, a PT100 temperature sensor, a contactor, a miniature circuit breaker, an hopper electric heater, a control conversion switch and a multi-channel temperature inspection controller. The output end of the power supply circuit is respectively connected to the front hopper heating control circuit, the rear hopper heating control circuit, the left hopper heating control circuit and the right hopper heating control circuit through a miniature circuit breaker. The front hopper heating control circuit, the rear hopper heating control circuit, the left hopper heating control circuit and the right hopper heating control circuit are The circuit structures of the loops are the same. The front ash hopper heating control loop includes a PT100 temperature sensor, a contactor, a miniature circuit breaker and an ash hopper electric heater. The miniature circuit breaker is connected to the power supply loop. The PT100 temperature sensor is connected to the miniature circuit breaker through the contactor. The ash hopper electric heater is connected to the PT100 temperature sensor. The ash hopper electric heating device is connected with a control conversion switch. A manual control loop and an automatic control loop are arranged in the control conversion switch. The multi-channel temperature inspection controller is respectively connected to the PT100 temperature sensors of the front ash hopper heating control loop, the rear ash hopper heating control loop, the left ash hopper heating control loop and the right ash hopper heating control loop.

[0023] Preferably, an intermediate relay is arranged in series between the multi-channel temperature inspection controller and the PT100 temperature sensor.

[0024] Preferably, the multi-channel temperature inspection controller is connected to two DCS modules respectively, the output end of one DCS module is connected to the control transfer switch through a closing button, and the output end of the other DCS module is connected to the control transfer switch through a tripping button.

[0025] Preferably, the multi-channel temperature inspection controller controls the ash hopper electric heaters of the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit respectively.

[0026] Preferably, the multi-channel temperature inspection controller is provided with closing indicator lights corresponding to the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit.

[0027] Preferably, the multi-channel temperature inspection controller is provided with upper and lower temperature limits and an alarm temperature, and the upper and lower temperature limits and the alarm temperature are adjustable.

[0028] Preferably, the multi-channel temperature inspection controller is provided with an audible and visual alarm.

[0029] The utility model combines a power supply circuit, a miniature circuit breaker, a front ash hopper heating control circuit, a rear ash hopper heating control circuit, a left ash hopper heating control circuit, a right ash hopper heating control circuit, a PT100 temperature sensor, a contactor, a miniature circuit breaker, an ash hopper electric heater, a control conversion switch and a multi-channel temperature inspection controller. After experimental optimization, the electric heating local control cabinet is provided with four sets of electrical circuits for each ash hopper, respectively controlling the ash hopper electric heaters arranged on the front, back, left and right sides of the ash hopper, and a multi-channel temperature inspection controller is provided to collect signals of four PT100 temperature sensors provided on the four sides of the ash hopper, set the upper and lower limits of each temperature, the alarm temperature and other parameters, and trigger the automatic closing and tripping of the heating control circuits of the ash hopper electric heaters on each side through the over-temperature alarm of the multi-channel temperature inspection controller, so as to realize the ash hopper partition control. And by setting the manual / automatic control circuit switch for each ash hopper electric heater, the maintenance requirements are met.

[0030] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. The control circuit for the electric heating device of the dust hopper of the bag filter is characterized by: It includes a power supply circuit, a miniature circuit breaker, a front ash hopper heating control circuit, a rear ash hopper heating control circuit, a left ash hopper heating control circuit, a right ash hopper heating control circuit, a PT100 temperature sensor, a contactor, a miniature circuit breaker, an ash hopper electric heater, a control conversion switch and a multi-channel temperature inspection controller. The output end of the power supply circuit is connected to the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit through a miniature circuit breaker. The circuit structures of the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit are the same. The surface ash hopper heating control circuit includes a PT100 temperature sensor, a contactor, a miniature circuit breaker and an ash hopper electric heater. The miniature circuit breaker is connected to the power supply circuit. The PT100 temperature sensor is connected to the miniature circuit breaker through the contactor. The ash hopper electric heater is connected to the PT100 temperature sensor. The ash hopper electric heating device is connected with a control conversion switch. A manual control circuit and an automatic control circuit are arranged in the control conversion switch. The multi-channel temperature inspection controller is respectively connected to the PT100 temperature sensors of the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit.

2. The control circuit for the electric heating device of the ash hopper of the bag filter according to claim 1, characterized in that: An intermediate relay is arranged in series between the multi-channel temperature inspection controller and the PT100 temperature sensor.

3. The control circuit for the electric heating device of the dust hopper of a bag filter according to claim 1, characterized in that: The multi-channel temperature inspection controller is connected to two DCS modules respectively, the output end of one DCS module is connected to the control conversion switch through a closing button, and the output end of the other DCS module is connected to the control conversion switch through a tripping button.

4. The control circuit for the electric heating device of the ash hopper of the bag filter according to claim 1, characterized in that: The multi-channel temperature inspection controller controls the ash hopper electric heaters of the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit respectively.

5. The control circuit for the electric heating device of the ash hopper of the bag filter according to claim 1, characterized in that: The multi-channel temperature inspection controller is provided with closing indicator lights corresponding to the front ash hopper heating control circuit, the rear ash hopper heating control circuit, the left ash hopper heating control circuit and the right ash hopper heating control circuit.

6. The control circuit for the electric heating device of the ash hopper of the bag filter according to claim 1, characterized in that: The multi-channel temperature inspection controller is provided with temperature upper and lower limits and an alarm temperature, and the temperature upper and lower limits and the alarm temperature are adjustable.

7. The control circuit for the electric heating device of the ash hopper of a bag filter according to claim 1, characterized in that: The multi-channel temperature inspection controller is provided with an audible and visual alarm.

Images