Anti-blocking device for sampling pipe of demister of desulfurization system of thermal power plant

Abstract

An anti-blocking device for a sampling pipe of a demister of a desulfurization system of a thermal power plant is characterized in that a flushing pipeline is taken from a flushing pipeline of a demister layer and welded into a source taking port buffer area, a purging pipeline is taken from a compressed air pipeline and welded into the source taking port buffer area, and a differential pressure transmitter is connected into the source taking port buffer area. The differential pressure transmitter divides the source taking port buffer area into a high-pressure source taking pipeline and a low-pressure source taking pipeline, a source taking pipeline electrified closing electromagnetic valve is installed on the high-pressure source taking pipeline, a flushing water pipe electrified opening electromagnetic valve is installed on the flushing pipeline, a compressed air purging pipe electrified opening electromagnetic valve is installed on the purging pipeline, and a control box is installed on the absorption tower. According to the utility model, through regular purging, the labor of mechanical dredging is reduced, the real condition of reaction pressure is measured by the differential pressure transmitter, the timer can set which time periods are energized within 24 hours and the other time periods are de-energized, the energy-saving advantage is realized, and when power is supplied to the time relay to be energized is controlled through the timer, and then the time delay relay is controlled to act.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline inner wall cleaning, in particular to a device for preventing blocking of a sampling pipe of a demister of a desulfurization system of a thermal power plant. Background Art

[0002] Device purging is an indispensable and important link in the production of desulfurization system, mainly to eliminate hidden dangers, avoid unnecessary losses, and enable the system to operate smoothly. There are usually three purging methods: water flushing; air purging; steam purging. Water flushing is a method of flushing pipes and equipment by pumping water as the medium. Air purging uses air as the medium and is pressurized to 0.6-0.8Mpa by an air compressor. The air pressure and water pressure that water flushing and air purging rely on require specific equipment to produce, and have a certain dependence on the release of production site equipment. Steam purging has high temperature, high pressure, and fast flow rate. The pipe expands and displaces after heating, and shrinks after cooling. Therefore, the impact on the system structure must be fully considered, and it is necessary to stay away from steam pipes to ensure the safety of personnel and equipment during purging. In a thermal power plant desulfurization system, water flushing and air purging are combined. The purging includes the sampling tubes on the high-pressure side and the low-pressure side of the demister layer. The locations that need purging on site include flushing water pipes and compressed air pipes. Only two gas sources and two flushing water pipes are needed nearby. When flushing the sampling pipeline, the gas source pipe and the sampling tube must be closed. However, the sampling tube is located at a higher position on the low-pressure side and is not easy to be blocked, but it is located at a lower position on the high-pressure side and is very easy to be blocked, which seriously affects the smoothness of the inner wall and can only be dredged mechanically, greatly reducing work efficiency. Summary of the invention

[0003] In order to solve the above problems, the utility model provides a device for preventing blocking of a sampling pipe of a demister of a desulfurization system of a thermal power plant.

[0004] The technical solution adopted by this utility model:

[0005] A device for preventing the demister sampling pipe from being blocked in a desulfurization system of a thermal power plant comprises a flushing pipeline welded into a source port buffer zone and taken from a flushing pipeline of a demister layer, a purge pipeline welded into a source port buffer zone and taken from a compressed air pipeline, a differential pressure transmitter is connected in the source port buffer zone, the differential pressure transmitter divides the source port buffer zone into a high-pressure source pipeline and a low-pressure source pipeline, the high-pressure source pipeline is connected to the front end of a source pipeline that is easily scaled and connected to an absorption tower, the front end of the source pipeline that is easily scaled is connected to the flushing pipeline and the purge pipeline, a source pipeline live closing electromagnetic valve is installed on the high-pressure source pipeline, and a flushing water pipe is installed on the flushing pipeline An electromagnetic valve is energized to open, and a compressed air purge pipe is installed on the purge pipeline with an electromagnetic valve that is energized to open. A control box is installed on the absorption tower. Three time relays are arranged in the control box, one of which is a power-off delay relay electrically connected to the electromagnetic valve that is energized to close in the source pipeline, and the other two are respectively electrically connected to the electromagnetic valve that is energized to open in the flushing water pipe and the electromagnetic valve that is energized to open in the compressed air purge pipe. Timer A and timer B are arranged in the control box, timer A is connected to the power-on delay relay that controls the flushing pipeline, and timer B is connected to the power-off delay relay that controls the high-pressure source pipeline and the power-on delay relay that controls the purge pipeline.

[0006] The connection position of the low-pressure source pipeline connected to the absorption tower is higher than the connection position of the high-pressure source pipeline.

[0007] The control box is installed at the 0-meter position of the absorption tower.

[0008] The two timers are 24-hour settable timers.

[0009] The beneficial effects of the utility model: the utility model reduces the labor of mechanical dredging through timed purging, the differential pressure transmitter measures the actual situation of the reaction pressure, the timer can set which time periods within 24 hours are powered on and the rest of the time is powered off, which has the advantage of energy saving. The timer controls when to power on the time relay, and then controls the action of the delay relay, controls the opening and closing of the electromagnetic valve, changes the purging and flushing time, and improves the patency of the inner wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the differential pressure source pipeline of the demister layer of the absorption tower of the utility model.

[0011] Figure 2 It is a structural schematic diagram of the utility model.

[0012] Figure 3 This is the electrical circuit diagram of the utility model.

[0013] Among them: 1-differential pressure transmitter; 2-low-pressure source pipeline; 3-high-pressure source pipeline; 4-demister layer; 5-source pipeline electromagnetic valve with power on; 6-compressed air purge pipe electromagnetic valve with power on; 7-flushing water pipe electromagnetic valve with power on; 8-front end of source pipeline prone to scaling; 9-absorption tower; 10-power supply for timer A set to power on min; 11-power supply for timer B set to power on min; 12-flushing function electrical circuit; 13-source pipeline switch electrical circuit; 14-purge function electrical circuit. DETAILED DESCRIPTION

[0014] A device for preventing the demister sampling pipe from being blocked in a desulfurization system of a thermal power plant comprises a flushing pipeline welded into a source port buffer zone and taken from a flushing pipeline of a demister layer 4, a purge pipeline welded into a source port buffer zone and taken from a compressed air pipeline, a differential pressure transmitter 1 is connected in the source port buffer zone, the differential pressure transmitter 1 divides the source port buffer zone into a high-pressure source pipeline 3 and a low-pressure source pipeline 2, the high-pressure source pipeline 3 is connected to a front end 8 of a source pipeline that is easily scaled and connected to an absorption tower 9, the front end 8 of the source pipeline that is easily scaled is connected to the flushing pipeline and the purge pipeline, a source pipeline live closing electromagnetic valve 5 is installed on the high-pressure source pipeline 3, and a flushing valve 5 is installed on the flushing pipeline The water pipe is energized to open the electromagnetic valve 7, and the compressed air purge pipe is installed on the purge pipeline. The control box is installed on the absorption tower 9. Three time relays are arranged in the control box, one of which is a power-off delay relay electrically connected to the source pipeline's energized closing electromagnetic valve 5, and the other two are electrically connected to the flushing water pipe's energized opening electromagnetic valve 7 and the compressed air purge pipe's energized opening electromagnetic valve 6 respectively. Timer A and timer B are arranged in the control box, timer A is connected to the power-on delay relay controlling the flushing pipeline, and timer B is connected to the power-off delay relay controlling the high-pressure source pipeline 3 and the power-on delay relay controlling the purge pipeline.

[0015] The connection position of the low-pressure source pipeline 2 connected to the absorption tower 9 is higher than the connection position of the high-pressure source pipeline 3 .

[0016] The control box is installed at the 0-meter position of the absorption tower 9 for easy maintenance.

[0017] The two timers are 24-hour settable timers, which can set which time periods within 24 hours are powered on and the rest of the time is powered off, which has the advantage of energy saving.

[0018] Working principle: The timer controls when to supply power to the time relay. The working process is to set flushing at least once a day. When the flushing time is up, the source pipeline is first closed with the power on and off electromagnetic valve 5. After flushing, the flushing water pipe will be closed with the power on and off electromagnetic valve 7. After purging, the compressed air purge pipe will be closed with the power on and off electromagnetic valve 6. After purging, the source pipeline will be opened with the power on and off electromagnetic valve 5. If timer A is set for 12 minutes and timer B is set for 20 minutes, all time relays are adjusted to 3 minutes, and the two timers are powered at the same time, then the working principle is as follows. After power supply, the source pipeline is closed with the power on and off electromagnetic valve 5 is turned off. At 3 minutes, the flushing water pipe of the flushing pipeline is opened with the power on and off electromagnetic valve 7, and the compressed air purge pipe is opened with the power on and off electromagnetic valve 6 for purging. At 12 minutes, the flushing is stopped because the timer A is powered off and the flushing is restored. At 20 minutes, the timer B is powered off, and the compressed air purge pipe is closed with the power on and off electromagnetic valve 6 to stop purging. After 25 minutes, due to the action of the power-off delay relay, the source pipeline is powered off and the electromagnetic valve 5 is powered off and opened. This process takes 17 minutes to purge and 9 minutes to flush. The purge and flushing time can be changed by changing the setting of the timer.

[0019] By changing the combination of purging and flushing by setting the timer, you can achieve only flushing or only cleaning, but try not to perform purging and flushing operations after the sampling tube is opened. Figure 3 The electrical circuit diagram is only one of the envisioned implementation methods, including a flushing function electrical circuit 12, a switch electrical circuit 13 for controlling the source pipeline, and a purge function electrical circuit 14. A power supply 10 for setting the power-on time of timer A supplies power to the flushing function electrical circuit 12, and a power supply 11 for setting the power-on time of timer B supplies power to the switch electrical circuit 13 for controlling the source pipeline and the purge function electrical circuit 14.

[0020] Example 1 (Purge only, timer A not set)

[0021] 1) When the purge time is reached, the electrical circuit of timer B is energized, and the electromagnetic valve 5 of the source pipeline is first turned off;

[0022] 2) After a few minutes, the compressed air purge pipe is energized to open the electromagnetic valve 6, and the compressed air is introduced into the front end 8 of the source pipeline to be flushed, which is prone to scaling, to blow the shallow impurities attached to the inner wall surface into the reaction tank of the absorption tower. When the timer B is up, the purge pipeline is closed, and then the source pipeline is energized to close the electromagnetic valve 5 and open

[0023] 3) If the indication is normal, the operator can notify timer A that it does not need to be set, that is, flushing is not required, and regular purge is sufficient every day.

[0024] Example 2 (Purge first, then rinse)

[0025] 1) When the purge time is reached, the electrical circuit of timer B is energized, and the electromagnetic valve 5 of the source pipeline is first turned off;

[0026] 2) The setting time of the timer B of the power-on delay relay controlling the purge pipeline is set to be shorter than the setting time of the timer A of the power-on delay relay controlling the flushing pipeline. The compressed air purge pipe on the purge pipeline is energized to open the electromagnetic valve 6 first, and the process water is introduced into the front end 8 of the source pipeline to be flushed and prone to scaling. After flushing for one or two minutes, the electromagnetic valve 7 of the flushing pipeline is energized to open;

[0027] 3) After the process is completed, the electromagnetic valve 5 of the source pipeline will open with a delay.

[0028] Example 3 (rinsing first, then purging)

[0029] 1) When the purge time is reached, the electrical circuit of timer B is energized, and the electromagnetic valve 5 of the source pipeline is first turned off;

[0030] 2) The setting time of the timer B of the power-on delay relay controlling the purge pipeline is set to be longer than the setting time of the timer A of the power-on delay relay controlling the flushing pipeline. The electromagnetic valve 7 of the flushing pipeline is energized to be opened first. After the front end 8 of the source pipeline that is prone to scaling to be flushed is flushed with process water for one or two minutes, the electromagnetic valve 6 of the compressed air purge pipe on the purge pipeline is energized to be opened;

[0031] 3) After the process is completed, the electromagnetic valve 5 of the source pipeline will open with a delay.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The above is a detailed description of the embodiments of the utility model, but the contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A device for preventing blocking of sampling pipe of demister of desulfurization system in thermal power plant, characterized in that: The invention comprises a flushing pipeline welded into the buffer zone of the source port and taken from the flushing pipeline of the demister layer (4), and a purge pipeline welded into the buffer zone of the source port and taken from the compressed air pipeline. A differential pressure transmitter (1) is connected in the buffer zone of the source port. The differential pressure transmitter (1) divides the buffer zone of the source port into a high-pressure source pipeline (3) and a low-pressure source pipeline (2). The high-pressure source pipeline (3) is connected to the front end (8) of the source pipeline that is easy to scale and connected to the absorption tower (9). The front end (8) of the source pipeline that is easy to scale is connected to the flushing pipeline and the purge pipeline. The high-pressure source pipeline (3) is equipped with a source pipeline live closing electromagnetic valve (5), and the flushing pipeline is equipped with a flushing water pipe live opening electromagnetic valve (6). A magnetic valve (7) is installed on the purge pipeline, and a compressed air purge pipe energized open electromagnetic valve (6) is installed on the absorption tower (9). Three time relays are arranged in the control box, one of which is a power-off delay relay electrically connected to the source pipeline energized closed electromagnetic valve (5), and the other two are respectively electrically connected to the flushing water pipe energized open electromagnetic valve (7) and the compressed air purge pipe energized open electromagnetic valve (6). A timer A and a timer B are arranged in the control box, and the timer A is connected to the energized delay relay controlling the flushing pipeline, and the timer B is connected to the power-off delay relay controlling the high-pressure source pipeline (3) and the energized delay relay controlling the purge pipeline.

2. The anti-blocking device for the sampling pipe of the demister of the desulfurization system of a thermal power plant according to claim 1 is characterized in that: The connection position of the low-pressure source pipeline (2) connected to the absorption tower (9) is higher than the connection position of the high-pressure source pipeline (3).

3. The anti-blocking device for the sampling pipe of the demister of the desulfurization system of a thermal power plant according to claim 1 is characterized in that: The control box is installed at the 0-meter position of the absorption tower (9).

4. The anti-blocking device for the sampling pipe of the demister of the desulfurization system of a thermal power plant according to claim 1 is characterized in that: The two timers are 24-hour settable timers.

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