A device for detecting the level of a CFB semi-dry desulfurization dust hopper

Abstract

The utility model discloses a detection device of CFB semi -dry process desulfurization dust removal ash bucket material position, including detection pipe group, and detection pipe group includes horizontal communication pipe, vertical guide pipe and cleaning pipe, and horizontal communication pipe sets up horizontally, and one end of horizontal communication pipe corresponds the material position warning height of dust removal ash bucket and sets up in dust removal ash bucket, and the other end is connected with the end of vertical guide pipe and cleaning pipe through three -way pipe simultaneously, and vertical guide pipe sets up vertically, and cleaning pipe is coaxial with horizontal communication pipe and sets up, is provided with first valve on horizontal communication pipe, is provided with second valve on vertical guide pipe, is provided with third valve on cleaning pipe, the utility model discloses adopt physical monitoring mode, can carry out the direct and reliable judgement to ash bucket high material position, can cooperate the monitoring of existing material position meter and play the function of supplementary verification simultaneously, ensure that dust removal ash bucket material position is in proper, safe state, avoid the dust removal ash bucket material too much and cause ash bucket cracking, collapse and so on safety accidents.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas purification equipment, specifically to a detection device for the material level in the ash hopper of CFB semi-dry desulfurization and dust removal process. Background Technology

[0002] In a CFB (circulating fluidized bed) semi-dry desulfurization system, the dust hopper is used to collect desulfurization byproducts. Accurate monitoring of the material level in the hopper is crucial for system safety. Excessive material level can overload the hopper structure, posing a risk of cracking or even collapse, and can also affect the stable operation of the desulfurization system.

[0003] Currently, radar level gauges, rotary paddle level gauges, or radio frequency admittance level gauges are commonly used for continuous monitoring. However, semi-dry desulfurization ash has the characteristics of high moisture content and easy adhesion, which makes it very easy for scale to form and adhere on the probe or sensing components of level gauges, leading to sensor failure, false alarms or missed alarms, and making effective monitoring impossible.

[0004] In view of the above-mentioned defects, the creator of this utility model has finally obtained this utility model after a long period of research and practice. Summary of the Invention

[0005] To address the aforementioned technical deficiencies, the present invention provides a detection device for the material level in a CFB semi-dry desulfurization and dust removal hopper, comprising a detection tube assembly. The detection tube assembly includes a horizontal connecting pipe, a vertical guide pipe, and a cleaning pipe. The horizontal connecting pipe is horizontally positioned, with one end set within the dust removal hopper at a warning height corresponding to the material level. The other end is connected to both the vertical guide pipe and the cleaning pipe via a T-junction. The vertical guide pipe is vertically positioned, with its top end connected to the T-junction and its bottom end serving as a monitoring port. The cleaning pipe is coaxially aligned with the horizontal connecting pipe, with one end connected to the T-junction and the other end connected to a compressed air source. A first valve is installed on the horizontal connecting pipe, a second valve on the vertical guide pipe, and a third valve on the cleaning pipe.

[0006] Preferably, the third valve is a pulse valve.

[0007] Preferably, the same dust collector hopper is provided with multiple detection tube groups, and the horizontal connecting pipes of each detection tube group are evenly distributed in a ring around the axis of the dust collector hopper, and the horizontal connecting pipes are arranged radially.

[0008] Preferably, the system also includes a controller, to which the first valve, the second valve, and the third valve are all connected.

[0009] Preferably, it also includes an annular connecting pipe, which is a horizontally arranged circular tube and is coaxially arranged with the dust collector hopper. The monitoring port of each of the vertical guide pipes is connected to the annular connecting pipe. A monitoring tube is provided at the bottom of the annular connecting pipe, one end of which is connected to the annular connecting pipe and the other end is provided with a first negative pressure indicator.

[0010] Preferably, a fourth valve is also provided on the vertical guide pipe, the vertical guide pipe is connected to the second negative pressure indicator through a branch monitoring pipe, the connection point of the vertical guide pipe and the branch monitoring pipe is located between the fourth valve and the second valve, and the second negative pressure indicator is connected to the horizontal connecting pipe through the second valve.

[0011] Preferably, a level gauge is installed in the dust collector hopper at the corresponding material level warning height, and the level gauge, the first negative pressure indicator, and the second negative pressure indicator are all connected to the controller.

[0012] Preferably, a fifth valve is provided on the branch monitoring pipe, and the fifth valve is connected to the controller.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model adopts a physical monitoring method, which can make a direct and reliable judgment on the high material level in the ash hopper, and plays an auxiliary verification role in the monitoring of existing material level gauges. It avoids the problem of insufficient monitoring reliability caused by sensor failure due to ash adhesion, and effectively prevents the occurrence of high material levels. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the detection device for the material level in the ash hopper of the CFB semi-dry desulfurization and dust removal process in Embodiment 1. Figure 2 This is a schematic diagram of the detection device for the material level in the CFB semi-dry desulfurization and dust removal hopper in Embodiment 2; Figure 3 This is a schematic diagram of the detection device for the material level in the CFB semi-dry desulfurization and dust removal hopper in Example 3.

[0015] The numbers in the image represent: 1-Horizontal connecting pipe; 2-Vertical guide pipe; 3-Cleaning pipe; 4-Dust hopper; 5-Compressed air source; 6-First valve; 7-Second valve; 8-Third valve; 9-Annular connecting pipe; 10-Monitoring pipe; 11-First negative pressure indicator; 12-Level gauge; 13-Fourth valve; 14-Branch monitoring pipe; 15-Second negative pressure indicator; 16-Fifth valve. Detailed Implementation

[0016] The above-mentioned and other technical features and advantages of this utility model will be described in more detail below with reference to the accompanying drawings. Example 1

[0017] like Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of the detection device for the ash hopper level in the CFB semi-dry desulfurization and dust removal process in this embodiment.

[0018] The CFB semi-dry desulfurization and dust removal hopper material level detection device of this utility model includes a detection pipe assembly, which includes a horizontal connecting pipe 1, a vertical guide pipe 2, and a cleaning pipe 3. The horizontal connecting pipe 1 is horizontally arranged, and one end of the horizontal connecting pipe 1 is set at the material level warning height of the dust removal hopper 4 inside the dust removal hopper 4. The other end is connected to the ends of the vertical guide pipe 2 and the cleaning pipe 3 through a three-way pipe. The vertical guide pipe 2 is vertically arranged, and the top end of the vertical guide pipe 2 is connected to the three-way pipe, and the bottom end is set as a monitoring port. The cleaning pipe 3 is coaxially arranged with the horizontal connecting pipe 1, and one end of the cleaning pipe 3 is connected to the three-way pipe, and the other end is connected to a compressed air source 5. A first valve 6 is provided on the horizontal connecting pipe 1, a second valve 7 is provided on the vertical guide pipe 2, and a third valve 8 is provided on the cleaning pipe 3. The corresponding pipeline connections can be controlled through each valve.

[0019] Preferably, the third valve 8 can be a pulse valve. With the horizontal connecting pipe 1 and the cleaning pipe 3 coaxially connected, the third valve 8 can be used to perform pulse cleaning on the horizontal connecting pipe 1 and the cleaning pipe 3 to avoid long-term accumulation of desulfurization ash in the horizontal connecting pipe 1, which can cause pipe blockage.

[0020] The vertical arrangement of the vertical guide pipe 2 ensures that when the desulfurized ash in the dust removal hopper 4 is higher than the material level warning height, the desulfurized ash in the dust removal hopper 4 falls to the monitoring port through the horizontal connecting pipe 1 and under its own gravity via the vertical guide pipe 2.

[0021] Preferably, the same dust collector hopper 4 is provided with multiple detection tube groups, and the horizontal connecting pipes 1 of each detection tube group are evenly distributed in a ring around the axis of the dust collector hopper 4. The horizontal connecting pipes 1 are arranged radially, so that the dust collector hopper 4 can be monitored at different positions at the material level warning height at the same time, and the material level at different horizontal positions inside the hopper can be determined, avoiding misjudgment caused by material level tilt.

[0022] In practical use, this utility model is in a purging phase every once in a while. During the purging phase, the first valve 6 is opened and the second valve 7 is closed. The third valve 8 is controlled to perform daily cleaning of the horizontal connecting pipe 1 to prevent desulfurization ash from sticking to the port of the horizontal connecting pipe 1 and causing blockage during the ash collection process.

[0023] During the monitoring phase, the first valve 6 is opened, the third valve 8 is closed, and the second valve 7 is opened. The operator monitors the negative pressure at the monitoring port. Specifically, the operator feels the airflow at the monitoring port's outlet by hand, or observes a negative pressure indicator at the monitoring port. If a significant negative pressure (inhalation) is felt or the negative pressure indicator shows negative pressure, it indicates that the airflow in the horizontal connecting pipe 1 and the vertical guide pipe 2 is flowing towards the dust collector hopper 4, and the port of the horizontal connecting pipe 1 is in the cavity area above the material surface, indicating a safe material level. If no negative pressure is felt, or even if ash flows out of the monitoring port, it indicates that the ash has submerged the port of the horizontal connecting pipe 1, and the material level has reached the high-level warning line, requiring immediate ash removal. Except during the purging and monitoring phases, the first valve 6 is normally closed to prevent ash from entering the detection pipe group.

[0024] Preferably, the detection device for the material level in the CFB semi-dry desulfurization and dust removal hopper 4 further includes a controller. The first valve 6, the second valve 7, and the third valve 8 are all connected to the controller. The controller controls the opening and closing of the first valve 6, the second valve 7, and the third valve 8, thereby realizing intelligent control of the purging stage and the monitoring stage.

[0025] This invention employs a physical monitoring method, which can intuitively and reliably determine the high material level in the ash hopper. It can also be used in conjunction with existing level gauges to assist in verification, avoiding the problem of insufficient monitoring reliability caused by sensor failure due to ash adhesion. This ensures that the material level in the dust collector ash hopper is in a suitable and safe state, and prevents safety accidents such as ash hopper cracking and collapse caused by excessive material in the dust collector ash hopper. Example 2

[0026] like Figure 2 As shown, Figure 2 This is a schematic diagram of the detection device for the material level in the CFB semi-dry desulfurization and dust removal hopper 4 in this embodiment.

[0027] In this embodiment, multiple detection tube groups are provided in the same dust hopper 4, and the detection device for the material level in the CFB semi-dry desulfurization dust hopper 4 also includes an annular connecting pipe 9. The annular connecting pipe 9 is a horizontally arranged circular tube and is coaxially arranged with the dust hopper 4. The monitoring port of each vertical guide pipe 2 is connected to the annular connecting pipe 9. A monitoring tube 10 is provided at the bottom of the annular connecting pipe 9. One end of the monitoring tube 10 is connected to the annular connecting pipe 9, and the other end is provided with a first negative pressure indicator 11. The first negative pressure indicator 11 is connected to the controller, which can monitor the overall negative pressure of the detection tube groups in real time.

[0028] Preferably, a level gauge 12 is installed in the dust hopper 4 at the corresponding material level warning height. The level gauge 12 is connected to the controller, and the controller simultaneously monitors the status of the level gauge 12 and the status of the first negative pressure indicator 11.

[0029] Specifically, under normal conditions, the level gauge 12 monitors the material level in real time. When the level gauge 12 alarms, the present invention enters the monitoring stage, opens the first valve 6 and the second valve 7, closes the third valve 8, and monitors the negative pressure through the first negative pressure indicator 11. If there is no negative pressure, it indicates that the level gauge 12 is normal and the material level has reached the warning value. If negative pressure occurs, all the second valves 7 are closed and then each of the second valves 7 is opened individually. The negative pressure status of each detection tube group is monitored through the first negative pressure indicator 11. If there is negative pressure in all of them, it indicates that the level gauge 12 has malfunctioned and needs to be maintained. If any detection tube group has no negative pressure, it indicates that the level gauge 12 is normal and the material level is tilted, requiring temporary adjustments such as material release. Example 3

[0030] like Figure 3 As shown, Figure 3 This is a schematic diagram of the detection device for the material level in the CFB semi-dry desulfurization and dust removal hopper 4 in this embodiment.

[0031] This embodiment is a further improvement on embodiment two. The improvement is that a fourth valve 13 is also provided on the vertical guide pipe 2. The vertical guide pipe 2 is connected to the second negative pressure indicator 15 through the branch monitoring pipe 14. The connection point between the vertical guide pipe 2 and the branch monitoring pipe 14 is located between the fourth valve 13 and the second valve 7. The second negative pressure indicator 15 is connected to the horizontal connecting pipe 1 through the second valve 7. The second negative pressure indicator 15 is connected to the controller.

[0032] Specifically, under normal conditions, the level gauge 12 monitors the material level in real time. When the level gauge 12 alarms, the present invention enters the monitoring stage, opening the first valve 6, the second valve 7, and the fourth valve 13, and closing the third valve 8. The negative pressure is monitored by the first negative pressure indicator 11. If there is no negative pressure, it indicates that the level gauge 12 is normal and the material level has reached the warning value. If negative pressure occurs, the fourth valve 13 is closed, and the negative pressure status of each detection tube group is monitored by each of the second negative pressure indicators 15. If there is negative pressure in all tube groups, it indicates that the level gauge 12 has malfunctioned and needs maintenance. If some detection tube groups show no negative pressure, it indicates that the level gauge 12 is normal and the material level is tilted, requiring temporary adjustments such as material release. The second negative pressure indicator 15 is used to avoid situations where the first negative pressure indicator 11 is inaccurate due to blockage of the annular connecting pipe 9.

[0033] Both the first negative pressure indicator 11 and the second negative pressure indicator 15 are negative pressure indicators commonly used in the prior art.

[0034] Preferably, a fifth valve 16 is provided on the branch monitoring pipe 14. The fifth valve 16 is connected to the controller. When negative pressure monitoring is performed by the first negative pressure indicator 11, the fifth valve 16 is closed to avoid the monitoring branch of the second negative pressure indicator 15 from affecting the monitoring of the first negative pressure indicator 11.

[0035] The above description is merely a preferred embodiment of the present utility model and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present utility model, all of which will fall within the protection scope of the present utility model.

Claims

1. A device for detecting the material level in the ash hopper of CFB semi-dry desulfurization and dust removal process, characterized in that, The system includes a detection tube assembly comprising a horizontal connecting pipe, a vertical guide pipe, and a cleaning pipe. The horizontal connecting pipe is horizontally positioned, with one end set at the material level warning height of the dust collector hopper within the hopper. The other end is connected to the ends of both the vertical guide pipe and the cleaning pipe via a T-junction. The vertical guide pipe is vertically positioned, with its top end connected to the T-junction and its bottom end serving as a monitoring port. The cleaning pipe is coaxially positioned with the horizontal connecting pipe, with one end connected to the T-junction and the other end connected to a compressed air source. A first valve is installed on the horizontal connecting pipe, a second valve on the vertical guide pipe, and a third valve on the cleaning pipe.

2. The detection device for the ash hopper level in CFB semi-dry desulfurization and dust removal as described in claim 1, characterized in that, The third valve is a pulse valve.

3. The detection device for the ash hopper level in CFB semi-dry desulfurization and dust removal as described in claim 1, characterized in that, The same dust collector hopper is provided with multiple detection tube groups, and the horizontal connecting pipes of each detection tube group are evenly distributed in a ring around the axis of the dust collector hopper, and the horizontal connecting pipes are arranged radially.

4. The detection device for the ash hopper level in CFB semi-dry desulfurization and dust removal as described in claim 3, characterized in that, It also includes a controller, to which the first valve, the second valve, and the third valve are all connected.

5. The detection device for the ash hopper level in CFB semi-dry desulfurization and dust removal as described in claim 4, characterized in that, It also includes an annular connecting pipe, which is a horizontally arranged circular tube and is coaxially arranged with the dust collector hopper. The monitoring port of each of the vertical guide pipes is connected to the annular connecting pipe. A monitoring tube is provided at the bottom of the annular connecting pipe, one end of which is connected to the annular connecting pipe and the other end is provided with a first negative pressure indicator.

6. The detection device for the ash hopper level in CFB semi-dry desulfurization and dust removal as described in claim 5, characterized in that, A fourth valve is also provided on the vertical guide pipe. The vertical guide pipe is connected to the second negative pressure indicator through a branch monitoring pipe. The connection point between the vertical guide pipe and the branch monitoring pipe is located between the fourth valve and the second valve. The second negative pressure indicator is connected to the horizontal connecting pipe through the second valve.

7. The detection device for the ash hopper level in CFB semi-dry desulfurization and dust removal as described in claim 6, characterized in that, A level gauge is installed in the dust collector hopper at the corresponding material level warning height. The level gauge, the first negative pressure indicator, and the second negative pressure indicator are all connected to the controller.

8. The detection device for the ash hopper level in CFB semi-dry desulfurization and dust removal as described in claim 7, characterized in that, A fifth valve is installed on the branch monitoring pipe, and the fifth valve is connected to the controller.

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