Dust remover ash hopper material anti-caking early warning device and anti-caking method

Abstract

The invention provides a dust remover ash bucket material anti-caking early warning device which comprises a dust remover ash bucket defined by wall plates, a discharging port is formed in the bottom of the dust remover ash bucket, and at least one first continuous material level measuring device is arranged above the position close to the center of the discharging port and used for measuring the material pressure P1 at the position; the depth from the first continuous material level measuring device to the surface of the ash material is h1; at least one second continuous material level measuring device is arranged at the position close to the wall plate and used for measuring the material pressure P2 at the position, and the depth from the second continuous material level measuring device to the surface of the ash material at the position is h2; the height difference between the first continuous material level measuring device and the second continuous material level measuring device is h3; the horizontal distance of the first continuous material level measuring device deviating from the center line of the ash hopper is L1, the horizontal distance of the second continuous material level measuring device deviating from the center line of the ash hopper is L2, L1 is larger than or equal to 0, and L1 is smaller than L2; and calculating a deviation value between the P1 and the P2-rho gh3, and if the deviation value is greater than an early warning value, determining that the vehicle is in an early warning state. The invention further discloses an anti-caking method.

Description

Technical Field

[0001] The invention relates to the field of circulating fluidized bed desulfurization, and in particular to a dust collector ash hopper material anti-caking early warning device and an anti-caking method. Background Art

[0002] Circulating fluidized bed (semi) dry desulfurization requires the desulfurization ash collected by the dust collector to be continuously circulated back to the absorption tower. The dust collector ash hopper needs to have a large amount of ash storage. The ash hopper generally uses a boat-shaped ash hopper or a round / semi-conical ash hopper to store ash. The boat-shaped ash hopper is long, and the bottom of the round / semi-conical ash hopper is wide. Although there is a fluidizing plate at the bottom, the ash stored on both sides of the long side of the ash hopper and the corners of the bottom is not easy to flow because the edge is far from the discharge port.

[0003] The circulating fluidized bed (semi) dry desulfurization ash has high humidity and strong viscosity. After desulfurization, the desulfurization ash is very likely to accumulate on both sides and in the corners of the bottom of the dust collector hopper, and will not flow for a long time, which will lead to compaction or agglomeration inside the hopper. The density of the material will change after aggregation, and there may be a drop in the top surface of the material in the hopper.

[0004] However, according to the existing technology, if the desulfurization ash in the ash hopper aggregates, it cannot be discovered and reported in time. The only way to investigate the aggregation and agglomeration of desulfurization ash in the ash hopper is passively when it becomes compacted and forms ash blocks that affect the normal operation of the desulfurization system. At this time, adding more fluidizing air cannot eliminate the agglomeration.

[0005] Therefore, there is a need for an early warning device that can provide timely feedback on the accumulation of desulfurized ash, so that the fluidizing air volume at the accumulation point can be increased in time for forced fluidization, which can effectively avoid the above problems. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a dust collector ash hopper material anti-caking early warning device and an anti-caking method, which can quickly warn of the aggregation of desulfurization ash in the ash hopper, avoid agglomeration, compaction and high material level in the ash hopper.

[0007] In order to solve the above technical problems, the present invention provides a dust collector ash hopper material anti-caking early warning device, comprising a dust collector ash hopper surrounded by wall panels, a discharge port is provided at the bottom of the dust collector ash hopper, and at least one first continuous material level measuring device is provided near the upper center of the discharge port to measure the material pressure P1 at the location, and the depth of the first continuous material level measuring device from the ash material surface at the location is h1;

[0008] At least one second continuous material level measuring device is arranged near the wall plate to measure the material pressure P2 at the location, and the depth of the second continuous material level measuring device from the surface of the ash material at the location is h2; the height difference between the first continuous material level measuring device and the second continuous material level measuring device is h3;

[0009] The horizontal distance that the first continuous material level measuring device deviates from the center line of the ash hopper is L1, and the horizontal distance that the second continuous material level measuring device deviates from the center line of the ash hopper is L2, and L1≥0, and L1 is less than L2;

[0010] Calculate the deviation between P1 and P2-ρgh3. If the deviation is greater than the warning value, it is in warning state and the fluidizing air injection volume is increased until the deviation between P1 and P2-ρgh3 is less than the warning value.

[0011] In some embodiments, the warning value is 3%.

[0012] In some embodiments, the distance between the first continuous material level measuring device and the bottom of the wall panel is H1, and the distance between the second continuous material level measuring device and the bottom of the wall panel is H2, and H1 and H2 do not exceed 50% of the height of the ash hopper.

[0013] In some of the embodiments, the dust collector ash hopper includes trapezoidal front and rear wall panels and left and right wall panels, and the front and rear wall panels and left and right wall panels enclose a boat-shaped ash hopper.

[0014] In some of the embodiments, the front and rear wall panels and the left and right wall panels have different lengths to form long side wall panels and short side wall panels, and the discharge port is arranged at the bottom of one long side wall panel.

[0015] In some embodiments, the first continuous material level measuring device is disposed at the center of the material outlet of the long side wall plate, and the second continuous material level measuring device is disposed close to the long side wall plate or the short side wall plate.

[0016] In some embodiments, the bottom side length of the long side wall panel is L, L1≤1 / 4L, and L2≥1 / 4L.

[0017] In some of the embodiments, the dust collector hopper is enclosed by wall panels to form a conical or semi-conical hopper.

[0018] In some embodiments, the discharge port is arranged at the bottom of the center position of the conical or semi-conical ash hopper, and the first continuous material level measuring device is arranged at the center position of the ash hopper.

[0019] In some embodiments, the bottom diameter of the conical or semi-conical ash hopper is L, L1≤1 / 4L, and L2≥1 / 4L.

[0020] In order to solve the above technical problems, the present invention also provides a dust collector ash hopper anti-caking method, including the dust collector ash hopper material anti-caking early warning device as claimed in claim 1, comprising the following steps:

[0021] Step 1: The dust collector hopper material anti-caking early warning device measures the material pressures P1 and P2;

[0022] Step 2: Calculate the deviation between P1 and P2-ρgh3, and compare whether the deviation is greater than the warning value. If the deviation is greater than the warning value, proceed to step 3.

[0023] Step 3: Increase the fluidizing air injection volume until the deviation between P1 and P2-ρgh3 is less than the warning value.

[0024] Compared with the prior art, the beneficial effect of the present invention lies in that at least one first continuous material level measuring device is arranged above the discharge port where the fluidity of the desulfurization ash is good to measure the material pressure P1, and at least two second continuous material level measuring devices are arranged near the wall panel where agglomeration is prone to occur to measure the material pressure P2; agglomeration is warned by calculating whether the deviation value of P1 and P2-ρgh3 exceeds the warning value (where h3 is the height difference between the first continuous material level measuring device and the second continuous material level measuring device); if the deviation value is greater than the warning value, it is in a warning state, and the fluidizing air injection amount is increased until the deviation value between P1 and P2-ρgh3 is less than the warning value, thereby being able to quickly warn of the aggregation of desulfurization ash in the ash hopper and intervene in advance to prevent the desulfurization ash from agglomerating and compacting in the ash hopper and the material level of the ash hopper being too high. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of measuring ash hopper level with continuous level measuring device;

[0026] Figure 2 This is a schematic diagram of the long side wall of the ship-shaped ash hopper;

[0027] Figure 3 This is a schematic diagram of the short side wall of the ship-shaped ash hopper;

[0028] Figure 4 This is a diagram showing the measurement position of the ship-shaped ash hopper;

[0029] Figure 5 This is the measurement position identification diagram of the semi-conical ash hopper.

[0030] Figure numerals: 1. dust collector; 2. dust collector ash hopper; 3. wall panel; 31. long side wall panel; 32. short side wall panel; 4. discharge port. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Example 1

[0035] Reference Figure 1-4 As shown, this embodiment provides a dust collector ash hopper material anti-caking warning device arranged below the dust collector 1, including a boat-shaped dust collector ash hopper 2 surrounded by trapezoidal front and rear wall panels and left and right wall panels; the length of the front and rear wall panels is greater than the length of the left and right wall panels, the front and rear wall panels form long side wall panels 31, and the left and right wall panels form short side wall panels 32, and a discharge port 4 is provided at the bottom of the long side wall panel 31 on one side of the boat-shaped dust collector.

[0036] The desulfurized ash near the ash hopper outlet 4 flows more fully and is better fluidized. The material pressure here can truly reflect the height of the material in the ash hopper. Therefore, in this embodiment, at least one first continuous material level measuring device is arranged above the center of the outlet 4 near the long side wall plate 31 to measure the material pressure P1 there. The depth of the first continuous material level measuring device from the ash surface there is h1;

[0037] If the desulfurized ash far from the side wall of the discharge port 4 is not fluid enough and there is aggregation, the density of the material will change, and the top of the material will be uneven and tilted, and the material pressure will change greatly. Therefore, in this embodiment, at least one second continuous material level measuring device is set near the long side wall plate 31 to measure the material pressure P2 at this location. The depth of the second continuous material level measuring device from the surface of the ash material at this location is h2. The first continuous material level measuring device and the second continuous material level measuring device adopt the existing method of measuring the material level of the dust collector hopper 2, such as Figure 1 The continuous material level measuring device shown.

[0038] In order to ensure the accuracy of the measurement, the position of the second continuous material level measuring device represents the corner of the ash hopper, and the position of the first continuous material level measuring device represents the position where the desulfurized ash in the ash hopper is better fluidized. The horizontal distance of the first continuous material level measuring device from the center line of the ash hopper is L1, and the horizontal distance of the second continuous material level measuring device from the center line of the ash hopper is L2. The bottom length of the long side wall plate 31 is L, where 0≤L1≤1 / 4L, and L2≥1 / 4L. Figure 4 As shown in the figure, when measuring the material pressure P1, the first continuous material level measuring device is located above the center line of the ash hopper, at this time L1 = 0; when measuring the material pressure P1', the first continuous material level measuring device is at a distance L1 from the center line of the ash hopper, where 0 <L1≤1 / 4L。

[0039] Therefore, by comparing the desulfurized ash pressure in the middle of the discharge port 4 with the pressure deviation of the desulfurized ash at the corner, it is possible to determine whether desulfurized ash is aggregated at the corner. As a simple alternative to this embodiment, the second continuous material level measuring device can also be arranged at the short side wall plate 32.

[0040] When the first continuous material level measuring device and the second continuous material level measuring device are arranged, they are not completely arranged on the same horizontal plane. There is a height difference between the first continuous material level measuring device and the second continuous material level measuring device, and the height difference is h3.

[0041] During normal operation, the material inside the hopper is evenly distributed, P1≈P2-ρgh3, that is, the material pressure P1 measured by the first continuous material level measuring device should be approximately equal to the material pressure P2 measured by the second continuous material level measuring device minus the pressure difference ρgh3 formed between the two due to the height difference. When the desulfurization ash aggregates, the material continues to accumulate at the wall plate, and the material level h1 at the location of the second continuous material level measuring device changes, P2-ρgh3 will deviate from P1. Therefore, calculating the deviation value between P1 and P2-ρgh3 can warn whether the desulfurization ash in the hopper is aggregated and has a tendency to stick at the wall plate.

[0042] Specifically, calculate whether the deviation between P1 and P2-ρgh3 is greater than the warning value of 3%. If the deviation is less than 3%, it means that the material level inside the ash hopper is evenly distributed, the materials in the ash hopper are basically in a flowing state, the density is basically the same, and there is no desulfurization ash aggregation. If the deviation is greater than the warning value of 3%, it means that it is in a warning state and the ash hopper has a tendency to stick. At this time, increase the amount of fluidizing air blown in until the deviation between P1 and P2-ρgh3 is less than the warning value of 3%.

[0043] Since agglomeration mostly occurs at the bottom of the ash hopper, in order to more accurately warn of the aggregation of desulfurization ash, the distance between the first continuous material level measuring device and the bottom of the wall panel is H1, and the distance between the second continuous material level measuring device and the bottom of the wall panel is H2, and H1 and H2 do not exceed 50% of the height of the ash hopper.

[0044] When the anti-caking early warning device for material in the dust collector hopper 2 of this embodiment is used to prevent agglomeration, the method includes the following steps:

[0045] Step 1: The anti-caking warning device for materials in the dust collector hopper 2 measures the material pressures P1 and P2;

[0046] Step 2: Calculate the deviation between P1 and P2-ρgh3, and compare whether the deviation is greater than the warning value. If the deviation is greater than the warning value, proceed to step 3.

[0047] Step 3: Increase the fluidizing air injection volume until the deviation between P1 and P2-ρgh3 is less than the warning value.

[0048] Example 2

[0049] Reference Figure 5 As shown, the difference between this embodiment and embodiment 1 is that the dust collector ash hopper 2 of this embodiment adopts a semi-conical ash hopper surrounded by wall panels 3.

[0050] The discharge port 4 is arranged at the bottom of the center of the semi-conical hopper, so the first continuous material level measuring device is arranged at the center of the hopper, and the second continuous material level measuring device is arranged near the wall panel 3. In this embodiment, L is the bottom diameter L of the semi-conical hopper, where 0≤L1≤1 / 4L, and L2≥1 / 4L. The rest is the same as in Embodiment 1 and will not be described here. As a simple alternative to this embodiment, the dust collector hopper can also adopt a conical hopper surrounded by a wall panel.

[0051] The above is only a preferred specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any technician familiar with the technical field who uses this concept to make non-substantial changes to the present invention within the technical scope disclosed by the present invention shall be deemed to infringe the protection scope of the present invention.

Claims

1. A dust collector ash hopper material anti-caking early warning device, comprising a dust collector ash hopper surrounded by wall panels, wherein a discharge port is provided at the bottom of the dust collector ash hopper, characterized in that: At least one first continuous material level measuring device is arranged above the center of the discharge port to measure the material pressure P1 at the location, and the depth of the first continuous material level measuring device from the surface of the ash material at the location is h1; At least one second continuous material level measuring device is arranged near the wall plate to measure the material pressure P2 at the location, and the depth of the second continuous material level measuring device from the surface of the ash material at the location is h2; the height difference between the first continuous material level measuring device and the second continuous material level measuring device is h3; The horizontal distance that the first continuous material level measuring device deviates from the center line of the ash hopper is L1, and the horizontal distance that the second continuous material level measuring device deviates from the center line of the ash hopper is L2, and L1≥0, and L1 is less than L2; Calculate the deviation between P1 and P2-ρgh3. If the deviation is greater than the warning value, it is in warning state and the fluidizing air injection volume is increased until the deviation between P1 and P2-ρgh3 is less than the warning value.

2. The dust collector hopper material anti-caking warning device according to claim 1 is characterized in that: The warning value is 3%.

3. The dust collector hopper material anti-caking warning device according to claim 1 is characterized in that: The distance between the first continuous material level measuring device and the bottom of the wall plate is H1, and the distance between the second continuous material level measuring device and the bottom of the wall plate is H2. The distances H1 and H2 do not exceed 50% of the height of the ash hopper.

4. The dust collector hopper material anti-caking warning device according to claim 1 is characterized in that: The dust collector ash hopper comprises trapezoidal front and rear wall plates and left and right wall plates, and the front and rear wall plates and left and right wall plates enclose a boat-shaped ash hopper.

5. The dust collector hopper material anti-caking warning device according to claim 4 is characterized in that: The front and rear wall panels and the left and right wall panels have different lengths to form a long side wall panel and a short side wall panel, and the discharge port is arranged at the bottom of one long side wall panel.

6. The dust collector hopper material anti-caking warning device according to claim 5 is characterized in that: The first continuous material level measuring device is arranged at the center of the material outlet of the long side wall plate, and the second continuous material level measuring device is arranged close to the long side wall plate or the short side wall plate.

7. The dust collector hopper material anti-caking warning device according to claim 5 is characterized in that: The bottom edge length of the long side wall panel is L, L1≤1 / 4L, and L2≥1 / 4L.

8. The dust collector hopper material anti-caking warning device according to claim 1 is characterized in that: The dust collector ash hopper is enclosed by wall panels to form a conical or semi-conical ash hopper.

9. The dust collector hopper material anti-caking warning device according to claim 8, characterized in that: The discharge port is arranged at the bottom of the center position of the conical or semi-conical ash hopper, and the first continuous material level measuring device is arranged at the center position of the ash hopper.

10. The dust collector hopper material anti-caking warning device according to claim 8, characterized in that: The bottom diameter of the conical or semi-conical ash hopper is L, L1≤1 / 4L, and L2≥1 / 4L.

11. A dust collector hopper anti-caking method, characterized in that: The dust collector hopper material anti-caking warning device according to any one of claims 1 to 10 comprises the following steps: Step 1: The dust collector hopper material anti-caking early warning device measures the material pressures P1 and P2; Step 2: Calculate the deviation between P1 and P2-ρgh3, and compare whether the deviation is greater than the warning value. If the deviation is greater than the warning value, proceed to step 3. Step 3: Increase the fluidizing air injection volume until the deviation between P1 and P2-ρgh3 is less than the warning value.

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