CN215524755U - Solid powder material level detection device - Google Patents
Solid powder material level detection device Download PDFInfo
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- CN215524755U CN215524755U CN202121020599.7U CN202121020599U CN215524755U CN 215524755 U CN215524755 U CN 215524755U CN 202121020599 U CN202121020599 U CN 202121020599U CN 215524755 U CN215524755 U CN 215524755U
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Abstract
The utility model relates to a solid powder material level detection device which comprises a PLC/DCS controller, two compensatory pressure detection components, two pressure transmitters, two quick-cutting valves, two pressure taking pipes and two settling tanks, wherein the PLC/DCS controller is respectively connected with the two pressure transmitters and an adjusting butterfly valve at the lower part of an ash hopper of a dust remover, each pressure transmitter is connected with one settling tank, each settling tank is connected with one quick-cutting valve, each quick-cutting valve is connected with one compensatory pressure detection component, each quick-cutting valve is arranged on one pressure taking pipe, the two pressure taking pipes are respectively arranged on the ash hopper of the dust remover, and the two compensatory pressure detection components are respectively connected with an external air source. The actual material position above the high material level can be obtained by subtracting the detection pressures of the two compensatory pressure detection components and calculating, so that data is provided for DCS/PLC, and the automatic control of circulating ash is realized. The device is applied to the position above the high material level, and when the actual material level is lower than the high material level, the accident easily occurs, and the opening of the butterfly valve is adjusted to be smaller.
Description
The technical field is as follows:
the utility model relates to a solid powder material level detection device.
Background art:
in the desulfurization and dust removal process, the material level of desulfurization and dust removal ash is often detected in wet desulfurization and semi-dry desulfurization. Such level sensing usually employs a radar level gauge at the roof/tank top. The model selection is carried out according to the medium components and factors (including particle size and ash temperature) of ash, and the radar level gauge is continuously improved in the model selection, and adopts a high-frequency mode, a parabolic mode, a belt purging mode and the like. The requirements of the process are met. A conventional tank/silo is schematically measured with a radar level gauge as shown in fig. 1.
However, in the current popular CFB desulfurization dust removal system, the top of the storage bin is a dust remover, the lower part of the storage bin is an ash bucket, and the top of the storage bin cannot be provided with a material level meter, so that the material level of ash in the ash bucket cannot be known. In the process, the desulfurized fly ash in the ash bucket needs to be recycled, and the desulfurized fly ash (the mixture of soda lime, calcium sulfate and calcium sulfite) returns to the desulfurizing tower for reuse through an ash discharge adjusting butterfly valve. And 3 low material level switches are arranged on the side surface of the ash bucket every 0.5 m and are respectively set as a low alarm L, a medium-low alarm LL and an ultra-low alarm LLL. In the normal operating process, the butterfly valve is adjusted to open a certain opening degree during normal operation, circulating ash is blown to the absorption tower by utilizing fluidized air, once an alarm is generated, the opening degree of the butterfly valve is manually adjusted to be smaller, and the opening degree of the butterfly valve is adjusted to be smaller when the alarm is reported in a middle-low mode. In practice, the opening degree of the butterfly valve is adjusted according to the content of sulfur dioxide in the absorption tower, the content of sulfur dioxide after desulfurization and the material level of the ash hopper in the production process. The process flow needs to ensure that the ash hopper has a material level and cannot ensure that the material level is empty. If no material level exists or the ash is emptied, the fluidized air can directly enter the ash hopper to cause accidents. Because the open-loop control is implemented, the operator is required to stare at the operation screen all the time and manually adjust the opening of the butterfly valve. The ash amount can not be adjusted according to the actual requirement of desulfurization, so that the fluidized bed CFB desulfurization and dust removal system is particularly important for detecting the material level of an ash hopper in the actual production process, as shown in figure 2.
The utility model content is as follows:
the utility model aims to overcome the problems in the prior art and provides a solid powder material level detection device, which can detect the material level of desulfurized ash (circulating ash) in an ash hopper, can detect the height of the material level, can adjust the opening of an adjusting valve in a closed loop mode according to the height of the material level, forms double closed loop adjustment by detecting the content of sulfur dioxide in flue gas after desulfurization and the material level, forms feedforward by introducing the content of sulfur dioxide in the flue gas before desulfurization, and forms feedforward-double closed loop adjustment by the whole device, so that the opening of a butterfly valve can be adjusted more accurately, and the full utilization of the circulating ash is ensured. Therefore, the ash hopper material level can be accurately measured, the energy-saving and efficiency-increasing effects can be achieved, and the unattended purpose can be achieved.
The utility model is realized by adopting the following technical principles:
the utility model provides a solid powder material level detection device, includes PLC DCS controller, two compensatory pressure detection component, two pressure transmitters, two fast cut valves, two pressure pipes, two settling casks, its characterized in that: the PLC/DCS controller is respectively connected with two pressure transmitters and an adjusting butterfly valve at the lower part of the ash hopper of the dust remover, each pressure transmitter is connected with a settling tank, each settling tank is connected with a quick-cutting valve, each quick-cutting valve is connected with a compensatory pressure detection component, each quick-cutting valve is installed on a pressure taking pipe, the two pressure taking pipes are respectively installed on the ash hopper of the dust remover, and the two compensatory pressure detection components are respectively connected with an external air source.
The compensatory pressure detection component consists of a flow regulator and a pressure controller, the flow regulator is connected with the quick-cutting valve, and the pressure controller is connected with an external air source.
For convenience of calculation, the vertical direction difference of the pressure taking ports of the two pressure taking pipes arranged on the ash bucket of the dust remover is 0.5-1.5 meters, and the pressure taking ports are generally 1.0 meter.
The actual material position above the high material level can be obtained by subtracting the detection pressures of the two compensatory pressure detection components and calculating, so that data is provided for DCS/PLC, and the automatic control of circulating ash is realized. The device is applied to the position above the high material level, and when the actual material level is lower than the high material level, the accident easily occurs, then adjusts the butterfly valve aperture and diminishes.
Drawings
FIG. 1 is a schematic diagram of a conventional tank/silo measuring using a radar level gauge.
FIG. 2 is a schematic view of the level detection of a lower ash hopper of a conventional dust collector.
FIG. 3 is a schematic diagram of the level detection of the ash hopper of the dust collector of the present invention.
Fig. 4 is a schematic connection diagram of the present invention.
In the figure: 1-radar level indicator, 2-adjusting butterfly valve, 3-manual gate valve and 4-buffer device;
Detailed Description
The utility model is described in further detail below with reference to the figures and the embodiments.
As shown in fig. 3 and 4, the solid powder level detection device of the present invention comprises a PLC/DCS controller, two compensatory pressure detection members, two pressure transmitters, two fast-switching valves, two pressure sampling pipes, and two settling tanks, and is characterized in that: the PLC/DCS controller is respectively connected with two pressure transmitters and an adjusting butterfly valve at the lower part of the ash hopper of the dust remover, each pressure transmitter is connected with a settling tank, each settling tank is connected with a quick-cutting valve, each quick-cutting valve is connected with a compensatory pressure detection component, each quick-cutting valve is installed on a pressure taking pipe, the two pressure taking pipes are respectively installed on the ash hopper of the dust remover, and the two compensatory pressure detection components are respectively connected with an external air source. The compensatory pressure detection component consists of a flow regulator and a pressure controller, the flow regulator is connected with the quick-cutting valve, and the pressure controller is connected with an external air source. The vertical direction difference of the pressure taking ports of the two pressure taking pipes arranged on the ash bucket of the dust remover is 1.0 meter.
The pressure is measured on the side surface of the ash bucket of the bag-type dust collector, and a compensatory pressure detection component is arranged for preventing blockage. The principle of the compensatory pressure detection member is to utilize Bernoulli equation P1+1/2 rho v12+ rho gh1 ═ P2+1/2 rho v22+ rho gh2+ HW, and it can be seen from the above that the pressure loss H of the pipeline is ignoredWAs shown in FIG. 4, the pressure A point at the ash bucket pressure taking position on the communicating pipe and the pressure measured by the pressure transmitter A1Are equal. The pressure measured at pressure transmitter a1 can be considered to be the pressure at point a. The condition is that the rear ash of the bag-type dust collector is dry ash which has fluidity. The device is generally provided with steam heat tracing on the inner side of the ash hopper, so that the ash is ensured not to be caked and has fluidity.
The detection scheme is that the pressure of the point A and the pressure of the point B are respectively measured at the position A and the position B which are above the bottom of the ash hopper and on the side part of the ash hopper of the dust remover, and for the convenience of calculation, the vertical height difference of the point AB and the point AB is 1 meter. Pressure P at AAAnd the pressure at B is PB。
As shown in FIG. 4, the pressures at A, B are measured as PA，PB
PB＝§ρgH1
PA＝§ρg(H1+H2)H1+H2＝PA/(§ρg)
The total coefficient of ash buckets (the factors such as the shape coefficient, the dryness degree and the dielectric constant of the ash buckets), ρ is the density of ash, g is the gravity acceleration, H1 is the height of the ash above the ash bucket B of the dust remover, and H2 is the distance between two points A B.
In actual installation, H2 is fixed to be 1.0 meter, pressures at A, B are measured by a pressure transmitter, and a differential pressure Δ P is PA-PB＝§ρg
Height H1+ H2P of ash at AA/(§ρg)＝PA/(PA-PB)
The actual height H + phi of the ash bucket is calculated from the lower part of the ash bucket. Phi is the height from the ash bucket bottom at the low-pressure detection part A.
The specific implementation requirements are as follows: the lateral surfaces of an ash bucket of the dust remover are respectively provided with a pressure detection component with compensation, the pressure position at the low material level A is arranged at a certain height away from the ash bucket, and the vertical height difference between the pressure detection at the high material level B and the pressure detection at the low material level A is 1 meter. The front end of the purging sampling head retracts to the surface of the ash hopper by 200mm and inclines downwards by a certain 30 degrees.
The particle diameter of the air source of the blowing compressed air is required to be not more than 3 mu m for a common pneumatic instrument, and the dust content is required to be less than 1mg/m3(ii) a Does not contain corrosive gas.
The pressure pipeline connection adopts a phi 14X 2 seamless steel pipe, a stainless steel pipe or a metal hose for connection (welding), before use, compressed air is needed to sweep and clean the garbage and dust in the pipe, and the cleanness in the pipeline is ensured; the welded place between pipelines must be welded without air leakage, and the connecting part is added with a sealing gasket to ensure that each connecting point has no air leakage.
Before the device is put into use for the first time, the garbage, welding slag impurities and the like in the pipeline need to be cleaned, and a clean air source is ensured. The pressure regulating controller is closed before the first operation, the air pressure value of the ash bucket is measured, the fluctuation condition of the ash bucket is observed, and the accurate measurement of the ash bucket is not influenced when no blowing is carried out. After the production system is stable, slowly turning on the pressure regulating and stabilizing device to ensure that the metal ball in the flow regulator is in the central position of the rotameter, namely, the flow is regulated to be 1-1.5 m3/h。
Because the device needs to calculate, the measured pressures at the high material level and the low material level need to be calculated in a PLC/DCS system.
When the pressure detected by the high material level is a negative value, which indicates that the material level is very low, the circulating ash is automatically reduced, and the opening of the butterfly valve is adjusted to be reduced. If the originally opened adjusting butterfly valve is continued, accidents can be caused.
The utility model has the beneficial effects that: the material level in the ash bucket of the dust remover can be measured, the utilization amount of the circulating ash is adjusted, namely, the raw material soda lime is fully utilized, automatic control is realized, the raw material is saved, the labor is saved, and the labor intensity is reduced.
Claims (3)
1. The utility model provides a solid powder material level detection device, includes PLC DCS controller, two compensatory pressure detection component, two pressure transmitters, two fast cut valves, two pressure pipes, two settling casks, its characterized in that: the PLC/DCS controller is respectively connected with two pressure transmitters and an adjusting butterfly valve at the lower part of the ash hopper of the dust remover, each pressure transmitter is connected with a settling tank, each settling tank is connected with a quick-cutting valve, each quick-cutting valve is connected with a compensatory pressure detection component, each quick-cutting valve is installed on a pressure taking pipe, the two pressure taking pipes are respectively installed on the ash hopper of the dust remover, and the two compensatory pressure detection components are respectively connected with an external air source.
2. The solid powder level detecting device according to claim 1, wherein: the compensatory pressure detection component consists of a flow regulator and a pressure controller, the flow regulator is connected with the quick-cutting valve, and the pressure controller is connected with an external air source.
3. The solid powder level detecting device according to claim 1, wherein: the vertical direction of the pressure taking ports of the two pressure taking pipes arranged on the ash bucket of the dust remover has a difference of 0.5-1.5 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121020599.7U CN215524755U (en) | 2021-05-13 | 2021-05-13 | Solid powder material level detection device |
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| CN202121020599.7U CN215524755U (en) | 2021-05-13 | 2021-05-13 | Solid powder material level detection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984667A (en) * | 2022-06-08 | 2022-09-02 | 北票发电有限责任公司 | Negative pressure dust removal device and method thereof |
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2021
- 2021-05-13 CN CN202121020599.7U patent/CN215524755U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114984667A (en) * | 2022-06-08 | 2022-09-02 | 北票发电有限责任公司 | Negative pressure dust removal device and method thereof |
| CN114984667B (en) * | 2022-06-08 | 2024-04-23 | 北票发电有限责任公司 | Negative pressure dust removing device and method thereof |
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