Hopper material level detection and discrimination device

Abstract

The utility model discloses a hopper material level detection and discrimination device. Comprising a reference pressure measuring point (X1), a reference pressure measuring pipeline (P1), a material level measuring pressure measuring point (X2), a material level measuring pressure measuring pipeline (P2), a material level detecting and measuring instrument (P) and a material level indicating and alarming device or a control system program control component device (CP), wherein the reference pressure measuring point (X1) is arranged in a designed and determined area where the material level change cannot reach in a hopper; the material level measurement pressure measuring point (X2) is arranged in a specified area in a material level change interval determined by design in the hopper; and the material level detecting and measuring instrument (P) is connected with a material level indicating and alarming device or a control system program control component device (CP). According to the utility model, no running part is arranged, so that the abrasion of the detection equipment is avoided, the limitation of environmental adaptability is effectively overcome by adopting an indirect non-contact detection and judgment method, and the application range is expanded.

Description

Technical Field

[0001] The utility model relates to a hopper material level detection and discrimination device, which is particularly suitable for making a point - type judgment of the presence or absence of the material level in a hopper under toxic, harmful, corrosive and high - temperature environmental conditions without precise measurement requirements for the material level, and giving a switch signal indicating the presence or absence of the material level. Background Art

[0002] Level gauges, level detection devices or level detection instruments are widely used in the production process detection and control systems of many industries and fields such as petrochemical, plastics, cement, medicine, feed, food, metallurgy, light industry, building materials, environmental protection, etc. They participate in the automatic control of the production process, realize the control of the material level during the storage and transportation of materials and the alarm and indication of setting the material level limit, and their uses are extensive and they are indispensable and extremely important automatic components in the production process detection and control system.

[0003] Currently, there are various types of well - known level detection methods and detection devices, each with its own characteristics.

[0004] According to the detection principle and method, there are mechanical and electro - electrical types; according to the relationship between the detection device and the measured material, there are contact - type and non - contact - type.

[0005] Mechanical type such as the heavy - hammer type and the resistance - rotation type and other level detection devices have mechanical rotating parts, and the detection parts are in contact with the measured material.

[0006] In the well - known mechanical level detection methods and level detection devices that are in contact with the measured material, there are moving parts, and severe wear and corrosion seriously affect the reliability and durability of the level detection device.

[0007] Electro - electrical type such as capacitive, radio - frequency admittance type, tuning fork type and vibrating rod type and other level detection devices for powder materials utilize the change of electrical signals during the level detection process, and the detection parts are also in contact with the measured material during the working process; electro - electrical type level detection devices such as radar and ultrasonic type and other level detection devices utilize the echo signals of radio signals / ultrasonic signals, and they achieve non - contact between the detection parts and the measured material during the working process, but the echoes of radar and ultrasonic waves will be affected by factors such as the shape of the equipment such as the silo and hopper, airtightness, internal dust and the shape of the material accumulation surface.

[0008] The electro - physical and chemical properties of the measured material have a greater impact on the detection accuracy of electro - electrical type level detection devices such as capacitive, radio - frequency admittance type, tuning fork type and vibrating rod type and other level detection devices. Due to contact with the measured material, the change of the material level and the movement of the material in the material storage and transportation equipment such as silos and hoppers will also cause wear to them.

[0009] Electrical and electronic non-contact level detection devices such as radar and ultrasonic level detection devices are also affected by the irregular cross-section of the material level in material storage and transfer equipment such as bins and hoppers, and by the spatial media such as dust in the empty space in bins and hoppers; moreover, these detection devices are also restricted by the high temperature of the material in material storage and transfer equipment such as bins and hoppers, and the corrosion and explosion and fire application environments of the material and the remaining space also limit their use.

[0010] There is also a type of radiation level gauge and level switch that measures the material level by the attenuation of rays passing through the material, which is also a device non-contact with the measured material; although the radiation level gauge and level switch are non-contact with the measured material and are accurate and reliable, their use environment is strictly restricted due to radiation safety considerations. Summary of the Invention

[0011] The utility model provides a hopper level detection and discrimination device aiming at the deficiencies existing in the prior art.

[0012] The technical solution of the utility model is: a hopper level detection and discrimination device, including a reference pressure tapping point, a reference pressure tapping pipeline, a level measurement pressure tapping point, a level measurement pressure tapping pipeline, a level detection and measurement instrument, a level indication and alarm device or a control system program control component device. The reference pressure tapping point is set in an area in the hopper where the change of the designed material level cannot reach; the level measurement pressure tapping point is set in a specified area within the designed change interval of the material level in the hopper; the level detection and measurement instrument is connected to the reference pressure tapping point through the reference pressure tapping pipeline; the level detection and measurement instrument is connected to the level measurement pressure tapping point through the level measurement pressure tapping pipeline; the level detection and measurement instrument is connected to the level indication and alarm device or the control system program control component device.

[0013] Further, the level detection and measurement instrument is a pressure / differential pressure detection and measurement instrument, a sensor or a transmitter.

[0014] Further, the reference pressure tapping pipeline and the level measurement pressure tapping pipeline are respectively connected to an auxiliary air source component.

[0015] Further, the auxiliary air source component includes an auxiliary intake pipe, an auxiliary intake valve, a reference auxiliary intake valve, and a measurement auxiliary intake valve.

[0016] A hopper level detection and discrimination method, the steps of which include:

[0017] (1) Set a change interval of the material level in the bin or hopper;

[0018] (2) Divide the change interval of the material level into a specified area and an area where the change of the material level cannot reach;

[0019] (3) Pressure / differential pressure transmitters or sensors are respectively installed at the specified areas and areas where the change of material level cannot reach, that is, the reference pressure tapping points and the pressure tapping points for material level measurement;

[0020] (4) A material level detection and measurement instrument, that is, a pressure / differential pressure transmitter or sensor, is installed and arranged between the reference pressure tapping point and the pressure tapping point for material level measurement;

[0021] (5) Obtain the pressure / differential pressure signal between the reference pressure tapping point and the pressure tapping point for material level measurement during the change of material level in the silo or hopper by the pressure / differential pressure transmitter or sensor;

[0022] (6) The pressure / differential pressure signal is judged and operated through the control detection and judgment logic program of the control system to determine whether there is material between the measurement ranges of the reference pressure tapping point and the pressure tapping point for material level measurement in the silo or hopper;

[0023] (7) Confirm the material level signal of the silo or hopper according to the permeability of whether the measurement gas path between the reference pressure tapping point and the pressure tapping point for measurement is blocked by the measured material.

[0024] The control detection and judgment logic in step (6) is executed by the material level indicating and alarming device, and the pressure / differential pressure signal during the change of material level in the silo or hopper obtained by the material level detection and measurement instrument enters the material level indicating and alarming device; the material level indicating and alarming device conducts logical discrimination on the material level signal in the silo or hopper according to the real-time online detected pressure / differential pressure signal to form the material level signal in the silo or hopper; the material level signal transmits the material level signal of the silo or hopper to the upper control system program control component or computer, and participates in the control process of the upper control system program control component device or computer.

[0025] The control detection and judgment logic in step (6) is executed by the upper control system program control component device. The pressure / differential pressure signal during the change of material level in the silo or hopper obtained by the material level detection and measurement instrument enters the upper control system program control component device; the upper control system program control component device conducts logical discrimination on the material level signal in the silo or hopper according to the real-time online detected pressure / differential pressure signal to form the material level signal in the silo or hopper; the material level signal is adopted by the upper control system program control component device and participates in the control process of the upper control system program control component device or computer; the upper control system program control component device or computer manages, indicates and alarms the material level signal in the silo or hopper; the upper control system program control component device sends the material level signal of the silo or hopper to the site.

[0026] The detection and judgment logic program in step (3) is as follows:

[0027] When there is no material level, there is no material blockage in the gas path between the material level measurement pressure tapping point and the reference pressure tapping point, forming a gas path short circuit and the gas path is unobstructed. The measured value of the material level detection measuring instrument is zero;

[0028] When there is a material level, the reference pressure tapping point is connected to the silo hopper, and the material level measurement pressure tapping point is blocked by the material. Therefore, a pressure difference is formed due to the blockage of the gas path between the material level measurement pressure tapping point and the reference pressure tapping point. The measured value of the material level detection measuring instrument is the pressure difference between the material level measurement pressure tapping point and the reference pressure tapping point;

[0029] Once the material level detection measuring instrument measures the pressure difference value, it can be determined that the material level in the silo hopper has risen to the position of the set material level measurement pressure tapping point;

[0030] By reading and judging the measured value of the material level detection measuring instrument, the pressure difference between the material level measurement pressure tapping point and the reference pressure tapping point, the material level in the silo hopper is judged and determined.

[0031] The introduction of the auxiliary measurement gas source ensures the stability, accuracy and continuity of the measurement and judgment. Regardless of the working state of the silo hopper, when there is no material level in the silo hopper, the auxiliary measurement gas source has no influence on the measurement and judgment. When there is a material level, the auxiliary measurement gas source plays a role in stabilizing the pressure of the material level measurement pressure tapping point.

[0032] The present utility model adopts the means of detecting the pressure / differential pressure between the reference pressure tapping point and the measurement pressure tapping point in the silo hopper. Utilizing the indirect conduction effect of pressure, the pressure / differential pressure value between the reference pressure tapping point and the measurement pressure tapping point is read. According to the pressure / differential pressure value between the reference pressure tapping point and the measurement pressure tapping point, it is judged whether the measurement gas path between the reference pressure tapping point and the measurement pressure tapping point in the silo hopper or the material storage and transfer equipment, that is, within the measurement range, is permeable due to material blockage to determine the presence or absence of the material, and thus determine whether the material in the silo hopper has risen to the position of the measurement pressure tapping point to obtain the material level signal.

[0033] The basic solution idea of the present utility model is to detect the permeability of the detection gas path between the reference pressure tapping point and the measurement pressure tapping point, detect whether the gas path is short-circuited, and whether the reference pressure tapping point and the measurement pressure tapping point are blocked by the accumulation of the detected material during the change of the material level in the silo hopper to determine the material level in the silo hopper; in order to ensure the continuity and stability of the measurement and judgment under working conditions such as the shutdown of the process equipment, an auxiliary measurement gas source is also introduced.

[0034] The present utility model has the following technical features:

[0035] (1) The utility model utilizes the means of indirectly detecting the pressure / differential pressure between the reference pressure tapping point and the measurement pressure tapping point in the silo hopper by the indirect action of pressure conduction. It detects the permeability of the compressed air passage in the detection air path between the reference pressure tapping point and the measurement pressure tapping point, and judges whether the reference pressure tapping point and the measurement pressure tapping point are blocked by the detected material or whether the detection air path is short-circuited during the change of the material level in the silo hopper. It uses an indirect detection and discrimination device.

[0036] (2) The utility model adopts a non-contact detection and discrimination device. It obtains the pressure / differential pressure value between the reference pressure tapping point and the measurement pressure tapping point through conventional detection instruments such as differential pressure / pressure sensors and transmitters, and determines the material level in the silo hopper by judging the permeability of the compressed air passage between the reference pressure tapping point and the measurement pressure tapping point in the silo hopper and whether the detection air path is short-circuited or blocked.

[0037] Compared with some known detection equipment for detecting the material level (such as the resistance rotation type, etc.), the utility model has no mechanical loss and wear components and devices in operation.

[0038] The utility model is particularly suitable for making a point-type judgment of the presence or absence of the material level in the silo hopper under toxic, harmful, corrosive and high-temperature environmental conditions when there is no precise measurement requirement for the material level, and giving a switch signal indicating the presence or absence of the material level. This material level signal can be used for system control to participate in the control of the production process control system, and can be used to indicate and alarm the material level in the silo hopper.

[0039] The beneficial technical effects of the utility model are:

[0040] (1) Using an indirect detection and discrimination device, it detects the differential pressure / pressure between the reference pressure tapping point and the measurement pressure tapping point obtained by the indirect conduction of pressure. The judgment basis is the permeability of the detection air path, whether the detection air path is short-circuited, and whether the reference pressure tapping point and the measurement pressure tapping point are blocked by the detected material during the change of the material level in the silo hopper to determine the material level in the silo hopper. Therefore, the utility model uses an indirect detection and discrimination device, which is simple and direct, and the detection result is reliable and credible. Moreover, the utility model uses common detection instruments such as differential pressure / pressure sensors and transmitters, the devices are easy to obtain, the price is low, and the maintenance and management are simple.

[0041] (2) An indirect non-contact detection and discrimination device is adopted, which avoids the contact between the measuring device / components and the material to be measured during the detection process; it avoids factors such as abrasion and corrosion of the detection components that are not conducive to the detection sensitive elements; it isolates the influence of the electrical and physical-chemical properties of the material to be measured and the dust inside the closed space of the silo and hopper on the measurement; the adopted indirect non-contact detection and discrimination device also avoids the abrasion, erosion and impact caused by the material to be measured to the detection equipment and components, which can greatly improve the reliability and durability of the detection process and effectively reduce the operation, maintenance and repair costs.

[0042] (3) The utility model has no rotating components and devices, which avoids the abrasion of the detection equipment itself, improves the reliability and durability of the detection equipment itself during the detection process, and can effectively reduce the operation, maintenance, repair and management costs.

[0043] (4) The indirect non-contact detection and discrimination device adopted by the utility model effectively overcomes the limitations of environmental adaptability, expands the application range, can be applied to high-temperature materials, corrosive and abrasive materials, and can adapt to the use in corrosive environmental conditions in the silo and hopper; moreover, the indirect measurement characteristic is particularly suitable for the measurement application environment where the silo, hopper and their materials have the properties of fire and explosion.

[0044] (5) The introduced auxiliary measurement air source ensures the stability, accuracy and continuity of the measurement and judgment; specifically, first, during the production process, the pressure (negative pressure or positive pressure) inside the silo and hopper will fluctuate with the production process, and the introduction of the auxiliary measurement air source ensures the stability of the measurement value; second, when the production equipment such as the silo and hopper is shut down or paused, the internal pressure is uncertain, and sometimes it is necessary to monitor the material level inside it. The introduction of the auxiliary measurement air source not only ensures the stability of the measurement value, but also ensures the continuity of the measurement; third, when encountering high-temperature measurement situations, the introduced auxiliary measurement air source can also be used as an auxiliary cooling measure to reduce the temperature of the measurement pipeline and pressure tapping points and other pressure-taking facilities; moreover, when the measurement pipeline and pressure tapping points need to be cleaned and purged, the auxiliary measurement air source can also be used as the purging and cleaning air source for the measurement pipeline and pressure tapping points. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural diagram of Embodiment 1 of a material level detection and discrimination device.

[0046] Figure 2 It is a structural diagram of Embodiment 2 of a material level detection and discrimination device.

[0047] Figure 3 It is a structural diagram of Embodiment 3 of a material level detection and discrimination device.

[0048] Figure 4 It is a structural diagram of Embodiment 4 of a material level detection and discrimination device.

[0049] Figure 5 It is a structural diagram of Embodiment 5 of a material level detection and discrimination device.

[0050] In the figure: (1) Each component of the silo hopper of the process production equipment: 1 - Dust source point dust removal and extraction point; 2 - Dust-containing flue gas pipeline at the inlet of the dust collector; 3 - Dust collector; 4 - Dust hopper of the dust collector; 5 - Clean flue gas pipeline at the outlet of the dust collector; 6 - Fan of the dust removal system; 7 - Clean flue gas discharge pipeline of the dust removal system;

[0051] (2) Each component of the material level detection and discrimination system / devices: X1. Reference pressure tapping point; P1. Reference pressure tapping pipeline; X2. Material level measurement pressure tapping point; P2. Material level measurement pressure tapping pipeline; △P. Material level detection and measurement instrument (pressure / differential pressure detection and measurement instrument, sensor or transmitter); CP. Material level indication and alarm device or program control component device of the control system. Detailed implementation mode

[0052] The present utility model will be further described below with reference to the accompanying drawings.

[0053] A material level detection and discrimination device includes a reference pressure tapping point X1, a reference pressure tapping pipeline P1, a material level measurement pressure tapping point X2, a material level measurement pressure tapping pipeline P2, a material level detection and measurement instrument △P, and a material level indication and alarm device or a program control component device CP of the control system. The reference pressure tapping point X1 is arranged in an area where the change of the material level in the hopper cannot reach as designed; the material level measurement pressure tapping point X2 is arranged in a designated area within the range of the change of the material level in the hopper as designed; the material level detection and measurement instrument △P is connected to the reference pressure tapping point X1 through the reference pressure tapping pipeline P1; the material level detection and measurement instrument △P is connected to the material level measurement pressure tapping point X2 through the material level measurement pressure tapping pipeline P2; the material level detection and measurement instrument △P is connected to the material level indication and alarm device or the program control component device CP of the control system.

[0054] In the specified area within the determined material level change range and the area where the material level change in the silo hopper cannot reach, pressure / differential pressure transmitters or pressure sensors are respectively set at the pressure tapping points, namely the reference pressure tapping point and the measurement pressure tapping point; a pressure / differential pressure transmitter or pressure sensor is installed and arranged between the reference pressure tapping point and the measurement pressure tapping point; the pressure / differential pressure signal between the reference pressure tapping point and the measurement pressure tapping point during the material level change in the silo hopper is obtained by the pressure / differential pressure transmitter or pressure sensor; the pressure / differential pressure signal is subjected to logical discrimination and operation by the control system program control component device or the material level indicating and alarming device composed of the device provided by the present utility model to judge the presence or absence of the material between the reference pressure tapping point and the measurement pressure tapping point (measurement range) in the silo hopper; the material level signal of the silo hopper is confirmed according to the permeability of whether the measurement gas path between the reference pressure tapping point and the measurement pressure tapping point is blocked by the measured material; in order to maintain the stability and continuity of the measurement process, an auxiliary measurement gas source can also be introduced in the technical solution of the present utility model. Figure 1 What is shown is the basic composition, principle and detection and discrimination logic of the technical solution and technical measures for material level detection and judgment described in the present utility model.

[0055] The reference pressure tapping point takes pressure samples from the area where the material in the material storage and transfer equipment such as the silo hopper cannot reach; the measurement pressure tapping point takes pressure samples from the detection points set in the material change area in the material storage and transfer equipment such as the silo hopper; through the indirect conduction effect of pressure, the material level detection and measurement instrument (pressure / differential pressure detection and measurement instrument, sensor or transmitter) performs real-time on-line detection of the pressure / differential pressure between the reference pressure tapping point and the measurement pressure tapping point.

[0056] At this time, (1) the detection and judgment logic can be controlled by the material level indicating and alarming device. The pressure / differential pressure signal of the material in the silo hopper obtained by the material level detection and measurement instrument during the material level change enters the material level indicating and alarming device. The material level indicating and alarming device performs logical discrimination on the material level signal in the silo hopper according to the real-time on-line detected pressure / differential pressure signal to form the material level signal in the silo hopper; the material level signal can directly transmit the material level signal of the silo hopper to the upper control system program control component device or computer and participate in the control process of the upper control system program control component device or computer; the material level indicating and alarming device can also realize functions such as local indication and local alarm of the material level in the silo hopper and the upload of the direct material level signal.

[0057] At this time, or it is also possible (2), the control detection judgment logic is executed by the upper control system program control component device, and the pressure / pressure difference value signal of the material in the silo hopper during the material level change process obtained by the material level detection measuring instrument enters the upper control system program control component device; the upper control system program control component device performs logical judgment on the material level signal in the silo hopper according to the real-time online detection pressure / pressure difference value signal to form the material level signal in the silo hopper; the material level signal can be directly adopted by the upper control system program control component device and participate in the control process of the upper control system program control component device or computer; the upper control system program control component device or computer manages, indicates and alarms the material level signal in the silo hopper; the upper control system program control component device can also send the material level signal of the silo hopper to the site, so as to realize the functions of on-site indication and on-site alarm of the material level.

[0058] Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The “silo hopper” and other process system equipment in each figure are constructed according to the material level measurement system / device of the dust collector (bag type) hopper of the dust removal system, and the “silo hopper” and other process system equipment in each figure include but not only refer to the dust collector (bag type) hopper of the dust removal system.

[0059] Figure 1 The components include but are not limited to: (1) Process production equipment, silos, hoppers or material storage and transfer equipment components: 1. Dust source point dust removal and ventilation point; 2. Dust collector inlet dust-containing flue gas duct; 3. Dust collector (bag type); 4. Dust collector ash hopper; 5. Dust collector outlet clean flue gas duct; 6. Dust removal system fan; 7. Dust removal system clean flue gas discharge duct;

[0060] (2) Components of the material level detection and identification system / device: X1. Reference pressure point; P1. Reference pressure pipeline; X2. Material level measurement pressure point; P2. Material level measurement pressure pipeline; △P. Material level detection measuring instrument (pressure / differential pressure detection measuring instrument, sensor or transmitter); CP. Material level indication alarm device or control system program control component device.

[0061] Figure 1 What is achieved is an embodiment of fill level measurement at one filling point.

[0062] X1 and X2 are the reference pressure tapping point and the material level measurement pressure tapping point respectively. The reference pressure tapping point X1 is set in an area where the change of the material level in the silo hopper cannot reach as determined by the design. The material level measurement pressure tapping point X2 is set in a designated area within the range of the change of the material level in the dust collector hopper 4 as determined by the design; △P is a material level detection and measurement instrument (pressure / differential pressure detection and measurement instrument, sensor or transmitter), and its function is to measure the pressure or differential pressure between the reference pressure tapping point X1 and the material level measurement pressure tapping point X2 by utilizing the indirect conduction of pressure. The detected pressure or differential pressure signal is used as the basis for judging whether there is a material level in the material storage and transfer equipment 4 such as the silo hopper; P1 and P2 are the reference pressure tapping pipeline and the material level measurement pressure tapping pipeline respectively, which are used for the pipeline connection between the reference pressure tapping point X1, the material level measurement pressure tapping pipeline and the material level detection and measurement instrument △P; CP is a material level indication and alarm device or a control system program control component device; in order to ensure the stable, accurate and continuous measurement and judgment, especially when the material storage and transfer equipment such as the silo hopper is in a pressurized state and a start-stop operation state, an auxiliary measurement air source can also be introduced.

[0063] The pressure or differential pressure signal between the reference pressure tapping point X1 and the material level measurement pressure tapping point X2 detected by the material level detection and measurement instrument △P can (1) enter the material level indication and alarm device CP constituted according to the device and control logic to realize the local or centralized indication, alarm of the material level in the silo hopper and transmit the material level signal to the upper-level control system to participate in the system control; it can also (2) be transmitted to the control system program control component device, and the control system program control component device executes the tasks that the material level indication and alarm device CP constituted according to the device and control logic needs to complete. The obtained material level signal in the silo hopper can be directly used by the control system program control component device and participate in the system control, indication and alarm.

[0064] The control, detection and judgment logic of the material level indication and alarm device CP or the control system program control component device is as described below.

[0065] (1) When there is no material level, there is no material blockage in the gas path between the material level measurement pressure tapping point X2 and the reference pressure tapping point X1, forming a gas path short circuit and the gas path is unobstructed. The measured value of the material level detection and measurement instrument △P is zero.

[0066] (2) When there is a material level, the reference pressure tapping point X1 is connected to the process equipment such as the hopper and the silo, and the material level measurement pressure tapping point X2 is blocked by the material. Therefore, a pressure difference is formed due to the blockage of the gas path between the material level measurement pressure tapping point X2 and the reference pressure tapping point X1. The measured value of the material level detection and measurement instrument △P is the pressure difference between the material level measurement pressure tapping point X2 and the reference pressure tapping point X1.

[0067] Once the differential pressure ΔP of the level detection measuring instrument measures the differential pressure value, it can be determined that the material level in the silo hopper has risen to the position of the set level measurement pressure tapping point X2 (a slightly higher position, which varies according to different material densities, particle sizes, and air permeability).

[0068] (4) In this way, by reading and judging the measured value of the level detection measuring instrument ΔP (the differential pressure between the level measurement pressure tapping point X2 and the reference pressure tapping point X1), the material level in the silo hopper can be judged and determined.

[0069] (5) The introduction of the auxiliary measurement air source ensures the stability, accuracy, and continuity of the measurement and judgment. Regardless of the working state of the silo hopper, when there is no material level in the silo hopper, the auxiliary measurement air source has no influence on the measurement and judgment. When there is a material level, the auxiliary measurement air source plays a role in stabilizing the pressure at the level measurement pressure tapping point X2.

[0070] Figure 2 Example 2 shown. This example can be referred to in the case of multi-point level measurement of materials in the silo hopper, such as high level, medium level, and low level.

[0071] Figure 2 Each component in includes but is not limited to:

[0072] (1) Each component of the material storage and transfer equipment such as the silo hopper of the process production equipment: 1. Dust source point dust extraction point; 2. Inlet dust-containing flue gas pipeline of the dust collector; 3. Dust collector (bag type); 4. Dust hopper of the dust collector; 5. Outlet clean flue gas pipeline of the dust collector; 6. Dust removal system fan; 7. Clean flue gas discharge pipeline of the dust removal system;

[0073] (2) Each component of the level detection and discrimination system / device: X1. Reference pressure tapping point; P1. Reference pressure tapping pipeline; X2(H, M, L). Level measurement pressure tapping point (high, medium, and low levels); P2(H, M, L). Level measurement pressure tapping pipeline (high, medium, and low levels); ΔP(H, M, L). Level detection measuring instrument (pressure / differential pressure detection measuring instrument, sensor or transmitter, high, medium, and low levels); CP. Level indication and alarm device (or control system program control component device).

[0074] Figure 2 Each of the components 1, 2, 3, 4, 5, 6, and 7 in is the equipment of the production process system and Figure 1 is the same, and the reference pressure tapping point X1 and the reference pressure tapping pipeline P1 are also the same as Figure 1 is the same; Figure 2 and Figure 1In contrast, the differences are as follows: (1) The pressure tapping points X2 (H, M, L) for level measurement are installed with high, medium, and low level settings on material storage and transfer equipment such as silos and hoppers, corresponding to the high-level pressure tapping point X2H, the medium-level pressure tapping point X2M, and the low-level pressure tapping point X2L respectively; (2) The level measurement pressure tapping pipelines P2 (H, M, L) are designed and installed corresponding to the level measurement pressure tapping points X2 (H, M, L), corresponding to the high-level pressure tapping pipeline P2H, the medium-level pressure tapping pipeline P2M, and the low-level pressure tapping pipeline P2L respectively; (3) The level detection and measurement instruments (pressure / differential pressure detection and measurement instruments, sensors or transmitters) △P (H, M, L) are equipped corresponding to high, medium, and low levels respectively, corresponding to the high-level detection and measurement instrument △PH, the medium-level detection and measurement instrument △PM, and the low-level detection and measurement instrument △PL respectively; and (4) The CP level indication alarm device or the control system program control component device, and CP adopts a multi-signal channel configuration.

[0075] Figure 2 The control detection and judgment logic of the illustrated embodiment and Figure 1They are the same in principle. During the operation of the silo hopper, the reference pressure tapping point X1 is connected to process equipment such as the ash hopper and the silo; when there is a material level in the silo hopper, as the material level gradually rises, the low material level measurement pressure tapping point X2L is blocked by the material. The low material level measurement pressure tapping point X2L forms an air path block due to the blockage of the material. At this time, a pressure difference is formed in the air path between the low material level measurement pressure tapping point X2L and the reference pressure tapping point X1 due to the blockage of the material. The level detection measuring instrument △PL measures the pressure difference between the material level measurement pressure tapping point X2L and the reference pressure tapping point X1. The CP material level indication alarm device or the control system program control component device judges and determines the low material level of the material in the dust collector ash hopper 4 according to the pressure difference measured by △PL; as the material level continuously and gradually rises, the medium material level measurement pressure tapping point X2M is blocked by the material. The medium material level measurement pressure tapping point X2M forms an air path block due to the blockage of the material. At this time, a pressure difference is formed in the air path between the medium material level measurement pressure tapping point X2M and the reference pressure tapping point X1 due to the blockage of the material. The level detection measuring instrument △PM measures the pressure difference between the material level measurement pressure tapping point X2M and the reference pressure tapping point X1. The CP material level indication alarm device or the control system program control component device judges and determines the medium material level of the material in the silo hopper according to the pressure difference measured by △PM; similarly, as the material level continues to rise, the high material level measurement pressure tapping point X2H is blocked by the material. The high material level measurement pressure tapping point X2H forms an air path block due to the blockage of the material. At this time, a pressure difference is formed in the air path between the high material level measurement pressure tapping point X2H and the reference pressure tapping point X1 due to the blockage of the material. The level detection measuring instrument △PH measures the pressure difference between the high material level measurement pressure tapping point X2H and the reference pressure tapping point X1. The CP material level indication alarm device or the control system program control component device judges and determines the high material level of the material in the silo hopper according to the pressure difference measured by △PH.

[0076] Figure 3 In the shown embodiments, an auxiliary measurement air source is introduced. The purpose of introducing the auxiliary measurement air source is to ensure the stability, accuracy and continuity of measurement and judgment, especially in the case where the pressure-bearing state of the silo hopper is different under various operating conditions of starting and stopping.

[0077] Figure 3 Each component in it includes but is not limited to:

[0078] (1) Each component of the process production equipment silo hopper or the material storage and transfer equipment: 1. The dust extraction point of the dust source; 2. The dust-containing flue gas pipeline at the inlet of the dust collector; 3. The dust collector (bag type); 4. The dust collector ash hopper; 5. The clean flue gas pipeline at the outlet of the dust collector; 6. The dust removal system fan; 7. The clean flue gas discharge pipeline of the dust removal system.

[0079] (2) Components of the material level detection and identification system / device: X1. Reference pressure point; P1. Reference pressure pipeline; X2. Material level measurement pressure point; P2. Material level measurement pressure pipeline; △P. Material level detection measuring instrument (pressure / differential pressure detection measuring instrument, sensor or transmitter); CP. Material level indication alarm device (or control system program control component device).

[0080] (3) Components of auxiliary measuring gas source: 1ATS.1# auxiliary measuring gas source; 1AP.1# auxiliary air intake pipe; 1AV.1# auxiliary air intake valve; 2ATS.2# auxiliary measuring gas source; 2AP.2# auxiliary air intake pipe; 2AV.2# auxiliary air intake valve; 3AP. auxiliary measuring pipe; AV1. reference auxiliary air intake valve; AV2. measuring auxiliary air intake valve.

[0081] Figure 3 An auxiliary measuring gas source is introduced in the measurement of the embodiment shown. The purpose of introducing the auxiliary measuring gas source is to ensure the stability, accuracy and continuity of the measurement judgment, especially when the pressure state of the silo hopper is inconsistent during the start, stop and operation conditions.

[0082] In addition to the additional auxiliary measurement gas source components, Figure 3 Other components and Figure 1 Same.

[0083] Among the components of the auxiliary measurement gas source, 1ATS and 2ATS are respectively the 1# auxiliary measurement gas source and the 2# auxiliary measurement gas source. During the normal operation of the measurement system / device, only one of the auxiliary measurement gas sources is used. Figure 3 The auxiliary measuring gas source 1ATS is used, and Figure 3 The 1# auxiliary measuring gas source 1ATS used in the process is introduced from the clean flue gas discharge pipe 7 of the dust removal system; 1AP and 2AP are the 1# auxiliary air intake pipe and the 2# auxiliary air intake pipe respectively; AV1 and AV2 are the reference auxiliary air intake valve and the measuring auxiliary air intake valve respectively; 3AP is the auxiliary measuring pipe.

[0084] Figure 3 The control detection judgment logic and Figure 1 The principles are the same; the difference is that an auxiliary measuring gas source is introduced to ensure the stability of the reference pressure of the material level measurement pressure point X2 and the reference pressure point X1.

[0085] (1) When there is no material level, there is no material blocking the gas path between the material level measurement pressure point X2 and the reference pressure point X1 to form a short circuit, and the gas path is unobstructed. The pressure of the auxiliary measurement gas source has no effect on the pressure of either the material level measurement pressure point X2 or the reference pressure point X1.

[0086] When there is a material level, the reference pressure tapping point X1 is connected to process equipment such as the ash hopper and the silo. At this time, the pressure at the reference pressure tapping point X1 comes from the working pressure of the process equipment such as the ash hopper and the silo and the pressure of the auxiliary measurement gas source; the material level measurement pressure tapping point X2 is blocked by the material. At this time, due to the blockage of the material at the material level measurement pressure tapping point X2, an air path blockage is formed. At this time, the pressure at the measurement pressure tapping point X2 comes from the pressure of the auxiliary measurement gas source.

[0087] by Figure 3 The illustrated embodiment also determines and determines the material level in the silo hopper by reading and judging the measured value of the material level detection measuring instrument △P.

[0088] Figure 4 The illustrated embodiment completes the tasks of multi-point material level measurement and discrimination such as high material level, medium material level, and low material level during the material change process in the silo hopper under the condition of introducing an auxiliary measurement gas source. Since an auxiliary measurement gas source is introduced in the measurement, the stability, accuracy, and continuity of the measurement and judgment are improved.

[0089] Figure 4 Each component in includes but is not limited to:

[0090] (1) Each component of the material storage and transfer equipment such as the silo hopper of the process production equipment: 1. Dust source point dust extraction point; 2. Dust-containing flue gas pipeline at the inlet of the dust collector; 3. Dust collector (bag type); 4. Dust collector ash hopper; 5. Clean flue gas pipeline at the outlet of the dust collector; 6. Dust removal system fan; 7. Clean flue gas discharge pipeline of the dust removal system;

[0091] (2) Each component of the material level detection and discrimination system / device: X1. Reference pressure tapping point; P1. Reference pressure tapping pipeline; X2 (H, M, L). Material level measurement pressure tapping point (high, medium, and low material levels); P2 (H, M, L). Material level measurement pressure tapping pipeline (high, medium, and low material levels); △P (H, M, L). Material level detection measuring instrument (pressure / differential pressure detection measuring instrument, sensor or transmitter, high, medium, and low material levels); CP. Material level indication and alarm device (or control system program control component device);

[0092] (3) Each component of the auxiliary measurement gas source: 1ATS. 1# auxiliary measurement gas source; 1AP. 1# auxiliary intake pipe; 1AV. 1# auxiliary intake valve; 2ATS. 2# auxiliary measurement gas source; 2AP. 2# auxiliary intake pipe; 2AV. 2# auxiliary intake valve; 3AP. Auxiliary measurement pipe; AV1. Reference auxiliary intake valve; AV2 (H, M, L). Measurement auxiliary intake valve (when measuring multi-point material levels, such as high, medium, and low material levels).

[0093] . Figure 4The embodiment shown is to realize the measurement of multi-point material level of high, medium and low. An auxiliary measurement gas source is introduced in the measurement. The purpose of introducing the auxiliary measurement gas source is also to ensure the stability, accuracy and continuity of the measurement judgment.

[0094] Figure 4 In addition to the components of the auxiliary measurement gas source for realizing the measurement of high, medium and low multi-point material levels, other components and attached drawings Figure 3 , Figure 2 and Figure 1 The components are the same as in the accompanying drawings, and Figure 4 The CP material level indication alarm device or the control system program control component device adopts a multi-signal channel configuration.

[0095] Figure 4 The added AV2H measurement auxiliary air intake valve provides an auxiliary measurement gas source for the high material level measurement pressure point X2H, the AV2M measurement auxiliary air intake valve provides an auxiliary measurement gas source for the medium material level measurement pressure point X2M, and the AV2L measurement auxiliary air intake valve provides an auxiliary measurement gas source for the low material level measurement pressure point X2L.

[0096] Figure 4 The control detection judgment logic and Figure 3 , Figure 2 and Figure 1 The principle is the same; the difference is that the auxiliary measurement gas source is introduced to ensure the stability of the reference pressure of the material level measurement pressure points X2H, X2M and X2L and the reference pressure point X1; Figure 4 The illustrated embodiment also judges and determines the material level in the silo hopper or material storage and transfer equipment 4 by reading and judging the measured value of the level detection measuring instrument ΔP.

[0097] Figure 5 The embodiment shown does not use a differential pressure detection measuring instrument, but instead uses a pressure detection measuring instrument to achieve multi-point level measurement of high, medium and low material levels in material storage and transfer equipment such as silos and hoppers; the reference pressure points and pipelines (X1 and P1) are cancelled during the measurement, and only the level measurement pressure points and pipelines (X2** and P2**) are set, and an auxiliary measurement gas source is also introduced.

[0098] Figure 5 The components include but are not limited to:

[0099] (1) Components of material storage and transfer equipment such as silos and hoppers of process production equipment: 1. Dust removal and exhaust points at dust source points; 2. Dust-containing flue gas duct at the dust collector inlet; 3. Dust collector (bag type); 4. Dust collector ash hopper; 5. Dust collector outlet clean flue gas duct; 6. Dust removal system fan; 7. Dust removal system clean flue gas discharge duct;

[0100] (2) Components of the material level detection and discrimination system / device: X2 (H, M, L). Material level measurement pressure tapping points (high, medium, and low material levels); P2 (H, M, L). Material level measurement pressure tapping pipelines (high, medium, and low material levels); ΔP (H, M, L). Material level detection and measurement instruments (pressure / differential pressure detection and measurement instruments, sensors or transmitters, high, medium, and low material levels); CP. Material level indication and alarm device (or control system program control component device);

[0101] (3) Components of the auxiliary measurement air source: 1ATS. 1# auxiliary measurement air source; 1AP. 1# auxiliary intake pipe; 1AV. 1# auxiliary intake valve; 2ATS. 2# auxiliary measurement air source; 2AP. 2# auxiliary intake pipe; 2AV. 2# auxiliary intake valve; 3AP. Auxiliary measurement pipe; AV1. Reference auxiliary intake valve; AV2 (H, M, L). Measurement auxiliary intake valve (when measuring multi-point material levels, such as high, medium, and low material levels).

[0102] Figure 5 The shown embodiment uses a pressure detection and measurement instrument to achieve high, medium, and low multi-point material level measurement. An auxiliary measurement air source is introduced in the measurement, the reference pressure tapping point X1 and the pipeline P1 are cancelled, and only the material level measurement pressure tapping points X2* (X2H, X2M, and X2L) are set.

[0103] Figure 5 It is configured according to the material level measurement pressure tapping points X2H, X2M, and X2L of high, medium, and low material levels. The material level detection and measurement instrument ΔP uses a pressure detection and measurement instrument, including a sensor or a transmitter; the CP material level indication and alarm device or the control system program control component device uses a multi-signal channel configuration; in order to ensure the stability, accuracy, and continuity of measurement and judgment, an auxiliary measurement air source is introduced in the measurement.

[0104] Figure 5 The control detection and judgment logic of the shown embodiment is the same as that of the above-mentioned embodiments in principle. Since the reference pressure tapping point X1 and the pipeline P1 are cancelled and only the material level measurement pressure tapping points X2H, X2M, and X2L are set, and the material level detection and measurement instrument ΔP uses a pressure detection and measurement instrument, when the material level in the silo, hopper, or material storage and transfer equipment changes, the change in the measurement value of the material level detection and measurement instrument ΔP and the control detection and judgment logic for the material level are as follows.

[0105] When there is no material level in the silo or hopper or the material level is respectively lower than the set low material level measurement pressure tapping point X2L, medium material level measurement pressure tapping point X2M, and high material level measurement pressure tapping point X2H, there is no material blockage in the air path formed between the material level measurement pressure tapping point X2* and the silo or hopper, the air path is unobstructed, and the measurement value of the material level detection and measurement instrument ΔP of the pressure detection and measurement instrument is the pressure inside the silo or hopper itself.

[0106] When there is a material level in the silo hopper, as the material level gradually rises, the low material level measurement pressure tapping point X2L is blocked by the material. Due to the blockage of the material, an air path blockage is formed at the low material level measurement pressure tapping point X2L. At this time, the measured value of the material level detection measuring instrument △PL of the pressure detection measuring instrument for the material level measurement pressure tapping point X2L is the pressure value of the auxiliary measurement air source; as the material level gradually rises, the middle material level measurement pressure tapping point X2M is blocked by the material. Due to the blockage of the material, an air path blockage is formed at the middle material level measurement pressure tapping point X2M. At this time, the measured value of the material level detection measuring instrument △PM of the pressure detection measuring instrument for the material level measurement pressure tapping point X2M is the pressure value of the auxiliary measurement air source; similarly, as the material level continues to rise, the high material level measurement pressure tapping point X2H is blocked by the material. Due to the blockage of the material, an air path blockage is formed at the high material level measurement pressure tapping point X2H. At this time, the measured value of the material level detection measuring instrument △PH of the pressure detection measuring instrument for the material level measurement pressure tapping point X2H is the pressure value of the auxiliary measurement air source; the CP material level indication alarm device or the control system program control component device determines the high, middle, and low material levels of the material in the silo hopper according to the pressure values measured by △PL, △PM, and △PH of the pressure detection measuring instrument.

[0107] Figure 5 In the shown embodiment, the pressure inside the production process equipment such as the silo hopper can also be introduced as the pressure of the reference pressure tapping point X1. The CP material level indication alarm device or the control system program control component device performs a subtraction operation on the introduced pressure inside the silo hopper and the pressure value of the material level measurement pressure tapping point X2** to obtain the pressure difference between the reference pressure tapping point X1 and the material level measurement pressure tapping point X2. At this time, the control detection judgment logic and principle are exactly the same as those of the above embodiments.

[0108] It should be noted that the above embodiments are only partial illustrative application examples of the present invention, not the engineering implementation construction design documents of engineering cases, and are only used for the description and expression of the technical ideas and technical solutions of the content of the present invention.

Claims

1. A hopper level detection and discrimination device, characterized by reference A pressure point (X1), a reference pressure pipeline (P1), a material level measurement pressure point (X2), a material level measurement pressure pipeline (P2), a material level detection measuring instrument (△P), a material level indication alarm device or a control system program control component device (CP), wherein the reference pressure point (X1) is set in an area that cannot be reached by a material level change that is designed and determined in the hopper; the material level measurement pressure point (X2) is set in a designated area within a material level change interval that is designed and determined in the hopper; the material level detection measuring instrument (△P) is connected to the reference pressure point (X1) through the reference pressure pipeline (P1); the material level detection measuring instrument (△P) is connected to the material level measurement pressure point (X2) through the material level measurement pressure pipeline (P2); the material level detection measuring instrument (△P) is connected to the material level indication alarm device or the control system program control component device (CP).

2. A hopper level detection and discrimination device according to claim 1, characterized in that The material level detection measuring instrument (ΔP) is a pressure / pressure difference detection measuring instrument, a sensor or a transmitter.

3. A hopper level detection and discrimination device according to claim 1, characterized in that The reference pressure pipeline (P1) and the material level measurement pressure pipeline (P2) are respectively connected to auxiliary gas source components.

4. A hopper level detection and discrimination device according to claim 3, characterized in that The auxiliary air source components include an auxiliary air intake pipe, an auxiliary air intake valve, a reference auxiliary air intake valve, and a measurement auxiliary air intake valve.

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