Online detection device for material level of double-drum filter

Abstract

The utility model belongs to the technical field of liquid level detection, and particularly relates to a double-drum filter material level on-line detection device which comprises a double-drum filter, an air filtering pressure regulating valve, an in-situ pressure gauge, a glass tube rotor flow meter, a pressure transmitter and a gas pipeline, and the tail end of the gas pipeline extends into the double-drum filter and is located at the bottom of a filter drum. The front end of the gas pipeline is connected with a compressed air header pipe so that instrument air can be conveniently introduced into the gas pipeline, the air filtering pressure regulating valve, the in-situ pressure gauge, the glass tube rotor flow meter and the pressure transmitter are sequentially arranged on the gas pipeline, the pressure transmitter is connected with the DCS, and the DCS is connected with the compressed air header pipe. And the sensor is used for transmitting a detected signal to the DCS control system for display.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid level detection, and particularly relates to an on-line detection device for the material level of a double-drum filter. Background Technique

[0002] The nitric acid and phosphate fertilizer plant invested and built by our company is a large-scale modern production plant with an annual output of 900,000 tons of nitric acid and phosphate fertilizer, which is a key construction project. The double-drum filter is one of the key equipment in the nitric acid and phosphate fertilizer production process. In actual production, the crystal slurry is first added into the bottom of the filter drum of the double-drum filter. Under the negative pressure provided by the induced draft fan, liquid-solid separation is carried out through the filter drum of the double-drum filter. If the crystal slurry fails to separate liquid from solid, the material level at the bottom of the drum will continue to rise until it overflows into the waste water system. This not only causes the loss of effective components, but also reduces the amount of mother liquor produced, seriously affecting the production load. At present, there is no on-line detection of the material level at the bottom of the drum of the double-drum filter, and abnormal conditions cannot be detected and processed in time. At the same time, if a traditional liquid level sensor is used, the slurry is likely to crystallize on the surface of the sensor, resulting in the failure of the liquid level sensor. Content of the Utility Model

[0003] The utility model provides an on-line detection device for the material level of a double-drum filter aiming at the above problems.

[0004] To achieve the above purpose, the utility model adopts the following technical solutions:

[0005] An on-line detection device for the material level of a double-drum filter includes a double-drum filter, an air filtration and pressure regulating valve, a local pressure gauge, a glass tube rotameter, a pressure transmitter and a gas pipeline. The end of the gas pipeline extends into the double-drum filter and is located at the bottom of the filter drum. The front end of the gas pipeline is connected to the compressed air main pipe to facilitate the introduction of instrument air into the gas pipeline. The air filtration and pressure regulating valve, the local pressure gauge, the glass tube rotameter and the pressure transmitter are sequentially arranged on the gas pipeline. The pressure transmitter is connected to the DCS control system to transmit the detected signal to the DCS control system for display.

[0006] Further, a heat exchanger is also arranged between the compressed air main pipe and the gas pipeline to heat the instrument air entering the gas pipeline.

[0007] Furthermore, an alarm is also included. The alarm is connected to the output end of the DCS control system to give an alarm when the liquid level exceeds the set value.

[0008] Compared with the prior art, the utility model has the following advantages:

[0009] The utility model can realize on-line detection of the material level of the double-drum filter used in the production of nitric acid and phosphate fertilizer, which is convenient for operators to timely discover the abnormal state of equipment filtration;

[0010] The utility model preheats the instrument air through a heat exchanger, effectively avoiding the problem that the slurry temperature is too low and easily crystallizes and blocks the gas pipeline, and ensuring the reliability and accuracy of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the utility model;

[0012] In the figure, the double-drum filter 1, the air filtration and pressure regulating valve 2, the local pressure gauge 3, the glass tube rotameter 4, the pressure transmitter 5, the gas pipeline 6, the compressed air main pipe 7, the DCS control system 8, the heat exchanger 9, and the alarm 10. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] In order to further elaborate on the technical solution of the utility model, the utility model will be further described below through embodiments.

[0014] As Figure 1 shown, a device for on-line detection of the material level of a double-drum filter includes a double-drum filter 1, an air filtration and pressure regulating valve 2, a local pressure gauge 3, a glass tube rotameter 4, a pressure transmitter 5, and a gas pipeline 6. The end of the gas pipeline 6 extends into the double-drum filter 1 and is located at the bottom of the filter drum. The front end of the gas pipeline 6 is connected to the compressed air main pipe 7 to facilitate the introduction of instrument air into the gas pipeline 6. A heat exchanger 9 is also provided between the compressed air main pipe 7 and the gas pipeline 6 for heating the instrument air entering the gas pipeline 6. The air filtration and pressure regulating valve 2, the local pressure gauge 3, the glass tube rotameter 4, and the pressure transmitter 5 are sequentially arranged on the gas pipeline 6. The pressure transmitter 5 is connected to the DCS control system 8 for transmitting the detected signal to the DCS control system 8 for display. The alarm 10 is connected to the output end of the DCS control system 8 for alarming when the liquid level exceeds the set value.

[0015] Working process: The instrument air is first heated by heat exchange in the heat exchanger 9, then the pressure is stabilized by the air filtration and pressure regulating valve 2, and the pressure can be observed through the local pressure gauge 3. After the flow rate is adjusted by the glass tube rotameter 4, it enters the lower part of the filter drum of the double-drum filter 1. The pressure-stabilized instrument air bubbles evenly in the slurry to above the liquid level. The pressure transmitter 5 detects the pressure at the air outlet and converts it into a 4-20 mA signal, which is finally transmitted to the DCS control system 8 for display. When the liquid level exceeds the set value, an alarm is given through the alarm 10.

[0016] The main features and advantages of the present utility model have been shown and described above. For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and without departing from the spirit or basic characteristics of the present utility model, the present utility model can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model.

[0017] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An on-line level detection device for a double-drum filter, characterized in that: It includes a double-drum filter (1), an air filtration pressure regulating valve (2), a local pressure gauge (3), a glass tube rotameter (4), a pressure transmitter (5) and a gas pipeline (6). The end of the gas pipeline (6) extends into the double-drum filter (1) and is located at the bottom of the filter drum. The front end of the gas pipeline (6) is connected to the compressed air main pipe (7) to facilitate the introduction of instrument air into the gas pipeline (6). The air filtration pressure regulating valve (2), the local pressure gauge (3), the glass tube rotameter (4) and the pressure transmitter (5) are sequentially arranged on the gas pipeline (6). The pressure transmitter (5) is connected to the DCS control system (8) and is used to transmit the detected signal to the DCS control system (8) for display.

2. The on-line material level detection device for a double-drum filter according to claim 1, characterized in that: A heat exchanger (9) is further arranged between the compressed air main pipe (7) and the gas pipeline (6) and is used to heat the instrument air entering the gas pipeline (6).

3. An on-line level detection device for a double-drum filter according to claim 1, characterized in that: It further includes an alarm (10). The alarm (10) is connected to the output end of the DCS control system (8) and is used to give an alarm when the liquid level exceeds the set value.

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