Temperature, pressure and flow integrated monitor

Abstract

The utility model provides a temperature, pressure and flow integrated monitor, which comprises a pitot tube, a differential pressure transmitter, a pressure transmitter, a temperature measuring element, a reverse blowing port, a PLC control end and a rack, and is characterized in that the rack comprises a front panel and a bottom plate, and the front panel is connected with the bottom plate in a solid welding manner; the differential pressure transmitter and the pressure transmitter are both arranged on a front panel, a flange fixing plate and a three-position five-way electromagnetic valve are further arranged on the front panel, and a pitot tube and a temperature measuring element are arranged on the flange fixing plate in a penetrating mode; the three-position five-way electromagnetic valve is respectively connected with the pitot tube and the differential pressure transmitter through pipelines, the differential pressure transmitter is connected with the pressure transmitter through a pipeline, and a filter is arranged on the pipeline between the three-position five-way electromagnetic valve and the differential pressure transmitter.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas monitoring, in particular to a temperature, pressure and flow integrated monitoring instrument. Background Art

[0002] The continuous flue gas emission monitoring system (CEMC) refers to a system that continuously monitors the concentration and total amount of gaseous pollutants and particulate matter emitted by atmospheric pollution sources and transmits the information to the competent authorities in real time. The temperature, pressure and flow monitor is the most important device in the continuous flue gas emission monitoring system, which is used to continuously monitor the flue gas temperature, pressure, flow rate and flow. The existing temperature, pressure and flow monitor body adopts a cabinet body design, which is large in size and requires a large installation space. The pitot tube is separated from the body, so it is necessary to install it on site and debug the monitor. The installation time is long and the manpower consumption is high. In addition, the existing backflush system is prone to differential pressure transmitters and pressure transmitters, and the entire monitor needs to be disassembled and repaired, which affects the working efficiency of the monitor. Therefore, a temperature, pressure and flow integrated monitor is needed. Utility Model Content

[0003] The utility model provides a temperature-pressure-flow integrated monitoring instrument, which can effectively solve the above problems.

[0004] The utility model is achieved in this way:

[0005] The utility model provides a temperature-pressure-flow integrated monitoring instrument, comprising: a pitot tube, a differential pressure transmitter, a pressure transmitter, a temperature measuring element, a back-blowing air port, a PLC control end and a frame, wherein the frame comprises a front panel and a bottom plate, and the front panel and the bottom plate are connected by fixed welding; the differential pressure transmitter and the pressure transmitter are both arranged on the front panel, and the front panel is also provided with a flange fixing plate and a three-position five-way solenoid valve, and the flange fixing plate is penetrated with the pitot tube and the temperature measuring element; the three-position five-way solenoid valve is respectively connected with the pitot tube and the differential pressure transmitter through pipelines, and the differential pressure transmitter is connected with the pressure transmitter through pipelines, and a filter is arranged on the pipeline between the three-position five-way solenoid valve and the differential pressure transmitter.

[0006] As a further improvement, a PLC control terminal and a plurality of back-blowing air ports are provided on the bottom plate.

[0007] As a further improvement, the three-position five-way solenoid valve is also connected to a back-blowing air port via a pipeline.

[0008] As a further improvement, the back-blowing air port is connected to a compressed air device via a pipeline.

[0009] As a further improvement, the PLC control terminal is provided with a liquid crystal display and an indicator light.

[0010] The beneficial effects of the utility model are:

[0011] The utility model adopts a new design idea, changes the traditional cabinet body design, has a compact structure, small size, is easy to install the instrument, and does not need to assemble and debug the monitor at the installation site, realizing the integrated research and development of temperature, pressure and flow measurement; by setting a three-position five-way solenoid valve, the monitor is easier to control, and has less working noise and vibration, and is more environmentally friendly; by setting a filter on the pipeline between the three-position five-way solenoid valve and the differential pressure transmitter, the collected flue gas is filtered without affecting the normal operation of the monitor, so as to prevent impurities in the flue gas from entering the differential pressure transmitter and the pressure transmitter, and the PLC control end regularly back-blows the Pitot tube to avoid blockage and damage of the Pitot tube; by setting an indicator light on the PLC control end, the operating status of each component inside the monitor can be intuitively fed back, thereby improving maintenance efficiency and avoiding troubleshooting of components one by one. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 The utility model is a schematic diagram of the Pitot tube connection structure of a temperature, pressure and flow integrated monitoring instrument.

[0014] Figure 2 The utility model is a schematic diagram of the main structure of a temperature-pressure-flow integrated monitor.

[0015] Figure 3 The utility model is a side view schematic diagram of a monitor structure of a temperature, pressure and flow integrated monitor.

[0016] Figure 4 The utility model is a schematic diagram of a monitor structure of a temperature, pressure and flow integrated monitor.

[0017] Figure 5 The utility model is a schematic diagram of the working principle of a three-position five-way solenoid valve of a temperature-pressure-flow integrated monitoring instrument.

[0018] In the figure: 1- Pitot tube, 11- low-pressure pipe, 12- high-pressure pipe, 2- flange fixing plate, 3- three-position five-way solenoid valve, 4- differential pressure transmitter, 5- pressure transmitter, 6- filter, 7- temperature measuring element, 8- back-blowing air port, 9- PLC control end, 10- rack, 101- front panel, 102- bottom plate, 11- compressed air device. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0020] Reference Figure 1-5 As shown, a temperature-pressure-flow integrated monitoring instrument includes: a pitot tube 1, a flange fixing plate 2, a three-position five-way solenoid valve 3, a differential pressure transmitter 4, a pressure transmitter 5, a filter 6, a temperature measuring element 7, a back-blowing air port 8, a PLC control terminal 9, a rack 10, and a compressed air device 11.

[0021] The frame 10 includes a front panel 101 and a bottom plate 102, which are connected to each other by welding; the front panel 101 is provided with a flange fixing plate 2, a three-position five-way solenoid valve 3, a differential pressure transmitter 4, a pressure transmitter 5 and a filter 6, which are connected to each other by welding, and have a large operating space, are convenient for debugging and installation, are easy to maintain, and have a compact structure. The flange fixing plate 2 is penetrated with a Pitot tube 1 and a temperature measuring element 7. The Pitot tube 1 includes a low-pressure tube 11 and a high-pressure tube 12. The three-position five-way solenoid valve 3 is respectively connected to the Pitot tube 1 and the differential pressure transmitter 4 through pipelines. The three-position five-way solenoid valve 3 is provided with a filter 6 on the pipeline between the differential pressure transmitter and the differential pressure transmitter. The differential pressure transmitter 4 is connected to the pressure transmitter 5 through the pipeline, so that impurities in the flue gas are filtered out by the filter element in the filter 6 to avoid impurities adhering to the differential pressure transmitter 4 and the pressure transmitter 5. The PLC control terminal 9 regularly performs backblowing operation on the Pitot tube 1 to improve the service life of the Pitot tube 1.

[0022] Furthermore, a PLC control terminal 9 and a plurality of back-blowing ports 8 are provided on the bottom plate 102. The three-position five-way solenoid valve 3 is also connected to one of the back-blowing ports 8 through a pipeline. The back-blowing port 8 is connected to a compressed air device 11 through a pipeline. Gas is introduced into the back-blowing port 8 through the compressed air device 11, and the gas flows into the low-pressure pipe 11 or the high-pressure pipe 12 by controlling the three-position five-way solenoid valve 3. A liquid crystal display and an indicator light are provided on the PLC control terminal 9. The liquid crystal display respectively displays the current temperature value, flow rate value and pressure value of the flue gas. The PLC control terminal 9 controls the three-position five-way solenoid valve 3 to realize the operation of smoke entry and back-blowing, and receives the signals of temperature, pressure difference and pressure, calculates the flow rate value after temperature and pressure compensation internally, and outputs it in the form of current. The PLC control terminal 9 also reads whether the three-position five-way solenoid valve 3, differential pressure transmitter 4, pressure transmitter 5 and temperature measuring element 7 are working normally, and displays it through the indicator light. When the color of the indicator light changes, the PLC control terminal 9 sends a signal to the CEMC for prompting, and the maintenance personnel understand the working status of the equipment according to the indicator light.

[0023] Further, refer to Figure 1 and Figure 5 As shown, in this embodiment, the three-position five-way solenoid valve 3 is provided with an A port and a B port for connecting to the pitot tube 1, and is used to connect to the S port and the R port of the differential pressure transmitter 4 and the P port connected to the back-blowing port 8; when working, the solenoid valves on both sides of the three-position five-way solenoid valve 3 are in a power-off state, that is, at this time, the A port of the three-position five-way solenoid valve 3 is connected to the R port, and the B port is connected to the S port; the high-pressure pipe 12 of the pitot tube 1 is connected to the A port of the three-position five-way solenoid valve 3 through a pipeline, the low-pressure pipe 11 of the pitot tube 1 is connected to the B port of the three-position five-way solenoid valve 3 through a pipeline, and the R port of the three-position five-way solenoid valve 3 is connected to the differential pressure transmitter through a pipeline through a filter 6 4, the S port of the three-position five-way solenoid valve 3 is connected to the low-pressure port of the differential pressure transmitter 4 through a pipeline through a filter 6, and a path is separated from the low-pressure port of the differential pressure transmitter 4 to connect to the pressure port of the pressure transmitter 5; the flue gas flows to the A port through the high-pressure pipe 12, and then flows out from the R port through the filter 6 to the high-pressure port of the differential pressure transmitter 4, the low-pressure gas flows to the B port through the low-pressure pipe 11, and then flows out from the S port through the filter 6 to the low-pressure port of the differential pressure transmitter 4, and then flows to the pressure port of the differential pressure transmitter 5 through the pipeline; the differential pressure transmitter 4 and the pressure transmitter 5 respectively measure the differential pressure value and the pressure value, and transmit the data to the PLC control end.

[0024] Furthermore, during back-blowing, when the high-pressure pipe 12 is back-blown, the solenoid valve on the side of the three-position five-way solenoid valve close to the A port is energized, and the solenoid valve on the side close to the B port is de-energized, that is, at this time, the P port of the three-position five-way solenoid valve 3 is connected to the A port, and the B port is connected to the S port; the compressed air device 11 introduces gas into the back-blowing port 8, flows out from the A port through the P port, enters the high-pressure pipe 12 to purge the inside of it, prevents the high-pressure pipe 12 from being blocked by particulate matter, and ensures that the gas inside the high-pressure pipe 12 The circulation is smooth. When the low-pressure pipe 11 is back-blown, the solenoid valve on the side of the three-position five-way solenoid valve close to the A port loses power, and the solenoid valve on the side close to the B port is energized, that is, at this time, the P port of the three-position five-way solenoid valve 3 is connected with the B port, and the A port is connected with the R port; the compressed air device 11 introduces gas into the back-blowing port 8, flows out from the B port through the P port, enters the low-pressure pipe 11, and performs a purge operation on the inside of the low-pressure pipe 11 to prevent the low-pressure pipe 11 from being blocked by particulate matter, thereby ensuring smooth gas circulation inside the low-pressure pipe 11.

[0025] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A temperature, pressure and flow integrated monitoring instrument, comprising: A pitot tube (1), a differential pressure transmitter (4), a pressure transmitter (5), a temperature measuring element (7), a back-blowing air port (8), a PLC control terminal (9) and a rack (10), characterized in that: The frame (10) comprises a front panel (101) and a bottom panel (102), and the front panel (101) and the bottom panel (102) are connected by welding; The differential pressure transmitter (4) and the pressure transmitter (5) are both arranged on the front panel (101); a flange fixing plate (2) and a three-position five-way solenoid valve (3) are also arranged on the front panel (101); a pitot tube (1) and a temperature measuring element (7) are passed through the flange fixing plate (2); The three-position five-way solenoid valve (3) is connected to the Pitot tube (1) and the differential pressure transmitter (4) respectively through pipelines, the differential pressure transmitter (4) is connected to the pressure transmitter (5) through pipelines, and a filter (6) is provided on the pipeline between the three-position five-way solenoid valve (3) and the differential pressure transmitter (4).

2. The temperature, pressure and flow integrated monitoring instrument according to claim 1, characterized in that: The bottom plate (102) is provided with a PLC control terminal (9) and a plurality of back-blowing air ports (8).

3. The temperature, pressure and flow integrated monitoring instrument according to claim 2, characterized in that: The three-position five-way solenoid valve (3) is also connected to a back-blowing air port (8) via a pipeline.

4. The temperature, pressure and flow integrated monitoring instrument according to claim 3, characterized in that: The back-blowing air port (8) is connected to a compressed air device (11) via a pipeline.

5. The temperature, pressure and flow integrated monitoring instrument according to claim 2, characterized in that: The PLC control terminal (9) is provided with a liquid crystal display screen and an indicator light.

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