M701F4 improved flue gas on-line sampling device for gas-steam combined cycle unit

Abstract

The utility model discloses an M701F4 improved gas-steam combined cycle unit flue gas on-line sampling device which comprises a sampling pipeline led out from a flue gas sampling platform sampling port of a waste heat boiler rice platform, and an electromagnetic valve CV is arranged on a pipeline connected between the flue gas sampling platform sampling port and an external standard gas source. One end of the electromagnetic valve SV is connected with a flue gas heating pipeline, the other end of the electromagnetic valve SV is connected with a three-way valve ST, the three-way valve ST and an electromagnetic valve SV1 are additionally arranged, when flue gas full-stroke verification is carried out, the electromagnetic valves CV and SV1 are closed, standard gas directly enters the heating pipe through the three-way valve ST, the amount of the standard gas flowing into a chimney is reduced, the standard gas flow is improved, the response time is shortened, and the calibration efficiency is improved. During transformation, the peristaltic pump is moved to the bottom of the cabinet, after transformation, no water level or U-shaped pipe is raised in the middle of the drainage pipeline, condensed water can flow from a high position to a low position, the drainage pipeline is combed, drainage of a measurement loop of an analyzer is smooth through transformation, and the response time of SOs is greatly shortened.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of flue gas on -line sampling technology, more particularly to a kind of M701F4 improved type gas steam combined cycle unit flue gas on -line sampling device. BACKGROUND

[0002] At present, when M701F4 improved type gas steam combined cycle unit waste heat boiler outlet flue gas monitoring device carries out full stroke calibration, SO2 response cannot reach within 200 seconds specified in standard, which is due to water in flue gas in pipeline, and SO2 standard gas is absorbed by water in full stroke calibration process due to long-term water accumulation in cems device measuring pipeline, and part of calibration standard gas flows into chimney through sampling pipeline, various factors cause SO2 response time to far exceed standard specified range, so the problem of SO2 measurement response delay in M701F4 improved type gas steam combined cycle unit waste heat boiler flue gas on -line sampling device needs to be solved.

[0003] When M701F4 improved type gas steam combined cycle unit waste heat boiler outlet flue gas monitoring device carries out full stroke calibration, SO2 response cannot reach within 200 seconds specified in standard, which is due to water in flue gas in pipeline, and SO2 standard gas is absorbed by water in full stroke calibration process due to long-term water accumulation in cems device measuring pipeline, and part of calibration standard gas flows into chimney through sampling pipeline, various factors cause SO2 response time to far exceed standard specified range, so the problem of SO2 measurement response delay in M701F4 improved type gas steam combined cycle unit waste heat boiler flue gas on -line sampling device needs to be solved.

[0004] At present, aiming at the problem that SO2 response time of M701F4 improved type gas steam combined cycle unit waste heat boiler outlet flue gas monitoring device far exceeds standard specified range, all use dosing method in sampling device to transform to reduce SO2 response time, but it cannot be ensured that SO2 response time of each full stroke calibration meets standard requirement, and dosing method increases maintenance cost, aiming at the problem that SO2 response time of M701F4 improved type gas steam combined cycle unit waste heat boiler outlet flue gas monitoring device far exceeds standard specified range, all use dosing method in sampling device to transform, as dosing amount and consumption cannot be accurately matched, so it cannot be ensured that SO2 response time of each full stroke calibration meets standard requirement, and dosing method increases maintenance cost, and adding dosing equipment reduces reliability of measurement system. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of M701F4 improved type gas steam combined cycle unit flue gas on -line sampling device to solve the problems raised in the above background technique.

[0006] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme: a kind of MF improved gas steam combined cycle unit flue gas on-line sampling device, including the sampling pipeline that is led out from the flue gas sampling platform sampling port of waste heat boiler rice platform, and the pipeline between flue gas sampling platform sampling port and external standard gas source is equipped with electromagnetic valve CV, the flue gas heating pipeline that the electromagnetic valve SV one end is connected with standard gas flow heating is equipped, the other end of the electromagnetic valve SV is connected with three-way valve ST, one end of the three-way valve ST is connected on electromagnetic valve CV, the flue gas heating pipeline that the electromagnetic valve CV one end is connected on the chimney of external waste heat boiler, the other end of the electromagnetic valve SV is connected with electromagnetic valve SV1.

[0007] Preferably, the flue gas heating pipeline is provided with a resistance sensor PT100 for detecting the temperature of the pipeline, and the resistance sensor PT100 is connected with a heating controller HC1 and a heating controller HC2 through high-temperature-resistant wires. Through temperature detection and control, the flue gas can maintain an appropriate temperature in the heating pipeline, preventing the condensation of water in the flue gas and the change of certain components, thereby ensuring the accuracy and reliability of subsequent monitoring data.

[0008] Preferably, the monitoring drainage pipeline is also provided with a peristaltic pump, which is arranged at the bottom end of the inside of the external control cabinet to make the water in the monitoring drainage pipeline flow from high to low, effectively avoiding water accumulation in the drainage pipeline and preventing corrosion of the pipeline and equipment caused by water accumulation. At the same time, it can also avoid the absorption of components (such as sulfur dioxide) in the standard gas by the water, thereby reducing the interference with the monitoring results, especially the influence on the response time of sulfur dioxide.

[0009] Preferably, one port of the peristaltic pump is connected to one end of the electromagnetic valve SV through a switch-controlled valve, and the electromagnetic valve SV is connected to a terminal control device. Through the terminal control device, centralized control and management of the peristaltic pump and the electromagnetic valve SV can be realized, which facilitates flexible operation and monitoring by the operator according to the actual situation, and improves the automation degree and operation convenience of the system.

[0010] Preferably, the electromagnetic valve CV and the electromagnetic valve SV1 are in a closed state when the flue gas full-trip verification of the waste heat boiler is performed, and the standard gas directly enters the flue gas heating pipeline for heating through the three-way valve ST. During full-trip verification, the amount of standard gas flowing into the chimney can be reduced, the standard gas flow into the flue gas heating pipeline can be increased, thereby shortening the measurement response time and improving the verification efficiency and accuracy.

[0011] Compared with the prior art, the technical effects and advantages of the M701F4 improved gas-steam combined cycle unit flue gas online sampling device are that: the flue gas online monitoring system sampling is taken from the sampling port of the 60m platform flue gas sampling platform of the waste heat boiler, enters the flue gas heating pipeline through the electromagnetic valve SV, when the flue gas online monitoring system full stroke calibration is performed, the standard gas enters the sampling port through the flue gas heating pipeline, the electromagnetic valve CV and the electromagnetic valve SV, and due to the large capacity of the sampling port, most of the standard gas enters the chimney through the sampling port, the amount of the standard gas entering the flue gas heating pipeline through the electromagnetic valve SV is very small, and the measurement response time is long; now the three-way valve ST and the electromagnetic valve SV1 are added, when the flue gas full stroke calibration is performed, the electromagnetic valve CV and the electromagnetic valve SV1 are closed, the standard gas directly enters the flue gas heating pipeline through the three-way valve ST, the amount of the standard gas flowing into the chimney is reduced, the standard gas flow is improved, and the response time is reduced.

[0012] By optimizing the drainage pipeline of the monitoring device: the peristaltic pump of the monitoring device drainage pipeline is shifted, since the peristaltic pump is designed to be high, the output is small, the first and second stage drainage is not smooth, the pipeline and the flow meter of the analyzer are long-term waterlogged, SO2 in the standard gas in full stroke calibration is absorbed, and the SO2 response time is greatly affected. In the transformation, the peristaltic pump is shifted to the bottom of the cabinet, after the transformation, the drainage pipeline is no longer in the intermediate elevated water level and U-shaped pipe condition, the condensed water can flow from high to low, the monitoring drainage pipeline is combed, and the transformation makes the analyzer measurement loop drainage smooth, without waterlogging, and greatly shortens the SO2 response time. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a schematic diagram of the flue gas online sampling control structure of the utility model.

[0014] In the figure: 1, sampling pipeline; 2, electromagnetic valve SV; 3, flue gas heating pipeline; 4, three-way valve ST; 5, electromagnetic valve SV1; 6, electromagnetic valve CV; 7, monitoring drainage pipeline; 8, peristaltic pump. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0016] Please refer to Figure 1The utility model provides a technical scheme: a kind of M701F4 improved gas-steam combined cycle unit flue gas on-line sampling device, including the sampling pipeline 1 that is led out from waste heat boiler 60 meter platform flue gas sampling platform sampling port, sampling pipeline 1 is led out from waste heat boiler 60 meter platform flue gas sampling platform sampling port, its one end is directly and closely connected with sampling port, ensure that flue gas can smoothly enter pipeline. Another end is connected with electromagnetic valve SV2, and sampling pipeline 1 can stably transmit the flue gas generated by waste heat boiler to subsequent processing and monitoring link, provide reliable flue gas source for entire flue gas on-line sampling device, and electromagnetic valve CV6 is equipped on the pipeline connected between flue gas sampling platform sampling port and external standard gas source, electromagnetic valve CV6 is arranged on the pipeline between flue gas sampling platform sampling port and external standard gas source, its one end is connected with external standard gas source by pipeline, and pipeline can adopt corrosion -resistant material, such as stainless steel, to adapt to the chemical property that standard gas can have, guarantee the safety and stability of gas transmission. Another end is connected with one end of three-way valve ST4, and sealing washer can be arranged in connecting position, to enhance the sealing property of connecting place, prevent gas leakage. Simultaneously, electromagnetic valve CV6 is also connected with the chimney of external waste heat boiler, by controlling the opening and closing of electromagnetic valve CV6, the inlet path of standard gas can be accurately controlled, to avoid unnecessary waste and loss of standard gas. With the corrosion -resistant pipeline connection of external standard gas source, the purity and quality of standard gas are guaranteed, and are not affected by pipeline material.

[0017] The electromagnetic valve SV2 is connected with flue gas heating pipeline 3 for heating standard gas flow, and the flue gas heating pipeline 3 heats the flue gas, to ensure that the temperature of the flue gas is stable during transmission, prevent condensation of moisture and changes in some components, thereby ensuring the accuracy of subsequent monitoring data. Resistance sensor PT100 monitors the pipeline temperature in real time and accurately transmits the temperature signal to heating controllers HC1 and HC2, and the heating controllers accurately adjust the heating power according to the feedback signal, to form a closed-loop control system, so that the temperature of the flue gas is always maintained within a suitable range. This accurate temperature control not only improves the reliability of monitoring data, but also protects the pipeline and subsequent equipment from corrosion and damage caused by condensed water, to prolong the service life of the entire system.

[0018] The other end of the electromagnetic valve SV2 is connected with a three-way valve ST4, which plays an important role in gas flow splitting and switching during the full stroke verification process. By changing the valve state of the three-way valve, the flow direction of the standard gas can be flexibly controlled, allowing it to quickly switch between normal operation and verification mode. The reliable connection with each component ensures that the gas flows along the predetermined path, avoiding gas leakage and mixing. One end of the three-way valve ST4 is connected to an electromagnetic valve CV6, one end of which is connected to the chimney of the external waste heat boiler. The other end of the electromagnetic valve SV2 is connected to an electromagnetic valve SV1 5, which works in coordination with the electromagnetic valve CV6 during the full stroke verification of the flue gas. When both are closed, the standard gas can directly enter the flue gas heating pipeline 3 through the three-way valve ST4, reducing the amount of standard gas flowing into the chimney, increasing the standard gas flow, and thus shortening the measurement response time.

[0019] The flue gas heating pipeline 3 is provided with a resistance sensor PT100 for detecting the temperature of the pipeline. The resistance sensor PT100 is connected with heating controllers HC1 and HC2 through high-temperature resistant wires. The resistance sensor PT100 is installed on the pipeline and connected with the heating controllers HC1 and HC2 through high-temperature resistant wires. The high-temperature resistant wires should have good insulation and high-temperature resistance to ensure the stability and accuracy of signal transmission in high-temperature environments. The resistance sensor PT100 monitors the pipeline temperature in real time and accurately transmits the temperature signal to the heating controllers HC1 and HC2. The heating controllers accurately adjust the heating power according to the feedback signal, forming a closed-loop control system to keep the flue gas temperature within the appropriate range. This precise temperature control improves the reliability of the monitoring data.

[0020] The flue gas online sampling device also comprises a monitoring drainage pipeline 7, a peristaltic pump 8 is arranged on the monitoring drainage pipeline 7, the peristaltic pump 8 is arranged at the bottom end inside the external control cabinet to make the water in the monitoring drainage pipeline 7 flow from a high position to a low position, the monitoring drainage pipeline 7 collects condensate water from various positions (such as the position below the flue gas heating pipeline 3, the position near the analyzer and other equipment) where water accumulation is possible, the pipeline can be made of a corrosion-resistant material such as polytetrafluoroethylene to adapt to the corrosiveness of the condensate water. One end of the monitoring drainage pipeline 7 is connected to each water accumulation point, the connection mode can be hose connection to facilitate flexible arrangement and adjustment. The other end is connected to the inlet of the peristaltic pump 8, one port of the peristaltic pump 8 is connected to one end of the electromagnetic valve SV2 through a switch control valve, the switch control valve can be an electromagnetic valve or a manual valve, the connection mode is screw connection to ensure tight connection, the monitoring drainage pipeline 7 can timely and effectively collect and discharge the condensate water in the system to prevent water accumulation from causing corrosion and damage to the equipment and pipeline, and to avoid water absorption of components (such as sulfur dioxide) in the standard gas to reduce interference with the monitoring results, especially the influence on the response time of sulfur dioxide. The provision of the peristaltic pump 8 provides reliable drainage power, which can ensure smooth discharge of the condensate water even in the case of a certain height difference or resistance in the monitoring drainage pipeline 7. The peristaltic pump 8 is arranged at the bottom end inside the cabinet to make the water in the monitoring drainage pipeline 7 flow from a high position to a low position, fully utilizing the effect of gravity.

[0021] One port of the peristaltic pump 8 is connected to one end of the electromagnetic valve SV2 through a switch control valve, and a terminal control device is connected to the electromagnetic valve SV2. The electromagnetic valve CV6 and the electromagnetic valve SV1 5 are in a closed state when the flue gas full-trip verification is performed on the waste heat boiler, and the standard gas is directly introduced into the flue gas heating pipeline 3 through the three-way valve ST4 for heating. The control of the electromagnetic valve SV2 by the terminal control device realizes automatic operation and remote monitoring of the entire flue gas online sampling device. The operator can conveniently set the opening and closing state, working mode and other parameters of the electromagnetic valve SV2 through the terminal control device without manual operation on site, thereby improving work efficiency and convenience. In addition, the terminal control device can also be used to monitor the working state of the electromagnetic valve SV2 and the operating parameters of the system in real time, so as to discover and handle faults in time and ensure stable operation of the system.

[0022] Specifically, in use, the flue gas is introduced from the sampling port of the flue gas sampling platform of the 60-meter platform of the waste heat boiler, and is transmitted through the sampling pipeline 1. One end of the sampling pipeline 1 is tightly connected to the sampling port, and the other end is connected to the electromagnetic valve SV2, which stably transports the flue gas to the subsequent link to provide the source of flue gas for the entire device. The pipeline between the external standard gas source and the sampling port of the flue gas sampling platform is provided with an electromagnetic valve CV6, one end of which is connected to the standard gas source (using a corrosion-resistant stainless steel pipeline), and the other end is connected to the three-way valve ST4, and is also connected to the external waste heat boiler chimney. During the flue gas full-trip verification, the electromagnetic valve CV6 and the electromagnetic valve SV1 5 are closed, the standard gas directly enters the flue gas heating pipeline 3 through the three-way valve ST4, reduces the amount of standard gas flowing into the chimney, increases the standard gas flow into the heating pipeline, and shortens the measurement response time; during normal operation, the valve state of the electromagnetic valve CV6 and the like can be controlled to switch the gas flow, and after the flue gas enters the electromagnetic valve SV2, it flows to the flue gas heating pipeline 3. The resistance sensor PT100 on the pipeline monitors the temperature in real time, and transmits the signal to the heating controllers HC1 and HC2 through high-temperature-resistant wires, and the heating controllers accurately adjust the heating power according to the feedback to form a closed-loop control system, so as to ensure the stability of the flue gas temperature, prevent water condensation and component change, improve the reliability of the monitoring data, and protect the pipeline and equipment.

[0023] The monitoring drainage pipeline 7 collects condensed water from possible water accumulation sites (such as the lower part of the flue gas heating pipeline 3, the vicinity of the analyzer, etc.), and the pipeline is made of corrosion-resistant polytetrafluoroethylene material, one end of which is connected to the water accumulation point with a hose, and the other end is connected to the inlet of the peristaltic pump 8. The peristaltic pump 8 is arranged at the bottom end inside the external control cabinet, so that the water flows from high to low, and the gravity is used to assist drainage, one end of which is connected to one end of the electromagnetic valve SV2 through a switch control valve (an electromagnetic valve or a manual valve, screw connection), to provide reliable drainage power, timely drain the condensed water, prevent water corrosion of the equipment, absorption of the standard gas components, and interference with the monitoring results. The electromagnetic valve SV2 is controlled by the terminal control device through a control cable to realize automatic operation and remote monitoring of the device. The operator can conveniently set the opening and closing state, working mode and other parameters of the electromagnetic valve SV2 through the terminal device without manual operation on site, thereby improving the efficiency and convenience.

[0024] Finally, it should be noted that the above-described preferred embodiments of the present application are not intended to limit the present application, and although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to some of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A kind of M701F4 improved gas-steam combined cycle unit flue gas online sampling device, including the sampling pipeline (1) that is extracted from waste heat boiler 60 meter platform flue gas sampling platform sampling port, and electromagnetic valve CV (6) is equipped on the pipeline between flue gas sampling platform sampling port and external standard gas source, it is characterized in that: The electromagnetic valve SV (2) has one end connected with the flue gas heating pipeline (3) for heating the standard gas flow, the other end of the electromagnetic valve SV (2) is connected with the three-way valve ST (4), one end of the three-way valve ST (4) is connected with the electromagnetic valve CV (6), one end of the electromagnetic valve CV (6) is connected with the chimney of the external waste heat boiler, the other end of the electromagnetic valve SV (2) is connected with the electromagnetic valve SV1 (5).

2. The flue gas on-line sampling device of the improved M701F4 gas-steam combined cycle unit according to claim 1, characterized in that: The flue gas heating pipeline (3) is provided with the resistance sensor PT100 for detecting the pipeline temperature, the resistance sensor PT100 is connected with the heating controller HC1 and the heating controller HC2 through the high-temperature resistant wire.

3. The flue gas on-line sampling device of the improved M701F4 gas-steam combined cycle unit according to claim 1, characterized in that: The monitoring drainage pipeline (7) is further included, the peristaltic pump (8) is arranged on the monitoring drainage pipeline (7), the peristaltic pump (8) is arranged at the bottom end of the inside of the external control cabinet, so that the water in the monitoring drainage pipeline (7) flows from the high position to the low position.

4. The flue gas on-line sampling device of the improved M701F4 gas-steam combined cycle unit according to claim 3, characterized in that: One port of the peristaltic pump (8) is connected with one end of the electromagnetic valve SV (2) through the on-off valve controlled by the switch, and the electromagnetic valve SV (2) is connected with the terminal control device.

5. The flue gas on-line sampling device of the improved M701F4 gas-steam combined cycle unit according to claim 1, characterized in that: The electromagnetic valve CV (6) and the electromagnetic valve SV1 (5) are in the closed state when the waste heat boiler is in the full stroke verification of the flue gas, and the standard gas directly enters the flue gas heating pipeline (3) through the three-way valve ST (4) for heating.

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