Multi-mode switching control system of blast furnace gas analyzer

Abstract

The utility model discloses a multi-mode switching control system of a blast furnace gas analyzer, and belongs to the technical field of blast furnace gas sampling on-line analysis. Comprising a semi-clean gas pipeline, two sample gas pressure-taking heat tracing pipes, a chromatographic analyzer, two carrier gas bottle pipelines, a steam header pipe, a nitrogen bag, a waste gas storage tank and a waste water storage tank, the sample gas pressure-taking heat tracing pipe and the carrier gas bottle pipeline are both connected with the chromatographic analyzer; the steam header pipe is used for unblocking the sampling ends of the sample gas pressure-taking heat tracing pipes, the nitrogen bag is connected with the sampling ends of the two sample gas pressure-taking heat tracing pipes and used for purging and dehumidifying the sampling ends of the sample gas pressure-taking heat tracing pipes, and the nitrogen bag is connected with the sample gas pressure-taking heat tracing pipes and the chromatographic analyzer; the waste gas storage tank is connected with the two sample gas pressure-taking heat tracing pipes, and the waste water storage tank is connected with the two sample gas pressure-taking heat tracing pipes. The technical problems that a traditional blast furnace gas analyzer is long in sampling and pumping time, a sampling pipe is blocked, the back flushing effect is poor, gas leaks, and the automation degree of carrier gas conveying is low are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace safety production and gas sampling online analysis, in particular to a multi-mode switching control system for a blast furnace gas analyzer. Background Art

[0002] Blast furnace production conditions are complex. A series of chemical reactions and physical reductions of multiple elements within the furnace, carried out under high temperature and high pressure, produce uncontrollable components. This requires continuous analysis of the gas composition produced by the blast furnace to promptly adjust the raw material ratio. Currently, blast furnace gas analyzers are widely used in the iron and metallurgical industry. However, in production practice, the following deficiencies still exist:

[0003] 1. During the dual-probe switching backflushing process, nitrogen is retained in the sampling pipeline, and the sampling and drainage time is long, affecting the analysis data; 2. After the probe is switched, the sampling device cools down and condenses, and the condensed water drips into the sampling tube, mixes with the ash in the radius gas, and sticks to the tube wall, causing long-term blockage; 3. The backflushing system only has a timing function, and there is no pressure comparison for pressure differential backflushing. After backflushing, the dust on the surface of the filter element and the dust on the wall of the sampling tube cannot be effectively cleaned; 4. The exhaust gas emission and drainage measures do not take into account the danger to personnel safety caused by gas leakage; 5. The carrier gas delivery has long relied on inspection notification to replace the gas cylinder, which is prone to low carrier gas pressure and chromatograph shutdown, and the degree of automation is low.

[0004] Therefore, it is necessary to improve the existing blast furnace gas analyzer control system to solve the technical problems of traditional blast furnace gas analyzers, such as long sampling and extraction time, sampling tube blockage, poor backflushing effect, gas leakage and low degree of carrier gas transportation automation. Summary of the Invention

[0005] The purpose of this utility model is to provide a multi-mode switching control system for a blast furnace gas analyzer in response to the above problems, so as to solve the technical problems of traditional blast furnace gas analyzers such as long sampling and drainage time, sampling tube blockage, poor backflushing effect, gas leakage and low degree of carrier gas transportation automation.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the present utility model is:

[0007] A multi-mode switching control system for a blast furnace gas analyzer, characterized by comprising: a semi-clean gas pipeline, two sample gas pressure-taking and heating pipes, a chromatographic analyzer, two carrier gas bottle pipelines, a steam main pipe, a nitrogen bag, an exhaust gas storage tank, and a wastewater storage tank;

[0008] The two sample gas pressure tracing pipes can independently take samples from the semi-clean gas pipeline into the chromatograph, and the two carrier gas bottle pipelines can independently supply gas to the chromatograph; the steam main pipe is used to clear the blockage of the sampling end of the sample gas pressure tracing pipe, and the steam main pipe is provided with a steam pressure sensor and a steam temperature sensor; the nitrogen bag is connected to the two sample gas pressure tracing pipes and is used for purging and dehumidifying the sampling end of the sample gas pressure tracing pipe, and the nitrogen bag is connected to the two sample gas pressure tracing pipes and is used for the feedback of the sample gas pressure tracing pipe. Blow clean and exhaust gas is discharged. The nitrogen bag is connected to the chromatograph analyzer through a pressure reducing drying filter valve, and a nitrogen pressure sensor is provided on the nitrogen bag; the exhaust gas storage box is connected to the two sample gas pressure taking and heating pipes, and the exhaust gas of the sample gas pressure taking and heating pipes can be discharged into the exhaust gas storage box, and an exhaust gas pressure sensor is provided on the exhaust gas storage box; the wastewater storage tank is connected to the two sample gas pressure taking and heating pipes, and the wastewater of the sample gas pressure taking and heating pipes can be discharged into the wastewater storage tank, and a wastewater tank pressure sensor is provided on the wastewater storage tank.

[0009] Furthermore, the sampling end includes an upper chamber, a lower chamber and an electromagnetic shut-off valve, the upper chamber and the lower chamber are connected by the electromagnetic shut-off valve, the upper chamber is located above the lower chamber, a first-stage filter is provided in the upper chamber, an annular flow guide and expansion groove is provided on the upper part of the inner wall of the upper chamber, and the lower end of the lower chamber is connected to the semi-clean gas pipeline.

[0010] Furthermore, a steam branch is provided on the steam main pipe, and the lower chamber is connected to the steam branch through a steam purge valve; a pulse nitrogen branch is provided on the nitrogen bag, and the lower chamber is connected to the pulse nitrogen branch through a lower pressure pipe pulse purge valve, and the upper chamber is connected to the pulse nitrogen branch through an upper filter pulse purge valve.

[0011] Furthermore, the sample gas pressure taking and heating pipe is sequentially provided with a sample gas solenoid valve, an electromagnetic switching three-way valve, a dehydration detector, a secondary filter, an input solenoid valve, an electronic condenser, a filter pressure sensor, a nitrogen drying tube and a three-stage filter detector. The two sample gas pressure taking and heating pipes are converged in the middle and share the secondary filter, input solenoid valve, electronic condenser, filter pressure sensor, nitrogen drying tube and three-stage filter detector.

[0012] Furthermore, the two sample gas pressure-taking and heating pipes are connected to the solenoid valve located between the secondary filters through a pipeline, and two sample gas backwash valves are provided on the pipeline.

[0013] Furthermore, the nitrogen bag is provided with a nitrogen purge pipe and a nitrogen supply branch pipe, one end of the nitrogen purge pipe is connected to the electromagnetic switching three-way valve, and one end of the nitrogen purge pipe is led out and provided with a secondary purge solenoid valve, which is located on the sample gas pressure heating pipe and between the secondary filter and the input solenoid valve and is connected to the secondary purge solenoid valve; one end of the nitrogen supply branch pipe is connected to the nitrogen drying pipe through a nitrogen float flowmeter, and the nitrogen supply branch pipe is also provided with an end connected to the chromatograph analyzer through a pressure reducing drying filter valve.

[0014] Furthermore, a wastewater pipe is provided on the wastewater storage tank, and a plurality of branches are provided on the wastewater pipe. One branch is connected to the waste gas storage tank through an emptying solenoid valve, one branch is connected to the electronic condenser through a drainage solenoid valve and a water storage detector, and one branch is connected to the dehydration detector through a drainage solenoid valve.

[0015] Furthermore, the exhaust gas storage box is provided with an exhaust gas main pipe, and the exhaust gas main pipe is provided with multiple branches. One branch is connected to the sample gas solenoid valve and the sample gas pressure heating pipe between the electromagnetic switching three-way valve through an emptying solenoid valve, one branch is connected to the secondary filter through a sewage solenoid valve one and a bypass gas flow meter, one branch is connected to the water storage detector through a sewage solenoid valve three and the bypass gas flow meter, one branch is connected to the water storage detector through a sewage solenoid valve four and the bypass gas flow meter, and one branch is connected to the nitrogen drying pipe through the sewage solenoid valve.

[0016] Furthermore, the carrier gas bottle pipeline includes a carrier gas bottle, a carrier gas pressure sensor, a carrier gas branch pipe, an electromagnetic shut-off valve, a one-way valve, a dehumidifier and a pressure reducing filter valve; the two carrier gas bottle pipelines converge at the pressure reducing filter valve.

[0017] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0018] 1. The utility model improves the gas sampling end: the manual shut-off valve is changed into an electromagnetic shut-off valve, which has the function of remotely shutting off the gas sampling end, creating conditions for the next step of clearing the blockage; the upper filter-type gas source cleaning component and the internal structure of the upper chamber are improved, and the back-blowing type is changed into a pulse type, which enhances the air pressure compression cleaning effect, is conducive to cleaning the dust attached to the outside of the first-level filter, and effectively cleans the dust inside the upper chamber; the lower pressure pipe clearing elements are added: steam purge valve and lower pressure pipe pulse purge valve. When the electromagnetic shut-off valve is closed, limited cleaning of siltation can be carried out. After cleaning, nitrogen dehumidification can also be carried out to prevent the ash in the blast furnace gas from quickly solidifying.

[0019] 2. The utility model improves the sample gas collection component: when adding one more sample gas pressure-taking and heating pipe for switching, it ensures that the other sample gas pressure-taking and heating pipe is sampled and analyzed online; the backwash equipment of the sample gas pressure-taking and heating pipe: the electromagnetic switching three-way valve, the secondary purge solenoid valve, the secondary purge solenoid valve can be used for online cleaning to ensure that it does not affect the gas sampling and analysis data faults or false data, and can also ensure that the exhaust gas of the backwash pipeline is discharged, and the secondary filter device and the dehydration detector device are effectively cleaned of silt and moisture; additional external discharge equipment: exhaust gas external discharge equipment, silted water external discharge equipment, pure sample gas backwash valve, ensure that there is no exhaust gas and moisture in the sampling pipeline after backwashing, ensure that the exhaust gas and silted water are discharged in an organized manner, and ensure regional safety.

[0020] 3. The utility model improves the carrier gas switching device: the original mechanical type of the carrier gas bottle is changed into an intelligent pressure transmitter, the manual stop valve is changed into an electromagnetic stop valve, and a one-way valve is added to the pipeline: carrier gas pressure sensor, electromagnetic stop valve, one-way valve, carrier gas pressure sensor, to ensure that when the pressure of the carrier gas bottle is low, it can be switched quickly and prevent the high gas cylinder from flowing to the low gas cylinder, and can alarm and replace it in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is the system structure diagram of the utility model;

[0022] Figure 2 This is the structural diagram of the sampling end of the 1# sample gas pressure tracing pipe.

[0023] In the attached figure, 1-semi-clean gas pipeline, 2-semi-clean gas pressure sensor, 3-1# first-level gas pressure taking device, 4-1# electromagnetic shut-off valve, 5-1# first-level filter, 6-1# sample gas pressure tracing pipe, 7-1# sample gas electromagnetic valve, 8-1# electromagnetic switching three-way valve, 9-1# dehydration detector, 10-1# second-level filter, 11-1# input electromagnetic valve, 12-electronic condenser, 13-filter pressure sensor, 14-nitrogen drying tube, 15-three-stage filter detector, 16-chromatographic analyzer, 17-2# first-level gas pressure taking device, 18-2# electromagnetic shut-off valve, 19-2# first-level filter, 20-2# sample gas pressure tracing pipe, 21-2# sample gas electromagnetic valve, 22-2# electromagnetic switching three-way valve, 23- 2# dehydration detector, 24-2# secondary filter, 25-2# input solenoid valve, 26-1# steam branch pipe, 27-1# steam purge valve, 28-steam main pipe, 29-steam pressure sensor, 30-steam temperature sensor, 31-2# steam branch pipe, 32-2# steam purge valve, 33-1# pulse nitrogen branch pipe, 34-1# upper filter pulse purge valve, 35-nitrogen bag, 36-nitrogen pressure sensor, 37-1# lower pressure pipe pulse purge valve, 38-2# pulse nitrogen branch pipe, 39-2# upper filter pulse purge valve, 40-2# lower pressure pipe pulse purge valve, 41-nitrogen purge pipe, 42-1# secondary purge solenoid valve, 43-2# secondary purge solenoid valve, 44-nitrogen pressure sensor Supply branch pipe, 45-nitrogen float flowmeter, 46-pressure reduction drying filter valve, 47-exhaust main pipe, 48-1# emptying solenoid valve, 49-2# emptying solenoid valve, 50-1# bypass gas flowmeter, 51-2# bypass gas flowmeter, 52-3# bypass gas flowmeter, 53-exhaust storage tank, 54-exhaust pressure sensor, 55-exhaust gas external discharge safety pipe, 56-exhaust gas external discharge solenoid valve, 57-wastewater pipe, 58-1# drainage solenoid valve, 59-2# drainage solenoid valve, 60-3# drainage solenoid valve, 61-wastewater storage tank, 62-wastewater tank pressure sensor, 63-wastewater tank liquid level sensor, 64-drain pipe, 65-drain valve, 66-1# carrier gas bottle, 67-carrier gas pressure sensor, 68-1 #Carrier gas branch pipe, 69-Solenoid stop valve 1, 70-Check valve 1, 71-1# Dehumidifier, 72-2#Carrier gas bottle, 73-Carrier gas pressure sensor 2, 74-2#Carrier gas branch pipe, 75-Solenoid stop valve 2, 76-Check valve 2, 77-2#Dehumidifier, 78-Carrier gas main pipe, 79-Carrier gas pressure sensor 3, 80-Pressure reducing filter valve, 81-3#Sample gas pressure heating pipe, 82-3#Drain solenoid valve, 83-Water storage detector, 84-1#Sample gas pressure and temperature integrated sensor, 85-2#Sample gas pressure and temperature integrated sensor, 86-Drain solenoid valve 1, 87-Drain solenoid valve 2, 88-Drain solenoid valve 3, 89-Drain solenoid valve 4, 90-Sample gas backwash valve 1, 91-Sample gas backwash valve 2. DETAILED DESCRIPTION

[0024] The specific implementation of the utility model is further described below with reference to the accompanying drawings.

[0025] In the description of the present invention, it should be understood that the terms "center", "length", "width", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0027] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] See Figure 1 and Figure 2, a multi-mode switching control system for a blast furnace gas analyzer, characterized in that: it includes a semi-clean gas pipeline 1, two sample gas pressure tracing pipes, a chromatograph 16, two carrier gas bottle pipelines, a steam main pipe 28, a nitrogen bag 35, an exhaust gas storage box 53 and a wastewater storage box 61; a semi-clean gas pressure sensor 2 is provided on the semi-clean gas pipeline 1, the two sample gas pressure tracing pipes can independently take samples from the semi-clean gas pipeline 1 to the chromatograph 16, and the two carrier gas bottle pipelines can independently supply gas to the chromatograph 16; the steam main pipe 28 is used to clear the blockage of the sampling end of the sample gas pressure tracing pipe, and the steam main pipe 28 is provided with a steam pressure sensor 29 and a steam temperature sensor 30; the nitrogen bag 35 is connected to the sampling end of the two sample gas pressure tracing pipes and used for The sampling end of the sample gas pressure tracing pipe is purged and dehumidified, and the nitrogen bag 35 is connected to the two sample gas pressure tracing pipes and is used for backflushing and cleaning the sample gas pressure tracing pipes and exhausting the exhaust gas. The nitrogen bag 35 is connected to the chromatograph 16 through a pressure reducing drying filter valve 46, and a nitrogen pressure sensor 36 is provided on the nitrogen bag 35; the exhaust gas storage box 53 is connected to the two sample gas pressure tracing pipes, and the exhaust gas of the sample gas pressure tracing pipe can be discharged into the exhaust gas storage box 53, and the exhaust gas storage box 53 is provided with an exhaust gas pressure sensor 54; the waste water storage tank 61 is connected to the two sample gas pressure tracing pipes, and the waste water of the sample gas pressure tracing pipe can be discharged into the waste water storage tank 61, and the waste water storage tank 61 is provided with a waste water tank pressure sensor 62.

[0029] In this embodiment, the sampling end includes an upper chamber, a lower chamber, and an electromagnetic shut-off valve, the upper and lower chambers being connected via the electromagnetic shut-off valve. The upper chamber is located above the lower chamber and is provided with a primary filter. An annular flow guide and expansion groove is provided on the upper portion of the inner wall of the upper chamber. The lower end of the lower chamber is in communication with the semi-clean gas pipeline 1. A steam branch is provided on the steam main pipe 28, to which the lower chamber is connected via a steam purge valve. A pulse nitrogen branch is provided on the nitrogen bag 35, to which the lower chamber is connected via a lower pressure-taking pipe pulse purge valve. The upper chamber is connected via an upper filter pulse purge valve. Specifically, the sample gas pressure tracing pipe is divided into 1# sample gas pressure tracing pipe 6 and 2# sample gas pressure tracing pipe 20, 1# sample gas pressure tracing pipe 6 and 2# sample gas pressure tracing pipe 20 are merged into 3# sample gas pressure tracing pipe 81, the sampling end of 1# sample gas pressure tracing pipe 6 includes 1# first-level gas pressure device 3, 1# electromagnetic shut-off valve 4, 1# first-level gas pressure device 3 and 1# first-level filter 5, the steam main pipe 28 is connected to the 1# first-level gas pressure device 3 through 1# steam branch pipe 26 and 1# steam purge valve 27; the 1# pulse nitrogen branch pipe 33 on the steam main pipe 28 is connected to the upper chamber through 1# upper filter pulse purge valve 34, The 1# pulse nitrogen branch pipe 33 is also connected to the lower chamber via the 1# lower pressure pipe pulse purge valve 37; the 2# sample gas pressure tracing pipe 20 sampling end is connected to the 2# first-level gas pressure device 17, the 2# solenoid shut-off valve 18, the 2# first-level gas pressure device 17 and the 2# first-level filter 19, and the steam main pipe 28 is connected to the 2# first-level gas pressure device 17 via the 2# steam branch pipe 31 and the 2# steam purge valve 32; the 2# pulse nitrogen branch pipe 38 on the steam main pipe 28 is connected to the upper chamber via the 2# upper filter pulse purge valve 39, and the 2# pulse nitrogen branch pipe 38 is also connected to the lower chamber via the 2# lower pressure pipe pulse purge valve 40;

[0030] In this embodiment, the sample gas pressure taking and heating pipe is sequentially provided with a sample gas solenoid valve, an electromagnetic switching three-way valve, a dehydration detector, a secondary filter, an input solenoid valve, an electronic condenser 12, a filter pressure sensor 13, a nitrogen drying tube 14 and a three-stage filter detector 15. The two sample gas pressure taking and heating pipes converge in the middle and share the secondary filter, input solenoid valve, electronic condenser 12, filter pressure sensor 13, nitrogen drying tube 14 and three-stage filter detector 15. Specifically, the 1# sample gas pressure and temperature integrated sensor 84, the 1# sample gas solenoid valve 7, the 1# solenoid switching three-way valve 8, the 1# dehydration detector 9, the 1# secondary filter 10, and the 1# injection solenoid valve 11 are sequentially provided on the 1# sample gas pressure and temperature integrated sensor 85, the 2# sample gas solenoid valve 21, the 2# solenoid switching three-way valve 22, the 2# dehydration detector 23, the 2# secondary filter 24, and the 2# injection solenoid valve 25 are sequentially provided on the 2# sample gas pressure and temperature integrated sensor 85, the 2# sample gas solenoid valve 21, the 2# solenoid switching three-way valve 22, the 2# dehydration detector 23, the 2# secondary filter 24, and the 2# injection solenoid valve 25;

[0031] In this embodiment, the two sample gas pressure tracing pipes and the solenoid valves located between the secondary filters are connected by a pipeline, which is equipped with two sample gas backwash valves. Specifically, a pipeline is provided between the 1st secondary filter 10 and the 1st solenoid valve 11 and the 2nd secondary filter 24 and the 2nd solenoid valve 25, and the pipeline is equipped with sample gas backwash valve 1 90 and sample gas backwash valve 2 91.

[0032] In this embodiment, the nitrogen bag 35 is provided with a nitrogen purge pipe 41 and a nitrogen supply branch pipe 44. One end of the nitrogen purge pipe 41 is connected to the 1# electromagnetic switching three-way valve 8, and the other end is connected to the 2# electromagnetic switching three-way valve 22. One end of the nitrogen purge pipe 41 is also led out and provided with a 1# secondary purge solenoid valve 42 and a 2# secondary purge solenoid valve 43. The 1# secondary filter 10 and the 1# input solenoid valve 11 are connected to the 1# secondary purge solenoid valve 42, and the 2# secondary filter 24 and the 2# input solenoid valve 25 are connected to the 2# secondary purge solenoid valve 43; one end of the nitrogen supply branch pipe 44 is connected to the nitrogen drying pipe 14 through a nitrogen float flowmeter 45, and the nitrogen supply branch pipe 44 is also provided with an end connected to the chromatograph 16 through a reduced pressure drying filter valve 46.

[0033] In this embodiment, the wastewater storage tank 61 is provided with a wastewater pipe 57, which has multiple branches. One branch is connected to the waste gas storage tank 53 via the 3# drain solenoid valve 82; one branch is connected to the electronic condenser 12 via the 3# drain solenoid valve 60 and the water storage detector 83; one branch is connected to the 1# dehydration detector 9 via the 1# drain solenoid valve 58; and one branch is connected to the 2# dehydration detector 23 via the 2# drain solenoid valve 59. The wastewater storage tank 61 is also provided with a wastewater tank pressure sensor 62 and a wastewater tank liquid level sensor 63. Wastewater is discharged through a drain pipe 64 and a drain valve 65.

[0034] In this embodiment, the exhaust gas storage box 53 is provided with an exhaust gas main pipe 47, and the exhaust gas main pipe 47 is provided with multiple branches. One branch is connected between the 1# emptying solenoid valve 48 and the 1# sample gas solenoid valve 7 and the 1# electromagnetic switching three-way valve 8, one branch is connected between the 2# emptying solenoid valve 49 and the 2# sample gas solenoid valve 21 and the 2# electromagnetic switching three-way valve 22, one branch is connected to the 1# secondary filter 10 through the sewage solenoid valve 1 86 and the 1# bypass gas flow meter 50, one branch is connected to the 2# secondary filter 24 through the sewage solenoid valve 2 87 and the 2# bypass gas flow meter 51, one branch is connected to the water storage detector 83 through the sewage solenoid valve 3 88 and the 3# bypass gas flow meter 52, one branch is connected to the water storage detector 83 through the sewage solenoid valve 4 89 and the bypass gas flow meter, and one branch is connected to the nitrogen drying pipe 14 through the sewage solenoid valve. The exhaust gas storage box 53 is also provided with an exhaust gas pressure sensor 54 , and the exhaust gas is discharged through an exhaust gas discharge safety pipe 55 and an exhaust gas discharge solenoid valve 56 .

[0035] In this embodiment, one of the carrier gas bottle pipelines includes a 1# carrier gas bottle 66, a 1# carrier gas pressure sensor, a 1# carrier gas branch pipe 68, a 1# electromagnetic stop valve, a 1# check valve and a 1# dehumidifier 71 arranged on the carrier gas main pipe 78, and the other carrier gas bottle pipeline includes a 2# carrier gas bottle 72, a 2# carrier gas pressure sensor, a 2# carrier gas branch pipe 74, a 2# electromagnetic stop valve, a 2# check valve and a 2# dehumidifier 77; the two carrier gas bottle pipelines converge at a carrier gas pressure sensor 3 79 and a pressure reducing filter valve 80.

[0036] When using, you can have the following specific settings:

[0037] (1) Set the detection feedback signal of the semi-clean gas pressure sensor (2) to P1.

[0038] Set the following conditions for determining blockage and backflushing for sample gas pressure tracing pipes: P2 ≤ n51% P3 ≤ n52% P1 (n51 is a real number, n52 is a real number); P2 ≤ n61% P4 ≤ n62% P1 (n61 is a real number, n62 is a real number). For determining blockage for sample gas pressure tracing pipe 1# 6: P2 ≤ n11% P3 ≤ n12% P1 (n11 is a real number, n12 is a real number); for determining blockage for sample gas pressure tracing pipe 2# 20: P2 ≤ n21% P4 ≤ n22% P1 (n21 is a real number, n22 is a real number).

[0039] Backflush steps for the first-level gas pressure device (for example, before backflush of the first-level gas pressure device 3, the second-level gas pressure device 17 is switched to production mode): ① Close the first-level gas sample solenoid valve (7) and the first-level input solenoid valve (11), open the first-level filter pulse purge valve (34), and perform pulse purge on the first-level filter (5) and the inner wall of the first-level gas pressure device (3). ② After V1 seconds, close the first-level filter pulse purge valve (34) and the first-level solenoid shut-off valve (4), and open the first-level pressure pipe pulse purge valve (37). ③ After V2 seconds, close the first-level pressure pipe pulse purge valve (37), open the first-level steam purge valve (27), and perform wet high-temperature and high-pressure treatment on the lower pressure pipe. ④ After V3 seconds, close the 1# steam purge valve (27) and open the 1# lower pressure pipe pulse purge valve (37) to dry the pipe wall. ⑤ After V4 seconds, close the 1# lower pressure pipe pulse purge valve (37). ⑥ Before back-blowing the 2# gas pressure device, open the 1# electromagnetic shut-off valve (4).

[0040] (2) Set the filter pressure sensor (13) detection feedback signal to P2.

[0041] The pressure and temperature feedback signals detected by the 1# sample gas pressure and temperature integrated sensor (84) are set to P3 and T3 respectively. The pressure and temperature feedback signals detected by the 2# sample gas pressure and temperature integrated sensor (85) are set to P4 and T4 respectively. Under normal production conditions, P2=P3=P1 or P2=P4=P1 are set; the 1# sample gas pressure tracing heating pipe 6 is judged to be blocked: P2≤n1%P3 (n1 is a real number); the 2# sample gas pressure tracing heating pipe 20 is judged to be blocked: P2≤n2%P4 (n2 is a real number); the normal backflush conditions of the sample gas pressure pipe are set: P2≤n3%P3 and P2≤n4%p4 (n3 is a real number, n4 is a real number). The abnormal temperature alarm during online use is set, and the heating system is abnormal or blocked: T31≤m1%T3 and T41≤m2%T4.

[0042] (3) Backflush steps for the sample gas pressure pipe (for example, before backflush of the 1# sample gas pressure tracing pipe 6, the other sample gas pipe is switched to production mode): ① Close the 1# sample gas solenoid valve (7) and the 1# input solenoid valve (11), open the 1# secondary purge solenoid valve (42), the 1# drainage solenoid valve (58), and the second sewage solenoid valve (87), and discharge the moisture and ash in the 1# dehydration detector (9) and the 1# secondary filter (10). ② After K1 seconds, close the 1# drainage solenoid valve (58) and the second sewage solenoid valve (87), and open the 1# emptying solenoid valve (48). ③ After K2 seconds, close the 1# emptying solenoid valve (48) and the 1# secondary purge solenoid valve (42), switch the 1# electromagnetic switching three-way valve (8) to nitrogen channel delivery, and open the 1# drainage solenoid valve (58) and the second sewage solenoid valve (87). ④ After K3 seconds, close the 1# drainage solenoid valve (58) and the second sewage solenoid valve (87), and switch the 1# electromagnetic switching three-way valve (8) to the sample gas channel for delivery. ⑤ Enter the program flow, before using the 1# sample gas pipeline, open the sample gas backwash valve 1 (90), after K4 seconds, open the exhaust gas external exhaust solenoid valve (56), after K5 seconds, close the sample gas backwash valve 1 (90), activate the 1# sample gas pipeline, and after K6 seconds, close the exhaust gas external exhaust solenoid valve (56).

[0043] (4) The detection feedback signals of the 1# dehydration detector (9), the 2# dehydration detector (23), and the water storage detector (83) are set to L1, L2, and L3 respectively, the alarm values ​​of the 1# dehydration detector (9) and the 2# dehydration detector (23) are both L4, the alarm value of the water storage detector (83) is L5, and the interlocking values ​​of the three are all L6, where L6≤L4≤L5.

[0044] The built-in detection temperature feedback signal of the electronic condenser (12) is set to T5, and the refrigeration temperature is set to T5≥T6 for alarm. The detection feedback signal of the exhaust gas pressure sensor (54) is set to Q1, and the alarm interlock setting value is Q2, that is, the interlock is activated when Q1≥Q2. The detection feedback signal of the waste water tank pressure sensor (62) is set to Q3, and the alarm interlock setting value is Q4, that is, the interlock is activated when Q3≥Q4. The detection feedback signal of the waste water tank liquid level sensor (63) is set to L7, and the alarm interlock value is L8, that is, the interlock is activated when L7≥L8. The water storage detector (83) is set to detect the water volume feedback signal to L9, and the interlock is activated when L9≥L10. The detection pressure and temperature feedback signals of the 2# sample gas pressure and temperature integrated sensor (85) are set to P4 and T4 respectively.

[0045] (5) The waste gas storage box 53 collects residual waste gas during pipeline backwashing, nitrogen with ash during the backwashing process, coal gas under normal production conditions, and excess waste gas from the water collection tank. The following steps are as follows: ① Under normal production conditions, the sewage discharge solenoid valve 3 (88) and sewage discharge solenoid valve 4 (89) are normally open. ② When the sample gas pipeline and pressure taking device are in the backwashing state, the sewage discharge solenoid valve 1 (86) and sewage discharge solenoid valve 2 (87) are activated according to the backwashing state instruction or another production state instruction. ③ When the sample gas pipeline is in the backwashing state, the 1# emptying solenoid valve (48) and the 2# emptying solenoid valve (49) are activated according to the current backwashing state instruction. ④ When Q3 ≥ Q4, open the 3# emptying solenoid valve (82) to discharge the waste gas in the wastewater storage box (61). ⑤ When Q1 ≥ Q2, open the waste gas discharge solenoid valve (56) to discharge the waste gas storage box (53) to the organized emission system for use.

[0046] (6) The wastewater storage tank 61 collects the gray wastewater generated by the cooling of the 1# dehydration detector (9), 2# dehydration detector (23), and water storage detector (83) in the production state or backwash state, and discharges it externally. The following steps are as follows: ① Under normal production conditions, when the water level of the 1# dehydration detector (9), 2# dehydration detector (23), and water storage detector (83) reaches L6, the corresponding 1# drainage solenoid valve (58), 2# drainage solenoid valve (59), and 3# drainage solenoid valve (60) are interlocked and opened. ② Under backwash conditions, the corresponding sample gas pipeline backwash link opens the 1# drainage solenoid valve (58) or the 2# drainage solenoid valve (59). ③ When L4 or L5 alarms occur, it can be regarded as a corresponding valve failure or a detector failure. ④ When T5 ≥ T6, it is determined that the refrigeration effect is abnormal and needs to be checked.

[0047] (7) Set the pressure signal feedback from the carrier gas pressure sensor 1 (67) to A1, and A2 to the low pressure alarm value. Set the pressure signal feedback from the carrier gas pressure sensor 2 (73) to S1, and S2 to the low pressure alarm value. Set the pressure signal feedback from the carrier gas pressure sensor 3 (79) to Z1, and Z2 to the low pressure alarm interlock value. When A1≤A2, Z1≤Z2, open the electromagnetic stop valve 2 (75), and the carrier gas passes through the 2# dehumidifier (77). At this time, Z1≥Z2, the electromagnetic stop valve 1 (69) is interlocked and closed, and a reminder is given to replace the low pressure carrier gas cylinder. Otherwise.

[0048] The above description is a detailed description of the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the patent application of the present invention. All equivalent changes or modifications completed under the technical spirit suggested by the present invention should fall within the patent scope covered by the present invention.

Claims

1. A multi-mode switching control system for a blast furnace gas analyzer, characterized in that: Includes semi-clean gas pipeline, two sample gas pressure tracing pipes, chromatograph, two carrier gas bottle pipelines, steam main, nitrogen bag, waste gas storage tank and wastewater storage tank; The two sample gas pressure tracing pipes can independently take samples from the semi-clean gas pipeline into the chromatograph, and the two carrier gas bottle pipelines can independently supply gas to the chromatograph; the steam main pipe is used to clear the blockage of the sampling end of the sample gas pressure tracing pipe, and the steam main pipe is provided with a steam pressure sensor and a steam temperature sensor; the nitrogen bag is connected to the two sample gas pressure tracing pipes and is used for purging and dehumidifying the sampling end of the sample gas pressure tracing pipe, and the nitrogen bag is connected to the two sample gas pressure tracing pipes and is used for the feedback of the sample gas pressure tracing pipe. Blow clean and exhaust gas is discharged. The nitrogen bag is connected to the chromatograph analyzer through a pressure reducing drying filter valve, and a nitrogen pressure sensor is provided on the nitrogen bag; the exhaust gas storage box is connected to the two sample gas pressure taking and heating pipes, and the exhaust gas of the sample gas pressure taking and heating pipes can be discharged into the exhaust gas storage box, and an exhaust gas pressure sensor is provided on the exhaust gas storage box; the wastewater storage tank is connected to the two sample gas pressure taking and heating pipes, and the wastewater of the sample gas pressure taking and heating pipes can be discharged into the wastewater storage tank, and a wastewater tank pressure sensor is provided on the wastewater storage tank.

2. A blast furnace gas analyzer multi-mode switching control system according to claim 1, characterized in that: The sampling end includes an upper chamber, a lower chamber and an electromagnetic shut-off valve, the upper chamber and the lower chamber are connected by the electromagnetic shut-off valve, the upper chamber is located above the lower chamber, a first-level filter is provided in the upper chamber, an annular flow guide and expansion groove is provided on the upper part of the inner wall of the upper chamber, and the lower end of the lower chamber is connected to the semi-clean gas pipeline.

3. A multi-mode switching control system for a blast furnace gas analyzer according to claim 2, characterized in that: The steam main pipe is provided with a steam branch pipe, and the lower chamber is connected to the steam branch pipe through a steam purge valve; the nitrogen bag is provided with a pulse nitrogen branch pipe, and the lower chamber is connected to the pulse nitrogen branch pipe through a lower pressure pipe pulse purge valve, and the upper chamber is connected to the pulse nitrogen branch pipe through an upper filter pulse purge valve.

4. A blast furnace gas analyzer multi-mode switching control system according to claim 1, characterized in that: The sample gas pressure taking and heating pipe is sequentially provided with a sample gas solenoid valve, an electromagnetic switching three-way valve, a dehydration detector, a secondary filter, an input solenoid valve, an electronic condenser, a filter pressure sensor, a nitrogen drying tube and a three-stage filter detector. The two sample gas pressure taking and heating pipes converge in the middle and share the secondary filter, input solenoid valve, electronic condenser, filter pressure sensor, nitrogen drying tube and three-stage filter detector.

5. A blast furnace gas analyzer multi-mode switching control system according to claim 4, characterized in that: The two sample gas pressure-taking and heating pipes are located between the secondary filters and are connected through a pipeline with a solenoid valve. Two sample gas backwash valves are provided on the pipeline.

6. A blast furnace gas analyzer multi-mode switching control system according to claim 5, characterized in that: The nitrogen bag is provided with a nitrogen purge pipe and a nitrogen supply branch pipe. One end of the nitrogen purge pipe is connected to the electromagnetic switching three-way valve. One end of the nitrogen purge pipe is also led out and provided with a secondary purge solenoid valve. The sample gas pressure taking and heating pipe is located between the secondary filter and the input solenoid valve and is connected to the secondary purge solenoid valve; one end of the nitrogen supply branch pipe is connected to the nitrogen drying pipe through a nitrogen float flowmeter, and the nitrogen supply branch pipe is also provided with an end connected to the chromatograph analyzer through a reduced pressure drying filter valve.

7. A blast furnace gas analyzer multi-mode switching control system according to claim 6, characterized in that: The wastewater storage tank is provided with a wastewater pipe, and the wastewater pipe is provided with multiple branches. One branch is connected to the waste gas storage tank through an emptying solenoid valve, one branch is connected to the electronic condenser through a drainage solenoid valve and a water storage detector, and one branch is connected to the dehydration detector through a drainage solenoid valve.

8. A multi-mode switching control system for a blast furnace gas analyzer according to claim 7, characterized in that: The waste gas storage box is provided with a waste gas main pipe, and the waste gas main pipe is provided with multiple branches. One branch is connected to the sample gas solenoid valve and the sample gas pressure heating pipe between the electromagnetic switching three-way valve through an emptying solenoid valve, one branch is connected to the secondary filter through a sewage solenoid valve one and a bypass gas flow meter, one branch is connected to the water storage detector through a sewage solenoid valve three and the bypass gas flow meter, one branch is connected to the water storage detector through a sewage solenoid valve four and the bypass gas flow meter, and one branch is connected to the nitrogen drying pipe through the sewage solenoid valve.

9. A blast furnace gas analyzer multi-mode switching control system according to claim 1, characterized in that: The carrier gas bottle pipeline includes a carrier gas bottle, a carrier gas pressure sensor, a carrier gas branch pipe, an electromagnetic shut-off valve, a one-way valve, a dehumidifier and a pressure reducing filter valve; the two carrier gas bottle pipelines converge at the pressure reducing filter valve.

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