Flue gas on-line analysis and sampling pretreatment system for fine ore suspension magnetization roasting furnace

Abstract

The utility model relates to the technical field of on-line analysis instrument measurement, in particular to a flue gas on-line analysis sampling pretreatment system for a fine ore suspension magnetization roasting furnace, and aims to solve the problem that when a conventional sampling probe is used for sampling and analyzing flue gas in a roasting reduction furnace at present, the sampling time is short. The problems that smoke sampling is interrupted and discontinuous due to the fact that a sampling probe is extremely prone to being blocked, continuous manual cleaning is needed, and finally the stability, coordination and reliability of a smoke component online analysis system are greatly influenced are solved. The system adopts a probe internal filter and an external filter to realize primary filtration of high-dust and high-temperature flue gas, electric heating of the external filter and electric heat tracing of a transmission pipeline, so that the temperature of the flue gas is kept above a dew point temperature, and condensed liquid is prevented from being mixed with coal gas smoke dust to block a filter element; the coil pipe condenser, the gas-water separator and the press type double-path sample gas refrigeration can realize efficient dehumidification of the sample gas, cold-dry method sample gas treatment, rapid bypass flow division and regular pollution discharge of the peristaltic pump, so that the operation reliability of the sampling pretreatment system is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of online analytical instrument measurement, in particular to an online analysis sampling pretreatment system for flue gas from a powder ore suspension magnetization roasting furnace. Background Art

[0002] Currently, suspended magnetized roasting and beneficiation technology for fine ore is of great significance for improving the quality and utilization rate of self-produced iron ore concentrate, further reducing production costs, improving mine resource flow, and increasing resource utilization. Suspended magnetized roasting is the process of heating the powder material to a certain temperature in a suspended state, and then reducing the hematite, siderite, and limonite in the material to magnetic iron minerals through the use of reducing gas. After roasting, the material can be magnetically separated to obtain high-quality iron ore concentrate. This technology has the advantages of high efficiency, large production capacity, good thermal energy utilization, high labor productivity, and environmental protection. Online analysis of the multi-component content of CO, CO2, and H2 in the flue gas of the fine ore suspension magnetized roasting reduction furnace is an important control indicator. It provides accurate information on the amount of material components for production process optimization and safety control, and is an important technical means. However, during the suspended magnetized roasting reaction of fine ore, the reduction furnace gas contains a large amount of dust, and the gas temperature is as high as over 400°C. The sampling probe is easily blocked by flue gas dust. If the fault is not handled in time, it will affect the normal production of the reactor. At present, the online analysis sampling and pretreatment system of the flue gas of the suspended magnetized roasting furnace of fine ore has a significant gap with the objective requirements of engineering applications in terms of reliability, stability and ease of maintenance. The sampling pretreatment system is often blocked, thereby blocking the continuous sampling of the flue gas, and is heavily dependent on manual cleaning, which has become an important factor restricting the stable, coordinated and reliable operation of the online analysis system of the flue gas composition of the suspended magnetized roasting furnace of fine ore. Utility Model Content

[0003] The utility model provides a powder ore suspension magnetization roasting furnace flue gas online analysis sampling pretreatment system to solve the problems existing in the above background.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A powder ore suspension magnetization roasting furnace flue gas online analysis sampling pretreatment system, including a probe built-in filter arranged on the inside of a gas pipeline, the probe built-in filter is connected to a probe external filter, the probe external filter is connected in parallel with multiple solenoid valves, each of the solenoid valves is connected to a PLC controller, the solenoid valves are also connected to an air-water separator on the inside of an analysis cabinet through an electric heating pipe, the air-water separator is connected in series with multiple compressor coolers, each of the compressor coolers is connected to an exhaust pump, the compressor cooler is also connected in parallel with an H2 analyzer and a CO and CO2 analyzer, and the air-water separator and the compressor cooler are also connected to a liquid storage tank arranged on the outside of the analysis cabinet.

[0006] Furthermore, a PTC ceramic self-limiting temperature electric heater is provided on the outer side of the external filter, a through-hole ball valve is provided between the PTC ceramic self-limiting temperature electric heater and the built-in filter of the probe, and a probe box is covered on the outer side of the PTC ceramic self-limiting temperature electric heater and the through-hole ball valve. One side of the probe box is connected to the built-in filter of the probe through a mounting flange, and an interface is provided on the other side of the probe box, and the multiple solenoid valves are all connected to the interface.

[0007] Furthermore, a sample gas pipe interface is provided on the outer wall of the analysis cabinet, and the solenoid valve is electrically connected to a cooling coil via the sample gas pipe interface, and the cooling coil is connected to the gas-water separator.

[0008] Furthermore, a shut-off valve is provided between the gas-water separator and the compressor cooler, a needle valve is connected in parallel to the vacuum pump, and the vacuum pump is also connected to a bypass pipe flowmeter, and the outlets of the bypass pipe flowmeter and the H2 analyzer, CO and CO2 analyzers are all connected to the exhaust pipe interface arranged on the outer wall of the analysis cabinet.

[0009] Furthermore, the compressor refrigerator is also connected in series with a filter and a membrane filter, the membrane filter is connected in parallel with a first sampling flowmeter and a second sampling flowmeter, and the first sampling flowmeter is connected to the CO and CO2 analyzers, and the second sampling flowmeter is connected to the H2 analyzer.

[0010] Furthermore, the compressor cooler and the gas-water separator are both connected to a peristaltic pump, the peristaltic pump is both connected to a drainage pipe interface provided on the outer wall of the analysis cabinet, and the liquid storage tank is also connected to the drainage pipe interface.

[0011] Furthermore, one side of the solenoid valve is also connected to a back-blowing air source.

[0012] The utility model has the following beneficial effects:

[0013] The utility model provides an online analysis and sampling pretreatment system for the flue gas of a powder ore suspension magnetized roasting furnace, which adopts an internal and external filter of the probe installed at the head of the probe tube in the flue to realize the primary filtration of high dust and high temperature flue gas; the electric heating of the external filter of the probe and the electric heating of the transmission pipeline keep the temperature of the sampled flue gas above its dew point temperature, preventing the condensate from mixing with the coal gas and smoke and clogging the filter element; the coil condenser, the gas-water separator and the compressor-type two-way sample gas refrigeration can reduce the humidity of the sample gas to 4°C, realizing efficient dehumidification; the cold-drying method of sample gas treatment, the rapid bypass diversion and the regular sewage discharge of the peristaltic pump effectively realize the operational reliability of the sampling and sample gas treatment system for process analysis, and solve the problem that when using conventional sampling probes for flue gas sampling and analysis in a roasting reduction furnace, the sampling probe is very easy to be blocked, which usually leads to interruption and discontinuity of flue gas sampling and requires manual continuous cleaning, which ultimately has a great impact on the stability, coordination and reliability of the online analysis system of the flue gas composition of the powder ore suspension magnetized roasting furnace.

[0014] The design of the internal and external back-flushing structure of the sampling probe external filter in the utility model solves the technical problems of filtering dust removal and non-clogging long-period continuous sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0016] The meanings of the reference numerals are as follows:

[0017] 1. Probe built-in filter; 2. Through-hole ball valve; 3. Probe external filter; 4. PTC ceramic self-limiting temperature electric heater; 5. Probe box; 6. Interface; 7. Electric heating pipe; 8. Cooling coil; 9. Gas-water separator; 10. Stop valve; 11. Compressor cooler; 12. Vacuum pump; 13. Needle valve; 14. Filter; 15. Membrane filter; 16. First sample inlet flowmeter; 17. Second sample inlet flowmeter; 18. CO and CO2 analyzers; 19. H2 analyzer; 20. Bypass pipe flowmeter; 21. Peristaltic pump; 22. Liquid storage tank; 23. PLC controller; 24. Solenoid valve; 25. Sample gas pipe interface; 26. Drain pipe interface; 27. Exhaust gas exhaust pipe interface; 28. Analytical cabinet; 29. Mounting flange; 30. Backflush gas source; 31. Gas pipeline. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1As shown, a flue gas online analysis sampling pretreatment system for a suspended magnetized roasting furnace of fine ore includes a probe built-in filter 1, a through-hole ball valve 2, a probe external filter 3, a PTC ceramic self-limiting temperature electric heater 4, a probe box 5, an electric heating pipe 7, a cooling coil 8, a gas-water separator 9, a compressor cooler 11, an air pump 12, a filter 14, a membrane filter 15, and a CO and CO2 analyzer 18. The H2 analyzer 19 also includes an analysis cabinet 28, which is provided with a sample gas pipe interface 25. The built-in filter 1 of the probe is connected to the inlet of the through-hole ball valve 2, and the outlet of the through-hole ball valve 2 is connected to the external filter 3 of the probe. The external filter 3 of the probe is surrounded by a PTC ceramic self-limiting temperature electric heater 4. The external filter 3 of the probe is installed in the probe box 5. The sample gas outlet of the external filter 3 of the probe is connected to the solenoid valve 24 through the probe box interface 6. The sample gas outlet of one solenoid valve 24 is connected to the electric heating pipe 7, and the electric heating pipe 7 is connected to the sample gas inlet of the cooling coil 8 through the sample gas pipe interface 25. The sample gas outlet of the cooling coil 8 is connected to the inlet of the gas-water separator 9. The sample gas outlet of the gas-water separator 9 is connected to the inlet of the stop valve 10. The sample gas outlet of the stop valve 10 is connected to the inlet of the first-stage cooling coil of the compressor cooler 11. The outlet of the first-stage cooling coil of the machine cooler 11 is respectively connected to the inlet of the vacuum pump 12 and the inlet of the needle valve 13; the outlet of the vacuum pump 12 is respectively connected to the inlet of the second-stage cooling coil of the compressor cooler 11, the outlet of the needle valve 13 and the inlet of the bypass pipe flowmeter 20; the sample gas outlet of the second-stage cooling coil of the compressor cooler 11 is connected to the inlet of the filter 14; the sample gas outlet of the filter 14 is connected to the inlet of the membrane filter 15; the sample gas outlet of the membrane filter 15 is respectively connected to the inlets of the first sample inlet flowmeter 16 and the second sample inlet flowmeter 17; the sample gas outlet of the first sample inlet flowmeter 16 is connected to the sample gas inlet of the CO and CO2 analyzer 18; the sample gas outlet of the second sample inlet flowmeter 17 is connected to the sample gas inlet of the H2 analyzer 19; the sample gas outlets of the CO and CO2 analyzers 18 and the H2 analyzer 19 are connected to the exhaust pipe interface 27.

[0020] The analyzer sampling probe box 5 includes a mounting flange 29 and a through-hole ball valve 2, a probe external filter 3, a PTC ceramic self-limiting temperature electric heater 4 and a temperature switch, and the main body is made of stainless steel.

[0021] The probe external filter 3 is an ultra-microporous SiC filter with a length of 135 mm, an outer diameter of 50 mm, and an inner diameter of 20 mm.

[0022] The rated voltage of the PTC ceramic self-limiting temperature electric heater 4 is 220V, AC / 50HZ, the rated power is 150W, and the automatic temperature limit is 200°C. In order to prevent the condensation of moisture in the high-temperature flue gas from clogging the filter element of the probe external filter 3, the probe external filter 3 is electrically heated for insulation.

[0023] The probe's built-in filter 1 is installed in the process pipeline at the probe head and is used for primary coarse filtration of the sample.

[0024] The compressor cooler 11 is a compressor-type dual-path sample gas condenser, and the condensate of the compressor cooler 11 is regularly discharged by a peristaltic pump 21 .

[0025] The condensate in the filter 14 is also regularly discharged by a peristaltic pump 21 .

[0026] The condensate outlet pipe of the peristaltic pump 21 is connected to the liquid storage tank 22 through the discharge pipe interface 26 .

[0027] The bypass pipe flowmeter 20 can effectively ensure the response speed of the online analysis system.

[0028] The back-blowing gas source 30 is connected to the solenoid valve 24 .

[0029] The analysis cabinet 28 is provided with three connection ports, a sample gas pipe interface 25 and an exhaust gas exhaust pipe interface 27 at the upper portion, and a liquid discharge pipe interface 26 at the lower left portion.

[0030] The small programmable PLC controller 23 effectively realizes automatic sampling control, automatic internal and external backflushing, automatic switching of gas lines and automatic discharge of condensate.

Claims

1. A system for online analysis and sampling of flue gas from a suspended magnetized roasting furnace for fine ore, characterized by: The invention comprises a probe internal filter (1) arranged on the inner side of a gas pipeline (31), the probe internal filter (1) is connected to a probe external filter (3), the probe external filter (3) is connected in parallel to a plurality of solenoid valves (24), each of the solenoid valves (24) is connected to a PLC controller (23), the solenoid valves (24) are further connected to a gas-water separator (9) on the inner side of an analysis cabinet (28) through an electric heating pipe (7), the gas-water separator (9) is connected in series to a plurality of compressor coolers (11), each of the compressor coolers (11) is connected to an air extraction pump (12), the compressor cooler (11) is further connected in parallel to an H2 analyzer (19) and a CO and CO2 analyzer (18), and the gas-water separator (9) and the compressor cooler (11) are further connected to a liquid storage tank (22) arranged on the outer side of the analysis cabinet (28).

2. The on-line analysis and sampling pretreatment system for flue gas from a suspended magnetized powder ore roasting furnace according to claim 1 is characterized by: The outer side of the external filter (3) is provided with a PTC ceramic self-limiting temperature electric heater (4), a through-hole ball valve (2) is provided between the PTC ceramic self-limiting temperature electric heater (4) and the probe built-in filter (1), and the outer sides of the PTC ceramic self-limiting temperature electric heater (4) and the through-hole ball valve (2) are covered with a probe box (5), one side of the probe box (5) is connected to the probe built-in filter (1) through a mounting flange (29), and the other side of the probe box (5) is provided with an interface (6), and the multiple solenoid valves (24) are all connected to the interface (6).

3. The on-line analysis and sampling pretreatment system for flue gas from a suspended magnetized powder ore roasting furnace according to claim 1 is characterized by: The outer wall of the analysis cabinet (28) is provided with a sample gas pipe interface (25), and the solenoid valve (24) is electrically connected to a cooling coil (8) via the sample gas pipe interface (25), and the cooling coil (8) is connected to the gas-water separator (9).

4. The on-line analysis and sampling pretreatment system for flue gas from a suspended magnetized powder ore roasting furnace according to claim 3 is characterized by: A stop valve (10) is provided between the gas-water separator (9) and the compressor cooler (11), and a needle valve (13) is connected in parallel to the air extraction pump (12). The air extraction pump (12) is also connected to a bypass pipe flowmeter (20), and the outlets of the bypass pipe flowmeter (20) and the H2 analyzer (19), CO and CO2 analyzers (18) are all connected to an exhaust gas exhaust pipe interface (27) provided on the outer wall of the analysis cabinet (28).

5. The on-line analysis and sampling pretreatment system for flue gas from a suspended magnetized powder ore roasting furnace according to claim 4 is characterized by: The compressor refrigerator (11) is further connected in series with a filter (14) and a membrane filter (15), and the membrane filter (15) is connected in parallel with a first sampling flow meter (16) and a second sampling flow meter (17), and the first sampling flow meter (16) is connected to the CO and CO2 analyzer (18), and the second sampling flow meter (17) is connected to the H2 analyzer (19).

6. The on-line analysis and sampling pretreatment system for flue gas from a suspended magnetized powder ore roasting furnace according to claim 5 is characterized by: The compressor cooler (11) and the gas-water separator (9) are both connected to a peristaltic pump (21), and the peristaltic pump (21) is connected to a liquid discharge pipe interface (26) provided on the outer wall of the analysis cabinet (28), and the liquid storage tank (22) is also connected to the liquid discharge pipe interface (26).

7. The on-line analysis and sampling pretreatment system for flue gas from a suspended magnetized powder ore roasting furnace according to claim 3 is characterized by: One side of the solenoid valve (24) is also connected to a back-blowing air source (30).

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