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CN-116337546-B - Multi-point sampling mechanism for high-temperature sampling system

CN116337546BCN 116337546 BCN116337546 BCN 116337546BCN-116337546-B

Abstract

The invention relates to the technical field of gas sampling, in particular to a multipoint sampling mechanism for a high-temperature sampling system, which comprises a sampler, a cooling blowback control box and a PLC control system; the invention realizes the multipoint sampling effect through the plurality of groups of probes, and the later-stage filter has the function of electric heating, thereby avoiding the gas from condensing after the gas is filtered and being mixed with dust to be adsorbed on the filter element, influencing the normal use of the later-stage filter, in addition, the flow transducer in the cooling water flow path is used for monitoring the flow of the cooling water at the inlet and the outlet of the sampler, when the data change of the two flow transmitters exceeds a certain difference value, the electric ball valve of the cooling water inlet and outlet is immediately closed, the electric ball valve sends a closing signal to the control system, the control system closes the whole set of sampling system and sends an alarm signal, and on-site maintenance personnel check faults to the site, so that the effect of preventing the cooling water from leaking in the sampler and flowing into the furnace top is realized, and the safety is improved.

Inventors

  • SHUANG XIA
  • LI NAN
  • TANG RONGQIANG
  • ZHANG JINLU

Assignees

  • 南京世舟分析仪器有限公司

Dates

Publication Date
20260512
Application Date
20230330

Claims (7)

  1. 1. Multipoint sampling mechanism for high temperature sampling system, which is characterized by comprising a sampler, a cooling blowback control box and a PLC control system, wherein: The two samplers are arranged in total, each of the two samplers comprises a probe (110) and a heat exchanger (120), the probes (110) are arranged at the front end of the heat exchanger (120), the rear end of the heat exchanger (120) is connected with a rear-stage filter (130) through a pipeline, and the heat exchanger (120) and the rear-stage filter (130) are provided with a first temperature sensor (140); The cooling blowback control box is internally provided with a nitrogen blowback system and a water cooling system, wherein: The nitrogen back flushing system comprises an air storage tank (211), a pressure sensor (212) and a second temperature sensor (213) are arranged at the top of the air storage tank (211), four groups of pipelines are connected to the bottom of the air storage tank (211), a pneumatic valve (214) and a first ball valve (215) are sequentially arranged on each group of pipelines, each two groups of pipelines are respectively connected with the rear end of a heat exchanger (120) and the sample outlet end of a rear-stage filter (130), and the inlet end of the air storage tank (211) is sequentially connected with a first filtering pressure-reducing valve (216) and a second ball valve (217) through pipelines; The water cooling system comprises a container type electromagnetic valve group (221), two groups of cooling water inlet components and cooling water outlet components, wherein the air inlet end of the container type electromagnetic valve group (221) is sequentially connected with a third ball valve (222), a second filtering pressure reducing valve (224) and a fourth ball valve (225) through pipelines, each group of cooling water inlet components comprises a solenoid valve (226) and a first ball valve (227) which are connected in parallel, the outlet ends of the solenoid valve (226) and the first ball valve (227) are sequentially connected with a first flow transmitter (228) and a first electric ball valve (229) through pipelines, each group of cooling water inlet components are all connected with a cooling water inlet of a heat exchanger (120), the inlet ends of the solenoid valve (226) and the first ball valve (227) are connected with a fifth ball valve (230) through pipelines, the cooling water outlet components comprise a sixth ball valve (231), a second flow transmitter (232) and a second electric ball valve (233) which are sequentially connected with each other through pipelines, and the outlet end of the cooling water outlet components of the sixth ball valve (231) is connected with the cooling water outlet end of the heat exchanger (120) through pipelines.
  2. 2. The multipoint sampling mechanism for a high temperature sampling system according to claim 1, wherein the air inlet end of the third ball valve (222) is connected with a second needle valve (223) through a pipe.
  3. 3. The multipoint sampling mechanism for a high temperature sampling system according to claim 1, wherein the PLC control system is installed in a cooling blowback control box.
  4. 4. The multipoint sampling mechanism for a high temperature sampling system according to claim 1, wherein the first temperature sensor (140) is connected to a PLC control system by a wire.
  5. 5. The multipoint sampling mechanism for a high temperature sampling system according to claim 1, wherein the pressure sensor (212) and the second temperature sensor (213) are connected to a PLC control system by wires.
  6. 6. The multipoint sampling mechanism for a high temperature sampling system according to claim 1, wherein the solenoid valve (226), the first flow transmitter (228) and the first electrically operated ball valve (229) are all connected to a PLC control system by wires.
  7. 7. The multipoint sampling mechanism for a high temperature sampling system according to claim 1, wherein the second flow transmitter (232) and the second electrically operated ball valve (233) are connected to a PLC control system by wires.

Description

Multi-point sampling mechanism for high-temperature sampling system Technical Field The invention relates to the technical field of gas sampling, in particular to a multipoint sampling mechanism for a high-temperature sampling system. Background The sampling analysis technology of the furnace gas of the steelmaking converter is to continuously detect the furnace gas component at the furnace top, calculate the relevant parameters in the blowing process such as decarburization rate, oxygen content in the furnace gas and the like, thereby determining the carbon content of molten steel, the component content, the temperature of a molten pool and the components of slag, and adjust the consumption of oxygen and a coolant to achieve the control of converter smelting, so that gas sampling is needed. The patent application number CN202020477369.2 discloses a converter top high-temperature gas sampling and temperature measuring device, which is recorded as comprising a sampling probe, a ball valve, a reducing nipple, a high-temperature alloy steel probe, a thermometer and a flange tube seat, wherein the converter top flange tube seat is connected with the reducing nipple, the ball valve and the sampling probe in sequence, the high-temperature alloy steel probe consists of a probe body and a flange plate, the flange plate is arranged at the top of the probe body, the flange plate is clamped between 2 flanges correspondingly connected with the reducing nipple and the flange tube seat, the bottom end of the probe body extends downwards into a gas phase space of the converter top, the upper end of the thermometer is fixedly connected with the flange plate, and the lower end of the thermometer extends downwards into the gas phase space of the converter top. The device has the functions of gas sampling and temperature measurement, is simple in structure, long in service life of a probe, easy to replace and maintain, capable of stably working for a long time on the premise of ensuring detection precision, and as in 201822233506.3, the device is recorded as comprising a sampling pipeline connected with an air flow conveying pipeline, a purging calibration pipeline and a venting pipeline, wherein a first ball valve, a check valve, a second pressure reducing valve, a second ball valve, a primary filter, a first rotor flowmeter, a high-efficiency filter and an oxygen analyzer are sequentially arranged on the sampling pipeline, an inlet of the purging calibration pipeline is respectively connected with a compressed air conveying pipe and a nitrogen conveying pipe through a three-position three-way valve, a third ball valve is arranged on the compressed air conveying pipe, a fourth ball valve is arranged on the nitrogen conveying pipe, a first-stage pressure reducing valve is arranged on the purging calibration pipeline, an outlet of the purging calibration pipeline is connected to the sampling pipeline between the check valve and the second ball valve, the venting pipeline is arranged on the sampling pipeline between the second-stage pressure reducing valve and the second ball valve, and the venting pipeline is arranged on the sampling pipeline of the second ball valve. The device is through reasonable structure setting, makes detection and production go on smooth ", and above-mentioned two patents are although can realize the purpose of high temperature gas sampling, but all lack the design to the multiple spot sample, simultaneously, because the inside super high temperature environment more than 1200 ℃ of furnace roof, the cooling water can decompose into oxygen and hydrogen under this environment, because the production of oxygen causes the explosion, and the security is not good, can't satisfy the user demand. In view of the foregoing, developing a multipoint sampling mechanism for a high temperature sampling system is still a critical problem in the gas sampling technical field. Disclosure of Invention The invention aims at solving the defects existing in the prior art, and provides a multipoint sampling mechanism for a high-temperature sampling system, which realizes the multipoint sampling effect through a plurality of groups of arranged probes, and the later-stage filter has a heating function, so that the phenomenon that gas is condensed after being filtered and mixed with dust to be adsorbed on a filter element, the normal use of the later-stage filter is influenced. In order to achieve the above purpose, the present invention provides the following technical solutions: The invention provides a multipoint sampling mechanism for a high-temperature sampling system, which comprises a sampler, a cooling blowback control box and a PLC control system, wherein: the two samplers are provided, each of the two samplers comprises a probe and a heat exchanger, the probes are arranged at the front end of the heat exchanger, the rear end of the heat exchanger is connected with a rear-stage filter through a pipeline, and the heat ex