CN211424464U - Zirconia oxygen measurement probe intelligence sweeps and prevents stifled system - Google Patents
Zirconia oxygen measurement probe intelligence sweeps and prevents stifled system Download PDFInfo
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- CN211424464U CN211424464U CN201921737295.5U CN201921737295U CN211424464U CN 211424464 U CN211424464 U CN 211424464U CN 201921737295 U CN201921737295 U CN 201921737295U CN 211424464 U CN211424464 U CN 211424464U
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Abstract
The utility model relates to a zirconia oxygen content measuring probe intelligence sweeps and prevents stifled system belongs to coal fired boiler automatic control field. The utility model discloses a nonrust steel pipe, control solenoid valve, DCS control system, signal transmitter, signal terminal box, zirconia measuring probe and ceramic filter, the head at zirconia measuring probe is installed to the ceramic filter, the afterbody at zirconia measuring probe is installed to the signal terminal box, the signal terminal box is connected with the signal transmitter, the signal transmitter is connected with DCS control system, DCS control system is connected with control solenoid valve, control solenoid valve and nonrust steel union coupling. The utility model has the advantages of simple and reasonable design effectively, have the characteristics that intelligence in time sweeps to improve coal fired boiler flue gas oxygen content measurement's accuracy.
Description
Technical Field
The utility model relates to a zirconia oxygen content measuring probe intelligence sweeps and prevents stifled system belongs to coal fired boiler automatic control field.
Background
When burning, coal reacts chemically with oxygen in the air to produce smoke and release a great deal of heat. By measuring the oxygen content in the flue gas generated by coal combustion, whether the coal is sufficiently combusted can be indirectly reflected. In an automatic control system of a coal-fired boiler, the optimal proportion of fire coal and air is regulated and combustion is optimized by monitoring the oxygen content in flue gas on line in real time, and the automatic control system has important significance in the aspects of energy conservation, emission reduction, safety, environmental protection and the like.
Research on the measurement principle of zirconia shows that, in an ideal state, when a zirconia element reaches a working temperature (generally 750 ℃) and the oxygen content inside and outside an electrode is unequal, an oxygen concentration difference battery is formed, battery electromotive force is formed, and the relationship between the battery electromotive force and the oxygen concentration on the surface of the electrode conforms to the Nernst equation.
By utilizing the principle, a zirconia ion exchange method is commonly adopted in an automatic control system of the coal-fired boiler to measure the oxygen content in the flue gas, for example, the zirconia oxygen analyzer is adopted as a key device in Chinese patent with the application number of CN85100958 of the Chinese atomic energy science research institute. The method is widely applied to boilers of thermal power plants, heating furnaces and oil pipelines of oil refineries, heating furnaces and soaking furnaces of smelting plants, and industrial boilers of enterprises of chemical engineering, light textile, food processing, pharmacy, cement, heating and the like.
The zirconium oxide oxygen analyzer mainly comprises a probe and a transmitter. The probe is an oxygen sensor with a zirconium oxide battery and mainly used for outputting a potential signal value corresponding to the measured oxygen amount. The transducer converts the potential signal value input from the probe into a corresponding oxygen value, and converts the oxygen value into a corresponding current value to be output.
In order to reduce the erosion and wear of the zirconia probe when the flue gas flows and filter the dust in the flue gas, a ceramic filter is usually installed at the head of the zirconia oxygen analyzer probe.
In the practical application process, because the flue gas of the pulverized coal fired boiler contains a large amount of dust, the ceramic filter at the head of the zirconia probe is often covered and blocked by the dust, and the longer the running time is, the more serious the blockage is, so that the flue gas can not penetrate through the ceramic filter to enter the zirconia reaction zone to be ionized to generate oxygen ions, and the concentration potential is generated. The oxygen quantity signal output by the zirconia transmitter is a straight line, and the value does not change for a long time.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the above-mentioned not enough that exists among the prior art, and provide a zirconia oxygen content measuring probe intelligence that structural design is reasonable sweeps and prevents stifled system to reach the purpose of guaranteeing zirconia probe device can normally measure the oxygen content in the flue gas.
The utility model provides a technical scheme that above-mentioned problem adopted is: this zirconia oxygen content measuring probe intelligence sweeps prevents stifled system, its structural feature lies in: including nonrust steel pipe, control solenoid valve, DCS control system, signal transmitter, signal terminal box, zirconia measuring probe and ceramic filter, the ceramic filter is installed at zirconia measuring probe's head, the afterbody at zirconia measuring probe is installed to the signal terminal box, the signal terminal box is connected with signal transmitter, signal transmitter and DCS control system are connected, DCS control system and control solenoid valve are connected, control solenoid valve and nonrust steel pipe are connected.
Further, the stainless steel pipe cleaning device further comprises a nozzle and a valve, wherein the nozzle and the valve are respectively arranged at two ends of the stainless steel pipe, and the valve is connected with the control electromagnetic valve.
Further, the nozzle is a tapered, open-hole nozzle.
Further, the diameter of the stainless steel pipe is 12 cm. The length of which reaches right up to the ceramic filter of the zirconia probe head.
Further, the diameter of the nozzle is 5 cm.
Further, the stainless steel tube is arranged in parallel with the zirconia measurement probe.
Compared with the prior art, the utility model has the advantages of it is following: the utility model has the advantages of simple and reasonable design effectively, have the characteristics that intelligence in time sweeps to improve coal fired boiler flue gas oxygen content measurement's accuracy.
Drawings
FIG. 1 is the utility model discloses zirconia oxygen content measuring probe intelligence sweeps prevents stifled system's schematic structure.
In the figure: stainless steel pipe 1, control solenoid valve 2, DCS control system 3, signal transmitter 4, signal terminal box 5, zirconia measuring probe 6, ceramic filter 7, nozzle 8, valve 9.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not intended to limit the present invention.
Examples are given.
Referring to fig. 1, it should be understood that the structures, ratios, sizes, etc. shown in the drawings attached to the present specification are only used for matching with the contents disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no essential technical significance, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes should still fall within the scope of the present invention. Meanwhile, in the present specification, if there are terms such as "upper", "lower", "left", "right", "middle" and "one", they are used for clarity of description only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are considered as the scope of the present invention without substantial changes in the technical content.
The zirconia oxygen volume measuring probe intelligence in this embodiment sweeps anti-blocking system, including nonrust steel pipe 1, control solenoid 2, DCS control system 3, signal transmitter 4, signal terminal box 5, zirconia measuring probe 6, ceramic filter 7, nozzle 8 and valve 9.
The ceramic filter 7 in the embodiment is arranged at the head of the zirconia measuring probe 6, the signal junction box 5 is arranged at the tail of the zirconia measuring probe 6, the signal junction box 5 is connected with the signal transmitter 4, the signal transmitter 4 is connected with the DCS control system 3, the DCS control system 3 is connected with the control electromagnetic valve 2, and the control electromagnetic valve 2 is connected with the stainless steel pipe 1; in general, a nozzle 8 and a valve 9 are respectively disposed at both ends of the stainless steel pipe 1, and the valve 9 is connected to the control solenoid valve 2.
The nozzle 8 in this embodiment is a tapered open-hole nozzle, the diameter of the stainless steel tube 1 is 12cm, the length of the stainless steel tube just reaches the ceramic filter of the zirconia probe head, the diameter of the nozzle 8 is 5cm, and the stainless steel tube 1 and the zirconia measurement probe 6 are arranged in parallel.
The oxygen content signal transmitter 4 sends the measured oxygen content signal to a remote DCS control system 3 (the existing system structure) through a signal cable, the stainless steel pipe 1 is arranged in parallel with the zirconia measuring probe 6, the purge gas is from a compressed air system, the purge gas passes through the control electromagnetic valve 2 and then passes through a tapered nozzle 8 at the front end of the stainless steel pipe 1 with the diameter of 12cm, the ceramic filter 7 is purged, and the control electromagnetic valve 2 receives the instruction of the remote DCS control system 3, so that the automatic control of the whole purging process is realized.
The working method comprises the following steps:
1. when the zirconia measuring probe 6 works normally, the electromagnetic valve 2 is controlled to be in a closed state;
2. when the ceramic filter 7 at the front end of the zirconia measuring probe 6 needs to be cleaned and purged, a remote DCS control system 3 sends an instruction to open the control electromagnetic valve 2, compressed air enters the stainless steel pipe 1 and is purged towards the ceramic filter 7 through a convergent nozzle 8 at the front end of the stainless steel pipe 1;
3. after the purging time is about 2 minutes (the time is adjustable), the remote DCS control system 3 sends out an instruction, the control electromagnetic valve 2 is closed, and the purging is finished;
4, a valve opening purging instruction sent by the DCS control system 3 can be a manual instruction of an operator; or after the oxygen content signal is kept constant for a certain period of time, judging that the oxygen content signal is blocked with ash, and sending a purging instruction; or a timing purging instruction automatically sent by the system after a certain fixed time (such as 24 hours); the above differences are determined by the actual operating conditions.
In addition, it should be noted that the specific embodiments described in the present specification may be different in the components, the shapes of the components, the names of the components, and the like, and the above description is only an example of the structure of the present invention. All the equivalent changes or simple changes made according to the structure, characteristics and principle of the utility model are included in the protection scope of the utility model. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.
Claims (6)
1. The utility model provides a zirconia oxygen content measuring probe intelligence sweeps prevents stifled system which characterized in that: including nonrust steel pipe (1), control solenoid valve (2), DCS control system (3), signal transmitter (4), signal terminal box (5), zirconia measuring probe (6) and ceramic filter (7), the head at zirconia measuring probe (6) is installed in ceramic filter (7), the afterbody at zirconia measuring probe (6) is installed in signal terminal box (5), signal terminal box (5) are connected with signal transmitter (4), signal transmitter (4) are connected with DCS control system (3), DCS control system (3) are connected with control solenoid valve (2), control solenoid valve (2) are connected with nonrust steel pipe (1).
2. The zirconia oxygen measurement probe intelligence of claim 1 sweeps anti-blocking system, its characterized in that: the stainless steel pipe sealing device is characterized by further comprising a nozzle (8) and a valve (9), wherein the nozzle (8) and the valve (9) are respectively arranged at two ends of the stainless steel pipe (1), and the valve (9) is connected with the control electromagnetic valve (2).
3. The zirconia oxygen measurement probe intelligence of claim 2 sweeps anti-blocking system, its characterized in that: the nozzle (8) is a tapered, open-hole nozzle.
4. The zirconia oxygen measurement probe intelligence of claim 1 sweeps anti-blocking system, its characterized in that: the diameter of the stainless steel pipe (1) is 12 cm.
5. The zirconia oxygen measurement probe intelligence of claim 2 sweeps anti-blocking system, its characterized in that: the diameter of the nozzle (8) is 5 cm.
6. The zirconia oxygen measurement probe intelligence of claim 1 sweeps anti-blocking system, its characterized in that: the stainless steel pipe (1) and the zirconia measuring probe (6) are arranged in parallel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921737295.5U CN211424464U (en) | 2019-10-16 | 2019-10-16 | Zirconia oxygen measurement probe intelligence sweeps and prevents stifled system |
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| CN201921737295.5U CN211424464U (en) | 2019-10-16 | 2019-10-16 | Zirconia oxygen measurement probe intelligence sweeps and prevents stifled system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110848739A (en) * | 2019-10-16 | 2020-02-28 | 华电电力科学研究院有限公司 | Intelligent purging anti-blocking system and method for zirconia oxygen content measuring probe |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110848739A (en) * | 2019-10-16 | 2020-02-28 | 华电电力科学研究院有限公司 | Intelligent purging anti-blocking system and method for zirconia oxygen content measuring probe |
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