CN103677025A - On-line monitoring and controlling system used for sodium hypochlorite production - Google Patents
On-line monitoring and controlling system used for sodium hypochlorite production Download PDFInfo
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- CN103677025A CN103677025A CN201310709997.3A CN201310709997A CN103677025A CN 103677025 A CN103677025 A CN 103677025A CN 201310709997 A CN201310709997 A CN 201310709997A CN 103677025 A CN103677025 A CN 103677025A
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Abstract
The invention discloses an on-line monitoring and controlling system used for sodium hypochlorite production. The on-line monitoring and controlling system is characterized in that according to the on-line monitoring and controlling system, a circulation liquid temperature monitoring system, a circulation liquid pH value monitoring system and a gas inlet flow monitoring system are respectively arranged on a gas-liquid inlet of a sodium hypochlorite reaction tower. Meanwhile, the gas-liquid inlet is provided with a gaseous phase self-control valve connected with a flow and valve control module, by the adoption of the structure, the on-line monitoring and controlling system can perform real-time detection in the sodium hypochlorite production process, and the reaction time of the sodium hypochlorite production is controlled to ensure product quality.
Description
Technical field
The present invention relates to the production of sodium hypochlorite, particularly a kind of on-line monitoring and control system of producing for sodium hypochlorite.
Background technology
Liquor natrii hypochloritis is widely used in the bleaching agent of the industries such as weaving, papermaking, the sanitizer of potable water, swimming pool etc., and other industrial circle is as chlorating agent, oxygenant, purposes is very extensive.The production of sodium hypochlorite is mainly to obtain by sodium hydroxide solution and chlorine reaction.Its production technology can be divided into continuous production processes and batch production technique.Be no matter continuity method or batch process, production run all adopts NaOH and the chlorine reaction of 15% left and right, generates the sodium hypochlorite product that available chlorine content > 10%, NaOH cross alkali number < 1%.
In course of reaction, in order to obtain qualified product, need to detect course of reaction and terminating point: temperature of reaction is too high makes product quality defective with the too low product accelerated decomposition that all will cause of mistake alkali number.But logical chlorine dose and reaction terminating point in the batch reaction production runes such as current sodium hypochlorite can not carry out effective on-line continuous detection and control, conventionally can only be by manually obtaining to on-the-spot valve-off and laboratory sampling analysis.Therefore, in the reaction later stage, need frequently scene controlled valve and sample analysis manually, workload is large, efficiency is low; Scene manually controlled valve makes air inflow and inlet period be difficult to hold; And the human factor of manual analysis is inevitably, sample analysis also certainly exists certain hysteresis sooner, thereby very little to the directive significance of producing.
For the problems referred to above, a kind of novel monitoring and control system are provided, when producing, sodium hypochlorite detects in real time, and controlling its reaction end is the problem that prior art need to solve.
Summary of the invention
Technical matters to be solved by this invention is, a kind of on-line monitoring and control system of producing for sodium hypochlorite is provided, and when sodium hypochlorite is produced, detects in real time, controls its reaction end.
For achieving the above object, technical scheme of the present invention is a kind of on-line monitoring and control system of producing for sodium hypochlorite, it is characterized in that: described monitoring and control system are respectively equipped with circulation fluid temperature monitoring system, circulation fluid pH value monitoring system, charge flow rate monitoring system in the gas-liquid import of sodium hypochlorite reaction tower; Gas phase import is provided with internally piloted valve connection traffic and valve control module simultaneously, thereby realizes real-time detection and the control that sodium hypochlorite is produced.
During the high value of temperature that described circulation fluid temperature monitoring system surpass to be set at the real time temperature monitoring, the valve closing of gas phase internally piloted valve, cessation reaction.
Described circulation fluid pH value monitoring system when monitoring pH value and surpass to set PH minimum, the valve closing of gas phase internally piloted valve, cessation reaction.
Described circulation fluid pH value monitoring system and circulation fluid temperature monitoring system are that OR interlock method is connected with gas phase internally piloted valve, as long as a condition meets to carry out, close the action of gas phase internally piloted valve interlocking.
Described circulation fluid pH value monitoring system and circulation fluid temperature monitoring system connect respectively DCS host computer, in the setting of the enterprising line correlation parameter of DCS host computer.
On-line monitoring and a control system of for sodium hypochlorite, producing, owing to adopting above-mentioned structure, the present invention can detect in real time when sodium hypochlorite is produced, controls its reaction end, guarantees the quality of product.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation;
Fig. 1 is a kind of on-line monitoring and control system structural representation of producing for sodium hypochlorite of the present invention;
Fig. 2 is a kind of on-line monitoring and control system logical interlock figure producing for sodium hypochlorite of the present invention.
Embodiment
In the production run of sodium hypochlorite, along with the carrying out of reaction, reactant liquor is crossed alkali number content and is changed and will cause the variation of reacting liquid pH value, therefore can be obtained by pH value the information of alkali number content; If the carrying out excessive reaction of air inflow in real time along with reaction acutely can produce amount of heat simultaneously, can make reacting liquid temperature surpass and control the sodium hypochlorite decomposition that index is impelled to generate.If can not stop in time air inlet meeting during to the terminating point of reaction along with the carrying out of reaction, cause in reactant liquor crossing alkali number and reduce, liquor natrii hypochloritis, self is decomposing and is impelling decomposition to aggravate cross alkali number protection in the situation that without certain.Based on above-mentioned principle, the object of the invention is to overcome deficiency of the prior art and utilize the collecting and distributing On-line Control technology of DCS, a kind of on-line monitoring and control system of producing for sodium hypochlorite is provided, make it adopt conventional instrument to obtain in real time temperature of reaction, pH value and to lead to the information such as chlorine valve opening online, and these three information signals are carried out to interlocked control.
The present invention is respectively equipped with circulation fluid temperature monitoring system, circulation fluid pH value monitoring system, charge flow rate monitoring system in the gas-liquid import of sodium hypochlorite reaction tower; Gas phase import is provided with gas phase internally piloted valve connection traffic and valve control module simultaneously, thereby realizes real-time detection and the control that sodium hypochlorite is produced.
During the high value of temperature that circulation fluid temperature monitoring system surpass to be set at the real time temperature monitoring, the valve closing of gas phase internally piloted valve, cessation reaction.Circulation fluid PH meter monitoring system is when monitoring pH value over setting PH minimum, and gas phase internally piloted valve is closed, cessation reaction.Circulation fluid pH value monitoring system and circulation fluid temperature monitoring system are that OR interlock method is connected with gas phase internally piloted valve, as long as a condition meets to carry out, close the action of gas phase internally piloted valve interlocking.
Circulation fluid pH value monitoring system and circulation fluid temperature monitoring system connect respectively DCS host computer, in the setting of the enterprising line correlation parameter of DCS host computer.
Specifically as shown in Figure 1-2, a monitoring temperature point and a pH value control point are set on the feed liquor circulation pipe of sodium hypochlorite reaction tower, a gas orifice flowmeter and an internally piloted valve are set in draft tube.And by circulation fluid temperature monitoring system, circulation fluid pH value monitoring system, charge flow rate monitoring system access Distributed Control System (DCS).
Said temperature interlocking value is set as to 35 ℃, and pH value interlocking value is set as 12.4(interlocking value and obtains according to producing analysis data).Prepare after 15% alkali lye, start ebullator, set chlorine technological requirement flow and also drop into automatic control state, when pH reaches 12.4, interlocking close air inlet internally piloted valve, makes reaction terminating; Or if abnormal conditions appear in production run, temperature of reaction raises and reaches 35 ℃ of interlocking close air inlet internally piloted valves.
During the present invention has effectively avoided in the past producing, scene controlled valve and sample analysis manually frequently in product resolution problem and production run, has improved work efficiency.
By reference to the accompanying drawings the present invention is exemplarily described above; obviously specific implementation of the present invention is not subject to the restrictions described above; as long as the various improvement that adopted technical solution of the present invention to carry out, or directly apply to other occasion without improvement, all within protection scope of the present invention.
Claims (5)
1. on-line monitoring and a control system of for sodium hypochlorite, producing, is characterized in that: described monitoring and control system are that the gas-liquid import of sodium hypochlorite reaction tower is respectively equipped with circulation fluid temperature monitoring system, circulation fluid pH value monitoring system, charge flow rate monitoring system; Gas phase import is provided with gas phase internally piloted valve connection traffic and valve control module simultaneously.
2. a kind of on-line monitoring and control system of producing for sodium hypochlorite according to claim 1, it is characterized in that: described circulation fluid temperature monitoring system is when the real time temperature monitoring surpasses the high value of temperature of setting, internally piloted valve is closed, cessation reaction.
3. a kind of on-line monitoring and control system of producing for sodium hypochlorite according to claim 1, is characterized in that: described circulation fluid pH value monitoring system is when monitoring pH value over setting PH minimum, and internally piloted valve is closed, cessation reaction.
4. a kind of on-line monitoring and control system of producing for sodium hypochlorite according to claim 1, it is characterized in that: described circulation fluid pH value monitoring system and circulation fluid temperature monitoring system are that OR interlock method is connected with gas phase internally piloted valve close the action of gas phase internally piloted valve interlocking as long as a condition meets to carry out.
5. a kind of on-line monitoring and control system of producing for sodium hypochlorite according to claim 1, it is characterized in that: described circulation fluid pH value monitoring system and circulation fluid temperature monitoring system connect respectively DCS host computer, in the setting of the enterprising line correlation parameter of DCS host computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310709997.3A CN103677025A (en) | 2013-12-19 | 2013-12-19 | On-line monitoring and controlling system used for sodium hypochlorite production |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310709997.3A CN103677025A (en) | 2013-12-19 | 2013-12-19 | On-line monitoring and controlling system used for sodium hypochlorite production |
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| CN103677025A true CN103677025A (en) | 2014-03-26 |
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| CN201310709997.3A Pending CN103677025A (en) | 2013-12-19 | 2013-12-19 | On-line monitoring and controlling system used for sodium hypochlorite production |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115093498A (en) * | 2022-06-17 | 2022-09-23 | 中盐安徽红四方股份有限公司 | Preparation method of low-residual-monomer and low-chroma PVP |
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| CN2910893Y (en) * | 2006-06-30 | 2007-06-13 | 华南理工大学 | Equipment for producing sodium hypochlorite |
| CN201402419Y (en) * | 2009-03-30 | 2010-02-10 | 山东省科学院生物研究所 | Intelligent pH value and temperature control system for industrial fermentation |
| CN102701157A (en) * | 2012-06-19 | 2012-10-03 | 北京万水净水剂有限公司 | Method and device for producing sodium hypochlorite |
| CN202829571U (en) * | 2012-02-28 | 2013-03-27 | 北京万水净水剂有限公司 | Integrated sodium hypochlorite production device |
| CN203247135U (en) * | 2013-04-18 | 2013-10-23 | 青岛科技大学 | Multiple operating parameters measuring and controlling device for treating sewage through aerobe method |
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2013
- 2013-12-19 CN CN201310709997.3A patent/CN103677025A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2910893Y (en) * | 2006-06-30 | 2007-06-13 | 华南理工大学 | Equipment for producing sodium hypochlorite |
| CN201402419Y (en) * | 2009-03-30 | 2010-02-10 | 山东省科学院生物研究所 | Intelligent pH value and temperature control system for industrial fermentation |
| CN202829571U (en) * | 2012-02-28 | 2013-03-27 | 北京万水净水剂有限公司 | Integrated sodium hypochlorite production device |
| CN102701157A (en) * | 2012-06-19 | 2012-10-03 | 北京万水净水剂有限公司 | Method and device for producing sodium hypochlorite |
| CN203247135U (en) * | 2013-04-18 | 2013-10-23 | 青岛科技大学 | Multiple operating parameters measuring and controlling device for treating sewage through aerobe method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115093498A (en) * | 2022-06-17 | 2022-09-23 | 中盐安徽红四方股份有限公司 | Preparation method of low-residual-monomer and low-chroma PVP |
| CN115093498B (en) * | 2022-06-17 | 2023-05-26 | 中盐安徽红四方股份有限公司 | Preparation method of PVP (polyvinyl pyrrolidone) with low residual monomer and low chromaticity |
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Application publication date: 20140326 |