CN102654759A - Method for controlling thermal value of mixed gas - Google Patents
Method for controlling thermal value of mixed gas Download PDFInfo
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- CN102654759A CN102654759A CN2012101258793A CN201210125879A CN102654759A CN 102654759 A CN102654759 A CN 102654759A CN 2012101258793 A CN2012101258793 A CN 2012101258793A CN 201210125879 A CN201210125879 A CN 201210125879A CN 102654759 A CN102654759 A CN 102654759A
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Abstract
The invention relates to a method for controlling a thermal value of mixed gas. The method comprises the following steps of: firstly, inputting a thermal value and a flow needed by a user into a programmable controller as a set value, respectively detecting the flow and the thermal value of the gas in each gas pipeline and inputting the thermal value and the flow into the programmable controller, calculating the thermal value of the mixed gas to serve as a feedback value by using the programmable controller, inputting the feedback value and the set value into an adjuster, and adopting the adjuster to adjust the opening degree of a valve position by using a difference value obtained after comparing the feedback value with the set value. According to the method, the thermal value and the flow of the gas are detected firstly before the gas is input into a mixed station, and the gas can be adjusted before entering the mixed station, so that the speed for controlling the thermal value and the flow of the output gas by adopting the method is pretty high.
Description
Technical field
The present invention relates to a kind of method that is used to control mixed gas calorific value
Background technology
The gas that
mixed gas is made up of after mixing two or more coal gas is used to satisfy the calorific value of gas of user's needs.In order to adjust the calorific value of coal gas; By mixing the station high heating value gas and low-heat value gas are mixed the back so that the coal gas of its output reaches the required calorific value of gas of user; And calorific value and flow by the mixed gas that mixes station output must be stablized; Therefore, coal gas mixing station is provided with conditioning equipments such as calorific value and flow coal gas is regulated.Calorific value is regulated and is adopted higher calorific value coal gas and these two kinds of different calorific value of gas of low heating value coal gas usually, carries out mixing match according to a certain percentage through two parallel pipelines, uses to supply with the front end user.
are mixed the station and are had one and be used for the coal gas mixing chamber, are provided with higher calorific value coal gas and two gas inlet pipe roads of low heating value coal gas at the input end of coal gas mixing chamber, at its output terminal caloric value instrument are installed.In the prior art; The method that detects mixed gas calorific value at first is that the calorific value that the user needs is input in the Programmable Logic Controller as setting value; Again the detected calorific value of caloric value instrument is sent in the Programmable Logic Controller as value of feedback; Programmable Logic Controller compares the poor of setting value and value of feedback; Through the allocate amount of the control valve opening on the adjusting high combustion value coal feed channel with the control high heating value gas, let outlet mixed gas calorific value detected value equal setting value in advance, reach the purpose of control outlet calorific value thus.But; Because caloric value instrument is arranged on the output terminal of coal gas mixing chamber, when having gap with its detected calorific value of gas and setting value, even if can regulate the control valve opening on the high combustion value coal feed channel apace; And the calorific value of gas of preserving in the coal gas mixing chamber can not be by the output of adjustment back; So, utilize the method adjustment output calorific value of gas of this kind detection mixed gas calorific value to have hysteresis quality, can make the calorific value of output coal gas unstable; Simultaneously, because of caloric value instrument is unique parts that value of feedback is provided for Programmable Logic Controller, if frequent maintenance not; When it breaks down; Caloric value instrument will be exported fixing lower limit, and the variable valve aperture very that this can cause on the high combustion value coal feed channel causes and regulates failure.
Summary of the invention:
task of the present invention provides a kind of the utilization and mixes station input end calorific value of gas and flow solve problems such as hysteresis quality and adjusting be unfavorable as the mode of value of feedback the method that is used to control mixed gas calorific value.
The method of the control mixed gas calorific value that
are proposed by the invention may further comprise the steps: at first calorific value and the flow with the required coal gas of user is input in the Programmable Logic Controller as setting value; Detect the flow and the calorific value of coal gas in each root gaspipe line then respectively and be entered in the Programmable Logic Controller; Utilize calorific value that Programmable Logic Controller calculates mixed gas as value of feedback; Value of feedback and setting value are input in the regulator, the aperture of valve position was regulated in the difference adjustment of gained after regulator was compared with value of feedback and setting value again.
Said coal gas adopts high heating value gas and low-heat value gas, and the value of feedback that Programmable Logic Controller calculates two kinds of coal gas adopts following formula:
In the formula:
,
The method of the control mixed gas calorific value that
are proposed by the invention is before coal gas is input to the mixing station, to detect calorific value of gas and flow earlier; If there are gap in mixed calorific value of gas and flow and setting value; The coal gas of input just can be adjusted before not getting into the mixing station; So, adopt this kind method control output calorific value of gas and flow speed quite fast, and the calorific value of output coal gas is relatively stable; Simultaneously, because of calorific value of gas and the flow that detects can directly detect from flow-through orifice, and flow-through orifice is a kind of non-damageable parts; Without frequent maintenance; So variable valve problem out of control can not appear in this kind method, can reduce the detection cost of mixed gas calorific value and flow.
Description of drawings:
Accompanying drawing 1 is the process flow diagram that mixes the station in the method for control mixed gas calorific value proposed by the invention;
accompanying drawing 2 is theory diagrams of Control Component.
Embodiment:
referring to Fig. 1 and Fig. 2, these two accompanying drawings provide the method process flow diagram of control mixed gas calorific value proposed by the invention.As can be seen from Figure 1; Mix the station and comprise coal gas mixing chamber 1; The input end of this coal gas mixing chamber 1 is provided with two gas inlet pipe roads, and wherein, the gas inlet pipe road is a high combustion value coal air pipe 2; The gas inlet pipe road is a low calorific value coal air pipe 3, and a variable valve 4 and flow-through orifice 5 all are installed on high combustion value coal air pipe 2 and low calorific value coal air pipe 3.Control Component comprises Programmable Logic Controller PLC and regulator PID.
When control mixed gas calorific value and flow; Calorific value and flow with the required coal gas of user is input among the Programmable Logic Controller PLC as setting value earlier; Detect the flow and the calorific value of high combustion value coal air pipe 2 and low calorific value coal air pipe 3 interior coal gas then respectively through flow-through orifice 5; And the calorific value of gas and the data on flows that detect be input in the Programmable Logic Controller PLC, Programmable Logic Controller PLC calculates mixed gas calorific value according to following formula:
In the formula:
,
The calorific value that
will calculate mixed gas is as value of feedback; Again value of feedback and setting value are input among the regulator PID; The aperture of valve position 4 was regulated in the difference adjustment of gained after regulator PID compared with value of feedback and setting value, thereby value of feedback is dwindled with the gap between the setting value or approaching equating.
Claims (2)
1. control the method for mixed gas calorific value, it is characterized in that may further comprise the steps:
At first calorific value and the flow with the required coal gas of user is input in the Programmable Logic Controller as setting value; Detect the flow and the calorific value of coal gas in each root gaspipe line then respectively and be entered in the Programmable Logic Controller; Utilize calorific value that Programmable Logic Controller calculates mixed gas as value of feedback; Value of feedback and setting value are input in the regulator, the aperture of valve position was regulated in the difference adjustment of gained after regulator was compared with value of feedback and setting value again.
2. method according to claim 1; It is characterized in that: said coal gas adopts high heating value gas and low-heat value gas, and the value of feedback that Programmable Logic Controller calculates two kinds of coal gas adopts following formula:
In the formula:
,
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101258793A CN102654759A (en) | 2012-04-26 | 2012-04-26 | Method for controlling thermal value of mixed gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101258793A CN102654759A (en) | 2012-04-26 | 2012-04-26 | Method for controlling thermal value of mixed gas |
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| CN102654759A true CN102654759A (en) | 2012-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012101258793A Pending CN102654759A (en) | 2012-04-26 | 2012-04-26 | Method for controlling thermal value of mixed gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112444326A (en) * | 2019-08-27 | 2021-03-05 | 宝山钢铁股份有限公司 | Method for calculating heat value of mixed gas |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062919A (en) * | 1991-01-03 | 1992-07-22 | 山西太原钢铁公司 | The method of control calorific value pressure of mixed gases |
| CN2325807Y (en) * | 1997-04-15 | 1999-06-23 | 王政民 | Full adjusting and intelligent type mixed gas heating effect controlling instrument |
| CN1952481A (en) * | 2005-10-18 | 2007-04-25 | 中南大学 | Intelligent decoupling control method by pressurizing with mixed coal gas |
| WO2010044958A1 (en) * | 2008-10-14 | 2010-04-22 | Exxonmobil Upstream Research Company | Methods and systems for controlling the products of combustion |
| US20110126545A1 (en) * | 2009-11-30 | 2011-06-02 | General Electric Company | Systems and methods for controlling fuel mixing |
-
2012
- 2012-04-26 CN CN2012101258793A patent/CN102654759A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062919A (en) * | 1991-01-03 | 1992-07-22 | 山西太原钢铁公司 | The method of control calorific value pressure of mixed gases |
| CN2325807Y (en) * | 1997-04-15 | 1999-06-23 | 王政民 | Full adjusting and intelligent type mixed gas heating effect controlling instrument |
| CN1952481A (en) * | 2005-10-18 | 2007-04-25 | 中南大学 | Intelligent decoupling control method by pressurizing with mixed coal gas |
| WO2010044958A1 (en) * | 2008-10-14 | 2010-04-22 | Exxonmobil Upstream Research Company | Methods and systems for controlling the products of combustion |
| US20110126545A1 (en) * | 2009-11-30 | 2011-06-02 | General Electric Company | Systems and methods for controlling fuel mixing |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112444326A (en) * | 2019-08-27 | 2021-03-05 | 宝山钢铁股份有限公司 | Method for calculating heat value of mixed gas |
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Application publication date: 20120905 |