CN103257205B - Coke oven group oxynitride detection method - Google Patents

Abstract

The invention discloses a coke oven group oxynitride detection method. The method comprises the following steps of: setting two sampling points on two sides of a chimney partition wall in two coke ovens of a coke oven group by adopting a time domain partition sampling technology, respectively carrying out time domain partition batch-type sampling on smoke of the coke oven A and the coke oven B, and respectively measuring the contents of oxynitrides in the coke oven A and the coke oven B and content of oxynitride of total smoke through a model operating system, wherein the contents of oxynitrides of the coke oven A and the coke oven B are used for providing data for technological operation guidance, and the content of oxynitride of the total smoke is used for providing data for environmental protection monitoring. The method provided by the invention uses one set of oxynitride detection equipment for realizing detecting oxynitrides in two ovens, therefore, the equipment investment is reduced, and the measurement accuracy is high.

Description

A kind of coke oven group oxynitride detection method

Technical field

The present invention relates to the detection method of oxides of nitrogen in a kind of coke oven flue gas.

Background technology

In coke oven flue gas, the content of oxides of nitrogen is one of important detected parameters of coke oven technique, the primary discharge gas pollutant important indicator that it or environment protection emission are monitored, heat engineering state to coke oven is detected for the amount of nitrogen oxides in coke oven flue gas, the monitoring of the sealing of condition of a fire condition and coke oven is adjusted to have important directive significance, coke oven running status instantly just can be judged by the content detecting oxides of nitrogen in coke oven flue gas, and make necessary technique adjustment according to its state, make coke oven technique state trend in rationally, coke oven is worked under best state of the art all the time.

Coke oven oxides of nitrogen in the past detects the method adopting single-point to detect more, each measurement point wants a set of independently checkout equipment, so, a coke oven stove group just needs two cover analysis of nitrogen oxide systems according to technological requirement, if consider environment monitoring data, a coke oven stove group just needs three cover analysis of nitrogen oxide systems, and this is for expensive analysis of nitrogen oxide system, considerably increase equipment investment undoubtedly, add business burden.

Summary of the invention

The object of this invention is to provide a kind of coke oven stove group oxides of nitrogen detection method, the method uses a set of oxides of nitrogen checkout equipment, and the oxides of nitrogen that can realize two coke ovens detects, and reduce equipment investment, measuring accuracy is high.

To achieve these goals, the present invention is by the following technical solutions:

A kind of coke oven stove group oxides of nitrogen detection method, the method adopts temporal segmentation Sampling techniques, in chimney partition wall both sides, two sampling spots are arranged to two coke ovens in coke oven stove group, respectively the sampling of temporal segmentation batch (-type) is carried out to the flue gas of coke oven A, coke oven B, the amount of nitrogen oxides of coke oven A, coke oven B and total flue gas is measured respectively by model calculation system, the amount of nitrogen oxides of coke oven A, coke oven B is used for technological operation guidance provides data, and the amount of nitrogen oxides of total flue gas is used for providing data for environment monitoring; Described detection method is completed by coke oven stove group oxides of nitrogen detection system, and coke oven stove group oxides of nitrogen detection system is made up of stainless steel sampling apparatus, intermittent sampling operation valve group, sampling controller, nitrogen-oxide analyzer, model calculation system; Particular content is as follows:

1) stainless steel sampling apparatus is used for the sampling of coke oven flue gas, and stainless steel sampling apparatus is two, is arranged at the both sides of the chimney partition wall between coke oven A, coke oven B respectively;

2) intermittent sampling operation valve group is made up of two fast electromagnetic valves FV1, FV2, and two fast electromagnetic valves FV1, FV2 carry out intermittent sampling under the control of sampling controller, and when sampling to sampling spot 1, FV2 opens, FV1 closes; When sampling to sampling spot 2, FV1 opens, FV2 closes; Intermittent sampling operation valve group realizes two sampling spot batch (-type) samplings;

3) sampling controller is used for carrying out batch (-type) controlling of sampling to intermittent sampling operation valve group, control mechanism is divided into sequential, adopt intermittent sampling mode, when once sampling respectively to two sampled points, be a sampling period (T) this procedure definition, be T/2 to the sampling time of one of them sampled point, the temporal expression for A sampled point is:

$A=\left\{\begin{array}{cc}f\left(A\right)& (n-1)T<t\&le;\mathrm{nT}/2\\ 0& \mathrm{nT}/2<t\&le;\mathrm{nT}\end{array}\right.$

Temporal expression for B sampled point is:

$B=\left\{\begin{array}{cc}f\left(B\right)& \mathrm{nT}/2<t\&le;\mathrm{nT}\\ 0& (n-1)T<t\&le;\mathrm{nT}/2\end{array}\right.$

In formula: n=1,2,3,4......

4) nitrogen-oxide analyzer, is used for accurately measuring the oxides of nitrogen in tested gas, and it is the core that coke oven stove group oxides of nitrogen detects in real time;

5) model calculation system is control, the calculating maincenter of coke oven stove group oxides of nitrogen detection system, it assigns controling parameters to sampling controller, coordinate the controlling of sampling cycle, simultaneously, model calculation system is according to the control cycle of sampling controller, determine that now measured value is the measured value of which sampling spot, and its sampled data is delivered to register, and real-time outputting measurement value signal; The flue gas nitrogen oxide measured value of coke oven A that model calculation system exports and the flue gas nitrogen oxide measured value of coke oven B provide coke oven technological parameter for site operation personnel, as the foundation of technique adjustment and operation; Model calculation system is while control sampling, the flue-gas temperature (Ta, Tb) of coke oven A and coke oven B, pressure (Pa, Pb), flow (Fa, Fb) signal are adopted into model calculation system by it, system compensates the oxides of nitrogen measured value of coke oven A and coke oven B, flue gas flow value respectively according to the temperature of flue gas, pressure, make it to meet the measurement requirement under standard state, and calculate the total flue gas nitrogen oxide concentration value of stove group and total release, for environmental administration provides environment monitoring data.

Compared with prior art, beneficial effect of the present invention is:

1) coke oven stove group oxides of nitrogen detection system adopts temporal segmentation algorithm to carry out intermittent sampling, respectively periodic sampling is carried out to two sampling spots, because amount of nitrogen oxides transport function feature in coke oven flue gas is single order Great inertia system K/ (TS+1), T is very large), so very applicable employing temporal segmentation algorithm carries out intermittent sampling, both the normal measurement of coke furnace system can have been ensured, multiple spot monitoring can be realized again, for enterprise saves a large amount of funds, improve the performance of analysis of nitrogen oxide system.

2) coke oven stove group oxides of nitrogen detection system takes into account again the requirement of environment monitoring, the control algolithm of application of advanced and modelling technique under the prerequisite not increasing equipment, expand functions of the equipments, realize the multi-functional of detection system, both for production technology provides important fabrication evaluation data, again for environmental administration provides environment protection digital, save the part investment of environmental protection tests system (CEMS), reduce business burden, decrease equipment operating cost, for enterprise's reduction consumption, energy-saving and emission-reduction, minimizing investment open a new thinking, add a kind of selection newly.

Accompanying drawing explanation

Fig. 1 is the structural representation of oxides of nitrogen detection system of the present invention.

Embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.

See Fig. 1, a kind of coke oven stove group oxides of nitrogen detection system, is made up of stainless steel sampling apparatus, intermittent sampling operation valve group, sampling controller, nitrogen-oxide analyzer, model calculation system.

Sampling controller controls intermittent sampling operation valve group, and it is divided into control mechanism with sequential, and adopt intermittent sampling mode to replace traditional continuous sampling mode, such sampled-data control system can realize separate unit checkout equipment and measure multiple check point.By the intermittent sampling of intermittent sampling operation valve group, nitrogen-oxide analyzer, is accurately measured the oxides of nitrogen in tested gas.Model calculation system assigns controling parameters to sampling controller, coordinates the control cycle adopted, and meanwhile, it according to the control cycle adopting controller, will determine that now measured value is the measured value of which sampling spot.

A kind of coke oven stove group oxides of nitrogen detection method, the method adopts temporal segmentation Sampling techniques, in chimney partition wall both sides, two sampling spots are arranged to two coke ovens in coke oven stove group, respectively the sampling of temporal segmentation batch (-type) is carried out to the flue gas of coke oven A, coke oven B, the amount of nitrogen oxides of coke oven A, coke oven B and total flue gas is measured respectively by model calculation system, the amount of nitrogen oxides of coke oven A, coke oven B is used for technological operation guidance provides data, and the amount of nitrogen oxides of total flue gas is used for providing data for environment monitoring.

1) intermittent sampling operation valve group is made up of two fast electromagnetic valves (FV1, FV2), and its effect is that fast electromagnetic valve carries out intermittent sampling under the control of sampling controller, and when namely sampling to sampling spot, FV2 opens, FV1 closes.Otherwise when sampling to sampling spot 2, FV1 opens, FV2 closes.Intermittent sampling operation valve group can realize the batch (-type) sampling to two sampling spot samplings.

2) sampling controller controls the sampling of intermittent sampling operation valve group.It is divided into control mechanism with sequential, intermittent sampling mode is adopted to replace traditional continuous sampling mode, such sampled-data control system can realize separate unit checkout equipment and measure multiple check point, complete the Detection task that traditional sense needs multiple devices just can complete, by the performance of detection system to ultimate attainment.

When once sampling respectively to two sampled points, be a sampling period (T) this procedure definition, be T/2 to the sampling time of one of them sampled point, the temporal expression for A sampled point is:

$A=\left\{\begin{array}{cc}f\left(A\right)& (n-1)T<t\&le;\mathrm{nT}/2\\ 0& \mathrm{nT}/2<t\&le;\mathrm{nT}\end{array}\right.$

Temporal expression for B sampled point is:

$B=\left\{\begin{array}{cc}f\left(B\right)& \mathrm{nT}/2<t\&le;\mathrm{nT}\\ 0& (n-1)T<t\&le;\mathrm{nT}/2\end{array}\right.$

In formula: n=1,2,3,4......

3) nitrogen-oxide analyzer, is accurately measured the oxides of nitrogen in tested gas, and it is the core that coke oven stove group oxides of nitrogen detects in real time, and the accuracy of detection of whole system relies on it to ensure.

4) model calculation system is control, the calculating maincenter of coke oven stove group oxides of nitrogen detection system, it will assign controling parameters to employing controller, coordinate the control cycle adopted, simultaneously, it will according to the control cycle of sampling controller, determine that now measured value is the measured value of which sampling spot, and its data are delivered to corresponding register, and real-time outputting measurement value signal; Coke oven A flue gas nitrogen oxide measured value (NOXa) that model calculation system exports and coke oven B flue gas nitrogen oxide measured value (NOXb) provide coke oven technological parameter for site operation personnel, and it can be used as the foundation of technique adjustment and operation.

Model calculation system is while control sampling, the flue-gas temperature (Ta, Tb) of coke oven A and coke oven B, pressure (Pa, Pb), flow (Fa, Fb) signal are adopted into model calculation system 2 by it, system compensates the oxides of nitrogen measured value of coke oven A and coke oven B, flue gas flow value respectively according to the temperature of flue gas, pressure, make it to meet the measurement requirement under standard state, and calculate the total flue gas nitrogen oxide concentration value of stove group and total release, for environmental administration provides environment monitoring data.

Claims (1)

1. a coke oven stove group oxides of nitrogen detection method, it is characterized in that, the method adopts temporal segmentation Sampling techniques, in chimney partition wall both sides, two sampling spots are arranged to two coke ovens in coke oven stove group, respectively the sampling of temporal segmentation batch (-type) is carried out to the flue gas of coke oven A, coke oven B, the amount of nitrogen oxides of coke oven A, coke oven B and total flue gas is measured respectively by model calculation system, the amount of nitrogen oxides of coke oven A, coke oven B is used for technological operation guidance provides data, and the amount of nitrogen oxides of total flue gas is used for providing data for environment monitoring; Described detection method is completed by coke oven stove group oxides of nitrogen detection system, and coke oven stove group oxides of nitrogen detection system is made up of stainless steel sampling apparatus, intermittent sampling operation valve group, sampling controller, nitrogen-oxide analyzer, model calculation system; Particular content is as follows:

1) stainless steel sampling apparatus is used for the sampling of coke oven flue gas, and stainless steel sampling apparatus is two, is arranged at the both sides of the chimney partition wall between coke oven A, coke oven B respectively;

2) intermittent sampling operation valve group is made up of two fast electromagnetic valves FV1, FV2, and two fast electromagnetic valves FV1, FV2 carry out intermittent sampling under the control of sampling controller, and when sampling to A sampled point, FV2 opens, FV1 closes; When sampling to B sampled point, FV1 opens, FV2 closes; Intermittent sampling operation valve group realizes two sampling spot batch (-type) samplings;

3) sampling controller is used for carrying out batch (-type) controlling of sampling to intermittent sampling operation valve group, control mechanism is divided into sequential, adopt intermittent sampling mode, when once sampling respectively to two sampled points, be a sampling period (T) this procedure definition, be T/2 to the sampling time of one of them sampled point, the temporal expression for A sampled point is:

$A=\left\{\begin{array}{cc}{f}_{\left(A\right)}& (n-1)T<t\&le;\mathrm{nT}/2\\ 0& \mathrm{nT}/2<t\&le;\mathrm{nT}\end{array}\right.$

Temporal expression for B sampled point is:

$B=\left\{\begin{array}{cc}{f}_{\left(B\right)}& \mathrm{nT}/2<t\&le;\mathrm{nT}\\ 0& (n-1)T<t\&le;\mathrm{nT}/2\end{array}\right.$

In formula: n=1,2,3,4......

4) nitrogen-oxide analyzer, is used for accurately measuring the oxides of nitrogen in tested gas, and it is the core that coke oven stove group oxides of nitrogen detects in real time;

5) model calculation system is control, the calculating maincenter of coke oven stove group oxides of nitrogen detection system, it assigns controling parameters to sampling controller, coordinate the controlling of sampling cycle, simultaneously, model calculation system is according to the control cycle of sampling controller, determine that now measured value is the measured value of which sampling spot, and its sampled data is delivered to register, and real-time outputting measurement value signal; The flue gas nitrogen oxide measured value of coke oven A that model calculation system exports and the flue gas nitrogen oxide measured value of coke oven B provide coke oven technological parameter for site operation personnel, as the foundation of technique adjustment and operation; Model calculation system is while control sampling, the flue-gas temperature (Ta, Tb) of coke oven A and coke oven B, pressure (Pa, Pb), flow (Fa, Fb) signal are adopted into model calculation system by it, system compensates the oxides of nitrogen measured value of coke oven A and coke oven B, flue gas flow value respectively according to the temperature of flue gas, pressure, make it to meet the measurement requirement under standard state, and calculate the total flue gas nitrogen oxide concentration value of stove group and total release, for environmental administration provides environment monitoring data.