CN103257205A - 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 stove group oxynitrides 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

The content of oxides of nitrogen is one of important detected parameters of coke oven technology in the coke oven flue gas, it still is the main emission gases pollutant important indicator of environment protection emission monitoring, for the heat engineering state of the detection of the amount of nitrogen oxides in the coke oven flue gas to coke oven, transfer the monitoring of the sealing of condition of a fire condition and coke oven that important directive significance is arranged, just can judge coke oven running status instantly by the content that detects oxides of nitrogen in the coke oven flue gas, and make necessary technology adjustment according to its state, the coke oven state of the art is trended towards rationally, coke oven is worked under the best state of the art all the time.

Coke oven oxides of nitrogen in the past detects the methods that adopt single-point to detect more, each measurement point all wants one to overlap independently checkout equipment, so, a coke oven stove group just needs two cover analysis of nitrogen oxide systems according to technological requirement, if taking environmental conservation into consideration Monitoring Data, coke oven stove group just need three cover analysis of nitrogen oxide systems, this is for expensive analysis of nitrogen oxide system, increase equipment investment undoubtedly greatly, increased business burden.

Summary of the invention

The purpose of this invention is to provide a kind of coke oven stove group oxides of nitrogen detection method, this method is used a cover oxides of nitrogen checkout equipment, can realize that the oxides of nitrogen of two coke ovens detects, and has reduced equipment investment, the measuring accuracy height.

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, this method adopts time domain to cut apart Sampling techniques, two coke ovens in the coke oven stove group are arranged two sampling spots in chimney partition wall both sides, respectively the flue gas of coke oven A, coke oven B is carried out time domain and cut apart the batch (-type) sampling, measure the amount of nitrogen oxides of coke oven A, coke oven B and total flue gas respectively by the model calculation system, the amount of nitrogen oxides of coke oven A, coke oven B is used for the technological operation guidance provides data, and the amount of nitrogen oxides of total flue gas is used to environment monitoring that data are provided; Described detection method is finished 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) the stainless steel sampling apparatus is used for the sampling of coke oven flue gas, and the stainless steel sampling apparatus is two, is arranged at the both sides of the chimney partition wall between coke oven A, the coke oven B respectively;

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

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

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

Temporal expression for the 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 the formula: n=1,2,3,4......

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

5) the model calculation system is control, the calculating maincenter of coke oven stove group oxides of nitrogen detection system, it assigns the control parameter to sampling controller, coordinate the controlling of sampling cycle, simultaneously, the model calculation system is according to the control cycle of sampling controller, determine that this moment, measured value was 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 the coke oven A of model calculation system output and the flue gas nitrogen oxide measured value of coke oven B provide the coke oven technological parameter for the site operation personnel, as the foundation of technology adjustment and operation; The model calculation system is in the control sampling, it adopts flue-gas temperature (Ta, Tb), pressure (Pa, Pb), flow (Fa, the Fb) signal of coke oven A and coke oven B into to the model calculation system, system compensates oxides of nitrogen measured value, the flue gas flow value of coke oven A and coke oven B respectively according to temperature, the pressure of flue gas, make it to meet the measurement requirement under the standard state, and calculate flue gas nitrogen oxide concentration value and a total release that the stove group is total, for environmental administration provides the 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 the time domain partitioning algorithm to carry out intermittent sampling, respectively two sampling spots are carried out periodic sampling, because amount of nitrogen oxides transport function characteristics are the big inertia system K/ of single order (TS+1) in the coke oven flue gas, T is very big), so very suitable employing time domain partitioning algorithm carries out intermittent sampling, both can guarantee the normal measurement of coke furnace system, can realize the multiple spot monitoring again, for enterprise has saved a large amount of funds, promoted the performance of analysis of nitrogen oxide system.

2) coke oven stove group oxides of nitrogen detection system is taken into account the requirement of environment monitoring again, the control algolithm of application of advanced and modelling technique under the prerequisite that does not increase equipment, expand functions of the equipments, realize the multi-functional of detection system, both for providing important technology, production technology detected data, provide environment protection digital for environmental administration again, saved the part investment of environmental protection tests system (CEMS), reduced business burden, reduced equipment operating cost, open a new thinking for enterprise's reduction consumption, energy-saving and emission-reduction, minimizing investment, increased a kind of new selection.

Description of drawings

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

Embodiment

Below in conjunction with accompanying drawing the specific embodiment of the present invention 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 is controlled intermittent sampling operation valve group, and it is divided into control mechanism with sequential, adopts the intermittent sampling mode to replace traditional continuous sampling mode, and such sampled-data control system can realize that the separate unit checkout equipment measures a plurality of check points.By the intermittent sampling of intermittent sampling operation valve group, nitrogen-oxide analyzer, is accurately measured the oxides of nitrogen in the tested gas.The control parameter is assigned to sampling controller by the model calculation system, coordinates the control cycle of employing, and simultaneously, it will determine that this moment, measured value was the measured value of which sampling spot according to the control cycle that adopts controller.

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

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

2) sampling controller is sampled to intermittent sampling operation valve group and is controlled.It is divided into control mechanism with sequential, adopt the intermittent sampling mode to replace traditional continuous sampling mode, such sampled-data control system can realize that the separate unit checkout equipment measures a plurality of check points, finish the detection task that needs multiple devices just can finish on the traditional sense, perform to the performance of detection system ultimate attainment.

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

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

Temporal expression for the 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 the formula: n=1,2,3,4......

3) nitrogen-oxide analyzer, is accurately measured the oxides of nitrogen in the 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 total system relies on it to guarantee.

4) the model calculation system is control, the calculating maincenter of coke oven stove group oxides of nitrogen detection system, it will assign the control parameter to adopting controller, coordinate the control cycle of employing, simultaneously, it will be according to the control cycle of sampling controller, determine that this moment, measured value was the measured value of which sampling spot, and its data are delivered to corresponding register, and real-time outputting measurement value signal; The coke oven A flue gas nitrogen oxide measured value (NO of model calculation system output _XA) with coke oven B flue gas nitrogen oxide measured value (NO _XB) for the site operation personnel provides the coke oven technological parameter, it can be used as the foundation of technology adjustment and operation.

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

Claims (1)

1. coke oven stove group oxides of nitrogen detection method, it is characterized in that, this method adopts time domain to cut apart Sampling techniques, two coke ovens in the coke oven stove group are arranged two sampling spots in chimney partition wall both sides, respectively the flue gas of coke oven A, coke oven B is carried out time domain and cut apart the batch (-type) sampling, measure the amount of nitrogen oxides of coke oven A, coke oven B and total flue gas respectively by the model calculation system, the amount of nitrogen oxides of coke oven A, coke oven B is used for the technological operation guidance provides data, and the amount of nitrogen oxides of total flue gas is used to environment monitoring that data are provided; Described detection method is finished 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) the stainless steel sampling apparatus is used for the sampling of coke oven flue gas, and the stainless steel sampling apparatus is two, is arranged at the both sides of the chimney partition wall between coke oven A, the coke oven B respectively;

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

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

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

Temporal expression for the B sampled point is:

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

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

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

5) the model calculation system is control, the calculating maincenter of coke oven stove group oxides of nitrogen detection system, it assigns the control parameter to sampling controller, coordinate the controlling of sampling cycle, simultaneously, the model calculation system is according to the control cycle of sampling controller, determine that this moment, measured value was 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 the coke oven A of model calculation system output and the flue gas nitrogen oxide measured value of coke oven B provide the coke oven technological parameter for the site operation personnel, as the foundation of technology adjustment and operation; The model calculation system is in the control sampling, it adopts flue-gas temperature (Ta, Tb), pressure (Pa, Pb), flow (Fa, the Fb) signal of coke oven A and coke oven B into to the model calculation system, system compensates oxides of nitrogen measured value, the flue gas flow value of coke oven A and coke oven B respectively according to temperature, the pressure of flue gas, make it to meet the measurement requirement under the standard state, and calculate flue gas nitrogen oxide concentration value and a total release that the stove group is total, for environmental administration provides the environment monitoring data.

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