CN204786536U - Coal pit temperature control system - Google Patents

Abstract

The utility model discloses a coal pit temperature control system, estimate the device including feeding coal volume controlling means, reference orbit input device, operation part, calorific value detection device, hello coal volume detection device and calorific value, calorific value detection device with feed coal volume detection device all with the operation part is connected, the calorific value estimate the device with it is connected to feed coal volume controlling means. The utility model discloses a current coal pit calorific value of calorific value detection device detection feeds back to the operation part with this value, through the current coal magnitude of feeding of hello coal volume detection device detection, the operation part is fed the coal magnitude and is referred to the orbit and operate with current according to current coal pit calorific value, again according to computation result to feed coal volume controlling means and send control command, feed coal volume controlling means the basis the coal volume is fed in control command control to the calorific value control that can reach the coal pit is more accurate, improves production efficiency.

Description

Coal pit temperature control system

Technical field

The utility model relates to automatic control technology field, particularly relates to the coal pit temperature control system in cement plant etc.

Background technology

Rotary cement kiln is the capital equipment of cement plant calcining high-mark cement, and its effect is that raw material are sintered into clinker, controls to be important production technology in production process to the temperature of rotary kiln.As everyone knows, there is various temperature control method in prior art, as China Intellectual Property Office discloses optimization control method of temperature gradient in a kind of rotary kiln on July 24th, 2013, its publication number is CN103217013A.Optimization control method of temperature gradient in this rotary kiln, be provided with kiln end temperature controller, kiln head and tail differential temperature controller, temperature of kiln head measuring transducer, kiln end temperature measuring transducer, fuel flow rate setting apparatus, fuel flow controller, fuel flow rate is measured and actuator, wind flow setting apparatus, wind flow controller, wind flow is measured and actuator, raw material flow measuring transducer, the field instruments such as kiln tail kiln inner pressure measuring transducer, raw material flow is as an input of fuel flow rate setting apparatus, it is fuel flow rate setting value that setting apparatus exports, setting curve sets by design data or operating experience, the output of this setting apparatus and kiln end temperature controller, the output sum of kiln head and tail differential temperature controller is as the setting value of fuel flow controller, each controller adopts pid algorithm or other control algolithm, realize the closed-loop control of fuel flow rate.Although this control method can realize the closed-loop control of fuel flow rate, do not consider that cement plant coal calorific value often changes the impact brought control system model accuracy, cause control effects inaccurate, production efficiency is low.

Utility model content

The purpose of this utility model is to provide a kind of coal pit temperature control system.

Coal pit temperature control system described in the utility model, comprises and feeds coal amount control device and reference locus input unit, can control to feed coal amount thus the temperature controlling coal pit according to reference locus; It is characterized in that: also comprise arithmetic unit, calorific value checkout gear, feed coal amount detecting device and calorific value estimation unit; Described calorific value checkout gear is all connected with described arithmetic unit with hello coal amount detecting device; Described calorific value estimation unit is connected with described coal amount control device of feeding.

Described arithmetic unit comprises deviation computing module, for the standard coal calorific value Q calculating current coal calorific value Q (k) and arrange ₀between absolute difference, thus obtain coal calorific value straggling parameter value.Described arithmetic unit comprises current coal calorific value computing module, comprises the kiln tail current coal calorific value arithmetic element for calculating current coal calorific value Q1 (k) of kiln tail and the kiln hood current coal calorific value arithmetic element for calculating current coal calorific value Q2 (k) of kiln hood; Described kiln tail current coal calorific value arithmetic element comprises: the first computing module, calculates described first parameter value and the second parameter value for the detected value exported according to described calorific value checkout gear, hello coal amount detecting device.Described arithmetic unit comprises the second computing module, for according to described first parameter value second parameter value and experiment coal calorific value calculation goes out the 3rd parameter value 4th parameter value and the 5th parameter value described arithmetic unit also comprises coal calorific value computing module, for according to the first parameter value second parameter value 3rd parameter value 4th parameter value with the 5th parameter value calculate coal calorific value Q1 (k) in k moment.

Coal pit temperature control system described in the utility model, detect current coal pit calorific value by calorific value checkout gear and this value is fed back to arithmetic unit, current hello coal value is detected by feeding coal amount detecting device, described arithmetic unit carries out computing according to current coal pit calorific value and current coal value and the reference locus of feeding, coal amount control device sending controling instruction is fed to described again according to operation result, described coal amount control device of feeding controls to feed coal amount according to described control instruction, thus the calorific value that can reach coal pit controls more accurately, to enhance productivity.

Accompanying drawing explanation

Fig. 1 is the coal pit temperature control system model schematic described in the utility model embodiment one;

Fig. 2 is the coal pit temperature control system structural representation described in the utility model embodiment one.

Detailed description of the invention

For making the object of the utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the utility model embodiment, technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.

As shown in Figure 1, the present embodiment provides a kind of coal pit temperature control system, comprises and feeds coal amount control device and reference locus input unit, can control to feed coal amount thus the temperature controlling coal pit according to reference locus; It is characterized in that: also comprise arithmetic unit, calorific value checkout gear, feed coal amount detecting device and calorific value estimation unit; Described calorific value checkout gear is all connected with described arithmetic unit with hello coal amount detecting device; Described calorific value estimation unit is connected with described coal amount control device of feeding.It will be understood by those skilled in the art that actual calorific value in coal pit and temperature can change along with various process conditions, affect temperature and control to carry out according to reference locus; Coal pit temperature control system described in the present embodiment, detect current coal pit calorific value by calorific value checkout gear and this value is fed back to arithmetic unit, current hello coal value is detected by feeding coal amount detecting device, described arithmetic unit carries out computing according to current coal pit calorific value and current coal value and the reference locus of feeding, coal amount control device sending controling instruction is fed to described again according to operation result, described coal amount control device of feeding controls to feed coal amount according to described control instruction, thus the calorific value that can reach coal pit controls more accurately, to enhance productivity.

Described arithmetic unit comprises deviation computing module, for the standard coal calorific value Q calculating current coal calorific value Q (k) and arrange ₀between absolute difference, thus obtain coal calorific value straggling parameter value; It will be understood by those skilled in the art that described coal calorific value straggling parameter value △ Q=|Q (k)-Q ₀|.

Described arithmetic unit comprises current coal calorific value computing module, comprises the kiln tail current coal calorific value arithmetic element for calculating current coal calorific value Q1 (k) of kiln tail and the kiln hood current coal calorific value arithmetic element for calculating current coal calorific value Q2 (k) of kiln hood; It will be understood by those skilled in the art that described current coal calorific value Q (k) draws according to following operational model computing:

Q(k)＝αQ ₁(k)+(1-α)Q ₂(k)

Wherein, parameter alpha be weight coefficient, r be arrange tolerance threshold; If | Q (k)-Q ₀| <r, then do not change current coal calorific value; If | Q (k)-Q ₀|>=r, then carry out debugging control.Standard calorific value Q ₀refer to debugging period, be used for picking out the coal calorific value that system model parameter adopts.

Described kiln tail current coal calorific value arithmetic element comprises:

First computing module, calculates described first parameter value and the second parameter value for the detected value exported according to described calorific value checkout gear, hello coal amount detecting device.It will be understood by those skilled in the art that described calorific value checkout gear can detect in the k moment and feed coal amount parameter X1 (k), coal amount incrementation parameter △ X1 (k), temperature parameter Y1 (k) and temperature increase parameter △ Y1 (k); Described first computing module calculates the first parameter value according to following first operational model and the second operational model with the second parameter value

Described first operational model is:

$\mathrm{\&Delta;}{y}_1\left(k\right)=b_0^1\left(k\right)+b_1^1\left(k\right){\mathrm{\&Delta;x}}_1\left(k\right)$

Described second operational model is:

$\left[\begin{array}{cc}n& \mathrm{\&Sigma;}{\mathrm{\&Delta;x}}_1\left(i\right)\\ \mathrm{\&Sigma;}{\mathrm{\&Delta;}x}_1\left(i\right)& \mathrm{\&Sigma;}{\mathrm{\&Delta;x}}_1{\left(i\right)}^2\end{array}\right]\left[\begin{array}{c}{b}_0^1\left(k\right)\\ b_1^1\left(k\right)\end{array}\right]=\left[\begin{array}{c}\mathrm{\&Sigma;}{\mathrm{\&Delta;y}}_1\left(i\right)\\ \mathrm{\&Sigma;}{\mathrm{\&Delta;x}}_1\left(i\right){\mathrm{\&Delta;y}}_1\left(i\right)\end{array}\right]$

Described arithmetic unit comprises the second computing module, for according to described first parameter value second parameter value and experiment coal calorific value calculation goes out the 3rd parameter value 4th parameter value and the 5th parameter value it will be understood by those skilled in the art that described experiment coal calorific value is chemically examined by laboratory to obtain; Described second computing module calculates the 3rd parameter value, the 4th parameter value and the 5th parameter value according to following 3rd operational model;

Described 3rd operational model is:

$\left[\begin{array}{ccc}m& \mathrm{\&Sigma;}{b}_{0,i}^1& \mathrm{\&Sigma;}{b}_{1,i}^1\\ \mathrm{\&Sigma;}{b}_{0,i}^1& \mathrm{\&Sigma;}{\left(b_{0,i}^1\right)}^2& \mathrm{\&Sigma;}{b}_{0,i}^1{b}_{1,i}^1\\ \mathrm{\&Sigma;}{b}_{1,i}^1& \mathrm{\&Sigma;}{b}_{0,i}^1{b}_{1,i}^1& \mathrm{\&Sigma;}{\left(b_{1,i}^1\right)}^2\end{array}\right]\left[\begin{array}{c}{c}_0^1\\ c_1^1\\ c_2^1\end{array}\right]=\left[\begin{array}{c}\mathrm{\&Sigma;}{\tilde{Q}}_i\\ \mathrm{\&Sigma;}{\tilde{Q}}_i{b}_{0,i}^1\\ \mathrm{\&Sigma;}{\tilde{Q}}_i{b}_{1,i}^1\end{array}\right]$

Wherein m carries out returning the data group used number; When after laboratory chemical examination coal calorific value, also needing the calorific value data with chemically examining again to calculate according to the method described above, being used for correction the 3rd parameter value 4th parameter value with the 5th parameter value

Described arithmetic unit also comprises coal calorific value computing module, for according to the first parameter value second parameter value 3rd parameter value 4th parameter value with the 5th parameter value calculate coal calorific value Q1 (k) in k moment; Described coal calorific value computing module calculates coal calorific value Q1 (k) in described k moment according to following 4th operational model.

Described four-model is:

$Q_1\left(k\right)=c_0^1+c_1^1{b}_0^1\left(k\right)+c_2^1{b}_1^1\left(k\right)$

Described kiln hood current coal calorific value arithmetic element has same structure with described kiln tail current coal calorific value arithmetic element, thus obtains current coal calorific value Q2 (k) of kiln hood, no longer carries out tired stating here.

It will be understood by those skilled in the art that kiln tail current coal calorific value arithmetic element and kiln hood current coal calorific value arithmetic element all adopt following classical one order inertia Time Delay to portray, namely

$G\left(s\right)=\frac{K}{\mathrm{Ts}+1}{e}^{-\mathrm{\&tau;s}},$

Wherein K is model gain, and T is time constant, and τ is time lag.

According to current coal calorific value Q (k) and standard calorific value Q ₀relation to convert out corresponding model gain, that is,

$K=K_0\frac{Q}{Q_0}$

Wherein, K ₀standard calorific value Q is adopted when being debugging ₀identification model gain out.This relational expression had both been applicable to current coal calorific value arithmetic element and had also been applicable to kiln hood current coal calorific value arithmetic element.

Last it is noted that above embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.

Claims (6)

1. a coal pit temperature control system, comprises and feeds coal amount control device and reference locus input unit, can control to feed coal amount thus the temperature controlling coal pit according to reference locus; It is characterized in that: also comprise arithmetic unit, calorific value checkout gear, feed coal amount detecting device and calorific value estimation unit; Described calorific value checkout gear is all connected with described arithmetic unit with hello coal amount detecting device; Described calorific value estimation unit is connected with described coal amount control device of feeding.

2. coal pit temperature control system as claimed in claim 1, is characterized in that: described arithmetic unit comprises deviation computing module, for the standard coal calorific value Q calculating current coal calorific value Q (k) and arrange ₀between absolute difference, thus obtain coal calorific value straggling parameter value.

3. coal pit temperature control system as claimed in claim 1, it is characterized in that: described arithmetic unit comprises current coal calorific value computing module, comprising the kiln tail current coal calorific value arithmetic element for calculating current coal calorific value Q1 (k) of kiln tail and the kiln hood current coal calorific value arithmetic element for calculating current coal calorific value Q2 (k) of kiln hood.

4. coal pit temperature control system as claimed in claim 3, is characterized in that: described kiln tail current coal calorific value arithmetic element comprises: the first computing module, calculates for the detected value exported according to described calorific value checkout gear, hello coal amount detecting device.

5. coal pit temperature control system as claimed in claim 4, is characterized in that: described arithmetic unit comprises the second computing module, for calculating according to the result of calculation of described first computing module and experiment coal calorific value.

6. coal pit temperature control system as claimed in claim 5, is characterized in that: described arithmetic unit also comprises coal calorific value computing module, for calculating coal calorific value Q1 (k) in k moment.