CN106362648A - Heat accumulating type quick pyrolysis furnace temperature control method capable of controlling air-fuel ratio - Google Patents
Heat accumulating type quick pyrolysis furnace temperature control method capable of controlling air-fuel ratio Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 58
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- 230000001172 regenerating effect Effects 0.000 claims description 7
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- 239000002737 fuel gas Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 20
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J6/00—Heat treatments such as Calcining; Fusing ; Pyrolysis
- B01J6/008—Pyrolysis reactions
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B47/00—Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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- G—PHYSICS
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- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/1902—Control of temperature characterised by the use of electric means characterised by the use of a variable reference value
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
- B01J2219/00049—Controlling or regulating processes
- B01J2219/00051—Controlling the temperature
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Abstract
The invention provides a heat accumulating type quick pyrolysis furnace temperature control method capable of controlling the air-fuel ratio. The method comprises the steps that N layers of radiant tubes are selected as a temperature control area, wherein the expected temperature is T[q], and the expected air-fuel ratio is K[q]; the unit control time interval is set as t[n]; the actual air flow of the temperature control area is measured as Q[k]; the actual fuel gas flow of the temperature control area is measured as Q[r]; the actual air-fuel ratio K is calculated through the measured Q[k] and Q[r]; the temperature T of a pyrolysis furnace zone of the temperature control area is measured; T[q] and T are introduced into a first PID controller, and a p1 value is calculated; the switched-on degree of an air regulating valve is controlled through p1; K[q] and K are introduced into a second PID controller, and a p2 value is calculated; the switched-on degree of a fuel gas regulating valve is controlled through p2; the above-mentioned process is repeated, and then control over the actual air-fuel ratio is achieved. According to the method which takes air-fuel ratio control as a main control purpose and takes dynamic temperature control over the radiant tube on-off time as an auxiliary control purpose, a uniform temperature field can be achieved.
Description
Technical Field
The invention relates to the field of fast pyrolysis chemical industry, in particular to the field of automatic control of furnace temperature of a heat accumulating type fast pyrolysis furnace, and particularly relates to a method for controlling the temperature of the heat accumulating type fast pyrolysis furnace by controlling an air-fuel ratio.
Background
The fast pyrolysis can lead the carbon-containing polymer to generate bond breaking reaction rapidly, inhibit secondary pyrolysis reaction and crosslinking reaction of pyrolysis products, reduce fuel gas and semicoke products in the pyrolysis process and improve the yield of tar. The heat accumulating type fast pyrolysis furnace adopts a heat accumulating type radiant tube as a heating source to realize fast pyrolysis of carbon-containing organic matters. The pyrolysis zone of the heat accumulating type fast pyrolysis furnace consists of a plurality of layers of heat accumulating type radiant tubes which are distributed at intervals in the height direction of the furnace body, and a plurality of radiant tubes are distributed at intervals in the horizontal direction. Depending on the requirements of the different processes, it may be necessary to form one or more uniform temperature fields. For the formation of uniform temperature fields, the general method is to adjust the temperature in the furnace by manually adjusting the opening of the subarea gas regulating valve, limit the temperature of a single radiant tube, and prevent the radiant tube from being too low or too high, burning out the radiant tube and causing the non-uniform temperature field in the furnace. In the actual operation process, the requirement of one or more uniform temperature fields for reaching the accurate expected temperature in the furnace is difficult to realize, the relative uniform temperature fields are realized only in a relatively large temperature range, and the phenomenon that the temperature of a single radiant tube is seriously overhigh also happens occasionally. Therefore, the actual furnace temperature control cannot well meet the process requirements, and the service life of the radiant tube is seriously influenced by the long-term overhigh temperature. Therefore, the temperature control method of the existing regenerative fast pyrolysis furnace needs to be further improved.
At present, a multi-layer radiant tube zone heating and control method is applied, but the method needs more temperature controllers and silicon controlled power regulators in each zone of each layer, and the cost investment is increased. At present, a heating control method for a radiant tube of a continuous annealing furnace is also provided, wherein a target temperature of each strip steel and a yield percentage of each strip steel are obtained from historical data; calculating the corresponding relation between each type of strip steel target temperature and each type of strip steel yield percentage to obtain a radiant tube temperature setting value group corresponding to each type of strip steel target temperature, wherein one radiant tube temperature setting value group comprises the temperature of each radiant tube in the continuous annealing furnace; generating a secondary heating model curve corresponding to each band steel target temperature based on the radiant tube temperature setting value groups, wherein one radiant tube temperature setting value group generates one secondary heating model curve; and calling one secondary heating model curve matched with the current target temperature of the strip steel and the current yield percentage of the strip steel from the secondary heating model curves to control the radiant tube in each area, so as to carry out heat treatment on the strip steel in the continuous annealing furnace. The temperature control scheme of the method is relatively specific and inflexible, and needs considerable calculation and is complex to implement.
Because the prior art has many defects, how to improve the method for heating and controlling the multi-layer radiant tube in a subarea manner, improve the flexibility of control and reduce the cost becomes a problem to be solved urgently.
Disclosure of Invention
In order to solve the defects of the prior art that the prior art is not flexible enough, the realization is complex and the implementation cost is high, the invention aims to provide a temperature control method of a heat accumulating type fast pyrolysis furnace for controlling the air-fuel ratio, which can realize a uniform temperature field more flexibly, more simply and at low cost and better adapt to the requirements of the process.
The invention provides a temperature control method of a heat accumulating type rapid pyrolysis furnace for controlling air-fuel ratio, which comprises the following steps:
selecting N layers of radiant tubes in the fast pyrolysis furnace as a temperature control area, wherein the expected temperature of the fast pyrolysis furnace section corresponding to the temperature control area is Tq, and the expected air-fuel ratio Kq of the fast pyrolysis furnace section corresponding to the temperature control area is Kq;
setting a unit control time interval for the temperature control region to tn；
Measuring the actual air flow rate of the temperature control zone as Qk；
Measuring the actual gas flow in the temperature control area as Qr；
By measured Qk、QrCalculating an actual air-fuel ratio K in the temperature control region;
measuring the temperature T of the section of the fast pyrolysis furnace corresponding to the temperature control area;
introducing Tq and T into a first PID controller to ensure that the first PID controller calculates in real time, and recording the output value as p 1;
introducing p1 into said temperature control zone air adjustment valve controller to control the opening of said temperature control zone air adjustment valve;
introducing Kq and K into the second PID controller to ensure that the second PID controller calculates in real time, and recording the output value as p 2;
introducing p2 into said temperature control zone gas regulator valve controller to control the opening of said temperature control zone gas regulator valve;
and repeating the process, and controlling the temperature of the rapid pyrolysis furnace by controlling the actual air-fuel ratio.
Further, the method comprises the following steps:
measuring the temperature T (m) of each radiant tube in the temperature control zone, wherein m is a positive integer less than or equal to the total number of radiant tubes in the temperature control zone;
calculating an average value T of the temperatures of all the radiant tubes in the temperature control zoneavg；
Mixing T (m) and TavgIntroducing the third PID controller to ensure that the third PID controller calculates and outputs the t (m) value of each radiant tube in the temperature control area in real time, wherein the t (m) value is a unit control time interval and is tnThe turn-off time of the mth radiant tube in the temperature control area is greater than zero and is less than or equal to the integer of the total number of the radiant tubes in the temperature control area;
t (m) value of each radiant tube in the temperature control zone in unit control time intervalnThe corresponding radiant tube is internally shut off.
Further, more than two temperature control areas are arranged in the fast pyrolysis furnace.
Further, the proportional, integral and differential parameters of the first PID controller and the second PID controller are obtained through a trial and error method.
Further, the proportional, integral and differential parameters of the third PID controller are obtained by trial and error.
Further, the maximum value of the output range of the first PID controller is tn1Defining the output range of the first PID controller as tL1～tH1Wherein t isL1When the temperature control area is in the minimum load state, the minimum opening degree of an air adjusting valve is set; t is tH1And when the temperature control area is in the maximum load, the maximum opening of the air adjusting valve is realized.
Further, the maximum value of the output range of the second PID controller is tn2Defining the output range of the second PID controller as tL2～tH2Wherein t isL2When the temperature control area is in the minimum load, the minimum opening degree of a gas regulating valve is set; t is tH2And when the temperature control area is in the maximum load, the maximum opening degree of the gas regulating valve is adjusted.
Further, the maximum value of the output range of the third PID controller is tnLimiting the output range of the third PID controller to 0-tn。
Furthermore, a reversible radiant tube is used as the radiant tube, the reversing period of the reversible radiant tube is 50-200 seconds, and the unit control time interval comprises 8-16 reversing periods.
Further, the time for switching off the reversible radiant tube is integral multiple of the commutation period.
The invention can realize the following beneficial effects: the method of using the air-fuel ratio as the main control and using the temperature control of dynamically controlling the on-off time of the radiant tube as the auxiliary control is easy to improve the uniformity of the temperatures of different radiant tubes in corresponding temperature fields, avoids the influence of the overhigh temperature of a single radiant tube on the service life of the radiant tube, is further favorable for realizing uniform temperature fields, and better meets the requirements of the process.
Drawings
FIG. 1 is a flow chart of a method for controlling the temperature of a zone 1 temperature field according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, first, the name of the regenerative radiant tube is defined asCorresponding to an actual temperature of the radiant tube ofWherein x is 1,2,3 …, m; y isx1,2,3 …, n. x is the number of layers of the radiant tubes from top to bottom in the height direction of the furnace body of the rapid pyrolysis furnace, and y isxIs the number of x layers of radiant tubes (x and y are both referred to herein below). For a specific furnace, corresponding to a known x, there is a specific y value, i.e. all radiant tubes have a specific name. For example,is a 2 nd layer, a 3 rd radiant tube, T3 2The temperature of the 2 nd layer and the 3 rd radiant tube is from top to bottom.
The furnace temperature control scheme is illustrated by taking 3 uniform temperature fields as an example, and one or more uniform temperature field temperature control schemes are similar, and the method is not limited to 3 temperature fields. The number of the distributed layers of the radiant tubes and the number of the radiant tubes per layer are fixed for a certain fast pyrolysis furnace, and the method is not limited to the number of the layers and the number of the radiant tubes per layer which are set as follows. X is 12, and the number y of the radiant tubes in each layer is arranged from top to bottom1＝8，y2＝6，y3＝8，y4＝6，y5＝8，y6＝6，y7＝8，y8＝6，y9＝8，y10＝6，y11＝8，y12＝6。
Let the radiant tube with x equal to 1,2,3,4 form a 1-zone temperature field, the radiant tube with x equal to 5,6,7,8 form a 2-zone temperature field, the radiant tube with x equal to 9,10,11,12 form a 3-zone temperature field, the actual temperature corresponding to the three zones is T1，T2，T3(ii) a The desired temperatures of the three zones are Tq1，Tq2，Tq3(ii) a The actual air flow rates of the three zones are respectively Qk1、Qk2、Qk3(ii) a The actual gas flow of the three zones is Qr1、Qr2、Qr3(ii) a The actual air-fuel ratios of the three zones are respectively K1、K2、K3(ii) a The desired air-fuel ratios of the three regions are Kq1、Kq2、Kq3(ii) a t is the commutation period of the radiant tube.
A single radiant tubeTime period t of n successive commutation periods tnAs the unit control time for executing the temperature control method once, each reversing period can be 50-200 seconds, so that the temperature measurement sampling time of the radiant tube in a certain reversing period is not the time when the radiant tube is to be reversed or just reversed. Each zone has a gas regulating valve and an air regulating valve respectively, and the gas and air main pipelines of the zone are arranged. The air and fuel supply of the whole area can be changed by adjusting the fuel gas regulating valve and the air regulating valve so as to change the load of the area and form different temperature fields.
The method is illustrated by taking the temperature control of the zone 1 temperature field as an example. Radiant tube of zone 1 Temperature value ofStoring in a fixed order into a one-dimensional array P [28 ]]In (1). Arranging the numerical values of the elements in the array from small to large, and storing the numerical values in a new array Q [28 ]]In (1).
Setting PID controllers a, b and PID controllerThe output values are ta ', tb' andlet tn1、tn2And tn3Wherein t isn1Is the maximum value of the output range of the PID controller a, tn2Is the maximum value of the output range of the PID controller b, tn3Is a radiant tubeTemperature ofPID controller when approaching 1 zone radiant tube average temperatureThe maximum value of the output range. Limiting the output range of the PID controller a to tL1～tH1Limiting the output range of the PID controller b to tL2～tH2Defining PID controllerHas an output range of 0 to tn3. Wherein t isL1When the area 1 requires the minimum load according to the process, the minimum opening degree of an air adjusting valve is adjusted; t is tH1When the minimum load is required according to the process in the area 1, the maximum opening degree of an air adjusting valve is adjusted; t is tL2When the minimum load is required according to the process in the area 1, the minimum opening degree of a gas regulating valve is adjusted; t is tH2The maximum opening degree of the gas regulating valve is 1 when the minimum load is required according to the process.
The mixture Tq1And T1And a PID controller a is introduced, and appropriate parameters such as proportion, integration and differentiation are set. Ensuring that the PID controller a calculates and outputs a ta' value in real time. Every t seconds, take the ta' value, and round it, store the result in ta. Ta is introduced into the zone 1 air adjustment valve controller to control the opening of the zone 1 air adjustment valve.
Kq is treated1And K1And a PID controller b is introduced, and appropriate parameters such as proportion, integration and differentiation are set. Ensuring that the PID controller b calculates and outputs the value of tb' in real time. Every t seconds, the value of tb' is taken and rounded, and the result is stored in tb. Tb is introduced into the controller of the gas regulating valve of the zone 1 to control the opening degree of the gas regulating valve of the zone 1.
A single radiant tubeTime period t of n successive commutation periods tnAs a PID controllerAnd (3) controlling the temperature of the single radiant tube in the zone 1 to be close to the unit control time of the average temperature control method. The continuous turn-off time of a single radiant tube in unit control time is set asWherein the value of n is set according to the actual process condition;is an integer multiple of t.
Let the average temperature of the zone 1 radiant tubes be Tavg1. For the 1-zone single radiant tube, theAnd Tavg1Introducing a PID controllerAnd setting appropriate parameters such as proportion, integration and differentiation. Ensuring PID controllersReal-time calculation and outputThe value is obtained. Every tnOne time per secondDividing the value by t, rounding, multiplying by t, and storing the resultIn (1).
For a 1-zone radiant tubeAre all determinedEvery tnSecond, turn off the radiant tube controllerThe radiant tube is closed and opened in each unit control time aiming at each radiant tube, so that the aim of temperature control for dynamically controlling the on-off time of the radiant tube is fulfilled.
Note that: the value-taking time is required to avoid the time when the radiant tube is about to be reversed and just reversed, for example, the value-taking time can be set at the 20 second time after the radiant tube finishes the last reversing action; the time can also be adjusted according to the process requirements, for example, the time can be from 20 seconds after the last reversing action of the previous unit control time interval to the next timeAt a certain time in the time period between 20 seconds before the reversing action, the temperature measurement value of the radiant tube is taken to avoid takingThe normal reversing action of the radiant tube is disturbed by the process of controlling the on-off of the radiant tube by the value.
Example 1
According to the method, the method is specifically described in combination with a laboratory fast pyrolysis furnace. The laboratory fast pyrolysis furnace was controlled by PLC and WinCC of Siemens CPU414-2 DP. Therefore, in consideration of the actual situation, the complexity of PLC (programmable logic controller) or WinCC (WinCC) programming and real-time operation of the method and the influence of the method on the independent, normal and stable operation of the original control system are reduced as much as possible, and LabView software is used for exchanging data through OPC (optical proximity correction) service and PLC (programmable logic controller).
The laboratory fast pyrolysis furnace has 24 layers from top to bottom and is divided into 4 zones, namely, 1 zone for every 6 layers. Each layer has an air regulating valve and a gas regulating valve. The first layer has 3 radiant tubes, and the number of radiant tubes in each layer is 3 or 2 and is arranged alternately. Thus, one zone has 15 radiant tubes. The temperature field control in zone 2 is described, and the control method is the same for the other zones.
First, a variable defining a Boolean type for turning off a corresponding radiant tube isWherein x is 1,2,3 …, m; y isx1,2,3 …, n. x is the number of layers of the radiant tubes from top to bottom in the height direction of the furnace body of the rapid pyrolysis furnace, and y isxThe number of the x layers of radiant tubes. A data block DB101 is newly created in the PLC program, and 15 BOOL type variables are created in the data block And respectively connecting a normally open contact in series at the 15 radiation tube turn-off positions of the 2-zone radiation tube turn-off control subprogram in the PLC ladder diagram control program, wherein the normally open contact corresponds to the 15 BOOL type variables in the data block DB 101.
Establishing a device corresponding actual PLC in NI OPC Servers of LabView, and establishing 2 areas of 15 radiant tubes corresponding turn-off variables under the deviceEstablishing FLOAT type temperature variable of 15 radiant tubes in 2 areasCorresponding to the radiant tube temperature value of the 2 area in the PLC program DB block; establishing FLOAT type furnace temperature variable t of 15 radiant tubes in 2 areas2And t'2Wherein, T2＝(t2+t’2) 2; establishing BOOL type variable marked by 15 radiation tubes in 2 regionsA control output mark of a side gas cutting valve of a radiant tube A and a control output mark of a side gas cutting valve of a B corresponding to the area 2 in the PLC program DB block; establishing INT type variables of the 2-region air regulating valve, and corresponding to PQW570 in a PLC program (PQW570 refers to AO addresses of the air regulating valve correspondingly controlled by an actual PLC analog quantity output module); and establishing INT type variables of the 2-region gas regulating valves, and corresponding to PQW578 in the PLC program (PQW578 is the AO address of the actual PLC analog quantity output module corresponding to the control gas regulating valve). x is the number of layers of the radiant tubes from top to bottom in the height direction of the furnace body of the rapid pyrolysis furnace, and y isxThe number of the x layers of radiant tubes. Where x is 7,8,9,10,11,12, and when x is 7,9,11, y isxWhen x is 8,10,12, y is 3x＝2。
According toProcess of making a single radiant tube10 continuous (can also be adjusted according to the process requirements, for example, 8-16 reversing cycles can be adopted, the reversing is not particularly frequent for 8 reversing cycles, the running stability of the radiant tube is ensured, the reversing time is not particularly long for 16 reversing cycles, and the quick effectiveness of the temperature control is ensured.) time period t of the reversing cycle t10Unit control time regarded as one time execution of the temperature control method, where t10＝10t。
The mixture Tq2And T2And a PID controller a is introduced, and appropriate parameters such as proportion, integration and differentiation are set. Ensuring that the PID controller a calculates and outputs a ta' value in real time. And taking a value ta' once every t seconds, rounding the value, storing the result in the value ta, introducing the value ta into the 2-area air regulating valve controller, and converting the value ta into a value corresponding to the PLC actual address PQW570 and the opening of the 2-area air regulating valve.
Kq is treated2And K2And a PID controller b is introduced, and appropriate parameters such as proportion, integration and differentiation are set. Ensuring that the PID controller b calculates and outputs the value of tb' in real time. And taking a tb' value every t seconds, rounding the value, storing the result into the tb, introducing the tb into the 2-area gas regulating valve controller, and converting the tb into a value corresponding to the PLC actual address PQW578, namely the opening of the 2-area gas regulating valve.
Let the average temperature of the 2-zone radiant tube be Tavg2. Radiant tubes for zone 2 determination, e.g.To explain, handleAnd Tavg2Introducing a PID controllerAnd setting appropriate parameters such as proportion, integration and differentiation.Ensuring PID controllersReal-time calculation and outputThe value is obtained. Every t10One time per secondDividing the value by t, rounding, multiplying by t, and storing the resultIn, e.g.4 t. Wherein,
for 2-zone radiant tubeWith certaintyEvery t10Second, turn off the radiant tube controllerI.e. 4t of time to the radiant tubeAt each unit control time t10The radiant tube is internally closed and opened so as to achieve the temperature control purpose of dynamically controlling the on-off time of the radiant tube. For other radiant tube control methods of the 2 regions, reference radiant tube can be madeThe control of (1).
Radiant tubeThe turn-off is required according toAnd the current value determines the commutation state of the radiant tube, so that the normal commutation action of the radiant tube is prevented from being disturbed. Only whenAndone of the variables is True and the action of turning off the radiant tube is performed at a time when the state is maintained for 20 seconds (adjustable according to the process). Radiation supply pipeVariable of (2)And if the radiation tube is assigned as fast, the corresponding radiation tube can be switched off.
It should be noted that the above-mentioned embodiments described with reference to the drawings are only intended to illustrate the present invention and not to limit the scope of the present invention, and it should be understood by those skilled in the art that modifications and equivalent substitutions can be made without departing from the spirit and scope of the present invention. Additionally, all or a portion of any embodiment may be utilized with all or a portion of any other embodiment, unless stated otherwise.
Claims (10)
1. A temperature control method of a regenerative fast pyrolysis furnace for controlling air-fuel ratio comprises the following steps:
selecting N layers of radiant tubes in the fast pyrolysis furnace as a temperature control area, wherein the expected temperature of the fast pyrolysis furnace section corresponding to the temperature control area is Tq, and the expected air-fuel ratio Kq of the fast pyrolysis furnace section corresponding to the temperature control area is Kq;
setting a unit control time interval for the temperature control region to tn；
Measuring the actual air flow in the temperature controlled zoneAmount is Qk；
Measuring the actual gas flow in the temperature control area as Qr；
By measured Qk、QrCalculating an actual air-fuel ratio K in the temperature control region;
measuring the temperature T of the section of the fast pyrolysis furnace corresponding to the temperature control area;
introducing Tq and T into a first PID controller to ensure that the first PID controller calculates in real time, and recording the output value as p 1;
introducing p1 into said temperature control zone air adjustment valve controller to control the opening of said temperature control zone air adjustment valve;
introducing Kq and K into the second PID controller to ensure that the second PID controller calculates in real time, and recording the output value as p 2;
introducing p2 into said temperature control zone gas regulator valve controller to control the opening of said temperature control zone gas regulator valve;
and repeating the process, and controlling the temperature of the rapid pyrolysis furnace by controlling the actual air-fuel ratio.
2. The method of controlling the temperature of a regenerative fast pyrolysis furnace according to claim 1, comprising the steps of:
measuring the temperature T (m) of each radiant tube in the temperature control zone, wherein m is a positive integer less than or equal to the total number of radiant tubes in the temperature control zone;
calculating an average value T of the temperatures of all the radiant tubes in the temperature control zoneavg；
Mixing T (m) and TavgIntroducing the third PID controller to ensure that the third PID controller calculates and outputs the t (m) value of each radiant tube in the temperature control area in real time, wherein the t (m) value is a unit control time interval and is tnThe turn-off time of the mth radiant tube in the temperature control area is greater than zero and is less than or equal to the integer of the total number of the radiant tubes in the temperature control area;
according to the t (m) value of each radiant tube in the temperature control areaAt unit control time interval tnThe corresponding radiant tube is internally shut off.
3. The method of controlling a temperature of a regenerative fast pyrolysis furnace according to claim 1 or 2, wherein two or more temperature control zones are provided in the fast pyrolysis furnace.
4. The method of claim 1, wherein the proportional, integral and differential parameters of the first PID controller and the second PID controller are obtained by trial and error.
5. The method of claim 2, wherein the proportional, integral and differential parameters of the third PID controller are obtained by trial and error.
6. The method of controlling a temperature of a regenerative fast pyrolysis furnace according to claim 1 or 2, wherein the maximum value of the output range of the first PID controller is tn1Defining the output range of the first PID controller as tL1～tH1Wherein t isL1When the temperature control area is in the minimum load state, the minimum opening degree of an air adjusting valve is set; t is tH1And when the temperature control area is in the maximum load, the maximum opening of the air adjusting valve is realized.
7. The method of controlling a temperature of a regenerative fast pyrolysis furnace according to claim 1 or 2, wherein the maximum value of the output range of the second PID controller is tn2Defining the output range of the second PID controller as tL2～tH2Wherein t isL2When the temperature control area is in the minimum load, the minimum opening degree of a gas regulating valve is set; t is tH2At the time of the maximum load of the temperature control zone,the maximum opening degree of the gas regulating valve.
8. The method of claim 2, wherein the maximum value of the output range of the third PID controller is tnLimiting the output range of the third PID controller to 0-tn。
9. The method of claim 2, wherein a reversible radiant tube is used as the radiant tube, the reversing period of the reversible radiant tube is 50-200 seconds, and the unit control time interval includes 8-16 reversing periods.
10. The method of claim 9, wherein the time required to turn off the switchable radiant tube is an integer multiple of the switching period.
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| CN109491421A (en) * | 2018-11-22 | 2019-03-19 | 重庆百尺竿头科技有限公司 | The intelligent temperature control system and its method recycled based on metallurgical secondary resource |
| CN110895420A (en) * | 2019-12-31 | 2020-03-20 | 湖南顶立科技有限公司 | Temperature control method and device for pyrolysis verification system |
| CN112695192A (en) * | 2020-12-17 | 2021-04-23 | 中冶南方工程技术有限公司 | Furnace temperature hybrid control method of distributed reversing regenerative heating furnace |
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