WO2021077530A1 - Method and device for controlling hot air fan of separation column - Google Patents

Abstract

A method for controlling a hot air fan of a separation column, for controlling the rotation speed of the hot air fan of the separation column. The control method comprises the following steps: when a separation column is in normal operation, acquiring the current production heat transfer coefficient for a heating stage of the separation column; acquiring a target end control temperature for the heating stage of the separation column; and obtaining, on the basis of the production heat transfer coefficient and the target end control temperature, the rotation speed of a hot air fan.

Description

Method and device for controlling hot air fan of analytical tower

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office on October 25, 2019, the application number is 201911026229.1, and the invention title is "Analysis Tower Hot Air Fan Control Method and Device", the entire content of which is incorporated herein by reference. Applying.

Technical field

This application relates to the technical field of sintering flue gas purification, and in particular to a method for controlling a hot air fan of an analytical tower. In addition, this application also relates to a hot air fan control device for the analytical tower.

Background technique

The amount of flue gas generated in the sintering process accounts for about 70% of the entire steel process. The main pollutants in the sintering flue gas are dust, SO2, and NOX; there are also a small amount of VOCs, dioxins, heavy metals, etc.; purification is required It can only be discharged after processing. At present, the technology of the activated carbon desulfurization and denitrification device for processing sintering flue gas has been mature, and it has been promoted and used in China and has achieved good results.

Referring to Figure 1, Figure 2, Figure 3 and Figure 4, Figure 1 is a schematic structural diagram of a sintering flue gas purification device in the prior art; Figure 2 is a structural schematic diagram of the analysis tower of the sintering flue gas purification device in Figure 1; 3 is a schematic diagram of the structure of the heating section of the analytical tower in FIG. 2; FIG. 4 is a schematic cross-sectional view of the heating section in FIG. 3.

As shown in Figure 1, the prior art sintering flue gas purification device includes an adsorption tower 2, a first activated carbon conveyor S1, an activated carbon storage bin 3, a belt scale C1, an analysis tower 1, a vibrating screen 4, and a second activated carbon conveyor机S2 and other components. Among them, the analysis tower 1 includes components such as buffer bin 106, analysis tower feed valve 107, and analysis tower feeder G1. The adsorption tower 2 includes components such as an adsorption tower feed valve 201 and an adsorption tower feeder G2.

As shown in Figure 1, during operation, the original flue gas (the main pollutant is SO2) generated in the sintering process passes through the 2-body activated carbon bed of the adsorption tower and becomes the net flue gas to be discharged outside. The activated carbon that has adsorbed the pollutants in the flue gas (the main component of the pollutant is SO2) is sent to the desorption tower 1 through the first activated carbon conveyor S1, and the activated carbon that has adsorbed the pollutants in the desorption tower 1 is heated to 400°C to 430°C for analysis Activated, analyze the SRG (sulfur-rich) gas released after activation to remove the acid production process, analyze the activated activated carbon and cool it to 110℃～130℃, then discharge it out of the analysis tower 1, vibrating screen 4 sieving out the activated carbon dust, and sieve the activated carbon particles The second activated carbon conveyor S2 enters the adsorption tower 2 again, thereby realizing the circulating flow of activated carbon. Activated carbon will be lost in the circulating flow, so the activated carbon storage bin 3 is measured by the belt scale C1 to supplement the activated carbon.

As shown in Figure 2, the desorption tower 1 includes a buffer silo 106, a desorption tower feed valve 107, a feed section 101, a heating section 102, a heat preservation section 103, a retention section 108, a cooling section 104, a discharge section 105, and a desorption tower feed Feeder G1, hot air system, cooling air system, nitrogen system and SRG gas system and other components.

As shown in FIG. 3, a hot air baffle 1021 is provided inside the heating section 102. The hot blast system includes a hot blast stove L1 and a hot blast fan F1. The hot blast stove L1 heats the air. The hot blast fan F1 makes the heated air circulate quickly, so that the hot blast enters from the air inlet and flows out from the hot blast outlet.

As shown in Figure 4, the activated carbon flows downward in the steel pipe of the heating section 102, the hot air passes through the heating section 102, and the activated carbon flowing in the heating steel pipe is heated. The activated carbon and the hot air are airtightly isolated; the activated carbon is at the beginning of the heating section 102. The temperature is in the range of 80°C to 150°C, generally around 100°C; at the end of the heating section 102, the temperature reaches above 400°C to meet the requirements of activated carbon analysis. However, in the current prior art, the rotation speed of the hot air blower F1 cannot be accurately controlled. When working, it is generally upgraded to the maximum speed, so that the end temperature of the heating section 102 is between 400°C and 440°C. Therefore, the hot air blower F1 rotates too high, the rotating speed is too high, and the hot air stove L1 inputs too much heat, which wastes electric energy and fuel.

Summary of the invention

The technical problem to be solved in this application is to provide a method for controlling the hot air blower of the analytical tower, which can accurately control the speed of the hot air blower according to the target temperature at the end of the heating section, thereby effectively avoiding excessive heat input from the hot blast stove and causing waste The problem of electricity and fuel.

In order to solve the above technical problems, the first aspect of the present application provides a method for controlling the hot air blower of the analytical tower, which is used to control the speed of the hot air blower of the analytical tower. The hot air blower control method includes the following steps:

When the analysis tower is working normally, obtain the production heat exchange coefficient of the heating section of the current analysis tower;

Obtaining the end-point target control temperature of the heating section of the analytical tower;

The fan speed of the hot air fan is obtained based on the production heat exchange coefficient and the end-point target control temperature.

Optionally, the hot air fan control method includes the following steps:

The hot air fan has a predetermined working period of time for the fan rotation speed obtained in the previous step;

Detecting the actual end-point temperature of the heating section;

When the actual temperature at the end point does not meet the predetermined threshold range, the following steps are cyclically executed:

Obtaining the production heat exchange coefficient of the heating section of the current analysis tower;

Based on the production heat exchange coefficient and the end-point target control temperature, the fan speed of the hot air fan at this time is obtained again;

The hot air blower operates for a predetermined period of time at the blower speed obtained again;

The actual temperature at the end of the heating section is detected.

Optional,

The step of obtaining the production heat exchange coefficient of the heating section of the current analysis tower includes:

Acquiring the hot air inlet temperature of the heating section of the analysis tower and the hot air outlet temperature of the heating section;

Acquiring the starting temperature of the heating section and the ending temperature of the heating section;

Acquiring the current fan speed of the hot air blower and the current feeder speed of the feeder of the analysis tower;

Based on the hot air inlet temperature, the hot air outlet temperature, the starting temperature, the ending temperature, the current fan speed, and the current feeder speed, the production heat exchange of the heating section of the analysis tower is obtained coefficient.

Optional,

The production of the heating section of the analysis tower is obtained based on the hot air inlet temperature, the hot air outlet temperature, the starting temperature, the ending temperature, the current fan speed, and the current feeder speed The steps of heat exchange coefficient include:

Based on the following logical relationship, the production heat exchange coefficient is obtained:

Wherein, K _J represents the production heat exchange coefficient, T _TF1 represents the hot air inlet temperature; T _TF2 represents the hot air outlet temperature; T _1TE represents the starting temperature; T _2TE represents the end temperature; F _F1 represents the temperature The current fan speed; F _G1 represents the current feeder speed.

Optional,

The step of obtaining the fan speed of the hot air fan based on the production heat exchange coefficient and the end-point target control temperature includes:

Acquiring the hot air inlet temperature of the heating section of the analysis tower and the hot air outlet temperature of the heating section;

Acquiring the starting temperature of the heating section and the end target control temperature of the heating section;

Acquiring the current feeder speed of the feeder of the analysis tower;

Based on the production heat exchange coefficient, the hot air inlet temperature, the hot air outlet temperature, the starting point temperature, the end target control temperature, and the current feeder speed, the fan speed of the hot air blower is obtained.

Optional,

Said based on said production heat exchange coefficient, said hot air inlet temperature, said hot air outlet temperature, said starting point temperature, said end target control temperature, and said current feeder speed to obtain the fan of said hot air blower The steps of speed include:

Based on the following logical relationship, the fan speed is obtained:

Wherein, F _f1 represents the fan speed; K _J represents the production heat exchange coefficient, T _TF1 represents the hot air inlet temperature; T _TF2 represents the hot air outlet temperature; T _1TE represents the starting temperature; TK represents the End point target control temperature; F _G1 represents the current feeder speed.

Optional,

The predetermined duration is obtained through the following steps:

Obtaining the flow rate of the activated carbon in the analysis tower;

Obtaining the length of the heating section;

The ratio of the length of the heating section to the flow rate of the activated carbon, and the ratio is multiplied by a predetermined multiple to obtain the predetermined duration.

Optional,

The starting temperature is obtained by the following steps:

Acquiring the temperature at each predetermined temperature measurement point in the starting point plane of the heating section;

The starting temperature is obtained based on the arithmetic mean of the temperature at each temperature measurement point.

Optional,

The endpoint temperature is obtained through the following steps:

Acquiring the temperature at each predetermined temperature measurement point in the terminal plane of the heating section;

The terminal temperature is obtained based on the arithmetic mean of the temperature at each temperature measurement point.

In addition, in order to solve the above-mentioned technical problems, the second aspect of the present application also provides a hot air fan control device for the analysis tower, which is used to control the rotation speed of the hot air fan of the analysis tower, including the analysis tower, and the analysis tower includes:

The heating section is used to heat the activated carbon flowing through the analysis tower;

The hot air blower is used to blow hot air into the heating section of the analysis tower;

A feeder for controlling the discharge flow rate of the activated carbon in the analysis tower;

The analysis tower includes:

The first temperature measuring element is used to obtain the hot air inlet temperature of the heating section of the analysis tower;

The second temperature measuring element is used to obtain the hot air outlet temperature of the heating section;

The third temperature measuring element is used to obtain the starting temperature of the heating section;

The fourth temperature measuring element is used to obtain the end temperature of the heating section;

The first calculation unit is configured to be based on the hot air inlet temperature, the hot air outlet temperature, the starting point temperature, the ending temperature, the current fan speed of the hot air blower, and the current feeder speed of the feeder , Obtain the production heat exchange coefficient of the heating section of the analytical tower;

The second calculation unit is used to control the temperature based on the production heat exchange coefficient, the hot air inlet temperature, the hot air outlet temperature, the starting point temperature, the end point target control temperature of the heating section, and the current feeder speed, Obtain the fan speed of the hot air fan.

Optional,

The first calculation unit obtains the production heat exchange coefficient based on the following logical relationship:

Wherein, K _J represents the production heat exchange coefficient, T _TF1 represents the hot air inlet temperature; T _TF2 represents the hot air outlet temperature; T _1TE represents the starting temperature; T _2TE represents the end temperature; F _F1 represents the temperature The current fan speed; F _G1 represents the current feeder speed.

Optional,

The second calculation unit obtains the fan speed of the hot air fan based on the following logical relationship:

Wherein, F _f1 represents the fan speed; K _J represents the production heat exchange coefficient, T _TF1 represents the hot air inlet temperature; T _TF2 represents the hot air outlet temperature; T _1TE represents the starting temperature; TK represents the End point target control temperature; F _G1 represents the current feeder speed.

Optional,

There are multiple third temperature measuring elements, and they are evenly distributed in the starting plane of the heating section;

Each of the third temperature measuring elements is provided with a plurality of thermocouples for temperature measurement.

Optional,

A protective sleeve is provided on the outside of the third temperature measuring element.

Optional,

There are multiple fourth temperature measuring elements, and they are evenly distributed in the end plane of the heating section;

Each of the fourth temperature measuring elements is provided with a plurality of thermocouples for temperature measurement.

Optional,

A protective sleeve is provided outside the fourth temperature measuring element.

In this application, the hot air fan control method includes the following steps:

When the analysis tower is working normally, obtain the production heat exchange coefficient of the heating section of the current analysis tower;

Obtaining the end-point target control temperature of the heating section of the analytical tower;

The fan speed of the hot air fan is obtained based on the production heat exchange coefficient and the end-point target control temperature.

The method can accurately control the speed of the hot air blower according to the target temperature at the end of the heating section, so as to effectively avoid the hot air stove inputting too much heat, which causes the problem of wasting electric energy and fuel.

In addition, the technical effect of the hot air fan control device of the analytical tower provided by this application is the same as the technical effect of the above method, and will not be repeated here.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work.

Figure 1 is a schematic structural diagram of a sintering flue gas purification device in the prior art;

Fig. 2 is a schematic diagram of the structure of the analysis tower of the sintering flue gas purification device in Fig. 1;

Figure 3 is a schematic diagram of the structure of the heating section of the analytical tower in Figure 2;

4 is a schematic cross-sectional view of the heating section in FIG. 3;

FIG. 5 is a schematic structural diagram of an analysis tower shown in an exemplary embodiment of this application;

Fig. 6 is a schematic diagram of the distribution of temperature measuring elements of the analytical tower in Fig. 5;

Fig. 7 is a logic flow chart of a method for controlling a hot air blower of an analytical tower shown in an exemplary embodiment of the application.

Among them, the correspondence between component names and reference signs in Figures 1 to 6 is:

1 analysis tower; 101 feed section; 102 heating section; 1021 hot air baffle; 103 insulation section; 108 stay section; 104 cooling section; 105 discharge section; 106 buffer bin; 107 analysis tower feed valve;

2 adsorption tower; 201 adsorption tower feed valve;

3 Activated carbon storage bin;

4 Vibrating screen;

5Protection casing;

F1 hot air fan;

Hot blast stove L1;

G1 analytic tower feeder; G2 adsorption tower feeder;

S1 first activated carbon conveyor; S2 second activated carbon conveyor;

C1 belt scale.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present invention.

In some processes described in the specification and claims of the present invention and the above-mentioned drawings, multiple operations appearing in a specific order are included, but it should be clearly understood that these operations may not be performed in the order in which they appear in this document. Execution or parallel execution, the sequence numbers of operations, such as 101, 102, etc., are only used to distinguish different operations, and the sequence numbers themselves do not represent any execution order. In addition, these processes may include more or fewer operations, and these operations may be executed sequentially or in parallel. It should be noted that the descriptions of "first" and "second" in this article are used to distinguish different messages, devices, modules, etc., and do not represent a sequence, nor do they limit the "first" and "second" It is a different type.

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the protection scope of the present invention.

Please refer to FIG. 5 and FIG. 6. FIG. 5 is a schematic diagram of the structure of the analysis tower shown in an exemplary embodiment of the application; FIG. 6 is a schematic diagram of the distribution of temperature measuring elements of the analysis tower in FIG. 5.

As shown in Figure 5, in the present application, the analytical tower 1 includes a feed section 101, a heating section 102, a heat preservation section 103, a cooling section 104 and a discharge section 105, and a hot air baffle 1021 is provided in the heating section 102. The activated carbon that has adsorbed pollutants enters from the buffer bin 106, enters through the desorption tower feed valve 107, passes through the feed section 101, the heating section 102, the insulation section 103, the cooling section 104 and the discharge section 105 in turn, and finally passes through the desorption tower to feed The feeder G1 is discharged. The hot air system of the analysis tower 1 includes a hot blast stove L1 and a hot blast fan F1. The hot blast stove L1 heats the air. The hot blast fan F1 makes the heated air circulate rapidly, so that the hot air enters from the air inlet and flows out from the hot air outlet.

As shown in Figure 5, a temperature measuring element TF1 is installed at the hot air inlet to measure the temperature of the hot air inlet; a temperature measuring element TF2 is installed at the hot air outlet to measure the temperature of the hot air outlet. Set the flow monitoring element VF1 at the appropriate position of the hot air pipe to measure the hot air flow. A temperature measuring element 1TE is set on the starting plane of the heating section 102 of the analytical tower 1 to measure the starting temperature of the heating section 102; a temperature measuring element 2TE is set on the end plane of the heating section 102 of the analytical tower 1 to measure the heating section 102 The end temperature.

Specifically, as shown in Figure 6, there are nine thermocouples from 1TE11 to 1TE19 in 1TE of the analytical tower temperature measurement element (the number of thermocouples may not be limited to nine, as shown in the figure), and the wiring of each thermocouple is led out To the temperature measuring element 1TE1 terminal; the temperature measuring element 1TE1 is inserted into the protective sleeve; to protect the temperature measuring element from the erosion of the flowing activated carbon. On a temperature measurement plane, a number of analytical tower temperature measurement elements are evenly distributed (Figure 6 shows 1TE1～1TEn). It can be seen from the figure that the position of each thermocouple relative to the reference point is fixed. As long as the detection temperature of a certain temperature measuring element is known, the activated carbon temperature at its corresponding position will be known. The temperature measurement value of 1TE is the arithmetic average of the temperature measurement values of the thermocouples that constitute 1TE set at the beginning of the heating section.

In the same way, the arrangement of the temperature measuring element 2TE can also be the same as the arrangement of the temperature measuring element 1TE, so it will not be repeated here. Correspondingly, the temperature measurement value of the temperature measurement element 2TE is the arithmetic average of the temperature measurement values of the thermocouples forming 2TE set at the end of the heating section 102.

First, introduce the working principles used in the technical solution of this application for solving technical problems:

As shown in Figure 6, the heat of the heating section 102 of the analysis tower 1 comes from the hot blast stove L1, the activated carbon temperature rises consumes heat, the activated carbon analysis SQ2 consumes heat, and there is a part of heat dissipation. The heat generation and consumption are balanced, as shown in formula 1. :

Qf=Qt+Qj+Qs+Qz Formula 1

among them:

Qf: The input heat of the hot blast stove, in kilojoules;

Qt: Heat consumption by temperature rise of activated carbon, in kilojoules;

Qj: Heat consumption of activated carbon for SO ₂ analysis, in kilojoules;

Qs: System heat dissipation, in kilojoules;

Qz: Heating the remaining components consumes heat, in kilojoules.

In formula 1, the proportion of system heat dissipation Qs and heat consumption Qz of the remaining components of heating is very small, and its influence can be ignored in engineering applications. In actual use, formula 1 can be replaced by formula 2:

Qf=Qt+Qj Formula 2

among them:

Qf: The input heat of the hot blast stove, in kilojoules;

Qt: Heat consumption by temperature rise of activated carbon, in kilojoules;

Qj: The heat consumed by activated carbon to analyze SO _{2 in kilojoules.}

Activated carbon desorption of SO2 consumes heat related to the amount of SO2 absorbed by activated carbon. Activated carbon adsorbs SO2 in adsorption tower 2, and in desorption tower 1, the activated carbon that adsorbs SO2 is heated, and the activated carbon that adsorbs SO2 is heated to above 200 ℃ to release adsorption. SO2, the analysis process is an endothermic process. In practical applications, the SO2 content in the sintering flue gas content will not fluctuate sharply, and the relationship between Qt and Qj is shown in formula 3:

Qj=K1*Qt Formula 3

among them:

Qt: Heat consumption by temperature rise of activated carbon, in kilojoules;

Qj: Heat consumption of activated carbon for SO ₂ analysis, in kilojoules;

K1: 0.2～0.3, the coefficient is related to the pollutant content in the flue gas, here it is regarded as a constant, and the empirical value is taken.

From formula 2 and formula 3, the relationship between the input heat of the hot blast stove and the heat consumption of activated carbon temperature rise can be derived as shown in formula 4:

Qf=Qt+K1*Qt=(1+K1)*Qt=K*Qt Formula 4

among them:

Qf: The input heat of the hot blast stove, in kilojoules;

Qt: Heat consumption by temperature rise of activated carbon, in kilojoules;

K: 1.2～1.3, the coefficient is related to the content of pollutants in the flue gas, here it is regarded as a constant, and an empirical value is used.

As shown in Figure 6, the input heat of the hot blast stove can be calculated according to formula 5:

Qf=(T _TF1 –T _TF2 )*V _VF1 *Cf formula 5

among them:

Qf: The input heat of the hot blast stove, in kilojoules;

T _TF1 , T _TF2 : the temperature measured by the temperature measuring elements TF1, TF2, in K;

V _VF1 : The hot air flow value measured by the flow meter VF1, in kg/h;

Cf: Specific heat of hot air, constant, in kilojoules/(K*kg/h).

As shown in Figure 5, when the production is stable, the heat consumption of activated carbon temperature rise is calculated according to formula 6: (The definition of production stability: 1. When the activated carbon outlet temperature detection element detects the activated carbon is heated from the inlet; 2. The activated carbon is heated during the production process The flow rate and the pollutant emissions in the flue gas have not changed significantly.)

_{Qt = (T 2TE -T 1TE)} * V T * Ct Equation 6

among them:

Qt: Heat consumption of activated carbon temperature rise, unit kilojoule;

T _1TE, T _2TE: temperature measuring element 1TE, 2TE as measured by the K;

V _t : Activated carbon flow, unit kg/h;

Ct: Specific heat of activated carbon, constant, in kilojoules/(K*kg/h).

It can be derived from formula 4, formula 5, and formula 6:

_{K * (T 2TE -T 1TE)} * V T * Ct = (T TF1 -T TF2) * V VF1 * Cf Equation 7

among them:

Qt: Heat consumption of activated carbon temperature rise, unit kilojoule;

T _1TE, T _2TE: temperature measuring element 1TE, 2TE as measured by the K;

V _t : Activated carbon flow, unit kg/h;

Ct: Specific heat of activated carbon, constant, in kilojoules/(K*kg/h);

Qf: The input heat of the hot blast stove, in kilojoules;

T _TF1 , T _TF2 : the temperature measured by the temperature measuring elements TF1, TF2, in K;

V _VF1 : The hot air flow value measured by the flow meter VF1, in kg/h;

Cf: Specific heat of hot air, constant, in kilojoules/(K*kg/h);

K: 1.2～1.3, coefficient, adjusted according to production situation.

In formula 7, the specific heat of hot air Cf and the specific heat of activated carbon Ct are constants, and each temperature value can be obtained by the temperature measuring element, because the activated carbon in the adsorption tower 2 is finally discharged from the desorption tower feeder G1, so the desorption tower feeds The working flow rate of the machine G1 is equal to the flow rate V _T of the activated carbon in the heating section; the flow rate of the activated carbon V _T is proportional to the rotational speed of the desorption tower feeder G1. As shown in Equation 8:

V _T ＝K _G1 *F _G1 formula 8

among them:

V _T : Activated carbon flow, unit kg/h;

K _G1 : constant, determined by the design parameters of the feeder G1, unit kg/(h*RPM);

F _G1 : Feeder speed, unit RPM.

It should be noted that the rotation speed (Rotational Speed or Rev) is the number of turns that a circular motion object makes around the center of the circle in a unit time. The unit is expressed as RPM. RPM is the abbreviation of Revolutions Per minute, which is revolutions per minute. In this article, all RPMs stand for this meaning.

In formula 7, the air volume of the hot air blower F1 is proportional to the speed of the hot air blower F1. As shown in Equation 9:

V _VF1 = K _F1 *F _F1 formula 9

among them:

V _VF1 : Flow rate of hot air fan, unit kg/h;

K _F1 : constant, determined by the design parameters of fan F1, unit kg/(h*RPM);

F _F1 : Fan speed, unit RPM.

Substituting formula 8 and formula 9 into formula 7, it can be derived that the hot air fan speed F _F1 can be set according to the following formula:

_{K * (T 2TE -T 1TE)} * K G1 * F G1 * Ct = (T TF1 -T TF2) * K F1 * F F1 * Cf

among them:

T _1TE, T _2TE: temperature measuring element 1TE, 2TE as measured by the K;

K _G1 : constant, determined by the design parameters of the feeder G1, unit kg/(h*RPM);

F _G1 : Feeder speed, unit RPM;

Ct: Specific heat of activated carbon, constant, in kilojoules/(K*kg/h);

T _TF1 , T _TF2 : the temperature measured by the temperature measuring elements TF1, TF2, in K;

K _F1 : constant, determined by the design parameters of hot air blower F1, unit kg/(h*RPM);

F _F1 : fan speed, unit RPM;

Cf: Specific heat of hot air, constant, in kilojoules/(K*kg/h);

K: 1.2～1.3, coefficient, adjusted according to production situation.

As shown in Equation 10, the K, KG1, Ct, KF1, and Cf on the right side are all constants, so Equation 10 can be simplified to:

Among them: K _J is the coefficient, and its value:

K _J ＝(K*K _G1 *Ct)/(K _F1 *Cf)

The annotations of the symbols in Equation 11 are the same as those in Equation 10, and will not be repeated here.

Another derivation of Equation 10:

Among them: K _J is the coefficient, and its value:

K _J ＝(K*K _G1 *Ct)/(K _F1 *Cf)

The annotations of the symbols in Equation 11 are the same as those in Equation 10, and will not be repeated here.

As shown in Figure 5, the inlet air temperature of the hot blast of the analytical tower 1 is the outlet air temperature of the hot blast stove L1. The hot blast stove L1 is a hot blast output system with stable temperature, that is, the output temperature of the hot blast stove L1 is stable within the output power range of the hot blast stove L1. Corresponding to Formula 11, that is, the temperature of the hot air inlet temperature T _TF1 is a known value (about 430 ℃ in production), and _{the temperature of the hot air outlet temperature T TF2} is the value after the hot air and the activated carbon are heat exchanged and cooled. It is related to hot air flow, activated carbon flow, activated carbon temperature, etc.

As shown in Figure 5, in order to ensure the full analysis of activated carbon, the minimum temperature of the activated carbon outlet temperature is required to be higher than 380℃, because the existing analysis tower hot blast stove L1 system control is not accurate, the hot air margin is large, the activated carbon outlet temperature will reach 410℃; Corresponding to formula 11, that is, the activated carbon outlet temperature of the heating section is the control target of the system, and the control temperature is the lowest temperature that the activated carbon can fully resolve (for example, 395℃, which can be adjusted as needed). For example, the activated carbon outlet temperature, that is, the heating section 102 If the end temperature T _{2TE is} higher than the control temperature, the hot air circulation will be reduced and the heat output of the hot blast stove L1 system will be reduced. If the end temperature T _{2TE of the} heating section 102 is lower than the control temperature, the hot air circulation will be increased and the heat of the hot blast stove system will be increased. Output.

As shown in Figure 5, when the desorption tower 1 is in normal production, the activated carbon in the heating section 102 of the desorption tower 1 flows normally, and the activated carbon in the heating section 102 of the desorption tower 1 passes through all the heating sections 102 at a flow rate of v1. The heating time of all activated carbon is All are L/v1, and the activated carbon is continuously heated throughout the heating section 102.

As shown in Figure 7, the analytical tower control system _{adjusts the hot air blower by comparing the temperature value T 2TE} detected by the 2TE with the value of the control temperature.

As shown in Equation 11:

Among them: K _J is the coefficient, and its value:

K _J ＝(K*K _G1 *Ct)/(K _F1 *Cf)

T _1TE, T _2TE: temperature measuring element 1TE, 2TE as measured by the K;

K _G1 : constant, determined by the design parameters of the feeder G1, unit kg/(h*RPM);

F _G1 : Feeder speed, unit RPM;

Ct: Specific heat of activated carbon, constant, in kilojoules/(K*kg/h);

T _TF1 , T _TF2 : the temperature measured by the temperature measuring elements TF1, TF2, in K;

K _F1 : constant, determined by the design parameters of fan F1, unit kg/(h*RPM);

F _F1 : fan speed, unit RPM;

Cf: Specific heat of hot air, constant, in kilojoules/(K*kg/h);

K: 1.2～1.3, coefficient, adjusted according to production situation.

Equation 11 can be derived from Equation 13:

The annotations of the symbols in Equation 13 are the same as those in Equation 10, and will not be repeated here.

As shown in formula 13, the coefficient K _{J is} related to a series of parameters such as feeder design parameters, fan design parameters, coefficient K, activated carbon specific heat, hot air specific heat, etc. It is often difficult to obtain these parameters in actual production.

As shown in Equation 13, when parsing stable production column, the right side of Equation 13 _{T TF1, T TF2, T 1TE} , T 2TE, F G1, F G2 can be read directly from the computer control system; thus by equation 13 Calculate the value of K _{J , and then substitute K J} into formula 12 according to the control target to calculate the working speed value of the hot air blower.

The above is the technical solution of this application to solve the technical problem, and the working principle used.

Now, let us specifically introduce the embodiments of the technical solution of the present application.

Please refer to FIG. 7, which is a logic flow chart of a method for controlling a hot air blower of an analytical tower shown in an exemplary embodiment of the application.

In an embodiment of this application, this application includes the following steps:

Step S101: When the analysis tower 1 is working normally, the production heat exchange coefficient of the heating section 102 of the current analysis tower 1 is obtained.

Step S102: Obtain the end-point target control temperature of the heating section 102 of the analytical tower 1; it should be noted that the end-point target control temperature is derived from experimental data, and may be set to 395°C, for example.

Step S103: derive the fan speed of the hot air fan F1 based on the production heat exchange coefficient and the end-point target control temperature.

Step S104: the hot air blower F1 obtains the fan rotation speed in the previous step for a predetermined working period;

Step S105: detecting the actual temperature at the end of the heating section 102;

When the actual end temperature does not meet the predetermined threshold range, step S101 is repeated until the detected actual end temperature meets the predetermined threshold range. The threshold range may specifically be that the absolute value of the difference between the actual temperature at the end point and the target control temperature at the end point is less than or equal to 5°C.

This method can accurately control the speed of the hot air blower F1 according to the target control temperature at the end of the heating section 102, thereby effectively preventing the hot air stove L1 from inputting too much heat and causing the problem of wasting electric energy and fuel.

In the foregoing embodiment, further improvements can be made to obtain another embodiment of the present application.

Specifically, in this embodiment, in the above step S101, the step of obtaining the production heat exchange coefficient of the heating section 102 of the current analysis tower 1 includes:

Obtain the hot air inlet temperature of the heating section 102 and the hot air outlet temperature of the heating section 102 of the analytical tower 1;

Acquiring the starting temperature of the heating section 102 and the ending temperature of the heating section 102;

Obtain the current fan speed of the hot air fan F1 and the current feeder speed of the feeder of the analysis tower 1;

Based on the hot air inlet temperature, the hot air outlet temperature, the starting temperature, the ending temperature, the current fan speed, and the current feeder speed, the production heat exchange coefficient of the heating section 102 of the analytical tower 1 is obtained.

It should be noted that when step S101 is repeatedly performed, the above temperature values need to be re-measured, and therefore the production heat exchange coefficient also needs to be re-calculated. Of course, to be specific, we can get the relational expression of the production heat exchange coefficient based on the working principle introduced above:

Based on the hot air inlet temperature, the hot air outlet temperature, the starting point temperature, the ending temperature, the current fan speed, and the current feeder speed, the steps to obtain the production heat exchange coefficient of the heating section 102 of the analytical tower 1 include:

Based on the following logical relationship, the production heat exchange coefficient is obtained:

Among them, K _J means production heat exchange coefficient, T _TF1 means hot air inlet temperature; T _TF2 means hot air outlet temperature; T _1TE means starting point temperature; T _2TE means ending temperature; F _F1 means current fan speed; F _G1 means current feeder Rotating speed.

As introduced above, the production heat exchange coefficient K _{J is} related to a series of parameters such as feeder design parameters, fan design parameters, coefficient K, activated carbon specific heat, hot air specific heat, etc.; but in actual production, it is often difficult to obtain these parameters . However, in the above formula, the four temperature values and two rotation speeds can be obtained relatively easily, so the production heat exchange coefficient can be obtained very easily.

Further, in this kind of embodiment, we can design the specific method of obtaining the fan speed of the hot air fan F1.

For example, based on the production heat exchange coefficient, hot air inlet temperature, hot air outlet temperature, starting point temperature, end target control temperature, and current feeder speed, the steps to obtain the fan speed of hot air fan F1 include:

Based on the following logical relationship, the fan speed is obtained:

Among them, F _f1 is the fan speed; K _J is the production heat exchange coefficient, T _TF1 is the hot air inlet temperature; T _TF2 is the hot air outlet temperature; T _1TE is the starting temperature; TK is the end target control temperature; F _G1 is the current feeder Rotating speed.

It can be seen from the above formula that under the premise of obtaining the production heat exchange coefficient, based on the above-mentioned end-point target control temperature, we can easily accurately control the speed of the hot air blower F1, thereby achieving energy-saving operation.

In any of the above embodiments, we can also make specific designs for obtaining methods for each temperature. For example, the endpoint temperature is obtained through the following steps:

Acquiring the temperature at each predetermined temperature measurement point in the terminal plane of the heating section 102;

The terminal temperature is obtained based on the arithmetic mean of the temperature at each temperature measurement point.

For example, the starting temperature is obtained through the following steps:

Acquiring the temperature at each predetermined temperature measurement point in the starting point plane of the heating section 102;

The starting point temperature is obtained based on the arithmetic mean of the temperature at each temperature measurement point.

Obviously, it will be more accurate to obtain the starting temperature and the ending temperature by this method.

Please refer to Figures 5 and 6, the present application also provides a hot air fan F1 control device of the analysis tower 1, which is used to control the speed of the hot air fan F1 of the analysis tower 1, including the analysis tower 1, and the analysis tower 1 includes:

The heating section 102 is used to heat the activated carbon flowing through the analysis tower 1;

The hot air fan F1 is used to blow hot air into the heating section 102 of the analysis tower 1;

Feeder, used to control the discharge flow of activated carbon in the analysis tower 1;

Analysis tower 1 includes:

The first temperature measuring element is used to obtain the hot air inlet temperature of the heating section 102 of the analytical tower 1;

The second temperature measuring element is used to obtain the temperature of the hot air outlet of the heating section 102;

The third temperature measuring element is used to obtain the starting temperature of the heating section 102;

The fourth temperature measuring element is used to obtain the end temperature of the heating section 102;

It should be noted that, in order to facilitate the distinction, the numbering of the temperature measuring elements here is only for the need of expression, and is not inconsistent with the foregoing. The first temperature measurement file is the temperature measurement element TF1 used to measure the hot air inlet temperature in Figure 5, and the second temperature measurement file is the temperature measurement element TF2 used to measure the hot air outlet temperature in Figure 5; the third temperature measurement file is also It is the temperature measuring element 1TE used to measure the starting temperature of the heating section 102 in FIG. 5, and the fourth temperature measurement file is the temperature measuring element 2TE used to measure the end temperature of the heating section 102 in FIG. 5.

The first calculation unit is used to obtain the heating section 102 of the analytical tower 1 based on the hot air inlet temperature, the hot air outlet temperature, the starting temperature, the ending temperature, the current fan speed of the hot air fan F1, and the current feeder speed of the feeder Production heat exchange coefficient;

The second calculation unit is used to obtain the fan speed of the hot air blower F1 based on the production heat exchange coefficient, the hot air inlet temperature, the hot air outlet temperature, the starting point temperature, the end target control temperature of the heating section 102, and the current feeder speed.

The design of the above device can accurately control the speed of the hot blast fan F1 according to the target control temperature at the end of the heating section 102, so as to effectively avoid the hot blast stove L1 from inputting too much heat, causing the problem of wasting electric energy and fuel.

In the above device, further improvements can be made. For example, the first calculation unit obtains the production heat exchange coefficient based on the following logical relationship:

Among them, K _J means production heat exchange coefficient, T _TF1 means hot air inlet temperature; T _TF2 means hot air outlet temperature; T _1TE means starting point temperature; T _2TE means ending temperature; F _F1 means current fan speed; F _G1 means current feeder Rotating speed.

Further, the second calculation unit obtains the fan speed of the hot air fan F1 based on the following logical relationship:

Among them, F _f1 is the fan speed; K _J is the production heat exchange coefficient, T _TF1 is the hot air inlet temperature; T _TF2 is the hot air outlet temperature; T _1TE is the starting temperature; TK is the end target control temperature; F _G1 is the current feeder Rotating speed.

In addition, in the above-mentioned embodiments, the layout of the temperature measuring elements can be specifically designed. For example, as shown in FIG. 6, there are multiple third temperature measuring elements, and they are evenly distributed in the starting plane of the heating section 102; each third temperature measuring element is provided with a plurality of thermocouples for temperature measurement. A protective sleeve 5 is provided outside the third temperature measuring element.

For example, as shown in FIG. 6, there are multiple fourth temperature measuring elements, and they are evenly distributed in the end plane of the heating section 102; each fourth temperature measuring element is provided with a plurality of thermocouples for temperature measurement. A protective sleeve 5 is provided on the outside of the fourth temperature measuring element.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, the specific working processes and corresponding technical effects of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments. Go into details again.

The device embodiments described above are merely illustrative, where the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place. , Or it can be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments. Those of ordinary skill in the art can understand and implement without creative work.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions recorded in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (16)

1. A method for controlling a hot air blower of an analytical tower is used to control the speed of a hot air blower of an analytical tower, characterized in that the hot air blower control method includes the following steps:

   When the analysis tower is working normally, obtain the production heat exchange coefficient of the heating section of the current analysis tower;

   Obtaining the end-point target control temperature of the heating section of the analytical tower;

   The fan speed of the hot air fan is obtained based on the production heat exchange coefficient and the end-point target control temperature.
2. The hot air blower control method of the analytical tower according to claim 1, wherein the hot air blower control method comprises the following steps:

   The hot air fan has a predetermined working period of time for the fan rotation speed obtained in the previous step;

   Detecting the actual end-point temperature of the heating section;

   When the actual temperature at the end point does not meet the predetermined threshold range, the following steps are cyclically executed:

   Obtaining the production heat exchange coefficient of the heating section of the current analysis tower;

   Based on the production heat exchange coefficient and the end-point target control temperature, the fan speed of the hot air fan at this time is obtained again;

   The hot air blower operates for a predetermined period of time at the blower speed obtained again;

   The actual temperature at the end of the heating section is detected.
3. The method for controlling the hot air blower of the analytical tower according to claim 1, wherein:

   The step of obtaining the production heat exchange coefficient of the heating section of the current analysis tower includes:

   Acquiring the hot air inlet temperature of the heating section of the analysis tower and the hot air outlet temperature of the heating section;

   Acquiring the starting temperature of the heating section and the ending temperature of the heating section;

   Acquiring the current fan speed of the hot air blower and the current feeder speed of the feeder of the analysis tower;

   Based on the hot air inlet temperature, the hot air outlet temperature, the starting temperature, the ending temperature, the current fan speed, and the current feeder speed, the production heat exchange of the heating section of the analysis tower is obtained coefficient.
4. The method for controlling the hot air blower of the analytical tower according to claim 3, characterized in that:

   The production of the heating section of the analysis tower is obtained based on the hot air inlet temperature, the hot air outlet temperature, the starting temperature, the ending temperature, the current fan speed, and the current feeder speed The steps of heat exchange coefficient include:

   Based on the following logical relationship, the production heat exchange coefficient is obtained:

   

   Wherein, K _J represents the production heat exchange coefficient, T _TF1 represents the hot air inlet temperature; T _TF2 represents the hot air outlet temperature; T _1TE represents the starting temperature; T _2TE represents the end temperature; F _F1 represents the temperature The current fan speed; F _G1 represents the current feeder speed.
5. The method for controlling the hot air blower of the analytical tower according to claim 1, wherein:

   The step of obtaining the fan speed of the hot air fan based on the production heat exchange coefficient and the end-point target control temperature includes:

   Acquiring the hot air inlet temperature of the heating section of the analysis tower and the hot air outlet temperature of the heating section;

   Acquiring the starting temperature of the heating section and the end target control temperature of the heating section;

   Acquiring the current feeder speed of the feeder of the analysis tower;

   Based on the production heat exchange coefficient, the hot air inlet temperature, the hot air outlet temperature, the starting point temperature, the end target control temperature, and the current feeder speed, the fan speed of the hot air blower is obtained.
6. The method for controlling the hot air blower of the analytical tower according to claim 5, wherein:

   Said based on said production heat exchange coefficient, said hot air inlet temperature, said hot air outlet temperature, said starting point temperature, said end target control temperature, and said current feeder speed to obtain the fan of said hot air blower The steps of speed include:

   Based on the following logical relationship, the fan speed is obtained:

   

   Wherein, F _f1 represents the fan speed; K _J represents the production heat exchange coefficient, T _TF1 represents the hot air inlet temperature; T _TF2 represents the hot air outlet temperature; T _1TE represents the starting temperature; TK represents the End point target control temperature; F _G1 represents the current feeder speed.
7. The method for controlling the hot air blower of the analytical tower according to claim 2-6, characterized in that:

   The predetermined duration is obtained through the following steps:

   Obtaining the flow rate of the activated carbon in the analysis tower;

   Obtaining the length of the heating section;

   The ratio of the length of the heating section to the flow rate of the activated carbon, and the ratio is multiplied by a predetermined multiple to obtain the predetermined duration.
8. The hot air blower control method of the analytical tower according to any one of claims 2-6, characterized in that:

   The starting temperature is obtained by the following steps:

   Acquiring the temperature at each predetermined temperature measurement point in the starting point plane of the heating section;

   The starting temperature is obtained based on the arithmetic mean of the temperature at each temperature measurement point.
9. The hot air blower control method of the analytical tower according to any one of claims 2-6, characterized in that:

   The endpoint temperature is obtained through the following steps:

   Acquiring the temperature at each predetermined temperature measurement point in the terminal plane of the heating section;

   The terminal temperature is obtained based on the arithmetic mean of the temperature at each temperature measurement point.
10. A hot air blower control device of a desorption tower, which is used to control the rotation speed of the hot air blower of the desorption tower, and includes a desorption tower, and the desorption tower includes:

    The heating section is used to heat the activated carbon flowing through the analysis tower;

    The hot air blower is used to blow hot air into the heating section of the analysis tower;

    A feeder for controlling the discharge flow rate of the activated carbon in the analysis tower;

    It is characterized in that the analysis tower includes:

    The first temperature measuring element is used to obtain the hot air inlet temperature of the heating section of the analysis tower;

    The second temperature measuring element is used to obtain the hot air outlet temperature of the heating section;

    The third temperature measuring element is used to obtain the starting temperature of the heating section;

    The fourth temperature measuring element is used to obtain the end temperature of the heating section;

    The first calculation unit is configured to be based on the hot air inlet temperature, the hot air outlet temperature, the starting point temperature, the ending temperature, the current fan speed of the hot air blower, and the current feeder speed of the feeder , Obtain the production heat exchange coefficient of the heating section of the analytical tower;

    The second calculation unit is used to control the temperature based on the production heat exchange coefficient, the hot air inlet temperature, the hot air outlet temperature, the starting point temperature, the end point target control temperature of the heating section, and the current feeder speed, Obtain the fan speed of the hot air fan.
11. The hot air blower control device of the analytical tower according to claim 10, characterized in that:

    The first calculation unit obtains the production heat exchange coefficient based on the following logical relationship:

    

    Wherein, K _J represents the production heat exchange coefficient, T _TF1 represents the hot air inlet temperature; T _TF2 represents the hot air outlet temperature; T _1TE represents the starting temperature; T _2TE represents the end temperature; F _F1 represents the temperature The current fan speed; F _G1 represents the current feeder speed.
12. The hot air blower control device of the analytical tower according to claim 10, characterized in that:

    The second calculation unit obtains the fan speed of the hot air fan based on the following logical relationship:

    

    Wherein, F _f1 represents the fan speed; K _J represents the production heat exchange coefficient, T _TF1 represents the hot air inlet temperature; T _TF2 represents the hot air outlet temperature; T _1TE represents the starting temperature; TK represents the End point target control temperature; F _G1 represents the current feeder speed.
13. The hot air blower control device of the analytical tower according to any one of claims 10-12, wherein:

    There are multiple third temperature measuring elements, and they are evenly distributed in the starting plane of the heating section;

    Each of the third temperature measuring elements is provided with a plurality of thermocouples for temperature measurement.
14. The hot air blower control device of the analytical tower according to claim 13, characterized in that:

    A protective sleeve is provided on the outside of the third temperature measuring element.
15. The hot air blower control device of the analytical tower according to any one of claims 10-12, wherein:

    There are multiple fourth temperature measuring elements, and they are evenly distributed in the end plane of the heating section;

    Each of the fourth temperature measuring elements is provided with a plurality of thermocouples for temperature measurement.
16. The hot air blower control device of the analytical tower according to claim 15, wherein a protective sleeve is provided outside the fourth temperature measuring element.

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