阅读说明：本技术 一种干法除尘用蒸发冷却器的水量调节方法及其系统 (Water quantity adjusting method and system of evaporative cooler for dry dedusting ) 是由 王阳 郑鹏辉 沈建涛 高燕军 吴涛 马稳锋 孟晨 洪利强 于 2019-11-06 设计创作，主要内容包括：本发明提供了一种干法除尘用蒸发冷却器的水量调节方法及其系统,涉及转炉干法除尘领域。干法除尘用蒸发冷却器的水量调节方法包括：步骤一、确定蒸发冷却器的冷却出口的烟气设定温度t0,选取至少三个预设开度w<Sub>1</Sub>、w<Sub>2</Sub>、w<Sub>3</Sub>；步骤二、按照至少三个预设开度w<Sub>1</Sub>、w<Sub>2</Sub>、w<Sub>3</Sub>分别控制冷却水阀供水,并测定蒸发冷却器的冷却出口的对应烟气预设温度t<Sub>1</Sub>、t<Sub>2</Sub>、t<Sub>3</Sub>；步骤三、将至少三个预设开度w<Sub>1</Sub>、w<Sub>2</Sub>、w<Sub>3</Sub>和对应烟气预设温度t<Sub>1</Sub>、t<Sub>2</Sub>、t<Sub>3</Sub>绘制在开度(w)与烟气温度(t)的平面坐标系中,拟合出开度(w)与烟气温度(t)的一次函数图像,在一次函数图像中选定对应烟气设定温度t<Sub>0</Sub>的目标开度w<Sub>0</Sub>；步骤四、按照目标开度w<Sub>0</Sub>控制冷却水阀供水,修正目标开度w<Sub>0</Sub>。(The invention provides a water quantity adjusting method and a water quantity adjusting system of an evaporative cooler for dry dedusting, and relates to the field of dry dedusting of a converter. The water quantity adjusting method of the evaporative cooler for dry dedusting comprises the following steps: step one, determining the set temperature t0 of the flue gas at the cooling outlet of the evaporative cooler, and selecting at least three preset opening degrees w 1 、w 2 、w 3 (ii) a Step two, according to at least three preset opening degrees w 1 、w 2 、w 3 Respectively controlling a cooling water valve to supply water, and measuring the corresponding preset flue gas temperature t of a cooling outlet of the evaporative cooler 1 、t 2 、t 3 (ii) a Step three, at least three preset opening degrees w 1 、w 2 、w 3 And corresponding to preset temperature t of flue gas 1 、t 2 、t 3 Drawing in a plane coordinate system of the opening degree (w) and the flue gas temperature (t), fitting a linear function image of the opening degree (w) and the flue gas temperature (t), and selecting the corresponding flue gas set temperature t from the linear function image 0 Target opening degree w 0 (ii) a Step by stepStep four, according to the target opening degree w 0 Controlling the cooling water valve to supply water and correcting the target opening w 0 。)

1. A water quantity adjusting method of an evaporative cooler for dry dedusting is characterized by comprising the following steps:

step one, determining the set temperature t of the flue gas at the cooling outlet of the evaporative cooler₀Selecting at least three preset opening degrees, which are respectively w₁、w₂、w₃；

Step two, according to at least three preset opening degrees w₁、w₂、w₃Respectively controlling a cooling water valve to supply water, and measuring the corresponding preset flue gas temperature t of a cooling outlet of the evaporative cooler₁、t₂、t₃；

Step three, at least three preset opening degrees w₁、w₂、w₃And corresponding to preset temperature t of flue gas₁、t₂、t₃Drawing in a plane coordinate system of the opening degree (w) and the flue gas temperature (t), fitting a linear function image of the opening degree (w) and the flue gas temperature (t), and selecting the corresponding flue gas set temperature t from the linear function image₀Target opening degree w₀；

Step four, according to the target opening degree w₀Controlling a cooling water valve to supply water according to the actual temperature t of the flue gas_SWith set temperature t of flue gas₀Correcting the target opening w in the forward direction₀。

2. The method as set forth in claim 1, wherein in the first step, the at least three preset opening degrees w are set₁、w₂、w₃In order to increase or decrease the sequence, the phase difference Δ w between the two adjacent preset opening degrees is equal.

3. The method as claimed in claim 2, wherein the difference Δ w between the two predetermined opening degrees is between 5% and 20%.

4. The method as set forth in claim 1, wherein said preset opening degrees are selected to be five in the first step, and the five preset opening degrees are w₁、w₂、w₃、w₄And w₅The difference Δ w between two adjacent preset opening degrees is 10%.

5. According to claimThe method for adjusting the amount of water in an evaporative cooler for dry dedusting as set forth in claim 1, wherein the water flow rate in the evaporative cooler for dry dedusting is adjusted by adjusting the opening degree w of the evaporative cooler for dry dedusting in the third step₁、w₂、w₃And corresponding to preset temperature t of flue gas₁、t₂、t₃The formed preset points are positioned on the primary function image or are distributed on two sides of the primary function image in a discrete mode.

6. The method of claim 1, wherein the target opening degree w is set to a value corresponding to the target opening degree w₀The single correction amount of the temperature sensor is between 0.1% and 2%, and the temperature sensor is corrected for a plurality of times until the actual temperature t of the flue gas at the cooling outlet of the evaporative cooler_SEqual to the set temperature t of the flue gas₀。

7. The method of claim 1, wherein the target opening degree w is corrected in the fourth step₀According to the actual temperature change delta t of the flue gas in unit time dT_SThe corrected temperature change rate v is determined as Δ t_SIf v is more than or equal to 1 ℃/s, the single correction is reduced; if v is less than 0.5 ℃/s, the single correction amount is increased.

8. A water quantity regulating system of an evaporative cooler for dry dedusting is characterized by comprising the evaporative cooler, a simulation module and a correction module, wherein the evaporative cooler is provided with a flue gas inlet and a cooling outlet, and the flue gas inlet is provided with a cooling water pipeline and a cooling water valve which is connected in series with the cooling water pipeline; the cooling outlet is provided with a temperature measuring module for detecting the actual temperature of the flue gas at the cooling outlet of the evaporative cooler;

the simulation module is electrically connected with the cooling water valve and the temperature measurement module and is used for presetting the opening degree w according to at least three₁、w₂、w₃And corresponding to preset temperature t of flue gas₁、t₂、t₃Fitting a linear function image of the opening degree (w) and the smoke temperature (t) in a plane coordinate system of the opening degree (w) and the smoke temperature (t), andselecting corresponding smoke gas set temperature t in the linear function image₀Target opening degree w₀；

The correction module is electrically connected with the cooling water valve and the temperature measurement module and used for measuring the actual temperature t of the flue gas_SWith set temperature t of flue gas₀Correcting the target opening w in the forward direction₀。

9. The system of claim 8, wherein the at least three preset openings w are defined by a predetermined distance w₁、w₂、w₃In order to increase or decrease the sequence, the phase difference Δ w between the two adjacent preset opening degrees is equal.

10. The system of claim 8, wherein the target opening degree w in the correction module is set to be smaller than the target opening degree w in the evaporation cooler for dry dedusting₀The single correction amount of the temperature sensor is between 0.1% and 2%, and the temperature sensor is corrected for a plurality of times until the actual temperature t of the flue gas at the cooling outlet of the evaporative cooler_SEqual to the set temperature t of the flue gas₀。

Technical Field

The invention relates to the technical field of dry dedusting of converters, in particular to a water quantity adjusting method and a water quantity adjusting system of an evaporative cooler for dry dedusting.

Background

In the metallurgical industry, flue gas dust removal technologies mainly comprise wet dust removal and dry dust removal, wherein the dry dust removal technology has the advantages of low energy consumption, low water consumption and the like.

The key equipment of the dry dedusting technology comprises an evaporative cooler and an electrostatic precipitator, wherein the evaporative cooler is adopted to cool high-temperature flue gas firstly, so that the temperature of the flue gas at a cooling outlet is maintained to be between 150 and 350 ℃, the flue gas is ensured not to be too high to burn the electrostatic precipitator at the later stage, and the flue gas is not too low to condense steam to generate dust and mud.

For example, chinese patent application publication No. CN103589822A and application publication No. 2014.02.19 disclose a method for controlling the outlet temperature of an evaporative cooler for dry dedusting of a converter, and specifically disclose that the method for controlling the outlet temperature of the evaporative cooler for dry dedusting of a converter is implemented by controlling the flow rate of cooling water, the pressure of water distribution and the pressure of an atomizing medium according to the change of the flue gas temperature in different blowing processes. When the top blowing of oxygen of the converter is started, the atomized medium cut-off valve is opened; when the inlet flue gas temperature T1 is less than 350 ℃, no water is added; when the temperature T1 is more than or equal to 350 ℃, a water supply cut-off valve is opened, a water supply flow regulating valve and an atomized medium pressure regulating valve are regulated, so that the cooling water flow is 24-27 m3/h, the water distribution pressure is 1.1-1.4 MPa, and the atomized medium pressure is 0.93-0.98 MPa; and closing the water supply cut-off valve and the atomized medium cut-off valve when the temperature T1 of the flue gas at the inlet of the converter is less than 350 ℃ after the top blowing of the oxygen is finished.

The water quantity of the cooling water is adjusted according to the temperature of the inlet flue gas, and the cooling water is used for evaporating and absorbing heat and reducing the temperature of the flue gas. However, the upper limit value of the temperature of the flue gas entering the evaporative cooler is high, and the change of the temperature of the flue gas in the evaporative cooler has hysteresis, so that the water amount of the cooling water is controlled only according to the temperature of the inlet flue gas, and the temperature of the flue gas at the cooling outlet cannot be ensured to meet the requirement.

If China patent with publication number CN106048130B and publication number 2018.01.12 discloses a system and a method for controlling the temperature of flue gas at the outlet of an evaporative cooler for dry dedusting of a converter, and specifically discloses that the control system comprises: the cooling water flow regulating valve is arranged at a cooling water inlet of the evaporative cooler; the outlet temperature detection device is used for detecting the temperature of the flue gas at the outlet of the evaporative cooler; and the fuzzy controller divides the dry dedusting process of the converter into a first stage and a second stage, and respectively controls the opening of the cooling water flow regulating valve in the first stage and the opening of the cooling water flow regulating valve in the second stage by adopting one-dimensional and at least two-dimensional fuzzy control rules.

In the first stage, the temperature of the outlet rises to a stable state from the beginning of oxygen blowing of the converter, and the opening degree of the cooling water flow regulating valve is controlled according to the outlet temperature and the set temperature difference of the outlet by a one-dimensional fuzzy control rule; and in the second stage, the temperature is reduced to the specified temperature of the dust remover from the stable state to the outlet temperature, and the opening degree of the cooling water flow regulating valve is controlled according to a plurality of parameters through at least two-dimensional fuzzy control rules. The fuzzy controller also constructs a fuzzy rule query table according to the fuzzy control rule and the parameter for controlling the cooling water flow regulating valve, and obtains the opening degree of the cooling water flow regulating valve by querying the fuzzy rule query table according to the detected parameter value.

In actual use, the opening degree of the cooling water valve needs to be continuously adjusted according to the difference value between the outlet temperature and the outlet set temperature and the rising rate of the outlet temperature by combining the fuzzy rule lookup table, and finally the outlet temperature reaches the outlet set temperature, so that the opening degree of the cooling water valve cannot be accurately and quickly determined.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a water amount adjusting method for an evaporative cooler for dry dedusting, so as to solve the problem that the opening degree of a cooling water valve cannot be accurately and quickly determined because the opening degree of the cooling water valve needs to be continuously adjusted by combining with a fuzzy rule look-up table when the temperature of a cooling outlet is adjusted in the prior art. The invention also aims to provide a water quantity regulating system of the evaporative cooler for dry dedusting.

The technical scheme of the water quantity adjusting method of the evaporative cooler for dry dedusting is as follows:

the water quantity adjusting method of the evaporative cooler for dry dedusting comprises the following steps:

step one, determining the set temperature t of the flue gas at the cooling outlet of the evaporative cooler₀Selecting at least three preset opening degrees, which are respectively w₁、w₂、w₃(ii) a Step two, according to at least three preset opening degrees w₁、w₂、w₃Respectively controlling a cooling water valve to supply water, and measuring the corresponding preset flue gas temperature t of a cooling outlet of the evaporative cooler₁、t₂、t₃(ii) a Step three, at least three preset opening degrees w₁、w₂、w₃And corresponding to preset temperature t of flue gas₁、t₂、t₃Drawing in a plane coordinate system of the opening degree (w) and the flue gas temperature (t), fitting a linear function image of the opening degree (w) and the flue gas temperature (t), and selecting the corresponding flue gas set temperature t from the linear function image₀Target opening degree w₀(ii) a Step four, according to the target opening degree w₀Controlling a cooling water valve to supply water according to the actual temperature t of the flue gas_SWith set temperature t of flue gas₀Correcting the target opening w in the forward direction₀。

Has the advantages that: according to the fitted linear function image of the opening (w) and the flue gas temperature (t), selecting the corresponding flue gas set temperature t from the linear function image₀Target opening degree w₀And according to the target opening degree w₀Control ofForward correction target opening w after water supply of cooling water valve₀The method and the device have the advantages that the opening of the cooling water valve is continuously adjusted by combining a fuzzy rule look-up table, and the required opening of the cooling water valve can be accurately and quickly determined. Theoretically, the method comprises the following steps: the opening degree of the cooling water valve determines the flow rate of the cooling water, and according to a heat calculation formula: q is cm delta t, and the heat absorbed by the cooling water entering the evaporative cooler in unit time after being heated from normal temperature to a steam state is positively correlated with the opening degree of a cooling water valve; the flow rate of the flue gas discharged from the cooling outlet of the evaporative cooler is constant, namely the amount of the flue gas passing through the evaporative cooler in unit time is constant, and the same principle is that according to a heat calculation formula: when the temperature of the flue gas is discharged from the cooling outlet of the evaporative cooler, Q is cm delta t, the temperature of the flue gas is inversely related to the heat emitted by the flue gas, and the heat absorbed by the cooling water from the normal temperature to the steam state is equal to the heat emitted by the flue gas, so that the temperature of the flue gas when the flue gas is discharged from the cooling outlet of the evaporative cooler is inversely related to the opening degree of the cooling water valve, and the linear function relation between the opening degree (w) and the temperature (t) of the flue gas is met.

Further, in the step one, the at least three preset opening degrees w₁、w₂、w₃In order to increase or decrease the sequence, the phase difference Δ w between the two adjacent preset opening degrees is equal.

Further, the difference Δ w between the two adjacent preset opening degrees is between 5% and 20%.

Further, in the step one, five preset opening degrees are selected, and the five preset opening degrees are w respectively₁、w₂、w₃、w₄And w₅The difference Δ w between two adjacent preset opening degrees is 10%.

Further, in step three, at least three preset opening degrees w₁、w₂、w₃And corresponding to preset temperature t of flue gas₁、t₂、t₃The formed preset points are positioned on the primary function image or are distributed on two sides of the primary function image in a discrete mode.

Further, in step four, the target opening degree w₀The single correction amount of (1) is between 0.1% and 2%, and multiple corrections are carried out until evaporation coolingActual temperature t of flue gas at cooling outlet of cooler_SEqual to the set temperature t of the flue gas₀。

Further, in step four, the target opening degree w is corrected₀According to the actual temperature change delta t of the flue gas in unit time dT_SThe corrected temperature change rate v is determined as Δ t_SIf v is more than or equal to 1 ℃/s, the single correction is reduced; if v is less than 0.5 ℃/s, the single correction amount is increased.

The technical scheme of the water quantity regulating system of the evaporative cooler for dry dedusting is as follows:

the water quantity regulating system of the evaporative cooler for dry dedusting comprises an evaporative cooler, a simulation module and a correction module, wherein the evaporative cooler is provided with a flue gas inlet and a cooling outlet, and the flue gas inlet is provided with a cooling water pipeline and a cooling water valve connected in series on the cooling water pipeline; the cooling outlet is provided with a temperature measuring module for detecting the actual temperature of the flue gas at the cooling outlet of the evaporative cooler;

the simulation module is electrically connected with the cooling water valve and the temperature measurement module and is used for presetting the opening degree w according to at least three₁、w₂、w₃And corresponding to preset temperature t of flue gas₁、t₂、t₃Fitting a linear function image of the opening degree (w) and the smoke temperature (t) in a plane coordinate system of the opening degree (w) and the smoke temperature (t), and selecting the corresponding smoke set temperature t from the linear function image₀Target opening degree w₀；

The correction module is electrically connected with the cooling water valve and the temperature measurement module and used for measuring the actual temperature t of the flue gas_SWith set temperature t of flue gas₀Correcting the target opening w in the forward direction₀。

Has the advantages that: according to the fitted linear function image of the opening (w) and the flue gas temperature (t), selecting the corresponding flue gas set temperature t from the linear function image₀Target opening degree w₀And according to the target opening degree w₀Controlling the forward correction target opening w after the cooling water valve supplies water₀Eliminating the need to constantly adjust the cooling water valve in conjunction with fuzzy rule look-up tablesThe opening degree can accurately and quickly determine the required opening degree of the cooling water valve. Theoretically, the method comprises the following steps: the opening degree of the cooling water valve determines the flow rate of the cooling water, and according to a heat calculation formula: q is cm delta t, and the heat absorbed by the cooling water entering the evaporative cooler in unit time after being heated from normal temperature to a steam state is positively correlated with the opening degree of a cooling water valve; the flow rate of the flue gas discharged from the cooling outlet of the evaporative cooler is constant, namely the amount of the flue gas passing through the evaporative cooler in unit time is constant, and the same principle is that according to a heat calculation formula: when the temperature of the flue gas is discharged from the cooling outlet of the evaporative cooler, Q is cm delta t, the temperature of the flue gas is inversely related to the heat emitted by the flue gas, and the heat absorbed by the cooling water from the normal temperature to the steam state is equal to the heat emitted by the flue gas, so that the temperature of the flue gas when the flue gas is discharged from the cooling outlet of the evaporative cooler is inversely related to the opening degree of the cooling water valve, and the linear function relation between the opening degree (w) and the temperature (t) of the flue gas is met.

Further, the at least three preset opening degrees w₁、w₂、w₃In order to increase or decrease the sequence, the phase difference Δ w between the two adjacent preset opening degrees is equal.

Further, the target opening w in the correction module₀The single correction amount of the temperature sensor is between 0.1% and 2%, and the temperature sensor is corrected for a plurality of times until the actual temperature t of the flue gas at the cooling outlet of the evaporative cooler_SEqual to the set temperature t of the flue gas₀。

Drawings

FIG. 1 is a schematic configuration diagram of a water amount adjusting system in a specific embodiment 1 of the method for adjusting the water amount of an evaporative cooler for dry dedusting according to the present invention;

FIG. 2 is a step chart of a water amount adjusting method in embodiment 1 of the water amount adjusting method of an evaporative cooler for dry dusting according to the present invention;

fig. 3 is a schematic view of a linear function image of the opening degree (w) and the flue gas temperature (t) in the embodiment 1 of the method for adjusting the water amount of the evaporative cooler for dry dedusting in accordance with the present invention.

In fig. 1: 1-an evaporative cooler, 10-a flue gas inlet, 11-a cooling outlet, 12-a cooling water pipeline, 120-a cooling water valve, 2-a temperature measuring module, 3-a simulation module and 4-a correction module.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In embodiment 1 of the method for adjusting the water amount of the evaporative cooler for dry dedusting according to the present invention, as shown in fig. 1 to 2, the method for adjusting the water amount of the evaporative cooler for dry dedusting is to adjust the opening degree of a cooling water valve 120 of the evaporative cooler 1, to allow high-temperature flue gas to enter the evaporative cooler 1 from a flue gas inlet 10, to exchange heat with cooling water, and to be discharged through a cooling outlet 11, and to balance the supply amount of the cooling water with the water consumption for cooling the flue gas, so as to control the actual temperature t of the flue gas at the cooling outlet 11 of the evaporative cooler 1_SMeet the set temperature t of the flue gas₀The method comprises the following steps:

step one, determining the set temperature t of the flue gas of the cooling outlet 11 of the evaporative cooler 1₀Selecting at least three preset opening degrees w₁、w₂、w₃(ii) a In the present embodiment, the flue gas setting temperature t of the cooling outlet 11 of the evaporative cooler 1₀At 200 ℃ t₀At 200 ℃, the smoke can not burn out a subsequent electrostatic dust collector, and the water vapor in the smoke can not be condensed into water mist. In other embodiments, the flue gas at the cooling outlet of the evaporative cooler is given a set temperature t in order to be able to adapt to the actual usage requirements₀Can be 150 ℃ or 250 ℃; or the set temperature t of the flue gas at the cooling outlet of the evaporative cooler 1₀At any temperature between 150 ℃ and 250 ℃.

In order to ensure the accuracy of the simulation result, in the step one, five preset opening degrees are selected, and are respectively the first preset opening degree w₁Second preset opening degree w₂A third preset opening degree w₃Fourth preset opening degree w₄And a fifth preset opening degree w₅And five preset opening degrees w₁、w₂、w₃、w₄And w₅Is an incremental sequence; the phase difference delta w between two adjacent preset opening degrees is equal to 10%; utensil for cleaning buttockThe body is a first preset opening degree w₁Is 20 percent and a second preset opening degree w₂30 percent and a third preset opening degree w₃Is 40 percent and a fourth preset opening degree w₄Is 50 percent and a fifth preset opening degree w₅The content was 60%.

Step two, according to the first preset opening degree w₁Second preset opening degree w₂A third preset opening degree w₃Fourth preset opening degree w₄Fifth preset opening degree w₅Respectively controlling the cooling water valve 120 to supply water and measuring the corresponding preset temperature t of the flue gas at the cooling outlet 11 of the evaporative cooler 1₁、t₂、t₃、t₄、t₅(ii) a In the present embodiment, the temperature of the flue gas is measured by the temperature measuring module 2 arranged at the cooling outlet 11 of the evaporative cooler 1, wherein the first preset opening degree w₁20%, the corresponding first preset temperature t of the flue gas₁At 605 ℃; preset opening degree w₂30%, the corresponding second preset temperature t of the flue gas₂Is 470 ℃; preset opening degree w₃40%, corresponding third preset temperature t of flue gas₃Is 350 ℃; fourth preset opening degree w₄50%, the corresponding fourth preset temperature t of the flue gas₄Is 220 ℃; fifth preset opening degree w₅60%, corresponding to the preset temperature t of the fifth flue gas₅The temperature was 105 ℃. The numerical relationship between the preset opening and the preset temperature of the flue gas is as follows 1:

preset opening degree	20％	30％	40％	50％	60％
						Preset temperature of flue gas	605℃	470℃	350℃	220℃	105℃

TABLE 1

Step three, establishing a plane coordinate system of the opening degree (w) and the flue gas temperature (t), as shown in fig. 3, according to five preset opening degrees w₁、w₂、w₃、w₄、w₅And corresponding to preset temperature t of flue gas₁、t₂、t₃、t₄、t₅Determining five groups of preset points w₁－t₁、w₂－t₂、w₃－t₃、w₄－t₄、w₅－t₅(ii) a Drawing five groups of preset points w in a plane coordinate system of the opening degree w and the flue gas temperature t₁－t₁、w₂－t₂、w₃－t₃、w₄－t₄、w₅－t₅And then fitting a linear function image of the opening (w) and the flue gas temperature (t), wherein the linear function image is a straight line L with a negative slope.

In step three, five groups of preset points w₁－t₁、w₂－t₂、w₃－t₃、w₄－t₄、w₅－t₅On the primary function image or discretely distributed on both sides of the primary function image. Wherein the preset point w₃－t₃On a first order function image, a preset point w₁－t₁、w₂－t₂And a preset point w₄－t₄、w₅－t₅The discrete distribution is arranged at two sides of the first-order function image, and the factors are eliminated by fittingThe error caused by temperature measurement makes the functional relationship between the opening (w) and the flue gas temperature (t) more fit to the actual situation.

Then, selecting the corresponding smoke gas set temperature t in the linear function image₀When the temperature is 200 ℃, the corresponding target opening degree w₀(ii) a As shown in FIG. 3, the set temperature t of the flue gas₀Target opening degree w corresponding to 200 DEG C₀The content was 52%. Theoretically, the method comprises the following steps: the opening degree of the cooling water valve 120 determines the flow rate of the cooling water, and according to the heat calculation formula: q is cm Δ t, and the heat absorbed by the cooling water entering the evaporative cooler 1 in a unit time when the cooling water is heated from a normal temperature to a vapor state is positively correlated with the opening degree of the cooling water valve 120; the flow rate of the flue gas discharged from the cooling outlet 11 of the evaporative cooler 1 is constant, that is, the amount of the flue gas passing through per unit time is constant, and similarly, according to the heat calculation formula: when Q is cm Δ t, it can be seen that the temperature of the flue gas when the flue gas is discharged from the cooling outlet 11 of the evaporative cooler 1 is inversely related to the amount of heat emitted by the flue gas, and the amount of heat absorbed by the cooling water when the cooling water is heated from a normal temperature to a vapor state is equal to the amount of heat emitted by the flue gas, so that the temperature of the flue gas when the flue gas is discharged from the cooling outlet 11 of the evaporative cooler 1 is inversely related to the opening degree of the cooling water valve 120, and conforms to the linear function relationship between the opening degree (w) and the temperature (t) of.

Step four, according to the target opening degree w₀Controlling the cooling water valve 120 to supply water according to the actual temperature t of the flue gas as 52 percent_SWith set temperature t of flue gas₀Correcting the target opening w in the forward direction₀. Due to the actual temperature t of the flue gas at the cooling outlet 11_SThere is an inevitable deviation from the simulation result, and further correction processing is required according to the actual situation. In this embodiment, when the cooling water valve 120 is at the target opening w₀When 52% of water is supplied, the actual temperature t of the flue gas at the cooling outlet 11 is_SAt 215 ℃, the actual temperature t of the flue gas_SWith set temperature t of flue gas₀A deviation value of +15 ℃ exists, and the target opening w needs to be corrected in the positive direction₀I.e. to increase the target opening w₀So as to ensure the actual temperature t of the flue gas_SReach the set temperature t of the flue gas₀。

To avoid the actual temperature t of the flue gas caused by the excessive correction_SWith set temperature t of flue gas₀With negative deviation, target opening w₀Is 1%, namely the target opening w of the first correction₀53% target opening w of second correction₀54% of the third corrected target opening degree w₀At 55% …, the actual temperature t of the flue gas at the cooling outlet 11 of the evaporative cooler 1 is corrected several times_SEqual to the set temperature t of the flue gas₀. In the present embodiment, the target opening degree w according to the first correction₀Controlling the cooling water valve 120 to supply water according to the percentage of 53 percent, namely obtaining the actual temperature t of the flue gas at the cooling outlet 11_S＝t₀200 ℃ meets the actual cooling requirement of the flue gas.

In other embodiments, the target opening degree w₀The single correction amount of (2) is not limited to 1%, and the target opening w is set to be suitable for the actual demand₀The single correction of (a) may be any value between 0.1% and 2%, for example: when the actual temperature t of the flue gas_SWhen the absolute value of the deviation from the set temperature t0 of the flue gas is less than 10 ℃, the single correction amount is 0.5 percent to the target opening w₀Carrying out successive correction; when the actual temperature t of the flue gas_SWith set temperature t of flue gas₀When the absolute value of the deviation (f) is larger than 20 ℃, the target opening w0 is corrected successively with the single correction amount as 2%.

To more finely correct a target opening degree w of a cooling water valve 120₀At the corrected target opening degree w₀According to the actual temperature change delta t of the flue gas in unit time dT_SThe corrected temperature change rate v is determined as Δ t_SIf the corrected temperature change rate v is larger than or equal to 1 ℃/s, the single correction amount of the cooling water valve 120 is larger, and the single correction amount needs to be reversely adjusted to be smaller, for example: the single correction amount is 2 percent to the target opening w₀When the correction is carried out, if the measured change rate v of the correction temperature is 1.5 ℃/s & gt 1 ℃/s, the single correction amount is adjusted from 2% to 1% so as to ensure that the actual temperature t of the flue gas is_SIs adjusted smoothly; on the contrary, if the corrected temperature change rate v is less than 0.5 ℃/s, it indicates that the single correction amount of the cooling water valve 120 is small, and the single correction amount needs to be reversely increased.

The water quantity regulating system of the evaporative cooler 1 for dry dedusting comprises the evaporative cooler 1, a simulation module 3 and a correction module 4, wherein the evaporative cooler 1 is provided with a flue gas inlet 10 and a cooling outlet 11, the flue gas inlet 10 is provided with a cooling water pipeline 12 and a cooling water valve 120 connected in series with the cooling water pipeline 12; the cooling outlet 11 is provided with a temperature measuring module 2 for detecting the actual temperature of the flue gas at the cooling outlet 11 of the evaporative cooler 1, and the temperature measuring module 2 is a thermocouple.

The simulation module 3 is electrically connected with the cooling water valve 120 and the temperature measuring module 2, and the simulation module 2 is used for presetting the opening degree w₁、w₂、w₃、w₄、w₅And corresponding to preset temperature t of flue gas₁、t₂、t₃、t₄、t₅Fitting a linear function image of the opening degree (w) and the flue gas temperature (t) in a plane coordinate system of the opening degree (w) and the flue gas temperature (t), and selecting the corresponding flue gas set temperature t from the linear function image₀Target opening degree w₀(ii) a Wherein, five preset opening degrees w₁、w₂、w₃、w₄、w₅In order to increase the number sequence, the difference Δ w between two adjacent preset opening degrees is equal, and the difference Δ w between two adjacent preset opening degrees is 10%.

The correction module 4 is electrically connected with the cooling water valve 120 and the temperature measurement module 2, and the correction module 4 is used for measuring the actual temperature t of the flue gas_SWith set temperature t of flue gas₀Correcting the target opening w in the forward direction₀The single correction amount is 1%, and the correction is performed for multiple times until the actual temperature t of the flue gas at the cooling outlet 11 of the evaporative cooler 1_SEqual to the set temperature t of the flue gas₀. Wherein the target opening degree w is corrected₀According to the actual temperature change delta t of the flue gas in unit time dT_SThe corrected temperature change rate v is determined as Δ t_SIf v is more than or equal to 1 ℃/s, the single correction is reduced; if v is less than 0.5 ℃/s, the single correction amount is increased.

In order to adapt to different use requirements, in the first step, the selected preset opening is not limited to five, but three preset openings are selected, namely the first preset opening w₁Second preset opening degree w₂A third preset opening degree w₃Three preset opening degrees w₁、w₂、w₃For increasing the sequence, the difference Δ w between two adjacent preset opening degrees is equal to 20%, i.e. the first preset opening degree w₁25% of the second preset opening w ₂50% and a third preset opening degree w₃75 percent according to three preset opening degrees w₁、w₂、w₃Respectively controlling a cooling water valve to supply water, and measuring the corresponding preset flue gas temperature t of a cooling outlet of the evaporative cooler₁、t₂、t₃Similarly, a linear function image of the opening (w) and the flue gas temperature (t) and a final target opening w can be obtained₀. In other embodiments, the number of the preset opening degrees may also be four or more, and in addition, a plurality of the preset opening degrees w₁、w₂、w₃… may be a descending series, and the difference Δ w between two adjacent preset opening degrees may also be 5%, or the difference Δ w between two adjacent preset opening degrees may be any value between 5% and 10% or any value between 10% and 20%.

The specific embodiments of the water amount adjusting system of the evaporative cooler for dry dedusting according to the present invention are the same as the specific embodiments of the water amount adjusting system of the evaporative cooler for dry dedusting according to the specific embodiments of the water amount adjusting method of the evaporative cooler for dry dedusting according to the present invention, and are not described herein again.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.