CN216799367U - Automatic flow control system for slaked lime slurry for flue gas reaction tower - Google Patents
Automatic flow control system for slaked lime slurry for flue gas reaction tower Download PDFInfo
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- CN216799367U CN216799367U CN202122927022.0U CN202122927022U CN216799367U CN 216799367 U CN216799367 U CN 216799367U CN 202122927022 U CN202122927022 U CN 202122927022U CN 216799367 U CN216799367 U CN 216799367U
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Abstract
The utility model discloses a flow automatic control system of slaked lime slurry for a flue gas reaction towerA system, comprising: the device comprises a preparation unit, a conveying unit, a reaction tower and a control unit; the preparation unit is used for preparing slaked lime slurry and comprises a first detector for detecting the temperature and the density of the slaked lime slurry; the conveying unit is used for conveying the slaked lime slurry to the reaction tower and comprises a first detection assembly used for metering and adjusting the flow of the slaked lime slurry entering the flue gas reaction tower; the reaction tower is used for realizing the reaction of slaked lime slurry and flue gas, and comprises a flue gas inlet end and a flue gas outlet end, wherein the flue gas inlet end and the flue gas outlet end are respectively provided with a device for detecting HCl and SO in the flue gas2A second detection component of concentration; the control unit is used for receiving the detection data signal, calculating and judging and then sending out a control signal so as to control the spraying amount of the slaked lime slurry entering the reaction tower. The method has the advantages of simplicity in operation, high real-time performance, high control accuracy and the like.
Description
Technical Field
The utility model belongs to the technical field of waste incineration flue gas purification treatment, and particularly relates to a slaked lime slurry flow automatic control system for a flue gas reaction tower.
Background
With the continuous acceleration of the urbanization process, the living standard of people is continuously improved, and the yield of domestic garbage is increased day by day. The current garbage cleaning and burning treatment is a main garbage harmless treatment mode all over the world, so that the land occupation condition caused by garbage landfill can be reduced, the heat generated by garbage burning can be utilized to generate electricity, and the garbage is changed into 'misplaced resources'. Among them, the emission of the waste incineration plant smoke reaching the standard is the key point of the environmental protection requirement, and the semidry deacidification is the common way of controlling the content of acid gas in the incineration smoke. The semidry deacidification method is mainly characterized in that slaked lime slurry with a certain concentration is prepared by a slaked lime slurry preparation system and is conveyed to a rotary sprayer of a reaction tower for atomization, and the slaked lime slurry reacts with acid gas in original flue gas in the tower, so that flue gas deacidification is realized.
Because the domestic garbage has various sources and complex components and is influenced by the domestic garbage, the fluctuation of the generation amount of the acid gas in the original smoke is large, and the concentration of the slaked lime slurry also needs to be adjusted accordingly. The conventional manual operation adjustment is carried out by operators, and the defects are mainly shown as follows:
(1) the manual operation of operators is slow in adjusting feedback, so that the increase of the content of the acidic gas in the flue gas cannot be found in time to adjust the flow of the slaked lime slurry after the feedback delay is caused.
(2) The manual regulation control is coarse, and the flow size is adjusted according to experience to the operating personnel, and the adjustment range is big, easily causes the waste of lime hydrate, and can't guarantee the gas temperature simultaneously.
Furthermore, the prior art regarding flow control of slaked lime slurry includes: a feedforward control method for a flue gas deacidification reaction tower of a garbage incinerator (CN 110652845A) has the following defects: (1) in the actual operation process, the actual preparation concentration of the slaked lime slurry has an error with the given concentration of the slaked lime slurry, the flow rate is controlled according to the given concentration and has an error with the actually required flow rate, and the concentration of the slaked lime slurry prepared cannot be adjusted in real time according to the actual requirement. (2) The garbage composition is complex, the content fluctuation of the generated flue gas acid gas is large, the flow of the slaked lime slurry entering the reaction tower is controlled according to the content of the acid gas in the flue gas at the outlet of the reaction tower, the feedback regulation fluctuation is large, and the control on the acid gas is not ideal.
The method also comprises a control method for the spraying amount of the lime slurry used in the flue gas treatment reaction tower (CN 104122906B, a utility model patent, granted), and has the following defects: (1) all the set values of the conditions are set according to various indexes of the flue gas at the outlet of the reaction tower, and the content of the acidic gas in the flue gas at the outlet of the reaction tower cannot be ensured in real time after the feedback delay. (2) The actual concentration condition of the used lime slurry is not considered, only the flow is controlled, and the control is not accurate enough.
It can be seen that the existing related prior art mainly adopts feedback regulation or feedforward control of flow rate according to the content of acid gas in flue gas at the outlet of a reaction tower under the given concentration of slaked lime slurry by using an empirical function between furnace temperature and combustion air quantity and lime slurry flow rate, and has certain defects:
(1) the garbage composition is complex, the content fluctuation of the generated flue gas acid gas is large, the flow of the slaked lime slurry entering the reaction tower is controlled according to the content of the acid gas in the flue gas at the outlet of the reaction tower, the feedback regulation fluctuation is large, and the control on the acid gas is not ideal.
(2) In the actual operation process, the actual preparation concentration of the slaked lime slurry has an error with the given concentration of the slaked lime slurry, the flow rate is controlled according to the given concentration and has an error with the actually required flow rate, and the concentration of the slaked lime slurry prepared cannot be adjusted in real time according to the actual requirement.
That is, at present, the waste incineration flue gas reaction tower has no mature and targeted automatic slaked lime slurry flow control system and method.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problems that in the prior art, the flow of slaked lime slurry at the inlet of a reaction tower is fed back and controlled by acid gas at the outlet of the reaction tower, so that the feedback is delayed, the acid gas is not controlled in time, or the flow is controlled by giving the concentration of the slaked lime slurry instead of a real-time concentration value without considering the concentration of the slaked lime slurry, so that the control is not accurate enough, and provides an automatic slaked lime slurry flow control system for a flue gas reaction tower, which has the advantages of compact structure, simplicity in operation, high real-time property and high control accuracy.
In order to solve the technical problems, the utility model adopts the following technical scheme:
an automatic flow control system for slaked lime slurry used for a flue gas reaction tower comprises: the device comprises a preparation unit, a conveying unit, a flue gas reaction tower and a control unit;
the preparation unit is used for preparing slaked lime slurry, a first detector for detecting the temperature and the density of the slaked lime slurry is arranged on the preparation unit, and the first detector is electrically connected with the central controller;
the conveying unit is used for conveying the slaked lime slurry in the preparation unit to the flue gas reaction tower, the conveying unit comprises a first detection assembly used for metering and adjusting the flow of the slaked lime slurry entering the flue gas reaction tower, and the first detection assembly is electrically connected with the control unit;
the flue gas reaction tower is used for realizing the reaction of slaked lime slurry and flue gas, the flue gas reaction tower comprises a flue gas inlet end and a flue gas outlet end, and HCl and SO in the flue gas are detected on the flue gas inlet end and the flue gas outlet end2The second detection assembly of concentration, the said second detection assembly is connected with control unit electrically;
the control unit is used for receiving various detection data signals, calculating and judging the detection data signals, and then sending out control instruction signals so as to control the spraying amount of the slaked lime slurry entering the flue gas reaction tower in real time.
As a further improvement of the utility model, the flue gas inlet end is further provided with a third flowmeter and a thermometer which are electrically connected with the control unit, and the third flowmeter and the thermometer are respectively used for detecting the flow and the temperature of the raw flue gas entering the flue gas reaction tower and transmitting a detection data signal to the control unit in real time.
As a further improvement of the utility model, the preparation unit comprises a preparation tank for preparing slaked lime slurry, the first detector is arranged on the preparation tank, the preparation tank is also provided with a first feeding end and a second feeding end for realizing feeding of industrial water and slaked lime, and the bottom of the preparation tank is connected with the conveying unit.
As a further improvement of the utility model, a first regulating valve and a first flow meter are arranged between the first feeding end and the preparation tank, and the first regulating valve and the first flow meter are both electrically connected with a control unit and are used for realizing the feeding control of the industrial water.
As a further improvement of the utility model, a metering component is arranged between the second feeding end and the preparation tank, the metering component is used for realizing weighing and metering of the slaked lime, and the metering component is electrically connected with the control unit.
As a further improvement of the utility model, the metering component is a weighing feeder.
As a further improvement of the utility model, the conveying unit comprises a conveying pump, and the conveying pump is used for conveying the slaked lime slurry in the preparation tank to the flue gas reaction tower; the first detection assembly comprises a second regulating valve and a second flow meter, and the second regulating valve and the second flow meter are electrically connected with the control unit and are used for controlling the spraying amount of the slaked lime slurry.
As a further improvement of the utility model, the top of the flue gas reaction tower is provided with an atomizer, and the discharge end of the delivery pump is connected with the atomizer.
As a further improvement of the present invention, the second detection assembly includes a second detector, a third detector, a fourth detector and a fifth detector; the second and third detecting positionsAt the flue gas inlet end, the device is respectively used for detecting HCl and SO in the original flue gas2The concentration of (c); the fourth detector and the fifth detector are positioned at the flue gas outlet end and are respectively used for detecting HCl and SO in the purified flue gas2The concentration of (c).
As a further development of the utility model, the control unit comprises a PLC controller.
Compared with the prior art, the utility model has the advantages that:
according to the automatic flow control system for the slaked lime slurry used for the flue gas reaction tower, the temperature and the density of the slaked lime slurry prepared by the preparation unit can be detected in real time through the first detector, the detection data signals are transmitted to the control unit in real time, and the control unit sends out control signals to adjust the concentration of the slaked lime slurry after calculation and judgment; the flow rate and the temperature of the raw flue gas at the flue gas inlet end of the flue gas reaction tower and HCl and SO in the raw flue gas are detected in real time by a third flowmeter, a thermometer, a second detector and a third detector2The control unit calculates according to the received data signal and in combination with the concentration of the slaked lime slurry, and sends a control signal to the conveying unit so as to control the flow of the slaked lime slurry entering the flue gas reaction tower. The method is simple and convenient to operate, the concentration of the slaked lime slurry can be measured in real time, and the flow of the slaked lime slurry entering the flue gas reaction tower is subjected to feedforward adjustment by combining the condition of the flue gas at the inlet of the flue gas reaction tower; meanwhile, the concentration of the slaked lime slurry can be fed back and adjusted according to the real-time flue gas treatment condition. The method realizes the accurate control of the flow of the offset lime slurry, avoids resource waste, achieves the optimal effect on the control of the acid gas in the waste incineration flue gas, and realizes the discharge of the acid gas reaching the standard and reaching the optimal level.
Drawings
Fig. 1 is a schematic structural principle diagram of an automatic flow control system of slaked lime slurry for a flue gas reaction tower of the utility model.
FIG. 2 is a schematic flow chart of the method for automatically controlling the flow of slaked lime slurry in the waste incineration flue gas reaction tower.
Illustration of the drawings:
1. preparing a tank; 11. a first feed end; 12. a first regulating valve; 13. a first flow meter; 14. a second feed end; 15. a metering assembly; 2. a first detector; 3. a delivery pump; 31. an inlet duct; 32. an outlet conduit; 33. a second regulating valve; 34. a second flow meter; 4. a flue gas reaction tower; 41. a flue gas inlet end; 42. a third flow meter; 43. a thermometer; 44. a second detector; 45. a third detector; 46. a fourth detector; 47. a fifth detector; 48. a flue gas outlet end; 49. an atomizer.
Detailed Description
The utility model is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the utility model.
Example 1
As shown in fig. 1, the automatic flow control system of slaked lime slurry for flue gas reaction tower of the present invention comprises: a preparation unit, a conveying unit, a flue gas reaction tower 4 and a control unit.
The preparation unit is used for preparing slaked lime slurry, and the preparation unit is provided with a first detector 2 for detecting the temperature and the density of the slaked lime slurry. The first detector 2 is electrically connected with the central controller and transmits the detection data signals to the control unit in real time. Further, the central controller calculates the concentration of the slaked lime slurry according to the temperature and the density of the slaked lime slurry fed back by the first detector 2 in real time.
The conveying unit is used for conveying the slaked lime slurry in the preparation unit to the flue gas reaction tower 4, and the conveying unit comprises a first detection assembly used for metering and adjusting the flow of the slaked lime slurry entering the flue gas reaction tower 4. The first detection assembly is electrically connected with the control unit, transmits the detection data signal to the control unit in real time, and receives a control instruction signal sent by the control unit.
The flue gas reaction tower 4 is used for realizing contact reaction of slaked lime slurry and flue gas and realizing flue gas deacidification. The flue gas reaction tower 4 comprises a flue gas inlet end 41 and a flue gas outlet end 48, wherein the flue gas inlet end 41 and the flue gas outlet end 48 are respectively provided with a device for detecting HCl and SO in flue gas2Second detection component for contentThe second detection component is connected with the control unit and transmits the detection data signal to the control unit in real time. It can be understood that in this embodiment, the flue gas inlet end 41 and the flue gas outlet end 48 are respectively located at two side portions of the flue gas reaction tower 4, and the raw flue gas to be treated and the slaked lime slurry are contacted and reacted in the flue gas reaction tower 4 to perform flue gas deacidification treatment. Further, an atomizer 49 is arranged at the top of the inner side of the flue gas reaction tower 4, and the slaked lime slurry is sprayed into the flue gas reaction tower 4 through the atomizer 49 to contact and react with the raw flue gas.
The control unit (not shown in the figure) is used for receiving various detection data signals, calculating and judging the detection data signals, and then sending out control instruction signals to control the flow of the slaked lime slurry entering the flue gas reaction tower 4 in real time. It can be understood that in order to improve the control accuracy, the control unit can select the PLC controller for use, and the PLC controller has the advantages of high reliability, strong anti-interference capability, perfect functions, strong applicability, convenient maintenance and the like.
In this embodiment, the flue gas inlet end 41 is further provided with a third flow meter 42 and a thermometer 43 electrically connected to the control unit, and the third flow meter 42 and the thermometer 43 are respectively used for detecting the flow rate and the temperature of the raw flue gas entering the flue gas reaction tower 4 in real time and transmitting a detection data signal to the control unit in real time.
In this embodiment, the second detecting component includes a second detector 44, a third detector 45, a fourth detector 46, and a fifth detector 47. The second detector 44 and the third detector 45 are located at the flue gas inlet end 41 and are respectively used for detecting HCl and SO in the raw flue gas in real time2And transmitting the detection data signal to the control unit in real time. The fourth detector 46 and the fifth detector 47 are located at the flue gas outlet end 48, and are respectively used for detecting HCl and SO in the purified flue gas in real time2And transmits the detection data signal to the control unit in real time to judge whether the concentration of the acid gas in the flue gas discharged from the flue gas reaction tower 4 reaches the standard or not. By arranging the acid gas concentration detection equipment at the flue gas inlet end 41 and the flue gas outlet end 48, on one hand, the content of acid components in the original flue gas to be treated can be fed back to the control unit, so that the control unit can make accurate calculation and judgment, and the spraying of lime slaking slurry is improvedThe control precision of the amount realizes the high-efficiency deacidification of the flue gas; on the other hand, the flue gas condition after the deacidification treatment can be obtained in real time, and the spraying amount of the slaked lime slurry is adjusted in real time according to the flue gas purification treatment effect, so that the consumption of the slaked lime slurry is saved, the condition that the flue gas treatment does not reach the standard is avoided, and the secondary pollution is avoided.
In the embodiment, the preparation unit comprises a preparation tank 1 for preparing slaked lime slurry, the first detector 2 is arranged on the side of the preparation tank 1, the preparation tank 1 is further provided with a first feeding end 11 and a second feeding end 14 for feeding industrial water and slaked lime, and the bottom of the preparation tank 1 is connected with the conveying unit. Further, a stirring component is arranged in the preparation tank 1, and industrial water and slaked lime entering the preparation tank are stirred by the stirring component, so that the uniform concentration and density of the obtained slaked lime slurry are ensured.
In this embodiment, a first regulating valve 12 and a first flow meter 13 are provided between the first feeding end 11 and the preparation tank 1. The first regulating valve 12 and the first flowmeter 13 are both electrically connected with the control unit and transmit the detection data signals to the control unit in real time, and the first regulating valve 12 also receives control instruction signals sent by the control unit at the same time so as to realize the feeding control of the industrial water. The inlet water of the industrial water is regulated and metered through the first regulating valve 12 and the first flow meter 13, so that the working efficiency of lime hydrate slurry preparation is improved.
In this embodiment, a metering assembly 15 is arranged between the second feeding end 14 and the preparation tank 1, the metering assembly 15 is used for weighing and metering the slaked lime, and the metering assembly 15 is electrically connected with the control unit. Further, in order to improve the control accuracy of the feeding amount of the slaked lime, the weighing feeder can be selected for the metering component 15, and the metering component has the advantages of being accurate in metering and simple to control. When the slaked lime slurry is prepared, the control unit respectively sends corresponding industrial water inflow control instruction signals and slaked lime feeding amount control instruction signals to the first regulating valve 12 and the metering component 15 according to the preset slaked lime slurry concentration. The first regulator valve 12 and the metering assembly 15 will also feed real-time sensed data back to the control unit. After the preparation is finished, the first detector 2 feeds back the detected actual concentration of the slaked lime slurry in the preparation tank 1 to the control unit, and the control unit compares and judges the actual concentration of the slaked lime slurry with the preset concentration. If the difference value between the actual concentration and the preset concentration accords with the error range, sending a control instruction signal to a transmission unit; and if the difference value between the actual concentration and the preset concentration exceeds the error range, sending a corresponding control instruction to the first regulating valve 12 or the metering component 15, and continuously preparing the slaked lime slurry until the difference value between the actual concentration and the preset concentration of the slaked lime slurry is controlled within the error range.
In this embodiment, the conveying unit comprises a conveying pump 3, and the conveying pump 3 is used for conveying the slaked lime slurry in the preparation tank 1 to the flue gas reaction tower 4. Further, the feeding end of the delivery pump 3 is connected with the bottom of the preparation tank 1 through a feeding pipeline 31, and the discharging end of the delivery pump 3 is connected with an atomizer 49 arranged on the inner side of the top of the flue gas reaction tower 4 through an outlet pipeline 32.
In this embodiment, the first detecting assembly includes a second regulating valve 33 and a second flow meter 34, both the second regulating valve 33 and the second flow meter 34 are disposed on the outlet pipe 32, and are electrically connected to the control unit, so as to transmit the detected real-time data signal to the control unit, and at the same time, the second flow regulating valve 33 receives the control command signal sent by the control unit, so as to control the spraying flow rate of the slaked lime slurry. The second regulating valve 33 and the second flow meter 34 are arranged on the outlet pipeline 32, so that the spraying flow of the slaked lime slurry entering the flue gas reaction tower 4 is regulated and metered, the raw flue gas can be ensured to be fully deacidified, and the waste of the slaked lime slurry can be avoided.
In this embodiment, the first detector 2 can detect the concentration of the slaked lime slurry prepared in the preparation tank 1 in real time, and transmit the detection data signal to the control unit in real time, and the control unit calculates and judges the detection data signal and then sends out a control signal to adjust the concentration of the slaked lime slurry. The third flowmeter 42, the thermometer 43, the second detector 44 and the third detector 45 detect the flow rate and the temperature of the raw flue gas at the flue gas inlet end 41 of the flue gas reaction tower 4, and the HCl and SO in the raw flue gas in real time2And transmitting the detection data signal to the control unit in real time, the control unit transmitting the detection data signal to the control unit according to the received data signalAnd the concentration of the slaked lime slurry is combined for calculation, and a control signal is sent to the conveying unit to control the flow of the slaked lime slurry entering the flue gas reaction tower 4. The method is simple and convenient to operate, the concentration of the slaked lime slurry can be measured in real time, and the flow of the slaked lime slurry entering the flue gas reaction tower 4 is subjected to feedforward adjustment by combining the condition of the original flue gas at the flue gas inlet of the flue gas reaction tower 4; meanwhile, the concentration of the slaked lime slurry can be fed back and adjusted according to the real-time flue gas treatment condition. The method realizes the accurate control of the flow of the offset lime slurry, avoids resource waste, achieves the optimal effect on the control of the acid gas in the waste incineration flue gas, and realizes the discharge of the acid gas reaching the standard and reaching the optimal level.
Example 2
As shown in fig. 2, the method for automatically controlling the flow of slaked lime slurry in a flue gas reaction tower for waste incineration of the utility model is implemented by using the automatic control system, and comprises the following steps:
s1, the control unit enables the preset concentration omega of the slaked lime slurry0And sending the instruction to a preparation unit, and preparing slaked lime slurry by the preparation unit according to the received instruction.
S2, the control unit obtains the actual concentration omega of the lime hydrate slurry in the preparation unit in real time1And density ρ1And the raw flue gas flow Q at the flue gas inlet end0Temperature T of raw flue gas and concentration C of HCl in raw flue gas1And SO2Concentration C of2。
S3 actual concentration omega of slaked lime slurry1With a predetermined concentration omega0Is greater than N1The control unit sends an instruction to the preparation unit to adjust the feeding amount of slaked lime and the incoming amount of industrial water.
S4 actual concentration omega of slaked lime slurry1With a predetermined concentration omega0Is less than or equal to N1The control unit calculates the flow Q of the slaked lime slurry delivered to the flue gas reaction tower 4 on the basis of the real-time data acquired in step S21And sends an instruction to the conveying unit, and the conveying unit conveys the slaked lime slurry into the flue gas reaction tower 4 according to the received instruction.
S5, the control unit obtains the smoke outlet in real timeConcentration C of HCl in flue gas after end purification treatment3And SO2Concentration C of4And sending an instruction to a conveying unit according to the effect of the flue gas purification treatment so as to adjust the flow Q of the slaked lime slurry in real time1。
In this example, N1To an acceptable error, N1Is 2%. I.e. the actual concentration omega of the slaked lime slurry1With a predetermined concentration omega0If the absolute value of the difference value is within 2%, subsequent spraying operation can be carried out; if the actual concentration of the slaked lime slurry is omega1With a predetermined concentration omega0Is greater than 2%, the control unit sends a control command to the first regulating valve 12 or the metering assembly 15 to add industrial water or slaked lime to regulate the actual concentration ω of the slaked lime slurry1。
In step S4, the control unit calculates the flow Q of the slaked lime slurry sent to the flue gas reaction tower 4 according to the formula (1)1，
Q1=N2×T×（N3×Q0×C1+N4×Q0×C2）/（109ω1×ρ1）（1）
Wherein the coefficient N2Obtained by induction method. Coefficient N3And N4According to the chemical equation of the deacidification reaction. T is the original flue gas temperature at the flue gas inlet end, Q0Is the raw flue gas flow at the flue gas inlet end, C1Is the concentration of HCl in the raw flue gas at the flue gas inlet end, C2Is SO in raw flue gas at the flue gas inlet end2Concentration, density ρ1To prepare the slaked lime slurry density in the unit.
Further, according to the following chemical equations (1) and (2):
Ca(0H)2+SO2+1/2O2→CaSO4+H2O（1）
Ca(OH)2+2HCl→CaCl2+2H2O（2）
by utilizing the law of conservation of mass, if the concentration of the acid gas in the outlet flue gas is required to be 0, the coefficient N can be obtained3=1.29，N4=1.12。
Specifically, according to equations (1) and (2), Ca (OH)2With SO2The molar ratio of HCl reaction is 1:1 and 1:2 respectively, and the following relations exist according to the mass conservation law:
SO that the SO in the original flue gas is completely removed2HCl Ca (OH)2The mass is (mg/h)
Then present (m)3/h）
I.e. the coefficient N3=1.29，N4=1.12。
Wherein the default content of the effective calcium hydroxide in the slaked lime is 90 percent.
In this embodiment, the slaked lime slurry is prepared according to the preset slaked lime slurry concentration, the actual concentration of the slaked lime slurry is detected, and the slaked lime slurry is subjected to pre-treatmentAfter the concentration is compared with the actual concentration, the actual concentration omega of the slaked lime slurry obtained in real time is combined1And density ρ1Raw flue gas flow Q at flue gas inlet end0Temperature T of raw flue gas and concentration C of HCl in raw flue gas1And SO2Concentration C of2Calculating to obtain the flow Q of the slaked lime slurry conveyed to the flue gas reaction tower 41The flow of the slaked lime slurry is accurately controlled, the high-efficiency purification treatment of the waste incineration flue gas is realized, and the zero emission of acid components in the flue gas at the flue gas outlet end is realized. In addition, a signal can be fed back to the front end to adjust the preparation concentration of the slaked lime slurry in time, so that the preparation quality of the slaked lime slurry is improved, the reaction effect of the slaked lime slurry and the acid gas is further improved, and the quick purification of the waste incineration flue gas is realized.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the utility model, using the methods and techniques disclosed above. Therefore, any simple modifications, equivalent substitutions, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are within the scope of the technical scheme of the present invention.
Claims (10)
1. An automatic flow control system for slaked lime slurry used for a flue gas reaction tower is characterized by comprising: the device comprises a preparation unit, a conveying unit, a flue gas reaction tower (4) and a control unit;
the preparation unit is used for preparing slaked lime slurry, a first detector (2) for detecting the temperature and the density of the slaked lime slurry is arranged on the preparation unit, and the first detector (2) is electrically connected with the central controller;
the conveying unit is used for conveying the slaked lime slurry in the preparation unit to the flue gas reaction tower (4), the conveying unit comprises a first detection assembly used for metering and adjusting the flow of the slaked lime slurry entering the flue gas reaction tower (4), and the first detection assembly is electrically connected with the control unit;
the flue gas reaction tower (4) is used for realizing reaction of slaked lime slurry and flue gas, the flue gas reaction tower (4) comprises a flue gas inlet end (41) and a flue gas outlet end (48), and HCl and SO in the flue gas are detected through the flue gas inlet end (41) and the flue gas outlet end (48)2The second detection assembly of concentration, the said second detection assembly is connected with control unit electrically;
the control unit is used for receiving various detection data signals, calculating and judging the detection data signals, and then sending out control instruction signals to control the spraying amount of the slaked lime slurry entering the flue gas reaction tower (4) in real time.
2. The automatic flow control system for the slaked lime slurry used for the flue gas reaction tower according to claim 1, wherein the flue gas inlet end (41) is further provided with a third flow meter (42) and a temperature meter (43) which are electrically connected with the control unit, and the third flow meter (42) and the temperature meter (43) are respectively used for detecting the flow rate and the temperature of the raw flue gas entering the flue gas reaction tower (4) and transmitting a detection data signal to the control unit in real time.
3. The automatic flow control system of slaked lime slurry for flue gas reaction tower according to claim 2, wherein the preparation unit comprises a preparation tank (1) for preparing slaked lime slurry, the first detector (2) is arranged on the preparation tank (1), the preparation tank (1) is further provided with a first feeding end (11) and a second feeding end (14) for realizing industrial water and slaked lime feeding, and the bottom of the preparation tank (1) is connected with the conveying unit.
4. The automatic flow control system of the slaked lime slurry for the flue gas reaction tower according to claim 3, wherein a first regulating valve (12) and a first flow meter (13) are arranged between the first feeding end (11) and the preparation tank (1), and the first regulating valve (12) and the first flow meter (13) are both electrically connected with a control unit for realizing the feeding control of industrial water.
5. The automatic flow control system for slaked lime slurry for a flue gas reaction tower according to claim 3, wherein a metering assembly (15) is arranged between the second feed end (14) and the preparation tank (1), the metering assembly (15) is used for realizing weighing and metering of slaked lime, and the metering assembly (15) is electrically connected with the control unit.
6. The automatic flow control system of slaked lime slurry for flue gas reaction towers according to claim 5, characterised in that the metering assembly (15) is a weigh feeder.
7. The automatic flow control system of slaked lime slurry for flue gas reaction tower according to any one of claims 3 to 6, characterized in that the conveying unit comprises a conveying pump (3), the conveying pump (3) is used for conveying the slaked lime slurry in the preparation tank (1) to the flue gas reaction tower (4); the first detection assembly comprises a second regulating valve (33) and a second flow meter (34), and the second regulating valve (33) and the second flow meter (34) are electrically connected with the control unit and used for controlling the spraying amount of the slaked lime slurry.
8. The automatic flow control system of slaked lime slurry for flue gas reaction tower according to claim 7, characterized in that an atomizer (49) is arranged on the top of the flue gas reaction tower (4), and the discharge end of the delivery pump (3) is connected with the atomizer (49).
9. The automatic flow control system of slaked lime slurry for flue gas reaction tower according to any one of claims 1 to 6, wherein the second detection assembly comprises a second detector (44), a third detector (45), a fourth detector (46) and a fifth detector (47); the second detector (44) and the third detector (45) are positioned at the flue gas inlet end (41) and are respectively used for detecting HCl and SO in the original flue gas2The concentration of (c); the fourth detector (46) and the fifth detector (47) are positioned at the flue gas outlet end (48) and are respectively used for detecting HCl and SO in the purified flue gas2The concentration of (c).
10. The automatic flow control system of slaked lime slurry for flue gas reaction tower according to any one of claims 1 to 6, wherein the control unit comprises a PLC controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122927022.0U CN216799367U (en) | 2021-11-25 | 2021-11-25 | Automatic flow control system for slaked lime slurry for flue gas reaction tower |
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