CN211799904U - Intelligent acid adding device for continuous smoke emission cold-dry pretreatment - Google Patents
Intelligent acid adding device for continuous smoke emission cold-dry pretreatment Download PDFInfo
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- CN211799904U CN211799904U CN201922300968.7U CN201922300968U CN211799904U CN 211799904 U CN211799904 U CN 211799904U CN 201922300968 U CN201922300968 U CN 201922300968U CN 211799904 U CN211799904 U CN 211799904U
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- peristaltic pump
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Abstract
The utility model discloses a cold dry process preliminary treatment intelligence acidification device of continuous emission of flue gas, it relates to environmental protection monitoring technology field. One end of the heat tracing sampling pipeline is a flue gas inlet, an air pump is installed on the pipeline connected with the heat tracing sampling pipeline, the other end of the heat tracing sampling pipeline is connected with one end of a three-way joint, the other end of the three-way joint is connected with the outlet end of an acid adding peristaltic pump, the inlet end of the acid adding peristaltic pump is connected with an acid liquid storage tank, the third port of the three-way joint is connected with the air inlet end of a condenser, the air outlet end of the condenser is connected with an air outlet pipe, the outlet of the condenser is connected with a condensate discharging peristaltic pump, and the acid adding peristaltic pump is connected with an upper computer controller. The utility model discloses effectively reduce the gaseous component loss rate of system preliminary treatment, effectual control adds the acid yield in order to reach economic utilization simultaneously, avoids extravagant, reduces the secondary pollution to the environment, and application prospect is wide.
Description
Technical Field
The utility model relates to an environmental protection monitoring technology field, concretely relates to cold dry process preliminary treatment intelligence acidification device of continuous emission of flue gas.
Background
The flue gas contains a large amount of acid gases, such as SO2、NO、NO2And the like, the acid gases are easily dissolved in water, and when the flue gas is dehumidified by the pretreatment condenser, the acid gases are dissolved in the water and are discharged and condensed together, SO is generated2、NO、NO2Waiting for the loss of gas constituents to result in inaccurate measurement of the final smoke constituents. Therefore, the accuracy of the smoke component detection does not depend on the performance of the instrument, the phenomenon that gas dissolves in water in the smoke pretreatment dehumidification process can directly influence the accuracy of parameter measurement, once the loss rate is too high, the gas concentration measurement value is lower than the actual value, even the concentration value cannot be detected, the method brings great misleading to the monitoring and comparison work of an environmental monitoring department, and the law enforcement effect of smoke emission monitoring is further lost.
Therefore, for the pretreatment of the cold-dry CEMS monitoring system, in order to achieve dehumidification and keep the components of the flue gas from losing as much as possible, the most common method is to add acid (phosphoric acid) at the air inlet end of a condenser, so that flue gas condensate water is saturated by adding acid and does not absorb and dissolve acidic components of the flue gas any more, and thus the effect of not losing the components of the flue gas can be achieved. When the flow is unchanged, the acid adding amount is larger when the humidity is larger, and the acid adding amount is smaller when the humidity is smaller; when the humidity is not changed, the water accumulation amount of the condenser corresponding to the large flow is large, and the acid addition amount is also large. In practice, however, the acid adding amount is adjusted by the rotating speed of the peristaltic pump, and the rotating speed of the peristaltic pump is fixed, so that the acid adding amount is not changed and cannot be changed along with the humidity and the flow of the flue gas. The working conditions are different, and the humidity and the flow are also different, so that the acid adding amount is relatively small and the effect cannot be achieved under certain working conditions; or even though the effect is achieved by adding a large amount of acid, the secondary pollution to the environment can be caused by the condensation discharge, the acid liquor can be wasted, and the method is not economical for users.
Practical research shows that the amount of acid added mainly depends on the exhaust flow and the flue gas humidity of the CEMS pretreatment, the flue gas humidity and flow under different working conditions are different, and the required amount of acid added is also different. Based on this, it is especially important to design an intelligent acid adding device according to the actual CEMS exhaust flow and the flue gas humidity.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
An object of the utility model is to provide a flue gas continuous emission cold dry process preliminary treatment intelligence acidification device to solve the gas component that proposes in the above-mentioned background art and lose the problem that the rate is high, extravagant acidizing fluid, polluted environment, economic nature are poor.
(II) technical scheme
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a continuous cold dry process preliminary treatment intelligence acidification device that discharges of flue gas, including heat tracing sampling pipeline, acidizing fluid storage tank, acidification peristaltic pump, three way connection, condenser, outlet duct, the peristaltic pump of arranging and host computer controller, the one end of heat tracing sampling pipeline is flue gas inlet, install the aspiration pump on the pipeline of heat tracing sampling pipeline connection, the other end of heat tracing sampling pipeline links to each other with three way connection's one end, three way connection's the other end is connected with acidification peristaltic pump's outlet end, acidification peristaltic pump's inlet end is connected with the acidizing fluid storage tank, three port of three way connection links to each other with the inlet end of condenser, the outlet end of condenser is connected with the outlet duct, the export of condenser links to each other with the peristaltic pump of arranging and congealing, acidification peristaltic pump be connected with the host computer controller.
The utility model discloses a fuzzy control algorithm gives acidification peristaltic pump drive signal and adjusts the rotational speed and change the acidification volume, adopts flue gas humidity value hi (Vol%) and flue gas flow Q (L/min) as fuzzy control algorithm input variable to accessible CEMS host computer itself acquires, through acidification volume, flue gas humidity value, sample flow and SO2The algorithm for controlling the acidification is obtained by the actual experience of the component loss rate, and the flue gas humidity, the sampling flow and the SO can be obtained2The component loss rate condition is integrated into the fuzzy control by a mathematical language form, and the acid adding signal is judged and output by an empirical rule to replace manual operation, so that the acid adding form is intelligent.
Preferably, the acid adding peristaltic pump is an adjustable speed peristaltic pump, only a rotating speed signal is required to be given, and a driving signal of the acid adding peristaltic pump is output through fuzzy rule judgment according to the humidity value and the flow value, so that the rotating speed of the acid adding peristaltic pump is adjusted, and the purpose of adjusting the acid adding amount is achieved. The relation between the driving signal, the humidity value and the flow in the fuzzy control algorithm is obtained through practical experience and theoretical analysis, and the relation between the driving signal and the rotating speed of the acid adding peristaltic pump 3 is determined by the peristaltic pump driving.
(III) advantageous effects
Compared with the prior art, after the technical scheme is adopted, the utility model discloses beneficial effect does:
the device utilizes the relation factors of the CEMS flue gas sample gas flow and the flue gas humidity value and the rotation speed of the acidification peristaltic pump, adopts a fuzzy control algorithm, a direct current motor drive control technology and an upper computer to carry out flue gas pretreatment intelligent acidification operation, effectively reduces the loss rate of pretreated gas components of the CEMS system, effectively controls the acidification amount to achieve economic utilization, effectively utilizes acid liquor, avoids waste, reduces secondary pollution to the environment, and has wide application prospect.
Drawings
Fig. 1 is a functional structure diagram of the present invention;
fig. 2 is a control schematic diagram of a fuzzy controller for controlling the acid-adding peristaltic pump according to the present invention.
Description of reference numerals:
1. a heat tracing sampling line; 2. an acid liquor storage tank; 3. adding an acid peristaltic pump; 4. a three-way joint; 5. a condenser; 6. an air outlet pipe; 7. a discharge and condensation peristaltic pump; 8. an upper computer controller; FLC, fuzzy controller.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides an embodiment: the utility model provides a continuous emission cold-dry process preliminary treatment intelligence acidification device of flue gas, including heat tracing sampling pipeline 1, acidizing fluid storage tank 2, acidification peristaltic pump 3, three way connection 4, condenser 5, outlet duct 6, arrange and congeal peristaltic pump 7 and host computer controller 8, the one end of heat tracing sampling pipeline 1 is the flue gas inlet, install the aspiration pump on the pipeline that heat tracing sampling pipeline 1 connects, the other end of heat tracing sampling pipeline 1 links to each other with three way connection 4's one end, three way connection 4's the other end is connected with acidification peristaltic pump 3's exit end, acidification peristaltic pump 3's entrance point is connected with acidizing fluid storage tank 2, three port of three way connection 4 links to each other with condenser 5's inlet end, condenser 5's the end of giving vent to anger is connected with outlet duct 6, condenser 5's export links to each other with drainage and congeals peristaltic pump 7, acidification peristaltic pump 3 be connected with host.
The specific embodiment adopts a fuzzy control algorithm to give a driving signal of the acid-adding peristaltic pump to adjust the rotating speed and change the acid-adding amount, adopts the smoke humidity value hi (Vol%) and the smoke flow Q (L/min) as input variables of the fuzzy control algorithm, can be obtained by a CEMS (central office automation system) upper computer and adopts the acid-adding amount, the smoke humidity value, the sampling flow and SO (SO) as well as the acid-adding amount2The algorithm for controlling the acidification is obtained by the actual experience of the component loss rate, and the flue gas humidity, the sampling flow and the SO can be obtained2The component loss rate condition is integrated into the fuzzy control by a mathematical language form, and the acid adding signal is judged and output by an empirical rule to replace manual operation, so that the acid adding form is intelligent.
It is worth noting that the acidification peristaltic pump 3 is an adjustable speed peristaltic pump, only a rotating speed signal is required to be given, and a driving signal of the acidification peristaltic pump is output through the fuzzy rule judgment of the humidity value and the flow value, so that the rotating speed of the acidification peristaltic pump is adjusted, and the purpose of adjusting the acidification amount is achieved. The relation between the driving signal, the humidity value and the flow in the fuzzy control algorithm is obtained through practical experience and theoretical analysis, and the relation between the driving signal and the rotating speed of the acid adding peristaltic pump 3 is determined by the peristaltic pump driving.
The specific design concept of the fuzzy controller (fig. 2) of this embodiment is as follows:
(1) input and output discourse domain
Humidity value h of flue gasi(Vol%) and flow value Qi(L/min) as input variable for the fuzzy controller FLC, where hiThe variation range of (A) can be [0, 40 ] according to the general working condition]Its discourse domain may be [0, 2](ii) a Flue gas flow rate QiHas a variation range of [0, 5 ]]Its discourse domain may be [0, 2](ii) a The output variable u' control range domain may be set to 0, 4]。
Input variable hiIs taken as [ NB, NS, 0, PS, PB ]]Corresponding to discourse domain [0, 1, 2, 3, 4]]；
Input variable QiIs taken as [ NB, 0, PB ]]Corresponding to discourse domain [0, 1, 2]；
The fuzzy subset of the output control variable u' is taken as [ NB, NS, 0, PS, PB ], corresponding to the discourse field [0, 1, 2, 3, 4 ].
(2) Input and output quantization factor
Humidity value h of flue gasiQuantization factor (blurring factor) k ofh＝4/40＝0.1；
Flue gas flow value QiQuantization factor (blurring factor) k ofq＝2/5＝0.4；
Quantization factor (deblurring factor) k of output control variable uuWhen 5/4 is 1.25, it is relative to the acid adding peristaltic pump driving signal 0-5V and the rotating speed 0-10 r/min.
(3) Function of degree of membership
Using triangles as membership functions, i.e.
(4) Fuzzy rule
Through the rule form, the actual experience and theoretical analysis of the flue gas humidity, the sampling flow and the acid adding driving signal are combined to obtain a fuzzy control rule table, as shown in table 1:
TABLE 1 fuzzy control rules Table
(5) Fuzzy decision making
The fuzzy decision is the defuzzification, that is, the fuzzy control is quantized into the actual accurate control quantity. By the usual common weighted average method
When an actual flue gas humidity value and a flow value are measured, the actual flue gas humidity value and the flow value are quantized through a fuzzy domain and then enter a fuzzy control FLC, fuzzy control variables are output after rule judgment and analysis, then the fuzzy control variables are changed into actual control signals through fuzzy decision, and an acidification peristaltic pump is driven through D/A conversion, so that the rotation speed of the acidification peristaltic pump is adjusted to change acidification flow, and finally the minimum component loss rate is ensured. When the humidity and the flow in the flue gas change, the fuzzy input variable also changes, the controller outputs corresponding changes, and the rotating speed of the acid adding peristaltic pump also changes correspondingly, so that the acid adding amount also changes correspondingly, and the process is repeated, and the rotating speed of the acid adding peristaltic pump is adjusted in real time according to the humidity and the flow to ensure the proper acid adding amount, thereby achieving the purpose of effective and economic utilization.
The working principle of the specific embodiment is as follows: after the CEMS system is electrified and works, the flue gas sample gas is pumped to the heat tracing sampling pipeline 1 through the air pump, and after the upper computer controller 8 collects the current humidity value and sample gas flow value in the flue gas sample gas, a driving signal u is obtained through a fuzzy control algorithm and D/A conversion0Driving the acid adding peristaltic pump 3 to adjust the rotating speed until the rotating speed is stable, so as to achieve the acid adding amount matched with the current sample gas humidity value and flow value; the acid adding peristaltic pump 3 continuously extracts acid liquor from the acid liquor storage tank 2, the outlet end of the acid adding peristaltic pump 3 is mixed with the heat tracing sampling pipeline 1 through the three-way joint 4 and then is introduced into the air inlet end of the condenser 5, and condensation is discharged through the condensation discharging peristaltic pump 7 after condensation; the dehumidified dry sample gas is delivered to a subsequent analysis instrument through an air outlet pipe 6. When the flow and the humidity of the flue gas sample change, the driving signal value given by the fuzzy control algorithm also changes, and the rotating speed of the acid adding peristaltic pump 3 is changed along with the change of the driving signal value, so that the aim of adjusting the acid adding amount is fulfilled; when the acid adding amount is not required to be adjusted according to the humidity and the flow of the flue gas, the acid adding amount can be switched to be constant acid adding modeAnd (3) according to the default set value, the acid adding amount of the driving signal is fixed.
Compared with the traditional monitoring and preprocessing system, the embodiment has the advantages that:
(1) the method comprises the following steps of (1) adjusting the rotating speed of an acidification peristaltic pump by adopting a flue gas humidity value and a flow value of a CEMS system and utilizing a fuzzy control algorithm;
(2) the method can be realized by using the original hardware equipment without adding other hardware;
(3) the peristaltic pump is controlled by a fuzzy control algorithm, so that two acid adding modes of constant speed and variable speed can be realized;
(4) the algorithm software can be completely realized on an upper computer of the CEMS system, and can also be realized independently without influencing the performance of other software;
(5) the device is suitable for pretreatment dehumidification of most cold-dry CEMS systems, does not need manual adjustment, and is self-stable in adjustment;
(6) the acid liquor is effectively and economically utilized, the effect of low loss rate can be achieved, the waste is avoided, the secondary pollution to the environment is reduced, and the method has wide market application prospect.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. An intelligent acid adding device for continuous smoke emission and cold and dry pretreatment is characterized by comprising a heat tracing sampling pipeline (1), an acid liquid storage tank (2), an acid adding peristaltic pump (3), a three-way joint (4), a condenser (5), an air outlet pipe (6), a condensation discharging peristaltic pump (7) and an upper computer controller (8), wherein one end of the heat tracing sampling pipeline (1) is a smoke inlet, the other end of the heat tracing sampling pipeline (1) is connected with one end of the three-way joint (4), the other end of the three-way joint (4) is connected with the outlet end of the acid adding peristaltic pump (3), the inlet end of the acid adding peristaltic pump (3) is connected with the acid liquid storage tank (2), the third port of the three-way joint (4) is connected with the air inlet end of the condenser (5), the air outlet end of the condenser (5) is connected with the air outlet pipe (6), the outlet of the condenser (5) is connected with the condensation discharging pump (7), the acidification peristaltic pump (3) is connected with an upper computer controller (8).
2. The intelligent acid adding device for the continuous smoke discharge cold and dry pretreatment according to claim 1, wherein the acid adding peristaltic pump (3) is a speed-adjustable peristaltic pump.
3. The intelligent acid adding device for the continuous smoke exhaust cold and dry pretreatment according to claim 1, wherein a suction pump is installed on a pipeline connected with the heat tracing sampling pipeline (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922300968.7U CN211799904U (en) | 2019-12-19 | 2019-12-19 | Intelligent acid adding device for continuous smoke emission cold-dry pretreatment |
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| CN201922300968.7U CN211799904U (en) | 2019-12-19 | 2019-12-19 | Intelligent acid adding device for continuous smoke emission cold-dry pretreatment |
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