CN113834854B - Acid dew point temperature monitoring system for air bath flue gas - Google Patents
Acid dew point temperature monitoring system for air bath flue gas Download PDFInfo
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- CN113834854B CN113834854B CN202111111497.0A CN202111111497A CN113834854B CN 113834854 B CN113834854 B CN 113834854B CN 202111111497 A CN202111111497 A CN 202111111497A CN 113834854 B CN113834854 B CN 113834854B
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- dew point
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 218
- 239000003546 flue gas Substances 0.000 title claims abstract description 218
- 239000002253 acid Substances 0.000 title claims abstract description 119
- 238000012544 monitoring process Methods 0.000 title claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 97
- 238000009833 condensation Methods 0.000 claims abstract description 44
- 230000005494 condensation Effects 0.000 claims abstract description 44
- 238000012360 testing method Methods 0.000 claims abstract description 32
- 230000001276 controlling effect Effects 0.000 claims description 28
- 238000001514 detection method Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000000446 fuel Substances 0.000 claims description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 12
- 238000004891 communication Methods 0.000 claims description 12
- 229910052717 sulfur Inorganic materials 0.000 claims description 12
- 239000011593 sulfur Substances 0.000 claims description 12
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 238000013178 mathematical model Methods 0.000 claims description 8
- 238000005259 measurement Methods 0.000 claims description 7
- 238000004887 air purification Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 11
- 238000004458 analytical method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000000523 sample Substances 0.000 description 6
- 238000004364 calculation method Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- -1 inorganic Chemical compound 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
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- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
- G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
Abstract
The invention provides a wind bath flue gas acid dew point temperature monitoring system, comprising: the system comprises a control module, a flue gas parameter adjusting module, a field air parameter adjusting module and an acid dew point test module, wherein the flue gas parameter adjusting module, the field air parameter adjusting module and the acid dew point test module are connected with the control module. According to the embodiment of the invention, the standard flue gas and the standard air gas are obtained by arranging the flue gas parameter adjusting module and the on-site air parameter adjusting module, the standard flue gas is introduced into the outer sleeve of the condensation chamber, and the standard air gas is input into the inner sleeve of the condensation chamber; the exposed face of the inner sleeve will be exposed to standard flue gas. The control module can control to gradually reduce the temperature of the standard flue gas in the outer sleeve, the camera shooting assembly shoots the dew point surface on the inner sleeve, when the camera shooting assembly shoots that brown acid dew point spots appear on the dew point surface, the temperature reduction operation on the standard air gas is stopped, then the acid dew point temperature is adjusted based on the temperature of the standard air gas at the moment, and the purpose of monitoring the acid dew point temperature in real time is achieved.
Description
Technical Field
The invention relates to the field of acid dew point temperature monitoring, in particular to an acid dew point temperature monitoring system for wind bath flue gas.
Background
Various fuels (including coal, natural gas, etc.) contain varying amounts of sulfur (including inorganic, organic) that react with O during combustion 2 Generating SO by reaction 2 ，SO 2 With O 2 The reaction again takes place to form SO 3 ，SO 3 And H is 2 The O reacts to form dilute sulfuric acid, which is very corrosive and can acid corrode metals (including stainless steel) and severely damage flue equipment.
The conditions for low temperature acid corrosion are determined by the acid dew point temperature. Dew acid corrosion occurs when the flue gas discharge temperature is below the acid dew point temperature. In order to avoid low-temperature acid corrosion, the flue gas discharge temperature is mainly increased at present to achieve the aim of protecting flue equipment, but the heat efficiency of the coal-fired gas boiler is lost due to the excessively high flue gas discharge temperature. According to the statistics of authorities, the heat efficiency is reduced by 1% when the discharge temperature of the flue gas is increased by 15-20 ℃, otherwise, the discharge temperature of the flue gas is reduced by 15-20 ℃, the heat efficiency is increased by 1%, and the carbon emission is reduced by 1%.
Obviously, the acid dew point temperature is monitored in real time, and the discharge temperature of the flue gas is adjusted according to the acid dew point temperature, so that low-temperature acid corrosion can be avoided, flue equipment is protected, the thermal efficiency can be improved, and carbon emission is reduced.
Disclosure of Invention
Currently, regarding the determination of the acid dew point temperature, there are the following technical solutions:
first, a theoretical calculation scheme combining a mathematical model with a graphical curve.
The theoretical calculation scheme is the most used technical scheme at present, and the theoretical calculation scheme is used for calculating the acid dew point temperature based on the sulfur concentration (content) Sar, the air excess coefficient alpha, the dust content and the water vapor content in the fuel gas. However, the error of the acid dew point temperature calculated by the theoretical calculation scheme is large and can not be used as a standard parameter for controlling the temperature of the flue gas
Second, a hand-held portable acid dew point test instrument.
The testing principle of the tester is that the acid dew point H 2 SO 4 Ion conductivity; when the portable acid dew point testing device is used, the portable acid dew point testing device is inserted into the flue equipment, when the probe temperature of the portable acid dew point testing device is reduced to the acid dew point temperature, the electric conduction characteristics between the two electrodes on the surface of the probe are changed accordingly, and then the probe temperature is determined to be the acid dew point temperature. The existing hand-held portable acid dew point meter scheme has large repeatability errors due to the fact that current, voltage and acid dew point temperature are not synchronous, and a tester is in danger of poisoning in the operation process.
In view of the above, the invention provides a system for monitoring the acid dew point temperature of wind bath flue gas, so as to achieve the purpose of monitoring the acid dew point temperature in real time.
In order to achieve the above object, the present invention provides the following solutions:
a wind bath flue gas acid dew point temperature monitoring system comprising: the system comprises a control module, a flue gas parameter adjusting module, a field air parameter adjusting module and an acid dew point test module, wherein the flue gas parameter adjusting module, the field air parameter adjusting module and the acid dew point test module are connected with the control module;
the flue gas parameter adjusting module is used for adjusting the gas parameters of the flue gas in the current stage to obtain standard flue gas; the gas parameters of the standard flue gas meet a first preset requirement;
the on-site air parameter adjusting module is used for adjusting the gas parameters of on-site air at the current stage to obtain standard air gas; the gas parameters of the standard air gas accord with a second preset requirement;
the acid dew point test module comprises a dew condensation cabin and a camera shooting assembly; the dewing cabin is of a sleeve structure; the sleeve structure comprises an inner sleeve and an outer sleeve; the inner sleeve is used for introducing the standard air gas; the outer sleeve is used for introducing the standard flue gas; a part or all of the outer sleeve is a transparent area, and the inner sleeve is provided with a junction surface on an area corresponding to the transparent area; the camera shooting component is used for shooting the condensation surface through the transparent area;
the control module is used for controlling the temperature of the standard air gas entering the acid dew point test module to be reduced by a set value every preset time period under the actual measurement mode until the camera shooting assembly shoots that the dew point spots on the dew point surface are stopped, and updating the acid dew point temperature according to the target temperature; the target temperature is: the temperature of the standard air gas in the acid dew point test module when the dew point spot appears on the dew point surface.
Optionally, the flue gas parameter adjustment module comprises a flue gas flow line, a flue gas pressure transmitter, a flue gas wind bath cooler, a first valve, and a flue gas temperature control assembly;
the flue gas temperature control assembly is disposed on the flue gas flow conduit; the output end of the flue gas circulation pipeline is connected with the input end of the flue gas wind bath cooler through a first communication pipeline; the flue gas pressure transmitter and the first valve are disposed on the first communication line;
the control module is further configured to:
controlling the operation of the flue gas temperature control assembly to cause the flue gas temperature control assembly to regulate the temperature of the flue gas in the flue gas flow line;
controlling the opening of the first valve based on the gas pressure detected by the flue gas pressure transmitter to enable the first valve to adjust the pressure and flow of the flue gas;
and the flue gas input by the input end of the flue gas wind bath cooler is the calibration flue gas, and the temperature, the pressure and the flow of the calibration flue gas meet the third preset condition.
Optionally, the input end of the flue gas wind bath cooler comprises a first input end and a second input end; the first input end is used for inputting the calibration flue gas; the second input end is used for inputting purified wind gas;
the output end of the flue gas wind bath cooler is used for outputting the standard flue gas, and is at least connected with the outer sleeve;
the control module is further configured to: controlling the flue gas wind bath cooler to regulate the temperature according to the temperature of the calibrated flue gas so as to enable the temperature of the standard flue gas output by the flue gas wind bath cooler to be within a set threshold range;
the first preset requirement comprises the set threshold range, and the set threshold range is specifically t+Δt1-t+Δt2; t represents the acid dew point temperature, Δt1 and Δt2 are both positive numbers, and Δt1< Δt2.
Optionally, the first preset requirement comprises that the pressure is 0.1MPa, the flow is 5L/min, and the temperature range is 95-110 ℃;
the third preset requirement includes: the pressure is 0.1MPa, the flow is 5L/min, and the temperature range is 198-200 ℃.
Optionally, the on-site air parameter adjusting module comprises an air circulation pipeline, an air temperature control assembly, an air pressure transmitter, a hot air bath cooler and a second valve;
the output end of the air circulation pipeline is connected with the input end of the inner sleeve; the air temperature control assembly, the air pressure transmitter, the hot air bath cooler and the second valve are arranged on the air flow pipeline; the first input end of the hot air and air bath cooler is used for inputting purified air;
the control module is further configured to:
controlling the air temperature control assembly to work so as to enable the air temperature control assembly to adjust the temperature of the field air in the air circulation pipeline, thereby obtaining air gas with adjusted temperature;
controlling the hot air bath cooler to work based on the temperature of the air gas after temperature adjustment so as to enable the temperature of the calibrated air gas output by the hot air bath cooler to be within the set threshold range;
and controlling the opening degree of the second valve based on the gas pressure detected by the air pressure transmitter so that the second valve regulates the pressure and flow of the on-site air.
Optionally, the temperature range of the air gas regulated by the air temperature control component is 178-180 ℃;
the second preset requirements include: the pressure is 0.1MPa, the flow is 5L/min, and the temperature range is 95-110 ℃.
Optionally, the acid dew point test module further comprises a thermostat, a first temperature sensor, and a second temperature sensor;
the length of the inner sleeve is greater than the length of the outer sleeve; the inner sleeve is divided into three parts, the first part is arranged in the thermostat, the second part is arranged in the condensation cabin, and the third part is communicated with the output end of the air circulation pipeline;
the second temperature sensor is disposed within the first portion; the first temperature sensor is arranged on a second communication pipeline between the output end of the flue gas wind bath cooler and the input end of the outer sleeve, and the second communication pipeline is positioned in the thermostat;
the control module is further configured to:
controlling the flue gas wind bath cooler to work according to the temperature information acquired by the first temperature sensor so as to enable the temperature of standard flue gas output by the flue gas wind bath cooler to be within the set threshold range;
controlling the hot air bath cooler to work according to the temperature information acquired by the second temperature sensor so as to enable the temperature of the calibrated air gas output by the hot air bath cooler to be within the set threshold range;
wherein the target temperature is determined by the second temperature sensor acquisition.
Optionally, the system also comprises a multifunctional detection module;
the output end of the flue flow pipeline is also communicated with the input end of the multifunctional detection module;
the output end of the outer sleeve is communicated with the input end of the multifunctional detection module;
the output end of the multifunctional detection module is communicated with an external air purification device;
the multifunctional detection module is used for: determining a fuel base sulfur content and a water dew point temperature of the calibrated flue gas and sending the fuel base sulfur content and the water dew point temperature to the control module;
the control module is further configured to:
determining an initial value of an acid dew point temperature based on a mathematical model, the fuel base sulfur content, and the water dew point temperature;
and when the dew point spots appear on the dew point, updating the acid dew point temperature to be the sum of the target temperature and a first numerical value.
Optionally, the flow direction of the gas in the inner sleeve is opposite to the flow direction of the gas in the outer sleeve.
Optionally, a vent hole is formed in the area of the inner sleeve corresponding to the condensation surface.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the embodiment of the invention, the standard flue gas and the standard air gas are obtained by arranging the flue gas parameter adjusting module and the on-site air parameter adjusting module, the standard flue gas is introduced into the outer sleeve of the condensation chamber, and the standard air gas is input into the inner sleeve of the condensation chamber; the exposed face of the inner sleeve will be exposed to standard flue gas. In the embodiment of the invention, the control module can control the temperature of the standard flue gas in the outer sleeve to be gradually reduced (the temperature of the standard air gas in the inner sleeve is controlled to be reduced by a set value every a preset time period), the camera shooting assembly shoots the condensation surface on the inner sleeve, when the camera shooting assembly shoots that brown acid dew point spots appear on the condensation surface, the temperature reduction operation of the standard air gas is stopped, and then the acid dew point temperature is adjusted based on the temperature of the standard air gas, so that the purpose of monitoring the acid dew point temperature in real time is achieved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a wind bath flue gas acid dew point temperature monitoring system of the present invention;
FIG. 2 is a schematic diagram of the structure of the acid dew point temperature monitoring system of the flue gas of the wind bath of the present invention;
FIG. 3 is a schematic diagram of a flue gas parameter adjustment module according to the present invention;
FIG. 4 is a graph of pressure versus flow for the present invention;
FIG. 5 is a schematic view of a field air parameter adjustment module according to the present invention;
FIG. 6 is a schematic diagram of the structure of the acid dew point test module of the present invention;
FIG. 7 is a schematic view of the construction of the condensation chamber of the present invention;
FIG. 8 is a schematic diagram of a multifunctional measuring module according to the present invention;
FIG. 9 is a schematic diagram of an analysis cabin according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, an embodiment of the present invention provides a system for monitoring an acid dew point temperature of a flue gas in a wind bath, comprising: the system comprises a control module, a flue gas parameter adjusting module, a field air parameter adjusting module and an acid dew point test module, wherein the flue gas parameter adjusting module, the field air parameter adjusting module and the acid dew point test module are connected with the control module.
The flue gas parameter adjusting module is used for adjusting the gas parameters of the flue gas in the current stage to obtain standard flue gas; the gas parameters of the standard flue gas meet a first preset requirement.
The on-site air parameter adjusting module is used for adjusting the gas parameters of on-site air at the current stage to obtain standard air gas; the gas parameters of the standard air gas meet the second preset requirements.
The acid dew point test module comprises a dew condensation cabin and a camera shooting assembly; the dewing cabin is of a sleeve structure; the sleeve structure comprises an inner sleeve and an outer sleeve; the inner sleeve is used for introducing the standard air gas; the outer sleeve is used for introducing the standard flue gas; a part or all of the outer sleeve is a transparent area, and the inner sleeve is provided with a junction surface on an area corresponding to the transparent area; the camera shooting component is used for shooting the condensation surface through the transparent area.
The control module is used for controlling the temperature of the standard air gas entering the acid dew point test module to be reduced by a set value every preset time period under the actual measurement mode until the camera shooting assembly shoots that the dew point spots on the dew point surface are stopped, and updating the acid dew point temperature according to the target temperature; the target temperature is: the temperature of the standard air gas in the acid dew point test module when the dew point spot appears on the dew point surface.
According to the embodiment of the invention, the standard flue gas and the standard air gas are obtained by arranging the flue gas parameter adjusting module and the on-site air parameter adjusting module, the standard flue gas is introduced into the outer sleeve of the condensation chamber, and the standard air gas is input into the inner sleeve of the condensation chamber; the exposed face of the inner sleeve will be exposed to standard flue gas. In the embodiment of the invention, the control module can control the temperature of the standard flue gas in the outer sleeve to be gradually reduced (the temperature of the standard air gas in the inner sleeve is controlled to be reduced by a set value every a preset time period), the camera shooting assembly shoots the condensation surface on the inner sleeve, when the camera shooting assembly shoots that brown acid dew point spots appear on the condensation surface, the temperature reduction operation of the standard air gas is stopped, and then the acid dew point temperature is adjusted based on the temperature of the standard air gas, so that the purpose of monitoring the acid dew point temperature in real time is achieved.
The following describes each module in the system according to the embodiment of the present invention in detail through specific drawings. All relevant detection equipment and pipelines in the embodiment of the invention adopt H-resistant detection equipment and pipelines 2 SO 4 Is a titanium material of (3).
Referring to fig. 2, the system for monitoring the acid dew point temperature of the flue gas in the wind bath provided by the embodiment of the invention mainly comprises a flue gas wind bath cooler, a hot wind bath cooler, a condensation cabin, a camera, a multifunctional measuring module and the like.
According to experiments, the temperature of air gas in the dewing cabin is 5-8 ℃ higher than the acid dew point temperature, the temperature is reduced by 1 ℃ every 3 minutes from high to low until brown acid dew point spots stop on the dewing surface, and the acid dew point temperature of flue gas is obtained by adding 0.8 ℃ on the basis of the inner sleeve gas temperature. The invention carries out intelligent optimization control on the pressure, flow and temperature of the flue gas and the air gas through computer optimization calculation.
Flue gas parameter adjustment module
The flue gas parameter adjustment module includes a flue gas flow line, a flue gas pressure transmitter, a flue gas wind bath cooler, a first valve, and a flue gas temperature control assembly.
The flue gas temperature control assembly is disposed on the flue gas flow conduit; the output end of the flue gas circulation pipeline is connected with the input end of the flue gas wind bath cooler through a first communication pipeline; the flue gas pressure transmitter and the first valve are disposed on the first communication line.
The control module is further configured to:
controlling the operation of the flue gas temperature control assembly to cause the flue gas temperature control assembly to regulate the temperature of the flue gas in the flue gas flow line;
controlling the opening of the first valve based on the gas pressure detected by the flue gas pressure transmitter to enable the first valve to adjust the pressure and flow of the flue gas;
and controlling the flue gas wind bath cooler to regulate the temperature according to the temperature of the calibrated flue gas so as to enable the temperature of the standard flue gas output by the flue gas wind bath cooler to be within a set threshold range.
Wherein the input end of the flue gas wind bath cooler comprises a first input end and a second input end; the first input end is used for inputting the calibration flue gas; the second input end is used for inputting purified wind gas; the temperature, pressure and flow of the calibrated flue gas meet a third preset condition. The output end of the flue gas wind bath cooler is used for outputting the standard flue gas, and the output end of the flue gas wind bath cooler is at least connected with the outer sleeve.
The first preset requirement comprises the set threshold range, and the set threshold range is specifically t+Δt1-t+Δt2; t represents the acid dew point temperature, Δt1 and Δt2 are both positive numbers, and Δt1< Δt2. The first preset requirement comprises that the pressure is 0.1MPa, the flow is 5L/min, and the temperature range is 95-110 ℃; the third preset requirement includes: the pressure is 0.1MPa, the flow is 5L/min, and the temperature range is 198-200 ℃.
An example is: as shown in fig. 3, the flue gas parameter adjustment module includes a flue gas flow line, a flue gas wind bath cooler GG-01, a flue gas pressure transmitter PI-01, and a secondary filter V01, a flue gas temperature control assembly TC-01 and a four-way pipe disposed on the flue gas flow line in a gas flow direction.
The flue gas wind bath cooler GG-01 comprises a first input end, a second input end, a first output end and a second output end; wherein, the second input end is provided with first governing valve TV-03, and the second input is used for the input to purify wind gas, and the second output is connected to the chimney. Wherein the pressure of the purified air is 0.1MPa, the temperature is normal temperature, and the flow rate is changed between 2L/min and 5L/min.
The first end of the four-way pipe is communicated with the output end of the flue gas circulation pipeline, the second end of the four-way pipe is communicated with the first input end of the flue gas wind bath cooler GG-01 through a first manual shut-off valve F01 (namely a first valve), the third end of the four-way pipe is communicated with the multifunctional detection module through an air needle valve F02 and the first input end of the first three-way valve in sequence, and a flue gas pressure transmitter PI-01 is arranged on the fourth end of the four-way pipe; the first output of the flue gas wind bath cooler GG-01 communicates with an acid dew point test module.
An in-situ pressure gauge PG-01 is provided at the input of the secondary filter V01, and an in-situ pressure gauge PG-02 is provided at the output of the secondary filter V01.
The flue gas temperature control assembly TC-01 comprises a flue gas electric heating rod TM-01, a flue gas electric pump starter HM-01 and an electric pump motor B01; a temperature probe is provided at the input of the flue gas temperature control assembly TC-01.
Tests have shown that the temperature of the flue gas entering the dewing cabin cannot be much higher than the acid dew point temperature nor lower than the acid dew point temperature, the optimum temperature of the flue gas being 5-8 ℃ higher than the acid dew point temperature. Based on the optimal temperature of the flue gas, the embodiment of the invention carries out intelligent management and control on the pressure, the flow and the temperature of the flue gas by an automatic control technology, and the specific process is as follows:
the flue gas from the flue filter sequentially enters a secondary filter V01 and a flue gas temperature control component TC-01 to obtain the flue gas with the temperature of 198-200 ℃; the control module controls the opening of the first manual shut-off valve F01 and the air needle valve F02 based on pressure data acquired by the flue gas pressure transmitter PI-01 to control the pressure and flow rate of the flue gas.
Referring to FIG. 4, the flue gas fed into the flue gas wind bath cooler GG-01 had a pressure of 0.1MPa, a flow rate of 5L/min, and a temperature in the range of 198℃to 200 ℃. Then the opening degree of the first regulating valve TV-03 is controlled by a control module, so that the pressure of the flue gas output by the flue gas wind bath cooler GG-01 is 0.1MPa, the flow is 5L/min, and the temperature range is 95-110 ℃.
On-site air parameter adjusting module
The on-site air parameter adjusting module comprises an air circulation pipeline, an air temperature control assembly, an air pressure transmitter, a hot air and air bath cooler and a second valve.
The output end of the air circulation pipeline is connected with the input end of the inner sleeve; the air temperature control assembly, the air pressure transmitter, the hot air bath cooler and the second valve are arranged on the air flow pipeline; the first input end of the hot air and air bath cooler is used for inputting purified air.
The control module is further configured to:
controlling the air temperature control assembly to work so as to enable the air temperature control assembly to adjust the temperature of the field air in the air circulation pipeline, thereby obtaining air gas with adjusted temperature;
controlling the hot air bath cooler to work based on the temperature of the air gas after temperature adjustment so as to enable the temperature of the calibrated air gas output by the hot air bath cooler to be within the set threshold range;
and controlling the opening degree of the second valve based on the gas pressure detected by the air pressure transmitter so that the second valve regulates the pressure and flow of the on-site air.
Wherein the temperature range of the air gas regulated by the air temperature control component is 178-180 ℃; the second preset requirements include: the pressure is 0.1MPa, the flow is 5L/min, and the temperature range is 95-110 ℃.
An example is: as shown in fig. 5, the air-gas parameter adjusting module includes an air circulation pipeline, and an air filter V02, an air temperature control component TC-02, an air pressure transmitter PI-02, a hot air bath cooler GG-02, an air needle valve F04 (i.e., a second valve) and a second three-way valve which are sequentially arranged according to the gas flowing direction.
The hot air bath cooler GG-02 comprises a first input end, a second input end, a first output end and a second output end; wherein, the second input end is provided with second governing valve TV-10, and the second input is used for the input to purify wind gas, and the second output is connected to the chimney.
The air temperature control assembly TC-02 includes an air electric heater rod TM-02, an air electric pump starter HM-02, and an electric pump motor B02. A temperature probe is provided at the input of the air temperature control assembly TC-02.
Referring to FIG. 4, the field air passes through a mini-air filter V02 and enters the air temperature control assembly TC-02. The control module controls the hot air electric pump HH-02 to work to obtain air gas with the temperature of 178-180 ℃; air gas with the temperature of 178-180 ℃ enters the hot air bath cooler GG-02 through the first input end, and air gas with the temperature of 95-110 ℃ is output. The control module controls the opening degree of the air needle valve F02 (namely the second valve) based on the data acquired by the air gas pressure transmitter PI-02 to control the pressure and flow rate of the air gas, so that the pressure of the gas flowing into the inner sleeve is 0.1MPa, the flow rate is 5L/min, and the temperature range is 95-110 ℃.
The inner sleeve is communicated with the output end of the air needle valve F02 through the first end and the second end of the second three-way valve in sequence; the third end of the second three-way valve is communicated with the multifunctional measuring module through an air needle valve F03 and the second input end of the first three-way valve; the first end of the second three-way valve is communicated with the outer sleeve.
Acid dew point test module
The acid dew point test module also includes a thermostat, a first temperature sensor, and a second temperature sensor.
The length of the inner sleeve is greater than the length of the outer sleeve; the inner sleeve is divided into three parts, the first part is arranged in the thermostat, the second part is arranged in the condensation cabin, and the third part is communicated with the output end of the air circulation pipeline.
The second temperature sensor is disposed within the first portion; the first temperature sensor is arranged on a second communication pipeline between the output end of the flue gas wind bath cooler and the input end of the outer sleeve, and the second communication pipeline is positioned in the thermostat.
The control module is further configured to:
controlling the flue gas wind bath cooler to work according to the temperature information acquired by the first temperature sensor so as to enable the temperature of standard flue gas output by the flue gas wind bath cooler to be within the set threshold range;
and controlling the hot air bath cooler to work according to the temperature information acquired by the second temperature sensor so as to enable the temperature of the calibrated air gas output by the hot air bath cooler to be within the set threshold range.
The target temperature is determined through the second temperature sensor, the flowing direction of the gas in the inner sleeve is opposite to that of the gas in the outer sleeve, and the area of the inner sleeve corresponding to the dew point is provided with a vent hole.
One example is: as shown in fig. 6 and 7, the acid dew point test module includes an incubator, a thermostat XT01 provided in the incubator, a dew condensation compartment S01, a camera C1-01, a first temperature sensor TC-03, and a second temperature sensor TC-10.
The control module controls the opening degree of the first regulating valve through data collected by the first temperature sensor TC-03 and a PID regulating loop control program, so that the gas parameters of the flue gas entering the dewing cabin accord with the actual requirements. Wherein, first temperature sensor TC-03 sets up in the thermostat, has guaranteed the measurement accuracy of flue gas temperature, has also guaranteed the measurement accuracy of flue gas acid dew point temperature simultaneously.
And the same is true. The control module controls the opening degree of the second regulating valve through data collected by the second temperature sensor TC-10 and a PID regulating loop control program, so that the gas parameters of air and gas entering the dewing cabin accord with actual requirements. The second temperature sensor TC-10 is arranged in the inner sleeve and positioned in the incubator, so that the measurement accuracy of the air gas temperature is ensured, and the measurement accuracy of the acid dew point temperature of the flue gas is also ensured.
Standard flue gas enters the condensation chamber S01 through a Φ25x3 flue gas pipeline (i.e., an outer sleeve) of the thermostat XT-01, and the residence time is less than 0.7 seconds; and then the condensation cabin S01 enters the multifunctional measuring module XT-02 through the outer sleeve, the second three-way valve and the air needle valve F03.
Standard air gas enters the condensation chamber S01 through the hot air sleeve Φ10x1 (i.e., inner sleeve). Because the region of the inner sleeve corresponding to the condensation surface is provided with the vent holes, hot air is sprayed to the condensation surface SO2 from bottom to top through the hole phi 5mm in the tee joint from the right, and flows out of the condensation cabin from top to bottom through the hole phi 5mm on the left, the residence time of the hot air through the hot air tee joint is less than 0.2 seconds, and the temperature of the condensation surface SO2 is controlled. Since the temperature of the hot air can be automatically controlled, the temperature is reduced from 96 ℃ at a rate of change of 1 ℃ every 3 minutes, the temperature is reduced from high to low, and the temperature of the condensation surface is also changed along with the rate of change of the temperature reduction of the hot air until a condensation picture appears.
Experiments prove that the condensation process of the condensation surface is three states, and brown spots and spots can appear as the temperature is reduced. From brown spots to acidic condensate, the longest process can reach a temperature change of about 20 ℃, and in the process, the moment of brown spots is truly represented by the acid dew point temperature.
The view cabin K0 in the condensation cabin S01And a high-definition camera CI-01 with lamplight is arranged above the camera lens 1 (composed of quartz glass). The high-definition camera CI-01 records the condensation process of the condensation surface and inputs a digital recording signal into the control module through the RS-485 interface. The comparison and the discrimination are carried out between the video picture discrimination software and a standard dew point picture (brown spot) to obtain a dew point surface SO 2 The temperature is the flue gas acid dew point temperature. The acid dew point temperature is equal to the sum of the temperature collected by the second temperature sensor and 0.8 ℃.
Because the flow direction of the gas in the inner sleeve is opposite to the flow direction of the gas in the outer sleeve, the invention flows the flue gas from left to right to pass through the condensation chamber S01, and simultaneously flows the hot air from right to left to the condensation chamber S01 through the hot air sleeve phi 10x 1. The two flow in opposite directions in different pipelines, so that optimized state and condition are created for condensation, and high-precision real acid dew point temperature can be obtained.
Multifunctional detection module
The output end of the flue gas flow pipeline in the flue gas parameter adjusting module is also communicated with the input end of the multifunctional detecting module; the output end of the outer sleeve is communicated with the input end of the multifunctional detection module. The output end of the multifunctional detection module is communicated with an external air purification device.
The multifunctional detection module is used for: determining a fuel base sulfur content and a water dew point temperature of the calibrated flue gas and sending the fuel base sulfur content and the water dew point temperature to the control module;
the control module is further configured to: determining an initial value of an acid dew point temperature based on a mathematical model, the fuel base sulfur content, and the water dew point temperature; and when the dew point spots appear on the dew point, updating the acid dew point temperature to be the sum of the target temperature and a first numerical value.
The mathematical model is
Wherein t is sid Acid dew point temperatureInitial value of degree C DEG, t id -water dew point temperature C DEG, k-correction coefficient, S ar Fuel contains percent of base sulfur.
One example is: referring to fig. 8, the flue gas output by the multifunctional measuring module XT-02 is subjected to CO 2 The analyzer then enters a chimney in the analysis cabin and is discharged outwards from the chimney.
The acidic condensate generated by each functional module during operation is discharged to a chimney in the analysis cabin through a manual valve and a hose, and is uniformly discharged to a sewage channel (small in quantity) outside the analysis cabin from the bottom of the chimney.
The analysis cabin, as shown in fig. 9, is manufactured according to the national standard; an explosion-proof air conditioner, an explosion-proof electric heat collector, an explosion-proof lamp and CO are arranged in the analysis cabin 2 Overrun alarms, etc.
Other functions of the control module
(1) Correction of acid dew point mathematical model
Measuring water dew point, water vapor amount, oxygen content, CO of flue gas by multifunctional probe DI-01 in multifunctional measuring module XT-02 2 、SO 2 And inputting the same parameters into the control module. And compensating and correcting a curve calculated by a set of acid dew point mathematical model obtained by big data analysis in the control module and the temperature detected by the real acid dew point to obtain an online and continuous high-precision (error is less than 1 ℃) acid dew point temperature output.
Through experiments, if the conditions of the fuel type, the boiler structure, the operation method, the oxygen content and the like are unchanged, the change rate of the acid dew point is unchanged, and the output mathematical model curves are consistent. If the fuel type, the boiler structure, the operation method and the like are changed, the monitoring system provided by the invention is started for compensation and correction once. Or the acid dew point temperature is regularly corrected every month, and the precision of the continuous output can be ensured.
(5) The invention provides a starting time sequence principle of a monitoring system, which is started by a set of starting software program, and the process is specifically as follows:
a: and judging the conditions, namely judging 6 conditions, and entering the next program when the system meets the conditions. The method comprises the following steps:
1. the control module outputs the acid dew point temperature; 2. judging that the shooting interface of the camera is free from dew; 3. the starting temperature and the starting pressure in the flue gas parameter adjusting module meet the conditions; 4. the starting temperature and the starting pressure in the on-site air parameter adjusting module meet the conditions; 5. the pressure of the purified wind meets the conditions; and 6, manually determining that the field process meets the condition.
B: into the flue gas parameter adjustment module.
C: entering a field air parameter adjusting module.
D: enters an acid dew point test module.
E: and outputting an acid dew point temperature value.
F: and (5) finishing automatic detection of the acid dew point temperature.
The key point of the invention is that the pressure, flow rate and temperature of the introduced flue gas are optimized and controlled by corresponding components to meet the design requirement of the invention, then the computer is calculated according to specific characteristic parameters of the flue gas, the flue gas is cooled by using the wind bath technology, namely using purified wind, the opening degree of a regulating valve is controlled by a PID controller module of the computer, the flue gas is cooled by using purified wind at normal temperature, the temperature of the flue gas is 5-8 ℃ higher than the dew point temperature of the acid, the pressure is 0.1MPa, and the flow rate is in the optimal state at 5L/time.
In the same way, the temperature, pressure and flow of the air gas are optimized by utilizing the characteristics of the air heat pump, the optimized flue gas and the air gas enter the condensation cabin and flow inversely, the computer enables the air gas to drop from high to low by 1 degree of change rate every 3 minutes through the PID control loop until brown acid dew point spots appear on the condensation surface of the condensation cabin, the temperature of the condensation surface is the actual temperature of the acid dew point, and the aim of detecting the acid dew point temperature is achieved by the automatic intelligent operation of the computer in the whole process.
Compared with the prior art, the method measures the real data of the 24-hour continuous and reliable acid dew point temperature of the flue gas, so that the discharge temperature of the flue gas is increased by 5 ℃ on the basis of continuous and reliable acid dew point detection, thus completely avoiding acid corrosion, and according to the real and continuous reliable acid dew point control technology, the discharge temperature of the flue gas can be reduced by 40-50 ℃, the thermal efficiency of a boiler can be improved by 2-3%, and the carbon emission amount can be reduced by about 2-3%. Not only is environment-friendly, but also can save energy, and improves economic benefit and protection equipment.
The system for monitoring the acid dew point temperature of the air bath flue gas can realize that the automatic control and operation are adopted for detecting the discharge temperature and the acid dew point temperature of the flue gas, optimally control the pressure, the flow and the temperature of the flue gas and the air gas through a computer, and pick up the digital image of the acid dew point process of the flue gas in a dew cabin for dew judgment, and the high-definition, high-reliability and full-automatic flue gas acid dew point testing scheme not only greatly improves the acid dew point detection precision of the flue gas, but also can store all the processes into a computer memory, and take out parameters at any time for analysis. In addition, the detected acid dew point temperature may be corrected for the digital model; by the back-pushing of big data and the dew point, oxygen content and SO of water 2 Can obtain an on-line, continuous, high-precision output of the acid dew point temperature with the error less than 1 ℃.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (5)
1. A system for monitoring the acid dew point temperature of a flue gas in a wind bath, comprising: the system comprises a control module, a flue gas parameter adjusting module, a field air parameter adjusting module and an acid dew point test module, wherein the flue gas parameter adjusting module, the field air parameter adjusting module and the acid dew point test module are connected with the control module;
the flue gas parameter adjusting module is used for adjusting the gas parameters of the flue gas in the current stage to obtain standard flue gas; the gas parameters of the standard flue gas meet a first preset requirement;
the on-site air parameter adjusting module is used for adjusting the gas parameters of on-site air at the current stage to obtain standard air gas; the gas parameters of the standard air gas accord with a second preset requirement;
the acid dew point test module comprises a dew condensation cabin and a camera shooting assembly; the dewing cabin is of a sleeve structure; the sleeve structure comprises an inner sleeve and an outer sleeve; the inner sleeve is used for introducing the standard air gas; the outer sleeve is used for introducing the standard flue gas; a part or all of the outer sleeve is a transparent area, and the inner sleeve is provided with a junction surface on an area corresponding to the transparent area; the camera shooting component is used for shooting the condensation surface through the transparent area;
the control module is used for controlling the temperature of the standard air gas entering the acid dew point test module to be reduced by a set value every preset time period under the actual measurement mode until the camera shooting assembly shoots that the dew point spots on the dew point surface are stopped, and updating the acid dew point temperature according to the target temperature; the target temperature is: the temperature of standard air gas in the acid dew point test module when the dew point spots appear on the dew point surface;
the flue gas parameter adjustment module comprises a flue gas circulation pipeline, a flue gas pressure transmitter, a flue gas wind bath cooler, a first valve and a flue gas temperature control component;
the flue gas temperature control assembly is disposed on the flue gas flow conduit; the output end of the flue gas circulation pipeline is connected with the input end of the flue gas wind bath cooler through a first communication pipeline; the flue gas pressure transmitter and the first valve are disposed on the first communication line;
the control module is further configured to:
controlling the flue gas temperature control assembly to operate so that the flue gas temperature control assembly adjusts the temperature of the flue gas in the flue gas flow line;
controlling the opening of the first valve based on the gas pressure detected by the flue gas pressure transmitter to enable the first valve to adjust the pressure and flow of the flue gas;
the flue gas input by the input end of the flue gas wind bath cooler is a calibration flue gas, and the temperature, the pressure and the flow of the calibration flue gas meet a third preset condition;
the input end of the flue gas wind bath cooler comprises a first input end and a second input end; the first input end is used for inputting the calibration flue gas; the second input end is used for inputting purified wind gas;
the output end of the flue gas wind bath cooler is used for outputting the standard flue gas, and is at least connected with the outer sleeve;
the control module is further configured to: controlling the flue gas wind bath cooler to regulate the temperature according to the temperature of the calibrated flue gas so as to enable the temperature of the standard flue gas output by the flue gas wind bath cooler to be within a set threshold range;
the first preset requirement comprises the set threshold range, and the set threshold range is specifically t+Δt1-t+Δt2; t represents the acid dew point temperature, Δt1 and Δt2 are both positive numbers, and Δt1< Δt2;
the on-site air parameter adjusting module comprises an air circulation pipeline, an air temperature control assembly, an air pressure transmitter, a hot air bath cooler and a second valve;
the output end of the air circulation pipeline is connected with the input end of the inner sleeve; the air temperature control assembly, the air pressure transmitter, the hot air bath cooler and the second valve are arranged on the air flow pipeline; the first input end of the hot air and air bath cooler is used for inputting purified air;
the control module is further configured to:
controlling the air temperature control assembly to work so as to enable the air temperature control assembly to adjust the temperature of the field air in the air circulation pipeline, thereby obtaining air gas with adjusted temperature;
controlling the hot air bath cooler to work based on the temperature of the air gas after temperature adjustment so as to enable the temperature of the standard air gas output by the hot air bath cooler to be within the set threshold range;
controlling the opening of the second valve based on the gas pressure detected by the air pressure transmitter so that the second valve regulates the pressure and flow of the field air;
the acid dew point test module further comprises a thermostat, a first temperature sensor and a second temperature sensor;
the length of the inner sleeve is greater than the length of the outer sleeve; the inner sleeve is divided into three parts, the first part is arranged in the thermostat, the second part is arranged in the condensation cabin, and the third part is communicated with the output end of the air circulation pipeline;
the second temperature sensor is disposed within the first portion; the first temperature sensor is arranged on a second communication pipeline between the output end of the flue gas wind bath cooler and the input end of the outer sleeve, and the second communication pipeline is positioned in the thermostat;
the control module is further configured to:
controlling the flue gas wind bath cooler to work according to the temperature information acquired by the first temperature sensor so as to enable the temperature of standard flue gas output by the flue gas wind bath cooler to be within the set threshold range;
controlling the hot air bath cooler to work according to the temperature information acquired by the second temperature sensor so that the temperature of standard air gas output by the hot air bath cooler is within the set threshold range;
wherein the target temperature is determined by the second temperature sensor acquisition;
the flow direction of the gas in the inner sleeve is opposite to the flow direction of the gas in the outer sleeve.
2. A system for monitoring the acid dew point temperature of a flue gas in a wind bath according to claim 1,
the first preset requirement comprises that the pressure is 0.1MPa, the flow is 5L/min, and the temperature range is 95-110 ℃;
the third preset condition includes: the pressure is 0.1MPa, the flow is 5L/min, and the temperature range is 198-200 ℃.
3. The system according to claim 1, wherein the temperature range of the air gas regulated by the air temperature control component is 178-180 ℃;
the second preset requirements include: the pressure is 0.1MPa, the flow is 5L/min, and the temperature range is 95-110 ℃.
4. The system for monitoring the acid dew point temperature of wind bath flue gas according to claim 1, further comprising a multifunctional detection module;
the output end of the flue gas circulation pipeline is also communicated with the input end of the multifunctional detection module;
the output end of the outer sleeve is communicated with the input end of the multifunctional detection module;
the output end of the multifunctional detection module is communicated with an external air purification device;
the multifunctional detection module is used for: determining a fuel base sulfur content and a water dew point temperature of the calibrated flue gas and sending the fuel base sulfur content and the water dew point temperature to the control module;
the control module is further configured to:
determining an initial value of an acid dew point temperature based on a mathematical model, the fuel base sulfur content, and the water dew point temperature;
and when the dew point spots appear on the dew point, updating the acid dew point temperature to be the sum of the target temperature and a first numerical value.
5. The system of claim 1, wherein the area of the inner sleeve corresponding to the dew point is vented.
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