CN114135890A - Comprehensive flue gas treatment system and control method thereof - Google Patents

Comprehensive flue gas treatment system and control method thereof Download PDF

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Publication number
CN114135890A
CN114135890A CN202111478576.5A CN202111478576A CN114135890A CN 114135890 A CN114135890 A CN 114135890A CN 202111478576 A CN202111478576 A CN 202111478576A CN 114135890 A CN114135890 A CN 114135890A
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flue gas
outlet
circulating water
working frequency
water pump
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CN114135890B (en
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田雄辉
相晓亮
樊鹏
相朋亮
田晓贺
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Beijing Yunjiang Technology Co ltd
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Beijing Yunjiang Technology Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/04—Arrangement or mounting of control or safety devices for sorption type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/20—Sulfur; Compounds thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention provides a comprehensive flue gas treatment system and a control method thereof, wherein a flue gas inlet of a flue gas cooler is communicated with a main process smoke exhaust channel, a flue gas outlet of the flue gas cooler is communicated with a flue gas inlet of a desulfurizing tower, and a flue gas outlet of the desulfurizing tower is communicated with a chimney; the water inlet and the water outlet of the flue gas cooler are respectively communicated with the water outlet of the generator of the absorption heat pump and the water inlet of the auxiliary heating device; the slurry outlet of the desulfurizing tower is communicated with the slurry inlet of the slurry cooler; the slurry outlet of the slurry cooler is communicated with the slurry inlet of the desulfurizing tower; the water inlet and the water outlet of the slurry cooler are respectively communicated with the water outlet and the water inlet of the evaporator of the absorption heat pump; and the water inlet and the water outlet of the terminal heat exchange device are respectively communicated with the water outlet of the condenser of the absorption heat pump and the water inlet of the absorber of the absorption heat pump, and the terminal heat exchange device is used for realizing the heat exchange between the hot circulating water and the hot user heating medium.

Description

Comprehensive flue gas treatment system and control method thereof
Technical Field
The invention relates to the technical field of industrial energy conservation and environmental protection, in particular to a comprehensive treatment system for flue gas and a control method thereof.
Background
The energy structure of China is characterized by rich coal, poor oil and little gas, which determines that the energy source required by domestic industrial production is mainly coal, and the proportion of total energy consumption is about 70%. The coal-fired flue gas contains a large amount of components such as nitric oxides, oxysulfides, oxycarbides, smoke dust, water and the like, and is a main cause of greenhouse effect and haze in recent years. In order to improve the living environment of the nation, most of domestic coal production processes have successively completed the engineering reconstruction of desulfurization, denitration and dust removal after years of efforts, which plays an important role in improving the air quality. Among them, wet desulfurization is the most widely used desulfurization process in the industry at present due to its advantages of high desulfurization efficiency, high technical maturity, and high stability.
In the wet desulphurization process, the desulphurization and cooling of the flue gas are realized by directly contacting the circulating slurry with the flue gas, however, the water consumption in the whole process is very high, which not only increases the operating cost of enterprises, but also creates conditions for the generation of haze weather; in order to improve the environmental problems such as haze and the like caused by the wet desulphurization process, a great deal of technical research and engineering practice is carried out by a plurality of experts in the industry and research institutions, for example, the processes such as flue gas heat transfer or direct cooling treatment of flue gas are adopted to increase the unsaturation degree of the flue gas or reduce the moisture content of the flue gas. A large number of practices prove that the method can only achieve the effect of relieving the problems to a certain extent, but cannot eliminate the root of the problems, the energy consumption of the whole process is huge, and meanwhile, the running water consumption of the desulfurization process is very large, so that the production and operation cost of enterprises is high, and the sustainable development of the production and operation of industrial enterprises is not facilitated.
Therefore, a more energy-saving comprehensive flue gas treatment system is urgently needed in the market to make up for the defects in the prior engineering technology, and the comprehensive flue gas treatment system and the control method thereof are provided based on the current situation.
Disclosure of Invention
The invention aims to provide a comprehensive flue gas treatment system and a control method thereof, which solve the problems of high energy consumption and large water consumption in desulfurization operation in the existing flue gas treatment technology.
In order to achieve the above object, the present invention provides a comprehensive flue gas treatment system, which comprises: the system comprises an absorption heat pump, a flue gas cooler, a desulfurizing tower, a slurry cooler, a terminal heat exchange device and an auxiliary heating device;
the flue gas inlet of the flue gas cooler is communicated with the main process smoke exhaust channel, the flue gas outlet of the flue gas cooler is communicated with the flue gas inlet of the desulfurizing tower, and the flue gas outlet of the desulfurizing tower is communicated with the inlet of a chimney;
the water inlet of the flue gas cooler is communicated with the water outlet of the generator of the absorption heat pump, and the water outlet of the flue gas cooler is communicated with the water inlet of the auxiliary heating device; and the water outlet of the auxiliary heating device is communicated with the water inlet of the generator of the absorption heat pump. The slurry outlet of the desulfurizing tower is communicated with the slurry inlet of the slurry cooler; and the slurry outlet of the slurry cooler is communicated with the slurry inlet of the desulfurizing tower.
The water inlet of the slurry cooler is communicated with the water outlet of the evaporator of the absorption heat pump, and the water outlet of the slurry cooler is communicated with the water inlet of the evaporator of the absorption heat pump.
The terminal heat exchange device water inlet is communicated with a condenser water outlet of the absorption heat pump, the terminal heat exchange device water outlet is communicated with an absorber water inlet of the absorption heat pump, the terminal heat exchange device is used for achieving heat exchange between hot circulating water and a hot user heat medium, the hot circulating water is the terminal heat exchange device and the circulating water between the absorption heat pump, and the hot user heat medium is a circulating heat carrying medium between the terminal heat exchange device and a hot user.
Optionally, the comprehensive flue gas treatment system further includes: the system comprises a central control device electrically connected with an absorption heat pump, and a first temperature sensor, a first circulating water pump, a flue gas analyzer, a slurry circulating pump, a second temperature sensor and a second circulating water pump which are electrically connected with the central control device;
the first circulating water pump is arranged on a pipeline between the water inlet of the flue gas cooler and the water outlet of the generator of the absorption heat pump;
the first temperature sensor is arranged on a pipeline between a water outlet of the auxiliary heating device and a water inlet of a generator of the absorption heat pump;
the slurry circulating pump is arranged on a pipeline between the slurry outlet of the desulfurization tower and the slurry inlet of the slurry cooler;
the flue gas analyzer is arranged on a flue gas channel connecting the flue gas outlet of the desulfurizing tower with the chimney;
the second circulating water pump is arranged on a pipeline between the water outlet of the terminal heat exchange device and the water inlet of the absorber of the absorption heat pump;
the second temperature sensor is arranged on a pipeline between the water inlet of the terminal heat exchange device and the water outlet of the condenser of the absorption heat pump.
Optionally, the comprehensive flue gas treatment system further includes: the third circulating water pump, the first flue gas moisture content analyzer, the second flue gas moisture content analyzer, the pressure analyzer and the third temperature sensor are electrically connected with the central control device;
the third circulating water pump is arranged on a pipeline between the water inlet of the slurry cooler and the water outlet of the evaporator of the absorption heat pump;
the first flue gas moisture content analyzer and the pressure analyzer are arranged on a flue gas channel communicated with the flue gas outlet of the flue gas cooler and the flue gas inlet of the desulfurizing tower;
the third temperature sensor and the second flue gas moisture content analyzer are arranged on a flue gas channel which is connected with a flue gas outlet and a chimney of the desulfurizing tower.
Corresponding to the comprehensive flue gas treatment system, the invention also provides a control method of the comprehensive flue gas treatment system, which comprises the following steps:
acquiring the water temperature of the generator inlet collected by the first temperature sensor;
comparing the water temperature at the generator inlet with the lower limit of the set temperature of the absorption heat pump driving heat source:
when the water temperature at the generator inlet is higher than or equal to the lower limit of the set temperature of the driving heat source set by the absorption heat pump, no adjustment is made;
when the water temperature at the generator inlet is lower than the lower limit of the temperature set by the absorption heat pump driving heat source, reducing the working frequency of the first circulating water pump through the central control device to increase the water inlet temperature of the generator until the first circulating water pump reaches the minimum safe working frequency;
if the water temperature at the generator inlet is equal to the lower limit of the set temperature of the absorption heat pump driving heat source in the process of adjusting the working frequency of the first circulating water pump by the central control device, stopping adjusting the working frequency of the first circulating water pump;
if the first circulating water pump reaches the minimum safe working frequency, the water temperature at the generator inlet is still lower than the lower limit of the set temperature of the absorption heat pump driving heat source, the auxiliary heating device is started through the central control device, the heating power of the auxiliary heating device is gradually increased, water is heated until the water temperature at the generator inlet is equal to the lower limit of the set temperature of the absorption heat pump driving heat source, and the auxiliary heating device is stopped being adjusted;
acquiring the water temperature at the outlet of the condenser, which is acquired by the second temperature sensor;
comparing the condenser outlet water temperature with the condenser outlet water set temperature lower limit:
when the water temperature at the outlet of the condenser is higher than or equal to the lower limit of the set outlet water temperature of the condenser, no adjustment is made;
when the water temperature at the outlet of the condenser is lower than the lower limit of the water outlet set temperature of the condenser, reducing the working frequency of the second circulating water pump through the central control device so as to increase the water temperature at the outlet of the condenser until the second circulating water pump reaches the minimum safe working frequency;
if the temperature of the water at the outlet of the condenser is equal to the lower limit of the set outlet water temperature of the condenser in the process of adjusting the working frequency of the second circulating water pump by the central control device, stopping adjusting the working frequency of the second circulating water pump;
acquiring the sulfur content of the flue gas collected by the flue gas analyzer;
comparing the flue gas sulfur content to a target sulfur content:
when the sulfur content of the flue gas is equal to the target sulfur content, no adjustment is made;
when the sulfur content of the flue gas is higher than the target sulfur content, increasing the working frequency of the slurry circulating pump through the central control device so as to improve the desulfurization efficiency of the desulfurization tower until the slurry circulating pump reaches the maximum safe working frequency;
when the sulfur content of the flue gas is lower than the target sulfur content, reducing the working frequency of the slurry circulating pump through the central control device so as to save the power consumption of the slurry circulating pump until the minimum safe working frequency of the slurry circulating pump is reached;
and if the flue gas sulfur content is equal to the target sulfur content in the process of adjusting the working frequency of the slurry circulating pump by the central control device, stopping adjusting the working frequency of the slurry circulating pump.
On the other hand, the invention also provides another control method of the comprehensive flue gas treatment system, which corresponds to the comprehensive flue gas treatment system, and the control method comprises the following steps:
acquiring the moisture content of the flue gas at the inlet of the desulfurizing tower collected by the first flue gas moisture content analyzer;
acquiring the flue gas pressure of the inlet of the desulfurizing tower collected by the pressure analyzer;
calculating to obtain a target flue gas temperature according to the moisture content of the flue gas at the inlet of the desulfurizing tower and the pressure of the flue gas at the inlet of the desulfurizing tower;
acquiring the temperature of the flue gas at the outlet of the desulfurizing tower, which is acquired by the third temperature sensor;
comparing the target flue gas temperature with the outlet flue gas temperature of the desulfurizing tower:
when the target flue gas temperature is equal to the outlet flue gas temperature of the desulfurizing tower, no adjustment is made;
when the outlet flue gas temperature of the desulfurizing tower is higher than the target flue gas temperature:
increasing the working frequency of the absorption heat pump through a central control device until the absorption heat pump reaches the maximum safe working frequency;
if the absorption heat pump reaches the maximum safe working frequency, the temperature of the flue gas at the outlet of the desulfurizing tower is still higher than the target temperature of the flue gas, and the working frequency of the first circulating water pump is increased until the first circulating water pump reaches the maximum safe working frequency;
if the first circulating water pump reaches the maximum safe working frequency, the temperature of the flue gas of the desulfurizing tower is still higher than the target temperature of the flue gas, and the working frequency of the second circulating water pump is increased through a central control device until the second circulating water pump reaches the maximum safe working frequency;
if the second circulating water pump reaches the maximum safe working frequency, the temperature of the flue gas at the outlet of the desulfurization tower is still higher than the target temperature of the flue gas, and the working frequency of the third circulating water pump is increased through a central control device until the third circulating water pump reaches the maximum safe working frequency;
when the outlet flue gas temperature of the desulfurizing tower is lower than the target flue gas temperature:
reducing the working frequency of the first circulating water pump by a central control device until the first circulating water pump reaches the minimum safe working frequency;
if the first circulating water pump reaches the minimum safe working frequency, the temperature of the flue gas at the outlet of the desulfurization tower is still lower than the target temperature of the flue gas, and the working frequency of the second circulating water pump is reduced by a central control device until the second circulating water pump reaches the minimum safe working frequency;
if the second circulating water pump reaches the minimum safe working frequency, the temperature of the flue gas at the outlet of the desulfurization tower is still lower than the target temperature of the flue gas, and the working frequency of the third circulating water pump is reduced by a central control device until the third circulating water pump reaches the minimum safe working frequency;
if the third circulating water pump reaches the minimum safe working frequency, the temperature of the flue gas at the outlet of the desulfurizing tower is still lower than the target temperature of the flue gas, and the working frequency of the absorption heat pump is reduced by a central control device until the absorption heat pump reaches the minimum safe working frequency;
if the flue gas temperature at the outlet of the desulfurization tower is equal to the target flue gas temperature in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
Optionally, when the target flue gas temperature is compared with the outlet flue gas temperature of the desulfurization tower, a specific confidence interval is designed according to different practical application scenarios, and the sum of the target flue gas temperature and the confidence interval is compared with the outlet flue gas temperature of the desulfurization tower as a whole.
Corresponding to the comprehensive treatment system for the flue gas, the invention also provides another control method for the comprehensive treatment system for the flue gas, which comprises the following steps:
acquiring the moisture content of the flue gas at the inlet of the desulfurizing tower collected by the first flue gas moisture content analyzer;
acquiring the moisture content of the flue gas at the outlet of the desulfurizing tower collected by the second flue gas moisture content analyzer;
comparing the moisture content of the flue gas at the inlet of the desulfurizing tower with the moisture content of the flue gas at the outlet of the desulfurizing tower:
when the moisture content of the flue gas at the inlet of the desulfurizing tower is equal to that of the flue gas at the outlet of the desulfurizing tower, no adjustment is made;
when the moisture content of the flue gas at the inlet of the desulfurizing tower is lower than that of the flue gas at the outlet of the desulfurizing tower:
increasing the working frequency of the absorption heat pump through a central control device until the absorption heat pump reaches the maximum safe working frequency;
if the absorption heat pump reaches the maximum safe working frequency, the moisture content of the flue gas at the inlet of the desulfurizing tower is still lower than that of the flue gas at the outlet of the desulfurizing tower, and the working frequency of the first circulating water pump is increased through a central control device until the first circulating water pump reaches the maximum safe working frequency;
if the first circulating water pump reaches the maximum safe working frequency, the moisture content of the flue gas at the inlet of the desulfurization tower is still lower than that of the flue gas at the outlet of the desulfurization tower, and the working frequency of the second circulating water pump is increased through a central control device until the second circulating water pump reaches the maximum safe working frequency;
if the second circulating water pump reaches the maximum safe working frequency, the moisture content of the flue gas at the inlet of the desulfurization tower is still lower than that of the flue gas at the outlet of the desulfurization tower, and the working frequency of the third circulating water pump is increased through a central control device until the third circulating water pump reaches the maximum safe working frequency;
if the moisture content of the flue gas at the outlet of the desulfurization tower is equal to that of the flue gas at the inlet of the desulfurization tower in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
When the moisture content of the flue gas at the inlet of the desulfurizing tower is higher than the moisture content of the flue gas at the outlet of the desulfurizing tower:
reducing the working frequency of the first circulating water pump by a central control device until the first circulating water pump reaches the minimum safe working frequency;
if the first circulating water pump reaches the minimum safe working frequency, the moisture content of the flue gas at the inlet of the desulfurization tower is still higher than that of the flue gas at the outlet of the desulfurization tower, and the working frequency of the second circulating water pump is reduced by a central control device until the second circulating water pump reaches the minimum safe working frequency;
if the second circulating water pump reaches the minimum safe working frequency, the moisture content of the flue gas at the inlet of the desulfurization tower is still higher than that of the flue gas at the outlet of the desulfurization tower, and the working frequency of the third circulating water pump is reduced by a central control device until the third circulating water pump reaches the minimum safe working frequency;
if the third circulating water pump reaches the minimum safe working frequency, the moisture content of the flue gas at the inlet of the desulfurization tower is still higher than that of the flue gas at the outlet of the desulfurization tower, and the working frequency of the absorption heat pump is reduced by a central control device until the absorption heat pump reaches the minimum safe working frequency;
if the moisture content of the flue gas at the outlet of the desulfurization tower is equal to that of the flue gas at the inlet of the desulfurization tower in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
Optionally, when the moisture content of the flue gas at the inlet of the desulfurization tower is compared with the moisture content of the flue gas at the outlet of the desulfurization tower, the specific confidence interval is designed according to different practical application scenarios, and the sum of the moisture content of the flue gas at the inlet of the desulfurization tower and the confidence interval is compared with the moisture content of the flue gas at the outlet of the desulfurization tower as a whole.
According to the specific invention content provided by the invention, the invention discloses the following technical effects:
the invention provides a comprehensive flue gas treatment system and a control method thereof, wherein the comprehensive flue gas treatment system comprises an absorption heat pump, a flue gas cooler, a desulfurizing tower, a slurry cooler, a terminal heat exchange device and an auxiliary heating device; the flue gas inlet of the flue gas cooler is communicated with the main process smoke exhaust channel; the flue gas outlet of the flue gas cooler is communicated with the flue gas inlet of the desulfurizing tower, and the flue gas outlet of the desulfurizing tower is communicated with the chimney; the water inlet of the flue gas cooler is communicated with the water outlet of the generator of the absorption heat pump, the water outlet of the flue gas cooler is communicated with the water inlet of the auxiliary heating device, and the water inlet of the generator of the absorption heat pump is communicated with the water outlet of the auxiliary heating device; the slurry outlet of the desulfurizing tower is communicated with the slurry inlet of the slurry cooler; the slurry outlet of the slurry cooler is communicated with the slurry inlet of the desulfurizing tower; the water inlet of the slurry cooler is communicated with the water outlet of the evaporator of the absorption heat pump, and the water outlet of the slurry cooler is communicated with the water inlet of the evaporator of the absorption heat pump; the water inlet of the terminal heat exchange device is communicated with the water outlet of the condenser of the absorption heat pump, the water outlet of the terminal heat exchange device is communicated with the water inlet of the absorber of the absorption heat pump, and the terminal heat exchange device is used for realizing heat exchange between hot circulating water and a hot user heating medium. The invention prepares a large amount of intermediate temperature heat sources which can be used for production or life by utilizing different grades of waste heat resources in the original flue gas treatment process in a cascade way and respectively serving as the high-temperature heat source and the low-temperature heat source of the absorption heat pump, thereby not only realizing the waste heat recovery and utilization of the flue gas waste heat, but also obviously reducing the water consumption of the desulfurization production operation, and having important practical significance for the clean and efficient production and sustainable development of industrial enterprises.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a structural diagram of a comprehensive flue gas treatment system provided in embodiments 1 to 4 of the present invention;
fig. 2 is a flowchart illustrating regulation and control of a first circulating water pump in the control method according to embodiment 5 of the present invention;
fig. 3 is a flowchart of controlling the second circulating water pump in the control method according to embodiment 5 of the present invention;
FIG. 4 is a flow chart of the control of the slurry circulating pump in the control method provided in example 5 of the present invention;
fig. 5 is a flowchart of a control method according to embodiment 6 of the present invention;
fig. 6 is a flowchart of a control method according to embodiment 7 of the present invention.
Description of the symbols: 1-a flue gas cooler; 2-a desulfurizing tower; 3-a chimney; 4-slurry cooler; 5-slurry circulating pump; 6-a third circulating water pump; 7-an absorption heat pump; 8-a first circulating water pump; 9-a second circulating water pump; 10-terminal heat exchange device; 11-auxiliary heating means; 12-a first flue gas moisture content analyzer; 13-a pressure analyzer; 14-a third temperature sensor; 15-flue gas analyzer; 16-a second flue gas moisture content analyzer; 17-a first temperature sensor; 18-second temperature sensor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a comprehensive flue gas treatment system and a control method thereof, which solve the problems of high energy consumption and large water consumption in desulfurization operation in the existing flue gas treatment technology.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1:
as shown in fig. 1, the present invention provides a flue gas comprehensive treatment system, which comprises: the system comprises an absorption heat pump 7, a flue gas cooler 1, a desulfurizing tower 2, a slurry cooler 4, a terminal heat exchange device 10 and an auxiliary heating device 11.
The main process smoke exhaust channel is communicated with a smoke inlet of a smoke cooler 1, a smoke outlet of the smoke cooler 1 is communicated with a smoke inlet of a desulfurizing tower 2, and a smoke outlet of the desulfurizing tower 2 is communicated with a chimney 3; the water inlet of the flue gas cooler 1 is communicated with the water outlet of the generator of the absorption heat pump 7, the water outlet of the flue gas cooler 1 is communicated with the water inlet of the auxiliary heating device 11, and the water inlet of the generator of the absorption heat pump 7 is communicated with the water outlet of the auxiliary heating device 11.
Introducing high-temperature flue gas from a main production process into a flue gas cooler 1, performing heat exchange with low-temperature water from a generator of an absorption heat pump 7, and cooling the high-temperature flue gas by the flue gas cooler 1 and then feeding the high-temperature flue gas into a desulfurizing tower 2 through a flue; the low-temperature water absorbs heat and is heated, then is discharged from a water outlet of the flue gas cooler 1, passes through the auxiliary heating device 11 and then returns to the generator of the absorption heat pump 7 through a pipeline, and is used as a driving heat source of the generator of the absorption heat pump 7.
The slurry outlet of the desulfurizing tower 2 is communicated with the slurry inlet of the slurry cooler 4; the slurry outlet of the slurry cooler 4 is communicated with the slurry inlet of the desulfurization tower 2.
The flue gas from the flue gas cooler 1 after being cooled is in a direct contact mode with cooling slurry from the slurry cooler 4 in the desulfurizing tower 2 to complete the heat and mass transfer process, and the flue gas is discharged into the atmosphere through a chimney 3 after releasing heat and being cooled; and the cooled slurry after absorbing heat enters a slurry cooler 4 from a slurry outlet of the desulfurizing tower 2 through a pipeline.
The water inlet of the slurry cooler 4 is communicated with the water outlet of the evaporator of the absorption heat pump 7, and the water outlet of the slurry cooler 4 is communicated with the water inlet of the evaporator of the absorption heat pump 7.
The heated slurry from the desulfurizing tower 2 exchanges heat with low-temperature water from an evaporator of an absorption heat pump 7 in a slurry cooler 4, and the cooled slurry returns to the desulfurizing tower 2 through a pipeline for recycling; and the low-temperature water absorbs heat and then is introduced into the evaporator of the absorption heat pump 7 through a pipeline to be used as a low-temperature heat source of the evaporator of the absorption heat pump 7.
The water inlet of the terminal heat exchange device 10 is communicated with the water outlet of the condenser of the absorption heat pump 7, the water outlet of the terminal heat exchange device 10 is communicated with the water inlet of the absorber of the absorption heat pump 7, the terminal heat exchange device 10 is used for realizing heat exchange between hot circulating water and a heat medium of a heat user, the hot circulating water is circulating water between the absorption heat pump 7 and the terminal heat exchange device 10, and the heat medium of the heat user is a circulating heat-carrying medium between the heat user and the terminal heat exchange device 10.
The heat circulating water from the condenser of the absorption heat pump 7 exchanges heat with the heat medium from the heat consumer in the terminal heat exchange device 10, the heat medium of the heat consumer absorbs heat and returns to the heat consumer for use, and the heat circulating water after heat release returns to the absorber of the absorption heat pump 7 through a pipeline and is used as a cold source of the absorption heat pump 7.
In the embodiment, waste heat generated by the original flue gas treatment process is recycled in a cascade manner, so that a high-temperature heat source and a low-temperature heat source suitable for the absorption heat pump 7 are obtained, and a large amount of medium-temperature heat sources are generated by the operation of the absorption heat pump 7 and are used for production or life of users.
Example 2:
the specific scheme of this example is basically the same as the scheme of example 1, except that: the comprehensive treatment system for the flue gas further comprises: the system comprises a central control device electrically connected with the absorption heat pump 7, and a first temperature sensor 17, a first circulating water pump 8, a flue gas analyzer 15, a slurry circulating pump 5, a second temperature sensor 18 and a second circulating water pump 9 which are electrically connected with the central control device.
The first circulating water pump 8 is arranged on a pipeline between the water inlet of the flue gas cooler 1 and the generator water outlet of the absorption heat pump 7.
The first temperature sensor 17 is arranged on a pipeline between the water outlet of the auxiliary heating device 11 and the water inlet of the generator of the absorption heat pump 7.
A slurry circulation pump 5 is provided on the pipe between the slurry inlet of the slurry cooler 4 and the slurry outlet of the desulfurization tower 2.
The flue gas analyzer 15 is arranged on a flue gas channel connecting the flue gas outlet of the desulfurizing tower 2 and the chimney 3.
The second circulating water pump 9 is arranged on a pipeline between the water outlet of the terminal heat exchange device 10 and the water inlet of the condenser of the absorption heat pump 7.
The second temperature sensor 18 is arranged on the pipeline between the water inlet of the terminal heat exchange device 10 and the water outlet of the condenser of the absorption heat pump 7.
Example 3:
the specific scheme of this example is basically the same as the scheme of example 2, except that: the comprehensive treatment system for the flue gas further comprises: and the third circulating water pump 6, the first flue gas moisture content analyzer 12, the pressure analyzer 13 and the third temperature sensor 14 are electrically connected with the central control device.
The third circulating water pump 6 is arranged on a pipeline between the water inlet of the slurry cooler 4 and the water outlet of the evaporator of the absorption heat pump 7.
The first flue gas moisture content analyzer 12 and the pressure analyzer 13 are arranged on a flue gas channel communicated with a flue gas outlet of the flue gas cooler 1 and a flue gas inlet of the desulfurizing tower 2.
The third temperature sensor 14 is arranged on a flue gas channel connecting the flue gas outlet of the desulfurizing tower 2 and the chimney 3.
Example 4:
the specific scheme of this example is basically the same as the scheme of example 2, except that: the comprehensive treatment system for the flue gas further comprises: and the third circulating water pump 6, the first flue gas water content analyzer 12 and the second flue gas water content analyzer 16 are electrically connected with the central control device.
The third circulating water pump 6 is arranged on a pipeline between the water inlet of the slurry cooler 4 and the water outlet of the evaporator of the absorption heat pump 7.
The first flue gas moisture content analyzer 12 is arranged on a flue gas channel communicated with a flue gas outlet of the flue gas cooler 1 and a flue gas inlet of the desulfurizing tower 2.
The second flue gas moisture content analyzer 16 is arranged on a flue gas channel connecting the flue gas outlet of the desulfurizing tower 2 and the chimney 3.
Example 5:
corresponding to the comprehensive flue gas treatment system of the embodiment 2, the invention also provides a control method, which comprises the following steps:
as shown in fig. 2, the generator inlet water temperature Tj collected by the first temperature sensor is acquired.
Comparing the generator inlet water temperature Tj with a lower drive heat source set temperature Tj0, wherein the lower drive heat source set temperature Tj0 is determined according to heat pump process parameters:
when the generator inlet water temperature Tj is higher than or equal to the driving heat source set temperature lower limit Tj0, no adjustment is made.
When the water temperature at the inlet of the generator is lower than the lower limit Tj0 of the set temperature of the driving heat source, the working frequency fp8 of the first circulating water pump is reduced by the central control device until the first circulating water pump reaches the minimum safe working frequency fp 80.
If the generator inlet water temperature Tj is equal to the driving heat source set temperature lower limit Tj0 in the frequency adjustment process of the first circulating water pump, the frequency adjustment of the first circulating water pump is stopped.
When the first circulating water pump reaches the minimum safe working frequency fp80, if the water temperature at the generator inlet is still lower than the set lower temperature limit Tj0 of the driving heat source, the auxiliary heating device is started by the central control device for heating, so that the water temperature at the generator inlet reaches the set lower temperature limit Tj0 of the driving heat source, and the heat source of the auxiliary heating device can adopt electric energy or steam.
As shown in fig. 3, the condenser outlet water temperature Ts collected by the second temperature sensor is acquired.
Comparing the condenser outlet water temperature Ts with a condenser outlet water set temperature lower limit Ts0, confirming the condenser outlet water set temperature lower limit Ts0 according to the minimum temperature required by a user:
when the condenser outlet water temperature Ts is higher than or equal to the condenser outlet water set temperature lower limit Ts0, no adjustment is made.
When the outlet water temperature Ts of the condenser is lower than the lower set temperature limit Ts0 of the outlet water of the condenser, the working frequency fp9 of the second circulating water pump is reduced through the central control device until the second circulating water pump reaches the minimum safe working frequency fp 90.
And if the condenser outlet water temperature Ts is equal to the condenser outlet water set temperature lower limit Ts0 in the frequency adjustment process of the second circulating water pump, stopping the frequency adjustment of the second circulating water pump.
As shown in fig. 4, the sulfur content S of the flue gas at the outlet of the desulfurizing tower collected by the flue gas analyzer is obtained.
Comparing the sulfur content S of the flue gas at the outlet of the desulfurizing tower with a target sulfur content S0, wherein the target sulfur content S0 is determined according to local environmental protection standards:
when the sulfur content S of the flue gas at the outlet of the desulfurizing tower is equal to the target sulfur content S0, no adjustment is made.
When the sulfur content S of the flue gas at the outlet of the desulfurizing tower is higher than the target sulfur content S0, increasing the working frequency fp5 of the slurry circulating pump through the central control device until the slurry circulating pump reaches the maximum safe working frequency fp 51.
When the sulfur content S of the flue gas at the outlet of the desulfurizing tower is lower than the target sulfur content S0, the working frequency fp5 of the slurry circulating pump is reduced through a central control device until the slurry circulating pump reaches the minimum safe working frequency fp 50.
And if the sulfur content S of the flue gas at the outlet of the desulfurizing tower is equal to the target sulfur content S0 in the process of adjusting the working frequency of the slurry circulating pump by the central control device, stopping adjusting the working frequency of the slurry circulating pump.
Example 6:
as shown in fig. 5, the present invention also provides a control method corresponding to the comprehensive flue gas treatment system of embodiment 3, including the following steps:
and Vjs for the moisture content of the flue gas at the inlet of the desulfurizing tower collected by the first flue gas moisture content analyzer is obtained.
And acquiring the flue gas pressure Py at the inlet of the desulfurizing tower collected by the pressure analyzer.
Calculating to obtain a target flue gas temperature at the inlet of the desulfurizing tower, namely a target flue gas temperature Ty0, according to the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower and the flue gas pressure Py at the inlet of the desulfurizing tower; the target flue gas temperature Ty0 is calculated from the moisture content of flue gas at the inlet of the desulfurizing tower Vjs and the flue gas pressure Py at the inlet of the desulfurizing tower according to the following formula:
Ty0＝0.0028*(Vjs*(Py+101.325)/100-101.325)^3-0.1639*(Vjs*(Py+101.325)/100-101.325)^2+4.4217*(Vjs*(Py+101.325)/100-101.325)+15.208。
and acquiring the outlet flue gas temperature Ty of the desulfurizing tower collected by the third temperature sensor.
Comparing the target flue gas temperature Ty0 with the outlet flue gas temperature Ty of the desulfurization tower:
when the target flue gas temperature Ty0 and the desulfurization tower flue gas temperature Ty are equal, no adjustment is made.
When the outlet flue gas temperature Ty of the desulfurizing tower is higher than the target flue gas temperature Ty 0:
the operating frequency fp7 of the absorption heat pump is increased by the central control until the absorption heat pump reaches its maximum safe operating frequency fp 71.
If the absorption heat pump reaches the maximum safe working frequency fp71, the outlet flue gas temperature Ty of the desulfurizing tower is still higher than the target flue gas temperature Ty0, and the working frequency fp8 of the first circulating water pump is increased through the central control device until the first circulating water pump reaches the maximum safe working frequency fp 81.
If the first circulating water pump reaches the maximum safe working frequency fp81, the outlet flue gas temperature Ty of the desulfurizing tower is still higher than the target flue gas temperature Ty0, and the working frequency fp9 of the second circulating water pump is increased through the central control device until the second circulating water pump reaches the maximum safe working frequency fp 91.
If the second circulating water pump reaches the maximum safe working frequency fp91, the outlet flue gas temperature Ty of the desulfurizing tower is still higher than the target flue gas temperature Ty0, and the working frequency fp6 of the third circulating water pump is increased through the central control device until the third circulating water pump reaches the maximum safe working frequency fp 61.
If the outlet flue gas temperature Ty of the desulfurizing tower is equal to the target flue gas temperature Ty0 in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
When the outlet flue gas temperature Ty of the desulfurizing tower is lower than the target flue gas temperature Ty 0:
the operating frequency fp8 of the first circulating water pump is reduced by the central control device until the first circulating water pump reaches its minimum safe operating frequency fp 80.
If the first circulating water pump reaches the minimum safe working frequency fp80, the outlet flue gas temperature Ty of the desulfurizing tower is still lower than the target flue gas temperature Ty0, and the working frequency fp9 of the second circulating water pump is reduced through the central control device until the second circulating water pump reaches the minimum safe working frequency fp 90.
If the second circulating water pump reaches the minimum safe working frequency fp90, the outlet flue gas temperature Ty of the desulfurizing tower is still lower than the target flue gas temperature Ty0, and the working frequency fp6 of the third circulating water pump is reduced through the central control device until the third circulating water pump reaches the minimum safe working frequency fp 60.
If the third circulating water pump reaches the minimum safe working frequency fp60, the outlet flue gas temperature Ty of the desulfurizing tower is still lower than the target flue gas temperature Ty0, and the working frequency fp7 of the absorption heat pump is reduced through the central control device until the absorption heat pump reaches the minimum safe working frequency fp 70.
If the outlet flue gas temperature Ty of the desulfurizing tower is equal to the target flue gas temperature Ty0 in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
In order to ensure the stable operation of the system and reduce unnecessary frequent actions, when the target flue gas temperature Ty0 is compared with the outlet flue gas temperature Ty of the desulfurizing tower, a specific confidence interval delta T is designed according to different practical application scenes, and the sum of the target flue gas temperature Ty0 and the confidence interval delta T, namely (Ty0 +/-delta T), is taken as a whole to be compared with the outlet flue gas temperature Ty of the desulfurizing tower.
Example 7:
as shown in fig. 6, the present invention also provides a control method corresponding to the comprehensive flue gas treatment system of embodiment 4, including the following steps:
and Vjs for the moisture content of the flue gas at the inlet of the desulfurizing tower collected by the first flue gas moisture content analyzer is obtained.
And acquiring the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower, which is acquired by the second flue gas moisture content analyzer.
Comparing the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower with the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower:
when the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower is equal to the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower, no adjustment is made.
When the moisture content of the flue gas at the inlet of the desulfurizing tower Vjs is lower than the moisture content of the flue gas at the outlet of the desulfurizing tower Vcs:
the operating frequency fp7 of the absorption heat pump is increased by the central control until the absorption heat pump reaches its maximum safe operating frequency fp 71.
If the absorption heat pump reaches the maximum safe working frequency fp7, the moisture content of the flue gas at the inlet of the desulfurizing tower Vjs is still lower than the moisture content of the flue gas at the outlet of the desulfurizing tower Vcs, and the working frequency fp8 of the first circulating water pump is increased through the central control device until the first circulating water pump reaches the maximum safe working frequency fp 81.
If the first circulating water pump reaches the maximum safe working frequency fp81, the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower is still lower than the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower, and the working frequency fp9 of the second circulating water pump is increased through the central control device until the second circulating water pump reaches the maximum safe working frequency fp 91.
If the second circulating water pump reaches the maximum safe working frequency fp91, the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower is still lower than the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower, and the working frequency fp6 of the third circulating water pump is increased through the central control device until the third circulating water pump reaches the maximum safe working frequency fp 61.
When the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower is lower than the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower:
the operating frequency fp8 of the first circulating water pump is reduced by the central control device until the first circulating water pump reaches its minimum safe operating frequency fp 80.
If the first circulating water pump reaches the minimum safe working frequency fp80, the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower is still lower than the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower, and the working frequency fp9 of the second circulating water pump is reduced by the central control device until the second circulating water pump reaches the minimum safe working frequency fp 90.
If the second circulating water pump reaches the minimum safe working frequency fp90, the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower is still lower than the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower, and the working frequency fp6 of the third circulating water pump is reduced by the central control device until the third circulating water pump reaches the minimum safe working frequency fp 60.
If the third circulating water pump reaches the minimum safe working frequency fp60, the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower is still lower than the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower, and the working frequency fp7 of the absorption heat pump is reduced by the central control device until the absorption heat pump reaches the minimum safe working frequency fp 70.
If the flue gas water content Vcs at the outlet of the desulfurization tower is equal to the flue gas water content Vjs at the inlet of the desulfurization tower in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
In order to ensure the stable operation of the system and reduce unnecessary frequent actions, when the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower is compared with the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower, a specific confidence interval delta V is designed according to different practical application scenes, and the sum of the moisture content Vjs of the flue gas at the inlet of the desulfurizing tower and the confidence interval delta V, namely (Vjs +/-delta V), is taken as a whole to be compared with the moisture content Vcs of the flue gas at the outlet of the desulfurizing tower.
Portions of the technology may be considered "articles" or "articles of manufacture" in the form of executable code and/or associated data, which may be embodied or carried out by a computer readable medium. Tangible, non-transitory storage media may include memory or storage for use by any computer, processor, or similar device or associated module. For example, various semiconductor memories, tape drives, disk drives, or any similar device capable of providing a storage function for software.
All or a portion of the software may sometimes communicate over a network, such as the internet or other communication network. Such communication may load software from one computer device or processor to another. For example: from a server or host computer of the video object detection device to a hardware platform of a computer environment, or other computer environment implementing a system, or similar functionality related to providing information needed for object detection. Thus, another medium capable of transferring software elements may also be used as a physical connection between local devices, such as optical, electrical, electromagnetic waves, etc., propagating through cables, optical cables, air, etc. The physical medium used for the carrier wave, such as an electric, wireless or optical cable or the like, may also be considered as the medium carrying the software. As used herein, unless limited to a tangible "storage" medium, other terms referring to a computer or machine "readable medium" refer to media that participate in the execution of any instructions by a processor.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; those skilled in the art will appreciate that the modules or steps of the invention described above can be implemented using general purpose computing apparatus, or alternatively, they can be implemented using program code executable by computing apparatus, such that it is executed by computing apparatus when stored in a storage device, or separately fabricated into integrated circuit modules, or multiple modules or steps thereof can be fabricated into a single integrated circuit module. The present invention is not limited to any specific combination of hardware and software.
Meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (9)

1. The utility model provides a comprehensive treatment system of flue gas which characterized in that, comprehensive treatment system of flue gas includes: the system comprises an absorption heat pump, a flue gas cooler, a desulfurizing tower, a slurry cooler, a terminal heat exchange device and an auxiliary heating device;
the inlet of the flue gas cooler is communicated with the main process smoke exhaust channel; the flue gas outlet of the flue gas cooler is communicated with the flue gas inlet of the desulfurizing tower, and the flue gas outlet of the desulfurizing tower is communicated with a chimney;
the water inlet of the flue gas cooler is communicated with the water outlet of the generator of the absorption heat pump, the water outlet of the flue gas cooler is communicated with the water inlet of the auxiliary heating device, and the water inlet of the generator of the absorption heat pump is communicated with the water outlet of the auxiliary heating device;
the slurry outlet of the desulfurizing tower is communicated with the slurry inlet of the slurry cooler; the slurry outlet of the slurry cooler is communicated with the slurry inlet of the desulfurizing tower;
the water inlet of the slurry cooler is communicated with the water outlet of the evaporator of the absorption heat pump, and the water outlet of the slurry cooler is communicated with the water inlet of the evaporator of the absorption heat pump;
the terminal heat exchange device water inlet with the condenser delivery port intercommunication of absorption heat pump, terminal heat exchange device delivery port with the absorber water inlet intercommunication of absorption heat pump, terminal heat exchange device is used for realizing the heat exchange of hot circulating water and hot user heat medium, the hot circulating water does absorption heat pump with circulating water between the terminal heat exchange device, hot user heat medium is the circulation heat-carrying medium between terminal heat exchange device and the hot user.
2. The integrated flue gas treatment system of claim 1, further comprising: the system comprises a central control device electrically connected with an absorption heat pump, and a first temperature sensor, a first circulating water pump, a flue gas analyzer, a slurry circulating pump, a second temperature sensor and a second circulating water pump which are electrically connected with the central control device;
the first circulating water pump is arranged on a pipeline between a water inlet of the flue gas cooler and a water outlet of a generator of the absorption heat pump;
the first temperature sensor is arranged on a pipeline between a water outlet of the auxiliary heating device and a water inlet of a generator of the absorption heat pump;
the slurry circulating pump is arranged on a pipeline between the slurry inlet of the slurry cooler and the slurry outlet of the desulfurization tower;
the flue gas analyzer is arranged on a flue gas channel connecting the flue gas outlet of the desulfurizing tower with the chimney;
the second circulating water pump is arranged on a pipeline between the water outlet of the terminal heat exchange device and the water inlet of the absorber of the absorption heat pump;
the second temperature sensor is arranged on a pipeline between a water inlet of the terminal heat exchange device and a water outlet of a condenser of the absorption heat pump.
3. The integrated flue gas treatment system of claim 2, further comprising: the third circulating water pump, the first flue gas moisture content analyzer, the pressure analyzer and the third temperature sensor are electrically connected with the central control device;
the third circulating water pump is arranged on a pipeline between the water inlet of the slurry cooler and the water outlet of the evaporator of the absorption heat pump;
the first flue gas moisture content analyzer and the pressure analyzer are arranged on a flue gas channel communicated with a flue gas outlet of the flue gas cooler and a flue gas inlet of the desulfurizing tower;
and the third temperature sensor is arranged on a flue gas channel connecting the flue gas outlet of the desulfurizing tower and the chimney.
4. The integrated flue gas treatment system of claim 2, further comprising: the third circulating water pump, the first flue gas moisture content analyzer and the second flue gas moisture content analyzer are electrically connected with the central control device;
the third circulating water pump is arranged on a pipeline between the water inlet of the slurry cooler and the water outlet of the evaporator of the absorption heat pump;
the first flue gas moisture content analyzer is arranged on a flue gas channel communicated with a flue gas outlet of the flue gas cooler and a flue gas inlet of the desulfurizing tower;
and the second flue gas moisture content analyzer is arranged on a flue gas channel connected with the flue gas outlet of the desulfurizing tower and the chimney.
5. A control method of a comprehensive flue gas treatment system is applied to the comprehensive flue gas treatment system as claimed in claim 2, and is characterized by comprising the following steps:
acquiring the water temperature of the generator inlet collected by the first temperature sensor;
comparing the generator inlet water temperature to a drive heat source set temperature lower limit:
when the water temperature at the inlet of the generator is higher than or equal to the lower limit of the set temperature of the driving heat source, no adjustment is made;
when the water temperature at the inlet of the generator is lower than the set lower temperature limit of the driving heat source, reducing the working frequency of the first circulating water pump through a central control device until the first circulating water pump reaches the minimum safe working frequency;
if the first circulating water pump reaches the minimum safe working frequency, the water temperature at the generator inlet is still lower than the lower limit of the set temperature of the absorption heat pump driving heat source, the auxiliary heating device is started through the central control device, the heating power of the auxiliary heating device is gradually increased, water is heated until the water temperature at the generator inlet is equal to the lower limit of the set temperature of the absorption heat pump driving heat source, and the auxiliary heating device is stopped being adjusted;
acquiring the water temperature at the outlet of the condenser, which is acquired by the second temperature sensor;
comparing the water temperature at the outlet of the condenser with the lower limit of the water outlet set temperature of the condenser:
when the water temperature at the outlet of the condenser is higher than or equal to the lower limit of the set outlet water temperature of the condenser, no adjustment is made;
when the water temperature at the outlet of the condenser is lower than the lower limit of the water outlet set temperature of the condenser, reducing the working frequency of the second circulating water pump through a central control device until the second circulating water pump reaches the minimum safe working frequency;
acquiring the sulfur content of the flue gas at the outlet of the desulfurizing tower, which is acquired by the flue gas analyzer;
comparing the sulfur content of the flue gas at the outlet of the desulfurizing tower with a target sulfur content:
when the sulfur content of the flue gas at the outlet of the desulfurizing tower is equal to the target sulfur content, no adjustment is made;
when the sulfur content of the flue gas at the outlet of the desulfurization tower is higher than the target sulfur content, the central control device increases the working frequency of the slurry circulating pump until the slurry circulating pump reaches the maximum safe working frequency;
when the sulfur content of the flue gas at the outlet of the desulfurization tower is lower than the target sulfur content, the central control device reduces the working frequency of the slurry circulating pump until the slurry circulating pump reaches the minimum safe working frequency;
and if the sulfur content of the flue gas at the outlet of the desulfurizing tower is equal to the target sulfur content in the process of adjusting the working frequency of the slurry circulating pump by the central control device, stopping adjusting the working frequency of the slurry circulating pump.
6. A control method of a comprehensive flue gas treatment system is applied to the comprehensive flue gas treatment system as claimed in claim 3, and is characterized by comprising the following steps:
acquiring the moisture content of the flue gas at the inlet of the desulfurizing tower collected by the first flue gas moisture content analyzer;
acquiring the flue gas pressure of the inlet of the desulfurizing tower collected by the pressure analyzer;
calculating to obtain a target flue gas temperature according to the moisture content of the flue gas at the inlet of the desulfurizing tower and the pressure of the flue gas at the inlet of the desulfurizing tower;
acquiring the temperature of the flue gas at the outlet of the desulfurizing tower, which is acquired by the third temperature sensor;
comparing the target flue gas temperature with the outlet flue gas temperature of the desulfurizing tower:
when the target flue gas temperature is equal to the outlet flue gas temperature of the desulfurizing tower, no adjustment is made;
when the outlet flue gas temperature of the desulfurizing tower is higher than the target flue gas temperature:
increasing the working frequency of the absorption heat pump through a central control device until the absorption heat pump reaches the maximum safe working frequency;
if the absorption heat pump reaches the maximum safe working frequency, the temperature of the flue gas at the outlet of the desulfurizing tower is still higher than the target temperature of the flue gas, and the working frequency of the first circulating water pump is increased through a central control device until the first circulating water pump reaches the maximum safe working frequency;
if the first circulating water pump reaches the maximum safe working frequency, the temperature of the flue gas at the outlet of the desulfurization tower is still higher than the target temperature of the flue gas, and the working frequency of the second circulating water pump is increased through a central control device until the second circulating water pump reaches the maximum safe working frequency;
if the second circulating water pump reaches the maximum safe working frequency, the temperature of the flue gas at the outlet of the desulfurization tower is still higher than the target temperature of the flue gas, and the working frequency of the third circulating water pump is increased through a central control device until the third circulating water pump reaches the maximum safe working frequency;
when the outlet flue gas temperature of the desulfurizing tower is lower than the target flue gas temperature:
reducing the working frequency of the first circulating water pump by a central control device until the first circulating water pump reaches the minimum safe working frequency;
if the first circulating water pump reaches the minimum safe working frequency, the temperature of the flue gas at the outlet of the desulfurization tower is still lower than the target temperature of the flue gas, and the working frequency of the second circulating water pump is reduced by a central control device until the second circulating water pump reaches the minimum safe working frequency;
if the second circulating water pump reaches the minimum safe working frequency, the temperature of the flue gas at the outlet of the desulfurization tower is still lower than the target temperature of the flue gas, and the working frequency of the third circulating water pump is reduced by a central control device until the third circulating water pump reaches the minimum safe working frequency;
if the third circulating water pump reaches the minimum safe working frequency, the temperature of the flue gas at the outlet of the desulfurizing tower is still lower than the target temperature of the flue gas, and the working frequency of the absorption heat pump is reduced by a central control device until the absorption heat pump reaches the minimum safe working frequency;
if the flue gas temperature at the outlet of the desulfurization tower is equal to the target flue gas temperature in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
7. The control method according to claim 6, wherein when the target flue gas temperature is compared with the outlet flue gas temperature of the desulfurization tower, a specific confidence interval is designed according to different practical application scenarios, and the sum of the target flue gas temperature and the confidence interval is compared with the outlet flue gas temperature of the desulfurization tower as a whole.
8. A control method of a comprehensive flue gas treatment system is applied to the comprehensive flue gas treatment system as claimed in claim 4, and is characterized by comprising the following steps:
acquiring the moisture content of the flue gas at the inlet of the desulfurizing tower collected by the first flue gas moisture content analyzer;
acquiring the moisture content of the flue gas at the outlet of the desulfurizing tower collected by the second flue gas moisture content analyzer;
comparing the moisture content of the flue gas at the inlet of the desulfurizing tower with the moisture content of the flue gas at the outlet of the desulfurizing tower:
when the moisture content of the flue gas at the inlet of the desulfurizing tower is equal to that of the flue gas at the outlet of the desulfurizing tower, no adjustment is made;
when the moisture content of the flue gas at the inlet of the desulfurizing tower is lower than that of the flue gas at the outlet of the desulfurizing tower:
increasing the working frequency of the absorption heat pump through a central control device until the absorption heat pump reaches the maximum safe working frequency;
if the absorption heat pump reaches the maximum safe working frequency, the moisture content of the flue gas at the inlet of the desulfurizing tower is still lower than that of the flue gas at the outlet of the desulfurizing tower, and the working frequency of the first circulating water pump is increased through a central control device until the first circulating water pump reaches the maximum safe working frequency;
if the first circulating water pump reaches the maximum safe working frequency, the moisture content of the flue gas at the inlet of the desulfurization tower is still lower than that of the flue gas at the outlet of the desulfurization tower, and the working frequency of the second circulating water pump is increased through a central control device until the second circulating water pump reaches the maximum safe working frequency;
if the second circulating water pump reaches the maximum safe working frequency, the moisture content of the flue gas at the inlet of the desulfurization tower is still lower than that of the flue gas at the outlet of the desulfurization tower, and the working frequency of the third circulating water pump is increased through a central control device until the third circulating water pump reaches the maximum safe working frequency;
when the moisture content of the flue gas at the outlet of the desulfurizing tower is lower than that of the flue gas at the inlet of the desulfurizing tower:
reducing the working frequency of the first circulating water pump by a central control device until the first circulating water pump reaches the minimum safe working frequency;
if the first circulating water pump reaches the minimum safe working frequency, the moisture content of the flue gas at the outlet of the desulfurization tower is still lower than that of the flue gas at the inlet of the desulfurization tower, and the working frequency of the second circulating water pump is reduced by a central control device until the second circulating water pump reaches the minimum safe working frequency;
if the second circulating water pump reaches the minimum safe working frequency, the moisture content of the flue gas at the outlet of the desulfurization tower is still lower than that of the flue gas at the inlet of the desulfurization tower, and the working frequency of the third circulating water pump is reduced by a central control device until the third circulating water pump reaches the minimum safe working frequency;
if the third circulating water pump reaches the minimum safe working frequency, the moisture content of the flue gas at the outlet of the desulfurization tower is still lower than that of the flue gas at the inlet of the desulfurization tower, and the working frequency of the absorption heat pump is reduced by a central control device until the absorption heat pump reaches the minimum safe working frequency;
if the moisture content of the flue gas at the outlet of the desulfurization tower is equal to that of the flue gas at the inlet of the desulfurization tower in the process of adjusting the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump, the adjustment of the working frequencies of the first circulating water pump, the second circulating water pump, the third circulating water pump and the absorption heat pump is stopped.
9. The control method according to claim 8, wherein when the moisture content of the flue gas at the inlet of the desulfurization tower and the moisture content of the flue gas at the outlet of the desulfurization tower are compared, the sum of the moisture content of the flue gas at the inlet of the desulfurization tower and the confidence interval is compared with the moisture content of the flue gas at the outlet of the desulfurization tower as a whole according to different design specific confidence intervals of practical application scenarios.
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