CN107166417B - Minimum wall temperature control method and system for MGGH system - Google Patents
Minimum wall temperature control method and system for MGGH system Download PDFInfo
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- CN107166417B CN107166417B CN201710556726.7A CN201710556726A CN107166417B CN 107166417 B CN107166417 B CN 107166417B CN 201710556726 A CN201710556726 A CN 201710556726A CN 107166417 B CN107166417 B CN 107166417B
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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
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
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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
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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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
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention discloses a minimum wall temperature control method and a minimum wall temperature control system for an MGGH system, wherein the method automatically compares the difference between the water temperature at the inlet (or the outlet) of a circulating pump of the MGGH system and a setting value, and automatically sends out an instruction to change the frequency of the circulating pump when the water temperature is lower (or higher) than the setting value, so that the circulating water quantity of the MGGH system is increased (or reduced), the circulating water temperature is indirectly increased (or reduced), the minimum working wall temperature of the heating surface of the whole MGGH system is ensured to be controlled above the safe temperature, and the running reliability of the MGGH system under various working conditions is greatly improved.
Description
Technical Field
The invention relates to the technical field of flue gas cooling before power station boiler desulfurization and flue gas heating system after desulfurization, in particular to a minimum wall temperature control method and system of a MGGH system.
Background
According to a thermodynamic calculation formula Q = K F Δ T, wherein Q is heat transfer quantity, K is a heat transfer coefficient, and Δ T is heat transfer temperature and pressure, namely, the transferred heat is directly related to the heat transfer coefficient, the heat transfer area and the heat transfer temperature and pressure, the heat transfer coefficient is related to medium flow rate, the heat transfer area is related to design arrangement, and the heat transfer temperature and pressure is related to inlet and outlet temperatures of cold fluid and hot fluid.
The MGGH system (also called WGGH system, i.e. gas-gas heat exchange system using circulating water as heat medium) absorbs heat in a flue gas cooler by the heat medium water, reduces the temperature of the raw flue gas before desulfurization to a required temperature (the setting temperature of the raw flue gas), sends the cooled flue gas to a low-temperature dust remover or a desulfurization absorption tower, and simultaneously sends the heated heat medium water in the flue gas cooler to a flue gas heater by a circulating pump. In the flue gas heater, heat medium water releases heat, and the purified flue gas after desulfurization is heated to the temperature (emission setting temperature) required by environmental protection and is discharged from a chimney. Considering the manufacturing cost of the whole equipment, in general, the flue gas cooler is designed to be ND steel or carbon steel, and because flue gas before and after desulfurization has certain corrosivity, in order to ensure the safe operation of the equipment, the MGGH system requires that the lowest wall temperature of the heating surface is not lower than a setting value, and the lowest wall temperature of the heating surface is directly and positively correlated with the circulating water temperature, namely the MGGH requires that the lowest circulating water temperature of the flue gas cooler and the flue gas heater is not lower than a certain setting value (normally about 70 ℃).
Because the large-scale boiler of the present power station is a peak shaving unit, the load of the boiler greatly changes according to the requirement, the parameters of the raw flue gas and the clean flue gas entering the MGGH system greatly change, and the whole MGGH can not operate under the designed working condition for a long time.
When the MGGH system is designed, the scale of the whole flue gas cooler and the scale of the flue gas heater are considered according to the maximum output load of a boiler unit, and under the general condition that the unit is changed in load, part of the heating surface is difficult to cut off according to the unit load, so that the operation heating surface of the whole MGGH is unchanged under each load. At each load, the smoke quantity of the whole MGGH increases along with the increase of the load, and the heat exchange capacity of the heating surface also increases along with the increase of the smoke quantity, but the change is not direct 1:1, and at low load, the designed heating surface of the MGGH is relatively rich.
Under the current condition, in order to adapt to the variable load operation of a unit, the MGGH controls the outlet flue gas temperature of the flue gas cooler to be a setting value by adjusting the water amount entering the flue gas cooler, under the low load, because the temperature of the original flue gas of the incoming flow is low, the heat emitted by the flue gas cooler is not enough to heat the desulfurized clean flue gas to the discharge temperature, and the insufficient heat is supplemented by a heat medium water auxiliary steam heater to finally meet the requirement of flue gas discharge.
In conventional control, in order to ensure the normal use of the flue gas cooler of the flue gas heat exchanger, the outlet flue gas temperature of the flue gas cooler is controlled by adjusting the amount of inlet water entering the flue gas cooler, the outlet clean flue gas temperature of the flue gas steam heater is controlled by the auxiliary steam heater, and the outlet raw flue gas temperature of the flue gas cooler and the outlet clean flue gas discharge temperature of the flue gas heater are ensured under the working condition of actual calculation and low load. The heat exchanger heating surface is surplus under the low-load, and flue gas cooler export circulation temperature is higher than the design temperature, and the water yield is less than the design temperature, and flue gas heater's export circulation temperature is less than the design temperature because of excessive exothermic, brings two consequences:
1. because the temperature of the circulating water at the outlet of the flue gas cooler is higher than the design temperature, the total heat required by the auxiliary steam heater is unchanged because the temperature of the incoming water is high, the design temperature and pressure of the auxiliary steam heater are reduced, and the design area of the auxiliary steam heater is increased.
2. After circulation, the water temperature at the outlet of the flue gas heater is lower than a design setting value, and the water temperature at the inlet of the flue gas cooler is lower than the design setting value, so that the risk of low-temperature corrosion of the flue gas cooler and the flue gas heater is brought, and the normal operation service life of the whole MGGH is influenced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a minimum wall temperature control method and system for an MGGH system, ensuring the safe and normal operation of the whole MGGH system, preventing the whole MGGH from being corroded by smoke at low temperature and greatly enhancing the reliability of the whole MGGH system.
In order to solve the technical problems, the invention adopts the technical scheme that:
a minimum wall temperature control method for an MGGH system comprises flue gas temperature control at an outlet of a flue gas cooler of the MGGH system, flue gas temperature control at an outlet of an MGGH flue gas heater and circulating water temperature control of the MGGH system, and comprises the following steps:
MGGH system flue gas cooler outlet flue gas temperature control
Step 101: acquiring the original flue gas temperature at the outlet of the flue gas cooler, and comparing the acquired temperature with a first low setting value and a first high setting value;
step 102: according to the comparison result of the step 101, when the first acquisition temperature is greater than a first low setting value and less than a first high setting value, the system maintains a normal operation state; when the first acquisition temperature is smaller than a first low setting value, automatically and gradually opening the hot coal water circulation bypass regulating valve and automatically closing the main path regulating valve; when the first acquisition temperature is greater than a first high setting value, automatically gradually closing the hot coal water circulation bypass regulating valve and automatically gradually opening the main path regulating valve;
step 103: the step 101 and the step 102 are circulated, and the first acquisition temperature is kept between a first low setting value and a first high setting value;
MGGH flue gas heater outlet flue gas temperature control
Step 201: collecting the clean smoke temperature at the outlet of the smoke heater, and referring the collected temperature as a second collected temperature, and comparing the second collected temperature with a second low setting value and a second high setting value;
step 202: according to the comparison result in the step 201, when the second collection temperature is greater than the second low setting value and less than the second high setting value, the system maintains a normal operation state; when the second acquisition temperature is lower than a second low setting value, automatically gradually opening the opening of the pipeline regulating valve of the auxiliary steam heater; when the second acquisition temperature is greater than a second high setting value, automatically gradually reducing the opening of the pipeline regulating valve of the auxiliary steam heater;
step 203: step 201 and step 202 are circulated, and the second acquisition temperature is kept between a second low setting value and a second high setting value;
circulating water temperature control of MGGH system
Step 301: collecting the temperature of hot coal water at the inlet of the circulating water pump, and comparing the third collected temperature with a third low setting value and a third high setting value;
step 302: according to the comparison result of the step 301, when the third acquisition temperature is greater than the third low setting value and less than the third high setting value, the system maintains a normal operation state; when the third acquisition temperature is lower than a third low setting value, the opening of the bypass valve of the flue gas heater is increased, and the output of the circulating water pump is increased by frequency conversion; when the third acquisition temperature is greater than a third high setting value, the circulating water pump reduces output by frequency conversion;
step 303: and circulating the step 301 and the step 302, and keeping the third collection temperature between a third low setting value and a third high setting value.
According to the scheme, in step 102, if the hot coal water circulation bypass regulating valve and the main path regulating valve cannot work, the system gives an alarm.
According to the scheme, in step 202, if the auxiliary steam heater pipeline adjusting valve cannot work, the system gives an alarm.
According to the scheme, in step 302, if the bypass valve of the flue gas heater cannot work, the system gives an alarm; and if the circulating water pump cannot work, the system gives an alarm.
The utility model provides a minimum wall temperature control system of MGGH system, includes the circulating water temperature control system of MGGH system that sets up on the circulating water route, the structure of circulating water temperature control system is: along the circulating water flowing direction, the circulating pump, the electric gate valve, the water temperature measurer and the flow measurer are connected in sequence; the circulating pump is driven by a variable frequency motor, the variable frequency motor is connected to a signal comparison feedback unit through a control line, and the signal comparison feedback unit is connected to the water temperature measurer.
Further, a check valve is provided between the circulation pump and the electric gate valve.
Furthermore, a first gate valve is arranged at the water inlet end of the circulating pump.
Furthermore, a filter screen is arranged between the circulating pump and the first gate valve.
Compared with the prior art, the invention has the beneficial effects that: the whole MGGH system can be controlled automatically, a thinking way that the circulating water quantity of the MGGH control is reduced under low load is broken through, the smoke temperature at the outlet of a smoke cooler and the smoke temperature at the outlet of a smoke heater under each load can be accurately ensured to be within a setting value range, and the lowest circulating water temperature of the whole MGGH system is not lower than a safely set setting value, so that the whole MGGH system is ensured to run safely and normally, the whole MGGH is not corroded by the low temperature of smoke, and the reliability of the whole MGGH system is greatly enhanced.
Drawings
FIG. 1 is a schematic diagram of an improved MGGH system of the present invention.
FIG. 2 is a schematic diagram of the outlet flue gas temperature control process of the MGGH system flue gas cooler of the present invention.
FIG. 3 is a schematic diagram of the outlet flue gas temperature control process of a flue gas heater of the MGGH system of the present invention.
FIG. 4 is a schematic diagram of a circulating water temperature control process of the MGGH system.
Fig. 5 is a schematic structural diagram of a circulating water temperature control system according to the present invention.
In the figure: 1-a flow measurer; 2-water temperature measurer; 3-a circulating pump; 4, filtering the filter screen; 5-a first gate valve; 6-a second gate valve; 7-circulating water temperature control system; 8-a variable frequency motor; 9-a control line; 10-a signal comparison feedback unit; 11-an electric gate valve; 12-check valve.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
The main idea of the invention is as follows: by collecting a flue gas cooler outlet flue gas temperature comparison setting value and linking with a flue gas cooler main circuit and a bypass regulating valve, when the flue gas cooler outlet flue gas temperature is lower than a design temperature, the opening of the bypass valve is increased and the opening of the main circuit valve is reduced, so that the circulating water quantity entering the flue gas cooler is reduced, and the heat exchange capacity of the flue gas cooler is reduced by reducing the heat transfer temperature and pressure of the flue gas cooler; when the original flue gas temperature at the outlet of the flue gas cooler is higher than the design temperature, the opening degree of the bypass regulating valve is reduced, the opening degree of the main path regulating valve is increased, the quantity of circulating water entering the flue gas cooler is increased, and the main path valve is completely opened until the bypass regulating valve is completely closed.
The circulating water temperature comparison water temperature setting value of an outlet (or an inlet) of the circulating pump is collected and linked with the variable frequency regulation of the circulating water pump, when the circulating water temperature is lower than the setting value, the variable frequency of the circulating water pump is increased, and the whole MGGH circulating water quantity is increased; and conversely, when the circulating water temperature is higher than the setting value, the frequency of the circulating water pump is reduced through frequency conversion, the whole MGGH circulating water quantity is reduced, and the power of the circulating water pump is reduced on the premise of safety, so that energy is saved.
Under low load, when the heat absorbed by the flue gas cooler is insufficient, the circulating water is heated by the auxiliary steam heater for supplement.
Specifically, as shown in fig. 2, when the MGGH is in the design condition, the bypass of the flue gas cooler is in the off state, the main circuit is fully open, the heat emitted by the flue gas cooler is enough to heat the clean flue gas of the flue gas heater to the required temperature for emission, when the unit load is reduced, the inlet flue gas temperature and the inlet flue gas amount of the flue gas cooler are reduced, the heat exchange area of the flue gas cooler is relatively surplus, in order to reduce the heat exchange capacity of the flue gas cooler, the outlet circulating water temperature of the flue gas cooler is increased by increasing the opening degree of the bypass valve and reducing the opening degree of the main circuit valve, so that the heat transfer temperature pressure of the whole flue gas cooler is reduced, and the heat transfer capacity of the flue gas cooler is reduced. And vice versa.
As shown in fig. 3, when the outlet flue gas temperature of the flue gas heater is lower than the setting value, that is, the heat absorbed by the circulating water in the flue gas cooler is not enough to heat the clean flue gas in the flue gas heater to the setting value, the auxiliary steam heater is adjusted to heat the circulating water to supplement heat, when the outlet flue gas temperature of the flue gas heater is higher than the setting value, the auxiliary steam heater inlet steam regulating valve is adjusted to be closed to reduce the auxiliary steam amount (until the auxiliary steam amount is completely closed), and when the outlet flue gas temperature of the flue gas heater is lower than the setting value, the opening degree of the auxiliary steam heater inlet steam regulating valve is increased to increase the auxiliary steam amount.
As shown in fig. 4, by collecting the circulating water temperature at the outlet (or inlet) of the circulating water pump to compare with the water temperature setting value and linking with the circulating water pump frequency conversion regulation, when the circulating water temperature is lower than the setting value, the frequency of the circulating water pump is increased and the whole MGGH circulating water quantity is increased, otherwise, when the circulating water temperature is higher than the setting value, the frequency of the circulating water pump is reduced and the whole MGGH circulating water quantity is reduced, and the power of the circulating water pump is reduced on the premise of safety, so that energy is saved. However, the increased or decreased circulating water amount does not enter the flue gas cooler, the circulating water amount of the flue gas cooler is logically controlled by the logic of fig. 2, fig. 4 is that on the premise of the flue gas temperature control logic at the outlet of the flue gas cooler, the redundant circulating water amount is bypassed to the outlet of the flue gas cooler through a bypass and is mixed with the water coming out of the flue gas cooler, because the water of the bypass is not heated and passes through an auxiliary steam heater logically controlled by the logic of fig. 3, because the water temperature is reduced after the two paths of water are mixed, the heat transfer temperature difference of the auxiliary steam heater is increased, and the design of the auxiliary steam heater is more flexible. Meanwhile, the amount of mixed circulating water is increased, the water temperature entering the flue gas heater is reduced, the total heat quantity to be discharged is unchanged, the heat transfer temperature and pressure of the flue gas heater are reduced, and the circulating water temperature at the outlet of the flue gas heater is increased after corresponding heat quantity is discharged.
As shown in fig. 5, the minimum wall temperature control system of the MGGH system in the present invention comprises a circulating water temperature control system of the MGGH system disposed on a circulating water passage, and the circulating water temperature control system has the structure: along the circulating water flowing direction, a circulating pump 3, an electric gate valve 11, a water temperature measurer 2 and a flow measurer 1 are connected in sequence; the circulating pump 3 is driven by a variable frequency motor 8, the variable frequency motor 8 is connected to a signal comparison feedback unit 10 through a control line 9, and the signal comparison feedback unit 10 is connected to the water temperature measurer 2.
As a modification, a check valve 12 is provided between the circulation pump 3 and the electric gate valve 11. In another improvement, a first gate valve 5 is arranged at the water inlet end of the circulating pump 3.
Claims (8)
1. The minimum wall temperature control method of the MGGH system is characterized by comprising the steps of controlling the flue gas temperature at the outlet of a flue gas cooler of the MGGH system, controlling the flue gas temperature at the outlet of a flue gas heater of the MGGH system and controlling the circulating water temperature of the MGGH system, and comprises the following steps:
MGGH system flue gas cooler outlet flue gas temperature control
Step 101: collecting the original flue gas temperature at the outlet of a flue gas cooler, taking the collected temperature as a first collected temperature, and comparing the first collected temperature with a first low setting value and a first high setting value;
step 102: according to the comparison result in the step 101, when the first acquisition temperature is greater than a first low setting value and less than a first high setting value, the system maintains a normal operation state; when the first acquisition temperature is lower than a first low setting value, automatically and gradually opening the hot coal water circulation bypass regulating valve and automatically closing the main path regulating valve; when the first acquisition temperature is greater than a first high setting value, automatically gradually closing the hot coal water circulation bypass regulating valve and automatically gradually opening the main path regulating valve;
step 103: the step 101 and the step 102 are circulated, and the first acquisition temperature is kept between a first low setting value and a first high setting value;
MGGH flue gas heater outlet flue gas temperature control
Step 201: collecting the clean smoke temperature at the outlet of the smoke heater, taking the collected temperature as a second collected temperature, and comparing the second collected temperature with a second low setting value and a second high setting value;
step 202: according to the comparison result in the step 201, when the second collection temperature is greater than the second low setting value and less than the second high setting value, the system maintains a normal operation state; when the second acquisition temperature is lower than a second low setting value, automatically gradually opening the opening of the pipeline regulating valve of the auxiliary steam heater; when the second acquisition temperature is greater than a second high setting value, automatically gradually reducing the opening of the pipeline regulating valve of the auxiliary steam heater;
step 203: step 201 and step 202 are circulated, and the second acquisition temperature is kept between a second low setting value and a second high setting value;
circulating water temperature control of MGGH system
Step 301: collecting the temperature of hot coal water at the inlet of the circulating water pump, and comparing the third collected temperature with a third low setting value and a third high setting value;
step 302: according to the comparison result of the step 301, when the third acquisition temperature is greater than the third low setting value and less than the third high setting value, the system maintains a normal operation state; when the third acquisition temperature is lower than a third low setting value, the opening of a bypass valve of the flue gas heater is increased, the output is increased by the frequency conversion of a circulating water pump, and the whole MGGH circulating water quantity is increased; when the third acquisition temperature is greater than a third high setting value, the output of the circulating water pump is reduced through frequency conversion, the whole MGGH circulating water quantity is reduced, and the power of the circulating water pump is reduced on the premise of safety to save energy; under the logical premise of controlling the smoke temperature at the outlet of the smoke cooler, the redundant circulating water is bypassed to the outlet of the smoke cooler through a bypass to be mixed with the water from the smoke cooler, and then the mixed water passes through an auxiliary steam heater; step 303: and circulating the step 301 and the step 302, and keeping the third collection temperature between a third low setting value and a third high setting value.
2. The method as claimed in claim 1, wherein the system alarms if the hot coal water circulation bypass regulating valve and the main path regulating valve are out of operation in step 102.
3. The method of claim 1 wherein in step 202 the system alarms if the auxiliary steam heater line regulator valve is not operational.
4. The method as claimed in claim 1, wherein in step 302, if the bypass valve of the flue gas heater is not operated, the system alarms; and if the circulating water pump cannot work, the system gives an alarm.
5. A control system adopting the minimum wall temperature control method of the MGGH system as defined in any one of claims 1 to 4, comprising a circulating water temperature control system of the MGGH system disposed on a circulating water path, wherein the circulating water temperature control system is structured as follows: along the circulating water flowing direction, a circulating pump (3), an electric gate valve (11), a water temperature measurer (2) and a flow measurer (1) are connected in sequence; the circulating pump (3) is driven by a variable frequency motor (8), the variable frequency motor (8) is connected to a signal comparison feedback unit (10) through a control line (9), and the signal comparison feedback unit (10) is connected to the water temperature measurer (2).
6. Control system according to claim 5, characterized in that a non-return valve (12) is arranged between the circulation pump (3) and an electric gate valve (11).
7. Control system according to claim 5, characterized in that a first gate valve (5) is arranged at the water inlet end of the circulation pump (3).
8. Control system according to claim 7, characterized in that a filter screen (4) is arranged between the circulation pump (3) and the first gate valve (5).
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