CN114353040A - Control system and method for heat rejection load of steam extraction heat supply unit - Google Patents
Control system and method for heat rejection load of steam extraction heat supply unit Download PDFInfo
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- 239000003245 coal Substances 0.000 claims description 54
- 238000012545 processing Methods 0.000 claims description 21
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Abstract
The invention discloses a control system and a method for a heat load shedding of a steam extraction heat supply unit, which comprises an acquisition module, wherein the acquisition module is used for acquiring an actual input flow value of coal dust entering a hot press, setting the actual flow value as a first flow value, setting a rated coal dust input flow value of the hot press as a second flow value, and converting the first flow value and the second flow value into a first heat load value and a second heat load value; can break down in the hot press and cause instantaneous energy unbalance suddenly like factors such as hot press tripping operation, lead to hot press, steam turbine load to mismatch, steam pressure rises suddenly, reheat steam temperature drops suddenly etc. when leading to appearing getting rid of the hot phenomenon, adjust the heating capacity of hot press, reduce to get rid of the influence of hot phenomenon to the hot press, guarantee the stable heat supply of hot press, avoid getting rid of hot phenomenon and influence unit safety, arouse even that the non-stop accident appears.
Description
Technical Field
The invention relates to the technical field of steam extraction and heat supply units, in particular to a system and a method for controlling heat throwing load of a steam extraction and heat supply unit.
Background
With the reform of energy structures in China, the proportion of new energy power generation is increased continuously, the output of a thermal power generating unit is reduced greatly, and the cost of coal consumption, power consumption and the like is increased in long-term low-load operation. The hot press is adopted to extract steam from the steam extraction system of the thermal power generating unit or the main and reheat steam systems for heat and power coupling.
After the thermal coupling is reformed, if the heat supply equipment breaks down, such as factors such as tripping of a hot press suddenly cause instant energy unbalance, the loads of the hot press and a steam engine are not matched, the steam pressure suddenly rises, the temperature of reheated steam suddenly drops, and the like, namely, the heat rejection phenomenon seriously influences the safety of a unit, and even causes non-stop accidents. Mishandling can also cause significant losses to hot users. The same problem is faced when the hot user side presents a problem, requiring an emergency interruption of steam supply.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
Therefore, the technical problems to be solved by the invention are as follows: when the heat supply equipment is in failure, such as tripping of a hot press and other factors, sudden energy imbalance is caused, so that loads of the hot press and a steam engine are not matched, steam pressure is suddenly increased, the temperature of reheated steam is suddenly reduced, and the like. The safety of the unit is seriously influenced, and even non-stop accidents are caused.
In order to solve the technical problems, the invention provides the following technical scheme: a control system for a heat load shedding of an extraction and heat supply unit comprises an acquisition module, wherein the acquisition module is used for acquiring an actual input flow value of coal powder entering a hot press, setting the actual flow value as a first flow value, setting a rated coal powder input flow value of the hot press as a second flow value, and converting the first flow value and the second flow value into a first heat load value and a second heat load value; the control module is internally provided with a thermal load threshold in advance, obtains a thermal load difference value by comparing the first thermal load value with the second thermal load value, compares the thermal load difference value with the thermal load threshold, and sends a control instruction according to the comparison; and the execution module adjusts the actual input flow value of the hot press according to the control command.
As a preferred scheme of the control system for the heat load shedding of the steam extraction and heat supply unit, the invention comprises the following steps: the acquisition module comprises a first flowmeter and a processing chip, the first flowmeter is arranged at the pulverized coal inlet end of the hot press for detection to obtain a first flow value, the first flow value is input to the processing chip, the processing chip calculates to obtain a first heat load value according to the first flow value, and transfers an internal second flow value to calculate the second flow value to obtain a second heat load value.
As a preferred scheme of the control system for the heat load shedding of the steam extraction and heat supply unit, the invention comprises the following steps: the control module comprises a subtracter and a controller, the processing chip inputs the first thermal load value and the second thermal load value into the subtracter, calculates a thermal load difference value of the first thermal load value and the second thermal load value through the subtracter, and inputs the thermal load difference value into the controller, and a thermal load threshold is preset in the controller and is compared with the thermal load difference value; when the thermal load threshold is larger than the thermal load difference, the controller sends a first instruction; and when the heat load threshold is smaller than the heat load difference value, the controller sends out a second instruction.
As a preferred scheme of the control system for the heat load shedding of the steam extraction and heat supply unit, the invention comprises the following steps: the execution module comprises a coal feeder and a receiver, the receiver can receive a first instruction and a second instruction, and the receiver is electrically connected with the coal feeder and inputs the first instruction and the second instruction to the coal feeder.
As a preferred scheme of the control system for the heat load shedding of the steam extraction and heat supply unit, the invention comprises the following steps: and after the coal feeder receives the first instruction, the opening degree of an air door of the coal feeder is reduced, and after the coal feeder receives the first instruction, the opening degree of the air door of the coal feeder is increased.
As a preferred scheme of the control method for the heat load shedding of the steam extraction and heat supply unit, the method comprises the following steps: a control system for heat load shedding of a steam extraction and heat supply unit comprises: acquiring an actual input flow value of the amount of the coal dust entering the hot press through an acquisition module, and setting the actual flow value as a first flow value; setting a rated coal powder input flow value of the hot press as a second flow value, and converting the first flow value and the second flow value into a first thermal load value and a second thermal load value; presetting a thermal load threshold in the control module, and comparing the first thermal load value with the second thermal load value to obtain a thermal load difference value; comparing the heat load difference value with a heat load threshold value, and sending a control instruction according to a comparison result; and the execution module adjusts the actual input flow value of the hot press according to the control command.
As a preferred scheme of the control method for the heat load shedding of the steam extraction and heat supply unit, the method comprises the following steps: arranging a first flowmeter at the coal dust inlet end of the hot press for detection to obtain a first flow value; the first flow value is input into a processing chip, and the processing chip calculates to obtain a first heat load value according to the first flow value; the processing chip calls an internal second flow value and calculates the second flow value to obtain a second heat load value; and calculating the thermal load difference value of the first thermal load value and the second thermal load value through a subtracter.
As a preferred scheme of the control method for the heat load shedding of the steam extraction and heat supply unit, the method comprises the following steps: dividing the heat-shedding load into a user side heat-shedding load and a unit side heat-shedding load according to different positions of the heat-shedding load; comparing the thermal load threshold controller with a thermal load threshold preset in the controller; when the heat load threshold is larger than the heat load difference value, judging that the heat load is thrown from the user side, and sending a first instruction by the controller; and when the heat load threshold is smaller than the heat load difference value, judging that the heat load is thrown from the unit side, and sending a second instruction by the controller.
As a preferred scheme of the control method for the heat load shedding of the steam extraction and heat supply unit, the method comprises the following steps: the controller simultaneously inputs a first instruction and a second instruction to the air supply fan and the fuel gun.
As a preferred scheme of the control method for the heat load shedding of the steam extraction and heat supply unit, the method comprises the following steps: the opening degree of the air door is reduced after the air supply fan and the fuel gun receive a first instruction through the receivers correspondingly arranged on the air supply fan and the fuel gun; and the opening degree of the air door is increased after the air supply fan and the fuel gun receive the second instruction.
The invention has the beneficial effects that: after the coal feeder receives the first instruction, the opening degree of an air door of the coal feeder is reduced, the input flow of pulverized coal is reduced, the calorific value of a hot press is reduced, after the coal feeder receives the first instruction, the opening degree of the air door of the coal feeder is increased, the input flow of the pulverized coal is increased, the calorific value of the hot press is increased, instantaneous energy unbalance can be suddenly caused by factors such as tripping of the hot press when the hot press breaks down, the loads of the hot press and a steam engine are not matched, the steam pressure is suddenly increased, the temperature of reheated steam is suddenly reduced, and the like, so that when the heat throwing phenomenon occurs, the heat supply capacity of the hot press is adjusted, the influence of the heat throwing phenomenon on the hot press is reduced, the stable heat supply of the hot press is ensured, the safety of a unit is prevented from being influenced by the heat throwing phenomenon, and even non-stop accidents occur.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced 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 based on these drawings without inventive exercise. Wherein:
FIG. 1 is a schematic diagram showing the connection of an acquisition module, a control module and an execution module according to the present invention.
Fig. 2 is a schematic diagram of a total negative heat supply calculation process according to the present invention.
FIG. 3 is a logic diagram of the thermal load coordination control compensation in the present invention.
Fig. 4 is a schematic diagram of a calculation flow of the heat rejection load amount in the present invention.
FIG. 5 is a logic diagram of heat dump load determination in the present invention.
Fig. 6 is a schematic diagram of the control of the damper in the heat dump load according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1 and 2, for a first embodiment of the present invention, the embodiment provides a system and a method for controlling a heat rejection load of an extraction heat supply unit, including an acquisition module 100, a control module 200, and an execution module 300, where the acquisition module 100 is configured to acquire an actual input flow value of coal powder entering a hot press, set the actual flow value as a first flow value, set a rated coal powder input flow value of the hot press as a second flow value, convert the first flow value and the second flow value into a first heat load value and a second heat load value, and calculate an actual heat supply amount of the hot press by using the actual input flow value of coal powder, an average heating value of coal powder, and a conversion power of the hot press.
A thermal load threshold is preset in the control module 200, a thermal load difference value is obtained by comparing the first thermal load value with the second thermal load value, the thermal load difference value is compared with the thermal load threshold, and a control instruction is sent out according to the comparison; the first thermal load value and the second thermal load value can be compared, when the thermal load difference value is a negative value, the actual heat supply amount of the hot press is smaller than the rated heat supply amount, when the thermal load difference value is a positive value, the actual heat supply amount of the hot press is smaller than the rated heat supply amount, and the control module 200 can send out a control instruction according to a comparison result of the first thermal load value and the second thermal load value. The execution module 300 adjusts the actual input flow value of the hot press according to the control instruction, the actual heat supply of the hot press is smaller than the rated heat supply, the pulverized coal input flow of the hot press is increased, and the actual heat supply of the hot press is larger than the rated heat supply, and the pulverized coal input flow of the hot press is reduced.
The acquisition module 100 includes a first flowmeter 101 and a processing chip 102, the first flowmeter 101 is arranged at a pulverized coal inlet end of a hot press for detection to obtain a first flow value, the first flow value is input to the processing chip 102, and the processing chip 102 may adopt an existing metering chip, such as: the processing chip 102 with the model number of HLW8012 calculates to obtain a first thermal load value according to the first flow value, and obtains an internal second flow value, and calculates to obtain a second thermal load value.
The control module 200 comprises a subtracter 201 and a controller 202, the processing chip 102 inputs the first thermal load value and the second thermal load value into the subtracter 201, calculates a thermal load difference value of the first thermal load value and the second thermal load value through the subtracter 201, and inputs the thermal load difference value into the controller 202, and a thermal load threshold value is preset in the controller 202 and is compared with the thermal load difference value; when the thermal load threshold is greater than the thermal load difference, the controller 202 issues a first instruction; when the thermal load threshold is less than the thermal load difference, the controller 202 issues a second command, and the controller 202 is an existing (microcontroller), such as the controller 202 of model number STM32F103R8T 6.
The execution module 300 includes a coal feeder 301 and a receiver 302, the receiver 302 is capable of receiving a first command and a second command, the receiver 302 may be a signal receiver with model number MK245 NANO for receiving the first command and the second command sent by the controller 202, and the receiver 302 is electrically connected to the coal feeder 301 and inputs the first command and the second command to the coal feeder 301.
After the coal feeder 301 receives the first instruction, the opening degree of the air door of the coal feeder 301 is reduced, the input flow of pulverized coal is reduced, the heat productivity of the hot press is reduced, after the coal feeder 301 receives the first instruction, the opening degree of the air door of the coal feeder 301 is increased, the input flow of the pulverized coal is increased, the heat productivity of the hot press is increased, instantaneous energy imbalance can be suddenly caused by factors such as tripping of the hot press when the hot press breaks down, the hot press is enabled to be unmatched with the load of the steam engine, the steam pressure is suddenly increased, the temperature of reheated steam is suddenly reduced, the heat throwing phenomenon is caused, the heat supply capacity of the hot press is adjusted, the influence of the heat throwing phenomenon on the hot press is reduced, the stable heat supply of the hot press is guaranteed, the safety of a unit is prevented from being influenced by the heat throwing phenomenon, and even non-stop accidents are caused to occur.
Example 2
Referring to fig. 3 to 6, a second embodiment of the present invention is a system for controlling a heat load rejection of an extraction heating unit, which includes:
s1, acquiring an actual input flow value of the amount of the coal dust entering the hot press through the acquisition module 100, and setting the actual flow value as a first flow value;
s2, the processing chip 102 calculates a first thermal load value according to the first flow value;
s3, the processing chip 102 calls the internal second flow value and calculates the second flow value to obtain a second heat load value;
a thermal load difference of the first thermal load value and the second thermal load value is calculated by the subtractor 201S 4.
S5, setting a rated coal powder input flow value of the hot press as a second flow value, and converting the first flow value and the second flow value into a first heat load value and a second heat load value;
s6, presetting a heat load threshold in the control module 200, and comparing the first heat load value with the second heat load value to obtain a heat load difference value;
s7, comparing the thermal load threshold controller 202 with a thermal load threshold preset in the controller 202; when the thermal load threshold is greater than the thermal load difference, the controller 202 issues a first instruction;
and S8, when the heat load threshold is smaller than the heat load difference, judging that the heat load is thrown by the unit side, and sending a second instruction by the controller 202.
S9, after the coal feeder 301 receives the first instruction, the opening degree of the air door of the coal feeder 301 is reduced, and after the coal feeder 301 receives the first instruction, the opening degree of the air door of the coal feeder 301 is increased
S10, the controller 202 inputs the first command and the second command to the blower 303 and the fuel gun 304 at the same time.
S11, after the air supply fan 303 and the fuel gun 304 receive a first instruction through the corresponding receiver 302, the opening degree of the air door is reduced; the air feeder 303 and the fuel gun 304 increase the degree of opening of the damper by receiving the second instruction.
Example 2
Referring to fig. 3 to 6, a second embodiment of the present invention is based on the previous embodiment, and is used specifically; because the load of the hot press is equal to the sum of the total heat supply load and the electric load after heat supply is input, when the unit operates in a CCS control mode, the main steam pressure is adjusted by the main control closed loop of the hot press, the electric load is automatically adjusted by the high-level adjustment of the steam turbine, and the hot steam pressure is automatically adjusted by the medium-level adjustment of the steam turbine; the coal powder input quantity and the water supply flow quantity need to be superposed by heat supply load compensation quantity. When a heat load is thrown, the load of a hot press, the set values of water and coal and the like need to be adjusted in time according to the heat load variable quantity, so that the total heat supply load needs to be accurately calculated at first.
The total heat supply load is obtained by adding the heat load of a single hot press according to the input quantity of pulverized coal at the respective inlets of the hot presses A, B (two hot presses or one hot press can be used in the actual production) and the overheating load quantity of the hot presses and the reheating load quantity of the hot presses, and adding the heat loads of the two hot presses.
According to the position difference of getting rid of the heat load, divide into getting rid of the heat load: the user side gets rid of the heat load and the unit side gets rid of the heat load. Under the condition of operation and after the flow rate is greater than a certain value, the hot press is judged to be a heat-removal load at the unit side due to self-protection action tripping; similarly, when the hot press is in operation and the flow is larger than a certain value, the two-out-of-three actions are carried out when the flow of the outlet of the hot press, the reheating steam supply flow of the hot press and the reduction rate of the flow of the heat supply main pipe are larger than certain values (the flows are continuously reduced for 2s, 4s and 6s and exceed certain values) or the pressure of the outlet of the hot press is higher than certain values, and the heat-throwing load on the user side is judged. The heat-throwing load on the unit side is the heat-throwing load 1 of the hot press A, and the heat-throwing load on the user side is the heat-throwing load 2 of the hot press B.
When the hot press is in an automatic control mode, the default regulating flow is rated flow, the hot press A is 200t/h, and the hot press B is 100 t/h; when the hot press is in a manual control mode, the flow is adjusted to be the current actual flow.
And if the hot press throws the load 1, the hot press trips. The hot press can adjust the flow rate and cut to 0; if the hot press throws the load 2, the hot press can adjust the flow and cut to the actual flow.
The total available heating load is the sum of the current adjustable flow converted heat loads of thermocompressor A, B. When the load shedding action is performed, the total load with heat supply is calculated as follows:
when the load shedding 1 of the hot press A occurs, the total load can be supplied with heat, and the heat load can be converted into the heat load by the adjustable flow of the hot press B;
when the load shedding 1 of the hot press B occurs, the total load can be supplied with heat, and the heat load can be converted into the heat load by the adjustable flow of the hot press A;
when the load shedding 2 of the hot press A, B, namely the load shedding on the user side, occurs, the total heating load can be converted into the heat load by the sum of the actual flow rates of the hot press A, B.
And (3) judging heat load shedding action: judging that the hot press throws heat load action when the deviation between the hot press available flow and the actual flow of the hot press is greater than a certain value; and when the deviation between the hot press available flow and the actual flow of the hot press is smaller than a certain value, judging that the heat-throwing load of the hot press is finished, and resetting a heat-throwing load action signal.
Coordinated control during heat load shedding
In the coordinated control, the load signal is applied to variable parameters of water-coal ratio regulation, oxygen regulation and steam temperature regulation, and the setting of the opening degree of a burnout air door, the main steam pressure and the like. When heat supply is put into use, the load signal is an electric load heating load. The change of heat load influences the regulation quality of each control system, and when getting rid of heat load and taking place, the total load of heat supply can change in the twinkling of an eye, in order to maintain each system stable, the total load of heat supply needs timely and steady transition. Thus, the rate of heat load reduction is changed when the press is operated to dump load. The fuel and water settings are compensated by the total load available for heating.
In order to maintain the reheating pressure to reach the heat supply requirement after the heat supply is put into use, the pressure control of the intermediate regulating valve can be added, and the following judgment is made on the intermediate regulating valve when the hot press throws the load:
only one hot press is in operation and load shedding 1 occurs, and pressure control is automatically cut off;
when the two hot presses operate, one hot press generates load shedding 1 and keeps pressure control automatic;
load shedding 1 occurs when the two hot presses run, and the pressure control is automatically cut off;
when the two hot presses are stopped, the pressure control is automatically cut off.
When the control of the reheating pressure is cut off, the middle throttle is fully opened according to a certain speed, the opening speed is adjusted according to the ratio of the inlet-outlet pressure difference of the reheater to the outlet pressure difference before load shedding, the opening speed is slow when the ratio is large, and the opening speed is fast when the ratio is small.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or system and method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. The utility model provides a control system that heat load was got rid of to steam extraction heat supply unit which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the system comprises an acquisition module (100), a control module and a control module, wherein the acquisition module (100) is used for acquiring an actual input flow value of the amount of the coal dust entering the hot press, setting the actual flow value as a first flow value, setting a rated coal dust input flow value of the hot press as a second flow value, and converting the first flow value and the second flow value into a first heat load value and a second heat load value;
the control system comprises a control module (200), wherein a heat load threshold value is preset in the control module (200), a heat load difference value is obtained by comparing a first heat load value with a second heat load value, the heat load difference value is compared with the heat load threshold value, and a control instruction is sent out according to the comparison;
and the execution module (300) is used for adjusting the actual input flow value of the hot press according to the control command.
2. The system for controlling the heat rejection load of a steam extraction and heat supply unit of claim 1, wherein: the acquisition module (100) comprises a first flowmeter (101) and a processing chip (102), the first flowmeter (101) is arranged at the pulverized coal inlet end of the hot press to be detected to obtain a first flow value, the first flow value is input to the processing chip (102), the processing chip (102) calculates to obtain a first heat load value according to the first flow value, and obtains an internal second flow value to calculate the second flow value to obtain a second heat load value.
3. The system for controlling the heat rejection load of a steam extraction and heat supply unit according to claim 2, wherein: the control module (200) comprises a subtracter (201) and a controller (202), the processing chip (102) inputs the first thermal load value and the second thermal load value into the subtracter (201), calculates a thermal load difference value of the first thermal load value and the second thermal load value through the subtracter (201), and inputs the thermal load difference value into the controller (202), a thermal load threshold value is preset in the controller (202), and the thermal load threshold value is compared with the thermal load difference value;
when the thermal load threshold is greater than the thermal load difference, the controller (202) issues a first instruction;
when the thermal load threshold is less than the thermal load difference, the controller (202) issues a second command.
4. A control system for the heat load rejection of a steam extraction heating unit as set forth in claim 3, wherein: the execution module (300) comprises a coal feeder (301) and a receiver (302), wherein the receiver (302) can receive a first instruction and a second instruction, and the receiver (302) is electrically connected with the coal feeder (301) and inputs the first instruction and the second instruction to the coal feeder (301).
5. The system for controlling the heat rejection load of a steam extraction and heat supply unit according to claim 4, wherein:
after the coal feeder (301) receives the first instruction, the opening degree of an air door of the coal feeder (301) is reduced;
and after the coal feeder (301) receives the first instruction, the opening degree of a damper of the coal feeder (301) is increased.
6. A control method for heat load shedding of a steam extraction heat supply unit is characterized by comprising the following steps:
acquiring an actual input flow value of the amount of the pulverized coal entering the hot press through an acquisition module (100), and setting the actual flow value as a first flow value;
setting a rated coal powder input flow value of the hot press as a second flow value, and converting the first flow value and the second flow value into a first thermal load value and a second thermal load value;
presetting a heat load threshold in a control module (200), and comparing a first heat load value with a second heat load value to obtain a heat load difference value;
comparing the heat load difference value with a heat load threshold value, and sending a control instruction according to a comparison result;
and the execution module (300) adjusts the actual input flow value of the hot press according to the control instruction.
7. The method for controlling the heat load rejection of the steam extraction heating unit according to claim 6, wherein:
arranging a first flowmeter (101) at the pulverized coal inlet end of the hot press for detection to obtain a first flow value;
the first flow value is input into the processing chip (102), and the processing chip (102) calculates a first thermal load value according to the first flow value;
the processing chip (102) calls an internal second flow value, and calculates the second flow value to obtain a second heat load value;
a thermal load difference between the first thermal load value and the second thermal load value is calculated by a subtractor (201).
8. The method for controlling the heat load rejection of the steam extraction heating unit according to claim 7, wherein:
dividing the heat-shedding load into a user side heat-shedding load and a unit side heat-shedding load according to different positions of the heat-shedding load;
comparing, by the controller (202), the thermal load threshold controller (202) to an internal pre-set thermal load threshold;
when the heat load threshold is larger than the heat load difference value, judging that the heat load is thrown from the user side, and sending a first instruction by the controller (202);
and when the heat load threshold is smaller than the heat load difference, judging that the heat load is thrown from the unit side, and sending a second command by the controller (202).
9. The method for controlling the heat load rejection of the steam extraction heating unit according to claim 8, wherein:
the controller (202) inputs the first command and the second command to the air supply fan (303) and the fuel gun (304) at the same time.
10. The method for controlling the heat load rejection of the steam extraction heating unit according to claim 9, wherein: after the air supply fan (303) and the fuel gun (304) receive a first instruction through a receiver (302) arranged correspondingly, the opening degree of the air door is reduced;
the air supply fan (303) and the fuel gun (304) increase the opening degree of the air door after receiving the second instruction.
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