CN115751277A - Control method and device for combined steam supply of water tube boiler and through-flow boiler - Google Patents
Control method and device for combined steam supply of water tube boiler and through-flow boiler Download PDFInfo
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- CN115751277A CN115751277A CN202211252833.8A CN202211252833A CN115751277A CN 115751277 A CN115751277 A CN 115751277A CN 202211252833 A CN202211252833 A CN 202211252833A CN 115751277 A CN115751277 A CN 115751277A
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Abstract
The invention provides a control method and a device for combined steam supply of a water tube boiler and a through-flow boiler, which are used for obtaining a pressure difference value in unit time, entering a double-regulation mode if the difference between a pressure change threshold value and the pressure difference value is greater than zero, and entering a single-regulation mode if the difference is not greater than zero; in a double regulation mode, regulating the steam outflow of the through-flow boiler until the difference between the pressure change threshold value and the pressure difference value is less than or equal to zero; in the single-regulation mode, the steam delivery of the tube boiler is adjusted to maintain the steam outflow of the once-through boiler at its steam outflow steady value. The method controls the load adjusting sequence of various furnace types under different working conditions through steam pressure, matches the actual consumption of users, perfectly combines the performance advantages of the water tube boiler and the through-flow boiler under the regulation and control of the scheme, achieves the effect of safety and energy conservation, and solves the problems of poor pressure adjusting capability and energy waste in industrial steam supply.
Description
Technical Field
The invention relates to the technical field of heating ventilation energy-saving control, in particular to an energy-saving control method and equipment for combined steam supply of a water tube boiler and a through-flow boiler.
Background
When a typical industrial park or business uses a gas-fired steam boiler, the steam-using equipment has stringent requirements on steam quality, does not allow for intermittent steam delivery and must be maintained at a certain pressure. However, the steam demand flow is changed along with time, and the boiler load regulation of the steam boiler is very important for the production safety.
When a certain steam device is suddenly started or production period of an enterprise is regulated, steam pressure can be caused to fluctuate rapidly, the conventional water pipe boiler is slow in regulation speed, the steam pressure changes suddenly, the conventional water pipe boiler is restored to a set steam pressure condition, the required time is determined by the steam pressure difference and the current steam flow, the time is long, through tests, the steam pressure of a 20t/h steam boiler is increased by 0.5MPa for about 10 minutes under the condition that the flow is not changed, and during the period, steam-water mixtures generated due to pressure changes are rapidly generated, so that most of condensed water is discharged, and energy waste is caused.
Meanwhile, when the gas-using equipment is suddenly closed, the steam consumption is sharply reduced, and the conventional water pipe boiler is slow in regulation rate, so that pipelines and equipment are likely to burst when the steam pressure is suddenly increased, the production safety is seriously threatened, and if a safety valve and a discharge valve are frequently opened in the period, the steam is also caused to leak, so that the energy waste is caused.
The through-flow boiler has good adjustability due to the unique structure, but the capacity of the through-flow boiler is small, the steam outflow rate of common products is 1t/h-20t/h, the steam outflow rate is small, and the basic main air supply task cannot be undertaken.
In view of the above problems, it is an urgent need to provide a technique that can improve the pressure regulating capability of the steam supply equipment in the industrial park while ensuring the supply of air and can achieve the purpose of saving energy.
Disclosure of Invention
The invention provides a method and equipment for controlling combined steam supply of a water tube boiler and a cross-flow boiler, which are used for solving the problem that the pressure regulating capacity and energy are insufficient under the condition of meeting the air supply requirement of steam supply equipment in an industrial park in the prior art.
In order to achieve the aim, the technical scheme of the invention provides a control method for combined steam supply of a water tube boiler and a through-flow boiler, which comprises the following steps: and acquiring a pressure difference value in unit time, entering a double-regulation mode if the difference between a pressure change threshold value and the pressure difference value is greater than zero, and entering a single-regulation mode if the difference between the pressure change threshold value and the pressure difference value is less than or equal to zero. In a double regulation mode, regulating the steam outflow of the through-flow boiler until the difference between the pressure change threshold value and the pressure difference value is less than or equal to zero; in the single-regulation mode, the steam delivery of the tube boiler is adjusted to maintain the steam outflow of the once-through boiler at its steam outflow steady value.
As a preferable preference of the above technical solution, preferably, the acquiring a pressure difference value per unit time includes: setting the pressure change threshold value in the unit time as delta P 0 And subtracting the set value of the steam pressure from the average value of the pressure detection in unit time to obtain the pressure difference value.
Preferably, in the above-described technical solution, in the double adjustment mode, adjusting the steam outflow rate of the once-through boiler until a difference between the pressure change limit value and the pressure difference value is equal to or less than zero includes:
judging whether the load rate of the first through flow boiler reaches 90%, if not, judging whether the load rate of the first through flow boiler reaches 90%; judging whether the difference between the pressure change threshold value and the pressure difference value is less than 0, if so, maintaining the current steam outlet flow rate of the second cross-flow boiler;
and continuously monitoring whether the difference between the pressure change threshold value and the pressure difference value is less than 0, if so, judging whether the load rate of the first once-through boiler reaches 90%, and if so, adjusting the steam outflow rate of the second once-through boiler so that the difference between the pressure change threshold value and the pressure difference value is less than or equal to zero.
Preferably, in the above technical solution, the water tube boiler is operated as a slave control in a first time period after the first or second once-through flow boiler is adjusted, the pressure gauge senses the steam pressure at the point to be measured, and the water tube boiler receives the pressure signal sent by the controller to adjust the steam outflow rate.
Preferably, as a preferred aspect of the above technical solution, a current average value of pressure detection in the system is obtained according to a current steam flow rate of the water tube boiler and a current steam flow rate of the through-furnace boiler, and a new pressure difference value in unit time is obtained by subtracting the current average value of pressure detection and a set value of steam pressure.
Preferably, as a preferable mode of the above-described aspect, the single adjustment mode is entered if the pressure difference value per unit time is equal to or less than 0.
Preferably, in the single adjustment mode, the steam supply rate of the tube boiler is increased or decreased so that the steam outflow rate of the once-through boiler is maintained at a constant value.
The invention also provides a combined steam supply device of a water tube boiler and a through-flow boiler, which comprises: the pressure gauge is connected with the controller, the water tube boiler and the through-flow boiler are connected with one end of the flow meter in parallel through a main gas supply pipeline, two different signal interfaces of the controller are respectively connected with the water tube boiler and the through-flow boiler, and an output signal end of the flow meter is connected with a receiving end of the controller.
The technical scheme of the invention provides a method and equipment for supplying steam by combining a water tube boiler and a through-flow boiler, wherein a pressure difference value in unit time is obtained, if the difference between a pressure change threshold value and the pressure difference value is greater than zero, a double-regulation mode is entered, otherwise, a single-regulation mode is entered; in a double regulation mode, regulating the steam outflow of the through-flow boiler until the difference between the pressure change threshold value and the pressure difference value is less than or equal to zero; in the single-regulation mode, the steam delivery of the tube boiler is adjusted to maintain the steam outflow of the once-through boiler at its steady value of steam outflow.
The invention judges the state of the steam using equipment by detecting the pressure change of the steam, and sends out an instruction to the regulation and control sequence of the boiler at the fastest speed, thereby ensuring the pressure stability of the supplied air. The problems of poor pressure regulation capability and energy waste in industrial steam supply are solved. The method controls the load adjusting sequence of various boiler types under different working conditions through steam pressure, matches the actual consumption of users, perfectly combines the performance advantages of the water tube boiler and the through-flow boiler under the regulation and control of the scheme, and achieves the effect of safety and energy conservation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description will be given below of the drawings required for the embodiments or the technical solutions in the prior art, and it is obvious that the drawings in the following description are 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 creative efforts.
FIG. 1 is a schematic structural view of an apparatus for combined steam supply of a tube boiler and a through-flow boiler according to the present invention.
FIG. 2 is a flow chart of a method for controlling combined steam supply of a tube boiler and a once-through boiler according to the present invention.
FIG. 3 is a flow chart of a method for controlling combined steam supply of a tube boiler and a once-through boiler according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
First, the apparatus for supplying steam by combining a tube boiler and a tubular boiler according to the present invention is described, as shown in fig. 1, including: a pressure gauge 3, a water tube boiler 4, a through-flow boiler group 5, a flow meter 1 and a controller 2,
the pressure gauge 3 is connected with the controller 2, and two different adjusting signal ports of the controller 2 are respectively connected with the water tube boiler 4 and the through-flow boiler group 5. The water tube boiler 4 and the through-flow boiler group 5 are connected to the flow meter 1 in parallel through a main steam supply pipeline, and signals of the flow meter 1 are transmitted to the controller 2. The once-through boiler group comprises a first once-through boiler for carrying out the main regulation and a second once-through boiler for carrying out the secondary regulation.
In particular, the method comprises the following steps of,
the flow meter 1 is a metering device with functions of instantaneous flow value and accumulated flow value and remote transmission, and can output analog quantity or digital quantity signals, and the signal output form is a metering function device unit with wired or wireless transmission.
The controller 2 is used for receiving the pressure signal transmitted by the flow meter 1 and transmitted by the pressure meter 3, and the two signal types can be analog quantity signals or digital quantity signals. The controller 2 has processing and calculating functions, and can input set values through keys, convert the set values/calculation results into analog quantity or digital quantity signals and input the analog quantity or digital quantity signals into downstream equipment.
The pressure gauge 3 is also arranged on the main steam supply pipeline and outputs analog quantity or digital quantity signals according to measured pressure values, and the signals are transmitted to the controller 2 in a wired or wireless mode.
The water tube boiler 4 is a steam generating device consisting of a boiler barrel, a header, a water wall, a convection tube beam and a combustion system, can receive signals to carry out load regulation, and has large installed capacity but poor regulation performance.
The through-flow boiler is a steam generating device which consists of a calandria heating section, an evaporation section, a superheating section, an upper header and a lower header and the like, can receive signals to carry out load regulation, and has good regulation performance but small installed capacity.
The method for controlling the combined steam supply of the tube boiler and the tubular boiler according to the present invention will now be described with reference to the above-mentioned piping structure, as shown in fig. 2 and 3: the total stable steam outflow of the first and second through-flow boilers is G 0 The total flow rate of the adjusting steam of the first through-flow boiler and the second through-flow boiler is named as G 1 。
Step 101, setting a pressure change threshold value, a steam pressure set value and a pressure detection average value.
Specifically, a unit time t is set A Limit value Δ P for internal pressure change 0 Steam pressure setpoint P 1 Unit time t A Mean value of pressure measurement P 2 。
And 102, acquiring a pressure difference value in unit time.
Setting the steam pressure to a value P 1 And the average value P of pressure detection 2 Making a difference to obtain a unit time t A Internal pressure difference Δ P 1 。
And 103, judging whether the difference delta P between the absolute value of the pressure difference value and the pressure change threshold value is larger than 0.
If Δ P is greater than 0, then go to the double adjustment mode described in steps 104-107, otherwise go to the single adjustment mode described in step 109.
And 104, judging whether the load rate of the first through flow boiler reaches a threshold value, if so, executing a step 105, otherwise, executing a step 106.
The first cross flow boiler maintains the same or reduces the steam outlet flow, and the corresponding second cross flow boiler increases the steam outlet flow.
And 106, regulating the steam outflow rate of the first cross flow boiler by the first cross flow boiler, wherein the steam outflow rate of the second cross flow boiler is constant.
Specifically, the first through flow boiler receives the signal of the controller and then acts to regulate the flow G 1 The first through flow boiler load rate is continuously monitored in the adjusting processIf not, 90%, and if yes, not satisfying | Δ P 1 |≤ΔP 0 Then, the process returns to step 105 to control the operation of the second once-through-flow boiler, and if the first once-through-flow boiler satisfies | Δ P until the load factor reaches 90% in this step 1 |≤ΔP 0 And then the second through-flow boiler keeps the working state of constant outlet flow in the single regulation mode.
Specifically, the first once-through boiler is adjusted individually in steps 105 and 106 or the first and second once-through boilers are adjusted simultaneously as a master adjustment for a first time t B The inner tube boiler acts as a slave regulator, where t B ＝t A ·|ΔP 1 |/ΔP 0. . The pressure gauge senses the steam pressure of the measured point, transmits a pressure signal to the controller, and the water pipe boiler regulates the flow G according to the received signal of the controller 2 Becoming larger or smaller.
And 108, judging whether the difference delta P between the absolute value of the adjusted pressure difference value and the pressure change threshold value is less than or equal to 0, if so, executing a step 109, otherwise, returning to the step 104.
When | Δ P 1 |≤ΔP 0 When delta P is less than or equal to 0, the system enters a single regulation mode to work, and the total steam outflow amount G of the first through-flow boiler and the second through-flow boiler is equal to or less than 0 1 Will be at the set time t C Internal regulation to G 0， Wherein t is C ＝t A ·|ΔP 1 |/ΔP 0. +60s。
The pressure gauge senses the steam pressure of a measured point, the pressure signal is transmitted to the controller, the controller controls the steam outflow rate of the water tube boiler through the pressure signal, the steam conveying capacity of the water tube boiler is increased when the pressure gauge is changed to be high, and otherwise, the steam conveying capacity of the water tube boiler is reduced when the pressure is changed to be low. In the single regulation mode, the first through-flow boiler and the second through-flow boiler are not regulated, and the total stable steam outlet flow is G 0 Is constant.
The invention provides an energy-saving control method, relates to the field of heating ventilation energy saving and safety control, and solves the problems of poor pressure regulation capability and energy waste in industrial steam supply. The method controls the load adjusting sequence of various boiler types under different working conditions through steam pressure, matches the actual consumption of users, and perfectly combines the performance advantages of the water tube boiler and the through-flow boiler under the control of the method, thereby achieving the effect of safety and energy conservation.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A method for controlling combined steam supply of a water tube boiler and a through-flow boiler is characterized by comprising the following steps:
acquiring a pressure difference value in unit time, entering a double-regulation mode if the difference between a pressure change threshold value and the pressure difference value is greater than zero, and entering a single-regulation mode if the difference between the pressure change threshold value and the pressure difference value is less than or equal to zero;
in the double regulation mode, regulating the steam outflow of the through-flow boiler until the difference between the pressure change threshold value and the pressure difference value is less than or equal to zero;
in the single-regulation mode, the steam delivery of the tube boiler is adjusted to maintain the steam outflow of the once-through boiler at its steam outflow steady value.
2. The method of claim 1, wherein said obtaining a pressure differential value per unit time comprises:
setting the pressure change threshold value in the unit time as delta P 0 Setting the steam pressure atAnd subtracting the fixed value from the average pressure detection value in the unit time to obtain the pressure difference value.
3. The method of claim 1, wherein in the double regulation mode, adjusting a steam outflow of a once-through boiler to a difference between the pressure change threshold and the pressure difference value of less than or equal to zero comprises:
judging whether the load rate of the first through flow boiler reaches 90%, if not, judging whether the load rate of the first through flow boiler reaches 90%; judging whether the difference between the pressure change threshold value and the pressure difference value is less than 0, if so, maintaining the current steam outflow rate of the second tubular boiler;
and continuously monitoring whether the difference between the pressure change threshold value and the pressure difference value is less than 0, if so, judging whether the load rate of the first through-flow boiler reaches 90%, and if so, simultaneously adjusting the steam outflow rates of the second through-flow boiler and the first through-flow boiler so that the difference between the pressure change threshold value and the pressure difference value is less than or equal to zero.
4. The method according to claim 3, characterized in that the water tube boiler acts as a slave regulator in the first time after the first once-through boiler is regulated alone or after the first once-through boiler and the second once-through boiler are regulated simultaneously, the pressure gauge senses the steam pressure of the point to be measured, and the water tube boiler receives the pressure signal sent by the controller to regulate the steam outflow quantity.
5. The method according to claim 4, wherein a current pressure detection average value in the system is obtained according to the current steam flow rate of the water tube boiler and the steam flow rate of the through furnace boiler, and the current pressure detection average value is differed from the steam pressure set value to obtain a new pressure difference value in unit time.
6. The method of claim 5, wherein the single adjustment mode is entered if the new pressure difference per unit time is less than or equal to 0.
7. Method according to claim 6, characterized in that in the single-regulation mode the steam delivery of the water tube boiler is increased or decreased so that the steam outflow of the once-through boiler is maintained at a steady value.
8. A combined tube boiler and through-flow boiler steam plant system, comprising: a pressure gauge, a water tube boiler, a through-flow boiler, a flow meter and a controller,
the pressure meter is connected with the controller, the water tube boiler and the through-flow boiler are connected with one end of the flowmeter in parallel through a main air supply pipeline, two different signal interfaces of the controller are respectively connected with the water tube boiler and the through-flow boiler, and an output signal end of the flowmeter is connected with a receiving end of the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211252833.8A CN115751277A (en) | 2022-10-13 | 2022-10-13 | Control method and device for combined steam supply of water tube boiler and through-flow boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211252833.8A CN115751277A (en) | 2022-10-13 | 2022-10-13 | Control method and device for combined steam supply of water tube boiler and through-flow boiler |
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| CN115751277A true CN115751277A (en) | 2023-03-07 |
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| CN202211252833.8A Pending CN115751277A (en) | 2022-10-13 | 2022-10-13 | Control method and device for combined steam supply of water tube boiler and through-flow boiler |
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