CN111120874A - Pressure control device for boiler gas pipeline - Google Patents
Pressure control device for boiler gas pipeline Download PDFInfo
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- CN111120874A CN111120874A CN202010061407.0A CN202010061407A CN111120874A CN 111120874 A CN111120874 A CN 111120874A CN 202010061407 A CN202010061407 A CN 202010061407A CN 111120874 A CN111120874 A CN 111120874A
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- valve
- pressure
- gas pipeline
- pressure control
- control device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
Abstract
The invention relates to a pressure control device for a boiler gas pipeline, comprising: electromagnetism three-way valve, piezoelectric sensor and PI controller, the input of electromagnetism three-way valve links to each other with upper reaches gas pipeline, the first output of electromagnetism three-way valve links to each other with low reaches gas pipeline through the valve, just the both ends of valve are equipped with respectively piezoelectric sensor for detect the pressure signal at valve both ends, the PI controller with piezoelectric sensor links to each other, carries out the proportional-integral operation according to the pressure differential at valve both ends, the real-time aperture of control flap. The invention can effectively improve the response speed and the regulation stability of the boiler gas pipeline pressure control.
Description
Technical Field
The invention relates to the field of mechanical equipment, in particular to a pressure control device for a boiler gas pipeline.
Background
At present, the pressure regulating valve is widely applied to pressure control of a gas pipeline as an important device for pressure control. The pressure control of the existing boiler gas pipeline mainly depends on an emergency cut-off valve, a pressure regulating valve, a one-way valve and the flow direction and the flow of control gas, wherein the pressure control of the gas pipeline is mainly performed by the pressure regulating valve. When current air-vent valve is used for boiler gas pipeline pressure control, because there is mechanical inertia in the air-vent valve part, there is the slow problem of response speed, when boiler burner closed, the air-vent valve just can reach closed position completely to delay several seconds, and at this in-process, the gas can continuously get into air-vent valve low reaches pipeline, makes low reaches pipeline pressure rise in the twinkling of an eye, brings certain potential safety hazard. And when the load of the boiler is increased or decreased, the gas pressure fluctuation is large, and the pressure is difficult to stabilize through a pressure regulating valve formed by pure machinery.
Disclosure of Invention
The invention provides a pressure control device applied to a boiler gas pipeline aiming at the defects of the prior art, and when a boiler burner is closed or the upstream/downstream pressure of the gas pipeline fluctuates, the response speed and the regulation stability of the boiler gas pipeline pressure control are effectively improved through a buffer tank, an electromagnetic three-way valve, a PI controller and other components in the control device.
In order to solve at least one of the above technical problems, the technical solution adopted by the present invention is:
a pressure control device for a boiler gas duct, comprising: electromagnetism three-way valve, piezoelectric sensor and PI controller, the input of electromagnetism three-way valve links to each other with upper reaches gas pipeline, the first output of electromagnetism three-way valve links to each other with low reaches gas pipeline through the valve, just the both ends of valve are equipped with respectively piezoelectric sensor for detect the pressure signal at valve both ends, the PI controller with piezoelectric sensor links to each other, carries out the proportional-integral operation according to the pressure differential at valve both ends, the real-time aperture of control flap.
Further, the method also comprises the following steps: buffer tank and check valve, the buffer tank respectively with solenoid valve's input and upper reaches gas pipeline link to each other, the both ends of check valve respectively with buffer tank and solenoid valve's second output link to each other, form air feed buffer circuit.
Further, the electromagnetism three-way valve interlocks with boiler combustor solenoid valve, works as when boiler combustor solenoid valve is closed, the electromagnetism three-way valve moves simultaneously, closes first output is opened the second output communicates the air feed buffer circuit.
Further, the volume V of the buffer tank is calculated by the formula: v is more than or equal to Q/(7500 multiplied by k multiplied by p), wherein Q is the design flow of the gas pipeline, p is the outlet pressure of the valve, and k is the pressure coefficient: when p is more than or equal to 0.01MPa, k is 0.6-0.8; when p is less than 0.01MPa, k is 1.2-1.4.
Further, the signal acquisition frequency of the piezoelectric sensor is 2-4 times per second.
Further, the PI controller comprises a PI operation module which executes the proportional integral operation, wherein the proportional operation is a nonlinear proportion.
Further, the proportional operation is yP＝-(x-Pm)2/Pm2+1，yPFor proportional operation to control output and integral operation as
yIFor controlling output by integral operation, the valve has real-time opening yt＝yP+yIWherein, the x axis is the actual pressure difference (x is more than or equal to 0 and less than or equal to Pm) at the front end and the rear end of the valve, the y axis is the valve opening (y is more than or equal to 0 and less than or equal to 1), Pm is the maximum pressure difference between the front end and the rear end allowed by the normal work of the valve, k isIIs a coefficient and kIAnd taking 8.5-13.5, wherein m in the integral operation is an integer.
The beneficial effects of the invention at least comprise: the pressure control device applied to the boiler gas pipeline is particularly suitable for the boiler gas pipeline for medium and low pressure gas supply and frequent fluctuation or frequent start and stop of gas supply pressure, not only provides more stable and accurate pressure control compared with the existing mechanical pressure regulating valve, but also can avoid potential safety hazards caused by sudden pressure increase caused by gas entering a downstream pipeline of the pressure regulating device when the boiler stops burning.
Drawings
FIG. 1 is a block diagram of a control device according to the present invention.
Fig. 2 is a control characteristic curve of the proportional operation valve opening degree according to the present invention.
The device comprises an upstream gas pipeline 1, a buffer tank 2, an electromagnetic three-way valve 3, a one-way valve 4, a valve 5, a piezoelectric sensor 6, a PI controller 7, a boiler burner electromagnetic valve 8, a downstream gas pipeline 9 and a gas supply buffer loop 10.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to specific examples. The following examples are illustrative only and are not to be construed as limiting the invention. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.
Example 1: fig. 1 is a structural block diagram of a control device of the present invention, and referring to fig. 1, the pressure control device applied to a boiler gas pipeline provided by the present invention mainly comprises a buffer tank, an electromagnetic three-way valve, a one-way valve, a PI controller, two piezoelectric sensors, a boiler burner electromagnetic valve, and the like. Specifically, the core improvement point is that the boiler burner electromagnetic valve interlocking device comprises a buffer tank and an electromagnetic three-way valve interlocked with the electromagnetic valve of the boiler burner, wherein an electromagnetic three-way bypass is connected with the buffer tank through a one-way valve. The back of the electromagnetic three-way valve is provided with a valve, the opening of the valve is controlled by a PI controller, the two piezoelectric sensors convert the pressure of the gas pipeline in front of and behind the valve into electric signals to be input into the PI controller, and the PI controller calculates the corresponding valve opening and outputs the corresponding valve opening to the valve, so that the pressure of the gas pipeline is controlled.
In the embodiment, the influence on the control when the upstream supply air pressure fluctuates is reduced by increasing the volume of the fuel gas pipeline through the buffer tank. The electromagnetic three-way valve is interlocked with the electromagnetic valve of the boiler burner, when the electromagnetic valve of the boiler burner is closed and the boiler stops burning, the electromagnetic three-way valve acts simultaneously to close the main path and open the bypass, namely, the gas supply buffer loop, so that gas enters the buffer tank through the one-way valve, and the gas is prevented from continuously flowing into a gas pipeline at the downstream of the valve through the valve. The valve is installed behind the electromagnetic three-way valve, the opening degree of the valve is controlled by the PI controller, the two piezoelectric sensors convert the pressure of the gas pipeline in front of and behind the valve into an electric signal to be input into the PI controller, the PI controller performs proportional (P) operation and integral (I) operation on the opening degree of the valve according to the pressure difference between the front end and the rear end of the valve, and the operation result is converted into the opening degree of the valve, so that the pressure control is performed on the gas pipeline, and the problems that the existing pressure regulating valve has mechanical inertia, the action is not timely, the difficulty in controlling the pressure of the gas pipeline is.
For more effective and accurate control gas pipeline's pressure, this application designs as follows: guarantee that the buffer tank installs the upstream gas pipeline at whole controlling means, the computational formula of buffer tank volume V is: v is more than or equal to Q/(7500 multiplied by k multiplied by p), wherein Q is the design flow of the gas pipeline, p is the outlet pressure of the valve, and k is the pressure coefficient: when p is more than or equal to 0.01MPa, k is 0.6-0.8; when p is less than 0.01MPa, k is 1.2-1.4. The signal acquisition frequency of the piezoelectric sensor is 2-4 times per second.
The PI controller comprises a PI operation module which executes the proportional integral operation, wherein the proportional operation is a nonlinear proportion, and a valve control characteristic curve of the PI controller is shown in figure 2.
More specifically: the mathematical expression of the control characteristic curve of the proportional operation valve is yP＝-(x-Pm)2/Pm2+1，yPIs the output of the proportional (P) operation control; the mathematical expression of the integral operation is
yIIs an integral (I) operationAnd controlling output. Real-time opening y of valvet＝yP+yIThe PI controller controls the opening of the valve to further control the pressure of the gas pipeline, wherein the x axis is the actual pressure difference between the front end and the rear end of the valve (x is more than or equal to 0 and less than or equal to Pm), the y axis is the opening of the valve (y is more than or equal to 0 and less than or equal to 1), Pm is the maximum pressure difference between the front end and the rear end allowed by the normal work of the valve, k isIIs a coefficient and kIAnd taking 8.5-13.5, wherein m in the integral operation formula is an integer.
In summary, the pressure control device applied to the boiler gas pipeline provided by the invention is particularly suitable for the boiler gas pipeline for medium and low pressure gas supply and frequent fluctuation or frequent start and stop of the gas supply pressure, not only provides more stable and accurate pressure control than the existing mechanical pressure regulating valve, but also can avoid potential safety hazard caused by sudden pressure increase when the gas enters the downstream pipeline of the pressure regulating device when the boiler stops burning.
Although embodiments of the present invention have been shown and described, it is understood that the embodiments are illustrative and not restrictive, that various changes, modifications, substitutions and alterations may be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A pressure control device for a boiler gas duct, characterized in that it comprises: electromagnetism three-way valve, piezoelectric sensor and PI controller, the input of electromagnetism three-way valve links to each other with upper reaches gas pipeline, the first output of electromagnetism three-way valve links to each other with low reaches gas pipeline through the valve, just the both ends of valve are equipped with respectively piezoelectric sensor for detect the pressure signal at valve both ends, the PI controller with piezoelectric sensor links to each other, carries out the proportional-integral operation according to the pressure differential at valve both ends, the real-time aperture of control flap.
2. The pressure control device of claim 1, further comprising: buffer tank and check valve, the buffer tank respectively with solenoid valve's input and upper reaches gas pipeline link to each other, the both ends of check valve respectively with buffer tank and solenoid valve's second output link to each other, form air feed buffer circuit.
3. The pressure control device of claim 2, wherein the three-way solenoid valve is interlocked with a boiler burner solenoid valve, and when the boiler burner solenoid valve is closed, the three-way solenoid valve simultaneously operates to close the first output port and open the second output port to communicate with the gas supply buffer circuit.
4. The pressure control apparatus according to claim 2, wherein the volume V of the buffer tank is calculated by the formula: v is more than or equal to Q/(7500 multiplied by k multiplied by p), wherein Q is the design flow of the gas pipeline, p is the outlet pressure of the valve, and k is the pressure coefficient: when p is more than or equal to 0.01MPa, k is 0.6-0.8; when p is less than 0.01MPa, k is 1.2-1.4.
5. The pressure control device of claim 1, wherein the piezoelectric sensor has a signal acquisition frequency of 2-4 times per second.
6. The pressure control device of claim 1, wherein the PI controller comprises a PI operation module that performs the proportional integral operation, wherein the proportional operation is non-linear proportional.
7. The pressure control device of claim 6, wherein the proportional operation is yP＝-(x-Pm)2/Pm2+1，yPFor proportional operation to control output and integral operation as
yIFor controlling output by integral operation, the valve has real-time opening yt＝yP+yIWherein the x-axis isThe actual pressure difference (x is more than or equal to 0 and less than or equal to Pm) at the front end and the rear end of the valve, the y axis is the valve opening (y is more than or equal to 0 and less than or equal to 1), Pm is the maximum pressure difference (k) allowed by the normal operation of the valve and between the front end and the rear end, andIis a coefficient and kIAnd taking 8.5-13.5, wherein m in the integral operation is an integer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010061407.0A CN111120874A (en) | 2020-01-19 | 2020-01-19 | Pressure control device for boiler gas pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010061407.0A CN111120874A (en) | 2020-01-19 | 2020-01-19 | Pressure control device for boiler gas pipeline |
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| Publication Number | Publication Date |
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| CN111120874A true CN111120874A (en) | 2020-05-08 |
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| CN202010061407.0A Pending CN111120874A (en) | 2020-01-19 | 2020-01-19 | Pressure control device for boiler gas pipeline |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060846A (en) * | 2021-11-02 | 2022-02-18 | 中国船舶重工集团公司第七0三研究所 | Pressure control method for boiler fuel oil main pipe |
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2020
- 2020-01-19 CN CN202010061407.0A patent/CN111120874A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060846A (en) * | 2021-11-02 | 2022-02-18 | 中国船舶重工集团公司第七0三研究所 | Pressure control method for boiler fuel oil main pipe |
| CN114060846B (en) * | 2021-11-02 | 2024-05-17 | 中国船舶重工集团公司第七0三研究所 | Boiler fuel oil main pipe pressure control method |
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