CN110953572A - Agricultural and forestry biomass water-cooling vibration grate boiler desuperheating water combined regulation and control strategy and method - Google Patents
Agricultural and forestry biomass water-cooling vibration grate boiler desuperheating water combined regulation and control strategy and method Download PDFInfo
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- CN110953572A CN110953572A CN201811122471.4A CN201811122471A CN110953572A CN 110953572 A CN110953572 A CN 110953572A CN 201811122471 A CN201811122471 A CN 201811122471A CN 110953572 A CN110953572 A CN 110953572A
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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
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- F22G—SUPERHEATING OF STEAM
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Abstract
The invention relates to a three-stage desuperheating water combined regulation strategy and a three-stage desuperheating water combined regulation method for an agriculture and forestry biomass water-cooled vibrating grate boiler. The primary superheater, the primary desuperheater, the secondary superheater, the secondary desuperheater, the tertiary superheater, the tertiary desuperheater and the quaternary superheater are sequentially communicated; the high-pressure water supply main pipe is connected with a first branch pipe, a second branch pipe and a third branch pipe in parallel, and the three branch pipes are respectively connected to a primary desuperheater, a secondary desuperheater and a tertiary desuperheater; the branch pipes are respectively provided with a first temperature-reducing water regulating valve, a second temperature-reducing water regulating valve and a third temperature-reducing water regulating valve; the first, second and third temperature-reducing water regulating valves are controlled by the change of the enthalpy value of the steam. The technical problems that the steam temperature of the superheater of the existing agriculture and forestry biomass water-cooling vibration grate boiler is large in fluctuation and easy to exceed the limit can be solved.
Description
Technical Field
The invention relates to the technical field of automatic control of boiler desuperheating water, in particular to a three-stage desuperheating water combined regulation strategy and method for an agriculture and forestry biomass water-cooled vibrating grate boiler.
Background
Agriculture and forestry living beings water-cooling vibration grate boiler is generally provided with level four over heater and tertiary desuperheater. The saturated steam of boiler is via one-level over heater, one-level desuperheater, the second grade over heater, the second grade desuperheater, tertiary over heater, tertiary desuperheater, the level four over heater heats into superheated steam, pass through one-level desuperheater control second grade over heater exit temperature by one-level desuperheater governing valve in the heating process, the tertiary over heater exit temperature of second grade desuperheater governing valve passing through the second grade desuperheater, tertiary desuperheater governing valve is through the tertiary desuperheater of level four over heater exit temperature (be main steam temperature promptly), make the over heater temperature at each level in reasonable range, main steam temperature is undulant near the design value, satisfy the requirement of steam turbine to main steam temperature quality.
In the temperature reduction water control, the actual effect of applying the traditional cascade PID control mode is poor, the requirement of automatic control of the outlet temperature of each superheater can not be met, particularly, the three-level superheater is often in an overtemperature state, and great potential safety hazard is brought to long-term stable economic operation of equipment.
Based on this, the prior art still remains to be improved.
Disclosure of Invention
The invention aims to solve the problems and provides a three-stage desuperheating water combined regulation and control method for an agriculture and forestry biomass vibrating grate boiler, which can solve the technical problems of instability of combustion and large temperature fluctuation of a superheater in the agriculture and forestry biomass vibrating grate boiler in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the embodiment of the invention discloses a method for jointly regulating and controlling three-stage desuperheating water of an agriculture and forestry biomass vibrating grate boiler, which adopts a steam enthalpy value to represent the influence of the change of combustion working conditions in the boiler on the steam temperature of the outlet of each stage of superheater, thereby controlling the opening of each stage of desuperheating water regulating valve and realizing the control on the temperature of the outlet of each stage of superheater.
Further, a primary superheater, a primary desuperheater, a secondary superheater, a secondary desuperheater, a tertiary superheater, a tertiary desuperheater and a quaternary superheater are sequentially connected;
the high-pressure water supply main pipe is connected into the first-stage desuperheater, the second-stage desuperheater and the third-stage desuperheater in parallel through the first branch pipe, the second branch pipe and the third branch pipe;
a first temperature-reducing water regulating valve is arranged on the first branch pipe, a second temperature-reducing water regulating valve is arranged on the second branch pipe, and a third temperature-reducing water regulating valve is arranged on the third branch pipe;
the first, second and third temperature-reducing water regulating valves are controlled by the change of the enthalpy value of the steam.
Further, the first temperature-reducing water regulating valve adopts single-stage PID adjustment, the adjustment is carried out through the change of the steam enthalpy value of the second-stage superheater, and the change of the outlet steam enthalpy value of the third-stage superheater is adopted as the adjustment feedforward of the first temperature-reducing water regulating valve.
Further, the second temperature-reducing water regulating valve adopts cascade PID regulation;
and fitting the steam pressure, the temperature and the flow of the inlet and the outlet of the tertiary superheater to reflect the combustion condition in the furnace, and prejudging the temperature change of the steam at the outlet of the tertiary superheater to adjust the second temperature-reducing water regulating valve.
Further, the change of the enthalpy value of the steam at the outlet of the four-stage superheater is used as the adjustment feedforward of the second desuperheating water regulating valve.
Further, the change function of the enthalpy value of the outlet steam of the tertiary superheater is as follows:
△H3(x)＝K*H(K31f3(t)+K32f3(p))+K33f3(l)+D，
wherein: h-the enthalpy value of steam at the outlet of the tertiary superheater;
t-the temperature of steam at the outlet of the tertiary superheater;
p-main vapor pressure;
l-main steam flow;
(x) -the effect of variables on superheater outlet temperature;
k-coefficient to be adjusted;
d is the constant to be adjusted.
Further, the third temperature-reducing water regulating valve adopts cascade PID regulation and is regulated through the change of the steam enthalpy value of an inlet and an outlet of the four-stage superheater.
Further, the steam pressure difference between the high-pressure water supply main pipe and the primary desuperheater, the secondary desuperheater and the tertiary desuperheater is 0.5-0.8 MPa.
On the other hand, the embodiment of the invention also discloses an agriculture and forestry biomass water-cooling vibration grate boiler adopting a three-stage desuperheating water combined regulation and control method of the agriculture and forestry biomass vibration grate boiler, which comprises a high-pressure water supply main pipe, and a first-stage superheater, a first-stage desuperheater, a second-stage superheater, a second-stage desuperheater, a third-stage superheater, a third-stage desuperheater and a fourth-stage superheater which are sequentially communicated;
the high-pressure water supply main pipe is connected with a first branch pipe, a second branch pipe and a third branch pipe in parallel, the first branch pipe is connected to the first-stage desuperheater, the second branch pipe is connected to the second-stage desuperheater, and the third branch pipe and the third-stage desuperheater are connected in parallel;
a first temperature-reducing water regulating valve is arranged on the first branch pipe, a second temperature-reducing water regulating valve is arranged on the second branch pipe, and a third temperature-reducing water regulating valve is arranged on the third branch pipe;
the first, second and third temperature-reducing water regulating valves are controlled by the change of the enthalpy value of the steam.
Further, the first temperature-reducing water regulating valve adopts single-stage PID adjustment, the adjustment is carried out through the change of the enthalpy value (calculated according to the steam characteristic function) of the outlet steam of the secondary superheater, and the temperature of the outlet steam of the tertiary superheater is adopted as the feedforward of the first temperature-reducing water regulating valve;
the second temperature-reducing water regulating valve adopts cascade PID regulation, reflects the combustion working condition in the furnace through fitting of steam pressure, temperature and flow of an inlet and an outlet of the tertiary superheater, and carries out prejudgment on the temperature change of the tertiary superheater for regulation;
the temperature of steam at the outlet of the four-stage superheater is used as the feedforward of the second temperature-reducing water regulating valve;
and the third temperature-reducing water regulating valve adopts cascade PID regulation and is regulated through the change of the enthalpy value of the steam at the outlet of the four-stage superheater.
The invention has the beneficial effects that:
the outlet temperature of each stage of superheater is controlled in a corresponding temperature range through a desuperheating water combined control strategy based on the steam enthalpy value, so that each stage of superheater is protected, the temperature of main steam is controlled in an ideal range, the technical problems that the outlet temperature of the superheater of the agriculture and forestry biomass water-cooling vibration grate boiler in the prior art is large in fluctuation and easy to overrun are solved, and the requirement of a steam turbine on the quality of the main steam is met.
Drawings
FIG. 1 is a schematic diagram of joint regulation according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of combined regulation according to yet another embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention discloses a method for jointly regulating and controlling three-stage desuperheating water of an agriculture and forestry biomass vibrating grate boiler, which adopts a steam enthalpy value to represent the influence of the combustion working condition in the boiler on the steam temperature of the outlet of each stage of superheater, thereby controlling the opening of each stage of desuperheating water regulating valve and realizing the control on the outlet temperature of each stage of superheater.
As shown in fig. 1, the embodiment of the invention discloses a method for jointly regulating and controlling three-level desuperheating water of an agriculture and forestry biomass vibrating grate boiler, wherein a first-level superheater, a first-level desuperheater, a second-level superheater, a second-level desuperheater, a third-level superheater, a third-level desuperheater and a fourth-level superheater are sequentially connected in the biomass boiler;
the high-pressure water supply main pipe is connected into the first-stage desuperheater, the second-stage desuperheater and the third-stage desuperheater in parallel through the first branch pipe, the second branch pipe and the third branch pipe;
a first temperature-reducing water regulating valve is arranged on the first branch pipe, a second temperature-reducing water regulating valve is arranged on the second branch pipe, and a third temperature-reducing water regulating valve is arranged on the third branch pipe;
the first, second and third temperature-reducing water regulating valves are controlled by the change of the enthalpy value of the steam.
In the embodiment, the steam enthalpy value is used for representing the influence of combustion change of the hearth on each stage of superheater, and the change trend of the controlled quantity can be well reflected in the control of each stage of desuperheating water regulating valve, so that the opening degree of the desuperheating water regulating valve is quickly adjusted, and the purpose of automatically controlling the outlet temperature of each stage of superheater is achieved.
Specifically, the first attemperation water regulating valve can adopt single-stage PID adjustment, the adjustment is carried out through the change of the steam enthalpy value of the secondary superheater, and the change of the outlet steam enthalpy value of the tertiary superheater is adopted as the adjustment feedforward of the first attemperation water regulating valve.
The secondary superheater is arranged in a convection flue of the boiler, the temperature change of the hearth has little influence on the outlet temperature of the secondary superheater, and the temperature change of the secondary superheater responds to the first desuperheater water regulating valve in time under the condition of enough desuperheater water pressure, so that the first desuperheater water regulating valve can adopt single PID control to ensure that the outlet temperature of the secondary superheater does not exceed the standard.
Due to the instability of biomass energy boiler combustion, the temperature of the hearth changes violently, the temperature of the hearth rises after the grate vibrates, each stage of superheater is heated seriously, and the outlet temperature of each stage of superheater rises; the temperature of the rear hearth is gradually reduced, the heating of each superheater is reduced, and the outlet temperature of each stage of superheater is reduced. Therefore, the outlet temperature of the next stage superheater is used as the feedforward of the previous stage desuperheating water regulating valve, the outlet temperature change of the next stage superheater is fed back to the control PID of the previous stage desuperheating water regulating valve, and the superheater is taken as a whole to control the outlet temperature of the superheater so as to achieve the purpose of controlling the temperature of the main steam.
In some embodiments of the invention, the second attemperation water regulating valve adopts cascade PID regulation; and fitting the steam pressure, the temperature and the flow of the inlet and the outlet of the tertiary superheater to reflect the combustion condition in the furnace, and prejudging the temperature change of the steam at the outlet of the tertiary superheater to adjust the second temperature-reducing water regulating valve.
Preferably, the change of the enthalpy value of the steam at the outlet of the four-stage superheater is used as the adjustment feed-forward of the second temperature-reducing water regulating valve. In the embodiment, a method for fitting the enthalpy value of the steam is adopted to reflect the change trend of the temperature at the outlet of the superheater, and the trend can reflect the change of the temperature at the outlet of the superheater in time and quickly to serve as the adjusting basis of the temperature-reducing water regulating valve.
The tertiary superheater is arranged in the hearth to receive flame radiant heat and is most severely influenced by the temperature change of the hearth. The response of the opening change of the three-stage temperature-reducing water regulating valve is fast, so the three-stage temperature-reducing water regulating valve adopts cascade PID control, and the aim of stably controlling the temperature of outlet steam can be achieved by setting PID parameters, introducing feedforward and the like.
It can be determined by analysis that the amount of change in tertiary superheater outlet temperature can be approximated as a function of temperature, pressure, and flow:
△H3(x)＝K*H(K31f3(t)+K32f3(p))+K33f3(l)+D，
wherein: h-the enthalpy value of steam at the outlet of the tertiary superheater;
t-the temperature of steam at the outlet of the tertiary superheater;
p-main vapor pressure;
l-main steam flow;
(x) -the effect of variables on superheater outlet temperature;
k-coefficient to be adjusted;
d is the constant to be adjusted.
Through fitting several parameters which have larger influence on the tertiary superheater, the secondary desuperheating water regulating valve can respond to various working conditions in time, and the purpose of controlling the outlet temperature of the tertiary superheater is achieved.
In some embodiments of the invention, the third temperature-reducing water regulating valve adopts cascade PID regulation, and the regulation is realized through the change of the enthalpy value of the steam at the inlet and the outlet of the four-stage superheater.
In some embodiments of the invention, the steam pressure difference between the high-pressure water supply main pipe and the primary desuperheater, the secondary desuperheater and the tertiary desuperheater is 0.5-0.8 MPa. The temperature of the outlet of the superheater is not reduced under the working condition of large opening degree for a long time by the temperature-reducing water regulating valves at all levels, and the problem of insufficient temperature-reducing water is firstly considered, and the electric temperature regulating valve for supplying main water to the steam drum needs to be automatically controlled so as to meet the requirement that the pressure difference between the pressure of a main water supply pipeline and the pressure of steam of the desuperheater is 0.5-0.8MPa, ensure that the temperature-reducing water smoothly enters the desuperheater and ensure the temperature-reducing effect of the desuperheater.
The embodiment of the invention also discloses a biomass boiler which comprises a high-pressure water supply main pipe, and a primary superheater, a primary desuperheater, a secondary superheater, a secondary desuperheater, a tertiary superheater, a tertiary desuperheater and a quaternary superheater which are sequentially communicated;
the high-pressure water supply main pipe is connected with a first branch pipe, a second branch pipe and a third branch pipe in parallel, the first branch pipe is connected to the first-stage desuperheater, the second branch pipe is connected to the second-stage desuperheater, and the third branch pipe and the third-stage desuperheater are connected in parallel;
a first temperature-reducing water regulating valve is arranged on the first branch pipe, a second temperature-reducing water regulating valve is arranged on the second branch pipe, and a third temperature-reducing water regulating valve is arranged on the third branch pipe;
the first, second and third temperature-reducing water regulating valves are controlled by the change of the enthalpy value of the steam.
Preferably, the first temperature-reducing water regulating valve adopts single-stage PID adjustment, the adjustment is carried out through the change of the enthalpy value of the outlet steam of the secondary superheater, and the temperature of the outlet steam of the tertiary superheater is adopted as the feed-forward of the first temperature-reducing water regulating valve;
the second temperature-reducing water regulating valve adopts cascade PID regulation, reflects the combustion working condition in the furnace through fitting of steam pressure, temperature and flow of an inlet and an outlet of the tertiary superheater, and carries out prejudgment on the temperature change of the tertiary superheater for regulation;
the outlet temperature of the fourth-stage superheater is used as the feedforward of the second temperature-reducing water regulating valve;
and the third temperature-reducing water regulating valve adopts cascade PID regulation and is regulated through the change of the enthalpy value of the steam at the outlet of the four-stage superheater.
Examples
A three-stage desuperheating water combined regulation and control strategy and a method for an agriculture and forestry biomass water-cooled vibrating grate boiler are disclosed, wherein a third desuperheating water regulating valve adopts the traditional cascade PID regulation, and PID parameters are re-regulated according to the PID parameter setting principle and experience. The steam pressure, the temperature and the flow are fitted to reflect the combustion condition of the boiler, the temperature change of the superheater is pre-judged, and then the second temperature-reducing water regulating valve is regulated, as shown in fig. 2. The first temperature-reducing water regulating valve adopts single-stage PID regulation, and the outlet temperature of the three-stage superheater is adopted as the feedforward of the first temperature-reducing water regulating valve, so that the temperature of the superheated steam is integrally regulated.
In conclusion, the invention considers the overheaters of one to four stages as a whole aiming at the conditions that the overheater outlet temperature of the agriculture and forestry biomass water-cooling vibration grate boiler has large fluctuation and is easy to exceed the limit, considers the increase and decrease of the amount of the attemperation water when the temperature of the hearth changes, takes the attemperation water regulating valves of one to three stages as a whole, controls the outlet temperature of the overheater of the next stage by each stage of attemperation water regulating valve, simultaneously participates in the adjustment of the integral temperature of the overheater, achieves the aim of timely and rapid adjustment, adopts the mode of main steam pressure, flow and overheater outlet temperature when fitting the steam enthalpy value, simultaneously refers to the factors of the temperature and load change of the hearth, carries out parameter setting on the attemperation water regulating valves by innovatively applying the enthalpy value calculation mode, can better adapt to most working conditions, the automatic operation condition of the attemperation water regulating valves, the service life of the superheater is protected, and the heat efficiency of the boiler is improved. The three-stage desuperheating water combined regulation and control strategy and method for the agriculture and forestry biomass water-cooled vibrating grate boiler greatly reduce the workload of operators and reduce the labor intensity. The control strategy has great guiding significance for automatic control of desuperheating water of the agricultural and forestry biomass water-cooled vibrating grate boiler superheater, and has strong popularization value.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention; it is intended that the following claims be interpreted as including all such alterations, modifications, and equivalents as fall within the true spirit and scope of the invention.
Claims (8)
1. A three-stage desuperheating water combined regulation strategy and a three-stage desuperheating water combined regulation method for an agriculture and forestry biomass water-cooling vibrating grate boiler are characterized in that steam enthalpy values are adopted to represent the influence of combustion condition changes in the boiler on the steam temperature of the outlet of each stage of superheater, so that the opening degree of each stage of desuperheating water regulating valve is controlled, and the temperature of the outlet of each stage of superheater is controlled.
2. The method according to claim 1, wherein the primary superheater, the primary desuperheater, the secondary superheater, the secondary desuperheater, the tertiary superheater, the tertiary desuperheater and the quaternary superheater are sequentially connected;
the high-pressure water supply main pipe is connected into the first-stage desuperheater, the second-stage desuperheater and the third-stage desuperheater in parallel through the first branch pipe, the second branch pipe and the third branch pipe;
a first temperature-reducing water regulating valve is arranged on the first branch pipe, a second temperature-reducing water regulating valve is arranged on the second branch pipe, and a third temperature-reducing water regulating valve is arranged on the third branch pipe;
the first, second and third temperature-reducing water regulating valves are controlled by the change of the enthalpy value of the steam.
3. The method of claim 2, wherein the first attemperation water conditioning valve employs a single stage PID adjustment, adjusted by changes in steam enthalpy of the secondary superheater, and changes in outlet steam enthalpy of the tertiary superheater are employed as a feed forward adjustment of the first attemperation water conditioning valve.
4. The method of claim 2, wherein the second chilled water register valve is regulated using a cascade PID;
and fitting the steam pressure, the temperature and the flow of the inlet and the outlet of the tertiary superheater to reflect the combustion condition in the furnace, and prejudging the temperature change of the steam at the outlet of the tertiary superheater to adjust the second temperature-reducing water regulating valve.
5. The method of claim 4, wherein the fourth stage superheater outlet steam enthalpy change is used as a regulation feed forward for the third attemperation water conditioning valve.
6. The method of claim 4 or 5, wherein the outlet steam enthalpy change function of the tertiary superheater is:
△H3(x)＝K*H(K31f3(t)+K32f3(p))+K33f3(l)+D，
wherein: h-the enthalpy value of steam at the outlet of the tertiary superheater;
t-the temperature of steam at the outlet of the tertiary superheater;
p-main vapor pressure;
l-main steam flow;
(x) -the effect of variables on superheater outlet temperature;
k-coefficient to be adjusted;
d is the constant to be adjusted.
7. The method of claim 2, wherein the third desuperheating water conditioning valve is regulated by a change in inlet and outlet steam enthalpy of the four-stage superheater using a cascade PID regulation.
8. The method of claim 2, wherein the steam pressure differential between the high pressure feedwater header and the primary, secondary, and tertiary attemperators is between 0.5 and 0.8 MPa.
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| CN113587116A (en) * | 2021-09-28 | 2021-11-02 | 光大环保技术装备（常州）有限公司 | Control method, control system and equipment for protection equipment in water-cooling circulation system |
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