CN110397950B

CN110397950B - Boiler optimization combustion system

Info

Publication number: CN110397950B
Application number: CN201910697232.XA
Authority: CN
Inventors: 杜宏卿; 宋维庭; 丁继峰; 高绍会; 王玉山; 李西勇; 张荣彬
Original assignee: Shandong Laigang Yongfeng Steel and Iron Co Ltd
Current assignee: Shandong Laigang Yongfeng Steel and Iron Co Ltd
Priority date: 2019-07-30
Filing date: 2019-07-30
Publication date: 2022-06-14
Anticipated expiration: 2039-07-30
Also published as: CN110397950A

Abstract

The invention discloses an optimized combustion system of a boiler, which comprises a boiler DCS control system; the DCS is connected with an optimizing and adjusting system through OPC communication; the optimizing regulation system comprises a gas pressure regulation quick reflection system, an induced air optimal ratio optimizing system, an air-fuel ratio optimizing system, a gas temperature automatic regulation system, a water level automatic regulation system and a fuel quick regulation system; the adjusting system performs variation adjustment on each parameter in the initial state, and an optimal solution is searched in the adjustment; the adjustment is as follows: by traversing all the states of the history, when the encountered state is optimal under the current condition, the encountered state is defaulted to be the optimal state; and comparing the data with the previous data in sequence, and iteratively updating the data to the current optimal state. The boiler optimized combustion system has the advantages of smaller fluctuation of steam temperature and water level of the boiler, more stable boiler, smaller pressure fluctuation of a gas pipe network and more efficient boiler combustion.

Description

Boiler optimization combustion system

Technical Field

The invention relates to a boiler combustion optimization system, in particular to a boiler combustion optimization system, and belongs to the technical field of boiler combustion optimization systems.

Background

Combustion adjustment in the field of power plant boilers plays a crucial role in overall boiler efficiency, boilers belong to high-energy consumption equipment, small efficiency changes usually correspond to huge economic benefits, and 1% efficiency improvement corresponds to 278 ten thousand yuan of annual benefits taking 220t/h times of high-temperature and sub-high-pressure boilers as an example; the existing gas boiler and mixed combustion boiler are adjusted manually, and the experience, habit, energy and mental state of operators have great influence on the boiler efficiency; the boiler efficiency is improved by standardized operation in the early stage test, but the combustion adjustment is a complex mathematical relationship in which multiple parameters influence each other, different correlations exist among the parameters, and when various controllable and uncontrollable factors such as environment temperature change, fuel change, air composition change, load change and the like change, the optimal operation cannot be simply described by characters; therefore, in view of the great influence of the boiler efficiency on energy saving, emission reduction and efficiency improvement, a new scheme for improving the boiler efficiency is urgently searched.

Disclosure of Invention

In order to solve the problems, the invention provides an optimized combustion system of a boiler, which is rapid in response, can search by itself and is automatically optimized, and has an automatic adjusting system aiming at a multivariable rapid data operation function.

The boiler optimized combustion system comprises a boiler DCS control system; the DCS is connected with an optimizing and adjusting system through OPC communication; the optimizing regulation system comprises a rapid reaction system for regulating the gas pressure, an induced air optimal ratio optimizing system, an air-fuel ratio optimizing system, an automatic steam temperature regulation system, an automatic water level regulation system and a rapid fuel regulation system; the adjusting system performs variation adjustment on each parameter in the initial state, and an optimal solution is searched in the adjustment; the adjustment is as follows: by traversing all the states of the history, when the encountered state is optimal under the current condition, the encountered state is defaulted to be the optimal state; and comparing the data with the previous data in sequence, and iteratively updating the data to the current optimal state.

Preferably, when the adjusting system adjusts, the adjusting system compares the current optimal solution with the previous solution and the next solution, and if the current optimal solution is better than the previous solution and the next solution, the previous state is iteratively updated to the current optimal solution; and in the first step, when the optimal state is finished, automatically and gradually carrying out micro-adjustment on each parameter, comparing the parameters with the original optimal state, and searching for a better state.

Preferably, the regulatory system incorporates a genetic algorithm to obtain a search in the calculation to solve the optimization.

Preferably, the regulation system is built-in with ant colony algorithm.

Compared with the prior art, the boiler optimized combustion system can be adjusted according to original setting during adjustment, automatically searches for the optimal working condition during adjustment, automatically searches for a better solution, has high adjustment speed, high response speed, accurate adjustment, smaller boiler steam temperature and water level fluctuation, more stable boiler, smaller gas pipe network pressure fluctuation, more efficient boiler combustion, more than 1.5 percent of gas boiler coal gas unit consumption and more than 0.5 percent of mixed combustion boiler per ton steam standard coal consumption.

Drawings

FIG. 1 is a parameter schematic diagram of an original gas boiler connected optimized combustion system.

FIG. 2 is a schematic view of the parameters of the prior mixed combustion boiler connected to the optimized combustion system.

Detailed Description

Example 1:

the boiler optimized combustion system comprises a boiler DCS control system; the DCS is connected with an optimizing and adjusting system through OPC communication; the optimizing regulation system comprises a rapid reaction system for regulating the gas pressure, an induced air optimal ratio optimizing system, an air-fuel ratio optimizing system, an automatic steam temperature regulation system, an automatic water level regulation system and a rapid fuel regulation system; the adjusting system performs variation adjustment on each parameter in the initial state, and an optimal solution is searched in the adjustment; the adjustment is as follows: by traversing all the historical states, when the encountered state is optimal under the current condition, the encountered state is defaulted to be the optimal state; and comparing the data with the previous data in sequence, and iteratively updating the data to the current optimal state.

When the adjusting system is adjusted, the previous solution is compared with the previous solution, the next solution is compared with the previous solution, and if the previous solution is better than the next solution, the previous state is iteratively updated to the current optimal solution; in the first step, when the optimal state is finished, parameters are automatically and gradually adjusted in a micro-scale mode, and compared with the original optimal state to find a better state; the regulating system is internally provided with a genetic algorithm to obtain the search for solving the optimization in the calculation; the adjusting system is internally provided with an ant colony algorithm.

Example 1:

an independent automatic optimization searching control system of an optimization operation station with an intelligent early warning system is added, the original DCS is interconnected with a new system through an OPC communication function, and the data below the original boiler are transmitted into the automatic optimization searching control system.

The original data of the gas boiler in the figure 1 are transmitted into an automatic optimization searching control system, the original data of the mixed combustion boiler in the figure 2 are transmitted into the automatic optimization searching control system, and automatic optimization is carried out through the automatic optimization searching control system; the steam drum water level control loop of the gas boiler (1) can be realized; (2) a main steam temperature control loop; (3) load control loop (main steam pressure/blast furnace gas pressure); (4) a hearth negative pressure control loop; (5) the flue gas oxygen content control loop is optimized and controlled, and a steam drum water level control loop (1) of the multi-fuel boiler can be realized; (2) a main steam temperature control loop; (3) load control loop (main steam pressure/coal feed); (4) a hearth negative pressure control loop; (5) a flue gas oxygen content control loop; carrying out optimization control; the optimization control system does not influence the original DCS system; the optimization control system software has the functions of instrument fault diagnosis and operation fault diagnosis, and can automatically switch the optimization control state from 'optimization' to 'manual' once a fault occurs and simultaneously send out a corresponding voice alarm prompt; if the industrial personal computer running the optimization control system fails or crashes, the optimization control system does not transmit data to the original DCS, and the DCS automatically switches the control right from the optimization control system to the DCS through the judgment logic of fault diagnosis and simultaneously sends out corresponding voice alarm prompts; the optimization control system is provided with a one-key cutting-off function key.

The above-described embodiments are merely preferred embodiments of the present invention, and all equivalent changes or modifications of the structures, features and principles described in the claims of the present invention are included in the scope of the present invention.

Claims

1. An optimized combustion system of a boiler comprises a boiler DCS control system; the method is characterized in that: the DCS is connected with an optimizing and adjusting system through OPC communication; the optimizing regulation system comprises a rapid reaction system for regulating the gas pressure, an induced air optimal ratio optimizing system, an air-fuel ratio optimizing system, an automatic steam temperature regulation system, an automatic water level regulation system and a rapid fuel regulation system; the adjusting system performs variation adjustment on each parameter in the initial state, and an optimal solution is searched in the adjustment; the adjustment is as follows: by traversing all the states of the history, when the encountered state is optimal under the current condition, the encountered state is defaulted to be the optimal state; comparing the data with the previous data in sequence, and updating the data to the current optimal state in an iteration mode; when the adjusting system is adjusted, the adjusting system is compared with the previous solution and the next solution, and if the adjusting system is better than the previous solution and the next solution, the previous state is iteratively updated to the current optimal solution; when the optimal state is completed in the first step, automatically and finely adjusting each parameter one by one, comparing the parameters with the original optimal state, and searching for a better state;

the optimization control system software has the functions of instrument fault diagnosis and operation fault diagnosis, and can automatically switch the optimization control state from 'optimization' to 'manual' once a fault occurs and simultaneously send out a corresponding voice alarm prompt; if the industrial personal computer running the optimization control system fails or crashes, the optimization control system does not transmit data to the original DCS, and the DCS automatically switches the control right from the optimization control system to the DCS through the judgment logic of fault diagnosis and simultaneously sends out corresponding voice alarm prompts; the optimization control system is provided with a one-key cutting-off function key.

2. The boiler optimized combustion system of claim 1, wherein: the regulation system has a built-in genetic algorithm to obtain the search for solving the optimization in the calculation.

3. The boiler optimized combustion system of claim 1, wherein: the regulation system is internally provided with an ant colony algorithm.