Boiler Group Controller Dynamic Pressure Deviation Ratio

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Solution Overview

Problem

Existing boiler control systems face challenges in efficiently managing combustion positions and evaporation quantities when the number of operational boilers varies, leading to pressure deviations and inefficient load distribution.

Innovation Solution

A program and controller that calculate the number of operational boilers, combustion positions, and evaporation quantities, adjusting the ratio of pressure deviation to control width to optimize combustion across all boilers, ensuring efficient operation by outputting combustion or standby signals to maintain desired evaporation levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the number of combustion shiftable boilers is increased to handle pressure deviations, then pressure control capability is improved, but the number of available combustion positions becomes insufficient when some boilers are in preliminary can state

Engineering Contradiction:

Improvepressure control capabilityVSAvoidnumber of combustion positions

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The control method dynamically adjusts the control width based on the number of combustion shiftable boilers. When fewer boilers are available (higher preliminary can count), the control width is reduced proportionally, allowing effective pressure control with fewer combustion positions. This dynamic adaptation resolves the contradiction by making the system flexible to varying boiler availability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the control parameter (control width) based on the operational state of boilers. By reducing the control width when the number of combustion shiftable boilers decreases, the system maintains pressure control capability without requiring a fixed number of combustion positions, thus resolving the contradiction between reliability and quantity of combustion positions.

Inventive Principle:

Principle #35Parameter changes

2Ease of operation

If the present time pressure variations are within the allowable pressure width, then pressure control is simplified, but loads become concentrated on fewer boilers reducing operational efficiency

Engineering Contradiction:

Improvepressure control simplicityVSAvoidload distribution efficiency

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The control width is dynamically adjusted based on the number of combustion shiftable boilers. When more boilers are available, the control width is increased, which naturally distributes loads across more boilers while maintaining simplified pressure control logic. This resolves the contradiction by making the system adaptive to boiler availability.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system uses feedback from the number of combustion shiftable boilers to adjust the control width. This feedback mechanism ensures that when more boilers are operational, the control width expands to utilize them for load distribution, while maintaining simple pressure control. This resolves the contradiction between ease of operation and productivity.

Inventive Principle:

Principle #23Feedback

3Device complexity

If fixed control width is used for pressure control, then control logic is simplified, but the system cannot adapt when the number of operational boilers varies

Engineering Contradiction:

Improvecontrol logic complexityVSAvoidadaptability to boiler availability

Core Design Contradiction:

Device complexityVSAdaptability or versatility

Solution Approach 1:

The control width parameter is changed based on the number of combustion shiftable boilers. Instead of using a fixed control width, the system adjusts this parameter dynamically, allowing adaptation to varying boiler availability while maintaining relatively simple control logic. The control width is calculated as a function of the number of available boilers, providing adaptability without excessive complexity.

Inventive Principle:

Principle #35Parameter changes

4Reliability

If the number of preliminary cans is increased to handle failures, then system reliability is improved, but the number of combustion positions becomes insufficient to cover the allowable pressure width

Engineering Contradiction:

Improvefailure handling capabilityVSAvoidnumber of combustion positions

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The control width is adjusted based on the number of combustion shiftable boilers. When more preliminary cans are present (fewer combustion shiftable boilers), the control width is reduced proportionally. This allows the system to maintain reliable failure handling capability while using fewer combustion positions, resolving the contradiction between reliability and quantity of combustion positions.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8682490B2Program, controller, and boiler system

Publication Date: 2014.03.25 MIURA CO LTD

AI summary

A storage medium stores a program which, when executed by a controller, causes the controller to control a boiler group including boilers each of which has a plurality of stepwise combustion positions. The program includes the steps of calculating a number of a presently combustion shiftable boilers, a number of their combustion positions, or a gross evaporation quantity, calculating a deviation quantity between a set physical quantity and a present time physical quantity, calculating a ratio between the deviation quantity and a control width that corresponding to the set physical quantity, and calculating the combustion subject boilers and their combustion positions based on the number of the combustion shiftable boilers, the number of their combustion positions, or the gross evaporation quantity and the ratio.