Control method for improving economical operation of boiler charge returning air blower

Abstract

The invention relates to the technical field of boilers, in particular to a control method for improving economical operation of a boiler charge returning air blower, comprising the following steps: A. deploying three charge returning air blowers (NO.1, NO.2 and NO.3), operating the NO.1 charge returning air blower when the boiler operates normally and leading the rest of the two charge returning air blowers for standby application; B. presetting an exit wind pressure set value at the exit of each charge returning air blower of the boiler; C. installing pressure sensors at the exit of each returning air blower of the boiler, calculating the exit wind pressure mean value of each returning air blower measured by a pressure sensor and comparing the mean value with the set value; and D. initiating the NO.2 charge returning air blower if the mean value is less than the set value. By utilizing the control method for improving economical operation of boiler charge returning air blower, control logic of the operation of the air blowers is optimized, the purposes of saving energy and reducing energy consumption are achieved, and the control objective of safe operation is realized, thus realizing the control logic of leading one charge returning air blower into operation and the rest of the two charge returning air blowers for standby application.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to a control method for improving the economical operation of a boiler return fan. Background technique [0002] The return fan of the circulating fluidized bed boiler is generally designed as two-purpose and one-standby operation. Although the safety factor is high, the cost will also increase if it is operated according to the dual-purpose and one-standby operation, and the goal of energy saving and consumption reduction cannot be achieved. In fact, as long as a single anti-feeding fan is running, the load requirements can be met. However, when the control and debugging personnel design the control logic of the anti-feeding fan, they are programmed according to the two-use and one-standby control scheme required by the boiler manufacturer, and they can run without modifying the control logic. A single fan has a high risk of operation. If the feeding fan trips, the operator does n...

AI Technical Summary

Problems solved by technology

[0002] The return fan of the circulating fluidized bed boiler is generally designed as two-purpose and one-standby operation. Although the safety factor is high, the cost will increase accordingly, and the goal of energy saving and consumption reduction cannot be achieved.

In fact, as long as a single anti-feeding fan is running, the load requirements can be met. However, when the control and debugging personnel design the control logic of the anti-feeding fan, they are programmed according to the two-use and one-standby control scheme required by the boiler manufacturer, and they can run without modifying the control logic. Single fan, high risk of operation

If the feeding fan trips, the operator does not immediately find out that the feeding air pressure drops below 20KPa within one minute, which will directly affect the feeding effect of the feeding device, causing the bed temperature to rise rapidly and the furnace to coke.

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