Abstract
The article is devoted to solving the problem of increasing the efficiency of solid fuel boilers ’ blast control systems. Existing algorithms for calculating losses with outgoing gases, the value of which determines the efficiency of the boiler blow control system, have significant disadvantages due to either high complexity of calculations or insufficient accuracy of the Siegert formula. The authors of the article experimentally confirmed the limitations of practical application of the Siegert formula in the logic of solid fuel boiler blow control systems. To eliminate the identified shortcomings, a new formula for calculating losses with outgoing gases is proposed, which can be used in solid-fuel boiler blast control systems, which has a sufficiently high accuracy and, at the same time, low computational complexity.
Highlights
Solid fuel hot water boilers used in autonomous heat supply systems, as a rule, have a design efficiency of 82..83%
To increase the efficiency of solid fuel boilers, various air supply control systems are used. [1, 2]. All these systems include a gas analyzer that calculates losses with flue gases based on measurements of the flue gas temperature, oxygen (O2), carbon dioxide (CO2) and carbon monoxide (CO) gases
The appearance of the loss curve with flue gases obtained on the basis of thermal calculation suggests that there may be a different formula besides Siegert's formula, devoid of both the drawbacks of Siegert's formula and having less computational complexity compared to thermal calculation
Summary
Solid fuel hot water boilers used in autonomous heat supply systems, as a rule, have a design efficiency of 82..83%. The actual efficiency of boilers, determined by the results of commissioning tests, is lower than the calculated one by 5..20% and fluctuates within wide limits in the course of coal burning. Such a decrease in the efficiency of solid fuel boilers is due to the peculiarities of solid fuel combustion: at the beginning of the cycle, a portion of fuel enters the boiler furnace, which heats up, moisture evaporates from it, and the fuel begins to burn out with a gradual decrease in the amount of burning fuel. All these systems include a gas analyzer that calculates losses with flue gases based on measurements of the flue gas temperature, oxygen (O2), carbon dioxide (CO2) and carbon monoxide (CO) gases
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