Automatic control device and method for steam purity of vacuum boiler

Abstract

The invention relates to an automatic control device for steam purity of a vacuum boiler. The automatic control device comprises the vacuum boiler, a gas collecting tank is arranged outside the vacuum boiler and communicated with a heat exchanger chamber of the vacuum boiler through a pipe, the gas collecting tank is arranged in a cooling device, and a gas temperature sensor is arranged on the pipe in front of the gas collecting tank; a hot medium water temperature sensor is arranged in the boiler, and a gas exhaust device is connected to the gas collecting tank; and the above temperature sensor and the gas exhaust device are connected to a control system. According to the automatic control method for the steam purity of the vacuum boiler, the gaseous state and liquid state conversion process of the steam entering the gas collecting tank under the intensified negative pressure of the cooling device in the automatic control device is adopted, when the difference of the temperature value detected by the gas temperature sensor and the temperature value detected by the hot medium water temperature sensor is 15 DEG C, gas exhausting is started, and gas exhausting is stopped when the time set by a system for gas exhausting is up. By means of the automatic control device and method, a good foundation is laid for efficient, stable and long-term running of the vacuum boiler.

Description

technical field [0001] The invention relates to a vacuum boiler steam purity automatic control device and a control method, belonging to the technical field of boilers. Background technique [0002] Since the vacuum boiler itself belongs to the negative pressure operation, the negative pressure in the present invention refers to the pressure lower than the atmospheric pressure. In the vacuum boiler, the heat exchanger is used under pressure, which has great convenience and is widely used. It utilizes the steam under the negative pressure state. Liquefaction releases heat, but in the specific use practice, the problem of the purity of the steam in the boiler is highlighted. Because the vacuum boiler has high requirements on the purity of the steam in the furnace, the heat transfer efficiency of the boiler decreases significantly when there is non-condensable gas, so how to make the boiler Maintaining a good steam purity in the furnace becomes a necessary condition for the sta...

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Problems solved by technology

At present, various boiler manufacturers do not have very effective control methods to maintain the steam purity in the boiler furnace. Some existing steam purity control devices, the collection speed of non-condensable gas is slow, which makes it impossible for the gas to exist in the boiler for a long time, affecting the replacement of the boiler. Thermal efficiency, and because the purity of the steam in the boiler cannot be accurately judged, too frequent intake air pumping causes the vacuum pump to start and stop frequently, and the above-mentioned phenomena cause excessive water vapor to be discharged during the pumping process, resulting in energy waste , so that the energy consumption in the actual operation of the boiler increases, the vacuum pump starts and stops frequently, the equipment and valves are aging, and they are prone to failure. The maintenance requires manpower and material resources, and even the boiler needs to be stopped. Therefore, it is possible to accurately judge and maintain the vacuum in the boiler. Steam purity is the basis for optimal operation of vacuum boilers

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