Pneumatic type automatic control three-way valve

Abstract

The invention provides a pneumatic type automatic control three-way valve. Detachable baffle seats are connected to the upper portion and the lateral surface of a valve T-shaped frame through bolts, a dual-sealing baffle is installed in the baffle seat at the upper portion, and a single-sealing baffle is installed in the baffle seat on the lateral surface. A pneumatic execution mechanism is controlled by a pressure measurement signal and a position switch signal on and under the dual-sealing baffle, and waste gas of a diesel engine is discharged from the lateral surface of the valve in the normal working process. After a starting or fault signal is received, a baffle on the lateral surface is closed, a baffle at the upper portion is opened, and the waste gas passes by. Based on a front-back pressure difference signal of the dual-sealing baffle at the upper portion of the valve and a limiting switch signal in the execution mechanism, the execution mechanism is driven through a pneumatic executor, and linkage of the sealing baffles at the upper portion and on the lateral surface is achieved, so that the pneumatic type automatic control three-way valve is opened and closed reliably, good in sealing performance, simple and compact in structure, quite suitable for the technical field of desulfurization and denitrification of waste gas processing of ships, and also suitable for the field of desulfurization and denitrification of power stations.

Description

technical field [0001] The invention relates to a diesel engine waste gas treatment device, in particular to a waste gas bypass device. Background technique [0002] In the technical field of marine exhaust gas post-treatment, both the selective catalytic reduction (SCR) denitrification system of the marine power plant and the exhaust gas scrubbing and desulfurization system need to arrange a bypass line on the exhaust pipe of the diesel engine. When the exhaust gas post-treatment system fails or is overhauled, the exhaust gas of the diesel engine can be bypassed without stopping the diesel engine. In conventional design, to realize the bypass function, a set of valve systems should be installed on the main pipeline and the bypass pipeline respectively. This arrangement is adopted in the desulfurization system of some power stations. However, this method has great disadvantages: two sets of valve systems are required, and there are many signal points to be collected, which ...

AI Technical Summary

Problems solved by technology

However, this method has great disadvantages: two sets of valve systems are required, and there are many signal points to be collected, which not only leads to the complexity of the control system, reduces the reliability of the system operation, increases the investment and operation and maintenance costs, but also increases the cost of the system. Runtime Space Requirements

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