Manufacturing process of slag lock for coal gasification furnace

Abstract

The invention discloses a coal gasifier slag clock and a manufacturing technology thereof. The coal gasifier slag clock includes a shell, a slag water inlet and a slag water outlet, wherein the shellincludes an elliptical head, a cylinder body and an edge-fold conical head, an upper valve seat is installed on the elliptical head and the slag water inlet, a lower valve seat is installed on the slag water outlet, a guiding device is arranged in the cylinder body, the guiding device includes an upper valve guiding sleeve, a lower valve guiding sleeve, an upper valve rod, a lower valve rod, an upper valve element and a lower valve element, an upper shaft sleeve, an upper supporting ring, a lower shaft sleeve and a lower supporting ring are installed on the cylinder body, an upper driving mechanism used for driving the upper valve rod to slide up and down in a reciprocating mode is installed between the upper shaft sleeve and the upper supporting ring, and a lower driving mechanism used for driving the lower valve rod to slide up and down in a reciprocating mode is installed between the lower shaft sleeve and the lower supporting ring. According to the coal gasifier slag lock, the structure design is reasonable and compact, the manufacturing technology is advanced in technique, manufacturing precision is high, manufactured equipment has the good sealing property, operation is stable in the use process, and the occurrence rate of a breakdown is low.

Description

technical field [0001] The invention belongs to the technical field of Shell coal gasification application, and in particular relates to a manufacturing process of a slag lock for a coal gasification furnace. Background technique [0002] Dry coal powder pressurized gasification clean technology is an advanced coal gasification technology developed by Dutch Shell in 1972 and realized industrial production in 1993. This technology has a wide range of coal types, high coal gasification efficiency and long operation period. , single furnace production capacity, small environmental pollution and other advantages. At present, more than 30 domestic enterprises have adopted this technology to produce hydrogen, synthetic ammonia and methanol. The slag lock is the key equipment in the Shell coal gasification unit. It is mainly used for the ash and slag entry and exit device in the lower section of the gasifier. If the slag lock fails in the Shell coal gasification unit, the slag and...

AI Technical Summary

Problems solved by technology

In the existing technology, the slag lock valve is mostly used to realize the slagging of the gasifier. Under normal circumstances, the slag lock valve generally takes 30 to 40 minutes to discharge the slagging with the gasifier once, and intermittent gasification is required. The slag discharge of the gasification furnace uses the slag lock valve for slag discharge. There are mainly the following points in the process of use: First, when the pressure difference between the pressure of the valve body and the pressure in the gasifier is greater than 0.1MP, the slag lock valve The valve cannot be opened and closed normally, which seriously affects the normal operation of the equipment; second, after a period of operation, fire or slag enters the gap cavity between the valve stem and the shaft sleeve, and after a certain operation period, the ash is easily hardened by moisture Locking the valve stem will affect the normal opening and closing of the valve stem; the third is that coal ash enters the shaft sleeve, which will also increase the friction of the valve stem rotation, which will easily lead to insufficient thrust of the cylinder, causing the valve switch to not be in place, and coal ash entering The valve cavity forms a high-speed pulverized coal turbulent state, which scours and wears the valve body, seriously affecting the service life of the slag lock valve

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