JPH0375790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a valve assembly for controlling the supply of granular solids, particularly granular solids to a container, e.g. granular coal to a gasifier. A control valve assembly having a poppet-type valve head with purge mechanism, a valve seat and a guide bush for upward feeding.

BACKGROUND OF THE INVENTION The operation of feeding particulate solids into a vessel is well known, for example the operation of feeding coal into a gasifier. For example, US Pat. No. 2,088,679 discloses an operation for feeding solid fuel, such as coal, by a horizontal screw conveyor. U.S. Pat. No. 2,667,409 also discloses a gas generator with a poppet valve at the lower outlet end for removing ash. It is well known that valve seat surfaces for valves that handle particulate solids must be cleaned by a purge operation to ensure proper valve operation.
For example, U.S. Pat. No. 3,703,908 discloses a poppet valve and valve seat arrangement in which the valve seat is purged by injecting gas through the valve seat itself which mates with the valve body. U.S. Pat. No. 4,188,174 discloses an abrasive slurry handling valve whose seat is purged by a cleaning fluid supplied through an annular spout. Also, US Pat. No. 3,470,899 discloses a valve having a guide bush with a purge mechanism.

<Problems to be Solved by the Invention> Considerable efforts have been made to develop control valve devices suitable for stably supplying granular solids to containers, but conventional valve devices have , none of which have been completely satisfactory for application to systems in which particulate solids, such as coal, are fed upwards into vessels such as gasifiers.

It is therefore an object of the present invention to provide a valve assembly for controlling the feed of particulate solids, particularly a particulate solids feed control valve assembly for use in a fluidized bed reactor.

<Means for Solving the Problems> In order to achieve the above object, the gist of the present invention is as follows:
A poppet valve assembly having a valve seat with a purge mechanism for controlling the flow of particulate solids, the assembly comprising: (a) a valve body having a valve seat with a purge mechanism at an outlet end; (b) an elongated pipe extending between the valve body and a packing gland surrounding the valve stem; and (c) a disc-shaped valve head that fits into the valve seat; a tightly mounted poppet-type valve, the valve seat having an annular manifold disposed radially outwardly from the valve seat, the manifold fitting into the valve head. A poppet-type valve assembly having a plurality of outlet ports for directing purge gas flow to a seating surface, the valve stem passing through the packing gland to move the valve head relative to the valve seat. It is in three dimensions.

The poppet valve type assembly is also a solids feed control valve assembly for a fluidized bed reactor, the valve assembly comprising: (a) an elbow passageway extending upstream of the valve seat; ) horizontal screw conveyor means for feeding said particulate solids into said elbow passageway and through said valve seat;

There is also a method for supplying granular solids into a reactor through a control valve, comprising: (a) supplying the granular solids from a supply chute through a horizontal conduit; into the inlet passage of a poppet-type control valve having a valve head and a valve stem attached to the head for controlling the
(b) opening said valve by an amount controlled by a biasing means mechanically attached to the lower end of said valve stem; (c)
A manifold attached to and surrounding the valve head is used to purge and clean the seating surface of the valve body and to prevent the adhesion of particulate solids between the valve head and the seating surface. A method of purging the seating surface by passing gas through a number of spaced apertures.

<Examples> Examples of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a particulate feed control valve assembly 10 is provided for controlling the flow of particulate solids feed upwardly into a fluidized bed reactor 11. As shown in FIG. The valve assembly 10 is attached to the heat-resistant floor 1 of the reactor 11.
3 includes a cast valve body 12 having an elbow-shaped flow passageway 12a embedded therein. The valve body 12 has an annular manifold built therein and a valve seat 14 with a purge mechanism, and purge gas is supplied through a gas flow passage 14a at a connecting portion 14b. A toroidal manifold is disposed radially outwardly from the valve seat 14. The valve seat manifold 14 is
It has a purge gas passage 14a connected at a pipe joint 14b. A valve head 15 shaped to mate with the valve seat and seat on the valve seat surface is rigidly attached to the upper end of an elongated actuator valve stem 16. From the manifold, purge gas passes through at least four equally spaced ports directed radially inward to valve head 15. Actuator valve stem 1
6 is disposed within the elbow valve body 12, and a vertical elongated tube 18 is attached to the base of the valve body 12,
The reactor 11 passes through the filling chamber 19 of the reactor 11.
It extends to a packing land 20 provided outside of the parking lot. The valve body 12 and the valve head 15 are usually
It is made of a casting suitable for high temperature use, such as Hastroy C-276. The actuator valve rod 16 is
It is formed from a thick-walled metal tube with a threaded top end and is attached to the valve head 15. U link 1
7 is fixed to the opposite end of the actuator valve stem 16 and cooperates with pneumatic actuation means (not shown).

The valve seat manifold 14 is provided with a plurality of purge gas outlets opening toward the valve head 15 and spaced apart from each other in the circumferential direction of the manifold. Preferably, at least four of these outlets are equally spaced and open radially inward toward the seating surface of the valve head 15. The purge gas ejected from these outlets removes and cleans the particulate matter adhering to the seating surfaces of the valve head 15 and valve seat 14 that fit together with each other.

The valve head 15 is in the form of a cylindrical poppet attached to an actuator valve stem 16 that cooperates with the valve seat with a purge mechanism and the header 14 at the top end of the elbow valve body 12, thereby forming a valve seat with a purge mechanism. Create a composition.

The actuator valve stem 16 is connected to the lower portion 12 of the valve body 12.
A slight radial clearance space 24 is defined between the actuator valve stem 16 and the lower portion 12b of the valve body, which is adapted to fit closely within the valve body. If desired, a replaceable bushing 25 tightly encloses the valve stem 16 within the lower portion 12b of the larger body.
can be provided. As shown in detail in FIG. 2, the side wall of the valve stem 16 also has at least two
Two purge holes 22 are provided to provide a flow of inert purge gas through the valve stem passageway 16a and the purge holes 22 to clean the annular clearance space 24 and also cool the valve stem 16. . Valve stem 16 and valve body 12 or bush 25
The radial clearance between
0.254~0.762mm (0.010~0.030 inch).

At least one booster air nozzle 26 is provided within the body 12 radially outwardly of the clearance space 24 to facilitate a steady flow of particulate solids through the elbow-shaped passageway 12a of the valve body 12. Below the valve body 12, the vertical pipe 18
includes a T-shaped fitting 28 installed above a packing gland 20 provided for sealing around the valve stem 16. Booster supply air is
A T-fitting 28 provides booster air to the base 12 of the cast elbow valve body 12.
It passes through a booster air nozzle 26 provided at b.

As shown in FIG. 3, the elbow-shaped inlet of the valve body 12 is connected to a conduit 30 extending horizontally to the outside of the reactor 11. As shown in FIG. horizontal conduit 30
A rotatable ribbon mixer and screw conveyor 32 are disposed inside, and one end is connected from the inside by a bearing 34 and a radial support member 34a.
The other end, that is, the outer end, is supported by a bearing 36. Mixer shaft 35 is rotated by suitable means such as a sprocket 37 in cooperation with mechanical drive means (not shown). A granulate feed chute 40 from a granulate hopper rotating aerodynamics (not shown) is connected to the inlet end of the horizontal conduit 30 at a location external to the reactor 11 and above the ribbon mixer and screw conveyor 32. There is. Further, an inlet T-shaped pipe joint 43 for supplying a carrier gas such as air for fluidizing and transporting the granules is connected to a ribbon mixer and a screwdriver on the opposite side from the external feed chute 40 of the reactor 11. The conveyor 32 is connected to the horizontal conduit 30 at its rear end.

Particulate matter such as coal and/or lime is placed in reactor 1
1, the feed chute 40 cooperates with the conveying air supplied at the connection 42.
conveys particulates from inlet fitting 43 through horizontal conduit 30 and into flow passage 12a within valve body 12. Ribbon mixer and screw conveyor 3
2 provides intermittent mixing to prevent particulates from agglomerating in the horizontal conduit 30. The feeding of particulates into the reactor 11 is assisted by booster air ejected from the booster air nozzle 26, for which the flow rate of booster air is
Controlled from outside of 1. A pneumatic actuator (not shown) for selectively moving valve stem 16 and valve head 15 relative to valve seat 14 controls the upward flow of particulates into reactor 11. It is provided outside the vessel 11.

The preferred embodiments of the present invention have been described above, but
This invention is capable of various modifications without departing from its spirit and scope.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the particulate supply control valve assembly of the present invention; FIG. 2 is an enlarged partial cross-sectional view of the lower portion of the valve body of the valve assembly showing the valve stem and purge holes therein; FIG. shows the upper portion of the poppet-type valve assembly and the elbow-like passageway downstream from the screw conveyor arranged to feed particulate solids upwardly into the container. In the figure, 11 is a reactor, 12 is a valve body, 12a is a passage, 14 is a valve seat with a purge mechanism, 15 is a valve head, 16 is an actuator valve stem (valve stem), 18 is an elongated pipe,
20 is packing land, 30 is horizontal conduit, 32
is a ribbon mixer and screw conveyor, 4
0 is the feed chute (supply chute).

Claims (1)

[Scope of Claims] 1. A poppet-type valve assembly equipped with a valve seat with a purge mechanism for controlling the flow of granular solids, the assembly comprising: (a) a valve seat with a purge mechanism at the outlet end; (b) an elongated tube extending between the valve body and a packing gland surrounding the valve stem; and (c) a disc valve head that fits into the valve seat. death,
and a poppet-type valve rigidly attached to the elongate tube, the valve seat having an annular manifold radially outwardly from the valve seat, the manifold fitting into the valve head. a plurality of outlet ports for directing purge gas flow to a mating seating surface of the valve head, and wherein the valve stem passes through the packing gland to move the valve head relative to the valve seat. Poppet type valve assembly. 2. The poppet valve type assembly is a solids feed control valve assembly for a fluidized bed reactor, the valve assembly comprising: (a) an elbow passageway extending upstream of the valve seat; and (b) 2. A valve assembly as claimed in claim 1, including horizontal screw conveyor means for feeding said particulate solids into said elbow passageway and through said valve seat. 3. A method for supplying granular solids into a reactor through a control valve, the method comprising: (a) supplying the granular solids from a supply chute through a horizontal conduit;
(b) mechanically attached to the lower end of the valve stem; (c) purge cleaning the seating surface of the valve body and freeing particulate solids between the valve head and the seating surface; A method of purging and cleaning the seating surface by passing gas through a number of spaced openings in a manifold attached to the seating surface and surrounding the valve head to prevent the valve head.