JPS5941771B2 - melt reactor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a melt reactor used for reducing sodium sulfate, sodium sulfite, etc., for example.

Conventionally, as a method for reducing sodium sulfate, for example, when it is an aqueous solution, a spray type reaction device has been used to spray the aqueous sodium sulfate solution into a reducing gas and reduce it to sodium sulfide. In addition, when sodium sulfate is a solid substance, a well-known method is to introduce carbon as a reducing agent in a batch kiln and reduce the sodium sulfate at high temperature in the presence of a suitable catalyst.

However, the former method using an aqueous solution of sodium sulfate has problems in terms of economic efficiency because it evaporates a large amount of water and consumes a large amount of energy.

On the other hand, the latter method using solid materials is a batch operation, and the contact between the sodium sulfate and the reducing agent may be insufficient, resulting in low productivity and the inability to carry out the reduction reaction efficiently. In any case, there has been a demand for the development of an apparatus that allows reactions such as reduction of sodium sulfate to be carried out reliably and efficiently.

The inventors of the present invention have conducted various experiments to meet the above-mentioned needs, and have found that, for example, when reducing sodium sulfate or sodium sulfite, they are melted and the melt is finely dispersed in a reducing gas under appropriate conditions. They also discovered that by bringing this into intense contact with the above-mentioned reducing gas on the surface of the furnace, sodium sulfate and sodium sulfite can be reduced in a short time, and based on this knowledge, they completed the present invention by embodying a reaction device. The present invention can be effectively used for the reduction of sodium sulfate and sodium sulfite, and other reactions between molten materials and gas bodies, and can perform these reactions reliably and efficiently. It is an object of the present invention to provide a melt reactor that has high productivity, can reduce reaction costs, has a relatively simple structure, and can be manufactured at low cost.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes a horizontal cylindrical reactor main body, one end surface of which is closed, and the other end surface is open to form a reactant outlet 2.

3 is disposed above the reactor main body 1, and a small diameter cylindrical throat portion 5 is integrally connected to the lower end of the upper cylindrical portion 4 whose lower side is formed into a funnel shape, and a hollow conical throat portion 5 is provided at the lower end of the upper cylindrical portion 4. This is a Venturi-type reactor main body in which diffuser parts 6 of the shape are integrally connected, and the lower end of the diffuser part 6 connects the axis of the reactor main body 3 with the reactor main body 1.
It is arranged in a plane substantially perpendicular to the axis of the reactor main body 1 and along a substantially tangential direction of the outer surface (outer peripheral surface) of the reactor main body 1, and is connected to the reactor main body 1.

A cover plate 7 is disposed on the upper end surface of the reaction apparatus main body 3, and the upper end opening of the reaction apparatus main body 3 is closed by the cover plate 7.

Further, a ring-shaped tray 8 that projects in the axial direction is provided on the inner surface of the funnel-shaped inclined wall 4a of the upper cylindrical portion 4, and a melt exchange portion 9 is formed between this tray 8 and the inner circumferential surface of the upper cylindrical portion 4. It is formed.

The lid plate 7 has an opening at a fixing location opposite to the melting portion 9, and a solid matter population 10 is formed there.

A combustion furnace 11 has a burner 12 attached to one end thereof, and one end of a main duct 13 is connected to the other end of the combustion furnace. The upper part of the upper cylindrical part 4 of the reactor main body 3 (the above-mentioned (above the upper end of the tray 8).

One end of a sub-duct 14 is connected to a predetermined location of the main duct 13, and the other end of the sub-duct 14 communicates with a manifold 15.

Then, a plurality of (
The other end of the blowing nozzles 16 and 16 (two in Fig. 1) is
The axes of the blowing nozzles 16 and 16 are arranged in a plane substantially perpendicular to the axis of the reactor main body 1 and along a substantially tangential direction of the outer surface (outer peripheral surface) of the reactor main body 1, and the reaction is carried out. It is connected to approximately the middle part of the furnace body 1.

Next, the operation of the melt reactor constructed as described above will be explained, taking as an example the case where sodium sulfate is reduced.

First, when solid sodium sulfate is supplied from a solid population of 10, this solid sodium sulfate falls into the melting exchange section 9 located just below the solid population of 1°.

At the same time, for example, kerosene and a smaller amount of air than the theoretical air amount are supplied into the combustion furnace 11 from the burner 12.
A high-temperature reducing gas is generated in the reactor body 3 and is blown into the reactor body 3 from above the melting exchange section 9 through a main duct 13 connected to the upper cylindrical portion 4 of the reactor body 3.

Then, the reducing gas introduced into the reactor body 3 flows along the inner circumferential surface of the cylindrical portion 4, and the solid sodium sulfate present in the box 8 is melted by this high-temperature reducing gas, and the reducing gas is The liquid level of the molten salt is made almost uniform by the intense swirling flow, and the molten salt overflows the tray 8 and is uniformly flowed from the upper edge of the tray 8.

This overflowing molten salt flows inside the upper cylindrical portion 4 while coming into contact with the reducing gas, and reaches the throat portion 5 having a small diameter cylindrical shape.

Here, the flow rate of the reducing gas is increased to disperse the molten salt, and the molten salt and the reducing gas are mixed, so that the molten salt is activated.

The molten salt activated to smoothly carry out the reaction within the reactor main body 1 is introduced into the reactor main body 1 through the diffuser portion 6 together with the reducing gas.

The molten salt and reducing gas introduced into the reactor main body 1 from the diffuser part 6 move while rotating along the inner circumferential surface of the reactor main body 1, and move from the main duct 13 to the sub duct 14 and the manifold 15. The reducing gas supplied from the blowing nozzle 16.16 into the reactor body 1 through the reactor body 1 swirls along the inner peripheral surface of the reactor body 1.

Therefore, the molten salt is vigorously contacted and mixed with the reducing gas, and the reaction proceeds rapidly, ensuring and almost complete reduction reaction, resulting in a higher yield of sodium sulfide and sodium carbonate (reduced) than molten sodium sulfate. ) is obtained when carbon monoxide is used as the gas.

The molten soda sulfide, etc. and gas generated by the reduction are discharged from the reactant outlet of the reactor main body 1, and the gas after the reaction is released into the atmosphere after passing through the dust removal process, or heat is recovered from the reaction gas. It is supplied to and used in an evaporator or waste heat boiler to carry out this process.

Hereinafter, a usage example in which the above-mentioned apparatus is used to reduce sodium sulfate will be specifically described.

〔Example of use〕

Equipment specifications Horizontal cylindrical reactor body: Inner diameter 300W Length 1200
m Pentieri-type reactor main body upper cylindrical part: Inner diameter 500 M (large diameter part) Height 500vrm Throat part: Inner diameter 70rmn Height 50
Part of the diffuser: Discharge port size 70mm x 200m
+++ Combustion furnace (gas generating furnace): Kerosene combustion capacity 10t/h
rUsing an apparatus with the above specifications, anhydrous sodium sulfate (with a water content of approximately 0.5%)
8.5KIi/hr using rotary pulp to prevent air from entering the solids (soda sulfate) from the solids inlet.
was supplied into the reactor main body at a ratio of 1, and dropped into the melt pool.

On the other hand, kerosene was supplied to the combustion furnace at a rate of 5.04/hr in a state where air was insufficient by about 20% relative to the theoretical air amount.

The temperature of the generated reducing gas at the exit of the combustion furnace is 1100℃
Met.

Then, the reduction reaction was carried out as described above.

At that time, the reduction rate was 10.1% to soda carbonate, 82.5% to sodium sulfide, and the rest was unreacted matter, so the reduction rate was high and the molten sulfate was sufficiently dispersed in the reactor body and converted into reducing gas. It was found that when mixed and brought into an active state, the reduction reaction rapidly progressed due to intense contact with a sufficient amount of reducing gas within the reactor body.

In the above embodiment, the reactor main body is formed into a horizontal cylindrical shape, but it may also be formed into a vertical cylindrical shape with a reactant outlet formed at the lower end. Disposed in a plane substantially perpendicular to the axis of the vertical cylindrical reactor main body and along a substantially tangential direction of the outer surface of the vertical cylindrical reactor main body, and connected to the upper end side of the vertical cylindrical reactor main body. be done.

Further, the shape of the reactor body may be a hollow cone shape in the case of salts having poor fluidity, and other configurations may be modified in various ways without departing from the gist of the present invention.

As explained above, in the present invention, a melt reservoir is formed in the upper part of the reactor body, and a solid inlet is formed in the reactor body to introduce a solid reactant into the melt reservoir. At the same time, a combustion furnace that blows hot gas from above the melt pool is arranged with its axis in a plane substantially perpendicular to the axis of the reactor main body and substantially tangential to the outer surface of the reactor main body. and is connected to the reactor main body, while at the lower part of the reactor main body, the reactant in the melt pool melted by the hot gas and the hot gas are introduced into the interior to cause a reaction. The reactor body is connected to
And since the axis of the reactor body is disposed in a plane substantially perpendicular to the axis of the reactor body and along the substantially tangential direction of the outer surface of the reactor body, the supplied solid The reactants are reliably melted in the melt pool by the hot gas blown along the inner wall of the reactor main body, and the reactants are melted by the intense swirling flow of the hot gas along the inner wall of the reactor main body. The liquid level is almost uniform, and the molten reactants are introduced along the inner wall of the reactor main body while fully contacting and mixing with the hot gas to be activated. Sufficient dispersion and intense swirling flow occur to ensure intense and reliable gas-liquid contact, thereby rapidly and significantly promoting reactions and combustion, ensuring that these reactions and combustion occur reliably and efficiently. It has the advantages of high productivity, low reaction costs, and relatively simple structure and low cost production. It is effectively used in reactions with

[Brief explanation of drawings]

The drawings show preferred embodiments of the invention, FIG.
2 is a cross-sectional view taken along line -I, and FIG. 2 is a cross-sectional view taken along line -X in FIG. 1...Reactor main body, 3...Reactor main body, 9...00. Melt pool, 10. ,, solids inlet, 118. ... Combustion furnace.

Claims (1)

[Claims] 1. A melt reservoir is formed in the upper part of the reactor main body, and a solid inlet for introducing a solid reactant into the melt reservoir is formed in the reactor main body, and the upper side of the melt reservoir is formed in the reactor main body. A combustion furnace into which hotter gas is blown is connected to the reactor main body with its axis arranged in a plane substantially perpendicular to the axis of the reactor main body and substantially tangential to the outer surface of the reactor main body. On the other hand, a reactor main body is connected to the lower part of the reactor main body, and the reactor main body is connected to the reactor main body which introduces the reactant in the molten material reservoir melted by the above hot gas and the hot gas to cause a reaction, and A molten reactor characterized in that the axis of the reactor main body is disposed in a plane substantially perpendicular to the axis of the reactor main body and along a substantially tangential direction of an outer surface of the reactor main body.