SU982775A1 - Contact apparatus for oxydizing gaseous sulphur dioxide - Google Patents

Description

(54) CONTACT DEVICE FOR SULFUR GAS OXIDATION

The invention relates to chemical engineering, in particular to the structures of contact apparatus incorporated in a plant designed for the catalytic oxidation of sulfur dioxide according to the double contact scheme with intermediate absorption.

A contact apparatus is known, comprising a housing with a central tube, inside of which is placed a catalyst with means for distributing gas flow and an integrated heat exchanger made in the form of radially arranged sections, connected by means of a coaxially mounted collector with a central tube, equipped with a horizontally installed bulkhead part of the body is placed an additional heat exchanger consisting of sections arranged in a row row. The oxidation of sulfur dioxide in an atomic apparatus is carried out on several layers of contact mass located horizontally and occupying the entire cross section of the FROM apparatus.

However, such placement of the contact mass leads to the development of the outer surface of the apparatus and, consequently, an increase in the amount of heat loss to the environment, and also determines the relatively high hydraulic resistance of the layers due to an increase in the rate of gas passing through the layers due to the release of reaction heat during the exothermic oxidation reaction. sulfurous anhydride.

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 The purpose of the invention is to increase the efficiency of the process by reducing heat loss and reducing hydraulic resistance.

The goal is achieved by

15 that the device is equipped with installed and grinding heat exchange sections by cartridges formed by coaxially arranged perforated tubes, between which the catalyst is filled,

20, each cartridge has an annular lid that covers the top of the cartridge, the bottom in the form of a disk, covering the entire section of the cartridge from the bottom and fixed to

25 housing deaf-partition.

FIG. 1 and 2 there are two contact apparatus included in the installation. An overview of FIG. 3 is a section A-L, P of dis-section B-B in FIG. and 2 ; but

30 of FIG. 4 - section bb jia Fig.Z. The device bridges the housing 1 with the lid and bottom, the central pipe 2, which is used as a pipeline, the means of distributing the gas stream 3, under which the intermediate heat exchanger 4 is located after the first layer, made in the form of radially arranged sections, between which are placed the cartridges 5 with contact mass first layer To provide the necessary direction for the passage of sulfur dioxide through the cartridges, the cross section of the contact apparatus above the heat exchanger 4 sections between the cartridges 5 and the housing 1 is closed with a blank partition 6. Below, the heat exchanger 4 has a means for displacing and distributing the gas 7. Under this device there is an intermediate heat exchanger after the second layer , between the sections of which the cartridges with the contact mass of the second layer are placed. The coaxially mounted annular manifold 8 of the intermediate heat exchanger after the second layer is not connected to the central tube, but has a supply pipe 9 and a discharge pipe 10 for gas. Under the sections of the intermediate heat exchanger after the second layer, a device for mixing and distributing gas is installed, after which cartridges with a contact weight of the third layer are installed. The sections of the additional heat exchanger 11 are a vertical bundle of pipes sealed with upper and lower gratings and a casing that form an intertube space with 12 inlet and outlet 13 nozzles. These sections are grouped into two parallel lines arranged in a ring and connected in series along the annular space. woo. The flow of two lines is combined through a pipe 14. connected to the central pipe 2, which is perforated in the places of installation of the intermediate heat exchanger after the first layer, and the ring collector 15 is placed coaxially with the ring collector and. the pipe is equipped with a horizontally installed deaf partition. The second apparatus, which is included in the installation for the catalytic oxidation of sulfur dioxide, has constructive solutions similar to those adopted in the first apparatus, and includes a housing with a central tube, inside which an intermediate heat exchanger after the fourth layer and patrons with a contact mass of the fourth layer are installed, placed between sections of this heat exchanger, a device for viewing and distributing gas after this layer, cartridges with a contact mass of the fifth layer, and an additional heat exchanger. The installation works as follows. Fresh gas from the compressor compartment is supplied to the inlet 12 of the heat exchanger 11 of the first contact apparatus. Pass two lines of additional heat exchanger 11, gas through the pipe. 14 enters the pipe 2, is distributed through the sections of the intermediate heat exchanger 4 and is collected in the upper part of the pipe 2. Then, through the means 3 for distributing the gas flow, the gas is directed to the cartridges 5 with the contact mass of the first layer. At the same time, thanks to the dividing wall b installed between the case of the apparatus 1 and the cartridges 5, as well as the presence of an annular cover on each cartridge (covering the inside of the cartridge between the coaxially arranged perforated tubes, and the bottom in the form of a disk that covers the entire section of the cartridge from the bottom) , the gas is fed into the volume formed by the inner tubes of the cartridges, then the contact mass of the first layer passes radially and exits through the holes on the surface of the outer tubes of the cartridges. If the contact mass in the cartridge, through which the gas passes as it moves radially, increases, despite the increase in gas volume due to the heat of the exothermic oxidation of sulfur dioxide to sulfuric acid, the linear velocity of the passage through the layer of contact mass decreases, which leads to a drop in the hydraulic resistance of the layer of contact mass as a whole. The outgoing gas from the cartridges is sent for cooling into the annular space of the intermediate TeJ logger 4 after this layer. The gas cooled in this heat exchanger to the required temperature passes the means for displacing and distributing the gas 7 and is directed to the cartridges with a contact mass of the second layer, where further oxidation occurs and the corresponding warming up occurs. The heated gas is supplied to the annular space of the intermediate heat exchanger after this layer, where it is cooled to the required temperature. The gas then passes the means for mixing and distributing and enters the cartridges with the contact mass of the third layer, where the first contact zone ends. After the third layer, the gas enters the tube space of two lines of sections of the additional heat exchanger 11, from which it is brought to intermediate absorption. After absorption, gas is supplied to the inlet of the second apparatus and

and then into the inter-space space of an additional heat exchanger, from where it enters the lower part of the central tube, and through it into the tubes of the sections of the intermediate heat exchanger after the fourth layer. The gas is then withdrawn from the second apparatus and, through the inlet 9, enters the tubes of the sections of the intermediate heat exchanger after the secondary layer placed in the first apparatus, exits through the outlet pipe 10 and returns to the second apparatus. Passing the switchgear, the gas is directed to the cartridges with the contact mass of the fourth layer, where it is oxidized and heated accordingly, and the tube space of the heat exchanger after this layer enters the coil where it is cooled to the required temperature. Next, the gas passes the means for mixing and distributing it. n enters the cartridges with a contact mass of the fifth layer where the oxidation process is completed. After the fifth layer, the gas is distributed .- through the tube space of the two lines of the sections of the additional heat exchanger, from where it is sent to the final absorption.

The proposed contact apparatus, equipped with cartridges with conical mass installed between the heat exchanging sections, greatly improves the efficiency of the oxidation process by reducing heat loss and also has a lower hydraulic resistance.

Claims (1)

Invention Formula A contact apparatus for oxidizing sulfur gas, comprising a housing with a central tube, inside which is placed a catalyst with gas flow distribution means and an integrated heat exchanger made in the form of radially arranged sections connected by means of coaxial an installed collector with a central pipe, fitted with a horizontally installed blind partition, and in the lower part of the body an additional heat exchanger is placed consisting of sections arranged around the ring, characterized in that, in order to increase the efficiency of the process by reducing heat losses and reducing hydraulic resistance, the apparatus is equipped with cartridges installed between the heat exchange sections of the Gu1, formed coaxially with perforated tubes, between which catly is filled. congestion, with each cartridge has an annular lid that covers the top of the inner space of the cartridge, the bottom in the form of a disk, covering the entire section of the cartridge from the bottom, and fixed on the case a blank wall. Sources of information taken into account in the examination 1,., USSR Copyright Certificate No. 797755, cl. B 01 J 8/04, 1976. 15 Phage.1 -I 5jL .1 i.