SU998817A1 - Apparatus for cleaning gases - Google Patents

Description

The invention relates to a device for sanitary cleaning of emissions, containing organic compounds and, in particular, emissions of waste air from oxygen-depleting oxidative petrochemical synthesis, and can be used in the chemical, petrochemical and other industrial sectors.

A device is known that comprises a housing with upper and lower covers, a burner located in the lower cover, an annular tube heat recuperator and, horizontally arranged, shelf catalytic baskets 1.

However, the shelf baskets in this design have a small gas filtration surface, which limits the capacity of the device or requires a considerable thickness of the catalyst layer with increasing costs, and the result is an increase in flow resistance.

The closest to the invention in technical essence and the achieved effect is a device for gas purification, comprising a housing

with upper and lower lids, - a furnace with a mixing unit and burners assembled on a plate, an annular shell-and-tube heat recuperator with a purified gas collector and catalyst baskets 2.

The drawbacks of the device are insufficient utilization of heat from the purified purified gases (the extensive testing of the device showed outlet temperatures of about 240260 s, and to maintain the combustion, cold air is supplied to the burner, which reduces the overall thermal efficiency).

15

Experimental testing The operation of the device showed that at full load of the device with respect to emissions, the temperature in the furnace exceeds the limit established by the regulations. In that

20 case, the bottom cover is unduly extended.

The device is not protected from cases of a short-term increase in the concentration of organic compounds.

25 in emissions and critical, which usually leads to their fiery burning on the catalyst and deactivation of the latter. In addition, there may be emergency prekrgitseni filing emissions into the device, such as

the production of phenol and acetone, which can also cause the excess temperature in the mash zone to be allowed due to the entry of flue gases without dilution.

The aim of the invention is to increase the efficiency of the cleaning process (by supplying warm air to the burners heated by the exhaust clean gases ;, reliability of operation by eliminating the effect of high temperatures on the structural elements and the catalyst.

This goal is achieved by the fact that in a gas purification device comprising a housing with upper and lower lids, a furnace with a mixer unit and burners mounted on a plate, an annular shell-and-tube heat exchanger with a collector of purified gas and catalyst baskets, the collector of the purified gas is equipped with a tubular coil, the outlet of which is communicated through the air inlets to the burners, in the lower lid between the furnace and the burner plate a cavity is formed, communicating with the furnace, and under the catalytic baskets there is a mount Vans, rasshllitelnymi pipe heads.

The drawing shows a device for cleaning gases.

The device comprises a housing 1, an upper 2 and a lower 3 crank, a fire chamber. 4 with a mixing unit 5 and burners o assembled on a plate 7, an annular shell-and-tube heat exchanger 8, whose pipes are rigidly fixed at the top in a tube sheet 9 and fixed to a floating head at the bottom 10 with nozzles 11 brought out of the purified gas through the gland seal and catalyst baskets 13 are conical with a catalyst, under which pipes 14 with spray heads and inlet pipe 15 are connected.

 Case 1 is equipped with nozzles 16 and 17 for supplying and removing cleaned and purified gas, respectively, with a cap 18. Cover 2 has a nozzle 19 with a protective explosive membrane 20 / Collector 12 of purified gas is equipped with a tubular coil 21 with an inlet nozzle 22. The output end is connected through a manifold 23 pipes 24 with burner air supply connections 25. The fuel gas enters connection nozzles 26. The bottom cover 3 and the plate 7 form a cavity 27, which is connected by pipes 28 to the furnace, and connection nozzle 29 is connected to the raw gas supply pipe (not shown),

The device works as follows.

The unpurified gases enter through the nozzle 16 into the annular space of the heat recuperator, then, partially heated, pass to the mixing unit 5, from where they are throttled through openings for mixing with the flue gases. In the case of emissions depleted in oxygen, blown gas burners with forced reagent supply are used. The fuel enters through nozzles 26 into the nozzles — air, the inlet 11Д1й to nozzle 22, passes the tubular coil 21, is heated by the heat of burning purified gases, and enters the burner through nozzle 25.

Fuel is released in the burner embrasure. Observation of combustion is carried out through Chapter 18. Flue gases, mixed with. raw gases and ensuring the temperature of the start of the reaction, come under the catalyst basket. The passage of the catalyst, organic impurities flamelessly burned on the catalyst. In cases where the concentration of impurities in the emissions is higher than the critical one, the temperature in the catalyst zone begins to increase. This can also occur in the event of abnormal supply of raw gases. After exceeding the set temperature limit, a temperature sensor is triggered and a pump (not shown) is turned on, which supplies water condensate from the tank (not shown through pipe 15 to pipes 14, sprayed through the heads under the catalyst baskets 13. Condensate consumes heat for evaporation and overheating , reduces the temperature in the catalyst mash zone, which eliminates the deactivation of the catalyst.

The cleaned gas after the catalyst baskets passes through the tubular space of the annular shell-and-tube reheater 8 and the purified gas manifold 12 with a tubular coil 21, giving off heat to the incoming raw gases and air on the mountain outside. Using the invention will ensure cost-effectiveness and reliability of the device, due to the reduction in consumption fuel, protection of the catalyst from decontamination by the supply of condensate and ensuring uninterrupted operation, which in turn exclude pollution of the atmosphere with toxic organic compounds.

Claims (1)

Invention Formula A gas cleaning device, comprising a housing with upper and lower lids, a fire chamber with a heating unit and burners mounted on a plate, an annular shell and tube heat recuperator with a purified gas collector and catalyst baskets, ex. something so.