CN202880883U - Quasi isothermal venturi heat energy replacement converter - Google Patents

Abstract

The utility model discloses a quasi isothermal venturi heat energy replacement converter. A high concentration conversion technology in the sulfuric acid production has been an industrial difficult problem. The sulfur dioxide concentration in the modern smelting furnace production is high up to 30%-60%, and the sulfur dioxide with so high concentration can hardly be used in a conversion station and a dry absorption station of a conventional acid preparing system, because the unbalanced quantity of heat is caused, the quantity of heat is difficulty removed by the system, the catalyst failure, the high temperature deformation of equipments, the over-high dry-absorbing acid temperature and the low monolayer percent conversion are caused. The regular production of the system is severely influenced, the quasi isothermal venturi heat energy replacement converter is equipment developed based on equilibrium of reaction as a theory, and the equipment is applicable to the preparation of the sulfuric acid in the sulfur dioxide with the high concentration. A heat exchanger achieves moving out the quantity of heat in the converter continuously in process of sulfuric dioxide oxidizing reaction in the design, and the monolayer percent conversion is improved by about 1.4 times, thereby being beneficial to continuously carry out an exothermic reaction rightwards, and playing a role in protecting a catalyst and the equipment. The equipment provided by the utility model mainly comprises several parts including a housing, a gas distributor, a reaction pipe bundle, a shell pass clamping sleeve, a built-in air duct, a pipe bundle support grid, a built-in venture pre-heater and the like.

Description

A kind of accurate isothermal Venturi heat energy displacement convertor

Technical field

The utility model relates to gas washing in SA production and other heat recovery technology fields, particularly in acid production with sulphur, metallurgical off-gas acid-making, pyrite-based sulfuric acid production and other heat-exchange equipments with SO2 flue gas extracting sulfuric acid.

Background technology

Gas washing in SA production middle and high concentration transformation technology is an industry difficult problem always, along with the progress of smelting technology, and the development of oxygen-rich smelting technology, present many metallurgical furnace kilns have all improved the concentration of smelting exhaust sulfurous gas.What the sulfur dioxide concentration of modern smelting furnace production had can be up to 30%～60%, and so high sulfur dioxide concentration is difficult to enter conversion and the dry absorption section of conventional acid making system, and the individual layer transformation efficiency is excessively low.And can cause heat uneven, system is difficult to heat is well shifted out, and can cause catalyst failure, equipment high temperature deformation, do that to inhale the acid temperature too high, and these all have a strong impact on the normal production of system.

All there is the correlation technique that high density transforms in the offshore companies such as Otto Thailand, Meng Moke at present, all are to reach the purpose that transforms high density sulfurous gas by technological design.The technology of Otto Thailand is the circulating flue gas transformation technology, utilizes one section sulphur trioxide that transform to generate to return one section carrying out that suppresses one section conversion with a certain amount of, reduces one stage conversion, has also controlled one deck temperature out simultaneously.But the high-temperature blower that uses in this technology is expensive, and is fragile, and energy consumption is higher; The high density transformation technology of Meng Moke is a kind of pair of raw material method conversion process, namely adopt two kinds of different unstripped gass, high concentrations of gas and diluent air, allow all diluent airs all be added in the sub-fraction high-concentration fume, mixed gas reacts at one deck, the gas of remaining high concentrations of gas after one deck outlet and pre-inversion mixes, this technique can not surpass the temperature that catalyzer can bear, can obtain the concentration that a comparatively suitable conversion system is produced, but this technique can't be processed sulfur dioxide concentration and surpass 18% flue gas, and actual this kind technique is to have applied for patent by Frenchman Ugine Kuhlmann in nineteen thirty-five.More than two kinds of methods certain limitation is arranged and is unfavorable for energy recovery.

Summary of the invention

The utility model is for the deficiencies in the prior art, provide a kind of effective solution owing to enter the too high system thermal imbalance that causes of the sulfur dioxide concentration of convertor, system is difficult to heat is well shifted out, catalyst failure, equipment high temperature deformation, do the problems such as sour temperature is excessively high of inhaling, greatly improve the individual layer transformation efficiency, and recovery system heat energy well, the accurate isothermal Venturi heat energy displacement convertor of byproduct steam.

The utility model is for solving the problems of the technologies described above, provide following technical scheme: a kind of accurate isothermal Venturi heat energy displacement convertor, it is characterized in that comprising accurate isothermal transformation device, air preheater, described accurate isothermal transformation device comprises housing, arranging up and down in the housing, two tube sheets are separated into three cabins of upper, middle and lower, top, upper cabin offers gas approach, be provided with gas distribution grid under the gas approach, described middle deck is indoor to be provided with some heat-exchanging tube bundles, also fixed seal connection in the corresponding through hole of offering on the tube sheet is stretched at described heat-exchanging tube bundle two ends, be filled with the reaction catalyst in the described heat-exchanging tube bundle, the tube sheet below on top, lower cabin is provided with supportive grid, described housing center is provided with air preheater, air preheater is circular cylinder body, the upper end stretches into that middle deck is indoor to be sealed by upper tubesheet, it is fixing that the sealing of lower cabin is stretched in the lower end, described air preheater comprises housing, arranging up and down in the housing, two tube sheets are separated into three chambers of upper, middle and lower, be provided with some heat-exchanging tube bundles in the middle chamber, the heat-exchanging tube bundle two ends are stretched in the through hole that the lower tubesheet correspondence offers, fixed seal connection, described upper chamber is communicated with the middle cabin of accurate isothermal transformation device, lower chambers is provided with the air intlet pipeline, described middle chamber is communicated with lower cabin, be provided with the preheater chuck on the middle chamber shell, be provided with exhanst gas outlet on the preheater chuck, be provided with external jacket on the described middle deck chamber enclosure, be provided with the airout pipe on the external jacket.

As preferably, offer air-guiding hole on the air preheater upper chamber shell.

As preferentially, offer air-guiding hole on the air preheater middle chamber shell.

For better explaining the technical solution of the utility model, below introduce in detail principle of work of the present utility model: the flue gas that contains sulfurous gas that comes from the outside about 420 ℃ enters from accurate isothermal Venturi heat energy displacement convertor gas approach, after by gas distribution grid flue gas evenly being distributed, enter the indoor heat-exchanging tube bundle of accurate isothermal transformation device middle deck, filled reaction catalyst (catalyzer) in the heat-exchanging tube bundle, after the flue gas that contains sulfurous gas enters the heat-exchanging tube bundle reaction, supportive grid by the lower tubesheet below enters lower cabin, then enter the air preheater middle chamber, enter at last the preheater chuck, send next equipment (two sections convertor or interchanger) that enters by the exhanst gas outlet on the preheater chuck, the flue gas that contains sulfurous gas utilizes the air of percolation between pipe to continue cooling in the process by the indoor heat-exchanging tube bundle of accurate isothermal transformation device middle deck, the heat that will produce in reaction tubes continues to shift out, the air that is used for moving the heat drop temperature enters from the air intlet pipeline on the air preheater lower chambers, after first being entered the reaction flue gas heating of air preheater middle chamber behind the inflow middle chamber, enter upper chamber, because upper chamber is communicated with middle cabin, air after the preheating enters between the pipe of heat-exchanging tube bundle in cabin, high-temperature flue gas lowered the temperature move heat, flow at last external jacket, discharged by the airout pipe, be sent to the operation of byproduct steam.

The beneficial effects of the utility model: the utility model is under the condition of high concentration SO 2 relieving haperacidity, the transformation efficiency of one deck is no better than three layers of transformation efficiency sum of tradition, make simple, greatly reduce cost, and occupation area of equipment is little, saves the space, by utilizing air heat-exchange, the recovery system heat has also effectively prevented the corrosion of heat transfer tube to greatest extent, and range of application is comparatively extensive.

Description of drawings

Fig. 1 is semisectional view of the present utility model.

Embodiment

A kind of accurate isothermal Venturi heat energy displacement convertor, comprise accurate isothermal transformation device 001, air preheater 002, described accurate isothermal transformation device 001 comprises housing, up and down two tube sheets (011 are set in the housing, 012) is separated into three cabins (013 of upper, middle and lower, 014,015), 013 top, upper cabin offers gas approach 016, be provided with gas distribution grid 017 under the gas approach 016, be provided with some heat-exchanging tube bundles 018 in the described middle cabin 014, tube sheet (011 is stretched at described heat-exchanging tube bundle 018 two ends, 012) also fixed seal connection in the through hole that correspondence is offered on, be filled with the reaction catalyst in the described heat-exchanging tube bundle 018, tube sheet 012 below on 015 top, lower cabin is provided with supportive grid 004, described housing center is provided with air preheater 002, air preheater 002 is circular cylinder body, the upper end is stretched in the middle cabin 014 by upper tubesheet 011 sealing, it is fixing that 015 sealing of lower cabin is stretched in the lower end, described air preheater 002 comprises housing, up and down two tube sheets (021 are set in the housing, 022) is separated into three chambers (023 of upper, middle and lower, 024,025), be provided with some heat-exchanging tube bundles 026 in the middle chamber 024, lower tubesheet (021 is stretched at heat-exchanging tube bundle 026 two ends, 022) in the through hole that correspondence is offered, fixed seal connection, described upper chamber 023 is communicated with the middle cabin 014 of accurate isothermal transformation device 002, lower chambers 025 is provided with air intlet pipeline 027, described middle chamber 024 is communicated with lower cabin 015, be provided with preheater chuck 005 on middle chamber 024 shell, be provided with exhanst gas outlet 051 on the preheater chuck 005, be provided with external jacket 006 on 014 shell of described middle cabin, be provided with airout pipe 061 on the external jacket 006, as preferably, offer air-guiding hole 231 on air preheater 002 upper chamber 023 shell, as preferably, offer air-guiding hole 241 on air preheater 002 middle chamber 024 shell.

Claims (3)

1. accurate isothermal Venturi heat energy displacement convertor, it is characterized in that comprising accurate isothermal transformation device, air preheater, described accurate isothermal transformation device comprises housing, arranging up and down in the housing, two tube sheets are separated into three cabins of upper, middle and lower, top, upper cabin offers gas approach, be provided with gas distribution grid under the gas approach, described middle deck is indoor to be provided with some heat-exchanging tube bundles, also fixed seal connection in the corresponding through hole of offering on the tube sheet is stretched at described heat-exchanging tube bundle two ends, be filled with the reaction catalyst in the described heat-exchanging tube bundle, the tube sheet below on top, lower cabin is provided with supportive grid, described housing center is provided with air preheater, air preheater is circular cylinder body, the upper end stretches into that middle deck is indoor to be sealed by upper tubesheet, it is fixing that the sealing of lower cabin is stretched in the lower end, described air preheater comprises housing, arranging up and down in the housing, two tube sheets are separated into three chambers of upper, middle and lower, be provided with some heat-exchanging tube bundles in the middle chamber, the heat-exchanging tube bundle two ends are stretched in the through hole that the lower tubesheet correspondence offers, fixed seal connection, described upper chamber is communicated with the middle cabin of accurate isothermal transformation device, lower chambers is provided with the air intlet pipeline, described middle chamber is communicated with lower cabin, be provided with the preheater chuck on the middle chamber shell, be provided with exhanst gas outlet on the preheater chuck, be provided with external jacket on the described middle deck chamber enclosure, be provided with the airout pipe on the external jacket.

2. a kind of accurate isothermal Venturi heat energy displacement convertor according to claim 1 is characterized in that offering air-guiding hole on the air preheater upper chamber shell.

3. a kind of accurate isothermal Venturi heat energy displacement convertor according to claim 1 is characterized in that offering air-guiding hole on the air preheater middle chamber shell.

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