CN2108262U

CN2108262U - So3 heat-tube heat-exchanger

Info

Publication number: CN2108262U
Application number: CN 92200145
Authority: CN
Inventors: 刘庸; 刘纪福
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-01-11
Filing date: 1992-01-11
Publication date: 1992-06-24

Abstract

The utility model relates to an SO3 heat-tube heat-exchanger which is arranged between a converter and an absorbing tower in the process of producing sulfuric acid. The utility model is composed of an SO3 heating passage with a baffle plate and a heat tube whose lower part is directly inserted into the SO3 heating passage, and the part of the heat tube in the SO3 heating passage is provided with fins; the part which is not in the SO3 heating passage of the heat tube is provided with a sleeve and iron wire screws, heated SO3 in the passage heats the media in the heat tube, and the heat is taken away and recovered by soft water in a sleeve. The utility model has the advantages of stable performance, simple operation, and high safety, and the utility model can recover waste heat about 100 thousand great calories per hour.

Description

SO3 heat-tube heat-exchanger

The utility model relates to heat exchanger field.

Domestic gas washing in SA production industry was once utilized in the production of general shell-and-tube heat exchanger reclaim sulfuric acid from being transformed into the waste heat that absorbs the operation sulfur trioxide in the eighties, but because the influence that the heat exchanger of this shell-and-tube is concentrated by thermal stress causes the sulfur trioxide leakage problem unresolved, this trial fails.At present in China's sulfuric acid industry, be used for being recovered in the still manque precedent of heat exchanger that is transformed into absorption operation sulfur trioxide waste heat.

The purpose of this utility model is: be not subjected to concentrated influence of thermal stress to guarantee that the heat exchanger of leakage anything but, this heat exchanger are used for producing the UTILIZATION OF VESIDUAL HEAT IN that is transformed into the sulfur trioxide that absorbs operation of sulfuric acid thereby provide a kind of.

The purpose of this utility model reaches like this: a kind of heat exchanger is provided, the heat pipe that this heat exchanger inserts this sulfur trioxide heat tunnel by sulfur trioxide heat tunnel that has dividing plate and lower vertical is formed, said heat pipe two ends have free end, the part that its underpart is inserted in the sulfur trioxide heat tunnel is the finned tube that has fin, outside the sulfur trioxide heat tunnel, be partly with sleeve pipe, between cover inner casing tube and heat pipe, be provided with the iron wire spiral, in heat pipe the water as heat transfer medium of sealing, sleeve pipe is connected by tube connector, soft water flows through from tube connector and sleeve pipe, the assurance sulfur trioxide does not leak and can fully reclaim the contained waste heat of sulfur trioxide gas like this, thereby the purpose of this utility model has just reached fully.

Below in conjunction with accompanying drawing the utility model is elaborated.

Accompanying drawing 1 is the block diagram of part flow process.

Accompanying drawing 2 is this sulfur trioxide heat exchange of heat pipe schematic diagrames.

Accompanying drawing 1 is the part schematic flow sheet of gas washing in SA production. Generally be that metal sulfide is through after burning in the sulfur dioxide generator when producing sulfuric acid, produce sulfur dioxide, sulfur dioxide Catalytic Oxygen by sulfur dioxide in converter is prepared into sulfur trioxide, this sulfur trioxide gas generally is that temperature is the high-temperature gas about 200 ℃, if its entrained heat resource is reclaimed, then can create higher economic benefit, sulfur trioxide enters the absorption tower after lowering the temperature, and forms sulfuric acid with hydrate again. Be recovered in and transform the entrained heat energy of operation and the sulfur trioxide between the absorption operation and must guarantee that sulfur trioxide must not contact with water, also be that sulfur trioxide must not be revealed and be met with water, so the past is unsuccessful with shell-and-tube heat exchanger, exactly because heat pipe is welded among the fixture, contraction is subjected to fixing welded restriction when heat pipe expanded by heating or cooling, makes The impact that heat pipe is concentrated by thermal stress, thus cause leaking. Mutual chemical combination formed sulfuric acid after sulfur trioxide and water leaked, and equipment is further corroded, and made production process be difficult to go on. Shortcoming for above existing technologies, heat exchanger provided by the utility model forms (seeing accompanying drawing 2) by the vertical heat pipe 3 that inserts this sulfur trioxide heat tunnel with its underpart of sulfur trioxide heat tunnel 6 with dividing plate 5, said heat pipe 3 two ends have free end, it is finned tubes with fin 9 that its underpart is inserted in sulfur trioxide heat tunnel 6 interior parts, outside the sulfur trioxide heat tunnel, be partly with sleeve pipe 2, between cover inner casing tube and heat pipe 3, be provided with iron wire spiral 8, the water as heat transfer medium of sealing in heat pipe 3, connected by tube connector 7 between each sleeve pipe 2, soft water flows through in tube connector 7 and sleeve pipe 2.

But from accompanying drawing 2 wind, sulfur trioxide heat tunnel 6 is being provided with dividing plate 5 on upper its hull outside top, heat pipe 3 middle parts are fixed on this dividing plate 5, dividing plate 5 tightly separates sulfur trioxide and the soft water of its outer flow in sleeve pipe 2 in the sulfur trioxide heat tunnel 6, makes sulfur trioxide definitely can not reveal and contact with water. Because the middle part of heat pipe 3 is fixed on the dividing plate 5, make this heat pipe two ends form free end, thereby the shrinkage of reason heat pipe heat is swollen and produce thermal stress and concentrate, therefore, also can not concentrate and not cause breaking or the leakage of sulfur trioxide and water of heat pipe owing to thermal stress, make the sulfuric acid safety in production.

Heat pipe 3 lower vertical are inserted in the sulfur trioxide heat tunnel 6, and become vertical with the flow direction of hot sulfur trioxide gas, thereby the waste heat of sulfur trioxide absorption gas fully, for augmentation of heat transfer, this is partly with fin 9, form finned tube, thereby increased endotherm area and improved heat absorption efficiency.

Heat pipe 3 outside the sulfur trioxide heat tunnel be partly with sleeve pipe 2, between sleeve pipe 2 inner sleeves and heat pipe 3, be provided with iron wire spiral 8, this helix structure can make soft water follow helix to flow, increase the course of flowing, improve the endothermic effect of water.

It in heat pipe the heat transfer medium that is closed in it, this medium kind is a lot, the utility model adopts and be suitable for the water that conducts heat in 40～250 ℃ of this temperature range, hot sulfur trioxide is heated the water of heat pipe bottom, the water rising of being heated, take away with the water cooling in the heat pipe that is heated and with heat by the cold soft water in the sleeve pipe on this heat pipe top, thereby play the heat exchange effect, and handling safety.In addition,, can bear elevated pressures though the caliber of sleeve pipe 2 is less, can in depress reliably and work, thereby also overcome the huge disadvantage of existing heat exchange of heat pipe water tank.

From accompanying drawing 2 as seen, connected by tube connector 7 between sleeve pipe 2, soft water flows through in tube connector and sleeve pipe 2, and the flow direction of soft water is opposite with the flow direction of sulfur trioxide, thereby further improves waste heat recovery efficient.Soft water all is to enter from each sleeve pipe bottom to flow out from its opposite side top after inlet house steward 4 enters again, and is flowed out by outfall sewer 1 at last, so also can improve waste heat recovery efficient.The soft water through heating that flows out from this heat exchanger can reach 85～90 ℃, is introduced to oxygen-eliminating device as heat medium, thereby can saves a large amount of energy.

The utility model sulfur trioxide heat exchange of heat pipe can be recovered in the sulphuric acid process and absorbs a large amount of heat energy that carried by sulfur trioxide between the operation from being transformed into, stable performance, simple to operate, do not moving under the leakage situation, safe and reliable, the heat utilization parameter reaches pre-provisioning request.

Embodiment:

Play the utility model heat exchanger and put into operation in chemical plant, Zhanjiang in September, 1991, and the production test through some months achieves complete success, and its operating parameters is as follows:

Heat exchanger entrance sulfur trioxide temperature～200 ℃

Heat exchanger exit sulfur trioxide temperature～130 ℃

40～44 ℃ of heat exchanger entrance water temperatures

85～90 ℃ of heat exchanger exit water temperatures

Confluent～20 ton/hour

About 1,000,000 kilocalories of per hour recyclable waste heat, sulfur trioxide heat pipe heat exchanging there not being operation under the leakage, bring good economic benefit to enterprise all the time.

Claims

1, the sulfur trioxide heat exchange of heat pipe, be located between the converter and absorption tower of sulphuric acid process, it is characterized in that: said heat exchanger is made up of the vertical heat pipe 3 that inserts this sulfur trioxide heat tunnel with its underpart of the sulfur trioxide heat tunnel 6 that has dividing plate 5, said heat pipe 3 two ends have free end, the part that insert in the sulfur trioxide heating logical 6 bottom is the finned tube that has fin 9, between sleeve pipe 2 inner sleeves and heat pipe 3, be provided with iron wire spiral 8, in heat pipe 3 water as heat transfer medium of sealing, connected by tube connector 7 between each sleeve pipe 2, soft water flows through in tube connector 7 and sleeve pipe 2.