CN201362591Y

CN201362591Y - Steam injection device in waste heat recovery system of sulfuric acid device

Info

Publication number: CN201362591Y
Application number: CNU2009200689409U
Authority: CN
Inventors: 大卫·伦道夫; 罗伯特·菲尔
Original assignee: MECS Chemical Plants Equipment Shanghai Co Ltd
Current assignee: MECS Chemical Plants Equipment Shanghai Co Ltd
Priority date: 2009-03-17
Filing date: 2009-03-17
Publication date: 2009-12-16
Anticipated expiration: 2019-03-17

Abstract

The utility model relates to the technical field of residual heat recovery (or waste heat recovery), in particular to a steam injection device in a waste heat recovery system of a sulfuric acid device, wherein the steam injection device is positioned in front of a heat recovery tower and comprises a container which is open at two ends and is provided with a gas inlet pipe orifice (1) and a gas outlet pipe orifice (4); the container is a steam injection gas duct (2); a two-phase mixing-zone mixing stage (5) which leads the water vapor and the gas to be mixed fully is arranged in the steam injection gas duct (2); an acid condenser separation stage (3) is arranged in the steam injection gas duct (2); in addition, the steam injection device also comprises a steam injector (6). The steam injection device aims at adding the water vapor into the sulfur trioxide gas and ensuring the uniform mixing, so as to reuse the low-pressure steam wasted originally, therefore, the potential heat when the low-pressure steam is condensed is converted into the middle-pressure steam in a heat recovery boiler, thereby improving the steam production rate of the heat recovery boiler.

Description

Steam injection device in a kind of sulfuric acid apparatus residual neat recovering system

Technical field:

The utility model relates to the technical field of (or claiming waste heat recovery) of waste heat recovery in the Chemical Manufacture, relates in particular to relate to be positioned at the preceding steam injection device of heat recovery tower in a kind of sulfuric acid apparatus Waste Heat Recovery System (WHRS).

Background technology;

In the absorption process of the sulfur trioxide gas of sulfuric acid apparatus, adopt the vitriol oil to absorb sulphur trioxide in the gas on the industrial production, and then adding water in absorbing the vitriol oil that back concentration increases, to keep needed acid dense.Traditional sulfuric acid production process is to adopt the concentrated acid of about 80 ℃ of temperature, concentration about 98% to absorb, and the acid temperature after the absorption is about 100 ℃, and adding water in this acid is easily, does not need to realize adding water with special diluter.But the heat that traditional absorption process produces does not have utility value owing to the recycle acid temperature is lower, can only cool off and this heat is arranged to atmosphere with recirculated cooling water.Absorb acid acid temperature if improve, just improved the utility value of this heat.According to the requirement of absorption technique, also needing suitably when improving absorption acid acid temperature, raising absorbs acid concentration.When the gentle acid of absorption acid acid of the heat recovery system that adopts is dense is 220 ℃ and about 99%, under this sour temperature, can adopt thimble-tube boiler to reclaim the steam of the about 1.0MPa pressure of unnecessary heat generation that the sulfur trioxide gas absorption process produces.But under this sour temperature, dense its corrodibility of subtle change of acid will have very big variation.Therefore, in heat recovering process, the homogeneity that adds water is that the dense consistence of acid is most important, be that the recovery of heat diluter adds water so need the special wetting system that adds.

The another kind of method that adds water in system is to add water vapor in the gas of trioxygen-containing sulphur.Before this gas enters heat recovery tower, increase a steam and inject flue and steam injection device thereof, water is injected the gas of this trioxygen-containing sulphur with the steam pattern.Compare with the diluter that adds water, the advantage that adds water vapor at first is the latent heat of vaporization that water vapor has been brought water into, has increased the steam production of heat recovery system; Next is correspondingly to have reduced the amount of water in the recycle acid, thereby has alleviated the load of heat recovery system thin up device.The utility model is exactly the steam injection device that adds water vapor about a kind of in gas.

The utility model content:

The purpose of this utility model is to add water vapor in the gas of trioxygen-containing sulphur, and guarantee that it mixes, thereby the low-pressure steam that originally goes out of use is recycled, latent heat during with this low-pressure steam condensation has converted middle pressure steam in thimble-tube boiler, thereby has improved the steam productive rate of thimble-tube boiler.

In addition, another purpose of the present utility model is the water yield that corresponding minimizing joins diluter, thereby can reduce the specification of diluter and the vibration that slows down diluter.

Another purpose of the present utility model is can reduce by the dense ascending amount of first step filler acid, thereby can reduce the sour internal circulating load by filler, the corresponding specification that reduces the flow and the acid tube road of heat recovery tower acid circulating pump.For the heat recovery system of having built up, can also be by increasing the throughput that a steam injection device improves device.

The purpose of this utility model realizes in the following manner:

Steam injection device in a kind of sulfuric acid apparatus residual neat recovering system, comprise have the gas feed mouth of pipe 1, the container of the both ends open of the pneumatic outlet mouth of pipe 4, this container is that steam injects flue 2, described steam injects to be provided with in the flue 2 and makes water vapor and the well-mixed two phase mixture mixing sections 5 of gas, in injecting flue 2, described steam is provided with condensation acid segregation section 3, be collected in the condensation acid of condensation acid segregation section 3 surface condensations and discharge, thereby reach the purpose that is separated in the condensation acid that produces in the sulfur trioxide gas from the bottom;

Above-mentioned steam injection device also comprises by the vapor injection nozzle the steam injector 6 in the water vapor injecting gas.

The main part that steam injects flue 2 is a vertical vessel normally, is made or is exactly to be formed by the alloy material manufacturing of band coating or liner not by the alloy material of band non-metallic coating or non-metallic inner liner.Steam injector 6 is by injection nozzle, and the steam flow Controlling System of band variable valve and under meter is formed, with the quantity of steam of control injection and the distribution of injecting steam.All water that heat recovery system adds in the recovery of heat diluter originally can inject flue from steam with the form of steam and inject, and certainly according to working condition requirement, steam injects flue and also allows not inject any steam.

Trioxygen-containing sulphur gas can be from this flue top, bottom or the lateral gas feed mouth of pipe enter and be positioned at bottom, top or the lateral pneumatic outlet mouth of pipe from it and go out, promptly can be as shown in Figure 1, the gas feed mouth of pipe 1 injects the top-side of flue, the pneumatic outlet mouth of pipe 4 injects flue at steam bottom sides at steam, or the gas inlet and outlet nozzle position exchanges, as shown in Figure 2, inject flue top and bottom turnover from steam.Steam injector 6 is positioned at the top or the side of this flue, the difference of the direction of steam flow when injecting according to steam, and the mode that steam injects both can become following current also can become adverse current with gas.Promptly when the top that is positioned at this flue as Fig. 1 steam injector, when steam injected downwards, this moment, steam became following current with gas flow; As shown in Figure 2, when the steam injector is positioned at the side of this flue, steam upwards or when side direction was injected, steam became adverse current with the gas main air stream at this moment.

The main part that steam injects flue is a mixing section 5, and the two-phase mixing system that is positioned at mixing section is one group of mechanically mixing device that has corrosion protection coating, with the water vapour that reaches injection and gas gas blended purpose fully.

What be positioned at steam injection flue bottom is a segregation section 3, and it can be ramp structure or horizontal structure, and nonmetal acid corrosion-resistant material lining is adopted in its bottom surface.

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

Description of drawings:

Fig. 1 is the structural representation of embodiment of the present utility model.

Fig. 2 is the structural representation of another embodiment of the present utility model.

Among the figure: the 1-gas feed mouth of pipe, 2-steam inject mixing section, the 6-steam injector of flue, 3-segregation section, the 4-pneumatic outlet mouth of pipe, 5-steam and gas.

Embodiment:

Below in conjunction with embodiment the utility model is described further.

Embodiment 1

Certain produces 900000 tons of copper metallurgical off-gas acid-making devices per year, and the sulfur dioxide concentration of purification system electrostatic precipitator exit gas is 19.3%, and the sulfur dioxide concentration that advances in the convertor gas is 13.6%.Adopt the residual neat recovering system of carrying vapour injection device, about 50% the water that accounts for total amount of water is with the steam injection device of the form injected system of steam.The steam productive rate of this device is that 0.55 ton of steam is produced in acid per ton.

Embodiment 2:

Certain produces 600000 tons of sulphur-burning sulphuric acid plants per year, and the sulfur dioxide concentration that advances the gas of convertor is 11.5%.Adopt the not residual neat recovering system of carrying vapour injection device, the steam productive rate of this device is that 0.46 ton of steam is produced in acid per ton.When increasing the steam injection device at former residual neat recovering system, about 50% water of total amount of water is injected this steam injection device with the form of steam, then corresponding steam gain in yield produces 0.53 ton of steam to acid per ton, and the throughput of the residual neat recovering system of this carrying vapour injection device can improve more than 10% simultaneously.

Though above-mentioned specific embodiment has been described the utility model, this description does not mean that and is construed as limiting.With reference to after the description of the present utility model,, obviously can make various corrections to the disclosed embodiments for person skilled in the art.Various similar correction all falls within the claim scope of the present utility model.

Claims

1. the steam injection device in the sulfuric acid apparatus residual neat recovering system is characterized in that:

Comprise have the gas feed mouth of pipe (1), the container of the both ends open of the pneumatic outlet mouth of pipe (4), this container is that steam injects flue (2), described steam injects to be provided with in the flue (2) and makes water vapor and the well-mixed two phase mixture mixing sections (5) of gas, is provided with condensation acid segregation section (3) in described steam injects flue (2); Also comprise steam injector (6).

2. steam injection device according to claim 1 is characterized in that, it is a vertical vessel of being made by anti-corrosive alloy material that described steam injects flue (2).

3. steam injection device according to claim 2 is characterized in that, it is a vertical vessel of being made by the anti-corrosive alloy material of non-metallic coating or non-metallic inner liner that described steam injects flue (2).

4. steam injection device according to claim 1 is characterized in that, the described gas feed mouth of pipe (1) is positioned at top, bottom or the side that steam injects flue (2); The described pneumatic outlet mouth of pipe (4) correspondence is positioned at bottom, napex or the side that steam injects flue (2).

5. steam injection device according to claim 1 is characterized in that, described steam injector (6) is positioned at napex or the side that steam injects flue (2).

6. steam injection device according to claim 1 or 5 is characterized in that described steam injector (6) is by injection nozzle, and the steam flow Controlling System of band variable valve and under meter is formed.

7. steam injection device according to claim 1 is characterized in that, described mixing section (5) is one group of mechanically mixing device that has corrosion protection coating.

8. steam injection device according to claim 1 is characterized in that, the bottom of described segregation section (3) is ramp structure or horizontal structure, and its bottom and part side surface adopt nonmetal acid corrosion-resistant material lining.