阅读说明：本技术 一种试剂硫酸生产装置及其工艺 (Reagent sulfuric acid production device and process ) 是由 周建锋 颜志斌 欧阳兆辉 *** 万森博 陈杨 朱传胜 梅志举 于 2019-11-01 设计创作，主要内容包括：本发明公开了一种试剂硫酸生产装置及其工艺,该试剂硫酸生产装置包括；一吸收塔；一循环酸槽,其与所述吸收塔通过管道连接；和一高效换热器,其进酸接口与所述循环酸槽通过管道连接,出酸接口与所述吸收塔通过管道连接；其中,所有过流接触酸的设备管道内壁除所述高效换热器外均为氟塑料材质,所述吸收塔内填料为聚四氟乙烯料,所述高效换热器为板片式强耐腐金属换热器。本发明提供的试剂硫酸生产装置及其工艺,突破现有禁忌,开创用于试剂硫酸生产工艺里,产品合格、占地少、费用低、传热高、且耐压,是试剂硫酸生产工艺中传统氟塑料换热器的更新换代设备。(The invention discloses a reagent sulfuric acid production device and a process thereof, wherein the reagent sulfuric acid production device comprises a reaction tank; an absorption tower; the circulating acid tank is connected with the absorption tower through a pipeline; the acid inlet port of the high-efficiency heat exchanger is connected with the circulating acid tank through a pipeline, and the acid outlet port of the high-efficiency heat exchanger is connected with the absorption tower through a pipeline; the inner walls of the equipment pipelines which are in contact with acid by overflowing are made of fluoroplastic materials except the high-efficiency heat exchanger, the packing in the absorption tower is made of polytetrafluoroethylene materials, and the high-efficiency heat exchanger is a plate-type strong corrosion-resistant metal heat exchanger. The reagent sulfuric acid production device and the process thereof provided by the invention break through the existing contraindication, are originally used in the reagent sulfuric acid production process, have qualified products, small occupied area, low cost, high heat transfer and pressure resistance, and are updating equipment of the traditional fluoroplastic heat exchanger in the reagent sulfuric acid production process.)

1. A reagent sulfuric acid production device is characterized by comprising;

an absorption tower (1);

a circulating acid tank (2) which is connected with the absorption tower (1) through a pipeline; the high-efficiency heat exchanger (5) is characterized in that an acid inlet (54) of the high-efficiency heat exchanger is connected with the circulating acid tank (2) through a pipeline, and an acid outlet (55) of the high-efficiency heat exchanger is connected with the absorption tower (1) through a pipeline;

wherein, all equipment pipeline inner walls of overflowing contact acid are fluoroplastic materials except the high-efficiency heat exchanger (5), the filler in the absorption tower (1) is polytetrafluoroethylene material, and the high-efficiency heat exchanger (5) is a plate-type strong corrosion-resistant metal heat exchanger.

2. The reagent sulfuric acid production device according to claim 1, wherein the plate-type strong corrosion-resistant metal heat exchanger is composed of two-end pressing plates (51), corrugated heat exchange plates (52), sealing rubber strips (53), an acid inlet interface (54), an acid outlet interface (55), clamping studs and nuts (56), a support column (57), a guide rod (58) and a rolling mechanism (59), wherein the corrugated heat exchange plates (52) and the sealing rubber strips (53) are arranged at intervals.

3. The reagent sulfuric acid production device of claim 2, wherein the corrugated heat exchange plates (52) are made of HastelloyC-276; the sealing rubber strip is made of fluororubber F747.

4. The reagent sulfuric acid production device according to claim 2, wherein the corrugated heat exchange plates (52) are a plurality of corrugated thin plates, the plate spacing is 5-7mm, and the plate thickness is 0.5-0.6 mm.

5. The reagent sulfuric acid production device according to claim 2, wherein the reagent acid overflowing part of the plate-type strong corrosion-resistant metal heat exchanger is a corrosion-resistant Hastelloy C-276 and a sealing rubber strip F474, and the acid inlet port (54) and the acid outlet port (55) are sealed by gaskets made of polytetrafluoroethylene or fluorinated ethylene F46; the water side of the corrugated heat exchange plate (52) is sealed by a sealing rubber strip F474.

6. The method of claim 2The reagent sulfuric acid production device is characterized in that the area of the plate-type strong corrosion-resistant metal heat exchanger is 10-20m per ten thousand tons per year²。

7. The reagent sulfuric acid production apparatus according to claim 1, characterized in that a pipeline between the circulating acid tank (2) and the absorption tower (1) is equipped with a circulating acid pump (3).

8. The reagent sulfuric acid production device according to claim 7, characterized in that an acid discharge pipe (4) is arranged on the downstream pipeline of the circulating acid pump (3), and the acid discharge pipe (4) is provided with a ball valve.

9. A process for producing reagent sulfuric acid in an apparatus according to any of claims 1 to 8, comprising the steps of:

step 1, starting a circulating acid pump (3), and conveying a reagent sulfuric acid mother liquor in a circulating acid tank (2) to a high-efficiency heat exchanger (5) for cooling treatment;

step 2, the reagent sulfuric acid mother liquor cooled by the high-efficiency heat exchanger (5) enters an absorption tower (1) to absorb SO from the process gas₃The concentration of the reagent sulfuric acid mother liquor is increased;

and 3, the reagent sulfuric acid mother liquor with the improved concentration flows back to the circulating acid tank (2), purified water is added into the circulating acid tank (2) to maintain the concentration of the reagent sulfuric acid mother liquor unchanged, when the liquid level continuously rises to a certain height, the circulating pump is adopted to open the ball valve of the acid discharge pipe (4) to remove the absorption, and basic mother liquor is left to continue production circulation.

10. The reagent sulfuric acid production process of claim 9, wherein the inner walls of all equipment pipelines in which reagent sulfuric acid mother liquor contacts acid by flowing over are made of fluoroplastic materials except the high-efficiency heat exchanger (5), the packing in the absorption tower (1) is made of polytetrafluoroethylene materials, and the high-efficiency heat exchanger (5) is a plate-type strong corrosion-resistant metal heat exchanger.

Technical Field

The invention relates to the field of industrial production of reagent sulfuric acid, in particular to a reagent sulfuric acid production device using a high-efficiency heat exchanger and a process thereof.

Background

The production key point of the reagent sulfuric acid product is that the purity is not qualified after slight pollution and corrosion, the exothermic reaction is needed, heat is needed to be removed, a proper heat exchanger cannot be found in the prior art, corrosion-resistant plastic Wangma polytetrafluoroethylene F4 or plastic fluo-tetra-hexa F46 shell-and-tube heat exchanger with very low heat transfer coefficient has to be adopted to resist the heat exchange corrosion of the reagent sulfuric acid with harsh purity, and how to make a plastic heat transfer point with small heat transfer coefficient and a durable heat exchanger are researched, so that the heat exchange filament tubes in the plastic polytetrafluoroethylene F4 or F46 shell-and-tube heat exchanger are dense and hemp, and the heat exchange cannot be met, and the cooling effect can be achieved only by using a plurality of parallel-connected series-increased areas. Therefore, the polytetrafluoroethylene heat exchangers of all reagent sulfuric acid production processes are large and incomparable, and each unit with the area of 20m is required for producing ten thousand tons every year²The 20 shell-and-tube heat exchangers are provided with inlet and outlet reagent sulfuric acid and cooling water connecting and distributing pipes, the size of the shell-and-tube heat exchangers occupies a floor of a building, and the plastic is not pressure-resistant and is easy to leak. Particularly, the price of the PTFE material is high, the manufacture is not easy, and the price of each PTFE F4 or F46 heat exchanger is not good. The heat transfer coefficient is too low, and the heat transfer coefficient is too low, so the heat transfer device is a useless choice in the prior art and is also a road barricade for a reagent sulfuric acid production device system.

Disclosure of Invention

The invention aims to solve the technical problem of providing a device and a process for producing reagent sulfuric acid by using a high-efficiency heat exchanger, aiming at the defects in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

a first aspect of the present invention provides a reagent sulfuric acid production apparatus comprising;

an absorption tower;

the circulating acid tank is connected with the absorption tower through a pipeline; and

the acid inlet port of the high-efficiency heat exchanger is connected with the circulating acid tank through a pipeline, and the acid outlet port of the high-efficiency heat exchanger is connected with the absorption tower through a pipeline;

the inner walls of the equipment pipelines which are in contact with acid by overflowing are made of fluoroplastic materials except the high-efficiency heat exchanger, the packing in the absorption tower is made of polytetrafluoroethylene materials, and the high-efficiency heat exchanger is a plate-type strong corrosion-resistant metal heat exchanger.

Further, on the reagent sulfuric acid production device, the plate-type strong corrosion-resistant metal heat exchanger is composed of two-end pressing plates, corrugated heat exchange plates, sealing rubber strips, an acid inlet port, an acid outlet port, clamping studs, nuts, pillars, guide rods and rolling mechanisms, wherein the corrugated heat exchange plates and the sealing rubber strips are a plurality of and are arranged at intervals.

Furthermore, on the reagent sulfuric acid production device, the corrugated heat exchange plate is made of HastelloyC-276; the sealing rubber strip is made of fluororubber F747.

Further preferably, on the reagent sulfuric acid production device, the corrugated heat exchange plate sheet consists of a plurality of corrugated thin plate sheets, the plate sheet spacing is 5-7mm, and the plate sheet thickness is 0.5-0.6 mm.

Further preferably, on the reagent sulfuric acid production device, the reagent acid overflowing parts on the plate-type strong corrosion-resistant metal heat exchanger are all corrosion-resistant Hastelloy C-276 and a sealing rubber strip F474, and the acid inlet interface and the acid outlet interface are sealed by gaskets made of polytetrafluoroethylene or polyfluorinated ethylene F46; the water side of the corrugated heat exchange plate is sealed by a sealing rubber strip F474.

Further, the air conditioner is provided with a fan,on the reagent sulfuric acid production device, the area of the plate type strong corrosion-resistant metal heat exchanger is 10-20 m/ten thousand ton/year according to the cooling water condition of a manufacturer²，

Furthermore, on the reagent sulfuric acid production device, a circulating acid pump is arranged on a pipeline between the circulating acid tank and the absorption tower.

Further preferably, on the reagent sulfuric acid production device, an acid discharge pipe is arranged on a downstream pipeline of the circulating acid pump, and the acid discharge pipe is provided with a ball valve.

The second aspect of the present invention provides a reagent sulfuric acid production process using the apparatus as described above, comprising the following steps:

step 1, starting a circulating acid pump, and conveying a reagent sulfuric acid mother liquor in a circulating acid tank to a high-efficiency heat exchanger for cooling treatment;

step 2, enabling the reagent sulfuric acid mother liquor cooled by the high-efficiency heat exchanger to enter an absorption tower to absorb SO3 from the process gas, SO that the concentration of the reagent sulfuric acid mother liquor is increased;

and 3, returning the reagent sulfuric acid mother liquor with the improved concentration to a circulating acid tank, adding purified water into the circulating acid tank to maintain the concentration of the reagent sulfuric acid mother liquor unchanged, opening an acid discharge pipe valve by using a circulating pump to remove the acid when the liquid level is continuously raised to a certain height, and remaining basic mother liquor to continue production circulation.

Furthermore, in the reagent sulfuric acid production process, the inner walls of the equipment pipelines in flow contact with the reagent sulfuric acid mother liquor except the high-efficiency heat exchanger are made of fluoroplastic materials.

Further, in the reagent sulfuric acid production process, the packing in the absorption tower is polytetrafluoroethylene material.

Further, in the reagent sulfuric acid production process, the high-efficiency heat exchanger is a plate-type strong corrosion-resistant metal heat exchanger.

By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:

according to the reagent sulfuric acid production device provided by the invention, all equipment pipeline inner walls which are overflowed and contacted with acid are made of fluoroplastic materials except the high-efficiency heat exchanger, the filler in the absorption tower is made of polytetrafluoroethylene materials, the high-efficiency heat exchanger is a plate-type strong corrosion-resistant metal heat exchanger, metal is used as a production process of the heat exchanger in a breakthrough manner, and the problems of low heat transfer coefficient, large occupied area, high cost and no pressure resistance of the existing plastic heat exchanger are effectively solved; the heat exchange area of the high-efficiency heat exchanger is less than 1/20 in the prior art, so that the equipment is very small, only one heat exchanger is needed, the number of process devices is greatly simplified, and the high-efficiency heat exchanger becomes the most advanced process for producing reagent sulfuric acid at present; in conclusion, the device and the process for producing the reagent sulfuric acid break through the existing contraindication, are used in the reagent sulfuric acid production process, have qualified products, small occupied area, low cost, high heat transfer and pressure resistance, and are updated equipment of the traditional fluoroplastic heat exchanger in the reagent sulfuric acid production process.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a reagent sulfuric acid production apparatus according to the present invention;

FIG. 2 is a schematic structural diagram of an efficient heat exchanger in a reagent sulfuric acid production device according to the present invention;

wherein the reference symbols are:

1-absorption tower, 2-circulating acid tank, 3-circulating acid pump, 4-acid discharge pipe, 5-high efficiency heat exchanger, 51-pressure plate, 52-corrugated heat exchange plate, 53-sealing rubber strip, 54-acid inlet interface, 55-acid outlet interface, 56-clamping stud and nut, 57-support, 58-guide rod and 59-rolling mechanism.

Detailed Description

The present invention will be described in detail and specifically with reference to the following examples to facilitate better understanding of the present invention, but the following examples do not limit the scope of the present invention.