TWI745059B - Modular structure of pre-concentration tower and its manufacturing method - Google Patents

Abstract

The invention relates to a pre-concentration tower modular structure and its manufacturing method. It mainly divides the concentration tower into a bottom layer module, a lower middle layer module, an upper middle layer module and a top layer module. A flange connection part is built between each module layer, and then after the flange connection parts of each module layer are butted, several fasteners or bolts are used to connect; Layer modules, upper middle layer modules, and top modules are assembled layer by layer, so that there is no stress concentration in each module layer. In addition to improving the convenience of installation and maintenance, only the damaged ones are replaced. Module layer, without the need to replace the pre-concentration tower as a whole, in order to meet economic and environmental benefits.

Description

Modular structure of pre-concentration tower and its manufacturing method

The invention relates to the technical field of a stainless steel manufacturing production line pickling process, in particular to the category of a pre-concentration tower modular structure for recycling waste acid and its manufacturing method.

According to the method of recycling waste acid in a relatively large-scale stainless steel rolling pickling line, the "spray roasting method" is often used to regenerate the waste acid to reduce acid consumption and at the same time be environmentally friendly. The one shown in Figure 6 includes a roasting furnace 91, an iron oxide storage tank 92, a conventional pre-concentration tower 93, an absorption tower 94, and a washing tower 95, etc., and pass the waste acid generated from the steel rolling pickling line The roasting furnace 91 is roasted and decomposed at a high temperature, the iron oxide powder generated will flow into and be stored in the iron oxide storage tank 92, and the generated high temperature hot acid gas will flow through the conventional pre-concentration tower 93 and the absorption tower 94 Afterwards, the free acid of the waste acid is recovered, and the regenerated acid is returned to the steel-rolling pickling line to recycle the acid solution, and the washing tower 95 can recover the washing water of the steel-rolling pickling line.

Please cooperate as shown in FIG. 7, where the conventional pre-concentration tower 93 has a first inlet 931 to provide cold waste acid liquid into the tower, and a second inlet 932 provided in the tower will input high-temperature hot acid gas after roasting To preheat the cold waste acid liquid, and finally the high temperature hot acid gas will flow out from a first outlet 933 provided in the tower, and the preheated high temperature waste acid liquid will flow from a second outlet provided in the tower. The outlet 934 flows out to the roasting furnace 91.

Since the interior of the conventional pre-concentration tower 93 will be exposed to acid gas and acid liquid, the inside of the conventional pre-concentration tower 93 contains hydrofluoric acid (HF, concentration 75.8g/l) and nitric acid (HNO3, concentration 252.7g/l) And some metal sludge, so the conventional pre-concentration tower 93 must be integrated with acid-resistant and wear-resistant materials. The lining 935 of the conventional pre-concentration tower 93 is usually made of several corrosion-resistant plastic plates. It is easy to cause damage due to stress concentration at the bending part 936; in other words, because of the conventional pre-concentration The working temperature of the tower during operation is between 90°C and 100°C. If it is shut down, it will drop to room temperature, and the material will be damaged due to stress concentration at the turning point 935 due to thermal expansion and contraction.

Therefore, as long as the bend 936 or other parts of the conventional pre-concentration tower 93 is damaged, the tower body must be replaced as a whole, which is quite inconsistent with economic and environmental benefits. Furthermore, the conventional pre-concentration tower 93 is an integrated structure , It is quite inconvenient to install or dismantle on-site large-scale equipment hanging installation.

Therefore, in view of the problems of the above-mentioned conventional pre-concentration tower, the main purpose of the present invention is to provide a modular structure of the pre-concentration tower and its manufacturing method with a prolonged service life; therefore, the secondary purpose of the present invention is to provide The modular structure of the pre-concentration tower that is easy to repair and install and its manufacturing method.

The modular structure of the pre-concentration tower of the present invention achieves the above-mentioned purpose by using the following technical means: it includes a bottom module, which is set as a conical cylinder, and a first lining is arranged inside the bottom module, and the A first outlet is provided at the bottom; an intermediate layer module is set as a round and straight cylinder and connected to the upper part of the bottom layer module, and a second lining is provided inside the intermediate layer module, and the intermediate layer The module is provided with a first entrance; and a top layer module is set as a circular cover and connected to the upper part of the middle layer module, and a third lining is provided inside the top layer module, and A second outlet is provided on the top; in addition, the corrosion resistance of the third lining is lower than that of the first lining and the second lining.

The middle layer module further includes a lower middle layer module and an upper middle layer module and connected to each other; wherein the lower middle layer module is set as a round and straight cylinder and connected to the bottom layer module The upper middle layer module is set as a round and straight cylinder and connected to the bottom of the top layer module.

A first flange connection part is provided between the bottom layer module and the lower middle layer module, and the first flange connection part is connected with a plurality of bolts.

A second flange connection part is arranged between the lower middle layer module and the upper middle layer module, and the second flange connection part is connected with several bolts.

The superposition height of the bottom layer module and the lower middle layer module is 1/3 of the total height of the pre-concentration tower.

The first inner liner and the second inner liner are made of polytetrafluoroethylene (PTFE) material and the thickness is set between 3mm~5mm; and the third inner liner is made of ethylene-trifluorochloride It is made of ethylene copolymer (E-CTFE) material and the thickness is set between 3mm~5mm.

The technical means used in the manufacturing method of the modular structure of the pre-concentration tower of the present invention includes the following steps: a multi-stage separation of the pre-concentration tower step, which divides the pre-concentration tower into a bottom layer module and a lower middle layer module , A module layer of an upper middle layer module and a top layer module; a connection part of each module layer is built, between the bottom layer module and the lower middle layer module, the lower middle layer module Between the upper middle layer module, and between the upper middle layer module and the top module, a flange connection part is respectively built; a process step of each module layer is to first According to the required shape, an inner lining is pre-integrated and manufactured, and then glass fiber (FRP) is wound around the outer lining of the inner lining and then coated with resin to form the manufacturing, which contains the flange connection parts and their coupling holes , The corrosion resistance of the lining of the top module layer must be lower than that of the lining of the module layer below it; Several fasteners (or bolts) are combined.

In the step of combining each module layer, each flange connection part is provided with a number of positioning pins and positioning holes, and after the coupling holes of each flange connection part are accurately positioned and aligned, a number of fasteners (or Bolt) as a combination.

The manufacturing method of the modular structure of the pre-concentration tower further includes a verification mechanism step, which is to observe the external temperature of the pre-concentration tower during operation with a thermal imaging device. If there is a significant difference in the external temperature, it can be judged that the inner lining is broken.

The present invention uses the above technical means to achieve the following effects:

1. The present invention mainly divides the pre-concentration tower into several module layers such as a bottom layer module, a lower middle layer module, an upper middle layer module and a top layer module, because each module layer does not have any bending Therefore, there is no stress concentration phenomenon in the pre-concentration tower, and the service life of the pre-concentration tower is prolonged.

2. The present invention mainly divides the pre-concentration tower into several module layers, so as to improve the convenience of transportation, installation and maintenance; The whole is replaced, and there is less need to use large-scale equipment to hang and install, and its installation, maintenance, and replacement are quite convenient to meet economic and environmental benefits.

A: Modular structure of pre-concentration tower

B: The manufacturing method of the modular structure of the pre-concentration tower

a: steps

b: step

c: steps

d: steps

1: bottom module

10: The first lining

11: The first exit

2: Middle module

20: second lining

21: First entrance

22: second entrance

23: Lower middle module

24: Upper middle module

3: Top module

30: third lining

31: The second exit

4: The first flange connection

5: The second flange connection

6: The third flange connection

7: Combination hole

8: Bolt

81: positioning pin

9: General waste acid recycling equipment

91: Baking furnace

92: iron oxide storage tank

93: conventional pre-concentration tower

931: first entrance

932: Second Entrance

933: first exit

934: second exit

935: Lining

936: bend

94: Absorption Tower

95: washing tower

Figure 1: is a perspective view of the modular structure of the pre-concentration tower of the present invention.

Figure 2: is an exploded view of the modular structure of the pre-concentration tower of the present invention.

Fig. 3 is a partial enlarged schematic diagram of the exploded view of the modular structure of the pre-concentration tower of the present invention.

Figure 4: is a combined cross-sectional view of the modular structure of the pre-concentration tower of the present invention.

Figure 5: is a flow chart of the manufacturing method of the modular structure of the pre-concentration tower of the present invention.

Figure 6: It is a schematic diagram of the configuration of general waste acid recovery equipment.

Figure 7: is a cross-sectional view of the modular structure of the conventional pre-concentration tower.

First of all, please refer to Figures 1 to 4, which are related to the modular structure A of the pre-concentration tower of the present invention. Uses include: a bottom-layer module 1, a middle-layer module 2, a top-layer module 3, etc. Several module layers, and each module layer is described in conjunction with the drawings as follows.

The bottom module 1 is configured as a conical cylinder, and a first lining 10 is provided inside the bottom module 1, and a first outlet 11 is provided at the bottom; further, the first lining 10 is It is made of polytetrafluoroethylene (PTFE) materials, and these materials have the characteristics of acid and alkali resistance and abrasion resistance.

The middle layer module 2 is set as a round and straight cylinder and connected to the upper part of the bottom layer module 2, and a second lining 20 is provided inside the middle layer module 2, and the middle layer module 2 is provided with a first inlet 21 and a second inlet 22; further, the middle layer module 2 further includes a lower middle layer module 23 and an upper middle layer module 24 and are connected to each other (the second flange connection part 5); Wherein the lower middle layer module 23 is set as a round and straight cylinder and connected to the bottom of the bottom module 1, and the upper middle layer module 24 is set as a round and straight cylinder and is connected to the bottom layer Below the module 3; further, the second inner liner 20 is made of polytetrafluoroethylene (PTFE) material. And the top layer module 3 is set as a circular cover and connected to the upper middle layer module 3 (upper middle layer module 24), and a third inner layer is provided inside the top layer module 3 The lining 30 is provided with a second outlet 31 at the top; the third lining 30 is made of ethylene-chlorotrifluoroethylene copolymer (E-CTFE) material, and these materials It also has the characteristics of acid and alkali resistance and abrasion resistance. In particular, the E-CTFE material used in the third inner liner 30 has a slightly lower corrosion resistance than the PTFE material used in the first inner liner 10 and the second inner liner 20.

Further, a first flange connecting portion 4 is provided between the bottom layer module 1 and the lower middle layer module 23, and the first flange connecting portion 4 is provided with a plurality of bolts 8, and the lower middle layer module A second flange connection portion 5 is provided between the upper middle layer module 23 and the upper middle layer module 24, and the second flange connection portion 5 is connected with a plurality of bolts 8. In addition, the upper middle layer module 24 and the top layer module A third flange connection part 6 is provided between 3, and a number of bolts 8 are arranged in the third flange connection part 6.

Therefore, the present invention provides the best solution for prolonging the service life of the pre-concentration tower. Please refer to FIG. 4, which mainly includes the bottom module 1, the lower middle module 23, the upper middle module 21, and the top module. 3. Depending on the site conditions, the first flange connection part 4, the second flange connection part 5, and the third flange connection part 6 are assembled by a number of bolts 8 layer by layer; , The stack height (h) of the bottom module 1 and the lower middle layer module 21 is 1/3 of the total height (H) of the pre-concentration tower, and the stack height (h) is the highest point of the liquid; On the other hand, if any module layer is damaged, loosen and remove the bolts 8 to replace that module layer. There is no need to replace the pre-concentration tower as a whole.

The aforementioned modular structure A of the pre-concentration tower of the present invention can be completed by the manufacturing method B of the pre-concentration tower structure of the present invention. a. A connection part b for building each module layer, a process step of each module layer, a combination step d of each module layer or/and a verification mechanism step e, etc., and the flow of each step is described as follows: .

The step a of the multi-stage pre-concentration tower is to divide the pre-concentration tower into a bottom layer module 1, a lower middle layer module 23, an upper middle layer module 24, and a top layer module 3.

The connecting portion b of each module layer in the building is between the bottom layer module 1 and the lower middle layer module 23, between the lower middle layer module 23 and the upper middle layer module 24, the A flange connection part is respectively built between the upper middle layer module 24 and the top layer module 3.

The process step c of each module layer is to first integrate the module layer into an inner liner (that is, the first inner liner 10, the second inner liner 20, and the third inner liner 30) according to the required shape. After being out, glass fiber (FRP) is wound around the inner liner and then coated with resin to form it, which contains each flange connection part and its coupling hole 7; in particular, the third inner liner 30 The corrosion resistance performance may be lower than that of the first lining 10 and the second lining 20, and the corrosion resistance performance of the first lining 10 and the second lining 20 may be set to be the same.

The step d of combining each module layer is to connect the flange connecting parts of each module layer with several fasteners (or bolts 8); further, each flange connecting part is provided with several The positioning pins 81 and the positioning holes provide precise positioning and alignment of the coupling holes 7 of each flange connection part, and then several fasteners (or bolts 8) are used for coupling.

The step e of the verification mechanism is to observe the external temperature of the pre-concentration tower during operation with a "thermal imager". If there is a significant difference in the external temperature, it can be judged that the inner lining is broken. In particular, step e of the verification mechanism can verify a new or old pre-concentration tower.

Through the above steps, the bottom layer module 1, the lower middle layer module 23, the upper middle layer module 24, and the top layer module are assembled layer by layer, so that there is no stress concentration phenomenon in each module layer. In addition to improving the convenience of installation and maintenance, only the damaged module layer is replaced without overall replacement, which is in line with economic and environmental benefits.

In summary of the above embodiments, the present invention relates to a "pre-concentration tower modular structure and its manufacturing method", and the structure and construction method steps of its embodiments have not been seen in books or public use, and it is in compliance with the patent application. For the essentials, I implore the Jun Bureau to approve the patent as soon as possible. I really pray for it; For those who need to be clarified, the above are the specific embodiments of the case and the technical principles used. If the changes made in accordance with the concept of the case, the resulting functional effects still do not exceed the spirit covered by the specification and drawings, All should be combined with Chen Ming within the scope of this case.

A: Modular structure of pre-concentration tower

1: bottom module

11: The first exit

2: Middle module

21: First entrance

23: Lower middle module

24: Upper middle module

3: Top module

31: The second exit

4: The first flange connection

5: The second flange connection

6: The third flange connection

7: Combination hole

8: Bolt

Claims (10)

A pre-concentration tower modular structure is provided as a pre-concentration waste acid liquid equipment used in the process of recycling waste acid. A first liner with corrosion resistance is provided with a first outlet at the bottom, wherein the first outlet provides high-temperature waste acid outflow; an intermediate layer module is set as a straight cylindrical body and connected to the bottom layer Above the module, and inside the middle layer module is provided with a second lining with anti-corrosion performance, and the middle layer module is provided with a first inlet and a second inlet, wherein the first inlet provides The high-temperature waste acid flows in, and the second inlet provides cold waste acid liquid to flow in; and a top layer module is set as a circular cover and connected to the upper part of the middle layer module and on the top layer module A third lining with anti-corrosion performance is provided inside, and a second outlet is provided at the top of the third lining, wherein the second outlet provides high-temperature waste acid gas flow out; in addition, the third lining has lower corrosion resistance than the first An inner lining, the second inner lining; the bottom module, the middle module, and the top module are assembled layer by layer, so that there is no stress concentration in each module layer, in addition to improving installation and maintenance In addition to the convenience, only the damaged module layer is replaced without the need for overall replacement, which is in line with economic and environmental benefits. As described in claim 1, the pre-concentration tower modular structure, wherein the middle layer module further includes a lower middle layer module and an upper middle layer module and are connected to each other; wherein the lower middle layer module is set to The round and straight cylinders are connected in parallel above the bottom module, and the upper middle layer module is set as a round and straight cylinders and connected below the top module. The pre-concentration tower modular structure according to claim 2, wherein a first flange connection part is provided between the bottom layer module and the lower middle layer module, and the first flange connection part is connected with a plurality of bolts . As described in claim 2, the pre-concentration tower modular structure, wherein a second flange connection part is provided between the lower middle layer module and the upper middle layer module, and the second flange connection part is provided with a number Bolts. The modular structure of the pre-concentration tower according to claim 2, wherein a third flange connection part is provided between the upper middle layer module and the top layer module, and the third flange connection part is connected with several bolts . As described in claim 3, the pre-concentration tower modular structure, wherein the superimposed height of the bottom layer module and the lower middle layer module is 1/3 of the total height of the pre-concentration tower. The modular structure of the pre-concentration tower as described in claim 1, wherein the first inner lining and the second inner lining are made of polytetrafluoroethylene (PTFE) and the thickness is set between 3mm and 5mm ; And the third lining is made of ethylene-chlorotrifluoroethylene copolymer (E-CTFE) material and the thickness is set between 3mm~5mm. A manufacturing method for the modular structure of the pre-concentration tower includes the following steps: a multi-stage division of the pre-concentration tower step, which divides the pre-concentration tower into a bottom layer module, a lower middle layer module, and an upper middle layer mold The module layer of a top-level module; a connecting part of each module layer is established between the bottom-layer module and the lower middle-layer module, the lower middle-layer module and the upper middle-layer module Between the groups, and between the upper middle-level module and the top-level module, a flange connection part is respectively built; a process step of each module layer is to first combine the module layer according to the required shape An inner lining with corrosion resistance is pre-integrated and manufactured, and then glass fiber (FRP) is wrapped around the outer periphery of the inner lining and then coated with resin. In addition, the corrosion resistance of the inner lining of the top module must be lower than that of the inner lining of the module layer below it; and A bonding step of each module layer is to connect the flange connecting parts of each module layer with a plurality of fasteners; through the above steps, the bottom layer module, the middle layer module, and the top layer module are combined. Assemble layer by layer, so that there is no stress concentration in each module layer. In addition to improving the convenience of installation and maintenance, only the damaged module layer is replaced without overall replacement, which is in line with economy and Environmental benefits. The manufacturing method of the modular structure of the pre-concentration tower according to claim 8, wherein in the step of combining each module layer, each flange connection part is provided with a plurality of positioning pins and positioning holes to provide the After the combination holes are accurately positioned and aligned, several fasteners are used for combination. The manufacturing method of the modular structure of the pre-concentration tower described in claim 8 also includes a verification mechanism step, which is to observe the external temperature of the pre-concentration tower during operation with a thermal imaging device. If there is a significant difference in the external temperature, it can be judged as internal The lining is cracked.

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