Novel anti-corrosion device for steam system of byproduct steam graphite synthesis furnace

Abstract

The utility model relates to a novel byproduct steam graphite synthesis furnace steam system corrosion-resistant device, which comprises a flash evaporation structure and a synthesis structure, the flash evaporation structure is connected with the synthesis structure through an ascending pipe and a return pipe, a first flange is arranged outside the ascending pipe contacted with the flash evaporation structure, a bent pipe is arranged inside the ascending pipe, and the lower half part of the return pipe is a U-shaped pipe. The first flange is arranged to facilitate follow-up maintenance and replacement of the ascending pipe or the flash evaporation structure, the internal elbow is arranged to avoid the situation that wet steam directly hits the tank wall due to the too high flow speed, so that the inner wall of the flash evaporation structure is locally thinned, and the service life of the flash evaporation structure is affected; the condenser pipe can be effectively prevented from entering and being combined with steam to generate bubbles, corrosion and cavitation of a pipeline and the flash tank are caused, and the safe operation of the flash tank is not influenced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the synthetic furnace engineering technical field, concretely relates to novel byproduct steam graphite synthetic furnace steam system anticorrosion device. BACKGROUND

[0002] The flash tank and the pipeline system of the two-in-one graphite hydrogen chloride synthetic furnace are commonly used for sewage discharge of the synthetic furnace flash tank and steam heat recovery of superheated water. The graphite synthetic furnace generates flash steam in the flash tank, and then the flash steam is introduced into a low-pressure steam pipeline to be sent to a steam user. Therefore, the flash tank and the pipeline system need to bear a large amount of material scouring and corrosion of the inner wall of the medium in the use process, and are prone to corrosion damage such as cavitation and pitting.

[0003] The wet steam inlet pipe of the graphite synthetic furnace flash tank has no anti-scouring device, and the wet steam flow rate is too large, which directly hits the tank wall and causes local thinning of the tank wall due to erosion. The wet steam is a gas-liquid mixture, and the scouring and corrosion phenomenon of the pipeline and the storage tank; during the production and operation of the synthetic furnace, the steam condensate in the flash tank return water pipeline is mixed with steam, and bubbles are formed in the pipeline or the flash tank, the bubbles break in the pipeline or the flash tank, causing corrosion and cavitation of the pipeline and the flash tank, which affects the safe operation of the flash tank. There is no pressure drop between the feed pipeline of the graphite synthetic furnace flash tank and the flash tank, and the byproduct steam of the synthetic furnace forms flash in the riser pipe, causing vibration and cavitation of the riser pipe and the flash tank.

[0004] In summary, the existing technology has the problems of inner wall corrosion affecting the service life of the equipment, corrosion and cavitation of the flash tank steam system pipeline and the flash tank body, which increases the safe operation time of the flash tank and causes corrosion and vibration of the steam riser pipe. SUMMARY

[0005] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] Therefore, the utility model aims at providing novel byproduct steam graphite synthetic furnace steam system anticorrosion device, can solve the prior art exists inside wall corrosion influence equipment's service life, flash tank steam system pipeline and flash tank body corrosion cavitation, make the safe operation time of flash tank increase and the corrosion and vibration of steam ascending section pipeline problem.

[0007] Optionally, the ascending pipe adopts DN250 pipe, is connected through the first flange and the upper half portion of the side of the flash structure, the other end is connected with the steam section on the synthetic structure, the steam section is located in the middle of the synthetic structure, the upper portion of the return pipe is connected with the lower half portion of the side of the flash structure through the second flange, the other end is connected with the upper half portion side of the combustion section of the synthetic structure, and the combustion section is located in the lower half portion of the synthetic structure.

[0008] Optionally, the bend is a downward 45° elbow.

[0009] Optionally, the lower 3m of the intersection of the return pipe and the combustion section is provided with a water supply opening, and the lowest point of the U-shaped pipe on the return pipe is lower than the water supply opening by 0.3m.

[0010] Optionally, the ascending pipe and the first flange are connected through a flange connection flow limiting orifice plate.

[0011] Optionally, the flow limiting orifice plate is DN150.

[0012] In summary, the utility model has at least one of the following beneficial effects:

[0013] The utility model through the original DN200 pipe changes DN250 pipe, has increased the ascending pipe cross section, and the downward 45° bend reduces the impact and corrosion of too large pressure on the inner wall of equipment, prolongs the service life of equipment, and the setting of the flange can reduce the number of non-planned parking maintenance of synthetic furnace.

[0014] The utility model through the U-shaped pipe on the return pipe design effectively prevents the condensed liquid pipe from leaking into steam, increases the safe operation time of flash tank, and the design of the flow limiting orifice plate makes the steam flash in the flash tank, reduces the corrosion and vibration of the steam ascending section pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0016] Fig. 1 It is a whole structure schematic view of the novel byproduct steam graphite synthetic furnace steam system corrosion-resistant device of the present application.

[0017] Fig. 2 It is a flash tank structure schematic view of the novel byproduct steam graphite synthetic furnace steam system corrosion-resistant device of the present application.

[0018] Fig. 3 It is a synthetic furnace structure schematic view of the novel byproduct steam graphite synthetic furnace steam system corrosion-resistant device of the present application.

[0019] List of figure marks: 1, flash structure; 2, synthetic structure; 3, backflow pipe; 4, rising pipe; 5, flash furnace; 6, elbow pipe; 7, first flange; 8, widened pipe; 9, flow limiting orifice plate; 10, second flange; 11, cooling section; 12, steam section; 13, combustion section; 14, water supplementing opening. DETAILED DESCRIPTION

[0020] The drawings will be described in detail below. Figs. 1-3 The present application will be further described in detail.

[0021] Embodiment one, refer to the drawings Figs. 1-3, in order to solve the prior art in the prior art, the inner wall corrosion affects the service life of the device, the flash tank steam system pipeline and the flash tank body are corroded and cavitated, the safe operation time of the flash tank is increased, and the corrosion and vibration of the steam rising section pipeline are solved. The utility model discloses a novel by -product steam graphite synthetic furnace steam system anti -corrosion device, comprising, synthetic structure 2 and flash structure 1, synthetic structure 2 is from below to above respectively combustion section 13, steam section 12 and cooling section 11, the upper side of flash structure 1 is connected through rising pipe 4 and steam section 12, and the lower side of flash structure 1 is connected through reflux pipe 3 and the upper half of combustion section 13. The original DN200 is replaced by DN250 to increase the cross section area to reduce the flow velocity, the rising pipe 4 is divided into three sections, the first section is the part connected with the steam section 12, the second section is the part between the flow limiting orifice plate 9 and the first flange 7, and the third section is the first flange 7 and the elbow pipe 6. The third section is provided with a widened pipe 8, and the elbow pipe 6 is a downward 45 DEG elbow inside the flash structure 1. When the wet steam passes through the elbow pipe 6 of the rising pipe 4 of the flash structure 1, it enters the inside of the flash structure 1 and sprays downward to the liquid surface in the inside of the flash structure 1, reducing the impact and corrosion on the inner wall of the equipment.

[0022] The flash structure 1 and the reflux pipe 3 are connected through the second flange 10, the lower half is designed as a U-shaped pipe, and the lowest point of the U-shaped pipe needs to be lower than the water supply opening 14 of the synthetic furnace by 0.3 m. This is because the steam condensate reflux pipe 3 of the flash structure 1 directly returns to the upper part of the combustion section 13 of the synthetic structure 2 close to the steam section 12, which is about 3 m higher than the water supply opening 14 of the synthetic furnace. Therefore, from the wet steam to the bottom of the U-shaped pipe, a total of about 3.3 m, effectively prevents the condensate pipe from leaking into the wet steam of about 0.33 MPa, avoids the mixing of condensate and steam, and forms bubbles in the reflux pipe 3 or the flash structure 1. The bubbles break in the reflux pipe 3 or the flash structure 1, causing corrosion and cavitation of the reflux pipe 3 or the flash structure 1, affecting the safe operation of the flash structure 1.

[0023] The DN150 flow limiting orifice plate 9 is connected on the rising pipe 4 through the flange to connect the second section and the first section. Through the flow limiting orifice plate 9, a controllable pressure difference (30kPa±20kPa) is established between the first section and the second section. The pressure originally concentrated in the first section of the rising pipe 4 is transferred to the flow limiting orifice plate 9, so that the fluid completes the preliminary pressure reduction before entering the flash structure 1. The flow limiting orifice plate 9 can also play a throttling effect to reduce the flow velocity of the fluid and inhibit the turbulent energy of the mixed flow of steam and liquid droplets in the rising pipe 4. The pressure difference is not greater than 50kPa, which can avoid the local flow velocity exceeding the critical cavitation index and eliminate the microjet impact caused by the collapse of the air bubble.

[0024] Specific implementation principle: first, the flow rate of wet steam is very large, which directly hits the inner wall of the flash structure 1, which will cause continuous erosion of the inner wall, causing the inner wall of the flash structure 1 to be locally thinned, and then affecting the service life of the flash structure 1, therefore, the downward 45° elbow pipe 6 is arranged on the riser 4, and DN150 flow limiting orifice plate 9 and DN250 pipe are used instead of the original DN200 pipe, which is to reduce the flow rate and pressure of the wet steam, and reduce the impact and corrosion of the wet steam on the inner wall of the flash structure 1. Secondly, in the production and operation process of the synthesis structure 2, the steam condensate in the reflux pipe 3 of the flash structure 1 is mixed with the steam, and bubbles are formed in the reflux pipe 3 or the flash structure 1, the bubbles break in the reflux pipe 3 or the flash structure 1, causing corrosion and cavitation of the reflux pipe 3 or the flash structure 1, affecting the safe operation of the flash structure 1, therefore, the U-shaped pipe is arranged, the lowest point of the U-shaped pipe needs to be lower than the water supply port 14 of the synthesis furnace by 0.3m, from the wet steam to the bottom of the U-shaped pipe, about 3.3m, effectively preventing the condensate from leaking into the wet steam of about 0.33MPa, that is, avoiding the mixing of steam condensate and steam. In order to reduce the corrosion and vibration of the first section (ascending section) of the riser 4, the flow limiting orifice plate 9 of DN150 is arranged to adjust the pressure difference between the riser 4 and the flash structure 1, so that the steam is flashed in the flash structure 1, avoiding the local flow rate exceeding the critical cavitation index, eliminating the microjet impact caused by the collapse of the air bubble. In addition, the flange of the present application can reduce the number of unplanned shutdown maintenance of the synthesis furnace, making the maintenance and replacement more convenient.

[0025] The above are preferred embodiments of the present application, and are not limited to the scope of the application, therefore: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the scope of the present application.

Claims

1. A novel corrosion-resistant device for the steam system of a by-product steam graphite synthesis furnace, characterized in that, It includes a flash structure (1) and a synthesis structure (2). The flash structure (1) is connected to the synthesis structure (2) through a riser pipe (4) and a return pipe (3). The riser pipe (4) is provided with a first flange (7) on the outside and a bend pipe (6) on the inside. The lower half of the return pipe (3) is a U-shaped pipe.

2. The corrosion-resistant device for the steam system of the novel by-product steam graphite synthesis furnace according to claim 1, characterized in that, The riser pipe (4) is a DN250 pipe, which is connected to the upper half of the side of the flash structure (1) through the first flange (7), and the other end is connected to the steam section (12) on the synthesis structure (2). The steam section (12) is located in the middle of the synthesis structure (2). The return pipe (3) is connected to the lower half of the side of the flash structure (1) through the second flange (10), and the other end is connected to the upper half of the side of the combustion section (13) of the synthesis structure (2). The combustion section (13) is located in the lower half of the synthesis structure (2).

3. The corrosion-resistant device for the steam system of the novel by-product steam graphite synthesis furnace according to claim 1, characterized in that, The bend (6) is a downward 45° bend.

4. The corrosion-resistant device for the steam system of the novel by-product steam graphite synthesis furnace according to claim 2, characterized in that, A water inlet (14) is provided 3m below the intersection of the return pipe (3) and the combustion section (13), and the lowest point of the U-shaped pipe on the return pipe (3) is 0.3m below the water inlet (14).

5. The corrosion-resistant device for the steam system of the novel by-product steam graphite synthesis furnace according to claim 1, characterized in that, The riser pipe (4) and the first flange (7) are connected by a flange to a flow-limiting orifice plate (9).

6. The corrosion-resistant device for the steam system of the novel by-product steam graphite synthesis furnace according to claim 5, characterized in that, The flow-limiting orifice plate (9) is DN150.

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