A method for repairing cracks in a hydrogen chloride synthesis furnace cooler

Abstract

The application discloses a hydrogen chloride synthesis furnace cooler crack repairing method. The hydrogen chloride synthesis furnace cooler crack repairing method comprises the following steps: grinding a bevel at a position of a graphite inner cylinder with a crack; and pressing a graphite ring at the bevel after applying graphite adhesive to the bevel, the bottom and the outer side of the graphite ring, and then naturally air-drying. The hydrogen chloride synthesis furnace cooler crack repairing method is simple, fast and firm.

Description

TECHNICAL FIELD

[0001] The present application relates to a hydrogen chloride synthesis furnace cooler crack repair method. BACKGROUND

[0002] The hydrogen chloride synthesis furnace inner cylinder of a chlor-alkali plant is made of graphite material, and the cooler material is also graphite. Since the top cooler of the synthesis furnace and the connecting part of the cylinder cannot be processed in one time, they are in the form of bonding. After long time operation or long time pressure test, water leakage phenomenon occurs. If the graphite inner cylinder bonding part leaks, water leaks to the combustion section, which can cause the synthesis furnace lamp to burst, and more leakage can cause the synthesis furnace cylinder to be damaged, which seriously affects the operation of the entire chlor-alkali system.

[0003] The hydrogen chloride synthesis furnace is composed of a graphite inner cylinder and a steel outer wall. During the reaction, cooling water is circulated between the reaction cylinder and the outer wall to absorb the residual heat. Cylinder leakage can cause serious operation accidents, and even equipment accidents. The early graphite inner cylinder of the synthesis furnace always has a standby inner cylinder, which is replaced after the on-line running equipment is damaged. However, the graphite cylinder is expensive, and the temperature difference between seasons is large. The standby cylinder will also fall off at the bonding part in the natural state, resulting in incomplete standby, so an effective graphite bonding technology is needed to replace the stagnant standby repair method.

[0004] At present, when the early graphite cooler bonding gap leaks, the gap smearing method is used, that is, graphite powder, adhesive and curing agent are mixed in a certain proportion and uniformly, and then uniformly applied to the leakage part of the graphite cooler. After the first layer is dried, the second and third layers are continuously applied, and water is tested for leakage. If there is leakage, continue to apply upwards until there is no leakage. However, the following disadvantages exist:

[0005] (1) Time-consuming and labor-intensive, each layer of graphite adhesive needs a certain time to cure, and the waiting time is long, which not only affects the repair time, but also prolongs the normal operation time.

[0006] (2) Poor strength, graphite adhesive is mainly composed of graphite powder, adhesive and curing agent, which is hard and brittle. Although the number of applied layers is large, the thickness is small, and the strength is poor.

[0007] (3) Poor timeliness, since the graphite adhesive is only bonded to the surface of the crack, the adhesive does not penetrate into the crack, and the cured adhesive cannot withstand long time operation. Generally, leakage occurs again after about 3 months.

[0008] Therefore, the present application provides a new hydrogen chloride synthesis furnace cooler crack repair method, which is firm and can be used for a long time. SUMMARY

[0009] The application aims to provide a hydrogen chloride synthesis furnace cooler crack repairing method, which has fast repairing speed and achieves firm repairing effect.

[0010] In order to achieve the above-mentioned purpose, the technical scheme adopted is:

[0011] A hydrogen chloride synthesis furnace cooler crack repairing method comprises the following steps:

[0012] Grinding a bevel at a position with cracks in the graphite inner cylinder;

[0013] After applying graphite adhesive to the bevel and the bottom and outer side of the graphite ring, pressing the graphite ring at the bevel, and naturally air-drying.

[0014] Further, the width of the bevel is between 1 / 4 and 1 / 3 of the wall thickness of the graphite inner cylinder, and the depth is 1 / 4 of the wall thickness of the graphite inner cylinder.

[0015] Further, the outer diameter of the graphite ring is smaller than the inner diameter of the graphite inner cylinder.

[0016] Further, the cross section of the graphite ring is square, and the wall thickness is 1 / 2 of the wall thickness of the graphite inner cylinder.

[0017] Further, the graphite adhesive comprises a cementing agent, a filler, a stabilizer and a curing agent.

[0018] Further, the graphite adhesive comprises phenolic resin, graphite powder, benzyl alcohol and benzenesulfonyl chloride.

[0019] Further, the volume ratio of the phenolic resin, graphite powder, benzyl alcohol and benzenesulfonyl chloride is 18-22:22-28:1:1.5-2.5.

[0020] Further, the volume ratio of the phenolic resin, graphite powder, benzyl alcohol and benzenesulfonyl chloride is 20:25:1:2.

[0021] Compared with the prior art, the application has the following beneficial effects:

[0022] 1. The technical scheme of the application effectively solves the problem of unfirm graphite bonding by using the adhesive containing phenolic resin, graphite powder, benzyl alcohol and benzenesulfonyl chloride.

[0023] 2. The technical scheme of the application uses the graphite ring for bonding, which is simple in steps and saves the time for layer-by-layer coating and waiting for curing (1 day for completion).

[0024] 3. The technical scheme of the application strengthens the strength of bonded graphite by bonding the graphite ring at the position with cracks.

[0025] 4. The technical scheme of the present application saves cost and solves the problem of long-term standby of a set of graphite inner cylinder (about 100,000 yuan).

[0026] 5. The technical scheme of the present application shortens the time from shutdown maintenance to start-up. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic view of a graphite ring;

[0028] Figures 2-4 is a schematic view of a graphite ring adhered to the inside of a graphite inner cylinder, Figures 3-4 The circle indicates adhesion to the inside of the graphite inner cylinder. DETAILED DESCRIPTION

[0029] In order to further illustrate the present application, a hydrogen chloride synthesis furnace cooler crack repair method, to achieve the intended purpose of the application, the following preferred embodiments, according to the present application, a hydrogen chloride synthesis furnace cooler crack repair method, its specific implementation, structure, features and effects, as follows. In the following description, different "an embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics of one or more embodiments can be combined in any suitable form.

[0030] The present application will be further described in detail below with specific embodiments:

[0031] The technical scheme of the present application is:

[0032] A hydrogen chloride synthesis furnace cooler crack repair method, comprising the following steps:

[0033] Grind the bevel at the position of the crack in the graphite inner cylinder;

[0034] After applying graphite adhesive to the bevel and the bottom and outer side of the graphite ring, press the graphite ring at the bevel, and then air dry naturally.

[0035] Preferably, the width of the bevel is between 1 / 4 and 1 / 3 of the wall thickness of the graphite inner cylinder, and the depth is 1 / 4 of the wall thickness of the graphite inner cylinder.

[0036] Preferably, the outer diameter of the graphite ring is smaller than the inner diameter of the graphite inner cylinder.

[0037] Further preferably, the cross section of the graphite ring is square, and the thickness and width of the graphite ring are 1 / 2 of the wall thickness of the graphite inner cylinder.

[0038] Further preferably, the graphite adhesive comprises a cementing agent, a filler, a stabilizer and a curing agent.

[0039] Further preferably, the graphite adhesive comprises phenolic resin, graphite powder, benzyl alcohol, benzene sulfonyl chloride.

[0040] By adding a certain amount of stabilizer, the reaction after bonding is slowed down, the chemical balance is maintained, and the structure is stable.

[0041] Further preferably, the volume ratio of the phenolic resin, graphite powder, benzyl alcohol and benzene sulfonyl chloride is 18-22:22-28:1:1.5-2.5.

[0042] Further preferably, the volume ratio of the phenolic resin, graphite powder, benzyl alcohol and benzene sulfonyl chloride is 20:25:1:2.

[0043] By the ratio, the adhesive effect is good, and the solidification is ensured after the bonding operation.

[0044] The technical scheme of the present application improves the curing agent, bonds the graphite ring at the cracked place, solves the problem that the graphite adhesive in the prior art only stays on the surface of the crack and is limited by the thickness of the graphite adhesive, increases the strength, and prolongs the service life.

[0045] Example 1.

[0046] Combining Figures 1-4 , the specific operation steps are as follows:

[0047] (1) A groove with a width less than 1 / 3 of the wall thickness, greater than 1 / 4 of the wall thickness, and a depth of about 1 / 4 of the wall thickness is opened in the graphite inner cylinder using a metal spiral file or an air grinder pen, and the cylinder thickness is paid attention to to prevent the groove from being opened through.

[0048] (2) As shown in Figure 1 , a graphite ring (diameter small 1mm) with a square cross section and a wall thickness of 1 / 2 of the wall thickness of the graphite inner cylinder is prefabricated, and the outer diameter is slightly smaller than the inner diameter of the part to be repaired.

[0049] (3) As shown in Figures 2-4 , after the inside of the groove is coated with graphite adhesive, the graphite adhesive is uniformly coated on the outside and the lower side of the graphite ring, and is gently pressed on the corner joint to be repaired, and is naturally air-dried.

[0050] The graphite adhesive is uniformly coated in the groove opened in the part to be repaired, and the graphite adhesive must be fully coated in the groove to prevent voids.

[0051] The graphite adhesive uses phenolic resin as a cementing agent, artificial graphite powder as a filler, benzyl alcohol as a stabilizer, and benzene sulfonyl chloride as a curing agent. The volume ratio of the phenolic resin, graphite powder, benzyl alcohol and benzene sulfonyl chloride is 20:25:1:2.

[0052] The hydrogen chloride synthesis furnace cooler of the C set in the chlor-alkali plant of the company has been stably running for 8 months without leakage after being repaired by the method, while the leakage occurs in the prior art generally after about 3 months.

[0053] Example 2.

[0054] The specific operation steps are the same as those of Example 1, except that the volume ratio of phenolic resin, graphite powder, benzyl alcohol and benzene sulfonyl chloride is 18:22:1:1.5.

[0055] Example 3.

[0056] The specific operation steps are the same as those of Example 1, except that the volume ratio of phenolic resin, graphite powder, benzyl alcohol and benzene sulfonyl chloride is 22:28:1:2.5.

[0057] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification of the above embodiment according to the technical essence of the present application still belongs to the scope of the technical scheme of the present application.

Claims

1. A method for repairing cracks in the cooler of a hydrogen chloride synthesis furnace, characterized in that, Includes the following steps: Grind the beveled edges at the cracked areas inside the graphite inner cylinder; After applying graphite adhesive to the bevel and the bottom and outer side of the graphite ring, press the graphite ring onto the bevel and let it air dry naturally. The width of the bevel is between 1 / 4 and 1 / 3 of the thickness of the graphite inner cylinder wall, and the depth is 1 / 4 of the thickness of the graphite inner cylinder wall. The outer diameter of the graphite ring is smaller than the inner diameter of the graphite inner cylinder.

2. The repair method according to claim 1, characterized in that, The graphite ring has a square cross-section and a wall thickness that is half the wall thickness of the graphite inner cylinder.

3. The repair method according to claim 1, characterized in that, The graphite adhesive includes a binder, filler, stabilizer, and curing agent.

4. The repair method according to claim 3, characterized in that, The graphite adhesive includes phenolic resin, graphite powder, benzyl alcohol, and benzenesulfonyl chloride.

5. The repair method according to claim 4, characterized in that, The volume ratio of the phenolic resin, graphite powder, benzyl alcohol, and benzenesulfonyl chloride is 18-22:22-28:1:1.5-2.

5.

6. The repair method according to claim 5, characterized in that, The volume ratio of the phenolic resin, graphite powder, benzyl alcohol, and benzenesulfonyl chloride is 20:25:1:2.

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