JP6393438B1 - Method of spraying irregular refractories for coke oven carbonization chamber and spraying material used therefor - Google Patents

Abstract

[PROBLEMS] To provide a water injection device in a material conveyance pipe from a material supply machine to a tip spray nozzle, and to inject the construction water into the spray material conveyed in the material conveyance pipe from this water injection machine, for an irregular fireproofing for a coke oven carbonization chamber. In the method of spraying objects, the stability of the spraying work is improved and the workability of the leveling work is improved. A coke oven carbonization is provided in which a water injector 7 is provided in a material transport pipe 5 extending from a material supply machine 1 to a tip spray nozzle 4 and construction water is poured into the spray material transported from the water feeder into the material transport pipe. In the method of spraying room-specific refractories, the flow rate (Nm3 / min) of the construction water transport gas for transporting the construction water introduced into the water injector 7 and the spray for transporting the spray material. The ratio (flow rate of construction water transfer gas / flow rate of spray material transfer gas) to 0.07 to 2 with the flow rate of the transfer material transfer gas (Nm3 / min), and the compressibility of the spray material Between 15% and 32%. [Selection] Figure 1

Description

  The present invention relates to a method for spraying an irregular refractory for a coke oven carbonization chamber, and a spray material used therefor.

First, a general spraying method for an irregular refractory will be described. The spraying method can be roughly classified into a wet method and a dry method.
The wet construction method is a construction method in which construction water is added to a material in advance and kneaded to form a slurry-like spraying material, and a quick setting agent or the like is added and sprayed at a tip spray nozzle portion. On the other hand, the dry construction method is a construction method in which the spray material is transported by gas in a dry state, and the construction water is injected and sprayed at the tip spray nozzle portion.

  The wet construction method is capable of forming a dense refractory spray construction body having better adhesion than the dry construction method, and has the effect of reducing the amount of dust generated during construction. On the other hand, a kneading device and a slurry pumping device are required for spraying, and the structure of the device is complicated and expensive, and after spraying, slurry-like spraying material adheres to the kneading device and the conveyance hose. However, there is a drawback that it takes time for the cleaning operation.

  On the other hand, in the dry construction method, the spraying device is basically simple and workable because the construction water is simply injected into the spraying material that has been transported in a dry state by the tip spray nozzle. Although the spraying is performed in a state where water (construction water) is not sufficiently mixed with the spray material, a lot of dust is generated during spraying, and the refractory structure of the sprayed body is uneven. The adhesion rate, adhesive strength and corrosion resistance are also inferior. Compared with the wet construction method, there is also a drawback that it is difficult to obtain a dense spray construction body because the kneading effect is low and the amount of construction water is large.

Therefore, as an improvement of the dry construction method, two water injectors are provided in the material transport pipe from the material supply machine to the tip spray nozzle, and spraying that sprays atomized water with an average of 100 μm or less together with compressed air from each water injector A construction method is known (see, for example, Patent Document 1).
However, when the present inventors carried out a lot of spraying construction by this spraying construction method, the discharge amount of the spraying material fluctuates or a phenomenon that the spraying material and the construction water are separated is occasionally seen. It was found that there was room for improvement in the stability of spray construction.

  On the other hand, in the spraying construction of the irregular refractory to the damaged part of the coke oven carbonization chamber, one person sprays and the other person performs the leveling work to smooth the spray material. For this reason, in the method of spraying an irregular refractory for a coke oven carbonization chamber, it is also required that the sprayed spray material is even.

Japanese Patent No. 4377913

  The problem to be solved by the present invention is to provide a water injection device in a material conveyance pipe from the material supply machine to the tip spray nozzle, and to inject the construction water into the spraying material conveyed in the material conveyance pipe from this water injection device In the method of spraying an amorphous refractory for a furnace carbonization chamber, it is to improve the stability of the spraying work and improve the workability of the leveling work.

The inventors of the present invention first conducted a test of a water injector when it was considered important to improve the water mixing of the construction water with respect to the spray material and the transportability of the spray material in order to improve the stability of the spray construction. flow construction water carrier gas for transporting the construction water introduced into the (Nm 3 / ^min), the spraying material conveying gas for conveying the spraying material flow (Nm 3 / ^min) and the It has been found that the ratio and the degree of compression of the spray material are important parameters for improving the above-mentioned water-mixing and transportability and thus improving the stability of the spraying construction. Furthermore, when tests were repeated from the viewpoint of improving the workability of the leveling work, it was found that the compressibility of the spray material was an important parameter from the viewpoint of improving the workability of the leveling work. The invention has been completed.

That is, according to one aspect of the present invention, the following spray construction method is provided.
Only one water injector is installed in the material transport pipe from the material feeder to the tip spray nozzle, and the spraying of the amorphous refractory for the coke oven carbonization chamber that injects water into the spray material transported through the material transport pipe from this water injector. It is an installation method,
The flow rate of the construction water carrier gas for transporting the construction water introduced into the water injector and (Nm 3 / ^min), the spraying material conveying gas for conveying the spraying material flow (Nm 3 ^/ min ) (Flow rate of construction water carrying gas / flow rate of blowing material carrying gas) is 0.07 or more and 2 or less, and the compressibility of the blowing material is 15% or more and 32% or less. , A method for spraying amorphous refractories for coke oven carbonization chambers.

  Moreover, according to the other viewpoint of this invention, it is a spraying material used for the spraying construction method of the amorphous refractory for coke oven carbonization chambers of this invention, Comprising: A compressibility is 15% or more and 32% or less. Spray material is provided.

  According to the present invention, at the time of spraying construction, the mixed water of the construction water with respect to the spraying material and the transportability of the spraying material are improved, and as a result, the stability of the spraying construction is improved. Further, according to the present invention, the workability of leveling work is also improved.

The conceptual diagram which shows an example of the spraying apparatus for enforcing the spraying construction method of this invention. The conceptual sectional drawing of the chamotte brick made into the spray object by an Example and a comparative example.

  First, an example of the spray apparatus for implementing the spray construction method of this invention is demonstrated, referring FIG.

  In FIG. 1, reference numeral 1 denotes a material supply machine in which a spray material 2 is stored. As long as the material supply machine 1 is generally used in spraying devices for irregular refractories and can discharge a fixed amount, any type of material such as a protector gun, a lead gun, or a field cement gun can be used without any problem. it can.

  The spray material 2 in the material supply machine 1 is supplied with a material by a table feeder 3 that is driven by a motor M provided at the lower end, the internal pressure of which is adjusted by a gas such as compressed air supplied into the material supply machine 1. It is supplied to the material conveying pipe 5 from the machine 1 to the tip spray nozzle 4.

  The material conveying pipe 5 is supplied with the blowing material conveying gas through the blowing material conveying gas introduction pipe 6 of the table feeder 3, and the blowing material 2 from the material supply machine 1 is supplied to the tip of the material conveying pipe 5. 4 is sprayed onto the coke oven carbonization chamber A.

  The material transport pipe 5 is provided with only one water injector 7 in the vicinity of the tip spray nozzle 4. The spraying work in the coke oven is mainly performed manually by the operator holding the tip spray nozzle 4, so the structure in the vicinity of the tip spray nozzle 4 needs to be simple and lightweight. For this reason, the number of water injectors is limited to one.

From the water injector 7, the construction water is supplied together with the construction water transport gas to the spray material 2 transported through the material transport pipe 5. The configuration of the water injector 7 is not particularly limited as long as the construction water can be supplied (poured) into the material conveyance pipe 5 together with the construction water conveyance gas. Since the construction water is poured from the water injector 7 together with the construction water conveying gas, the construction water becomes so-called spray water (atomized water).
The position where the water injector 7 is provided is preferably in the range of 0.5 m or more and less than 5 m from the tip of the tip spray nozzle 4, more preferably 0.5 m or more and less than 3 m. The length of the tip spray nozzle 4 is approximately 1 m or more and 10 m or less.

  The spray material conveying gas and the construction water conveying gas used in the present invention are typically air (compressed air), but other gases such as nitrogen (compressed nitrogen) can also be used. Moreover, the pressure of the gas to be used can be made into the range of about 0.2 MPa or more and 0.5 MPa or less.

Next, the spraying construction method of the present invention will be described by using the spraying device of FIG.
The first feature of the spray construction method of the present invention is that the flow rate (Nm ³ / min) of the construction water transport gas for transporting the construction water introduced into the water injector 7 and the spray material are transported. The ratio of the flow rate of the spray material conveying gas (Nm ³ / min) (the flow rate of the construction water transfer gas / the flow rate of the spray material transfer gas) (hereinafter referred to as the “transport gas flow ratio”) is 0. 0.07 or more and 2 or less. By making this conveyance gas flow rate ratio 0.07 or more and 2 or less, the mixing water of construction water and the transportability of the spraying material are improved, and the stability of the spraying construction is improved.
On the other hand, if the transport gas flow ratio is less than 0.07, the flow rate of the spray material transport gas is large, so the construction water does not reach the center of the material transport pipe 5 that transports the spray material, Water mixing becomes worse.
On the other hand, if the transfer gas flow ratio exceeds 2, the flow rate of the construction water transfer gas is large, so that a turbulent flow occurs with the spray material transfer gas, and as a result, spraying in the vicinity of the water injector 7 The adhesion of the material and, further, the adhesion of the spray material also occurs on the material transport pipe 5 on the upstream side thereof, and the transportability of the spray material is deteriorated.
The transfer gas flow ratio is preferably 0.1 or more and 1 or less.

The second feature of the spray construction method of the present invention is that a material having a degree of compression of 15% to 32% is used as the spray material. In other words, a spray material whose particle size configuration is adjusted so that the degree of compression is 15% or more and 32% or less is used. Here, the degree of compression is obtained by the following equation.
Compressibility (%) = (Densely packed bulk density−Roughly packed bulk density) / Densely packed bulk density × 100
In addition, although mentioned later for details, the spraying material used by this invention may contain a fiber in addition to a refractory raw material powder, When a fiber is contained, evaluation of a compressibility (dense filling bulk density and loose filling) The measurement of the bulk density is carried out in a state where the fibers are removed. That is, when a spray material contains a fiber, the compression degree said by this invention means what evaluated about the spray material except a fiber.

When construction water is added to the spray material, the powder in contact with the construction water tends to become a slurry and become highly viscous. Since it contains, it is easy to aggregate by the external force etc. of the gas for construction water conveyance. Furthermore, since the partial slurry viscosity increases due to the addition of the construction water, the agglomeration is further accelerated and the construction water is not uniformly moistened, resulting in a decrease in water mixing. When aggregation is remarkable, spray material adheres in the material conveyance pipe | tube 5, becomes a cause of obstruction | occlusion, and causes a fall of conveyance property.
On the other hand, if the degree of compression of the spray material is less than 15%, the sprayed spray material is too low in viscosity (smooth), so it becomes easy to peel off from the coke oven carbonization chamber during the leveling operation. As a result, workability of the leveling work is reduced.
The degree of compression is preferably 18% or more and 25% or less.

In the spray construction method of the present invention, the ratio of the flow rate (Nm ³ / min) of the construction water carrying gas to the construction water volume (m ³ / min) (the flow rate of the construction water carrying gas / the construction water volume) (hereinafter “gas” -It is preferable to set it as 100 or more and 1000 or less. By setting the gas / construction water amount ratio to 100 or more and 1000 or less, the water content of the construction water, the transportability of the spray material, and the stability of the spray construction are improved. The gas / construction water amount ratio is more preferably 250 or more and 800 or less.

In the spray construction method of the present invention, the ratio of the discharge amount of spray material (kg / min) to the total flow rate of transport gas (Nm ³ / min) (discharge amount of spray material / total flow rate of transport gas) ) (Hereinafter referred to as “solid-gas ratio”) is preferably 1 or more and 20 or less. By setting this solid-gas ratio to 1 or more and 20 or less, the mixed water of the construction water, the transportability of the spray material, and the stability of the spray construction are improved.
Note that "total flow rate of carrier gas (Nm 3 / ^min)" used in this solid-gas ratio calculation, the spraying material conveying gas from spraying material carrier gas introduction pipe 6 a flow rate (Nm ³ / and min), refers to the flow rate of the construction water conveying gas from the water injector 7 ^(Nm 3 / min) total flow rate of ^(Nm 3 / min).

The particle size composition of the spray material used in the spray construction method of the present invention is that the content of particles having a particle size of more than 0.5 mm and not more than 4 mm is 20% by mass to 50% by mass, and the content of particles having a particle size of 45 μm or less. Is preferably not less than 10% by mass and not more than 40% by mass, in order to improve the workability of the leveling operation and to improve the filling property of the spray material. That is, since crack-like damage (microcracks) may exist at the damaged portion of the coke oven carbonization chamber, the ease of filling the spray material into the microcracks is also required.
When the content of particles having a particle diameter of 45 μm or less exceeds 40% by mass, the viscosity of the sprayed material becomes high and the work load during the leveling work increases. On the other hand, when the content of particles having a particle size of 45 μm or less is less than 10% by mass, it becomes difficult to fill the microcracks (width of several millimeters) with the spray material during the leveling operation.
On the other hand, when the content of particles having a particle size of more than 0.5 mm and less than 4 mm exceeds 50% by mass, the viscosity is lowered and the coke oven is easily peeled off from the coke oven carbonization chamber during the leveling operation. On the other hand, when the content of particles having a particle size of more than 0.5 mm and less than 4 mm is less than 20% by mass, the viscosity increases and the work load during the leveling operation increases.
In addition, this particle size structure is preferable also from the point which is easy to make the compressibility of a spraying material into 15% or more and 32% or less.
Here, in the present invention, the particle diameter of the particles exceeding d means that the particles remain on the sieve having an opening d, and the particle diameter of not more than d means that the particles are eyes. It means a particle size that passes through a sieve having an opening d.

  The spraying material used in the spraying construction method of the present invention can be appropriately mixed and mixed with additives such as a binder, a dispersing agent and a quick setting agent in addition to the refractory powder. A fiber can also be contained with an agent.

  The refractory powder can be used without any problem as long as it is a refractory powder generally used for an amorphous refractory for a coke oven carbonization chamber, and specifically includes siliceous and alumina-silica. It is done.

  Examples of the binder include slaked lime, alumina cement, magnesia cement, phosphate, silicate, and the like, and one or more of these can be used in combination.

  The dispersant is also called a peptizer and has the effect of imparting the fluidity of the spray material. As this dispersant, any dispersant used in general amorphous refractories can be used without any problem. Specific examples include sodium tripolyphosphate, sodium hexametaphosphate, sodium ultrapolyphosphate, sodium acid hexametaphosphate, sodium borate, sodium carbonate, polymetaphosphate, silicate, phosphate and other inorganic salts, sodium citrate, Examples thereof include sodium tartrate, sodium polyacrylate, sodium sulfonate, polycarboxylate, β-naphthalenesulfonate, naphthalene sulfonic acid, carboxyl group-containing polyether dispersant, and the like.

The rapid setting agent reacts with the binder in the presence of construction water to rapidly cure the spray material and impart adhesion to the spray material. The quick setting agent may be mixed in the spray material from the beginning in a powder state, or the quick setting agent may be added from the tip spray nozzle 4 or the water injector 7. When the quick setting agent is added from the tip spray nozzle 4 or the water injector 7, the quick setting agent is used in a liquid form diluted with water as necessary.
Specific examples of the quick setting agent include silicates such as sodium silicate and potassium silicate, aluminates such as sodium aluminate, potassium aluminate and calcium aluminate, sodium carbonate, potassium carbonate and sodium hydrogen carbonate. carbonates, sodium sulfate, potassium sulfate, sulfates such as magnesium _{sulfate, CaO · Al 2 O 3,} 12CaO · 7Al 2 O 3, CaO · 2Al 2 O 3, 3CaO · Al 2 O 3, 3CaO · 3Al 2 O Calcium aluminates such as ₃ · CaF ₂ , 11CaO · 7Al ₂ O ₃ · CaF ₂ , calcium salts such as calcium oxide, calcium hydroxide, and calcium chloride.

  As the fiber, a fiber that is an ordinary amorphous refractory and used for the purpose of preventing explosion or the like can be used, and examples thereof include vinylon, nylon, PVA, polyvinyl, polystyrene, polypropylene, and carbon.

Table 1 shows examples and comparative examples of the present invention.
The spray material is a mixture of alumina-siliceous powder as a refractory powder, slaked lime as a binder, and silicate as a dispersant in a predetermined ratio. The chamoten brick was imitated to the damaged part of the coke oven carbonization chamber. At the time of spraying construction, the chamotte bricks to be sprayed were preheated to 500 ° C.
As evaluation, while evaluating water-mixing and conveyance at the time of spray construction, the workability of leveling work and the filling property of spray material were evaluated, and comprehensive evaluation was performed based on these evaluation results.
Note that the pressures of the transfer gas and the spray material transfer gas were in the range of 0.2 MPa to 0.5 MPa.

  The mixed water was evaluated by visually observing the state of spraying from the tip spray nozzle 4 and by the degree of separation between the construction water and the spray material. The smaller the degree of separation, the better the water mixing. Specifically, the case where there was no separation was evaluated as ◯ (excellent), the case where separation was small was evaluated as Δ (good), and the case where separation was large was evaluated as x (defective).

  The transportability was evaluated by visually observing the state of spraying from the tip spray nozzle 4 and by the degree of variation in the discharge amount of the spray material. The smaller the variation in the discharge amount, the better the transportability. Specifically, the case where there was no change in the discharge amount was indicated as ◯ (excellent), the case where there was a slight change in the discharge amount, Δ (good), and the case where the change in the discharge amount was large was indicated as x (defect).

  The workability of the leveling work was evaluated by the leveling ease during the leveling work. Specifically, ○ (excellent) when resistance can be easily leveled with little resistance during leveling work, △ (good) when resistance is slightly large but can be leveled, and resistance is greatly leveled. The case where it was difficult was set as x (defect).

  The filling property of the spray material was evaluated by cutting the chamotte bricks to be sprayed as shown in FIG. 2 after the leveling work and by filling the damaged area on the cut surface with the spray material. Specifically, the case where the filling area ratio is 80% or more is ◯ (excellent), the case where the filling area ratio is 60% or more and less than 80% is Δ (good), and the case where the filling area ratio is less than 60% is × ( Bad).

  Comprehensive evaluation, in each of the above evaluations, if all are ○ (excellent), ○ (excellent), if there is a △ (good), and if there is no × (bad), either △ (good) The case where there was a x (defect) was defined as x (defect).

表１の実施例１〜１４はいずれも、搬送用ガス流量比が０．０７以上２以下、かつ吹付け材料の圧縮度が１５％以上３２％以下と本発明の範囲内にあり、各評価において×（不良）の評価はなく良好であり、総合評価も良好であった。

Each of Examples 1 to 14 in Table 1 is within the scope of the present invention, with the transfer gas flow rate ratio being 0.07 or more and 2 or less, and the compressibility of the spray material being 15% or more and 32% or less. In the evaluation, x (defect) was not good, and the overall evaluation was good.

  On the other hand, Comparative Example 1 is an example in which the compressibility of the spray material is as small as 10%. The workability of the leveling work was poor and the filling property was also bad.

DESCRIPTION OF SYMBOLS 1 Material supply machine 2 Spraying material 3 Table feeder 4 Tip spray nozzle 5 Material conveyance pipe 6 Gas introduction pipe for spraying material conveyance 7 Water injection device A Coke oven carbonization chamber

Claims (6)

Only one water injector is installed in the material transport pipe from the material feeder to the tip spray nozzle, and the spraying of the amorphous refractory for the coke oven carbonization chamber that injects water into the spray material transported through the material transport pipe from this water injector. It is an installation method,
The flow rate of the construction water carrier gas for transporting the construction water introduced into the water injector and (Nm 3 / ^min), the spraying material conveying gas for conveying the spraying material flow (Nm 3 ^/ min ) (Flow rate of construction water carrying gas / flow rate of blowing material carrying gas) is 0.07 or more and 2 or less, and the compressibility of the blowing material is 15% or more and 32% or less. , A method for spraying amorphous refractories for coke oven carbonization chambers. The ratio of the flow rate (Nm ³ / min) of the construction water carrying gas to the construction water amount (m ³ / min) (flow rate of construction water carrying gas / construction water amount) is 100 or more and 1000 or less. A method for spraying an amorphous refractory for a coke oven carbonization chamber as described. The ratio (discharge amount of spray material / total flow of transport gas) of the discharge amount of spray material (kg / min) and the total flow rate of transport gas (Nm ³ / min) is 1 or more and 20 or less. A method for spraying an amorphous refractory for a coke oven carbonization chamber according to claim 1 or 2.   The content of particles having a particle size of more than 0.5 mm and 4 mm or less in the spray material is 20% by mass or more and 50% by mass or less, and the content of particles having a particle size of 45 μm or less is 10% by mass or more and 40% by mass or less. A method for spraying an irregular refractory for a coke oven carbonization chamber according to any one of claims 1 to 3.   It is a spraying material used for the spray construction method of the amorphous refractory for coke oven carbonization chambers in any one of Claim 1 to 4, Comprising: The spraying material whose compression degree is 15% or more and 32% or less .   The content of particles having a particle size of more than 0.5 mm and 4 mm or less is 20% by mass or more and 50% by mass or less, and the content of particles having a particle size of 45 μm or less is 10% by mass or more and 40% by mass or less. The spraying material described.

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