Unshaped refractory material for pouring coke oven bottom plate and coke oven bottom plate construction method

Abstract

The invention relates to an unshaped refractory material for pouring a coke oven bottom plate and a construction method of the coke oven bottom plate. The unshaped refractory material is prepared from a powder raw material, a binder and water, the coke oven bottom plate construction method comprises the following steps: 1) preparing a powder raw material; (2) preparation work before pouring; (3) preparing amorphous mortar; (4) pouring a bottom plate of the coke oven; (5) finishing work after pouring; according to the invention, the unshaped refractory material is adopted to replace a conventional coke oven bottoming brick, the unshaped refractory material can be used for rapidly laying a coke oven bottom plate in a pouring manner, the ceramic particles have good heat insulation performance, and the ceramic brick particles can be used as aggregates in mortar, so that the structural strength of the unshaped refractory material is improved; and by adding the binder, the maintenance time of the bottom plate pouring body can be greatly shortened, the construction cost is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coke oven masonry, in particular to an amorphous refractory material for casting a coke oven bottom plate and a coke oven bottom plate construction method. Background Art

[0002] Coke oven is an important equipment for coal coking. The coke oven body is mainly composed of the furnace top, combustion chamber, carbonization chamber, ramp area, heat storage chamber and furnace bottom. Conventional coke oven is built by layering refractory bricks. The coke oven bottom construction is the foundation of the entire coke oven and is of great significance to the overall stability of the coke oven.

[0003] Coke oven bottom bricks are usually made of insulating bricks and floating bead bricks laid in layers. As coke ovens develop towards larger and longer life, the number of holes in the carbonization chamber increases, and the height and length of the carbonization chamber increase. The overall refractory material consumption of the coke oven increases exponentially, and the pressure on the bottom of the oven also increases. The coke oven bottom bricks are required to achieve the corresponding strength while also taking into account the insulation performance. On the other hand, the substantial increase in the amount of bottom bricks used in large coke ovens has also led to an increase in labor, material and construction costs.

[0004] The invention adopts an amorphous refractory material to replace conventional coke oven bottom bricks, and provides a preparation method of the amorphous refractory material and a coke oven bottom construction method matched therewith, so as to realize the renewal of the coke oven bottom structure. Summary of the invention

[0005] The present invention provides an amorphous refractory material for casting a coke oven bottom plate and a coke oven bottom plate construction method. The amorphous refractory material is used to replace conventional coke oven bottom bricks. The amorphous refractory material can be used to quickly lay the coke oven bottom plate by casting. The ceramic particles themselves have good heat insulation performance, and the ceramic brick particles can be used as aggregate in the mortar, thereby improving the structural strength of the amorphous refractory material. By adding a binder, the curing time of the bottom plate casting body can be greatly shortened, thereby reducing the construction cost and improving the construction efficiency.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A monolithic refractory material for casting a coke oven bottom plate, the monolithic refractory material is composed of a powder raw material, a binder and water; wherein, by mass percentage, the powder raw material includes: 60% to 70% of graded ceramic particles, 30% to 40% of cement powder; the amount of the binder added is 1% to 3% of the powder raw material; the water addition ratio is: per 1m 3 100-150L of water is added to the powder raw material; the graded ceramic particles are composed of 40%-50% of ceramic particles with a particle size of 3mm≤<5mm and 50%-60% of ceramic particles with a particle size of 5mm≤≤8mm, calculated by mass percentage.

[0008] Furthermore, the cement powder is silicate cement powder.

[0009] Furthermore, the adhesive is composed of a binder, an inorganic salt dispersant and a water retaining agent. The binder is industrial dextrin, and by mass percentage, the industrial dextrin is ≥80%, the inorganic salt dispersant is ≤10%, and the balance is the water retaining agent.

[0010] A coke oven bottom plate construction method comprises the following steps:

[0011] 1) preparing powder raw materials;

[0012] Mixing ceramic particles with a particle size of 3 mm ≤ < 5 mm and ceramic particles with a particle size of 5 mm ≤ ≤ 8 mm, and mixing the uniformly mixed graded ceramic particles with cement powder to obtain a powder raw material for standby use;

[0013] 2) Preparation work before pouring;

[0014] Before pouring the coke oven floor, the area to be poured on the coke oven floor is divided into several pouring units, and expansion joint templates are placed at the expansion joints of the coke oven floor; then the holes on the coke oven floor, including the lowering holes and cleaning holes, are protected and covered, and finally a springboard for workers to walk on is laid between each pouring unit;

[0015] 3) Preparation of amorphous mortar;

[0016] Put the powder raw materials and binder into an industrial mixer, add water and stir into an amorphous mortar, the stirring time is ≥ 20 minutes;

[0017] 4) Casting of coke oven bottom plate;

[0018] The divided pouring units are poured one by one, and the pouring order is from the furnace area to the furnace end. After the pouring layer of each pouring unit reaches the set height, the next pouring unit is poured. After each pouring unit is poured, the workers immediately flatten and tidy up the amorphous mortar in the pouring unit to achieve the set flatness. After all pouring units are poured and leveled, the springboards are removed in turn, and pouring is carried out at the springboards while they are removed. The pouring height is the same as the pouring height of the pouring unit.

[0019] 5) Finishing work after pouring;

[0020] The coke oven bottom plate is cured after pouring, and the expansion joint template is removed immediately when the amorphous mortar loses fluidity; after the overall curing is completed, the height and flatness of the coke oven bottom plate are re-measured, and the parts that do not meet the design standard requirements are marked and then repaired manually.

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

[0022] Amorphous refractory materials are used to replace conventional coke oven bottom bricks. Amorphous refractory materials can be quickly laid on the coke oven bottom plate by pouring. The ceramic particles themselves have good thermal insulation properties, and the ceramic brick particles can be used as aggregate in the mortar, thereby improving the structural strength of the amorphous refractory materials. By adding a binder, the maintenance time of the bottom plate casting can be greatly shortened, reducing construction costs and improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a process flow chart of the coke oven bottom plate construction method of the present invention.

[0024] Figure 2 It is a top view of the coke oven bottom plate during construction of the present invention.

[0025] In the figure: 1. Casting unit 2. Hole 3. Springboard 4. Expansion joint formwork DETAILED DESCRIPTION

[0026] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings:

[0027] The present invention discloses an amorphous refractory material for casting a coke oven bottom plate. The amorphous refractory material is composed of a powder raw material, a binder and water. The powder raw material comprises, by mass percentage, 60% to 70% of graded ceramic particles and 30% to 40% of cement powder. The amount of the binder added is 1% to 3% of the powder raw material. The water addition ratio is: 3 100-150L of water is added to the powder raw material; the graded ceramic particles are composed of 40%-50% of ceramic particles with a particle size of 3mm≤<5mm and 50%-60% of ceramic particles with a particle size of 5mm≤≤8mm, calculated by mass percentage.

[0028] Furthermore, the cement powder is silicate cement powder.

[0029] Furthermore, the adhesive is composed of a binder, an inorganic salt dispersant and a water retaining agent. The binder is industrial dextrin, and by mass percentage, the industrial dextrin is ≥80%, the inorganic salt dispersant is ≤10%, and the balance is the water retaining agent.

[0030] like Figure 1 As shown, a coke oven bottom plate construction method according to the present invention comprises the following steps:

[0031] 1) preparing powder raw materials;

[0032] Mixing ceramic particles with a particle size of 3 mm ≤ < 5 mm and ceramic particles with a particle size of 5 mm ≤ ≤ 8 mm, and mixing the evenly mixed graded ceramic particles with cement powder to obtain a powder raw material for standby use;

[0033] 2) Preparation work before pouring;

[0034] like Figure 2 As shown, before pouring the coke oven floor, the area to be poured on the coke oven floor is divided into several pouring units 1, and an expansion joint template 4 is placed at the expansion joint of the coke oven floor; then the holes 2 on the coke oven floor including the lowering hole and the cleaning hole are protected and covered, and finally a springboard 3 for workers to walk on is laid between each pouring unit 1;

[0035] 5) Preparation of amorphous mortar;

[0036] Put the powder raw materials and binder into an industrial mixer, add water and stir into an amorphous mortar, the stirring time is ≥ 20 minutes;

[0037] 6) Casting of coke oven bottom plate;

[0038] The divided pouring units are poured one by one, and the pouring order is from the furnace area to the furnace end. After the pouring layer of each pouring unit reaches the set height, the next pouring unit is poured. After each pouring unit is poured, the workers immediately flatten and tidy up the amorphous mortar in the pouring unit to achieve the set flatness. After all pouring units are poured and leveled, the springboards are removed in turn, and pouring is carried out at the springboards while they are removed. The pouring height is the same as the pouring height of the pouring unit.

[0039] 5) Finishing work after pouring;

[0040] The coke oven bottom plate is cured after pouring, and the expansion joint template is removed immediately when the amorphous mortar loses fluidity; after the overall curing is completed, the height and flatness of the coke oven bottom plate are re-measured, and the parts that do not meet the design standard requirements are marked and then repaired manually.

[0041] In the present invention, the coke oven bottom plate is cast by amorphous refractory materials, the main raw materials of which are powder raw materials composed of graded ceramic particles and cement powder, and the proportion of graded ceramic particles and powder raw materials shall be adjusted according to the actual load-bearing capacity, floor area, construction site ambient temperature, etc. of the coke oven. For the production by the entrusted manufacturer, the mixing experiment shall be carried out in advance, and the instruction manual shall be issued, and the parameters such as stirring time, water addition amount, pH value and chlorine content of the added water shall be recorded in the instruction manual.

[0042] The amorphous refractory material described in the present invention needs to be prepared on the construction site. The prepared amorphous mortar is directly poured into the area where the coke oven bottom plate is located according to the divided pouring units by a pouring machine. For locations with downward adjustment holes, cleaning holes, lower nozzles and other holes, the holes need to be sealed or protected before pouring to prevent the amorphous mortar from flowing in during the pouring process.

[0043] Before pouring, the pouring units are divided according to the floor area of ​​the coke oven, and expansion joints are set between the pouring units to prevent the coke oven bottom plate from cracking due to its own expansion during the maintenance or baking process.

[0044] The pouring thickness of the coke oven bottom is determined after pressure resistance calculation based on the coke oven type, the number of holes in the coke oven carbonization chamber and the length of the carbonization chamber.

[0045] The following embodiments are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following embodiments.

[0046] [Example]

[0047] In this embodiment, the amorphous refractory material is composed of powder raw materials, a binder and water; wherein, by mass percentage, the powder raw materials include: 65% graded ceramic particles, 35% cement powder; the amount of the binder added is 2% of the powder raw materials; the water addition ratio is: per 1m 3 Add 120L of water to the powder raw material.

[0048] In this embodiment, the graded ceramic particles are composed of 45% of ceramic particles with a particle size of 3 mm ≤ < 5 mm and 55% of ceramic particles with a particle size of 5 mm ≤ 8 mm, calculated by mass percentage.

[0049] like Figure 1 As shown, in this embodiment, the construction process of the coke oven bottom plate is as follows:

[0050] The powder raw materials are premixed in the manufacturer in advance, and the premixed powder raw materials are delivered to the construction site together with the binder, and the manufacturer issues instructions for use.

[0051] In this embodiment, the cement powder is silicate cement powder, and the binder is composed of industrial dextrin (binding agent), inorganic salt dispersant and water retaining agent, and by mass percentage, the industrial dextrin is 82%, the inorganic salt dispersant is 9%, and the balance is water retaining agent.

[0052] Before pouring, according to the instructions, put the powder raw materials and binder into an industrial mixer, add water and stir into a mortar state. When adding water, add it several times during the stirring process; the stirring time is 25 minutes, and after stirring, an amorphous mortar is obtained.

[0053] Before pouring on site, it is also necessary to carry out a strength test on the amorphous mortar. It is required that after mixing, the amorphous mortar should be in a completely static state and its surface should solidify within 10 minutes and no longer be in a fluid state. If the above requirements are met, the pouring conditions are met.

[0054] like Figure 2As shown, while preparing the amorphous mortar, the on-site construction workers use templates to protect the holes 2 such as the lower adjustment holes, cleaning holes, and lower nozzle holes on the coke oven bottom plate, and reasonably set the expansion joint templates 4 according to the division of the casting unit 1 to prevent the coke oven bottom plate from cracking due to expansion after casting.

[0055] According to the divided pouring units, a springboard 3 for construction workers to walk on is set, and then each pouring unit is poured one by one according to the sequence arranged in advance by a pouring machine. In this embodiment, the pouring sequence is poured from the middle of the coke oven to both ends of the coke oven at the same time.

[0056] After the pouring layer reaches the thickness specified in the design, the pouring body is leveled manually, and then the height and flatness of the leveled part are checked until it meets the design requirements of the coke oven floor.

[0057] After the pouring work is completed, the springboard 3 is first removed in sequence, and the gaps at the springboard 3 are poured while being removed until the entire coke oven bottom plate is poured. Then the coke oven bottom plate is manually tested for flatness and height, and unqualified areas are locally supplemented with pouring and manually repaired.

[0058] Finally, carry out maintenance according to the design requirements. When the amorphous mortar after pouring does not have fluidity, quickly remove the expansion joint formwork to prevent it from affecting the expansion of the subsequent pouring body.

[0059] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An amorphous refractory material for casting a coke oven bottom plate, characterized in that: The monolithic refractory material is composed of powder raw materials, binder and water; wherein, by mass percentage, the powder raw materials include: graded ceramic particles 60% to 70%, cement powder 30% to 40%; the amount of binder added is 1% to 3% of the powder raw materials; the water addition ratio is: per 1m 3 100-150L of water is added to the powder raw material; the graded ceramic particles are composed of 40%-50% of ceramic particles with a particle size of 3mm≤<5mm and 50%-60% of ceramic particles with a particle size of 5mm≤≤8mm, calculated by mass percentage.

2. The unshaped refractory material for casting the coke oven bottom plate according to claim 1, characterized in that: The cement powder is silicate cement powder.

3. The unshaped refractory material for casting the coke oven bottom plate according to claim 1, characterized in that: The binder is composed of a binder, an inorganic salt dispersant and a water retainer. The binder is industrial dextrin, and by mass percentage, the industrial dextrin is ≥80%, the inorganic salt dispersant is ≤10%, and the balance is the water retainer.

4. A method for constructing a coke oven floor using the amorphous refractory material according to any one of claims 1 to 3, characterized in that: The steps include: 1) preparing powder raw materials; Mixing ceramic particles with a particle size of 3 mm ≤ < 5 mm and ceramic particles with a particle size of 5 mm ≤ ≤ 8 mm, and mixing the uniformly mixed graded ceramic particles with cement powder to obtain a powder raw material for standby use; 2) Preparation work before pouring; Before pouring the coke oven floor, the area to be poured on the coke oven floor is divided into several pouring units, and expansion joint templates are placed at the expansion joints of the coke oven floor; then the holes on the coke oven floor, including the lowering holes and cleaning holes, are protected and covered, and finally a springboard for workers to walk on is laid between each pouring unit; 3) Preparation of monolithic refractory materials; Put the powder raw materials and binder into an industrial mixer, add water and stir into an amorphous mortar, the stirring time is ≥ 20 minutes; 4) Casting of coke oven bottom plate; The divided pouring units are poured one by one, and the pouring order is from the furnace area to the furnace end. After the pouring layer of each pouring unit reaches the set height, the next pouring unit is poured. After each pouring unit is poured, the workers immediately flatten and tidy up the amorphous mortar in the pouring unit to achieve the set flatness. After all pouring units are poured and leveled, the springboards are removed in turn, and pouring is carried out at the springboards while they are removed. The pouring height is the same as the pouring height of the pouring unit. 5) Finishing work after pouring; Maintain the coke oven floor after pouring, and remove the expansion joint template immediately when the amorphous mortar loses fluidity; After the overall maintenance is completed, the height and flatness of the coke oven bottom plate are remeasured, and the parts that do not meet the design standard requirements are marked and then repaired manually.

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