CN212512534U

CN212512534U - Heat-resistant flue of petroleum coke calcining furnace

Info

Publication number: CN212512534U
Application number: CN202021069207.1U
Authority: CN
Inventors: 马汝杰; 张永利
Original assignee: Shandong Zhongyang Carbon Stock Co ltd
Current assignee: Shandong Zhongyang New Material Technology Co ltd
Priority date: 2020-06-11
Filing date: 2020-06-11
Publication date: 2021-02-09
Anticipated expiration: 2030-06-11

Abstract

A heat-resistant flue of a petroleum coke calcining furnace is characterized in that the cross section of the heat-resistant flue is square; the bottom of the heat-resistant flue is sequentially provided with a fire-resistant layer A and a heat-insulating layer from inside to outside, and a foundation is arranged below the bottom of the heat-resistant flue; the fire-resistant layer A, the heat-insulating layer and the steel wire mesh which are connected through the anchoring nails are sequentially arranged on two sides of the heat-resistant flue from inside to outside; the top of the heat-resistant flue is sequentially provided with a fire-resistant layer B, a heat-insulating layer and a steel wire mesh from inside to outside; and protective layers are arranged outside the two sides and the top of the heat-resistant flue. The heat-resistant flue of the petroleum coke calcining furnace is reinforced by optimizing the structure of the flue; the top of the flue is set to be a prefabricated refractory pouring plate, so that the structure of the top of the flue is reinforced; the tensile resistance and the shrinkage resistance of the flue are improved by additionally arranging the steel wire mesh outside the heat insulation layer.

Description

Heat-resistant flue of petroleum coke calcining furnace

Technical Field

The utility model relates to a petroleum coke calcination technical field especially relates to a petroleum coke calciner heat-resisting flue.

Background

Petroleum coke is a black or dark gray hard solid petroleum product with metallic luster and porosity, and is a carbon substance formed by granular, columnar or needle-shaped crystals of tiny graphite. The petroleum coke component is hydrocarbon containing carbon 90-97 wt% and hydrogen 1.5-8 wt%, and also contains nitrogen, chlorine, sulfur and heavy metal compounds. Petroleum coke is a byproduct produced when raw oil of a delayed coking device is cracked at high temperature to produce light oil. The petroleum coke yield is about 25-30% of the raw oil. Its low-level heat productivity is about 1.5-2 times of coal, ash content is not greater than 0.5%, volatile component is about 11%, and its quality is close to that of anthracite. In the case of a graphite electrode for steel making or an anode paste (melting electrode) for aluminum or magnesium making, green coke must be calcined to meet the requirements for petroleum coke (green coke). The calcining temperature is generally about 1300 ℃, so that petroleum coke volatile components are removed as much as possible. Therefore, the hydrogen content of petroleum coke remanufacturing products can be reduced, the graphitization degree of the petroleum coke is improved, the high-temperature strength and the heat resistance of the graphite electrode are improved, and the conductivity of the graphite electrode is improved. The calcined coke is mainly used for producing graphite electrodes, carbon paste products, diamond dust, food-grade phosphorus industry, metallurgical industry, calcium carbide and the like, wherein the graphite electrodes are most widely applied.

The calcining of petroleum coke by a pot calciner is a processing technology which is commonly used at home and abroad. The indirect heating of the carbon material is realized in a fixed charging bucket, so that the carbon material is heated to complete the calcination process. The pot calciner is one of the furnace types widely used in the carbon industry. During calcination, the raw materials are added into the tank through the top feeding device, and are gradually heated by flame paths positioned at two sides of the charging tank in the process of moving from top to bottom. The heat generated by the combustion of the fuel in the flue is indirectly transferred to the feedstock through the walls of the flue. When the temperature of the raw materials reaches 350-600 ℃, a large amount of volatile components in the raw materials are released. The volatile components are collected through the volatile component channel and sent into a flame path for combustion. The combustion of volatiles is yet another source of heat for the can calciner. After a series of physicochemical changes of the raw materials are finished at a high temperature of more than 1200-1300 ℃, the raw materials enter a water jacket from the bottom of a charging bucket for cooling, and are finally discharged out of the furnace by a discharging device. The waste flue gas after heat exchange is sent into a waste heat boiler to produce steam by using the waste heat of the waste flue gas or sent into a heat exchange chamber to preheat air for fuel and volatile matter to burn.

The temperature of high-temperature flue gas generated by the existing pot-type calcining furnace is generally 900-. High-temperature flue gas generated by the pot-type calcining furnace reaches the waste heat boiler through the flue, and the existing flue is always in contact with the high-temperature flue gas, so that the flue is very easy to collapse under the actions of expansion and contraction with heat and corrosion of the flue gas, and the flue with stable structure, expansion and contraction with heat resistance and good corrosion resistance to the flue gas needs to be designed.

SUMMERY OF THE UTILITY MODEL

In order to solve the existing problems, the utility model provides a heat-resistant flue of a petroleum coke calcining furnace, which is characterized in that the flue structure is optimized, and the flue is reinforced; the top of the flue is set to be a prefabricated refractory pouring plate, so that the structure of the top of the flue is reinforced; the tensile resistance and the shrinkage resistance of the flue are improved by additionally arranging the steel wire mesh outside the heat insulation layer.

The purpose of the utility model is realized through the following technical scheme.

A heat-resistant flue of a petroleum coke calcining furnace is characterized in that the cross section of the heat-resistant flue is square; the bottom of the heat-resistant flue is sequentially provided with a fire-resistant layer A and a heat-insulating layer from inside to outside, and a foundation is arranged below the bottom of the heat-resistant flue; the fire-resistant layer A, the heat-insulating layer and the steel wire mesh which are connected through the anchoring nails are sequentially arranged on two sides of the heat-resistant flue from inside to outside; the top of the heat-resistant flue is sequentially provided with a fire-resistant layer B, a heat-insulating layer and a steel wire mesh from inside to outside; and protective layers are arranged outside the two sides and the top of the heat-resistant flue.

According to the petroleum coke calciner heat-resistant flue, the protective layer is a concrete masonry layer.

According to the heat-resisting flue of the petroleum coke calcining furnace, the thread steel is arranged in the protective layer, and the bottoms of the thread steel on two sides are inserted into the foundation.

According to the heat-resisting flue of the petroleum coke calcining furnace, the screw thread steels are arranged on two sides and the top of the protective layer, and two adjacent screw thread steels are arranged at an interval of 1 meter.

According to the heat-resistant flue of the petroleum coke calcining furnace, the fire-resistant layer A is built by adopting refractory bricks.

According to the heat-resistant flue of the petroleum coke calcining furnace, the fire-resistant layer B is a refractory castable precast slab.

In the heat-resistant flue of the petroleum coke calcining furnace, the heat-insulating layer adopts a high-temperature heat-insulating material.

According to the heat-resistant flue of the petroleum coke calcining furnace, the heat-insulating layer is made of aluminum silicate fibers.

The beneficial effects of the utility model reside in that:

1. the heat-resistant flue of the petroleum coke calcining furnace of the utility model reinforces the flue by optimizing the structure of the flue;

2. the heat-resistant flue of the petroleum coke calcining furnace realizes the structural reinforcement of the top of the flue by arranging the top of the flue into the prefabricated fire-resistant pouring plate;

3. the utility model discloses a heat-resisting flue of petroleum coke calcining furnace, stretch-proof and the resistant shrink performance of flue have been increased through install the wire net additional outside the thermal-insulated layer.

Drawings

The aspects and advantages of the present application will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. In the drawings:

fig. 1 is a schematic cross-sectional structure diagram of a heat-resistant flue of a petroleum coke calcining furnace in an embodiment of the present invention.

The components represented by the reference numerals in the figures are:

foundation 1, screw-thread steel 2, flame retardant coating A3, flame retardant coating B4, insulating layer 5, anchor nail 6, wire net 7, protective layer 8.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided so that this disclosure can be more completely understood and fully conveyed to those skilled in the art, and the present disclosure may be implemented in various forms without being limited to the embodiments set forth herein.

Referring to fig. 1, fig. 1 is a schematic cross-sectional structural diagram of a heat-resistant flue of a petroleum coke calcining furnace according to an embodiment of the present invention. As shown in the figure, the section of the heat-resistant flue is square, most of the traditional flues are of structures with arched tops built by refractory bricks, and the arched structures are easy to collapse under the action of long-time expansion with heat and contraction with cold; the bottom of the heat-resistant flue is sequentially provided with a fire-resistant layer A3 and a heat-insulating layer 5 from inside to outside, a foundation 1 is arranged below the bottom of the heat-resistant flue, and the foundation 1 is taken as the ground which is understood by a person skilled in the art to be a stable ground and is generally a concrete pouring ground; the fire-resistant layer A3, the heat-insulating layer 5 and the steel wire mesh 7 which are connected through the anchoring nails 6 are sequentially arranged on the two sides of the heat-resistant flue from inside to outside; the top of the heat-resistant flue is sequentially provided with a fire-resistant layer B4, a heat-insulating layer 5 and a steel wire mesh 7 from inside to outside, preferably, all layers at the top of the heat-resistant flue can be connected together by using anchoring nails 6 (not shown in the figure), and a person skilled in the art can use the anchoring nails 6 at the top of the heat-resistant flue according to the using method of the anchoring nails 6 at two sides of the heat-resistant flue; and protective layers 8 are arranged outside the two sides and the top of the heat-resisting flue.

Further, the protective layer 8 is a concrete masonry layer, and the protective layer 8 is masonry after all four sides of the heat-resistant flue are finished.

Preferably, during the laying of the protective layer 8, deformed steel bars 2 are placed inside said protective layer 8 to increase the strength of the protective layer 8; the bottoms of the deformed steel bars 2 on two sides are inserted into the foundation 1, holes can be punched on the foundation 1, and then the deformed steel bars 2 are inserted into the holes; the deformed steel bar 2 on the top is only paved on the top, and can be firstly placed on the steel wire mesh 7 on the top or a part of concrete is firstly built, the deformed steel bar 2 is placed on the concrete, and then the deformed steel bar 2 is buried by the concrete.

Further, the deformed steel bars 2 are arranged on two sides and the top of the protective layer 8, two adjacent deformed steel bars 2 are arranged at an interval of 1 meter, the deformed steel bars 2 on the two sides and the top can also be arranged in a staggered manner, the specific arrangement condition can be determined according to the actual condition of a factory, the interval can be properly reduced at the weak part, and the interval can be properly increased at other parts.

Refractory materials are generally divided into two categories, namely unshaped refractory and shaped refractory. The unshaped refractory material, also called as casting material, is a mixed powder granule composed of various aggregates or aggregates and one or more kinds of adhesives, and when in use, the unshaped refractory material must be matched with one or more kinds of liquids to be stirred uniformly, and has stronger fluidity. The shaped refractory material is generally a refractory brick, the shape of which has standard rules and can also be temporarily processed when being built and cut as required. The fire-resistant layers A3 at the bottom and two sides of the heat-resistant flue are built by adopting refractory bricks; and the refractory layer B4 on the top of the heat-resistant flue is a refractory castable precast slab, and preferably, a steel wire mesh, a steel wire and the like can be added into the castable to reinforce the refractory castable precast slab when the refractory layer B4 is precast.

Further, the heat insulating layer 5 is a heat insulating material for high temperature; preferably, the heat insulation layer 5 is made of aluminum silicate fiber; the heat insulating material is a material capable of blocking heat flow transmission, and is also called a heat insulating material. Conventional thermal insulation materials such as glass fiber, asbestos, rock wool, silicate, etc., and novel thermal insulation materials such as aerogel blankets, vacuum panels, etc. The material or the material composite body for resisting heat flow transmission, which is used for building envelopes or thermal equipment, comprises heat insulation materials and cold insulation materials. The heat insulating material meets the heat environment of building space or thermal equipment on one hand, and saves energy on the other hand. Therefore, some countries consider the thermal insulation material as "fifth largest energy" following coal, oil, natural gas, nuclear energy. When the temperature in the furnace is transferred out, the temperature is between 500 DEG and 700 DEG, and the heat can be effectively isolated from the outside by arranging the heat insulating layer; specifically, the heat insulation layer 5 is made of aluminum silicate fibers; the aluminum silicate fiber is a substance with low thermal conductivity, excellent thermal stability and chemical stability, no binder and no corrosiveness; the application of the method comprises the following steps: filling the interlayer of the equipment, fiber casting materials, coating materials, vacuum forming product materials and the like.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A heat-resistant flue of a petroleum coke calcining furnace is characterized in that the section of the heat-resistant flue is square; the bottom of the heat-resistant flue is sequentially provided with a fire-resistant layer A (3) and a heat-insulating layer (5) from inside to outside, and a foundation (1) is arranged below the bottom of the heat-resistant flue; the fire-resistant layer A (3), the heat-insulating layer (5) and the steel wire mesh (7) which are connected through the anchoring nails (6) are sequentially arranged on the two sides of the heat-resistant flue from inside to outside; the top of the heat-resistant flue is sequentially provided with a fire-resistant layer B (4), a heat-insulating layer (5) and a steel wire mesh (7) from inside to outside; and protective layers (8) are arranged outside the two sides and the top of the heat-resistant flue.

2. The refinery coke calciner flues of claim 1 wherein the protective layer (8) is a concrete masonry.

3. The refinery coke calciner flues of claim 2 wherein the thread steel (2) is arranged in the protective layer (8), and the bottom of the thread steel (2) on both sides is inserted into the foundation (1).

4. The refinery coke calciner flues of claim 3, wherein the deformed steel bars (2) are arranged at the two sides and the top of the protective layer (8), and two adjacent deformed steel bars (2) are arranged at intervals of 1 meter.

5. The heat-resisting flue of the petroleum coke calcining furnace as claimed in claim 1, characterized in that the fire-resisting layer A (3) is built by refractory bricks.

6. The heat-resisting flue of the petroleum coke calcining furnace as claimed in claim 1, characterized in that the refractory layer B (4) is a refractory castable precast slab.

7. The heat-resistant flue for petroleum coke calcining furnace as claimed in claim 1, characterized in that the heat-insulating layer (5) is made of a high-temperature heat-insulating material.

8. The refinery coke calciner flue head as claimed in claim 7, wherein the thermal insulation layer (5) is made of aluminosilicate fibers.