Hot blast stove for chlorination process titanium dioxide

Abstract

The hot blast stove comprises a stove body, a burner is arranged at the head end of the stove body, the stove body comprises a shell and an inner container, a burning cavity is formed in the inner container, one end of the burner is inserted into the burning cavity along the axial center, a primary air inlet is formed in the burner, and a secondary air distribution pipe set is arranged in the burning cavity. The secondary air distribution pipe set comprises a set of inner secondary air distribution pipes evenly arranged around the outer side wall of the combustor and a set of outer secondary air distribution pipes evenly arranged around the inner side wall of the inner container. Air outlet holes are formed in the tail ends of the inner secondary air distribution pipe and the outer secondary air distribution pipe; and the space between every two adjacent inner secondary air distribution pipes and the space between every two adjacent outer secondary air distribution pipes are filled with refractory materials. By arranging the secondary air distribution pipe set, secondary combustion can be participated, the combustion sufficiency is improved, meanwhile, cooling protection can be formed on the inner container and the combustor, and the service life of the combustor and the service life of the inner container are prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of chloride process titanium dioxide production, and specifically relates to a hot air furnace for chloride process titanium dioxide. Background Art

[0002] In the prior art, in the production process of titanium dioxide by the chloride process, a dehydration and drying system is required to dry the titanium dioxide filter cake after washing and filtration before steam pulverization, so as to dehydrate it to the required water content and fineness before steam pulverization.

[0003] The existing dehydration and drying system uses the hot air from the hot blast furnace in the drying chamber. Through the combined action of the stirring blade and the hot air rotating airflow, the material is strongly sheared, blown, rotated, crushed, and refined, and dehydrated at the same time. After the material is dehydrated, it is separated from the air by separation equipment. The hot blast furnace uses the fuel combustion in the burner to generate heat to form combustion hot air, which is transported to the drying chamber by the hot blast furnace. Due to the high combustion temperature, the inner tank and burner of the hot blast furnace are partially overheated, and the inner tank and burner are easily damaged. Some technologies use air-cooled jackets to reduce the temperature of the inner tank, but the heat loss is large, and the flame directly scours the side wall of the inner tank. The outer air-cooled jacket has little effect on the side wall of the inner tank, and the inner tank is still easily damaged. Utility Model Content

[0004] The purpose of the utility model is to provide a hot blast furnace for chloride process titanium dioxide in order to solve the deficiencies of the prior art.

[0005] The purpose of this utility model is achieved by the following technical solutions:

[0006] A hot air furnace for chloride titanium dioxide, comprising a furnace body, a burner is arranged at the head end of the furnace body, the furnace body comprises an outer shell and an inner shell, the interior of the inner shell is a combustion chamber, one end of the burner is inserted into the combustion chamber along the axial center, a primary air inlet is arranged on the burner, and a secondary air distribution duct group is arranged in the combustion chamber;

[0007] The secondary air distribution duct group includes a group of inner secondary air distribution ducts uniformly arranged around the outer side wall of the burner, and a group of outer secondary air distribution ducts uniformly arranged around the inner side wall of the inner tank; the tail ends of the inner secondary air distribution ducts and the outer secondary air distribution ducts are provided with air outlet holes;

[0008] Refractory materials are filled between two adjacent inner secondary air distribution ducts and between two adjacent outer secondary air distribution ducts.

[0009] Preferably, the head ends of the inner secondary air distribution duct and the outer secondary air distribution duct are connected with an air distribution cylinder, and the air distribution cylinder is provided with a secondary air inlet.

[0010] Preferably, the number of the inner secondary air distribution ducts is 6 to 10;

[0011] The number of the external secondary air distribution ducts is 6 to 10.

[0012] Preferably, the inner tank is made of ceramic refractory material.

[0013] Preferably, the refractory material is high-alumina refractory brick.

[0014] The present application provides a secondary air distribution duct group, which can not only participate in secondary combustion and improve combustion completeness, but also provide cooling protection for the inner tank and burner, thereby extending the service life of the burner and inner tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a hot blast furnace provided in a preferred embodiment of the present application;

[0016] Figure 2 It is a schematic diagram of the arrangement of the secondary air distribution duct group;

[0017] Among them, 1-shell; 2-inner tank; 3-burner; 4-combustion chamber; 5-primary air inlet; 6-fuel inlet; 7-inner secondary air distribution duct; 8-outer secondary air distribution duct; 9-air distribution tube; 10-air outlet; 11-refractory material. DETAILED DESCRIPTION

[0018] The utility model provides a hot air furnace for chloride process titanium dioxide, such as Figures 1-2 As shown, it includes a furnace body, a burner 3 is provided at the head end of the furnace body, and an air outlet 10 is provided at the tail end. The furnace body includes an outer shell 1 and an inner shell 2, the interior of the inner shell is a combustion chamber 4, one end of the burner is inserted into the combustion chamber along the axial center, a primary air inlet 5 and a fuel inlet 6 are provided on the burner, and a secondary air distribution duct group is provided in the combustion chamber.

[0019] The secondary air distribution duct group includes a group of inner secondary air distribution ducts 7 evenly arranged around the outer side wall of the burner, and a group of outer secondary air distribution ducts 8 evenly arranged around the inner side wall of the inner tank; the tail ends of the inner secondary air distribution ducts and the outer secondary air distribution ducts are provided with air outlet holes. Refractory materials 11 are filled between two adjacent inner secondary air distribution ducts and between two adjacent outer secondary air distribution ducts. The refractory materials can be made of high-alumina bricks, corundum bricks, etc., and can withstand high temperatures of about 1000°C.

[0020] The fuel burns in the burner under the action of primary air, generating high-temperature overheated combustion hot air, which is ejected from the top of the burner to the combustion chamber and flushes the inner wall of the liner. Therefore, the liner is easily damaged by high temperature, and the burner itself is also easily damaged by excessive temperature.

[0021] The present application introduces secondary air to the outer wall of the burner and the inner wall of the inner liner by setting a secondary air distribution duct group. The secondary air can cool and protect the inner wall of the inner liner and the outer wall of the burner during the flow of the air distribution duct and after flowing out from the air outlet, thereby extending the service life of the burner and the inner liner. The refractory material filled between the secondary air distribution ducts can protect the outer wall of the burner and the inner wall of the inner liner that are not covered by the secondary air distribution ducts, absorb heat, improve the heat resistance of the burner and the inner liner, and extend their service life. On the other hand, during the flow of the secondary air distribution duct, the temperature of the secondary air is increased by the preheating effect of the burner and the inner liner, and the hot combustion air ejected from the burner is re-combusted under the action of the secondary air, which can fully burn the unburned particles contained in the hot combustion air again, thereby improving the combustion efficiency. Compared with the primary air, the secondary air uses preheated air to improve the completeness of combustion.

[0022] Therefore, the present application provides a secondary air distribution duct group, which can not only participate in secondary combustion and improve combustion completeness, but also provide cooling protection for the inner tank and burner, thereby extending the service life of the burner and inner tank.

[0023] Preferably, the head ends of the inner secondary air distribution duct and the outer secondary air distribution duct are connected with an air distribution cylinder 9, which is provided with a secondary air inlet, and the secondary air is evenly distributed to each secondary air distribution duct through the air distribution cylinder. The secondary air can be the return air after drying.

[0024] Preferably, the length of the inner secondary air distribution duct and the outer secondary air distribution duct is not greater than the length of the burner, and the secondary air ejected from the secondary air distribution duct can be mixed with the combustion hot air ejected from the burner to cause the combustion hot air to be secondary burned.

[0025] Preferably, since the size of the inner tank is larger than that of the burner, the diameter of the outer secondary air distribution duct is larger than that of the inner secondary air distribution duct, that is, the ventilation volume of the outer secondary air distribution duct is larger than that of the inner secondary air distribution duct.

[0026] As those skilled in the art can understand, the primary air inlet and the secondary air inlet are connected to fans to adjust the air volume.

[0027] Preferably, the number of inner secondary air distribution ducts is 6 to 10; the number of outer secondary air distribution ducts is 6 to 10.

[0028] The inner tank can be made of ceramic refractory materials such as corundum, or heat-resistant stainless steel materials.

[0029] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A hot blast furnace for chloride titanium dioxide, comprising a furnace body, a burner is provided at the head end of the furnace body, the furnace body comprises an outer shell and an inner shell, the interior of the inner shell is a combustion chamber, characterized in that: One end of the burner is inserted into the combustion chamber along the axial center, a primary air inlet is provided on the burner, and a secondary air distribution duct group is provided in the combustion chamber; The secondary air distribution duct group includes a group of inner secondary air distribution ducts uniformly arranged around the outer side wall of the burner, and a group of outer secondary air distribution ducts uniformly arranged around the inner side wall of the inner tank; the tail ends of the inner secondary air distribution ducts and the outer secondary air distribution ducts are provided with air outlet holes; Refractory materials are filled between two adjacent inner secondary air distribution ducts and between two adjacent outer secondary air distribution ducts.

2. The hot blast furnace for chloride-process titanium dioxide according to claim 1, characterized in that: The head ends of the inner secondary air distribution duct and the outer secondary air distribution duct are connected with an air distribution cylinder, and the air distribution cylinder is provided with a secondary air inlet.

3. The hot blast furnace for chloride process titanium dioxide according to claim 1, characterized in that: The number of the inner secondary air distribution ducts is 6 to 10; The number of the external secondary air distribution ducts is 6 to 10.

4. The hot blast furnace for chloride process titanium dioxide according to claim 1, characterized in that: The inner tank is made of ceramic refractory material.

5. The hot blast furnace for chloride-process titanium dioxide according to claim 1, characterized in that: The refractory material is high-alumina refractory brick.

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