Industrial furnace wall cooling device

Abstract

The utility model relates to industrial furnace technical field, concretely is a kind of industrial furnace wall cooling device, and industrial furnace hearth is equipped with cooling gas pipeline system, cooling gas control system, and industrial furnace body is equipped with cooling gas entrance, and cooling gas injection device is equipped in industrial furnace hearth;The cooling gas pipeline system is connected with the cooling gas injection device. By the utility model device, cooling gas medium is injected to industrial furnace wall, on the one hand, protects industrial furnace lining and furnace shell, on the other hand, the amount of cooling water and the heat carried by cooling water can be reduced. In addition, cooling gas medium is discharged from the furnace with the flue gas of industrial furnace, and the heat thereof can be further recovered.

Description

Technical Field

[0001] This utility model relates to the field of industrial furnace technology, specifically an industrial furnace wall cooling device. Background Technology

[0002] Industrial furnaces are thermal equipment that use fuel or electricity to heat materials or workpieces. Classified by heating method, industrial furnaces are mainly divided into two categories: one is the flame furnace (or fuel furnace), which uses solid, liquid, or gaseous fuels to burn and heat materials; the second is the electric furnace, which converts electrical energy into heat to heat materials.

[0003] In most industrial furnaces, the parts heating materials within the furnace chamber require extremely high temperatures. Due to radiation and gas convection, the furnace walls remain at high temperatures for extended periods. To ensure the furnace walls function properly and extend their lifespan, water-cooled walls or pipes are typically installed for cooling. While this guarantees the furnace's lifespan and stable production, a significant amount of heat carried away by the cooling water cannot be recovered, resulting in energy waste. It also increases water resource waste. Furthermore, the generated flue gas often reaches excessively high temperatures when used in the next process, necessitating additional cooling facilities, which both wastes thermal energy and increases investment.

[0004] Against the backdrop of the metallurgical industry's transformation from carbon smelting to hydrogen smelting, the hydrogen or hydrogen-mixed reducing gas used to reduce iron ore needs to be heated to 700-1000℃ before entering the reduction process. Existing technology uses a special heating device. Eliminating the need for a heating device or reducing the heating load is one of the demands pursued by hydrogen smelting technology. Utility Model Content

[0005] The purpose of this invention is to provide an industrial furnace wall cooling device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: An industrial furnace wall cooling device is characterized by: a cooling gas pipeline system and a cooling gas control system located outside the furnace chamber; a cooling gas inlet located on the furnace body; and at least one cooling gas injection device located inside the furnace chamber. The external cooling gas pipeline system is connected to the internal cooling gas injection device via the furnace body cooling gas inlet. By injecting cooling gas medium onto the furnace wall using this device, the furnace lining and shell are protected, and the amount of cooling water used and the heat carried away by the cooling water are reduced. Furthermore, it lowers the outlet flue gas temperature of the industrial furnace, eliminating the need for subsequent cooling processes or reducing the subsequent cooling load.

[0007] Furthermore, the cooling gas injection device can be a refractory brick with gas channels, the refractory brick with gas channels being embedded in the furnace wall, and the cooling gas pipeline system being connected to the gas channels of the refractory brick through the cooling gas inlet. Preferably, the refractory brick gas channels can be multi-layered, each layer having multiple gas channels arranged in the same direction close to the tangential direction to the furnace wall; the multiple gas channels in each layer can also be arranged radially, with the radially arranged channel bricks protruding from the inner surface of the furnace wall, and their jet nozzle direction parallel to or at a small angle to the tangential surface of the furnace wall.

[0008] Furthermore, the cooling gas injection device is characterized in that: the cooling gas injection device can be a ring pipe installed close to the inner wall of the furnace, and the ring pipe can be a complete circle or a series of broken arcs; the external cooling gas pipeline system of the furnace is connected to the ring pipe through at least one furnace cooling gas inlet. Preferably, the ring pipe has multiple injection nozzles or injection slits, and the air jet direction of the injection nozzles or injection slits is parallel to or at a small angle to the cross-section of the furnace wall. This ensures that a cooling airflow flows along the wall to remove the heat generated on the furnace wall due to radiation.

[0009] Furthermore, the cooling gas injection device is characterized in that: the cooling gas injection device can be composed of a cooling gas injection gun and a cooling gas injection gun cooling sleeve, and the cooling gas injection gun cooling sleeve is fitted over the outside of the cooling gas injection gun; the outlet direction of the cooling gas injection gun is parallel to or at a small angle to the cross-section of the furnace wall. The injection gun cooling sleeve protects the injection gun, and the arrangement of the outlet direction of the cooling gas injection gun ensures that the cooling gas travels along the furnace wall after being ejected, thereby reducing the impact on the working area of ​​the industrial furnace.

[0010] Preferably, the cooling gas spray gun is detachably mounted on the furnace wall of the industrial furnace, and the outlet end of the cooling gas spray gun has an outlet extending circumferentially along the cooling gas spray gun.

[0011] Preferably, the length of the cooling gas spray gun extending into the furnace chamber of the industrial furnace can be adjusted or fixed.

[0012] Preferably, a jacking bolt is provided at the connection between the cooling gas nozzle and the industrial furnace wall. Because the cooling gas nozzle has a water-cooled structure, the portion extending into the furnace may have adhered slag. During disassembly, the adhered slag can cause the nozzle to become stuck, making removal difficult. To ensure smooth disassembly, a jacking bolt is installed at the connection. Tightening the jacking bolt increases the gap at the connection, loosening the slag adhering to the outlet end of the cooling gas nozzle, thereby enabling disassembly.

[0013] The aforementioned "smaller included angle" refers to an included angle ≤ 30°; more preferably, it refers to an included angle ≤ 20°.

[0014] Furthermore, the feature is that when there are at least two layers of cooling gas injection devices inside the furnace, the nozzles of the upper and lower adjacent layers of cooling gas injection devices should be staggered and evenly arranged as much as possible. This ensures the uniformity and integrity of the cooling gas coverage of the furnace wall, eliminating or minimizing cooling blind spots.

[0015] Furthermore, the cooling gas control system consists of valves and display instruments. Based on actual operating conditions, the parameters of the cooling gas injected into the furnace are adjusted in a timely manner to ensure the safe and normal production of the industrial furnace.

[0016] Preferably, the cooling gas control system consists of valves and display instruments. The parameters of the cooling gas injected into the furnace are adjusted promptly according to actual operating conditions to ensure the safe and normal operation of the industrial furnace.

[0017] The beneficial effects of this invention are as follows: By spraying cooling gas medium onto the furnace wall using this device, the furnace lining and shell are protected, extending the furnace's service life. Furthermore, the amount of cooling water used and the heat carried away by the cooling water are reduced, improving the furnace's energy utilization efficiency and lowering production costs. Additionally, the outlet flue gas temperature is lowered, eliminating the need for subsequent cooling processes or reducing their load. Moreover, if the furnace flue gas and the injected cooling gas are used in subsequent processes, this invention also heats the injected cooling gas, eliminating the need for additional heating devices or reducing their load. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the industrial furnace wall cooling device in Example 1; Figure 2 This is a cross-sectional view (AA) of the industrial furnace wall cooling device in Example 1; Figure 3 This is a partially enlarged view of the industrial furnace wall cooling device of Example 1; Figure 4 This is a schematic diagram of the industrial furnace wall cooling device in Example 3; Figure 5 This is a schematic diagram of the cooling gas spray gun in the industrial furnace wall cooling device of Example 4; Figure 6 yes Figure 5 Sectional view of AA; Figure 7 This is a schematic diagram of the industrial furnace wall cooling device in Example 5; Figure 8 yes Figure 7 Sectional view of AA; Figure 9 This is a schematic diagram of the industrial furnace wall cooling device in Example 6; Figure 10The refractory bricklaying method in the industrial furnace wall cooling device of Example 6 is shown. Figure 11 This is a partial schematic diagram of the industrial furnace wall cooling device in Example 7; Figure 12 This is a schematic diagram of the industrial furnace wall cooling device in Example 8; Wherein: 1-Cooling gas pipeline system, 2-Cooling gas control system, 3-Cooling gas inlet, 4-Cooling gas jetting device, 41-Cooling gas spray gun, 42-Cooling gas spray gun cooling jacket; 43-Outlet; 44-First flange; 45-Second flange; 46-Pulling bolt; 47-Third flange; 48-Sealing packing. Detailed Implementation

[0019] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily implement it. This utility model can be embodied in many different forms and is not limited to the embodiments described herein.

[0020] To clearly illustrate this utility model, parts unrelated to the description are omitted, and throughout the specification, the same or similar constituent elements are given the same reference numerals.

[0021] Throughout the instruction manual, when it is mentioned that a certain part "includes" a certain constituent element, unless there is a particularly contrary statement, it does not exclude other constituent elements, but rather means that other constituent elements may also be included.

[0022] Example 1 The following reference Figure 1 , 2 3. This section describes an industrial furnace wall cooling device according to the first embodiment. The industrial furnace wall cooling device of the first embodiment includes a cooling gas pipeline system 1, a cooling gas control system 2, a cooling gas inlet 3, and a cooling gas injection device 4. The cooling gas pipeline system 1 and the cooling gas control system 2 are located outside the furnace chamber of the industrial furnace. The cooling gas inlet 3 is located on the furnace body, and the cooling gas injection device 4 is located inside the furnace chamber. The cooling gas injection device 4 consists of a cooling gas spray gun 41 and a cooling gas spray gun cooling sleeve 42. The cooling gas spray gun cooling sleeve 42 is fixed to the cooling gas inlet 3, and the cooling gas pipeline system 1 is connected to the cooling gas injection device 4. The cooling gas inlet 3 is arranged approximately tangentially to the circumference of the industrial furnace wall. The outlet direction of the cooling gas spray gun is parallel to the transverse cross-section of the furnace wall.

[0023] Cooling gas in cooling gas pipeline system 1 is injected into the industrial furnace through cooling gas injection device 4. Due to the arrangement of cooling gas inlet 3 on the furnace body, after being injected into the furnace, the cooling gas moves forward and upward along the injection direction while adhering to the furnace wall, cooling the furnace wall during this movement, and is eventually discharged outside the furnace with the flue gas. Based on the actual operating conditions of the industrial furnace, the cooling gas parameters injected into the furnace are controlled by cooling gas control system 2 to achieve safe and stable production of the industrial furnace.

[0024] Example 2 The rest is the same as in Embodiment 1, except that multiple layers of cooling gas inlets 3 are set at different heights. The upper and lower adjacent cooling gas inlets are not on the same vertical cross-section; this is to make the cooling coverage of the cooling gas wider and the distribution more uniform. The outlet direction of the cooling gas nozzle forms a 15° angle with the cross-section of the furnace wall.

[0025] Example 3 The following reference Figure 4 This describes a furnace wall cooling device for an industrial furnace according to the third embodiment. It is otherwise the same as in embodiment 1, except that the cooling gas inlet 3 is arranged radially. A cooling gas nozzle 41 extends into and protrudes from the industrial furnace through the cooling gas inlet 3. The protruding end of the cooling gas nozzle 41 is sealed, and a cooling gas outlet is provided on the side wall of the protruding cooling gas nozzle 41, with the outlet direction parallel to the furnace wall cross-section.

[0026] Cooling gas in cooling gas pipeline system 1 is injected into the industrial furnace through cooling gas injection device 4. After being injected into the furnace, the cooling gas moves forward and upward along the furnace wall in the injection direction, cooling the furnace wall during its movement, and is eventually discharged outside the furnace with the flue gas. Based on the actual operating conditions of the industrial furnace, the cooling gas parameters injected into the furnace are controlled by cooling gas control system 2 to achieve safe and stable production of the industrial furnace.

[0027] Example 4 The following reference Figure 5 and Figure 6This describes a furnace wall cooling device for an industrial furnace according to Embodiment 4. Other aspects are the same as in Embodiment 3, except that the cooling gas spray gun 41 is detachably mounted on the furnace wall. A cooling gas spray gun cooling sleeve 42 is fitted over the cooling gas spray gun 41. The outlet end of the cooling gas spray gun 41 has a circumferentially extending outlet 43. Specifically, the cooling gas spray gun 41 has a first flange 44, and the industrial furnace has a second flange 45. The second flange 45 and a third flange 47 that mates with the second flange 45 are detachably connected by bolts. A sealing filler 48 is provided between the tightening gap of the second flange 45 and the third flange 47. When the bolts tighten the second flange 45 and the third flange 47, the sealing filler 48 is pressed against the outer surface of the cooling gas spray gun 41, serving to lock and seal the spray gun. When the bolts are loosened, the sealing filler 48 is released from the outer surface of the spray gun body, allowing the spray gun body to move along the insertion direction, thereby adjusting the insertion depth. That is, the length of the cooling gas spray gun extending into the furnace chamber in the cooling device provided in this embodiment is adjustable.

[0028] Meanwhile, a jacking bolt 46 is provided between the first flange 44 and the second flange 45. Because the cooling gas nozzle 41 has a water-cooled structure, the portion extending into the furnace may have adhered slag. During disassembly of the cooling gas nozzle 41, the adhered slag may jam it, making removal difficult. To ensure smooth disassembly of the cooling gas nozzle 41, a jacking bolt 46 is provided at the connection point. Tightening the jacking bolt 46 increases the distance at the connection point, loosening the slag adhered to the outlet end of the cooling gas nozzle, thereby enabling disassembly.

[0029] Example 5 The following reference Figure 7 and Figure 8 This describes a furnace wall cooling device for an industrial furnace according to Embodiment 5. Other aspects are the same as in Embodiment 4, except that the cooling gas spray gun 41 is detachably mounted on the furnace wall via a connection between a first flange 44 and a second flange 45. In this embodiment, the first flange 44 and the second flange 45 are connected by a jacking bolt 46, and a third flange 47 and sealing packing 48 are no longer provided. That is, the length of the cooling gas spray gun extending into the furnace chamber of the industrial furnace in the cooling device provided in this embodiment is fixed and cannot be adjusted.

[0030] Example 6 The following reference Figure 9This describes a furnace wall cooling device according to the sixth embodiment of an industrial furnace. The sixth embodiment of the industrial furnace wall cooling device includes a cooling gas pipeline system 1, a cooling gas control system 2, a cooling gas inlet 3, and a cooling gas injection device 4. The cooling gas pipeline system 1 and the cooling gas control system 2 are located outside the furnace chamber of the industrial furnace, the cooling gas inlet 3 is located on the furnace body, and the cooling gas injection device 4 is located inside the furnace chamber. Figure 10 As shown, the cooling gas injection device 4 is a refractory brick with a gas channel. The refractory brick protrudes into the furnace and is embedded in adjacent refractory bricks to make the structure more stable. The gas channel is arranged in the radial direction, and its jet nozzle direction is parallel to the longitudinal section of the furnace wall. The cooling gas pipeline system 1 passes through the cooling gas inlet 3 and is connected to the refractory brick gas channel.

[0031] Cooling gas in cooling gas pipeline system 1 is injected into the industrial furnace through cooling gas injection device 4. The gas outlet of cooling gas injection device 4 faces upward. After being injected into the industrial furnace, the cooling gas moves upward along the furnace wall, cooling the furnace wall during its movement, and is eventually discharged outside the industrial furnace with the flue gas. According to the actual operating conditions of the industrial furnace, the parameters of the cooling gas injected into the industrial furnace are controlled by cooling gas control system 2 to achieve safe and stable production of the industrial furnace.

[0032] Example 7 The following reference Figure 11 This describes a furnace wall cooling device for an industrial furnace according to Embodiment 7. Other aspects are the same as in Embodiment 6, except for the installation configuration of the cooling gas injection device 4, which facilitates maintenance and replacement of the cooling gas injection device 4 from outside the industrial furnace.

[0033] Example 8 The following reference Figure 12This describes an industrial furnace wall cooling device according to Embodiment 8. The industrial furnace wall cooling device of Embodiment 8 includes a cooling gas pipeline system 1, a cooling gas control system 2, a cooling gas inlet 3, and a cooling gas injection device 4. The cooling gas pipeline system 1 and the cooling gas control system 2 are located outside the furnace chamber of the industrial furnace. The cooling gas inlet 3 is located on the furnace body, and the cooling gas injection device 4 is located inside the furnace chamber. The cooling gas injection device 4 is a complete circular pipe with injection slits on it, and the injection slits are directed upwards. This arrangement allows the airflow to easily and evenly cover the furnace wall, ensuring stable airflow direction and uniform changes in the covered furnace wall, thus helping to extend the lifespan of the furnace wall (including water-cooled pipes and refractory materials). Simultaneously, the effects of airflow convergence and collision are greatly reduced, minimizing the impact on the central combustion zone. To ensure the service life of the cooling gas injection device 4, a cooling sleeve is installed on the cooling gas injection device 4, which is cooled by water or other cooling media. The cooling gas pipeline system 1 passes through the cooling gas inlet 3 and is connected to the cooling gas injection device 4, thereby fixing the cooling gas injection device 4 in place. The cooling gas injection device 4 is in close contact with the furnace wall to prevent dust from passing between the furnace wall and the ring pipe, thus preventing increased wear.

[0034] Cooling gas in cooling gas pipeline system 1 is injected into the industrial furnace through cooling gas injection device 4. After entering the furnace, the cooling gas moves upward along the furnace wall, cooling the furnace wall during its movement, and is eventually discharged outside the furnace with the flue gas. Based on the actual operating conditions of the industrial furnace, the cooling gas parameters injected into the furnace are controlled by cooling gas control system 2 to achieve safe and stable production of the industrial furnace.

[0035] Example 9 The rest is the same as in Embodiment 8, except that the cooling gas blowing device 4 is a discontinuous multi-segment arc, which is beneficial for installation.

[0036] Example 10 The rest is the same as in embodiment 8, except that a guide plate 9 is provided below the cooling gas blowing device 4 to cover the gap between the inner ring pipe and the furnace wall, so as to better prevent dust from passing between the furnace wall and the ring pipe and increasing wear.

[0037] Example 11 A method for cooling the furnace chamber of an industrial furnace, using the industrial furnace wall cooling device provided in any one of Examples 1-10, wherein cooling gas in the cooling gas pipeline system is injected into the industrial furnace through a cooling gas injection device. After being injected into the industrial furnace, the cooling gas moves forward and upward along the injection direction along the furnace wall, thereby cooling the furnace wall during the movement, and is then discharged out of the industrial furnace with the flue gas.

[0038] The cooling gas can be an inert gas or a reducing gas, as long as it does not contain oxygen. The inert gas can be nitrogen, argon, etc.; the reducing gas can be coal gas, hydrogen, etc.

[0039] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any changes or modifications to the above embodiments within the scope of the essential spirit of the present utility model will fall within the scope of the claims of the present utility model.

Claims

1. An industrial furnace wall cooling device, characterized by: The industrial furnace is equipped with a cooling gas pipeline system and a cooling gas control system outside the furnace chamber. The furnace body has a cooling gas inlet, and at least one cooling gas injection device is installed inside the furnace chamber. The external cooling gas pipeline system is connected to the internal cooling gas injection device via the furnace body cooling gas inlet. The cooling gas injection device is a refractory brick with a gas channel. The refractory brick with the gas channel is embedded in the furnace wall, and the cooling gas pipeline system is connected to the gas channel of the refractory brick through the cooling gas inlet. Alternatively, the cooling gas injection device is a ring pipe installed close to the inner wall of the furnace. The ring pipe is a complete circular ring or a series of broken arcs. The external cooling gas pipeline system of the furnace is connected to the ring pipe through at least one furnace cooling gas inlet. Alternatively, the cooling gas injection device may consist of a cooling gas spray gun and a cooling gas spray gun cooling sleeve, with the cooling gas spray gun cooling sleeve fitted over the outside of the cooling gas spray gun; the outlet direction of the cooling gas spray gun is parallel to or at an angle to the cross-section of the furnace wall, wherein the angle is ≤30°.

2. The industrial furnace wall cooling device according to claim 1, characterized in that: The refractory brick gas channel is multi-layered, with multiple gas channels in each layer arranged in the same direction and close to the tangential direction with the furnace wall. Alternatively, multiple gas channels on each layer can be arranged radially. The radially arranged channel bricks must protrude from the inner surface of the furnace wall, and the direction of their gas nozzles must be parallel to or at an angle to the cross-section of the furnace wall, wherein the angle is ≤30°.

3. The industrial furnace wall cooling device according to claim 1, characterized in that: The ring pipe has multiple injection nozzles or injection slits, and the jet direction of the injection nozzles or injection slits is parallel to or at an angle to the cross-section of the furnace wall, wherein the angle is ≤30°.

4. The industrial furnace wall cooling device according to claim 1, characterized in that: The cooling gas spray gun is detachably mounted on the furnace wall of the industrial furnace, and the outlet end of the cooling gas spray gun has an outlet extending circumferentially along the cooling gas spray gun.

5. The industrial furnace wall cooling device according to claim 1, characterized in that: The length of the cooling gas spray gun extending into the furnace chamber of the industrial furnace can be adjusted or fixed.

6. The industrial furnace wall cooling device as claimed in claim 1, characterized in that: The connection between the cooling gas spray gun and the industrial furnace wall is provided with a top-opening bolt.

7. The industrial furnace wall cooling device according to any one of claims 1 to 6, characterized in that, The included angle is ≤20°.

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