Blast furnace gas heater with preposed dehydration device

Abstract

A blast furnace gas heater with a preposed dehydration device is characterized by comprising a gas dehydration device and a gas heating device, the coal gas dehydration device and the coal gas heating device are arranged in a front-back mode in the coal gas flowing direction, blast furnace coal gas containing mechanical water mist particles enters the coal gas heating device to be heated after being subjected to mechanical dehydration through the coal gas dehydration device, the heat transfer efficiency of the coal gas heater is improved, and the risks of dust blocking and corrosion of equipment are reduced. Through organic integration of the coal gas dehydration device and the coal gas heating device, deep dehydration of blast furnace coal gas entering the heating device is realized, the quality and heat value of the blast furnace coal gas and the heat exchange efficiency of equipment are improved, and the risks of ash blockage and corrosion of the equipment are reduced. Meanwhile, the coal gas heating device adopts a heat pipe heat exchanger type, so that the efficient heat exchange of flue gas and coal gas is realized, the sealing effect between cold and hot fluids is ensured, and the long service life and intrinsic safety of the equipment are realized.

Description

Technical Field

[0001] The utility model relates to the field of blast furnace gas dehydration and heat exchange, in particular to a blast furnace gas heater with a front dehydration device. Background Art

[0002] During the ironmaking process in the steel industry, blast furnace equipment produces a large amount of blast furnace gas, which enters the main pipe after dust removal and purification and is sent to downstream gas users. For thermal equipment such as blast furnace gas boilers and hot blast furnaces, gas heaters are generally used to effectively reduce the furnace exhaust temperature and achieve the purpose of improving the thermal efficiency of the blast furnace.

[0003] Due to the presence of mechanical water, the calorific value of blast furnace gas is reduced, and the thermal efficiency of the above industrial furnace is reduced. For gas heat exchangers, the evaporation and heat exchange of mechanical water in the gas loses the waste heat of the flue gas, reduces the heat exchange efficiency of the equipment, increases the degree of dust accumulation in the heat exchange tubes and the risk of ash blockage; in addition, due to the presence of S in the mechanical water of blast furnace gas, 2- 、SO3 2- 、SO4 2- , Cl - Corrosive components such as carbon monoxide and other substances accelerate the corrosion of gas pipelines and heat exchange equipment, increasing the risk of equipment failure and safety hazards.

[0004] Therefore, it is necessary to remove mechanical water and the corrosive components and dust contained in the mechanical water before blast furnace gas heat exchange, so as to improve the thermal efficiency of the heat exchanger, reduce the risk of ash blockage and corrosion of the equipment, and improve the inherent safety of the equipment. Utility Model Content

[0005] The utility model aims to solve the problem that blast furnace gas contains mechanical water, which easily causes ash blockage, corrosion and reduced heat exchange efficiency to gas heating equipment. A blast furnace gas heater with a pre-dehydration device is designed, which can effectively remove the mechanical water in the blast furnace gas before heat exchange, and at the same time remove the ash and corrosive components contained in the mechanical water, thereby ensuring the safe and stable operation of the gas heat exchanger and improving the heat transfer efficiency of the gas heater.

[0006] The technical solution of the utility model is:

[0007] A blast furnace gas heater with a pre-dehydration device is characterized in that it comprises a gas dehydration device and a gas heating device. The gas dehydration device and the gas heating device are arranged in front and behind each other in the gas flow direction. After the blast furnace gas containing mechanical water mist particles is mechanically dehydrated by the gas dehydration device, it enters the gas heating device for heating, thereby improving the heat transfer efficiency of the gas heater and reducing the risk of ash blockage and corrosion of the equipment.

[0008] The coal gas dehydration device comprises a dehydration device shell, a first-stage dehydration component, a second-stage dehydration component and a flushing device.

[0009] The dehydration device shell comprises a gas inlet, a dehydration body shell, and a dehydrator drain port.

[0010] The first-stage dehydration assembly is installed in the shell of the dehydration body, and is composed of a hookless baffle and a fixed rod. The hookless baffles are arranged in parallel at a certain distance and fixed by a fixed rod. When the blast furnace gas containing mechanical water mist particles flows through the parallel baffles at a certain speed, due to the inertial impact of the gas, the water mist particles collide with the baffles and are gathered into droplets, and the droplets gradually increase until the combined force of their own gravity and the pulling force of the gas flow is greater than the surface tension of the liquid, and the droplets flow down along the baffle surface to the drainage outlet at the bottom of the equipment. The multi-fold structure of the baffle increases the chance of the mist particles being captured, and the mist particles that are not removed are captured at the next turn through the same action. The first-stage dehydration assembly removes most of the mist particles first. At the same time, due to the use of hookless baffles, the gas flow resistance drop is small.

[0011] The second-stage dehydration assembly is installed in the dehydration body shell, located behind the first-stage dehydration assembly, and is composed of a hook-shaped baffle and a fixed rod. The hook-shaped baffles are arranged in parallel at a certain interval and fixed by the fixed rod. The function of the second-stage dehydration assembly is to capture and remove a small part of the mist particles that the first-stage dehydration assembly fails to remove. Due to the use of the hook-shaped baffle, the chances of liquid particles in the airflow being intercepted and captured are increased, thereby greatly improving the dehydration efficiency of the coal gas.

[0012] When the blast furnace gas flow passes through the first-stage dehydration assembly and the second-stage dehydration assembly, the moisture removed is discharged through the dehydrator drain port.

[0013] The flushing device includes a first flushing assembly, a second flushing assembly, and a third flushing assembly, which are respectively installed before the first-stage dehydration assembly, between the first-stage dehydration assembly and the second-stage dehydration assembly, and after the second-stage dehydration assembly, and are used to flush the first-stage dehydration assembly and the second-stage dehydration assembly when scaling affects the operation effect of the equipment, so as to restore the equipment performance. Each flushing assembly is composed of a flushing pipe and a flushing nozzle, wherein the second flushing assembly can flush the first-stage dehydration assembly and the second-stage dehydration assembly at the same time.

[0014] The gas heating device is installed after the front dehydration device. The dehydrated blast furnace gas enters the gas heating device to exchange heat with the flue gas. The gas heating device includes a heating device shell and a heat pipe.

[0015] The housing of the heating device comprises a gas connection section, a heating body housing, a gas outlet, a partition, a smoke inlet and a smoke outlet. The partition is used to separate and seal between blast furnace gas and smoke and to support the weight of the heat pipe.

[0016] The heat pipe is a high-efficiency heat exchange element. At least one independent heat pipe is installed in the shell of the heating body. The heat of the flue gas is continuously transferred to the blast furnace gas through the vaporization heat absorption and condensation heat release of the working fluid in the heat pipe.

[0017] Furthermore, the gas heating device may also adopt a split-type heat pipe heat exchanger. The utility model only introduces the integral-type heat pipe heat exchanger as an example.

[0018] The beneficial effects of the utility model are:

[0019] The utility model realizes deep dehydration of blast furnace gas entering the heating device through the organic integration of the gas dehydration device and the gas heating device, improves the quality and calorific value of the blast furnace gas and the heat exchange efficiency of the equipment, and reduces the risk of ash blockage and corrosion of the equipment. At the same time, the gas heating device adopts a heat pipe heat exchanger type, which not only realizes efficient heat exchange between flue gas and coal gas, but also ensures the sealing effect between cold and hot fluids, and realizes the long life use of the equipment and the intrinsic safety of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the general diagram of the utility model.

[0021] Figure 2 It is a schematic diagram of the front dehydration device of the utility model.

[0022] Figure 3 This is a schematic diagram of a gas heating device of the utility model.

[0023] Figure 4 for Figure 2 A-direction view.

[0024] Figure 5 for Figure 2 B view.

[0025] Figure 6 for Figure 4 CC cross-sectional view.

[0026] Figure 7 for Figure 5 DD cross-sectional view.

[0027] Figure 8 It is a schematic diagram of the flushing device of the utility model.

[0028] In the figure: 100, front dehydration device; 110, dehydration device shell; 111, gas inlet; 112, dehydration body shell; 113, dehydrator drain outlet; 120, first-stage dehydration component; 121, hook-free corrugated plate; 122, fixing rod; 130, second-stage dehydration component; 131, hook-type corrugated plate; 132, fixing rod; 140, flushing device; 141, first flushing component; 142, second flushing component; 143, third flushing component; 1401, flushing pipe; 1402, flushing nozzle; 200, gas heating device; 210, heating device shell; 211, gas connecting section; 212, heating body shell; 213, gas outlet; 214, partition; 215, flue gas inlet; 216, flue gas outlet; 220, heat pipe. DETAILED DESCRIPTION

[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0030] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of description, and are not used to limit the scope of implementation. The change or adjustment of their relative relationship should also be regarded as the scope of implementation of the utility model without substantial change of the technical content.

[0031] like Figure 1-8 shown.

[0032] See also Figure 1 A blast furnace gas heater with a pre-dehydration device is composed of a gas dehydration device 100 and a gas heating device 200. The gas dehydration device 100 and the gas heating device 200 are arranged in front and behind according to the gas flow direction. The blast furnace gas containing mechanical water mist particles is mechanically dehydrated by the gas dehydration device 100 and then enters the gas heating device 200 to exchange heat with the flue gas. Figure 1~2 , Figures 4 to 8The gas dehydration device 100 comprises a dehydration device housing 110, a first-stage dehydration assembly 120, a second-stage dehydration assembly 130 and a flushing device 140. The dehydration device housing 110 comprises a gas inlet 111, a dehydration body housing 112 and a dehydrator drain port 113. The first-stage dehydration assembly 120 and the second-stage dehydration assembly 130 are arranged in the dehydration device shell 110 front and back according to the gas flow direction; the first-stage dehydration assembly 120 is composed of a hook-less baffle 121 and a fixed rod 122, and the hook-less baffle 121 is arranged in parallel at a certain interval (for example, 25mm interval), and is fixed by the fixed rod 122; the second-stage dehydration assembly 130 is composed of a hook-shaped baffle 131 and a fixed rod 132, and the hook-shaped baffle 131 is arranged in parallel at a certain interval (for example, 25mm interval), and is fixed by the fixed rod 132; the first-stage dehydration assembly 120 removes most of the mist particles first, and at the same time, due to the use of the hook-less baffle 121, while meeting the dehydration effect, the resistance drop of the gas flowing through the dehydration assembly is reduced. The function of the second stage dehydration component 130 is to capture and remove a small portion of mist particles that cannot be removed by the first stage dehydration component 120. The use of the hook-shaped baffle 131 increases the chances of liquid particles in the airflow being intercepted and captured, thereby greatly improving the dehydration efficiency of the coal gas.

[0033] The water removed from the blast furnace gas by the first-stage dehydration assembly 120 and the second-stage dehydration assembly 130 is discharged through the dehydrator drain port 113 .

[0034] In the coal gas dehydration device 100, a flushing device 140 is also provided, including a first flushing assembly 141, a second flushing assembly 142, and a third flushing assembly 143, which are respectively installed before the first-stage dehydration assembly 120, between the first-stage dehydration assembly 120 and the second-stage dehydration assembly 130, and after the second-stage dehydration assembly 130, and are used to flush the first-stage dehydration assembly 120 and the second-stage dehydration assembly 130 when scaling affects the operation effect of the equipment, so as to restore the equipment performance. The first flushing assembly 141, the second flushing assembly 142, and the third flushing assembly 143 are respectively composed of a flushing pipe 1401 and a flushing nozzle 1402, wherein the second flushing assembly can flush the first-stage dehydration assembly and the second-stage dehydration assembly at the same time.

[0035] See also Figure 1 , Figure 3 The gas heating device 200 of the utility model is installed after the pre-dehydration device 100. The dehydrated blast furnace gas enters the gas heating device 200 to exchange heat with the flue gas, and includes a heating device shell 210 and a heat pipe 220.

[0036] The heating device housing 210 includes a gas connection section 211, a heating body housing 212, a gas outlet 213, a partition 214, a flue gas inlet 215, and a flue gas outlet 216. The partition 214 is used to separate and seal the blast furnace gas and the flue gas, and to support the weight of the heat pipe 220.

[0037] The heat pipes 220 , which are several independent heat pipes 220 , are installed in the heating body shell 212 . The heat of the flue gas is continuously transferred to the blast furnace gas through the vaporization heat absorption and condensation heat release of the working fluid in the heat pipes 220 .

[0038] In this embodiment, the gas heating device 200 is introduced only by taking the integral heat pipe heat exchanger type as an example. In actual application, the gas heating device can also adopt the split heat pipe heat exchanger type. Such change of heat pipe heat exchange junction type should fall within the protection scope of the present utility model.

[0039] The above embodiments are only preferred implementation modes of the present utility model. It should be pointed out that, for ordinary technicians in this technical field, several improvements and equivalent substitutions can be made without departing from the principles of the present utility model (for example, changes in the number of dehydration components, whether the baffle has a hook, etc.). These technical solutions after improvements and equivalent substitutions on the claims of the present utility model all fall within the protection scope of the present utility model.

[0040] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

Claims

1. A blast furnace gas heater with a pre-dehydration device, characterized in that: It includes a gas dehydration device and a gas heating device; the gas dehydration device and the gas heating device are arranged in front and behind each other according to the gas flow direction; the blast furnace gas containing mechanical water mist particles is mechanically dehydrated by the gas dehydration device and then enters the gas heating device for heating.

2. The blast furnace gas heater with a pre-dehydration device according to claim 1 is characterized in that: The coal gas dehydration device comprises a dehydration device shell, a first-stage dehydration component, a second-stage dehydration component and a flushing device.

3. The blast furnace gas heater with a pre-dehydration device according to claim 2 is characterized in that: The dehydration device shell comprises a gas inlet, a dehydration body shell and a dehydrator drain port.

4. The blast furnace gas heater with a pre-dehydration device according to claim 2 is characterized in that: The first-stage dehydration assembly is installed in the dehydration body shell, and is composed of hookless baffles and fixed rods. The hookless baffles are arranged in parallel at a set interval and fixed by the fixed rods.

5. The blast furnace gas heater with a pre-dehydration device according to claim 2 is characterized in that: The second-stage dehydration component is installed in the dehydration body shell, located behind the first-stage dehydration component, and consists of a hook-shaped baffle and a fixed rod. The hook-shaped baffles are arranged in parallel at a set interval and fixed by a fixed rod; the function of the second-stage dehydration component is to capture and remove a small part of the mist particles that the first-stage dehydration component cannot remove. Due to the use of the hook-shaped baffle, the chance of liquid particles in the airflow being intercepted and captured is increased, thereby greatly improving the dehydration efficiency of the coal gas; when the blast furnace coal gas flows through the first-stage dehydration component and the second-stage dehydration component, the moisture removed is discharged through the dehydrator drain outlet.

6. The blast furnace gas heater with a pre-dehydration device according to claim 2, characterized in that: The flushing device includes a first flushing component, a second flushing component, and a third flushing component, which are respectively installed before the first-stage dehydration component, between the first-stage dehydration component and the second-stage dehydration component, and after the second-stage dehydration component. They are used to flush the first-stage dehydration component and the second-stage dehydration component when scaling affects the operation effect of the equipment, so as to restore the equipment performance; each flushing component is composed of a flushing pipe and a flushing nozzle, among which the second-stage flushing component can flush the first-stage dehydration component and the second-stage dehydration component at the same time.

7. The blast furnace gas heater with a pre-dehydration device according to claim 1 is characterized in that: The gas heating device is installed after the gas dehydration device. The dehydrated blast furnace gas enters the gas heating device to exchange heat with the flue gas. The gas heating device includes a heating device shell and a heat pipe.

8. The blast furnace gas heater with a pre-dehydration device according to claim 7, characterized in that: The shell of the heating device includes a gas connection section, a heating body shell, a gas outlet, a partition, a flue gas inlet, and a flue gas outlet; the partition is used to separate and seal between blast furnace gas and flue gas, and to support the weight of the heat pipe; the heat pipe adopts at least one independent heat pipe installed in the heating body shell.

9. The blast furnace gas heater with a pre-dehydration device according to claim 1, characterized in that: The gas heating device adopts a split type heat pipe heat exchanger or an integral type heat pipe heat exchanger.

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