Gas heating device

Abstract

The utility model provides a gas heating device which comprises a hot-blast stove and a dividing wall type heat exchanger, the hot-blast stove is connected to the dividing wall type heat exchanger through a smoke pipeline, the hot-blast stove is connected with heating raw materials, and a smoke outlet is formed in the lower portion of the dividing wall type heat exchanger. Flue gas below the dividing wall type heat exchanger is connected to a flue gas pipeline above the dividing wall type heat exchanger through an adjusting pipeline, an adjusting valve is arranged on the adjusting pipeline, a gas inlet and a gas outlet are formed in the dividing wall type heat exchanger, and a second purging connector is arranged on a pipeline of the gas inlet. The device has the beneficial effects that the stable and continuous supply of the gas heat carrier can be ensured, the operation is reduced, and the device parameters are stable; the device is small in occupied area, small in investment, high in safety coefficient and beneficial to large-scale production; the device can be used in all devices using gas heat carriers for heating.

Description

Technical Field

[0001] The utility model relates to the technical field of gas heating, in particular to a gas heating device. Background Art

[0002] At present, the existing heating system technology uses low calorific value gas (such as carbon black tail gas or blue charcoal gas) as the main fuel for heating, and the insufficient part is supplied by self-produced pyrolysis gas. The flue gas generated after combustion heats the heat storage material, and the heat storage material heats the gas. The heated gas enters the pyrolysis furnace to provide heat for pyrolysis. Every 2 pyrolysis furnaces are equipped with 4 heating furnaces. The heating furnace adopts the "two burning and two sending" system, two burning, two circulating, and the operating states of the heating furnaces are mutually converted to ensure the quality of the circulating gas and to ensure continuous production.

[0003] The existing technology uses a heat storage heating furnace, which switches between the two during operation. The combustion system must be re-ignited each time a switch is made. Especially when using low calorific value fuel gas, there is a safety hazard of failure to ignite and flashback. At the same time, the gas temperature fluctuates during each switching cycle, affecting the stable operation of the downstream pyrolysis device. The downstream device must be linked to make corresponding adjustments, which increases the difficulty of automation. There are corresponding safety hazards through manual adjustment. Utility Model Content

[0004] In order to overcome the above problems existing in the prior art, the utility model provides a gas heating device.

[0005] The utility model discloses a gas heating device, comprising a hot blast furnace and a partition type heat exchanger, wherein the hot blast furnace is connected to the partition type heat exchanger through a smoke pipe, the hot blast furnace is connected to heating raw materials, a smoke outlet is arranged below the partition type heat exchanger, the smoke below the partition type heat exchanger is connected to the smoke pipe above the partition type heat exchanger through a regulating pipe, a regulating valve is arranged on the regulating pipe, a gas inlet and a gas outlet are arranged on the partition type heat exchanger, and a purge interface 2 is arranged on the pipe of the gas inlet.

[0006] On this basis, the hot blast furnace is horizontal or vertical, and the partition wall heat exchanger is horizontal or vertical.

[0007] On this basis, the shell-side baffle of the partitioning heat exchanger is provided with at least one purge interface 1, and the purge medium is steam or high-pressure water.

[0008] On this basis, the flue gas temperature at the hot blast stove outlet ranges from 500 to 1200°C.

[0009] On this basis, the partition wall heat exchanger adopts an integral design or a segmented design. When it is an integral design, heat-resistant steel is used; when it is a segmented design, heat-resistant steel is used in the high-temperature section and ordinary steel plates are used in the low-temperature section.

[0010] On this basis, the tube side of the shell-and-tube heat exchanger can absorb the tube-side thermal stress by adopting a flexible tube sheet, a double-layer tube sheet or a single-tube expansion joint.

[0011] On this basis, the shell side of the shell-and-tube heat exchanger absorbs the shell-side thermal stress through an expansion joint.

[0012] On this basis, the gas heated by the gas heating device is ordinary gas or coal gas.

[0013] On this basis, the heating raw materials adopt high-calorific-value fuel, low-calorific-value fuel, fuel gas, self-produced coal gas or air.

[0014] On this basis, the gas heating device can be used in a vertical pyrolysis system or a horizontal pyrolysis system.

[0015] Compared with the prior art, the beneficial effects of the present utility model are as follows: A hot blast stove and a shell-and-tube heat exchanger are used for preheating coal gas. The externally supplied low-calorific-value gas (carbon black tail gas) is used as the main fuel, and the insufficient part is supplied by the self-produced pyrolysis coal gas. It burns as fuel in the hot blast stove. The high-temperature flue gas generated by combustion in the hot blast stove is adjusted to 1000-1300°C and enters the shell-and-tube heat exchanger. In the shell-and-tube heat exchanger, the hot flue gas exchanges heat with the circulating coal gas. The temperature of the flue gas after heat exchange is 250-350°C. Part of it is discharged, and the other part is connected to the flue gas pipeline above the shell-and-tube heat exchanger through a pipeline. After the flue gas temperature is reduced to 900-1100°C, it enters the shell-and-tube heat exchanger again, which can ensure the stable and continuous supply of coal gas, reduce operation, and the device parameters are stable; the device occupies a small area and has a small investment, and is conducive to the large-scale of the device at the same time; this device can be used in all devices using heat carrier heating. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the gas heating device of the present utility model;

[0017] Figure 2 is a schematic structural diagram of the shell-and-tube heat exchanger;

[0018] Figure 3 is a schematic structural diagram of the pyrolysis furnace coal gas circulation system of Embodiment 3 of the present utility model;

[0019] In the figure: 1. Hot blast stove, 2. Shell-and-tube heat exchanger, 3. Tube sheet, 4. Expansion joint, 5. Adjusting valve, 6. Purge interface one, 7. Flue gas outlet, 8. Coal gas purification device, 9. Dust removal and cooling device, 10. Purge interface two. Detailed Embodiments

[0020] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0021] The present utility model discloses a gas heating device, which includes a hot blast stove 1 and a shell-and-tube heat exchanger 2. The hot blast stove 1 is connected to the shell-and-tube heat exchanger 2 through a flue gas pipeline. The hot blast stove 1 is connected to heat the raw material, and the heating raw material is a high calorific value fuel, a low calorific value gas, self-produced coal gas or air at about 40°C; a flue gas outlet 7 is arranged below the shell-and-tube heat exchanger 2, and the flue gas below the shell-and-tube heat exchanger 2 is connected to the flue gas pipeline above the shell-and-tube heat exchanger 2 through a pipeline. A gas inlet and a gas outlet are arranged on the shell-and-tube heat exchanger 2. A purge interface II 10 is arranged on the pipeline of the gas inlet, and air or steam is used for purging for on-line or off-line cleaning. At least one purge interface I 6 is arranged on the shell-side baffle of the shell-and-tube heat exchanger 2, and the purge medium is steam or high-pressure water; the hot blast stove 1 can be horizontal or vertical, and the shell-and-tube heat exchanger 2 can be horizontal or vertical; the outlet flue gas temperature range of the hot blast stove 1 is 500 - 1200°C.

[0022] The shell-and-tube heat exchanger 2 adopts an integral design or a segmented design. When adopting an integral design, heat-resistant steel is used; when adopting a segmented design, heat-resistant steel is used for the high-temperature section and ordinary steel plates are used for the low-temperature section. The tube-side of the shell-and-tube heat exchanger 2 can absorb the tube-side thermal stress by adopting a flexible tube sheet, a double-layer tube sheet or a single-tube expansion joint. The shell-side of the shell-and-tube heat exchanger 2 absorbs the shell-side thermal stress through an expansion joint. The gas heated by the gas heating device is ordinary gas or coal gas.

[0023] Embodiment 1

[0024] Reference Figure 1 and Figure 2, in this embodiment, the case is that the gas is heated. During actual use, a hot blast stove 1 and a shell-and-tube heat exchanger 2 are used for preheating the gas. The externally supplied low-calorific-value gas (carbon black tail gas) at 40 °C is used as the main fuel, and the insufficient part is supplied by the pyrolysis gas produced by itself. It burns as fuel in the hot blast stove. The high-temperature flue gas generated by combustion in the hot blast stove 1 enters the shell-and-tube heat exchanger 2 after being temperature-adjusted to 1000 - 1300 °C. In the shell-and-tube heat exchanger 2, the hot flue gas exchanges heat with the circulating gas. The temperature of the flue gas after heat exchange is 250 - 350 °C. One part is discharged, and the other part is connected to the flue gas pipeline above the shell-and-tube heat exchanger 2 through an adjustment pipeline. An adjustment valve 5 is arranged on the adjustment pipeline to control and callback the flue gas volume, and the flue gas temperature is reduced to 500 - 1200 °C before entering the shell-and-tube heat exchanger 2 again. In this embodiment, the hot blast stove 1 is a vertical hot blast stove, and the shell-and-tube heat exchanger 2 is a vertical heat exchanger; the flue gas flows through the tube side and the gas flows through the shell side. Three purging interfaces 6 are arranged on the baffle of the shell side, and the purging medium is steam or high-pressure water. Compared with this, the flue gas temperature in the shell-and-tube heat exchanger 2 is high and the thermal stress is large. The flue gas flows through the tube side, and the tube ends of the tube side adopt a tube sheet 3 to absorb the thermal stress; in this embodiment, a self-made double tube sheet is adopted, the gas flows through the shell side, and there will be carbon deposition in the shell side where the gas flows through during the long-term operation of the shell-and-tube heat exchanger 2. It is purged and cleaned online by using air and steam. The high-temperature flue gas end is equipped with a double tube sheet. The tube sheet 3 mainly plays a sealing role, and the intermediate expansion joint 4 is mainly used for displacement absorption. At the same time, inert gas cooling is provided. The shell-and-tube heat exchanger 2 is provided with a gas inlet and a gas outlet. The gas at the outlet is connected to the pyrolysis furnace through a gas pipeline.

[0025] Embodiment 2

[0026] The difference from Embodiment 1 is that in the shell-and-tube heat exchanger 2, the gas flows through the tube side and the flue gas flows through the shell side. The gas flowing through the tube side can increase the gas flow velocity. This way can reduce carbon deposition and dust accumulation in the equipment and extend the equipment maintenance time.

[0027] Embodiment 3

[0028] This gas heating device can be used in a vertical pyrolysis system or a horizontal pyrolysis system. This embodiment provides a pyrolysis furnace gas circulation system equipped with this heating device. Refer to Figure 3 , the pyrolysis furnace includes a drying section, a carbonization section and a cooling section. The gas in the drying section enters the dust removal and cooling device 9 through a pipeline. The dust removal and cooling device 9 is connected to the gas heating device. A part enters the gas heating device, and the remaining part enters the cooling section 4. The gas heating device is connected to the carbonization section through a pipeline. The moisture in the coal in the drying section is carried away by the gas, and then after dust removal, cooling and reuse. The removal of the total water not only reduces the load of subsequent wastewater treatment, but also the cooling water can be reused.

[0029] The partition heat exchanger 2 is connected to the dry distillation section. The gas in the dry distillation section is connected to the gas purification device 8 through a pipeline. The gas purification device 8 is respectively connected to the hot blast stove 1 and the cooling section through pipelines. The self-produced gas is heated by the gas heating device. After the hot gas at 700-900°C is evenly distributed in the dry distillation section, it provides a heat source for the raw coal for pyrolysis. The gas and the high-temperature oil and gas generated by pyrolysis jointly enter the gas purification device 10. The temperature of the gas entering the gas purification device 10 is 100-250°C. Part of the purified gas is sent out, and part is returned to the furnace as a heat carrier. Using this heating device can ensure the stable and continuous supply of the heat carrier to the pyrolysis furnace, reduce operation, and the device parameters are stable, thus ensuring product quality; the device occupies a small area, has a small investment, and a high safety factor.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inner", "front", "center", "both ends", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "set", "connected", "fixed", "swivel-connected", "padded", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications, and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the technology or knowledge in related fields. And the changes and modifications made by those skilled in the art that do not depart from the spirit and scope of the present invention should all be within the protection scope of the appended claims of the present invention.

Claims

1. A gas heating device, characterized in that: The invention comprises a hot blast furnace (1) and a partition-type heat exchanger (2), wherein the hot blast furnace (1) is connected to the partition-type heat exchanger (2) via a flue gas duct, the hot blast furnace (1) is connected to heating raw materials, a flue gas outlet (7) is arranged below the partition-type heat exchanger (2), the flue gas below the partition-type heat exchanger (2) is connected to the flue gas duct above the partition-type heat exchanger (2) via a regulating duct, a regulating valve (5) is arranged on the regulating duct, a gas inlet and a gas outlet are arranged on the gas inlet duct, and a purge interface 2 (10) is arranged on the gas inlet duct.

2. The gas heating device according to claim 1, characterized in that: The hot air furnace (1) is of horizontal or vertical type, and the partition wall heat exchanger (2) is of horizontal or vertical type.

3. The gas heating device according to claim 1, characterized in that: The shell-side baffle of the partitioning heat exchanger (2) is provided with at least one purge interface (6), and the purge medium is steam or high-pressure water.

4. The gas heating device according to claim 1, characterized in that: The temperature of the flue gas at the outlet of the hot blast furnace (1) is in the range of 500 to 1200°C.

5. The gas heating device according to claim 1, characterized in that: The partition-type heat exchanger (2) adopts an integral design or a segmented design. When the integral design is adopted, heat-resistant steel is adopted; when the segmented design is adopted, the high-temperature section adopts heat-resistant steel, and the low-temperature section adopts ordinary steel plate.

6. The gas heating device according to claim 1, characterized in that: The tube side of the partition wall heat exchanger (2) can absorb the thermal stress of the tube side by adopting a flexible tube sheet, a double-layer tube sheet or a single tube expansion joint.

7. The gas heating device according to claim 1, characterized in that: The shell side of the partitioning heat exchanger (2) absorbs the shell side thermal stress through an expansion joint.

8. The gas heating device according to claim 1, characterized in that: The gas heated by the gas heating device is ordinary gas or coal gas.

9. The gas heating device according to claim 1, characterized in that: The heating raw material is high calorific value fuel, low calorific value fuel, fuel gas, self-produced coal gas or air.

10. The gas heating device according to claim 1, characterized in that: The gas heating device can be used in a vertical pyrolysis system or a horizontal pyrolysis system.

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