Heat energy and steam recovery system of hydrogen chloride synthesis furnace

Abstract

The utility model discloses a heat energy and steam recovery system of a hydrogen chloride synthetic furnace, which comprises the hydrogen chloride synthetic furnace, a low-pressure steam flash tank and a medium-pressure steam flash tank, a jacket is arranged on the furnace wall of the hydrogen chloride synthetic furnace, and the hydrogen chloride synthetic furnace is provided with four sections, the hydrogen chloride synthesis furnace sequentially comprises a hydrogen chloride synthesis section, a byproduct medium-pressure steam section, a sensible heat recovery section and a cooling section from bottom to top, and a heat transfer reinforced turbulator is mounted in the hydrogen chloride synthesis furnace; a low-pressure steam pipeline, a first hot water conveying pipeline and a hot water backflow pipeline are arranged on the low-pressure steam flash tank, the low-pressure steam pipeline is connected with a steam ejector used for converting low-pressure steam pressure into medium-pressure steam pressure, and a medium-pressure steam pipeline and a second hot water conveying pipeline are arranged at the top of the medium-pressure steam flash tank. By arranging the low-pressure steam flash tank and the steam ejector, low-pressure steam is converted into medium-pressure steam for downstream users, and heat energy is recycled to the maximum extent; and a heat transfer reinforcing turbulator is added, so that the heat utilization efficiency is effectively enhanced.

Description

Technical Field

[0001] The utility model relates to a heat recovery device, in particular to a heat energy and steam recovery system of a hydrogen chloride synthesis furnace. Background Art

[0002] Hydrogen chloride synthesis furnace is used to burn chlorine and hydrogen to produce hydrogen chloride gas. Existing hydrogen chloride synthesis furnaces generally produce a single by-product of low-pressure steam or medium-pressure steam, among which the synthesis furnace that produces low-pressure steam is a two-stage type. Although this type of furnace that produces low-pressure steam as a by-product can obtain more steam than the synthesis furnace that produces medium-pressure steam as a by-product, it has fewer usage scenarios and a low thermal energy utilization rate.

[0003] The hydrogen chloride that passes through the combustion section in the hydrogen chloride synthesis furnace, that is, the HCL gas temperature is relatively high when the gas enters the cooling section of the synthesis furnace. A large amount of cooling water is still required to cool the HCL gas to 65°C in the cooling section of the synthesis furnace. Not only can part of the heat energy not be effectively utilized, but also a large amount of cooling water is consumed. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a heat energy and steam recovery system for a hydrogen chloride synthesis furnace with reasonable design, high steam recovery efficiency and saving of circulating cooling water in view of the deficiencies of the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A heat energy and steam recovery system for a hydrogen chloride synthesis furnace, characterized in that the system comprises a hydrogen chloride synthesis furnace, a low-pressure steam flash tank and a medium-pressure steam flash tank, a hydrogen and chlorine gas inlet is arranged at the bottom of the hydrogen chloride synthesis furnace, and a hydrogen chloride gas outlet is arranged at the top of the hydrogen chloride synthesis furnace;

[0007] A jacket is provided on the furnace wall of the hydrogen chloride synthesis furnace. The hydrogen chloride synthesis furnace is provided with four sections, which are a hydrogen chloride synthesis section, a by-product medium-pressure steam section, a sensible heat recovery section, and a cooling section from bottom to top. The jacket of the hydrogen chloride synthesis section is connected to the jacket of the sensible heat recovery section through a connecting pipe. A heat transfer enhancing turbulator is installed in the hydrogen chloride synthesis furnace of the by-product medium-pressure steam section. A circulating water inlet pipe is provided in the jacket at the bottom of the cooling section, and a circulating water outlet pipe is provided in the jacket at the top of the cooling section.

[0008] A low-pressure steam pipeline is provided on the top of the low-pressure steam flash tank, and a steam ejector for converting the low-pressure steam pressure into medium-pressure steam is connected to the low-pressure steam pipeline. The inlet of the steam ejector is connected to the high-pressure steam pipeline, and the steam at the outlet of the steam ejector is used for production needs. A first hot water delivery pipeline communicating with the jacket of the hydrogen chloride synthesis section is provided at the bottom of the low-pressure steam flash tank, and a first forced circulation pump is installed on the first hot water delivery pipeline. A hot water reflux pipeline communicating with the jacket of the sensible heat recovery section is provided on one side of the low-pressure steam valve tank.

[0009] A medium-pressure steam pipeline for production needs is provided on the top of the medium-pressure steam flash tank, and a second hot water delivery pipeline communicating with the jacket of the by-product medium-pressure steam section is provided at the bottom of the medium-pressure steam flash tank, and a second forced circulation pump is installed on the second hot water delivery pipeline.

[0010] The technical problem to be solved by the utility model can also be achieved through the following technical solution: the air inlet at the bottom of the hydrogen chloride synthesis furnace is respectively connected to a hydrogen pipeline and a chlorine pipeline through a tee.

[0011] The technical problem to be solved by the utility model can also be achieved through the following technical solution: graphite block holes are installed in the hydrogen chloride synthesis section, the upper section of the by-product medium-pressure steam section, the sensible heat recovery section, and the cooling section.

[0012] The technical problem to be solved by the utility model can also be achieved through the following technical solution: a water supply pipeline is connected to one side of the low-pressure steam flash tank and the medium-pressure steam flash tank.

[0013] Compared with the prior art, the utility model provides a low-pressure steam flash tank and a steam ejector, and innovatively uses the effect of low-pressure through high-pressure steam ejection to obtain medium-pressure steam, which is combined with the medium-pressure steam produced as a byproduct of the synthesis furnace for downstream users to recover heat energy to the greatest extent; a heat transfer enhancing turbulator is added in the synthesis furnace to effectively enhance the heat utilization efficiency. The heat energy and steam recovery system of the hydrogen chloride synthesis furnace described in the utility model not only greatly improves the recovery of heat energy, but also effectively reduces the HCL gas temperature in the cooling section of the synthesis furnace, saving the amount of circulating cooling water. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a structural diagram of the heat energy and steam recovery system of the hydrogen chloride synthesis furnace described in the utility model.

[0015] In the figure: 1-high-pressure steam pipeline, 2-water supply pipeline, 3-hydrogen pipeline, 4-chlorine pipeline, 5-circulating water inlet pipeline, 6-hot water reflux pipeline, 7-circulating water outlet pipeline, 8-hydrogen chloride outlet, 9-steam ejector, 10-low-pressure steam flash tank, 11-first hot water delivery pipeline, 12-medium-pressure steam flash tank, 13-second hot water delivery pipeline, 14-first forced circulation pump, 15-second forced circulation pump, 16-hydrogen chloride synthesis section, 17-connecting pipeline, 18-heat transfer enhanced turbulator, 19-by-product medium-pressure steam section, 20-sensible heat recovery section, 21-graphite block, 22-cooling section. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0017] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0018] Reference Figure 1 , a heat energy and steam recovery system for a hydrogen chloride synthesis furnace, the system comprising a hydrogen chloride synthesis furnace, a low-pressure steam flash tank 10 and a medium-pressure steam flash tank 12, a hydrogen and chlorine gas inlet is provided at the bottom of the hydrogen chloride synthesis furnace, and a hydrogen chloride gas outlet is provided at the top of the hydrogen chloride synthesis furnace;

[0019] A jacket is provided on the furnace wall of the hydrogen chloride synthesis furnace. The hydrogen chloride synthesis furnace is provided with four sections, which are, from bottom to top, a hydrogen chloride synthesis section 16, a byproduct medium-pressure steam section 19, a sensible heat recovery section 20, and a cooling section 22. The jackets of the above four sections are separated by a separator ring, which may be an O-ring. The jacket of the hydrogen chloride synthesis section 16 is connected to the jacket of the sensible heat recovery section 20 through a connecting pipe 17. A heat transfer enhancing turbulator 18 is installed in the hydrogen chloride synthesis furnace of the byproduct medium-pressure steam section 19. The heat transfer enhancing turbulator 18 can be installed in the hydrogen chloride synthesis furnace through a support frame or any fixed bracket disclosed in the prior art. A circulating water inlet pipe 5 is provided in the jacket at the lower part of the cooling section 22, and a circulating water outlet pipe 7 is provided in the jacket at the upper part of the cooling section 22.

[0020] A low-pressure steam pipeline is provided on the top of the low-pressure steam flash tank 10, and a steam ejector 9 for converting the low-pressure steam pressure into medium-pressure steam is connected to the low-pressure steam pipeline. The inlet of the steam ejector 9 is connected to the high-pressure steam pipeline 1, and the steam at the outlet of the steam ejector 9 is used for production needs. A first hot water delivery pipeline 11 communicating with the jacket of the hydrogen chloride synthesis section 16 is provided at the bottom of the low-pressure steam flash tank 10, and a first forced circulation pump 14 is installed on the first hot water delivery pipeline 11. A hot water reflux pipeline 6 communicating with the jacket of the sensible heat recovery section 20 is provided on one side of the low-pressure steam flash tank 10.

[0021] A medium-pressure steam pipeline for production needs is provided at the top of the medium-pressure steam flash tank 12, and a second hot water delivery pipeline 13 communicating with the jacket of the by-product medium-pressure steam section 19 is provided at the bottom of the medium-pressure steam flash tank 12. A second forced circulation pump 15 is installed on the second hot water delivery pipeline 13.

[0022] The air inlet at the bottom of the hydrogen chloride synthesis furnace is respectively connected to a hydrogen pipeline 3 and a chlorine pipeline 4 through a tee.

[0023] Graphite blocks 21 are installed in the upper section of the by-product medium-pressure steam section 19 , the sensible heat recovery section 20 , and the cooling section 22 .

[0024] A water supply pipeline 2 is connected to one side of the low-pressure steam flash tank 10 and the medium-pressure steam flash tank 12 .

[0025] The working process of the heat energy and steam recovery system of the hydrogen chloride synthesis furnace of the utility model is as follows:

[0026] Hydrogen 3 and chlorine 4 are burned in the synthesis section 16 of the hydrogen chloride synthesis furnace to produce hydrogen chloride gas. Since the heat here is mainly the heat radiation generated by the combustion, the hot water in the low-pressure flash tank 10 is transported to the jacket of the hydrogen chloride synthesis section 16 through the first forced circulation pump 14 through the first hot water delivery pipeline 11 to take away the heat radiated during the combustion. At the same time, the hot water is further transported to the sensible heat recovery section 20 through the connecting pipeline 17 to recover the sensible heat of the high-temperature hydrogen chloride after the by-product medium-pressure steam. At this time, the superheated water is transported to the low-pressure steam flash tank 10 through the hot water reflux pipeline for flash evaporation to recover the low-pressure steam. Since the low-pressure steam is rarely used in the production process, the negative pressure is generated by the high-pressure steam 1 after passing through the steam ejector 9, which is more conducive to the low-pressure flash tank flashing out more steam. At the same time, the low-pressure steam and the high-pressure steam are mixed to obtain medium-pressure steam. The medium-pressure steam has the same steam pressure as the by-product medium-pressure steam 19, and is combined for production needs.

[0027] The large amount of heat released by the byproduct medium-pressure steam section 19 during the combustion of hydrogen chloride is transported to the jacket of the combustion section 19 by the high-temperature hot water in the medium-pressure steam flash tank 12 through the second hot water delivery pipeline 13 and the second forced circulation pump 15 to take away the heat generated by the combustion. At the same time, the high-temperature hot water is heated to superheated high-temperature water and flashes in the medium-pressure steam flash tank 12 to obtain medium-pressure steam;

[0028] The heat generated by combustion is taken away by the high-temperature hot water on the furnace wall. Since the temperature of the hydrogen chloride gas at this time is as high as about 2000°C, after the high-temperature hydrogen chloride gas flows through the heat transfer enhancement turbulator 18, the high-temperature hydrogen chloride is compressed and flows upward along the furnace wall. Since the hydrogen chloride gas is compressed, its flow rate increases, so that the flow mode of hydrogen chloride in the furnace changes from laminar flow to turbulent flow, which greatly enhances the heat transfer efficiency;

[0029] After passing through the heat transfer enhanced turbulent device, the hydrogen chloride flows through the byproduct medium-pressure steam section graphite block 21. After the high-temperature hot water enters the graphite block 21, it is further heated to become high-temperature superheated water, and the hydrogen chloride gas is further cooled and enters the hydrogen chloride sensible heat recovery section 20. The hot water is further heated to obtain superheated water, and the hydrogen chloride gas is further cooled, thereby taking away more sensible heat of the hydrogen chloride gas and reducing the amount of circulating cooling water. At this time, the heat of the hydrogen chloride gas is relatively low, and the circulating water 5 and the circulating water return water 7 are cooled in the cooling section 22. The temperature of the hydrogen chloride gas after cooling is lower than 65°C.

[0030] The heat energy and steam recovery system of the hydrogen chloride synthesis furnace of the utility model effectively recovers heat by developing a four-stage synthesis furnace with a heat transfer enhanced turbulent device, and innovatively adopts a steam jet mixing method to mix steam of different pressures and transport it to downstream users together with the by-product medium-pressure steam. While greatly recovering heat energy, it reduces the temperature of hydrogen chloride gas in the cooling section of the synthesis furnace and saves circulating cooling water. Therefore, the heat energy and steam recovery system of the utility model not only greatly improves the recovery of heat energy, but also effectively reduces the temperature of HCL gas in the cooling section of the synthesis furnace, saving the amount of circulating cooling water.

[0031] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A heat energy and steam recovery system for a hydrogen chloride synthesis furnace, characterized in that: The system comprises a hydrogen chloride synthesis furnace, a low-pressure steam flash tank and a medium-pressure steam flash tank. The bottom of the hydrogen chloride synthesis furnace is provided with hydrogen and chlorine gas inlets, and the top of the hydrogen chloride synthesis furnace is provided with a hydrogen chloride gas outlet. A jacket is provided on the furnace wall of the hydrogen chloride synthesis furnace. The hydrogen chloride synthesis furnace is provided with four sections, which are a hydrogen chloride synthesis section, a by-product medium-pressure steam section, a sensible heat recovery section, and a cooling section from bottom to top. The jacket of the hydrogen chloride synthesis section is connected to the jacket of the sensible heat recovery section through a connecting pipe. A heat transfer enhancing turbulator is installed in the hydrogen chloride synthesis furnace of the by-product medium-pressure steam section. A circulating water inlet pipe is provided in the jacket at the bottom of the cooling section, and a circulating water outlet pipe is provided in the jacket at the top of the cooling section. A low-pressure steam pipeline is provided on the top of the low-pressure steam flash tank, and a steam ejector for converting the low-pressure steam pressure into medium-pressure steam is connected to the low-pressure steam pipeline. The inlet of the steam ejector is connected to the high-pressure steam pipeline, and the steam at the outlet of the steam ejector is used for production needs. A first hot water delivery pipeline communicating with the jacket of the hydrogen chloride synthesis section is provided at the bottom of the low-pressure steam flash tank, and a first forced circulation pump is installed on the first hot water delivery pipeline. A hot water reflux pipeline communicating with the jacket of the sensible heat recovery section is provided on one side of the low-pressure steam valve tank. A medium-pressure steam pipeline for production needs is provided on the top of the medium-pressure steam flash tank, and a second hot water delivery pipeline communicating with the jacket of the by-product medium-pressure steam section is provided at the bottom of the medium-pressure steam flash tank, and a second forced circulation pump is installed on the second hot water delivery pipeline.

2. A heat energy and steam recovery system for a hydrogen chloride synthesis furnace according to claim 1, characterized in that: The air inlet at the bottom of the hydrogen chloride synthesis furnace is respectively connected with a hydrogen pipeline and a chlorine pipeline through a tee.

3. A heat energy and steam recovery system for a hydrogen chloride synthesis furnace according to claim 1, characterized in that: Graphite blocks are installed in the upper section of the by-product medium-pressure steam section, the sensible heat recovery section, and the cooling section.

4. A heat energy and steam recovery system for a hydrogen chloride synthesis furnace according to claim 1, characterized in that: One side of the low-pressure steam flash tank and the medium-pressure steam flash tank are both connected with a water supply pipeline.

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