Waste heat utilization system of hydrogen chloride synthetic furnace

Abstract

The utility model provides a hydrogen chloride synthetic furnace waste heat utilization system, which relates to the technical field of waste heat utilization, and comprises a hydrogen chloride synthetic furnace, a steam decompression device, a hot water collection and output device group, a purification device group, a preheating device and a vinyl chloride converter, through the synergistic effect of the steam pressure reduction equipment, the hot water collection and output equipment group, the purification equipment group, the preheating equipment and the vinyl chloride converter, steam generated by the hydrogen chloride synthesis furnace is applied to the production process of vinyl chloride, so that effective utilization of waste heat can be realized, the requirement on external energy is reduced, the production cost of vinyl chloride is further reduced, and the production efficiency is improved. The energy utilization efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of waste heat utilization, and in particular to a waste heat utilization system of a hydrogen chloride synthesis furnace. Background Art

[0002] A hydrogen chloride synthesis furnace is a device used to synthesize hydrogen chloride gas. It typically uses combustion or other chemical reactions to react hydrogen and chlorine within the furnace to produce hydrogen chloride gas. The chemical reaction in the hydrogen chloride synthesis furnace releases a significant amount of heat, which raises the furnace temperature. To maintain a normal furnace temperature and protect the furnace equipment, a cooling system is required to remove excess heat. Water is typically used as the cooling medium. When heated to a certain temperature, the hot water converts to steam.

[0003] If this part of steam is discharged, it will cause waste heat. Therefore, it is necessary to propose a waste heat utilization system for a hydrogen chloride synthesis furnace to better utilize the waste heat of steam. Summary of the Invention

[0004] The purpose of the embodiments of the present application is to provide a hydrogen chloride synthesis furnace waste heat utilization system, which can achieve efficient recovery and utilization of the waste heat of the hydrogen chloride synthesis furnace, reduce the production cost of vinyl chloride, and improve energy utilization efficiency.

[0005] The present embodiment provides a system for utilizing waste heat from a hydrogen chloride synthesis furnace, comprising:

[0006] A hydrogen chloride synthesis furnace, which is used to react and generate hydrogen chloride gas, and generates steam when cooled by cooling water;

[0007] Steam decompression equipment, which is used to decompress the steam generated when the hydrogen chloride synthesis furnace is cooled, so as to separate the steam into vapor and liquid;

[0008] a hot water collection and output device group, the hot water collection and output device group being used to collect the hot water generated by the steam pressure reducing device and supply the hot water;

[0009] A purification equipment group, wherein the purification equipment group is used to purify the mixture of acetylene and hydrogen chloride;

[0010] A preheating device, wherein the preheating device is used to preheat the purified acetylene and hydrogen chloride gas mixture;

[0011] A vinyl chloride converter is provided, wherein the hot water undergoes a conversion reaction with the hot water supplied by the output device group and the preheated acetylene and hydrogen chloride mixed gas to produce vinyl chloride.

[0012] Furthermore, the steam pressure reducing device is a flash tank, and the air inlet of the flash tank is connected to the steam outlet of the hydrogen chloride synthesis furnace through a pipeline.

[0013] Furthermore, the hot water collection and output equipment group includes a hot water tank and a hot water pump. The hot water tank is connected to the flash tank through a pipeline, the hot water tank is connected to the hot water pump through a pipeline, and the hot water pump is connected to the preheating equipment and the vinyl chloride converter through a pipeline.

[0014] Furthermore, the purification equipment group includes a first graphite cooler, a first-level acid mist collector, a second graphite cooler and a second-level acid mist collector. The first graphite cooler, the first-level acid mist collector, the second graphite cooler and the second-level acid mist collector are connected in sequence through pipes. The second-level acid mist collector is connected to the preheating equipment through a pipe. The first graphite cooler is connected to an acetylene inlet pipe.

[0015] Furthermore, the acetylene inlet pipe is connected to the hydrogen chloride outlet of the hydrogen chloride synthesis furnace through a pipeline.

[0016] Furthermore, the preheating equipment and the vinyl chloride converter are connected to the hot water tank via pipelines.

[0017] Furthermore, the preheating equipment is a graphite preheater.

[0018] Beneficial effects of the utility model:

[0019] The utility model uses the synergistic effect of steam pressure reducing equipment, hot water collecting and outputting equipment group, purification equipment group, preheating equipment and vinyl chloride converter to apply the steam generated by the hydrogen chloride synthesis furnace to the vinyl chloride production process, thereby realizing the effective utilization of waste heat, reducing the demand for external energy, thereby reducing the production cost of vinyl chloride and improving energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A process system diagram in some embodiments of the present application;

[0022] The reference numerals are:

[0023] 1. Hydrogen chloride synthesis furnace; 2. Steam pressure reducing equipment; 3. Hot water collection and output equipment group; 31. Hot water tank; 32. Hot water pump; 4. Purification equipment group; 41. First graphite cooler; 42. First-stage acid mist collector; 43. Second graphite cooler; 44. Second-stage acid mist collector; 5. Preheating equipment; 6. Vinyl chloride converter. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0027] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of this application is typically placed when in use. These terms are intended only to facilitate the description of this application and simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0028] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0029] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances. Specific embodiment:

[0031] like Figure 1 As shown, the present application provides a waste heat utilization system for a hydrogen chloride synthesis furnace 1, comprising a hydrogen chloride synthesis furnace 1, a steam pressure reducing device 2, a hot water collecting and outputting device group 3, a purification device group 4, a preheating device 5, and a vinyl chloride converter 6. The hydrogen chloride synthesis furnace 1 is used to react and generate hydrogen chloride gas, and steam is generated when cooling with cooling water. The steam pressure reducing device 2 is used to reduce the pressure of the steam generated when the hydrogen chloride synthesis furnace 1 is cooled, so that the steam is separated into vapor and liquid. The hot water collecting and outputting device group 3 is used to collect the hot water generated by the steam pressure reducing device 2 and supply hot water. The purification device group 4 is used to treat the mixture of acetylene and hydrogen chloride. The gas is purified, the preheating device 5 is used to preheat the purified acetylene and hydrogen chloride mixed gas, and the vinyl chloride converter 6 causes the hot water to react with the hot water supplied by the output device group and the preheated acetylene and hydrogen chloride mixed gas to produce vinyl chloride. Through the synergistic effect of the steam pressure reducing device 2, the hot water collecting and outputting device group 3, the purification device group 4, the preheating device 5 and the vinyl chloride converter 6, the steam generated by the hydrogen chloride synthesis furnace 1 is used in the vinyl chloride production process, which can achieve effective utilization of waste heat, reduce the demand for external energy, thereby reducing the production cost of vinyl chloride and improving energy utilization efficiency.

[0032] like Figure 1 As shown, the steam pressure reducing device 2 is a flash tank, the air inlet of which is connected to the steam outlet of the hydrogen chloride synthesis furnace 1 through a pipeline. The steam pressure reducing device 2 can effectively reduce the pressure of the steam from the steam outlet of the hydrogen chloride synthesis furnace 1 to ensure that the steam pressure is within an appropriate range. Specifically, the high-pressure steam from the steam outlet of the hydrogen chloride synthesis furnace 1 is converted into 0.4 MPa steam, providing stable steam conditions for subsequent process links and ensuring the smooth progress of the entire production process.

[0033] like Figure 1As shown, the hot water collection and output equipment group 3 includes a hot water tank 31 and a hot water pump 32. The hot water tank 31 is connected to the flash tank through a pipeline, and the hot water tank 31 is connected to the hot water pump 32 through a pipeline. The hot water pump 32 is connected to the preheating equipment 5 and the vinyl chloride converter 6 through a pipeline. The hot water tank 31 is used to collect the hot water resources generated by the flash tank to provide a stable hot water supply for subsequent process links. Among them, the hot water pump 32 transports hot water from the hot water tank 31 to the preheating equipment 5, and uses the heat of the hot water to preheat the material entering the vinyl chloride converter 6, which can enable the material to reach the reaction temperature faster and reduce heating time and energy consumption.

[0034] like Figure 1 As shown, the purification equipment group 4 includes the first graphite cooler 41, the first-level acid mist trap 42, the second graphite cooler 43 and the second-level acid mist trap 44, the first graphite cooler 41, the first-level acid mist trap 42, the second graphite cooler 43 and the second-level acid mist trap 44 are connected in sequence by pipelines, and the second-level acid mist trap 44 is connected with the preheating device 5 by pipelines. The first graphite cooler 41 is connected with the acetylene inlet pipe, by the first graphite cooler 41, the second graphite cooler 43 and the first-level acid mist trap 42, the second-level acid mist trap 44 are connected in sequence, and multi-stage cooling and acid mist capture can be carried out to the gas containing impurities, effectively remove the impurities in the gas, improve the purity of the gas, and provide high-quality raw materials for subsequent process, wherein the graphite cooler is mainly used for cooling gas, and lowering the temperature can make some impurities condense or precipitate, and is convenient for subsequent capture, and the acid mist trap is then captured specifically for gaseous impurities such as acid mist, and it is guaranteed that the acidic components in the gas are effectively removed.

[0035] like Figure 1 As shown, the acetylene inlet pipe is connected to the hydrogen chloride outlet of the hydrogen chloride synthesis furnace 1 through a pipeline, so that the acetylene and the hydrogen chloride gas produced by the hydrogen chloride synthesis furnace 1 can be properly mixed and then enter the purification equipment group 4 together for purification.

[0036] like Figure 1 As shown, the preheating device 5 and the vinyl chloride converter 6 are connected to the hot water tank 31 through a pipeline. The preheating device 5 and the vinyl chloride converter 6 will generate a certain amount of steam during operation. The steam can be transported to the hot water tank 31 through the pipeline to heat the water, thereby increasing the temperature of the water and realizing the recovery and utilization of waste heat, improving the utilization efficiency of energy, and reducing the energy consumption in the production process.

[0037] like Figure 1 As shown, the preheating device 5 is a graphite preheater. Graphite has a very high thermal conductivity and can quickly transfer heat to the material flowing through the graphite preheater.

[0038] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A waste heat utilization system for a hydrogen chloride synthesis furnace, characterized in that: include: A hydrogen chloride synthesis furnace, which is used to react and generate hydrogen chloride gas, and generates steam when cooled by cooling water; Steam decompression equipment, which is used to decompress the steam generated when the hydrogen chloride synthesis furnace is cooled, so as to separate the steam into vapor and liquid; Hot water collection and output equipment group; the hot water collection and output equipment group is used to collect the hot water generated by the steam pressure reducing equipment and supply hot water; A purification equipment group, wherein the purification equipment group is used to purify the mixture of acetylene and hydrogen chloride; A preheating device, wherein the preheating device is used to preheat the purified acetylene and hydrogen chloride gas mixture; A vinyl chloride converter is provided, wherein the hot water undergoes a conversion reaction with the hot water supplied by the output device group and the preheated acetylene and hydrogen chloride mixed gas to produce vinyl chloride.

2. The waste heat utilization system of a hydrogen chloride synthesis furnace according to claim 1, characterized in that: The steam pressure reducing device is a flash tank, and the air inlet of the flash tank is connected to the steam outlet of the hydrogen chloride synthesis furnace through a pipeline.

3. The waste heat utilization system of a hydrogen chloride synthesis furnace according to claim 2, characterized in that: The hot water collection and output equipment group includes a hot water tank and a hot water pump. The hot water tank is connected to the flash tank through a pipeline. The hot water tank is connected to the hot water pump through a pipeline. The hot water pump is connected to the preheating equipment and the vinyl chloride converter through a pipeline.

4. A hydrogen chloride synthesis furnace waste heat utilization system according to claim 3, characterized in that: The purification equipment group includes a first graphite cooler, a first-level acid mist collector, a second graphite cooler and a second-level acid mist collector. The first graphite cooler, the first-level acid mist collector, the second graphite cooler and the second-level acid mist collector are sequentially connected through pipelines. The second-level acid mist collector is connected to the preheating equipment through a pipeline. The first graphite cooler is connected to an acetylene inlet pipe.

5. A hydrogen chloride synthesis furnace waste heat utilization system according to claim 4, characterized in that: The acetylene inlet pipe is connected to the hydrogen chloride outlet of the hydrogen chloride synthesis furnace through a pipeline.

6. A hydrogen chloride synthesis furnace waste heat utilization system according to claim 5, characterized in that: The preheating equipment and the vinyl chloride converter are connected to the hot water tank through pipelines.

7. A hydrogen chloride synthesis furnace waste heat utilization system according to claim 6, characterized in that: The preheating equipment is a graphite preheater.

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