A hydrogen chloride synthesis system with high by-product 1.0MpaG steam

Abstract

The present invention relates to the technical field of hydrogen chloride synthesis, and specifically discloses a hydrogen chloride synthesis system with a high by-product of 1.0 MpaG steam, comprising a synthesis furnace, and a high-pressure steam output unit, a low-pressure steam output unit, and a waste steam treatment unit respectively connected to the synthesis furnace, wherein the waste steam treatment unit is connected to the low-pressure steam output unit; the synthesis furnace is provided with a synthesis section, a steam circulation section, and a cooling section from bottom to top, and all three sections are composed of a graphite cylinder and a steel shell sleeved outside the cylinder, and the steam circulation section is provided with a high-pressure vapor-liquid outlet and a hot water reflux inlet. In the synthesis system of the present invention, the waste steam of the off-site low-pressure steam collection system is pumped into a hot water circulation tank by a low-pressure steam water pump, and is recycled by the hot water circulation tank, thereby increasing the production capacity of the by-product; the increase in the feed water temperature not only fully utilizes the waste heat and increases the amount of by-product high and low-pressure steam, but also enables the feed water to deoxygenate, thereby extending the service life of the by-product steam jacket.

Description

Technical Field

[0001] The invention belongs to the technical field of hydrogen chloride synthesis, and in particular is a hydrogen chloride synthesis system with high by-product 1.0 MpaG steam. Background Art

[0002] Hydrogen chloride synthesis utilizes a two-in-one furnace that produces low-pressure steam as a byproduct. The combustion of chlorine and hydrogen releases a significant amount of reaction heat, with the core flame temperature reaching over 2500°C and the resulting hydrogen chloride gas temperature exceeding 2000°C. This means that approximately 605 kcal of heat is released for every kilogram of gaseous hydrogen chloride synthesized. Minimizing byproduct losses during the synthesis process is paramount in the synthesis system. Therefore, recycling waste steam from the reactor has become a consideration, leading to the urgent need for a hydrogen chloride synthesis system that produces a high byproduct of 1.0 MPaG steam. Summary of the Invention

[0003] The purpose of the present invention is to provide a hydrogen chloride synthesis system with high by-product 1.0 MPaG steam, which solves the above-mentioned problems.

[0004] To solve the above technical problems, the present invention provides a hydrogen chloride synthesis system with a high by-product of 1.0 MPaG steam, comprising a synthesis furnace, and a high-pressure steam production unit, a low-pressure steam production unit, and a waste steam treatment unit respectively connected to the synthesis furnace; the synthesis furnace is provided with a synthesis section, a steam circulation section, and a cooling section from bottom to top, each of which is composed of a graphite cylinder and a steel shell sleeved outside the cylinder; the steam circulation section is provided with a high-pressure vapor-liquid outlet, a hot water reflux inlet, a circulating pure water inlet 1, a circulating pure water inlet 2, and a circulating pure water outlet; the cooling section is provided with a pure water inlet, a low-pressure vapor-liquid outlet, a vapor-liquid inlet, and a filtered water outlet;

[0005] The high-pressure steam production unit includes a first flash tank, a high-pressure vapor-liquid inlet on the left side of the first flash tank is connected to the high-pressure vapor-liquid outlet of the synthesis furnace, a hot water outlet at the lower right side of the first flash tank is connected to the hot water reflux inlet of the synthesis furnace, and a steam outlet at the upper portion of the first flash tank is connected to a first steam main;

[0006] The low-pressure steam production unit includes a second flash tank and a high-pressure water feed pump, the low-pressure vapor-liquid inlet on the left side of the second flash tank is connected to the low-pressure vapor-liquid outlet of the synthesis furnace, the steam outlet at the top of the second flash tank is connected to a second steam main pipe, the vapor-liquid outlet at the bottom of the second flash tank is connected to the vapor-liquid inlet of the synthesis furnace, the water outlet of the high-pressure water feed pump is connected to the water inlet on the upper right side of the second flash tank, and the water outlet on the lower right side of the second flash tank is connected to the high-pressure water feed pump;

[0007] The waste steam treatment unit includes a low-pressure steam water pump, a hot water circulation tank and a hot water circulation pump group. The air inlet on the right side of the low-pressure steam water pump is connected to an off-site low-pressure steam collection system. The vapor-liquid outlet at the bottom of the low-pressure steam water pump is connected to the vapor-liquid inlet on the right side of the top of the hot water circulation tank. The filtered water inlet at the top of the low-pressure steam water pump is connected to the filtered water outlet of the synthesis furnace. The desalted water inlet on the right side of the hot water circulation tank is connected to a desalted water storage system. The hot water outlet at the bottom of the hot water circulation tank is connected to the hot water circulation pump group. A forced circulation water pump is provided between the second flash tank and the synthesis furnace. The hot water circulation pump group includes a first hot water circulation pump and a second hot water circulation pump. The water outlet of the first hot water circulation pump is connected to the circulating pure water inlet of the synthesis furnace, and the water outlet of the second hot water circulation pump is connected to the pipeline between the second flash tank and the forced circulation water pump.

[0008] Furthermore, the steam outlet in the middle of the top of the hot water circulation tank is connected to a steam outlet pipe.

[0009] Furthermore, the sewage outlet at the bottom of the first flash tank is connected to a sewage pipe, and a sewage sampling cooler is provided at the end of the sewage pipe.

[0010] Furthermore, the bottom of the synthesis furnace is provided with an acid discharge port, and the upper part is provided with a condensed acid discharge port. The acid discharge port is communicated with the condensed acid discharge port and is connected to the sewage sampling cooler.

[0011] Furthermore, a jacket drain port is provided at the bottom of the synthesis furnace.

[0012] The beneficial effects of the present invention are as follows: the synthesis system of the present invention allows the gas formed by the combustion of hydrogen and chlorine fuels to enter the synthesis furnace through a pipeline, and separates the gas and liquid through the first flash tank and the second flash tank, thereby achieving a high utilization rate of the synthesis system; the waste steam of the off-site low-pressure steam collection system is pumped into the hot water circulation tank through the low-pressure steam water pump, and is circulated through the hot water circulation tank, thereby increasing the production capacity of the by-product; the increase in the feed water temperature fully utilizes the waste heat and increases the amount of by-product high and low-pressure steam, while allowing the feed water to play a role in deoxygenation, thereby extending the service life of the by-product steam jacket. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a structural diagram of a hydrogen chloride synthesis system with high by-product 1.0MpaG steam;

[0015] Figure 2 This is the overall structure diagram of the synthesis furnace of the hydrogen chloride synthesis system with high by-product 1.0MpaG steam;

[0016] In the figure: 1-synthesis furnace, 2-high-pressure vapor-liquid outlet, 3-hot water reflux inlet, 4-circulating pure water inlet 1, 5-circulating pure water inlet 2, 6-circulating pure water outlet, 7-pure water inlet, 8-low-pressure vapor-liquid outlet, 9-vapor-liquid inlet, 10-filtered water outlet, 11-first flash tank, 12-first steam main, 13-second flash tank, 14-high-pressure feed water pump, 15-second steam main, 16-low-pressure steam water pump, 17-hot water circulation tank, 18-hot water circulation pump group, 19-out-of-boundary low-pressure steam collection system, 20-desalted water storage system, 21-forced circulation water pump, 22-steam outlet pipe, 23-sewage pipe, 24-sewage sampling cooler, 25-acid discharge port, 26-condensed acid discharge port, 27-jacket drain port, 181-first hot water circulation pump, 182-second hot water circulation pump. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the present specification. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0018] In a specific embodiment of the present invention, Figure 1-Figure 2 As shown, a hydrogen chloride synthesis system with a high by-product of 1.0MpaG steam is specifically disclosed, comprising a synthesis furnace 1, and a high-pressure steam output unit, a low-pressure steam output unit and a waste steam treatment unit respectively connected to the synthesis furnace 1; the synthesis furnace 1 is provided with a synthesis section, a steam circulation section and a cooling section from bottom to top, and the three sections are all composed of a graphite cylinder and a steel shell sleeved outside the cylinder, the steam circulation section is provided with a high-pressure vapor-liquid outlet 2, a hot water reflux inlet 3, a circulating pure water inlet 1 4, a circulating pure water inlet 2 5 and a circulating pure water outlet 6; the cooling section is provided with a pure water inlet 7, a low-pressure vapor-liquid outlet 8, a vapor-liquid inlet 9 and a filtered water outlet 10, a jacket drain port 27 is provided at the bottom of the synthesis furnace 1, an acid discharge port 25 is provided at the bottom of the synthesis furnace 1, and a condensed acid discharge port 26 is provided at the upper part, the acid discharge port 25 is communicated with the condensed acid discharge port 26, and is connected to the sewage sampling cooler 24.

[0019] The high-pressure steam output unit includes a first flash tank 11. The high-pressure vapor-liquid inlet on the left side of the first flash tank 11 is connected to the high-pressure vapor-liquid outlet 2 of the synthesis furnace 1. The hot water outlet at the lower right side of the first flash tank 11 is connected to the hot water reflux inlet 3 of the synthesis furnace 1. The steam outlet at the upper part of the first flash tank 11 is connected to the first steam main pipe 12; the sewage outlet at the bottom of the first flash tank 11 is connected to the sewage pipe 23, and a sewage sampling cooler 24 is provided at the end of the sewage pipe 23.

[0020] The low-pressure steam production unit includes a second flash tank 13 and a high-pressure water feed pump 14. The low-pressure vapor-liquid inlet on the left side of the second flash tank 13 is connected to the low-pressure vapor-liquid outlet 8 of the synthesis furnace 1. The steam outlet at the top of the second flash tank 13 is connected to the second steam main pipe 15. The vapor-liquid outlet at the bottom of the second flash tank 13 is connected to the vapor-liquid inlet 9 of the synthesis furnace 1. The water outlet of the high-pressure water feed pump 14 is connected to the water inlet on the upper right side of the second flash tank 13, and the water outlet on the lower right side of the second flash tank 13 is connected to the high-pressure water feed pump 14.

[0021] The waste steam treatment unit includes a low-pressure steam water pump 16, a hot water circulation tank 17 and a hot water circulation pump group 18. The air inlet on the right side of the low-pressure steam water pump 16 is connected to the off-site low-pressure steam collection system 19, and the steam-liquid outlet at the bottom of the low-pressure steam water pump 16 is connected to the steam-liquid inlet on the right side of the top of the hot water circulation tank 17. The steam outlet in the middle of the top of the hot water circulation tank 17 is connected to the steam outlet pipe 22.

[0022] The filtered water inlet at the top of the low-pressure steam water pump 16 is connected to the filtered water outlet 10 of the synthesis furnace 1, the desalted water inlet on the right side of the hot water circulation tank 17 is connected to the desalted water storage system 20, and the hot water outlet at the bottom of the hot water circulation tank 17 is connected to the hot water circulation pump group 18. A forced circulation water pump 21 is provided between the second flash tank 13 and the synthesis furnace 1. The hot water circulation pump group 18 includes a first hot water circulation pump 181 and a second hot water circulation pump 182. The water outlet of the first hot water circulation pump 181 is connected to the circulating pure water inlet 4 of the synthesis furnace 1, and the water outlet of the second hot water circulation pump 182 is connected to the pipeline between the second flash tank 13 and the forced circulation water pump 21.

[0023] The working process of the present invention is as follows: the high-pressure steam production unit of the synthesis furnace 1 absorbs the reaction heat of the hydrogen chloride gas to produce superheated water, the temperature of the superheated water is ≤143°C, the superheated water enters the first flash tank 11 through a pipeline, the first flash tank 11 flashes the superheated water, part of the water vaporizes into 1.0MpG high-pressure steam output, and most of the hot water circulates back to the jacket of the synthesis furnace 1; the low-pressure steam production unit of the synthesis furnace 1 absorbs the reaction heat of the hydrogen chloride gas to produce superheated water, the superheated water is pressurized by the forced circulation water pump 21 and enters the second flash tank 13, the second flash tank 13 is used for the second flash tank 14. Tank 13 flashes the superheated water, and part of the water vaporizes into 0.3MpG low-pressure steam output, and most of the hot water is forced to circulate back to the jacket of the synthesis furnace 1; the hot water circulation pump group 18 of the waste steam treatment unit of the synthesis furnace 1 is pressurized so that the hot water enters the synthesis section of the synthesis furnace 1 for heat exchange, and the temperature of the hot water is ≤110°C. The low-pressure steam collection system 19 outside the boundary draws in low-pressure waste steam through the low-pressure steam water pump 16 to heat the circulating hot water; at the same time, the circulating hot water is supplemented to the by-product low-pressure steam jacket of the synthesis furnace 1 through the control of the automatic valve of the forced circulation water pump 21.

[0024] The increase in the feed water temperature in the synthesis furnace 1 not only makes full use of the waste heat and increases the amount of by-product high and low pressure steam, but also plays a role in deoxygenating the feed water and slowing down the corrosion of the by-product steam jacket; the hot water circulation tank 17 is controlled by a regulating valve to automatically replenish desalted water in the hot water circulation tank 17 to ensure the liquid level of the hot water circulation tank 17.

[0025] The above disclosure is only a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A hydrogen chloride synthesis system with high by-product 1.0 MPaG steam, characterized in that: It comprises a synthesis furnace (1), and a high-pressure steam production unit, a low-pressure steam production unit and a waste steam treatment unit respectively connected to the synthesis furnace (1); The synthesis furnace (1) is provided with a synthesis section, a steam circulation section and a cooling section in sequence from bottom to top, and the three sections are all composed of a graphite cylinder and a steel shell sleeved outside the cylinder. The steam circulation section is provided with a high-pressure steam-liquid outlet (2), a hot water reflux inlet (3), a circulating pure water inlet 1 (4), a circulating pure water inlet 2 (5) and a circulating pure water outlet (6); The cooling section is provided with a pure water inlet (7), a low-pressure vapor-liquid outlet (8), a vapor-liquid inlet (9) and a filtered water outlet (10); The high-pressure steam production unit includes a first flash tank (11), a high-pressure vapor-liquid inlet on the left side of the first flash tank (11) is connected to a high-pressure vapor-liquid outlet (2) of the synthesis furnace (1), a hot water outlet on the lower right side of the first flash tank (11) is connected to a hot water reflux inlet (3) of the synthesis furnace (1), and a steam outlet at the top of the first flash tank (11) is connected to a first steam main pipe (12); The low-pressure steam production unit comprises a second flash tank (13) and a high-pressure water supply pump (14); the low-pressure vapor-liquid inlet on the left side of the second flash tank (13) is connected to the low-pressure vapor-liquid outlet (8) of the synthesis furnace (1); the steam outlet at the top of the second flash tank (13) is connected to a second steam main pipe (15); the vapor-liquid outlet at the bottom of the second flash tank (13) is connected to the vapor-liquid inlet (9) of the synthesis furnace (1); the water outlet of the high-pressure water supply pump (14) is connected to the water inlet on the upper right side of the second flash tank (13); and the water outlet on the lower right side of the second flash tank (13) is connected to the high-pressure water supply pump (14); The waste steam treatment unit comprises a low-pressure steam water pump (16), a hot water circulation tank (17) and a hot water circulation pump group (18); the air inlet on the right side of the low-pressure steam water pump (16) is connected to an off-site low-pressure steam collection system (19); the vapor-liquid outlet at the bottom of the low-pressure steam water pump (16) is connected to the vapor-liquid inlet on the right side of the top of the hot water circulation tank (17); the filtered water inlet at the top of the low-pressure steam water pump (16) is connected to the filtered water outlet (10) of the synthesis furnace (1); and the desalted water inlet on the right side of the hot water circulation tank (17) is connected to a desalted water storage system (20). The hot water outlet at the bottom of the hot water circulation tank (17) is connected to the hot water circulation pump group (18), and a forced circulation water pump (21) is provided between the second flash tank (13) and the synthesis furnace (1). The hot water circulation pump group (18) includes a first hot water circulation pump (181) and a second hot water circulation pump (182). The water outlet of the first hot water circulation pump (181) is connected to the circulating pure water inlet (4) of the synthesis furnace (1), and the water outlet of the second hot water circulation pump (182) is connected to the pipeline between the second flash tank (13) and the forced circulation water pump (21).

2. A hydrogen chloride synthesis system with high by-product 1.0 MPaG steam according to claim 1, characterized in that: The steam outlet in the middle of the top of the hot water circulation tank (17) is connected to a steam outlet pipe (22).

3. The hydrogen chloride synthesis system with high by-product 1.0 MPaG steam according to claim 1, characterized in that: The sewage outlet at the bottom of the first flash tank (11) is connected to a sewage pipe (23), and a sewage sampling cooler (24) is provided at the end of the sewage pipe (23).

4. A hydrogen chloride synthesis system with high by-product 1.0 MPaG steam according to claim 3, characterized in that: The bottom of the synthesis furnace (1) is provided with an acid discharge port (25), and the upper portion is provided with a condensed acid discharge port (26). The acid discharge port (25) is communicated with the condensed acid discharge port (26) and is also communicated with the wastewater sampling cooler (24).

5. The hydrogen chloride synthesis system with high by-product 1.0 MPaG steam according to claim 1, characterized in that: The bottom of the synthesis furnace (1) is provided with a jacket drain port (27).

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