A complementary hydrogen production system for a hydrogen furnace and a hydrogen production method thereof

Abstract

The present application relates to the field of hydrogen production, and provides a complementary hydrogen production system for a hydrogen smelting furnace, comprising a smelting furnace, a hydrogen production device, a raw gas buffer tank, a waste heat recovery device, a carbon dioxide recovery device, a smoke window, a hydrogen purification device, a hydrogen storage tank and a flue gas mixing chamber; the present application uses flue gas to heat the hydrogen production device, instead of direct electric heating, eliminating the safety hazards existing in direct electric heating; the hydrogen production device adopts a structure of multiple hydrogen production furnace cores, realizing the scaling of hydrogen production, and facilitating the maintenance of the equipment; the present application fully utilizes the carbon dioxide recovery device of the smelting furnace itself, recovers the desorbed carbon dioxide in the hydrogen production process, realizes zero carbon dioxide emission, and recovers the waste gas heat after hydrogen production by using the waste heat recovery system of the smelting furnace itself, improving the energy utilization efficiency.

Description

Technical Field

[0001] This invention relates to the field of hydrogen production, and more particularly to a complementary hydrogen production system for hydrogen melting furnaces and a method thereof. Background Technology

[0002] In order to address climate change and improve the use of clean energy in melting furnaces, the utilization of hydrogen energy has become an indispensable part.

[0003] At present, traditional hydrogen production processes in China include hydrogen production through natural gas cracking, hydrogen production through water electrolysis, hydrogen production through ammonia decomposition, hydrogen production through methanol cracking, and hydrogen production through the recovery and purification of chemical plant tail gas. All of these methods require electricity, with water electrolysis consuming the most electricity.

[0004] Glass factories use a large amount of hydrogen in their melting furnaces, and the flue gas discharged from the furnaces is at a high temperature and in large volume. If the heat energy of the furnace flue gas is used to provide heat energy for the hydrogen production process, then hydrogen combustion can provide energy for the melting furnace, and the furnace flue gas can provide heat for hydrogen production, thus achieving complementary hydrogen production. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a complementary hydrogen production system and method for hydrogen melting furnaces.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A first aspect of the present invention is to provide a complementary hydrogen production system for a hydrogen melting furnace, comprising: a melting furnace, a hydrogen production device, a raw material gas buffer tank, a waste heat recovery device, a carbon dioxide recovery device, a chimney, a hydrogen purification device, a hydrogen storage tank, and a flue gas mixing chamber.

[0008] The discharge port of the melting furnace is connected to the first inlet of the flue gas mixing chamber and the first inlet of the waste heat recovery device, respectively; the discharge port of the waste heat recovery device is connected to the second inlet of the flue gas mixing chamber and the first inlet of the carbon dioxide recovery device, respectively; several discharge ports of the flue gas mixing chamber are connected to several flue gas inlets of the hydrogen production device, and several flue gas outlets of the hydrogen production device are all connected to the second inlet of the waste heat recovery device; the inlet of the raw material gas buffer tank is connected to the discharge port of the raw material gas storage tank, and so on. The outlet of the raw material gas buffer tank is connected to several inlets of the hydrogen production unit via several first distribution pipelines. The outlets of the hydrogen production unit are connected to the inlets of the hydrogen purification unit via several second distribution pipelines. The first outlet of the hydrogen purification unit is connected to the second inlet of the carbon dioxide recovery unit. The second outlet of the hydrogen purification unit is connected to the inlet of the hydrogen storage tank. The outlet of the hydrogen storage tank is connected to the gas inlet of the melting furnace. The outlet of the carbon dioxide recovery unit is connected to the inlet of the chimney.

[0009] All connections are pipe connections.

[0010] Preferably, a first flue gas valve and a first compensator are sequentially connected by pipelines between the discharge port of the melting furnace and the first feed port of the flue gas mixing chamber.

[0011] More preferably, a second compensator, a first induced draft fan, and a second flue gas valve are sequentially connected by pipelines between the outlet of the waste heat recovery device and the second inlet of the flue gas mixing chamber.

[0012] More preferably, a third compensator, a second induced draft fan, and a third flue gas valve are sequentially connected by pipelines between several flue gas outlets of the hydrogen production device and the second feed inlet of the waste heat recovery device.

[0013] More preferably, a flow meter is connected in a pipeline between the outlet of the hydrogen storage tank and the inlet of the melting furnace.

[0014] More preferably, a distribution valve is provided on each of the first distribution pipelines and the second distribution pipelines.

[0015] More preferably, it further includes: a control cabinet; the control cabinet is electrically connected to the flow meter, a plurality of the distribution valves, the first flue gas valve, the second flue gas valve, the third flue gas valve and the hydrogen production device.

[0016] Preferably, the hydrogen production device includes: a shell and a plurality of hydrogen production furnace cores;

[0017] The shell contains a cavity and several baffles, which divide the cavity into several heating and constant temperature chambers. The first side wall of the shell has several ash-removing holes corresponding to the heating and constant temperature chambers. The inner wall of the shell has an insulation layer. Several hydrogen-producing furnace cores are respectively located within the heating and constant temperature chambers, with the inlet of each furnace core connected to the outlet of the raw material gas buffer tank, and the outlet of each furnace core connected to the inlet of the hydrogen purification device. The second side wall of the shell has several flue gas inlets, and the third side wall has several flue gas outlets, with the second and third side walls of the shell facing each other.

[0018] More preferably, the hydrogen production furnace core is equipped with a catalyst.

[0019] More preferably, it further includes: a dust removal device; the dust removal device is used to clean the dust removal holes.

[0020] A second aspect of the present invention is to provide a complementary hydrogen production method for a hydrogen melting furnace, employing the above-described complementary hydrogen production system, comprising the following steps:

[0021] S1. Extract a portion of the high-temperature flue gas from the furnace and a portion of the low-temperature flue gas treated by the waste heat recovery device, and mix and adjust the temperature in the flue gas mixing chamber to obtain a mixed gas.

[0022] S2. After the mixed gas is fed into the hydrogen production device to heat the hydrogen production device, the mixed gas is sent to the waste heat recovery device by the second induced draft fan to recover the residual heat in the mixed gas.

[0023] S3. The raw gas in the raw gas storage tank is sent to the raw gas buffer tank for buffering. Several distribution valves send the raw gas to each hydrogen production furnace core of the hydrogen production device for hydrogen production. After the hydrogen production is completed, the crude hydrogen is collected by the distribution valve and enters the hydrogen purification device for purification treatment to obtain CO2-containing waste gas and pure hydrogen. The CO2-containing waste gas is treated by the carbon dioxide recovery device and then discharged into the atmosphere through the chimney. The pure hydrogen enters the hydrogen storage tank, is metered by the flow meter, and is used for combustion in the melting furnace.

[0024] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0025] This invention uses flue gas to heat the hydrogen production device, replacing direct electric heating and eliminating the safety hazards associated with direct electric heating. The hydrogen production device adopts a multi-furnace core structure, enabling large-scale hydrogen production while facilitating equipment maintenance. This invention fully utilizes the furnace's own carbon dioxide recovery device to recover the carbon dioxide desorbed during hydrogen production, achieving zero carbon dioxide emissions. This invention also utilizes the furnace's own waste heat recovery system to recover the heat from the waste gas after hydrogen production, improving energy utilization efficiency. Attached Figure Description

[0026] Figure 1 This is a flowchart of a complementary hydrogen production system for a hydrogen melting furnace according to an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the basic structure of a hydrogen production device in one embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional view of a hydrogen production apparatus according to an embodiment of the present invention;

[0029] The reference numerals in the figure include:

[0030] Melting furnace 1; First flue gas valve 21; Second flue gas valve 22; Third flue gas valve 23; First compensator 31; Second compensator 32; Third compensator 33; Hydrogen production unit 4; Shell 41; Hydrogen production furnace core 42; Baffle 43; Heating and constant temperature chamber 44; Ash removal hole 45; Insulation layer 46; Raw material gas buffer tank 5; First induced draft fan 61; Second induced draft fan 62; Waste heat recovery device 7; Carbon dioxide recovery device 8; Chimney 9; Hydrogen purification device 10; Control cabinet 11; Hydrogen storage tank 12; Flow meter 13; Ash removal device 14; Flue gas mixing chamber 15. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0034] Example

[0035] like Figure 1-3As shown, this embodiment provides a complementary hydrogen production system for a hydrogen melting furnace, including: a melting furnace 1, a hydrogen production device 4, a raw material gas buffer tank 5, a waste heat recovery device 7, a carbon dioxide recovery device 8, a chimney 9, a hydrogen purification device 10, a control cabinet 11, a hydrogen storage tank 12, a flow meter 13, a dust removal device 14, and a flue gas mixing chamber 15.

[0036] The discharge port of the melting furnace 1 is connected to the first inlet of the flue gas mixing chamber 15 and the first inlet of the waste heat recovery device 7 via pipelines. A first flue gas valve 21 and a first compensator 31 are sequentially connected between the discharge port of the melting furnace 1 and the first inlet of the flue gas mixing chamber 15 via pipelines. The discharge port of the waste heat recovery device 7 is connected to the second inlet of the flue gas mixing chamber 15 and the first inlet of the carbon dioxide recovery device 8 via pipelines. The discharge port of the waste heat recovery device 7 is connected to the second inlet of the flue gas mixing chamber 15 via pipelines. The secondary pipeline is connected to a second compensator 32, a first induced draft fan 61, and a second flue gas valve 22; several outlets of the flue gas mixing chamber 15 are respectively connected to several flue gas inlet pipelines of the hydrogen production unit 4, and several flue gas outlets of the hydrogen production unit 4 are all connected to the second inlet pipeline of the waste heat recovery unit 7; a third compensator 33, a second induced draft fan 62, and a third flue gas valve 23 are sequentially connected between several flue gas outlets of the hydrogen production unit 4 and the second inlet of the waste heat recovery unit 7; the inlet of the raw material gas buffer tank 5 is connected to the outlet of the raw material gas storage tank. The feed inlet pipeline is connected as follows: the outlet of the raw material gas buffer tank 5 is connected to several inlet pipelines of the hydrogen production device 4 through several first distribution pipelines; several outlets of the hydrogen production device 4 are connected to the inlet pipeline of the hydrogen purification device 10 through several second distribution pipelines; each of the first and second distribution pipelines is equipped with a distribution valve; the first outlet of the hydrogen purification device 10 is connected to the second inlet pipeline of the carbon dioxide recovery device 8; and the second outlet of the hydrogen purification device 10 is connected to the inlet pipeline of the hydrogen storage tank 12. The hydrogen storage tank 12 is connected to the inlet of the furnace 1 via a pipeline; a flow meter 13 is connected between the outlet of the hydrogen storage tank 12 and the inlet of the furnace 1 via a pipeline; the outlet of the carbon dioxide recovery device 8 is connected to the inlet of the chimney 9 via a pipeline; the control cabinet 11 is electrically connected to the flow meter 13, several distribution valves, the first flue gas valve 21, the second flue gas valve 22, the third flue gas valve 23, and the hydrogen production device 4; the ash removal device 14 is used to clean the ash removal holes 45.

[0037] The hydrogen production device 4 includes: a shell 41 and a plurality of hydrogen production furnace cores 42;

[0038] The housing 41 has a cavity and several baffles 43, which divide the cavity to form several heating and constant temperature chambers 44. The first side wall of the housing 41 has several ash removal holes 45 corresponding to the heating and constant temperature chambers 44. The inner wall of the housing 41 has an insulation layer 46. Several hydrogen production furnace cores 42 are respectively disposed within the heating and constant temperature chambers 44, with the inlet of each hydrogen production furnace core 42 connected to the outlet of the raw material gas buffer tank 5, and the outlet of each hydrogen production furnace core 42 connected to the inlet of the hydrogen purification device 10. A catalyst is disposed within each hydrogen production furnace core 42. The second side wall of the housing 41 has several flue gas inlets, and the third side wall of the housing 41 has several flue gas outlets, with the second and third side walls of the housing 41 arranged opposite to each other.

[0039] The usage process of a complementary hydrogen production system is as follows:

[0040] A portion of the high-temperature flue gas from the melting furnace 1 and a portion of the low-temperature flue gas treated by the waste heat recovery device 7 are extracted, mixed and temperature-adjusted in the flue gas mixing chamber 15, and then sent to the hydrogen production device 4 to heat the device. The mixed gas is then sent to the waste heat recovery device 7 of the melting furnace 1 itself by the induced draft fan 6 to recover the remaining heat from the mixed gas. The induced draft fan 6 is frequency-controlled, and the system temperature is controlled by the temperature sensors of the hydrogen production device, the high-temperature flue gas, and the low-temperature flue gas, as well as by the first flue gas valve 21, the second flue gas valve 22, and the third flue gas valve 23. The first induced draft fan 61 and the second induced draft fan 62 are adjusted to achieve constant temperature hydrogen production. The raw material gas, such as natural gas or ammonia, which needs to be heated, cracked or decomposed to produce hydrogen, is buffered by the raw material gas buffer tank 5 and then enters each hydrogen production furnace core 42 of the hydrogen production unit 4 through the distribution valve. The crude hydrogen produced by the hydrogen production unit 4 is collected and then enters the hydrogen purification unit 10 for purification treatment to obtain CO2-containing waste gas and pure hydrogen. The CO2-containing waste gas is treated by the carbon dioxide recovery unit 8 and then discharged into the atmosphere through the chimney 9. The pure hydrogen enters the hydrogen storage tank 12 and is metered by the flow meter 13 before being supplied to the furnace 1 for combustion.

[0041] In summary, this invention uses flue gas to heat the hydrogen production device, replacing direct electric heating and eliminating the safety hazards associated with direct electric heating. The hydrogen production device employs a multi-furnace core structure, enabling large-scale hydrogen production while facilitating equipment maintenance. This invention fully utilizes the furnace's own carbon dioxide recovery device to recover carbon dioxide desorbed during hydrogen production, achieving zero carbon dioxide emissions. Furthermore, this invention utilizes the furnace's own waste heat recovery system to recover heat from the waste gas after hydrogen production, improving energy utilization efficiency.

[0042] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A complementary hydrogen production system for a hydrogen melting furnace, characterized in that, include: The furnace (1), hydrogen production unit (4), raw gas buffer tank (5), waste heat recovery unit (7), carbon dioxide recovery unit (8), chimney (9), hydrogen purification unit (10), hydrogen storage tank (12) and flue gas mixing chamber (15); The discharge port of the melting furnace (1) is connected to the first inlet of the flue gas mixing chamber (15) and the first inlet of the waste heat recovery device (7); the discharge port of the waste heat recovery device (7) is connected to the second inlet of the flue gas mixing chamber (15) and the first inlet of the carbon dioxide recovery device (8); several discharge ports of the flue gas mixing chamber (15) are connected to several flue gas inlets of the hydrogen production device (4), and several flue gas outlets of the hydrogen production device (4) are connected to the second inlet of the waste heat recovery device (7); the inlet of the raw material gas buffer tank (5) is connected to the outlet of the raw material gas storage tank. The outlet of the gas buffer tank (5) is connected to the inlet of the hydrogen production device (4) through several first distribution pipelines. The outlet of the hydrogen production device (4) is connected to the inlet of the hydrogen purification device (10) through several second distribution pipelines. The first outlet of the hydrogen purification device (10) is connected to the second inlet of the carbon dioxide recovery device (8). The second outlet of the hydrogen purification device (10) is connected to the inlet of the hydrogen storage tank (12). The outlet of the hydrogen storage tank (12) is connected to the inlet of the furnace (1). The outlet of the carbon dioxide recovery device (8) is connected to the inlet of the chimney (9). All connections are pipe connections; The hydrogen production device (4) includes: a shell (41) and a plurality of hydrogen production furnace cores (42). The shell (41) is provided with a cavity and several baffles (43), which divide the cavity into several heating and constant temperature chambers (44); the first side wall of the shell (41) is provided with several ash removal holes (45) corresponding to the heating and constant temperature chambers (44); the inner wall of the shell (41) is provided with a heat insulation layer (46); several hydrogen production furnace cores (42) are respectively arranged in several heating and constant temperature chambers (44), and the inlet of the hydrogen production furnace core (42) is connected to the outlet pipe of the raw material gas buffer tank (5), and the outlet of the hydrogen production furnace core (42) is connected to the inlet pipe of the hydrogen purification device (10); several flue gas inlets are provided on the second side wall of the shell (41), and several flue gas outlets are provided on the third side wall of the shell (41), and the second side wall and the third side wall of the shell (41) are arranged opposite to each other. It also includes: a dust removal device (14); the dust removal device (14) is used to clean the dust removal hole (45).

2. The complementary hydrogen production system according to claim 1, characterized in that, The discharge port of the furnace (1) and the first inlet of the flue gas mixing chamber (15) are connected by a first flue gas valve (21) and a first compensator (31) in sequence.

3. The complementary hydrogen production system according to claim 2, characterized in that, The outlet of the waste heat recovery device (7) and the second inlet of the flue gas mixing chamber (15) are connected in sequence by a second compensator (32), a first induced draft fan (61) and a second flue gas valve (22).

4. The complementary hydrogen production system according to claim 3, characterized in that, A third compensator (33), a second induced draft fan (62), and a third flue gas valve (23) are sequentially connected by pipelines between several flue gas outlets of the hydrogen production device (4) and the second feed inlet of the waste heat recovery device (7).

5. The complementary hydrogen production system according to claim 4, characterized in that, A flow meter (13) is connected in a pipeline between the outlet of the hydrogen storage tank (12) and the inlet of the furnace (1).

6. The complementary hydrogen production system according to claim 5, characterized in that, A distribution valve is provided on several of the first distribution pipelines and several of the second distribution pipelines.

7. The complementary hydrogen production system according to claim 6, characterized in that, Also includes: Control cabinet (11); the control cabinet (11) is electrically connected to the flow meter (13), several of the distribution valves, the first flue gas valve (21), the second flue gas valve (22), the third flue gas valve (23) and the hydrogen production device (4).

8. A complementary hydrogen production method for a hydrogen melting furnace, employing the complementary hydrogen production system as described in any one of claims 1-7, characterized in that the steps... include: S1. Extract a portion of the high-temperature flue gas from the furnace (1) and a portion of the low-temperature flue gas after being treated by the waste heat recovery device (7), and mix and adjust the temperature in the flue gas mixing chamber (15) to obtain a mixed gas. S2. The mixed gas is fed into the hydrogen production device (4) and heated. Then, the mixed gas is sent to the waste heat recovery device (7) by the second induced draft fan (62) to recover the remaining heat in the mixed gas. S3. The raw gas in the raw gas storage tank is sent to the raw gas buffer tank (5) for buffering. Several distribution valves send the raw gas to each hydrogen production furnace core (42) of the hydrogen production device (4) for hydrogen production. After the hydrogen production is completed, the crude hydrogen is collected by the distribution valve and enters the hydrogen purification device (10) for purification treatment to obtain CO2-containing waste gas and pure hydrogen. The CO2-containing waste gas is treated by the carbon dioxide recovery device (8) and discharged into the atmosphere through the chimney (9). The pure hydrogen enters the hydrogen storage tank (12), is metered by the flow meter (13), and is used for combustion in the furnace (1).

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