A liquid ammonia adding device for an ammonia decomposition hydrogen production furnace

Abstract

The present invention belongs to the technical field of ammonia decomposition hydrogen production furnaces, and in particular relates to a liquid ammonia adding device for an ammonia decomposition hydrogen production furnace, which includes a tank body. The tank body has a gasification chamber with an open bottom, and an access hole penetrating the circumferential side wall of the tank body is provided at the top. A thin-walled tube is installed through the tank body at the top opposite to the access hole. Liquid ammonia enters the tank body from the top and slowly flows on the guide frame. The bottom of the tank body uses flowing air to provide heat, and the heat in the atmosphere is used to complete the endothermic gasification of the liquid ammonia. The unvaporized liquid ammonia flows through the dispersion plate and contacts the partition plate to quickly increase the temperature and gasify. The low-temperature ammonia gas will contact the air again at the position of the thin-walled tube for supplementary heating, and ammonia gas at room temperature state is obtained, so as to increase the temperature of the raw material entering the decomposition furnace.

Description

Technical Field

[0001] The present invention relates to the technical field of ammonia decomposition hydrogen production furnaces, and particularly to a liquid ammonia adding device for an ammonia decomposition hydrogen production furnace. Background Art

[0002] An ammonia decomposition hydrogen production furnace uses liquid ammonia as a raw material, and under the action of a catalyst, it is heated and decomposed to obtain a hydrogen-nitrogen mixed gas containing 75% hydrogen and 25% nitrogen. To ensure the continuous operation of the equipment, an automated liquid ammonia adding device is required to provide the raw material.

[0003] The existing liquid ammonia adding device needs to gasify the liquid ammonia before adding it to the decomposition furnace. When gasifying, the liquid ammonia is mostly added to a pressure-reducing tank with a larger volume, so that the liquid ammonia is heated and expanded to gasify. However, when heating, the liquid ammonia directly contacts the heat source and gasifies instantaneously. Therefore, it is necessary to control the inlet amount of the liquid ammonia to avoid the instantaneous gasification of a large amount of liquid ammonia at the same time, which will cause an instantaneous change in the air pressure of the pressure-reducing tank and affect safety. For this reason, we propose a liquid ammonia adding device for an ammonia decomposition hydrogen production furnace to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems existing in the prior art, and to propose a liquid ammonia adding device for an ammonia decomposition hydrogen production furnace.

[0005] To achieve the above purpose, the present invention adopts the following technical scheme:

[0006] A liquid ammonia adding device for an ammonia decomposition hydrogen production furnace, including a tank body. The tank body has a gasification cavity with an open bottom, and an access hole is provided at the top, penetrating through the circumferential side wall of the tank body. A thin-walled tube is installed through the tank body at the top opposite to the access hole.

[0007] A heat supply base is located at the open bottom position of the tank body to seal the gasification cavity. An air chamber with an air inlet and outlet is opened in the heat supply base. A partition is installed at the top of the heat supply base to separate the air chamber from the gasification cavity. An air pump is provided at the air inlet position of the air chamber to supply a normal temperature air flow.

[0008] A guide frame has a plurality of semi-circular thin plates, and the thin plates are stacked in a staggered manner up and down. A convection channel is formed between the thin plates. The liquid ammonia entering through the access hole flows downward through the convection channel to the partition, and the ammonia gas formed by the heating and gasification of the liquid ammonia flows upward through the convection channel to the thin-walled tube and is discharged from the tank body.

[0009] Preferably, a liquid ammonia pipe is installed at the port position of the access hole, and a cryogenic pump is installed in series on the liquid ammonia pipe. The cryogenic pump is arranged in a chassis.

[0010] Preferably, a sleeve is coaxially arranged outside the liquid ammonia pipe, and a heat insulating material is filled between the sleeve and the liquid ammonia pipe.

[0011] Preferably, a vertical sleeve is installed at the center position of the thin plate, a middle rod is installed through the middle hole of the sleeve, and a dispersion plate with closely arranged fine holes is installed at the bottom end of the middle rod.

[0012] Preferably, the middle rod is slidably connected to the sleeve, and a limit head is installed on the outer side above the sleeve at the top of the middle rod.

[0013] Preferably, a sliding rod is installed through the middle of the lowermost thin plate in a sliding manner, a baffle is fixed at the bottom of the sliding rod, and the baffle is formed by trisecting a thin plate.

[0014] Preferably, an embedding opening is formed in the middle of the baffle, and a counterweight is installed in the embedding opening.

[0015] Preferably, a distribution pipe is installed at the exhaust port of the air chamber, the distribution pipe is conductively installed with a housing, the housing is sleeved outside the thin-walled pipe, and a port is arranged at the lateral position of the housing away from the distribution pipe.

[0016] Preferably, a plurality of branch pipes extending radially are arranged on the circumferential side wall of the distribution pipe, and the branch pipes penetrate and communicate with the bottom side wall of the housing.

[0017] Preferably, the thin-walled pipe is in the shape of a serpentine pipe, and an air passing gap is left between the circumferential side wall of the thin-walled pipe and the inner wall of the housing.

[0018] Compared with the prior art, the advantages of the liquid ammonia adding device for an ammonia decomposition hydrogen production furnace of the present invention are as follows:

[0019] 1. Through the setting of the tank body, liquid ammonia enters the tank body from the top, slowly flows on the guide frame, the bottom of the tank body uses flowing air to provide heat, and the heat in the atmosphere is used to complete the endothermic gasification of liquid ammonia. The unvaporized liquid ammonia flows through the dispersion plate and contacts the partition plate to quickly increase the temperature and gasify. The low-temperature ammonia gas will contact the air again at the position of the thin-walled pipe for supplementary heating, and ammonia gas at room temperature state is obtained, so as to increase the temperature of the raw material entering the decomposition furnace;

[0020] 2. A plurality of sliding baffles are installed near the dispersion plate. When the air pressure below the dispersion plate rises rapidly, part of the dispersion plate can be blocked to reduce the amount of liquid ammonia passing through the dispersion plate. When the pressure difference decreases, it will fall back to the reset position, automatically controlling the gasification rate, effectively avoiding the situation that the internal pressure of the tank rapidly rises due to the simultaneous gasification of excessive liquid ammonia, preventing the influence of too high internal pressure of the tank on the gasification efficiency, and also preventing potential safety hazards caused by too high tank pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the left view schematic diagram of the present invention;

[0022] Figure 2 is the rear view structure diagram of the present invention;

[0023] Figure 3Schematic cross-sectional view of the interior of the tank body of the present invention;

[0024] Figure 4 Schematic cross-sectional view between the tank body and the heat supply base of the present invention;

[0025] Figure 5 Schematic position diagram of the interior of the tank body of the present invention;

[0026] Figure 6 Schematic position diagram between the dispersion plate and the baffle of the present invention;

[0027] Figure 7 Schematic cross-sectional view between the guide frame and the baffle and their connected components of the present invention;

[0028] Figure 8 Structural relationship diagram of the position of the thin-walled tube of the present invention.

[0029] In the figure: liquid ammonia pipe 1, manhole 11, cryogenic pump 12, tank body 2, thin-walled tube 3, housing 4, gas distribution pipe 41, port 42, chassis 5, heat supply base 6, air pump 61, partition plate 62, air chamber 63, guide frame 7, dispersion plate 71, sleeve 72, middle rod 73, sliding rod 74, baffle 75, counterweight 76. Detailed implementation manner

[0030] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0031] This embodiment provides a liquid ammonia adding device for an ammonia decomposition hydrogen production furnace, including a tank body 2. The tank body 2 has a gasification cavity with an open bottom, and a manhole 11 penetrating through the circumferential side wall of the tank body 2 is provided at the top. A thin-walled tube 3 is installed through the tank body 2 at the position opposite to the manhole 11 at the top of the tank body 2;

[0032] A heat supply base 6 is located at the open bottom position of the tank body 2 to seal the gasification cavity. An air chamber 63 with an air inlet and outlet is opened in the heat supply base 6. A partition plate 62 separating the air chamber 63 from the gasification cavity is installed at the top of the heat supply base 6. An air pump 61 is provided at the air inlet position of the air chamber 63 to provide a normal temperature air flow;

[0033] A guide frame 7 has a plurality of semicircular thin plates, which are arranged in a stacked manner with upper and lower displacements. A convection channel is formed between the thin plates. The liquid ammonia entering from the manhole 11 flows downward through the convection channel to the partition plate 62, and the ammonia gas formed by the liquid ammonia heating and gasification flows upward through the convection channel to the thin-walled tube 3 and is discharged from the tank body 2.

[0034] The core of this embodiment is to solve the problem of the low initial temperature of the ammonia gas raw material. The specific steps are as follows:

[0035] First, turn on the air pump 61 to provide a normal-temperature air flow to the air chamber 63. The air chamber 63 and the vaporization chamber are separated by a partition 62 made of a good heat conductor material. Liquid ammonia enters the vaporization chamber of the tank body 2 from the position of the manhole 11, absorbs the heat provided by the partition 62 for the vaporization chamber, vaporizes as it descends and heats up. The guide frame 7 is formed with a convection channel using thin plates. The horizontal thin plates increase the residence time of liquid ammonia in the vaporization chamber. As it flows downward, since the temperature of the vaporization chamber is higher closer to the partition 62, the vaporization rate of liquid ammonia will gradually increase until the remaining liquid ammonia contacts the partition 62 and is directly heated and vaporized. The vaporized ammonia gas ascends and is discharged from the thin-walled tube 3 out of the tank body 2, and thus low-temperature ammonia gas can be obtained. Using the heat of air for heating, the vaporization is relatively gentle.

[0036] Specifically, preferably, a liquid ammonia pipe 1 is installed at the port position of the manhole 11, and a cryogenic pump 12 is installed in series on the liquid ammonia pipe 1. The cryogenic pump 12 is arranged in the chassis 5; the liquid ammonia can be input through the cryogenic pump 12 on the liquid ammonia pipe 1, and the input amount can be accurately controlled to ensure that the vaporization rate is controllable.

[0037] Furthermore, a sleeve is coaxially arranged outside the liquid ammonia pipe 1, and a heat insulator is filled between the sleeve and the liquid ammonia pipe 1; the sleeve is placed outside the liquid ammonia pipe 1 and filled with a heat insulator to insulate the liquid ammonia pipe 1, preventing the outer surface of the liquid ammonia pipe 1 from contacting humid air and frosting during transportation, or the liquid ammonia inside from vaporizing in advance, resulting in gas contacting the impeller of the cryogenic pump 12 and causing cavitation damage to the cryogenic pump 12.

[0038] Still further, a vertical sleeve 72 is installed at the center position of the thin plate. A middle rod 73 is installed through the middle hole of the sleeve 72, and a dispersion plate 71 with closely arranged fine holes is installed at the bottom end of the middle rod 73; the sleeve 72 can cooperate with the middle rod 73 to connect the dispersion plate 71. The remaining unvaporized liquid ammonia descends through the dispersion plate 71 and dispersedly contacts the partition 62, preventing local excessive liquid ammonia from causing violent boiling. The ammonia gas vaporized below ascends through the dispersion plate 71 and can contact the liquid ammonia at the position of the fine holes, causing the liquid ammonia to be pushed upward and vaporized at the position of the dispersion plate 71, reducing the amount of liquid ammonia that directly contacts the partition 62 and quickly vaporizes, and further ensuring gentle vaporization.

[0039] Still further, the middle rod 73 is slidably connected to the sleeve 72, and a limit head is installed at the outer side above the sleeve 72 at the top of the middle rod 73; the middle rod 73 can slide. When the instantaneous vaporization amount below the dispersion plate 71 is too large, the dispersion plate 71 will be pushed upward, and the lowermost thin plate will block half of the fine holes of the dispersion plate 71, reducing the amount of liquid ammonia passing through the dispersion plate 71, and thus actively controlling the vaporization amount of the liquid ammonia below.

[0040] Furthermore, a slide rod 74 is slidably installed through the middle of the thin plate at the bottom, and a baffle 75 is fixed to the bottom of the slide rod 74. The baffle 75 is formed by dividing a thin plate into three equal parts; the segmented baffle 75 structure can actively block different numbers of pores according to the size of the pressure difference. If the pressure difference is large, more pores are blocked, and if the pressure difference is small, less pores are blocked, making the active control more sensitive.

[0041] Furthermore, an embedding opening is opened in the middle of the baffle 75, and a counterweight block 76 is installed in the embedding opening; the counterweight block 76 can drive the baffle 75 to move downward and reset when the dispersion plate 71 moves downward, waiting for the next active control, thereby ensuring stable operation when the pressure difference changes frequently.

[0042] Specifically, the exhaust port of the gas chamber 63 is equipped with an air distribution pipe 41, and the air distribution pipe 41 is connected to a cover 4, which is sleeved on the outside of the thin-walled tube 3. The cover 4 has a port 42 set on the side of the cover 4 away from the air distribution pipe 41; before the room temperature air enters the gas chamber 63 for heat exchange, the low-temperature ammonia gas that has completed gasification will be heated for a second time through the thin-walled tube 3 to ensure that room temperature ammonia is obtained, reduce the power consumption of the subsequent decomposition furnace for heating the raw materials, and reduce the temperature of the air contacting the partition 62, avoid excessive temperature difference between the partition 62 and the liquid ammonia, and prevent excessive gasification.

[0043] It is worth noting that a plurality of radially extending branch pipes are arranged on the circumferential side wall of the air distribution pipe 41, and the branch pipes are connected to the bottom side wall of the cover 4. The incoming gas will enter the air distribution pipe 41 through multiple branch pipes, which can ensure that the incoming air can flow into the entire cover 4 and ensure that the entire thin-walled tube 3 will only be heated by normal temperature air.

[0044] It is worth noting that the thin-walled tube 3 adopts a serpentine tube shape, and there is a wind gap between the circumferential side wall of the thin-walled tube 3 and the inner wall of the cover 4. By flowing out of the wind gap, it is ensured that the air flow can flow into the innermost side of the cover 4, and further fully utilize the surface area of the thin-walled tube 3 to heat the low-temperature ammonia gas.

[0045] The power supply module, electric control equipment, circuits and electronic components, and control module involved in the present invention are all existing technologies and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to the internal structure and methods.

[0046] The above are only preferred specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A liquid ammonia adding device for an ammonia decomposition hydrogen production furnace, characterized in that, It includes the following structures: A tank body (2), the tank body (2) has a gasification chamber with an open bottom, and a manhole (11) is provided at the top, penetrating the circumferential side wall of the tank body (2). A thin-walled tube (3) is installed through the tank body (2) at the top opposite to the manhole (11); A heating base (6), the heating base (6) is located at the open bottom position of the tank body (2) to seal the gasification chamber. An air chamber (63) with an air inlet and outlet is opened in the heating base (6). A partition plate (62) that separates the air chamber (63) from the gasification chamber is installed at the top of the heating base (6). An air pump (61) is provided at the air inlet position of the air chamber (63) to provide a normal temperature air flow; A guide frame (7), the guide frame (7) has a plurality of semi-circular thin plates, the thin plates are stacked in a staggered manner up and down, and a convection channel is formed between the thin plates. The liquid ammonia entering from the manhole (11) flows downward through the convection channel to the partition plate (62), and the ammonia gas formed by the liquid ammonia heating and gasification flows upward through the convection channel to the thin-walled tube (3) and is discharged from the tank body (2); A vertical sleeve (72) is installed at the center position of the thin plate, and a middle rod (73) is installed through the middle hole of the sleeve (72). A dispersion plate (71) with closely arranged fine holes is installed at the bottom end of the middle rod (73); The middle rod (73) is slidably connected to the sleeve (72), and a limit head is installed outside the sleeve (72) above the top of the middle rod (73); A sliding rod (74) is installed through and slidably in the middle of the lowermost thin plate, and a baffle (75) is fixed at the bottom of the sliding rod (74). The baffle (75) is formed by trisecting a thin plate; An embedding opening is provided in the middle of the baffle (75), and a counterweight (76) is installed in the embedding opening.

2. The liquid ammonia adding device for an ammonia decomposition hydrogen production furnace according to claim 1, characterized in that, A liquid ammonia pipe (1) is installed at the port position of the manhole (11), and a cryogenic pump (12) is installed in series on the liquid ammonia pipe (1). The cryogenic pump (12) is arranged in a chassis (5).

3. The liquid ammonia adding device for an ammonia decomposition hydrogen production furnace according to claim 2, wherein, A sleeve is coaxially arranged outside the liquid ammonia pipe (1), and a heat insulator is filled between the sleeve and the liquid ammonia pipe (1).

4. The liquid ammonia adding device for an ammonia decomposition hydrogen production furnace according to claim 1, characterized in that, A distribution pipe (41) is installed at the exhaust port of the air chamber (63). The distribution pipe (41) is conductively installed with a housing (4). The housing (4) is sleeved outside the thin-walled tube (3), and a port (42) is provided at a position laterally away from the distribution pipe (41) of the housing (4).

5. An ammonia addition device for an ammonia decomposition hydrogen production furnace according to claim 4, characterized in that, A plurality of branch pipes extending radially are arranged on the circumferential side wall of the distribution pipe (41), and the branch pipes penetrate and communicate with the bottom side wall of the housing (4).

6. The liquid ammonia adding device for an ammonia decomposition hydrogen production furnace according to claim 5, wherein, The thin-walled tube (3) is in a serpentine tube shape, and an air passing gap is left between the circumferential side wall of the thin-walled tube (3) and the inner wall of the housing (4).

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