A gas stabilization system in an STC furnace

Abstract

The utility model relates to the technical field of hydrogen production, and specifically to a gas stabilization system in an STC furnace, comprising an STC furnace, a mixed gas pipeline, and an ignition device, wherein the inlet of the STC furnace is located at the bottom of the STC furnace and is completely open, and the outlet of the mixed gas pipeline is arranged opposite to the inlet of the STC furnace; the utility model also comprises an air pipeline connected to the mixed gas pipeline, a manual valve, a solenoid valve, and a flow meter are arranged in sequence on the air pipeline according to the air flow direction, the flow meter is arranged vertically, and a fixing device for fixing the air pipeline is arranged at a position near the inlet and outlet of the flow meter on the air pipeline, and the fixing device is detachable; the scheme can stabilize CO and CO in the STC furnace. 2 The ratio value.

Description

Technical Field

[0001] The utility model relates to the technical field of hydrogen production, in particular to a gas stabilization system in an STC furnace. Background Art

[0002] At present, more than 95% of the world's hydrogen is produced from fossil resources such as coal, oil and natural gas, and more than half of them are produced from natural gas. Based on relatively low costs and more mature technology, natural gas hydrogen production has become a mainstream hydrogen production process.

[0003] There are many methods for producing hydrogen using natural gas. Among them, natural gas catalytic cracking is to decompose CH4 at high temperature to produce C and H2. Not only can H2 without CO and CO2 be obtained in the end, but also carbon nanofibers, graphene and other materials can be obtained, which reduces the carbon emission coefficient in the hydrogen production process. This method has received widespread attention in the industry in recent years.

[0004] In the intermediate process of natural gas catalytic cracking hydrogen production process, the gas obtained after the initial cracking of natural gas using catalyst includes H 2、 CO, CO 2、 O2, in which H2 accounts for the majority and CO2 content is low, the mixed gas needs to be burned in an STC furnace to consume the O2. The purpose of this step is to prevent the decarbonization of the inner wall surface of the STC furnace from chemically reacting with O2, and at the same time stabilize the ratio of CO and CO2 in a certain range. The ratio of CO and CO2 is recorded as:

[0005]

[0006] In preparation for the subsequent process of consuming CO and CO2, as the temperature in the STC furnace increases, the PF value needs to be controlled to increase to a certain standard value. However, the ratio of CO and CO2 in the existing STC furnace is prone to a sharp rise (i.e., much higher than the standard value) as the temperature in the furnace increases, which has an adverse effect on the work of controlling the PF value to be stable at the standard value. Therefore, how to stabilize the PF value in the STC furnace is a technical problem that needs to be solved urgently. Utility Model Content

[0007] The utility model provides a gas stabilization system in an STC furnace, which can stabilize the ratio of CO and CO2 in the STC furnace.

[0008] This application provides the following technical solutions:

[0009] A gas stabilization system in an STC furnace, comprising an STC furnace, a mixed gas pipeline, and an ignition device, characterized in that: the inlet of the STC furnace is located at the bottom of the STC furnace and is completely open, and the outlet of the mixed gas pipeline is arranged opposite to the inlet of the STC furnace;

[0010] It also includes an air duct connected to the mixed gas duct, on which a manual valve, a solenoid valve and a flow meter are arranged in sequence according to the air flow direction, the flow meter is arranged vertically, and fixing devices for fixing the air duct are arranged at positions near the inlet and outlet of the flow meter on the air duct, and the fixing devices are detachable.

[0011] Beneficial effects:

[0012] 1. The fundamental reason for the sharp rise in PF value is that the ratio of H2 and CO obtained after catalytic cracking of natural gas is different, that is, the amount of CO in the mixed gas entering the STC furnace will suddenly increase, resulting in a sharp rise in PF value. This solution sets up a separate air duct to mix air into the mixed gas in the mixed gas duct through the air duct. The main components of air are O2 and CO2. The combustion reaction of O2 and CO will also generate CO2. The CO content in the STC furnace decreases and the CO2 content increases. The PF value in the STC furnace can be quickly controlled and stabilized near the standard value.

[0013] 2. The bottom of the STC furnace is completely open and the outlet of the mixed gas pipeline is arranged opposite to the inlet of the STC furnace, which is conducive to the full combustion reaction of the mixed gas.

[0014] 3. In addition to the solenoid valve, a manual valve is also separately installed on the air pipe, which is an emergency mechanism in case of a failure of the solenoid valve. Generally speaking, the flow meter is arranged vertically for the sake of aesthetics and easy observation. The bottom of the flow meter, i.e., the flow meter inlet, is located at a relatively low position. It is more convenient for technicians to operate by installing the solenoid valve and the manual valve on the side of the air pipe close to the flow meter inlet.

[0015] 4. The fixation of the air duct has an important influence on the stability of the air flow rate. Fixing devices for fixing the air duct are provided at positions near the inlet and outlet of the flow meter on the air duct. The fixing device can fix the flow meter and the air duct at the same time, and the display result of the flow meter will be more accurate, which is of great significance for adjusting the air flow rate to stabilize the PF value in the STC furnace. The detachable structure makes it easier to install the fixing device during system installation.

[0016] Furthermore, as an improvement, a three-way valve is also included, and the mixed gas pipeline includes a first mixed gas pipeline and a second mixed gas pipeline. The three-way valve is connected to the air pipeline, the first mixed gas pipeline, and the second mixed gas pipeline respectively, and the other end of the second mixed gas pipeline away from the three-way valve is arranged opposite to the inlet of the STC furnace.

[0017] Beneficial effect: The air in the air pipe enters the mixed gas pipe through the three-way valve, specifically, enters the transition position of the mixed gas from the first mixed gas pipe to the second mixed gas pipe, that is, the installation position of the three-way valve.

[0018] Further, as an improvement, the fixing device includes a fixing plate, a right-angle connector fixedly connected to the fixing plate, and a clamp for detachably connecting the air duct and the right-angle connector.

[0019] Beneficial effects: The fixing device consisting of the fixing plate, the right-angle connector and the clamp has a simple structure and is durable and reliable.

[0020] Further, as an improvement, the fixing device includes a fixing plate, a right-angle connector fixedly connected to the fixing plate, and a U-shaped connector detachably connected to the right-angle connector, notches are provided on both sides of the U-shaped connector, and a through hole that snaps into place with the notch is provided on the fixing plate.

[0021] Beneficial effect: When the air duct needs to be fixed, it is only necessary to insert the U-shaped connector directly into the appropriate through hole and make the open end fit with the notched buckle to achieve the fixation of the U-shaped connector on the right-angle connector. The technician can operate it with bare hands without using auxiliary tools such as wrenches.

[0022] Furthermore, as an improvement, a spike portion is fixedly provided at the end of the U-shaped connecting piece.

[0023] Beneficial effect: The provision of the spike portion is to facilitate the insertion of the U-shaped connector into the through hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural schematic diagram of a first embodiment of a gas stabilization system in an STC furnace according to the utility model;

[0025] Figure 2 for Figure 1 Axonometric view of the STC furnace section;

[0026] Figure 3 for Figure 1 Side view of the flow meter section;

[0027] Figure 4 This is a schematic diagram of the structure of the fixing device in the second embodiment of the present utility model;

[0028] Figure 5 It is a curve diagram of the PF value when using the utility model. DETAILED DESCRIPTION

[0029] The following is further described in detail through specific implementation methods:

[0030] The marks in the drawings of the specification include: STC furnace 1, first mixed gas pipeline 2a, second mixed gas pipeline 2b, ignition device 3, air pipeline 4, manual valve 41, solenoid valve 42, flow meter 43, fan 44, three-way valve 5, fixing device 6, fixing plate 61, right-angle connector 62, through hole 621, clamp 63, U-shaped connector 64, notch 641, and spike 642.

[0031] Embodiment 1

[0032] Combination Figure 1-Figure 3 As shown, a gas stabilization system in an STC furnace 1 includes an STC furnace 1, a mixed gas pipeline, and an ignition device 3. The inlet of the STC furnace 1 is located at the bottom of the STC furnace 1 and is completely open. The outlet of the mixed gas pipeline is arranged opposite to the inlet of the STC furnace 1. The ignition port of the ignition device 3 is arranged at a 45-degree angle to the outlet of the mixed gas pipeline.

[0033] It also includes an air pipeline 4 and a three-way valve 5, and the air pipeline 4 is connected to the mixed gas pipeline; specifically, the mixed gas pipeline includes a first mixed gas pipeline 2a and a second mixed gas pipeline 2b, the first mixed gas pipeline 2a is used to be connected to a separately equipped natural gas cracking device, and the second mixed gas pipeline 2b is used to be connected to the inlet of the STC furnace 1, the three-way valve 5 is respectively connected to the air pipeline 4, the first mixed gas pipeline 2a, and the second mixed gas pipeline 2b, the other end of the second mixed gas pipeline 2b away from the three-way valve 5 is connected to the inlet of the STC furnace 1, and a manual valve 41, a solenoid valve 42, a flow meter 43, and a fan 44 are sequentially arranged on the air pipeline 4 according to the air flow direction, the flow meter 43 is arranged vertically, and a fixing device 6 for fixing the air pipeline 4 is arranged at a position near the inlet and outlet of the flow meter 43 on the air pipeline 4, and the fixing device 6 adopts a detachable structural design.

[0034] The fixing device 6 specifically includes a first fixing device 6 with the same structure that is closer to the outlet of the flow meter 43 and a second fixing device 6 that is closer to the inlet of the flow meter 43. Taking the first fixing device 6 as an example, the first fixing device 6 includes a fixing plate 61 vertically fixed to the workshop floor (the second fixing device 6 also includes the same fixing plate 61), a right-angle connector 62 fixedly connected to the fixing plate 61, and a clamp 63 for detachably connecting the air duct 4 and the right-angle connector 62. In this embodiment, the clamp 63 is a cast iron clamp 63 and is fastened with bolts.

[0035] The specific application process is as follows:

[0036] When in use, the mixed gas (containing a large amount of H2 and a small amount of CO, CO2, and O2) formed by the cracking of natural gas flows through the first mixed gas pipeline 2a and the second mixed gas pipeline 2b in sequence and enters the STC furnace 1. As the temperature in the STC furnace 1 increases, if the technician observes that the PF value in the STC furnace 1 exceeds the standard value and continues to rise, it is necessary to turn on the air. In the transition stage when the mixed gas enters the second mixed gas pipeline 2b from the first mixed gas pipeline 2a, the air in the air pipeline 4 (mainly containing CO2 and O2) is mixed into the mixed gas through the three-way valve 5, so that the PF value of the mixed gas entering the STC furnace 1 after the combustion reaction will not rise sharply, and the rising trend of the PF value can be timely and effectively controlled. A gas detector for detecting the CO and CO2 contents in the STC furnace 1 is pre-installed in the STC furnace 1, and the PF value (PF = (CO*CO) / CO2) can be directly calculated from the data detected by the gas detector.

[0037] Figure 5 The three curves in the curve diagram shown record the changes in PF values ​​under abnormal, standard and embodiment one situations respectively, the X-axis represents temperature and the Y-axis represents PF value; the abnormality represents the situation where a separate air duct 4 is not provided, the PF value rises sharply after 680°C and remains high, at this time it is necessary to adopt the interference method of providing an air duct 4 and mixing air into the mixed gas in embodiment one, so that the PF value approaches the standard.

[0038] Embodiment 2

[0039] The difference between this embodiment and the first embodiment is that Figure 3 and Figure 4 As shown, the fixing device 6 includes a fixing plate 61, a right-angle connector 62 fixedly connected to the fixing plate 61, and a U-shaped connector 64 detachably connected to the right-angle connector 62. The U-shaped connector 64 is made of elastic alloy. The U-shaped connector 64 includes an open end and a closed end. Notches 641 are provided on both sides of the open end of the U-shaped connector 64. A through hole 621 that snaps into the notch 641 is provided on the right-angle connector 62. An integrally formed spike portion 642 is provided at the end of the open end of the U-shaped connector 64. The spike portion 642 has a conical structure as a whole to facilitate insertion into the through hole 621.

[0040] When in use, when it is necessary to fix the air duct 4, it is only necessary to insert the U-shaped connector 64 directly into the appropriate through hole 621 and let the open end snap fit with the notch 641, so as to achieve the fixation of the U-shaped connector 64 on the right-angle connector 62, so that the closed end of the U-shaped connector 64 completely covers and fixes the air duct 4.

[0041] Compared with the first embodiment, this embodiment does not need to use auxiliary tools such as wrenches to adjust the bolts, so it is more convenient to use.

[0042] The above is only an embodiment of the utility model. The utility model is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A gas stabilization system in an STC furnace, comprising an STC furnace, a mixed gas pipeline, and an ignition device, characterized in that: The inlet of the STC furnace is located at the bottom of the STC furnace and is completely open, and the outlet of the mixed gas pipeline is arranged opposite to the inlet of the STC furnace; It also includes an air duct connected to the mixed gas duct, on which a manual valve, a solenoid valve and a flow meter are arranged in sequence according to the air flow direction, the flow meter is arranged vertically, and fixing devices for fixing the air duct are arranged at positions near the inlet and outlet of the flow meter on the air duct, and the fixing devices are detachable.

2. The STC furnace gas stabilization system according to claim 1, characterized in that: It also includes a three-way valve, the mixed gas pipeline includes a first mixed gas pipeline and a second mixed gas pipeline, the three-way valve is connected to the air pipeline, the first mixed gas pipeline, and the second mixed gas pipeline respectively, and the other end of the second mixed gas pipeline away from the three-way valve is arranged opposite to the inlet of the STC furnace.

3. The STC furnace gas stabilization system according to claim 2, characterized in that: The fixing device comprises a fixing plate, a right-angle connector fixedly connected to the fixing plate, and a clamp used for detachably connecting the air duct and the right-angle connector.

4. The STC furnace gas stabilization system according to claim 2, characterized in that: The fixing device includes a fixing plate, a right-angle connector fixedly connected to the fixing plate, and a U-shaped connector detachably connected to the right-angle connector. Notches are arranged on both sides of the U-shaped connector, and a through hole that snaps into place with the notch is arranged on the fixing plate.

5. The STC furnace gas stabilization system according to claim 4, characterized in that: A spike portion is fixedly arranged at the end of the U-shaped connecting piece.

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