KR200299672Y1 - Multipurpose backfire prevention apparatus and system for supplying brown gas largely - Google Patents

Abstract

The present invention relates to a multipurpose flashback prevention device and a brown gas mass supply system for stably supplying brown gas produced in a large amount in a brown gas plant to an industrial boiler, a melting furnace, a heating furnace, and the like.

The present invention consists of a first system in which hexane is mixed in the form of vapor in the brown gas and a second system in which air is mixed by the brown gas air mixer to delay the combustion speed of the brown gas. In particular, a safety valve valve was mounted on the upper part of the flashback arrester to discharge the ignition pressure, and a hexane automatic feeder was configured in the frame modifier to enable continuous operation.

The multi-purpose flashback prevention device and brown gas mass supply system equipped with such a flashback prevention device satisfy the essential conditions for stably supplying a large amount of brown gas to industrial furnaces, boilers, etc. as brown gas is used as an alternative energy. It is made.

Description

Multipurpose backfire prevention apparatus and system for supplying brown gas largely}

The present invention relates to a multipurpose flashback prevention device and a brown gas mass supply system for stably supplying brown gas produced in a large amount in a brown gas plant to an industrial boiler, a melting furnace, a heating furnace, and the like.

Brown gas refers to a gas in which hydrogen and oxygen produced by electrolysis of water are mixed in a chemical equivalent ratio of 2: 1.

Brown gas has the advantage that it does not need to put air into the combustion chamber because it is completely burned by its own oxygen, there is no need for a combustion air supply device and a chimney, but there is a disadvantage that backfire occurs well.

In order to solve the problem of Brown Gas, the applicant has already applied for a Brown Gas flashback prevention device (Utility Model Registration No. 185304, Patent Application No. 1999-0044793) (hereinafter referred to as a patent).

According to the summary of the cited patent, "the overall configuration of the present invention is a gas coupler for collecting Brown gas generated in several Brown gas generators; A fresh bag arrester for passing brown gas collected in the gas coupler; A drain catch to remove moisture contained in the gas conveyed from the fresh bag arrester; Two frame modifiers for selectively receiving the gas passing through the drain catch, and a burner for burning the gas supplied from the frame modifier, gas supply by each of the above components, and starting and stopping of the brown gas generator. Is a Brown Gas Flashback Arrestor which is composed of a system for integrated control by a pressure control loop. ”

However, when a large amount of brown gas is supplied to a furnace of a steelmaking plant or a kiln of a cement plant to be used in a brown gas combustion promotion system, the amount of gas supplied from the brown gas plant amounts to 60,000 l / h to 200,000 l / h. The flashback prevention device according to the patent consumes a large amount of hexane solution which is used as a flashback prevention solution, and in this case, if the flashback occurred because the hexane solution was not replenished, improvisation damaged the freshbag arrester or frame modifier. It is a problem because it can lead to the risk of being damaged.

The reason is that when the amount of Brown gas used is small, the destructive force is not large due to the phenomenon of the phenomenon, and even if there is no problem, the destructive force also increases because the amount of energy increases when the amount is large.

Therefore, an object of the present invention is to propose a multipurpose flashback prevention device and a brown gas mass supply system capable of safely supplying brown gas even when a large amount of brown gas is supplied.

The present invention for proposing a brown gas mass supply system must consider brown gas's unique implications. The brown gas generator produces about 1860 liters of brown gas with one liter of water. Conversely, burning 1860 liters of Brown's gas in a sealed pressure vessel by sparking, as shown in Figure 8, results in an instantaneous pressure drop as soon as the pressure peak reaches 0.5 MPa for 44 milliseconds of explosion duration. At the same time as the inner width, the volume decreases to 1/860 to form the degree of vacuum. That is, one liter of water is produced again, and the remaining volume becomes a vacuum state. This is described as Implosion, a completely different concept from Explosion.

Looking at the phenomenon, it can be seen that it is relatively safe if it has durability that can withstand the maximum pressure (0.5 MPa) at the moment of explosion. The reason for this is that the breakdown force is not large because the vacuum state is disappeared as soon as a small quench pressure is generated at too short a moment (44 kPa).

In fact, if the experiment was conducted with BS-2000 model that produced 2000ℓ / h of Brown gas generator model, the backfire prevention device was not damaged.

However, even if the peak pressure (0.5 MPa) during the implantation is low, the large amount of energy in the case of a large capacity is increased as the amount of energy increases, so it shows a great breaking force. Therefore, the present invention is designed to ensure safety by mounting a pressure spring type safety valve valve capable of discharging the instantaneous pressure on an upper portion of the flashback arrester.

The next thing to consider to prevent backfire is that flashback occurs more quickly with fuel with faster combustion rates.

Combustion rate of combustion gas mixed with gas is 297 cm / s for hydrogen, 154 cm / s for acetylene, 43 cm / s for propane, and 39 cm / s for hexane.

The magnitude of the combustion rate is greatly influenced by the concentration of the mixed gas within the flammable limits. It is also greatly affected by the type and amount of inert gas in the mixed gas. Maximum when pure oxygen is used as oxidant. For example, the hydrogen / oxygen mixed gas is 1,400 cm / s and the acetylene / oxygen mixed gas is 1,140 cm / s, which increases the combustion speed by about 5 to 7 times compared to the air mixed gas.

When the oxygen fraction in the oxidant is changed, the combustion rate is changed depending on the oxygen concentration. The rate at which the oxygen concentration is 0.21 is compared to the highest near the equivalence ratio concentration, and becomes smaller than that.

Therefore, it can be seen that mixing air with Brown gas, which is a mixture of pure hydrogen and oxygen, delays the combustion speed and prevents backfire.

Meanwhile, the cited patent also solves the backfire problem by delaying the combustion rate by passing brown gas through the hexane solution and mixing a small amount of hexane into the brown gas.

However, since the hexane solution is consumed in proportion to the amount of brown gas used, the consumption of hexane cannot be ignored in the case of a large amount. Therefore, in order to prevent backfire without passing through a frame modifier that consumes hexane, the present invention mixes compressed air with brown gas to delay combustion speed and at the same time blows brown gas into the combustion chamber at high speed so that the backfire is fundamentally prevented. It is to prevent.

The present invention is to use the alternative energy Brown Gas as fuel for industrial boilers, furnaces, etc. by completely solving the problem of backfire of Brown Gas. Also, large boiler using cheap low quality fuel such as bunker-C oil and coal (pulverized coal). In order to reduce enormous fuel costs by injecting brown gas into a combustion chamber such as a heating furnace to promote combustion, the incomplete combustion portion is led to complete combustion.

Therefore, the present invention is configured to be operated in two systems according to the purpose of using Brown Gas,

The first system passes the brown gas supplied from the brown gas plant through the fresh bag arster, passes through the frame modifier so that a small amount of hexane is mixed in the vapor state, and then the brown gas air mixer is shut off with compressed air. Brown gas supply line to pass through and burn by brown gas burner,

The second system sends brown gas that passed through the fresh bag arrester to the brown gas air mixer using compressed air instead of sending it to the frame modifier to increase the blowing pressure to prevent backfire and at the same time to delay the combustion rate by mixing a certain amount of air. It is a system configured to prevent backfire at source.

The second system is to increase the injection pressure by the compressed air in consideration of the low operating pressure of the Brown gas generator is less than 1kg / cm ² and to prevent double backfire by mixing a predetermined air in Brown gas. .

In addition, since the flashback arrester is to finally prevent backfire, the flange is attached to the upper part of the main body to form a top plate with a blind flange to seal it, and to be sealed by spring pressure by mounting a spring on the flange bolt to ensure safety. It was to play a role.

In addition, the multi-purpose flashback prevention device according to the present invention is to use a variety of industrial boilers, heating furnaces, etc. It is necessary to have a system that can be automatically operated 24 hours to enable continuous operation. In this regard, hexane is supplied so that the upper and lower water levels in the main body tank of the frame modifier maintain a constant level, but a service tank considering the internal pressure and an automatic supply device by the pressure tank should be provided.

In addition, when using the brown gas supply system for a furnace, a melting furnace, a kiln, etc., which uses brown gas as a fuel, when the preheating is performed for the first time to operate the furnace, the first system line is operated to light a burner, When the temperature inside the furnace rises above a certain temperature, the first system line is shut off and the second system line is operated to achieve the purpose of heating by Brown Gas while preventing the backfire completely without consuming hexane.

1 is a system diagram showing an entire system of the present invention.

Figure 2 is a perspective view illustrating a configuration state of the flashback prevention device of the present invention.

Figure 3 is a perspective view of the fresh bag arrester is a component of the present invention.

Figure 4 is a detailed cross-sectional view showing a safety valve valve which is one component of the present invention.

5 is a perspective view of a hexane automatic supply device and a frame modifier that is a component of the present invention.

Figure 6 is an assembly cross-sectional view of the Brown Gas air mixer which is a component of the present invention.

Figure 7 is an assembly cross-sectional view of a brown gas burner that is one component of the present invention.

Fig. 8 is an explanatory diagram showing the diffusion characteristics of Brown gas.

<Description of the symbols for the main parts of the drawings>

10: Brown gas plant 15, 16: solenoid valve

20: Freshback arrester 21, 22: inlet, outlet valve

23: water hole 24: pressure gauge

25: face gauge 26: dip tube

27: gas dispersion pipe 30: safety valve valve 31: lower flange 32: top plate 33: flange bolt nat 34: packing 35: pressure spring 40: frame modifier 41: water level sensor 42: immersion pipe 43: gas dispersion pipe 44: hexane Liquid gauge 45: Hexane inlet 50: Hexane automatic feeder 51: Hexane supply pump 52: Pressurized tank 53: Upper pressure switch 54: Lower pressure switch 55, 56: Solenoid valve 60: Brown gas air mixer 61: Brown gas inlet chamber 62 : Brown gas inlet 63, 64: Flange 65: Diffuser

70: compressor 71: compressed air nozzle

80: brown gas burner 81: burner housing

82: injection nozzle 83: cooling air inlet

84: fixed flange 90: combustion chamber

Hereinafter, with reference to the accompanying drawings for the multi-purpose Brown gas mass supply system according to the present invention will be described in detail.

As shown in FIGS. 1 to 7, the multipurpose flashback prevention device and the brown gas mass supply system according to the embodiment of the present invention can use two systems by the solenoid valves 15 and 16, and the first system While passing a large amount of brown gas supplied from the brown gas plant 10 through the fresh bag arrester 20 and passing through a frame modifier 40 containing hexane as a flashback preventing liquid, a small amount of hexane is vapor in the form of brown gas. It is a system configured to be passed to the Brown gas burner 80 through the Brown gas air mixer 60 while being mixed in and blocked the compressed air line by the solenoid valve (67).

In addition, the second system does not send brown gas to the frame modifier 40 after passing the brown gas through the fresh bag arrester 20, but directly to the brown gas air mixer 60, and then to the brown gas by the compressed air supplied from the compressor 70. The brown gas filled in the gas inlet chamber 61 is blown into the combustion chamber by the brown gas burner 80 while being mixed with air while being transported at high speed by the diffuser 65.

The fresh bag arster 20 is filled with a liquid gauge 25 for managing water to maintain a constant amount by filling the water in the body, and the upper plate 32 mounted on the upper portion of the main body (23) and pressure gauge (24) is installed and the inlet valve (21) is opened when brown gas is supplied to the gas distribution pipe (27) located on the lower surface along the immersion pipe (26) to form a small bubble through a plurality of small holes there Rise above the surface of the water Brown gas collected on the water surface is supplied to the next accessory device through the outlet valve 22.

The flashback arrester 20 according to the present invention is characterized in that the safety valve 30 is installed so that if the backfire occurs, the brown gas collected at the top of the main body can discharge the ignition energy emitted while burning at once. .

The safety valve 30 is formed by attaching a lower flange 31 to the upper portion of the fresh bag arrester 20 and forming a top plate 32 with a corresponding blend flange, thereby packing between the lower flange and the top plate ( 34) Inserted separately prepared by the flange bolt nut 33 is equipped with a pressure spring (35) is prepared to be completely sealed by the pressure of the spring (35).

The frame modifier 40 has a hexane liquid gauge 44 on the side of the body so as to fill the hexane with a flashback preventing solution, a hexane inlet 45 on the upper side thereof, and a water level sensor 41 is operated to operate. Brown gas supplied from the hexane solution through the immersion pipe 42 and the gas dispersion pipe 43 is mixed with a small amount of hexane in the form of steam is collected on the upper body and then configured to supply to the outlet pipe.

The frame modifier 40 is composed of a special hexane automatic feeding device 50 to achieve the purpose of the present invention, hexane automatic feeding device 50 is hexane supplied from the hexane service tank to the hexane supply pump 51 "ON" of the solenoid valve 55 that is compressed to a predetermined pressure (about 2kg / cm ² ) or more to be stored in the pressure tank 52 and operated by the water level sensor 41 placed inside the frame modifier 40. "," OFF "This is a device for automatically supplying hexane by opening and closing.

The pressurized tank 52 is provided with an upper limit pressure switch 53 and a lower limit pressure switch 54 so that the solenoid valve 56 is operated by operating the lower limit pressure switch 54 at a constant pressure (about 2 kg / cm ² ). When the hexane supply pump 51 is operated and reaches a constant pressure (about 2.5 kg / cm ² ), the solenoid valve 56 is closed by the upper limit pressure switch 53 to stop the pump.

Brown gas air mixer 60 for achieving the object of the present invention is a body having a brown gas inlet chamber 61 is formed on one side of the brown gas inlet 62 and the center forming a 90 ° with the inlet 62 The compressed air nozzle 71 is assembled on one side of the line by the full range 63, and the connecting pipe 72 is assembled. On the other side of the center line, the inlet diffuser 65a, the slot 65b and The diffuser 65 formed of the outlet diffuser 65c is integrally assembled by the flange 64.

The brown gas air mixer 60 blows compressed gas supplied from the compressor 70 by the nozzle 71 and sucks the brown gas filled in the brown gas inlet chamber 61 by the injection kinetic energy to diffuser. By 65, it is a device which transfers to a combustion chamber with high energy.

The brown gas burner 80 of the present invention is a device for blowing brown gas deep into the combustion chamber 90 while preventing backfire, and is installed inside the burner housing 81 and the burner housing fixed to the combustion chamber outer wall by the flange 84. It is composed of a spray nozzle 82 is assembled and fixed to form a predetermined gap between the spray nozzle 82 and the housing 81 so that the spray nozzle 82 is not overheated by the compressed air supplied to the cooling air inlet 83 The brown gas burner 80 is assembled to the Brown gas air mixer 60 by a flange 85, and the brown gas mixed with air at a predetermined ratio in the air mixer 60 is burner 80. It is configured so that the burner tip 86 does not catch fire by spouting into the combustion chamber 90 at a high speed so as not to cause backfire at source.

The present invention relates to a multipurpose flashback prevention device and a brown gas mass supply system. The first system for incorporating hexane in the form of steam into brown gas in order to retard the combustion speed of brown gas and the air mixing agent by the brown gas air mixer The system consists of two systems. In particular, the present invention is designed to prevent backfire into double and triple by constructing safety valve valve to discharge discharge pressure safely even if the backfire occurs by applying the unique characteristic of Brown Gas. Was achieved.

This multi-purpose flashback prevention device and the brown gas mass supply system enable brown gas to be stably supplied to industrial furnaces, boilers, etc. as brown gas is used as an alternative energy, and to heat kilns or steel mills in cement plants. In a large facility such as a furnace, the brown gas combustion promotion system was used to reduce enormous energy costs by promoting combustion while using low-quality fuel such as bunker-C oil and coal.

In particular, when preheating of industrial furnaces, melting furnaces, etc. is required, if the preheating system is sufficiently preheated using the first system of the present invention and the temperature rises to a certain temperature, the second system is used for continuous operation. It is a very useful design that can be operated with.

Claims (5)

The brown gas supplied from the brown gas plant 10 is passed through the fresh bag arster 20, and then passed through the frame modifier 40 so that a small amount of hexane is mixed into the brown gas in the form of steam. Brown gas passing through the fresh bag arrester 20 and the brown gas passing through the fresh bag arster 20 directly to the brown gas air mixer 60 without being directly sent to the brown gas air mixer 60 is mixed with air. A second system configured to be sent to a gas burner (80), and a multipurpose flashback prevention apparatus and brown gas mass supply system, characterized in that the first system and the second system are configured to be selectively operated according to the purpose of use. The method of claim 1, The flashback arrestor 20 for preventing flashback forms a lower flange 31 and an upper plate 32 on an upper portion of the main body, and puts a packing between the lower flange 31 and the upper plate 32, and a pressure spring 35 is provided. Multi-purpose flashback prevention device and Brown gas mass supply system, characterized in that the safety valve valve (30) is installed so as to be fastened with the flange bolt nut (33) mounted to discharge the pressure in case of emergency. The method of claim 1, The flame retardant flame modifier 40 includes a pressurized tank 52 configured to be compressed by a hexane supply pump 51 and a pump 51 to a predetermined pressure or more, and an upper pressure switch 53 attached to the pressurized tank 52 and a lower limit. The solenoid valve 55 operated by the water level sensor 41 and the water level sensor 41 placed inside the main body of the pressure switch 54 and the solenoid valve 56 operated by the pressure switch and the frame modifier 40. Multipurpose flashback prevention device and Brown gas mass supply system, characterized in that it is equipped with a hexane automatic supply device 50 configured to automatically supply hexane by opening and closing of. The method of claim 1, The backfire prevention brown gas air mixer 60 has a brown gas inlet chamber 61 as a body and a brown gas inlet 62 is formed at one side and a compressed air nozzle at one side of the center line that forms a 90 degree angle with the inlet 62. The 71 is assembled by the flange 63 and the connecting pipe 72 is assembled and formed on the other side of the center line by the inlet diffuser 65a, the slot 65b and the outlet diffuser 65c. Multi-purpose flashback prevention device and Brown gas mass supply system, characterized in that the diffuser 65 is integrally assembled by the connecting flange (64). The method of claim 1, The burner prevention brown gas burner 80 includes a burner housing 81 fixed to an outer wall of the combustion chamber 90, an injection nozzle 82 assembled to the burner housing 81, and an injection nozzle 82 inside the burner housing. It is provided with a cooling air inlet 83 for blowing a cooling air by generating a predetermined gap in the assembly and assembling it integrally to prevent overheating of the burner tip 86 as well as by the connecting flange 85 Multi-purpose flashback prevention device and Brown gas mass supply system, characterized in that the assembly with the Brown gas air mixer (60) to perform a spray function and a burner function.