Gas and natural gas switching supply device

Abstract

The utility model relates to a gas and natural gas switching supply device. A coal gas booster fan and a flue gas induced draft fan are arranged to be the same equipment, a mixing chamber is arranged on a gas conveying pipeline, a control valve on a coal gas pipeline is opened, control valves on a natural gas pipeline and a circulating flue gas pipeline are closed, the fan is a coal gas booster, and coal gas is pressurized and conveyed to a combustor for combustion; the control valve on the gas pipeline is closed, the control valves on the natural gas pipeline and the circulating flue gas pipeline are opened, the fan is a flue gas induced draft fan, flue gas is introduced into the mixing chamber to be mixed with natural gas, diluted and conveyed to the combustor for combustion, and the purpose that the same gas supply device conveys different kinds of fuel gas is achieved. The utility model has the advantages of compact structure, wide application, energy conservation, high efficiency, environmental protection and the like.

Description

Technical Field

[0001] The utility model relates to a switchable gas supply device, in particular to a gas supply device capable of switchably supplying coal gas and natural gas, belonging to the gas transportation technology. Background Art

[0002] Large gas heating furnaces usually use coal gas or natural gas as fuel to raise the temperature of the workpiece to meet the process requirements. Traditional gas furnaces are designed according to the type of gas when they are designed and manufactured. Due to the limitations of gas supply equipment, heating furnaces using coal gas can only burn coal gas, and heating furnaces using natural gas can only burn natural gas. However, the supply and price of gas resources in the market are constantly changing. Using natural gas alone can sometimes result in excessively high prices, increase production costs, and in special cases, supply restrictions may occur, thus affecting production; using coal gas alone can sometimes result in supply and demand contradictions. Therefore, companies with large gas consumption hope to switch between natural gas and coal gas, which can not only solve the contradiction between gas supply and demand, but also minimize production costs. Summary of the invention

[0003] In order to solve the problems raised in the background technology, the utility model proposes a gas and natural gas switching gas supply device, which sets the booster fan and the induced draft fan as the same equipment, sets a mixing chamber on the gas transmission pipeline, and uses the opening and closing of the valve to switch the gas source configuration, so as to achieve the purpose of conveying different fuel gases by the same gas supply device.

[0004] In order to achieve the above-mentioned purpose, the utility model proposes a gas supply device for switching between coal gas and natural gas, comprising: a heating furnace, a gas pipeline and a control valve, wherein the gas pipeline comprises a coal gas pipeline, a natural gas pipeline and a flue gas pipeline, wherein the coal gas pipeline supplies coal gas to the heating furnace, the natural gas pipeline supplies natural gas to the heating furnace, the flue gas pipeline comprises a flue gas exhaust pipeline, and the flue gas exhaust pipeline discharges the flue gas generated by the heating furnace, and the utility model is characterized in that:

[0005] A fan and a mixing chamber are arranged on the gas transmission pipeline;

[0006] The smoke duct also includes a circulating smoke duct, which is connected to the smoke exhaust duct;

[0007] The gas pipeline and the circulating flue gas pipeline are respectively connected to the air inlet of the fan;

[0008] The air outlet of the fan and the natural gas pipeline are respectively connected to the air inlet of the mixing chamber;

[0009] The air outlet of the mixing chamber is connected to the burner of the heating furnace;

[0010] The coal gas pipeline, circulating flue gas pipeline and natural gas pipeline are respectively provided with control valves;

[0011] The control valve on the gas pipeline is opened, the control valves on the natural gas pipeline and the circulating flue gas pipeline are closed, and the fan is a gas booster, which boosts the gas and delivers it to the burner for combustion;

[0012] The control valve on the coal gas pipeline is closed, and the control valves on the natural gas pipeline and the circulating flue gas pipeline are opened. The fan is a flue gas induced draft fan, which introduces the flue gas into the mixing chamber, mixes with the natural gas, dilutes it, and transports it to the burner for combustion.

[0013] Preferably, when the temperature of the natural gas entering the mixing chamber is 20°C and the pressure is 6-9Kpa, and the temperature of the flue gas is 450°C and the pressure is 2-4Kpa, the volume of the natural gas and the flue gas is mixed at a ratio of 1 to 12-15 to form diluted natural gas.

[0014] Furthermore, the temperature of the flue gas entering the mixing chamber is ≤450°C.

[0015] This design sets the gas booster fan and the flue gas induced draft fan as the same equipment, sets a mixing chamber on the gas transmission pipeline, opens the control valve on the gas pipeline, closes the control valves on the natural gas pipeline and the circulating flue gas pipeline, and the fan is a gas booster to pressurize the gas and deliver it to the burner for combustion; closes the control valve on the gas pipeline, opens the control valves on the natural gas pipeline and the circulating flue gas pipeline, and the fan is a flue gas induced draft fan to introduce the flue gas into the mixing chamber to mix with the natural gas for dilution and deliver it to the burner for combustion.

[0016] The utility model has the advantages of compact structure, wide application, energy saving, high efficiency and environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 This is a switching principle diagram of the utility model.

[0018] In the attached drawings, 1 is a circulating flue gas duct, 2 is a coal gas duct, 3 is a natural gas duct, 4 and 4' are connecting ducts, 5 is an exhaust gas duct, 6 is a first control valve, 7 is a second control valve, 8 is a third control valve, A is a fan, B is a mixing chamber, C is a heating furnace, and C1 is a burner. DETAILED DESCRIPTION

[0019] As attached Figure 1 As shown, when coal gas is used, the second control valve 7 on the coal gas pipeline 2 is opened, the third control valve 8 on the natural gas pipeline 3 and the first control valve 6 on the circulating flue gas pipeline 1 are closed, and the fan A is a gas booster, which pressurizes the coal gas delivered from the coal gas pipeline 2 and delivers it to the burner C1 through the connecting pipeline 4, the mixing chamber B and the connecting pipeline 4'.

[0020] When natural gas is used, the second control valve 7 on the coal gas pipeline 2 is closed, the third control valve 8 on the natural gas pipeline 3 and the first control valve 6 on the circulating flue gas pipeline 1 are opened, and the fan A is a flue gas induced draft fan, which introduces the flue gas into the mixing chamber B through the connecting pipeline 4 to be mixed and diluted with the natural gas, and then transported to the burner C1 through the connecting pipeline 4'.

[0021] The flue gas generated by the combustion of the gas through the burner C1 in the heating furnace C is discharged from the exhaust gas duct 5. When natural gas is used, the flue gas in the exhaust gas duct 5 enters the fan A through the circulating flue gas duct 1. When coal gas is used, the flue gas in the exhaust gas duct 5 is discharged.

Claims

1. A gas supply device for switching between coal gas and natural gas, comprising: A heating furnace, a gas pipeline and a control valve, wherein the gas pipeline includes a coal gas pipeline, a natural gas pipeline and a flue gas pipeline, wherein the coal gas pipeline supplies coal gas to the heating furnace, the natural gas pipeline supplies natural gas to the heating furnace, and the flue gas pipeline includes a flue gas exhaust pipeline, wherein the flue gas exhaust pipeline discharges the flue gas generated by the heating furnace, characterized in that: A fan and a mixing chamber are arranged on the gas transmission pipeline; The smoke duct also includes a circulating smoke duct, which is connected to the smoke exhaust duct; The gas pipeline and the circulating flue gas pipeline are respectively connected to the air inlet of the fan; The air outlet of the fan and the natural gas pipeline are respectively connected to the air inlet of the mixing chamber; The air outlet of the mixing chamber is connected to the burner of the heating furnace; The coal gas pipeline, circulating flue gas pipeline and natural gas pipeline are respectively provided with control valves; The control valve on the gas pipeline is opened, the control valves on the natural gas pipeline and the circulating flue gas pipeline are closed, and the fan is a gas booster, which boosts the gas and delivers it to the burner for combustion; The control valve on the coal gas pipeline is closed, and the control valves on the natural gas pipeline and the circulating flue gas pipeline are opened. The fan is a flue gas induced draft fan, which introduces the flue gas into the mixing chamber, mixes with the natural gas, dilutes it, and transports it to the burner for combustion.

2. The coal gas and natural gas switching gas supply device according to claim 1, characterized in that: When the temperature of the natural gas entering the mixing chamber is 20°C and the pressure is 6-9Kpa, and the temperature of the flue gas is 450°C and the pressure is 2-4Kpa, the volume of the natural gas and the flue gas is mixed at a ratio of 1 to 12-15 to form diluted natural gas.

3. The coal gas and natural gas switching gas supply device according to claim 1, characterized in that: The flue gas temperature entering the mixing chamber is ≤450℃.

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