CN213237510U

CN213237510U - Natural gas spray gun structure for float kiln production line kiln

Info

Publication number: CN213237510U
Application number: CN202021274409.XU
Authority: CN
Inventors: 汪兵; 秦华明; 张江涛; 张�浩; 乔毛毛
Original assignee: CSG Holding Co Ltd; Xianning CSG Glass Co Ltd
Current assignee: CSG Holding Co Ltd; Xianning CSG Glass Co Ltd
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2021-05-18
Anticipated expiration: 2030-07-02

Abstract

The utility model provides a natural gas spray gun structure for float kiln production line kiln belongs to float glass production facility technical field. Comprises a gas channel, a combustion-supporting air channel wrapped outside the gas channel and a cooling air channel wrapped outside the combustion-supporting air channel; the outer wall of the gas channel is provided with a first spiral guide sheet, the outer wall of the combustion-supporting air channel is provided with a second spiral guide sheet, the tail end of the gas channel is sealed, and the wall of the gas channel is evenly provided with a plurality of overflow holes. The utility model has the advantages of the natural gas utilization ratio is higher.

Description

Natural gas spray gun structure for float kiln production line kiln

Technical Field

The utility model belongs to the technical field of float glass production facility, a natural gas spray gun structure that float kiln production line kiln was used is related to.

Background

For the production process of a float ash glass production line, the melting temperature of a working part of a melting furnace needs to be further improved, in order to meet the melting requirement, a method of introducing combustion-supporting air is generally adopted, the existing mode is that a large speed difference is formed between natural gas and the combustion-supporting air, so that the middle part of flame sprayed into the melting furnace is in an anoxic state, methane cracking and carbon precipitation are facilitated, but the mode also has the defects that flame climbing can be caused by the middle part of the flame due to the anoxic state, the length of the flame is lengthened, the position acting on the bottom of the melting furnace is the end part of the flame, other parts are not fully utilized except for heat accumulation of a combustion area, in addition, the gas flow rate is too fast, the pressure is too large, the length of the flame is further increased, and the utilization rate of natural gas of a spray; according to different conditions of the kiln, the spray gun also needs to be controlled in real time, the safety performance is controlled, and the like, and the control is an important part of the combustion of the natural gas spray gun of the melting kiln of the float ash glass production line.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a natural gas spray gun structure that float process kiln production line kiln used to the above-mentioned problem that prior art exists, the utility model aims to solve the technical problem of how improve the utilization ratio of natural gas.

The purpose of the utility model can be realized by the following technical proposal: a natural gas spray gun structure for a float kiln production line kiln is characterized by comprising a gas channel, a combustion-supporting air channel wrapped outside the gas channel and a cooling air channel wrapped outside the combustion-supporting air channel; the outer wall of the gas channel is provided with a first spiral guide sheet, the outer wall of the combustion-supporting air channel is provided with a second spiral guide sheet, the tail end of the gas channel is sealed, and a plurality of overflow holes are uniformly distributed in the wall of the gas channel.

The first spiral guide vane guides, buffers and prolongs the path of the air flow of the combustion-supporting air, so that the combustion-supporting air can be fully mixed with the high-pressure natural gas extruded from the overflow hole, and the mixing process is as follows: the natural gas spraying direction is perpendicular to the combustion-supporting air flow direction, and the gas mixing ratio is gradually increased in the process that combustion-supporting air flows from the inlet to the outlet of the first spiral guide vane until the tail end of the combustion-supporting air channel reaches the final value of the gas mixing ratio. The benefits of this approach are: in the mixing process of natural gas and air, if the natural gas is added into the mixing process of air at one time, natural gas particles are easy to gather and agglomerate, so that the gas is not mixed uniformly, and after the natural gas is subjected to component through the overflow holes, the natural gas can be mixed with combustion-supporting air in a state of intercepting the combustion-supporting air, the amount of the natural gas is gradually increased, a small amount of mixed gas with a small natural gas ratio is formed after the natural gas and the air are mixed, the natural gas is heated gradually and again after the mixed gas is mixed uniformly, the mixing is carried out again, and the process is repeated, so that the mixing of the gas can be more uniform.

By the mode, the pressure of the airflow sprayed from the tail end of the spray gun is reduced, the flame length is relatively shortened, and the combustion is more sufficient.

In the above natural gas spray gun structure for the float kiln production line, the inlet of the cooling air channel is located at the tail end of the cooling air channel, the inlet of the combustion-supporting air channel is connected with an air inlet connecting pipe, and the outlet of the cooling air channel is provided with a cooling air outlet pipe wrapped outside the air inlet connecting pipe.

The cooling air is flowed from the entrance by the terminal entering of combustion-supporting wind passageway, preheats the gas that gets into the gas passageway, can improve the heat utilization efficiency under the prerequisite of cooling down to the spray gun.

In order to increase the cooling effect of the cooling air on the spray gun, a second spiral guide vane is arranged on the outer wall surface of the fuel gas channel, so that the cooling path and the preheating of the fuel gas are prolonged.

In the above natural gas spray gun structure for the float kiln production line, the tail end of the gas channel is provided with a contraction guide part.

The contraction guide part corrects and guides the airflow of the mixed gas, and corrects the path of the mixed gas coming out of the first spiral guide vane so as to enable the flame to be straight.

Drawings

Fig. 1 is a schematic configuration diagram of the present control system.

Fig. 2 is a schematic view of the structure of the spray gun.

Fig. 3 is a schematic view of the structure of fig. 2 after the gas channel is cut.

In the figure, 1, a spray gun; 21. a gas channel; 22. a combustion-supporting air passage; 23. a cooling air passage; 31. a first spiral guide vane; 32. a second spiral guide vane; 33. an overflow aperture; 34. An air inlet connecting pipe; 35. a cooling air outlet pipe; 36. a contraction guide portion; 4. a gas pipeline; 41. A first manual gate valve; 42. a first pressure gauge; 43. a pressure maintaining valve; 44. a first undervoltage switch; 45. a first overvoltage switch; 46. a first pressure transmitter; 47. a first orifice plate flow meter; 48. a pneumatic membrane regulating valve; 49. cutting off the electromagnetic valve; 5. a combustion air duct; 51. a second manual gate valve; 52. a second undervoltage switch; 53. a second pressure transmitter; 54. a second orifice flowmeter; 55. an electric control valve; 56. a second pressure gauge; 6. a cooling air duct; 61. a third manual gate valve; 62. a third pressure gauge; 7. a centrifugal fan.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1 and 2, the gas-fired lance-cooling system comprises a lance 1, a gas pipeline 4, a combustion-supporting air pipeline 5 and a cooling air pipeline 6, wherein the lance 1 comprises a gas channel 21, a combustion-supporting air channel 22 wrapped outside the gas channel 21 and a cooling air channel 23 wrapped outside the combustion-supporting air channel 22; the tail end of the gas channel 21 is connected with the gas channel 21, the tail end of the gas pipeline 4 is connected with the combustion-supporting air channel 22, the tail end of the cooling air pipeline 6 is connected with the cooling air channel 23, a first manual gate valve 41, a first pressure gauge 42, a pressure stabilizing valve 43, a first under-pressure switch 44, a first over-pressure switch 45, a first pressure transmitter 46, a first orifice plate flowmeter 47, a pneumatic film regulating valve 48 and a cut-off electromagnetic valve 49 are sequentially arranged on the gas pipeline 4 along the gas through-flow direction, a second manual gate valve 51, a second under-pressure switch 52, a second pressure transmitter 53, a second orifice plate flowmeter 54, an electric regulating valve 55 and a second pressure gauge 56 are sequentially arranged on the combustion-supporting air pipeline 5 along the through-flow direction of the combustion-supporting air, and a third manual gate valve 61 and a third pressure gauge 62 are sequentially arranged on the cooling; the inlet ends of the cooling air pipeline 6 and the fuel gas channel 21 are connected in parallel and then connected with a centrifugal fan 7.

When the first undervoltage switch 44 and the first overvoltage switch 45 detect undervoltage or overvoltage, the cut-off solenoid valve 49 is in a cut-off position; when the natural gas pressure is in the normal working range, the first under-voltage switch 44 and the first over-voltage switch 45 do not output protection signals, and when the combustion-supporting air pressure is normal, the second under-voltage switch 52 does not output protection signals, and the electric control system controls an igniter outside the tail end of the spray gun 1 to automatically ignite for 10 seconds and start normal combustion; when the ignition time is up, but the flame detector cannot detect normal flame, the cut-off electromagnetic valve 49 of the natural gas can be cut off immediately and automatically, so that the natural gas is prevented from leaking; during combustion, according to the mixing ratio of the natural gas flow and the combustion-supporting air set by the upper computer, the PLC automatically controls the opening degrees of the pneumatic film regulating valve 48 of the natural gas and the electric regulating valve 55 of the combustion-supporting air through the data detected by the first pressure transmitter 46, the second pressure transmitter 53, the first orifice plate flowmeter 47 and the second orifice plate flowmeter 54 by an edited PID program, so that stable flow combustion is ensured, and the influence of natural gas supply pressure fluctuation is avoided; when unexpected situations such as natural gas cut-off, flameout and the like occur midway, the system can cut off the cut-off electromagnetic valve 49 of the natural gas and send alarm information after the judgment according to signals of the pressure switch and the flame detector.

The electric control system consists of a flame controller, a Siemens 300 system PLC, an industrial personal computer, a low-voltage electric appliance and the like. Before normal operation, the mixing ratio of the natural gas flow and the combustion-supporting air is set in the upper computer, the natural gas and combustion-supporting air manual gate valve is opened, and after the control system detects the pressure of the natural gas and the combustion-supporting air, the electromagnetic valve 49 is cut off and opened, and automatic ignition is performed to start combustion. In the combustion process, the natural gas flow or the combustion-supporting air ratio can be modified on an upper computer according to the process condition. When the accidents such as ignition failure, natural gas interruption, flameout in midway and the like occur, the cut-off electromagnetic valve 49 can automatically cut off the natural gas pipeline and give an alarm, so that the natural gas is prevented from leaking to cause safety accidents.

As shown in fig. 2 and 3, the outer wall surface of the gas channel 21 is provided with a first spiral guide vane 31, the outer wall of the combustion-supporting air channel 22 is provided with a second spiral guide vane 32, the end of the gas channel 21 is sealed, and the wall surface of the gas channel 21 is evenly provided with a plurality of overflow holes 33.

The first spiral guide vane 31 guides, buffers and prolongs the path of the combustion-supporting air flow, so that the combustion-supporting air can be fully mixed with the high-pressure natural gas extruded from the overflow hole 33, and the mixing process is as follows: the natural gas spraying direction is perpendicular to the combustion-supporting air flow direction, and in the process that combustion-supporting air flows from the inlet to the outlet of the first spiral guide vane 31, the gas mixing ratio is gradually increased until the tail end of the combustion-supporting air channel 22 reaches the final value of the gas mixing ratio. The benefits of this approach are: in the mixing process of natural gas and air, if the natural gas is added into the mixing process of the natural gas and the air at one time, natural gas particles are easy to gather and agglomerate, so that the gas is not mixed uniformly, the natural gas is subjected to component division through the overflow holes 33, the natural gas can be mixed with combustion-supporting air in a state of intercepting the combustion-supporting air, the amount of the natural gas is gradually increased, a small amount of natural gas and the air are mixed to form mixed gas with a small natural gas ratio, the natural gas is heated gradually and again after the mixed gas is mixed uniformly, and the mixing is repeated, so that the gas can be mixed more uniformly.

In this way, the pressure of the airflow sprayed from the tail end of the spray gun 1 is reduced, the flame length is relatively shortened, and the combustion is more sufficient.

The inlet of the cooling air channel 23 is located at the tail end of the cooling air channel 23, the inlet of the combustion-supporting air channel is connected with an air inlet connecting pipe 34, and the outlet of the cooling air channel is provided with a cooling air outlet pipe 35 wrapped outside the air inlet connecting pipe 34.

The cooling air is flowed out from the entrance by the end entering of combustion-supporting wind passageway 22, preheats the gas that gets into gas passageway 21, can improve the heat utilization efficiency under the prerequisite of cooling down to spray gun 1.

In order to increase the cooling effect of the cooling air on the spray gun 1, a second spiral guide vane 32 is arranged on the outer wall surface of the fuel gas channel 21, so that the cooling path and the preheating of the fuel gas are prolonged.

The gas channel 21 terminates with a converging guide 36. The contraction guide 36 corrects and guides the flow of the mixed gas, and corrects the path of the mixed gas coming out of the first spiral guide 31 so that the flame is flat.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A natural gas spray gun structure for a float kiln production line kiln is characterized by comprising a gas channel (21), a combustion-supporting air channel (22) wrapped outside the gas channel (21) and a cooling air channel (23) wrapped outside the combustion-supporting air channel (22); the outer wall surface of gas passageway (21) has first spiral guide vane (31), the outer wall of combustion-supporting wind passageway (22) has second spiral guide vane (32), the end of gas passageway (21) seals, the equipartition has a plurality of overflow holes (33) on the wall surface of gas passageway (21).

2. The natural gas spray gun structure for the float kiln production line kiln according to claim 1, wherein the inlet of the cooling air channel (23) is positioned at the tail end of the cooling air channel (23), the inlet of the combustion-supporting air channel is connected with an air inlet connecting pipe (34), and the outlet of the cooling air channel is provided with a cooling air outlet pipe (35) wrapped outside the air inlet connecting pipe (34).

3. The structure of a natural gas injection lance for a float furnace line kiln according to claim 1 or 2, wherein the end of the gas channel (21) has a constricted guide portion (36).