CN209782995U - Flameout protection and automatic ignition device for natural gas combustion furnace of compound fertilizer plant - Google Patents
Flameout protection and automatic ignition device for natural gas combustion furnace of compound fertilizer plant Download PDFInfo
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- CN209782995U CN209782995U CN201920485320.9U CN201920485320U CN209782995U CN 209782995 U CN209782995 U CN 209782995U CN 201920485320 U CN201920485320 U CN 201920485320U CN 209782995 U CN209782995 U CN 209782995U
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Abstract
The utility model discloses a flameout protection and automatic ignition device of a natural gas combustion furnace of a compound fertilizer plant, which comprises a combustion furnace and a natural gas pipe, wherein a tubular burner is arranged in the middle of the side wall of the combustion furnace, the natural gas pipe is connected with an air inlet pipe of the burner through a manual ignition gas pipe, the manual ignition gas pipe is provided with an auxiliary manual valve, and an air inlet of the burner is also connected with a blower; the natural gas pipe is connected with the gas inlet pipe of the burner through the main electromagnetic valve after passing through the main manual valve; the natural gas pipe is also connected with an air inlet pipe of the burner through an electric ignition air pipe after passing through the main manual valve, and the electric ignition air pipe is provided with an auxiliary electromagnetic valve; the blower, the main electromagnetic valve and the auxiliary electromagnetic valve are connected with a flameout protection and ignition device. The utility model discloses can also conveniently control the flame-out time of sweeping that fires burning furnace through flame-out protection and ignition device autoignition.
Description
Technical Field
the utility model relates to a chemical fertilizer production technical field especially relates to a natural gas of compound fertilizer factory fires burning furnace flame-out protection and automatic ignition device.
background
The top of the side wall of a combustion furnace of the existing compound fertilizer plant is provided with a hot gas outlet, the hot gas outlet is connected with an induced draft fan, the top of the combustion furnace is also provided with an explosion-proof sheet, the bottom of the side wall of the combustion furnace is provided with an air inlet, the middle part of the side wall of the combustion furnace is penetrated with a burner, the outlet of the burner extends into the combustion furnace, and a natural gas pipe is connected with an air inlet pipe of the; the natural gas pipe is also connected with an air inlet pipe of the combustor through a manual ignition gas pipe, the manual ignition gas pipe is provided with an auxiliary manual valve, the natural gas pipe further comprises a first igniter, an ignition head of the first igniter is close to an outlet of the combustor, and an air inlet of the combustor is also connected with a blower;
in the normal production process of the compound fertilizer plant, if sudden flameout occurs in the natural gas combustion furnace, production workers are required to go to the site and manually ignite again according to a safe operation procedure. Hot air generated by the combustion furnace is sucked to a subsequent rotary dryer by the induced draft fan for drying moisture in the fertilizer.
the manual operation process comprises the following steps that firstly, a main manual valve is closed to cut off natural gas, then a manual fan switch HF is closed, a coil KM1-1 of a contactor is electrified, a normally open switch KM1-2 of the contactor is closed, a blower 3 is started to operate, and residual natural gas in a hearth is swept, so that flash explosion is prevented when the ignition is carried out again, further, furnace hearth damage and personal safety accidents of a combustion furnace are caused, then, after the blower 3 is manually judged to be swept for a certain time, the manual fan switch HF is switched off, the blower stops operating, after the sweeping is finished, an auxiliary manual valve used for ignition is opened again, manual re-ignition is carried out through a first igniter, and after the ignition is successful, the main manual valve is opened, and the auxiliary manual valve used for ignition is closed. The combustion effect of natural gas, namely the temperature of the hearth, is completed by manually adjusting the opening of the main manual valve. Air supplement of the combustion furnace in the combustion process is mainly sucked from an air inlet at the bottom of the side wall of the combustion furnace through a subsequent induced draft fan. And manually igniting again to restore production.
The prior art has the defect that the quality and the yield of the compound fertilizer are influenced because the temperature of a hearth is reduced due to the longer manual ignition process. In addition, in the safe operation regulation of combustion furnace ignition, the purging time is controlled manually, the residual amount of natural gas in the hearth is difficult to control, and the temperature of the hearth is reduced when the purging time is too long; the blowing time is too short, so that the hearth can be subjected to flash explosion, and further, the hearth of the combustion furnace is damaged and personal safety accidents happen. Although the top of the natural gas combustion furnace is provided with the explosion-proof plate, the damage degree of the combustion furnace hearth of the combustion furnace can be reduced only when flash explosion occurs.
SUMMERY OF THE UTILITY MODEL
In view of at least one defect of prior art, the utility model aims at providing a compound fertilizer plant natural gas fires burning furnace flame-out protection and automatic ignition, can also conveniently control the flame-out time of sweeping that fires burning furnace through flame-out protection and ignition automatic ignition.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a flameout protection and automatic ignition device of a natural gas combustion furnace of a compound fertilizer plant comprises a combustion furnace and a natural gas pipe, wherein a burner is arranged in the middle of the side wall of the combustion furnace in a penetrating manner, the outlet of the burner extends into the combustion furnace, the natural gas pipe is connected with the air inlet pipe of the burner through a manual ignition gas pipe, the manual ignition gas pipe is provided with an auxiliary manual valve, the flame-out protection and automatic ignition device also comprises a first igniter, and the ignition head of the first igniter is close to the outlet of the burner; the air inlet of the combustor is also connected with a blower, and the blower is provided with a manual blower switch HF;
The key point is that the natural gas pipe is connected with the gas inlet pipe of the burner through the main electromagnetic valve after passing through the main manual valve; the natural gas pipe is also connected with an air inlet pipe of the burner through an electric ignition air pipe after passing through the main manual valve, and the electric ignition air pipe is provided with an auxiliary electromagnetic valve;
the blower, the main electromagnetic valve and the auxiliary electromagnetic valve are connected with a flameout protection and ignition device, the flameout protection and ignition device comprises a flame monitor, and a probe of the flame monitor extends into the combustion furnace; the flame monitor is connected with an automatic control circuit; the automatic control circuit is connected with a second igniter, and an ignition needle of the second igniter is close to an outlet of the combustor; the automatic control circuit is also connected with the blower.
The flame monitor is used for detecting whether a flame signal exists at the outlet of the burner; through the arrangement of the circuit structure, the flame monitor sends a signal to the automatic control circuit after acquiring a flameout signal of the combustor, the automatic control circuit controls the main electromagnetic valve to be closed, the natural gas supply of the combustion furnace is cut off, and the automatic control circuit controls the blower to purge the natural gas in the combustion furnace; after the time is set in a delayed mode, the blower is controlled to be closed, then the auxiliary electromagnetic valve is controlled to be opened, natural gas is provided for the combustor through the electric ignition air pipe, the second igniter is controlled to be electrified and re-ignited, the main electromagnetic valve is controlled to be opened after ignition is successful, and the auxiliary electromagnetic valve is closed. The control circuit can realize the automatic ignition of the combustion furnace and conveniently control the flameout purging time of the combustion furnace.
Under automatic control, the main manual valve is in an open state, and the auxiliary manual valve is in a closed state;
in special situations, such as the situation that the automatic control circuit is damaged, the automatic control circuit can be powered off by manually igniting, and the main electromagnetic valve is in an open state when the power is off; the auxiliary electromagnetic valve is in a closed state when power is off; when manual ignition is performed, the main manual valve is closed, the manual fan switch HF is closed, the hearth of the combustion furnace is swept through the blower, after natural gas in the hearth is swept out, the manual fan switch HF is disconnected, the blower is turned off, the auxiliary manual valve is opened, natural gas is provided for the combustor through the manual ignition gas pipe, the power supply of the first igniter is manually closed, the combustor is ignited, the main manual valve is opened, and the auxiliary manual valve is closed.
The air supply quantity passing through the auxiliary manual valve and the auxiliary electromagnetic valve is smaller than the air supply quantity directly passing through the main manual valve and the main electromagnetic valve, and the auxiliary manual valve and the auxiliary electromagnetic valve are used for ignition and are not easy to generate deflagration accidents.
the automatic control circuit controls the second igniter and the auxiliary electromagnetic valve to be switched on and off through the delay breaking circuit.
Through the arrangement of the circuit structure, when the set time of the delay breaking circuit is not up, the delay breaking circuit controls the second igniter and the auxiliary electromagnetic valve to be electrified; on the contrary, when the set time of the delay breaking circuit is reached, the delay breaking circuit controls the second igniter and the auxiliary electromagnetic valve to be powered off.
Through the circuit arrangement, when the automatic control circuit and the delay breaking circuit control the second igniter to ignite unsuccessfully at one time, the second igniter and the auxiliary electromagnetic valve are controlled to be powered off. The second igniter is prevented from being ignited for multiple times, and the deflagration accident caused by successful ignition at a burst because of unsuccessful ignition for multiple times is avoided.
The automatic control circuit is provided with a manual switch QF which controls the automatic control circuit to be powered on or powered off, the automatic control circuit is provided with a first intermediate relay, a coil KA1-1 of the first intermediate relay is connected with a power supply through a normally closed switch of the flame monitor, and a main electromagnetic valve is connected with the power supply through a first normally open switch KA1-2 of the first intermediate relay;
The automatic control circuit is also provided with a first time relay, and a coil KT1-1 of the first time relay is connected with a power supply through a second normally open switch KA1-3 of a first intermediate relay;
The first end of an instantaneous closing delay switch KT1-2 of the first time relay is connected with one end of a power supply through a coil KM1-1 of a contactor, the first end of an instantaneous closing delay switch KT1-2 is also connected with the first end of a manual fan switch HF, the second end of the instantaneous closing delay switch KT1-2 and the second end of the manual fan switch HF are connected with the second end of the power supply through an alternative change-over switch K, and a normally open switch KM1-2 of the contactor controls the on-off of a blower;
the time-delay breaking circuit comprises a second time relay and a second intermediate relay, a coil KT2-1 of the second time relay is connected with a power supply through a time-delay closed switch KT1-3 of the first time relay, a coil KA2-1 of the second intermediate relay is connected with the power supply through a time-delay disconnected switch KT2-2 of the second time relay, an auxiliary electromagnetic valve is connected with the power supply through a first normally-open switch KA2-2 of the second intermediate relay, and a second igniter is connected with the power supply through a second normally-open switch KA2-3 of the second intermediate relay.
Through the circuit structure, when ignition control is needed manually, the manual switch QF is disconnected, the second end of the manual fan switch HF is connected with the alternative change-over switch K, the manual switch QF controls the automatic control circuit to be powered off, and the automatic control circuit is not ignited. A coil KM1-1 of a contactor is manually controlled to be powered on and powered off by a manual fan switch HF, and a normally open switch KM1-2 of the contactor controls the blower to be powered on and powered off.
When the automatic ignition control is needed, the manual switch QF is closed, the second end of the instantaneous closing delay disconnection switch KT1-2 is connected with the alternative change-over switch K, the manual switch QF controls the automatic control circuit to be electrified, and the automatic control circuit controls the automatic ignition. An instantaneous closing time-delay switch KT1-2 automatically controls a coil KM1-1 of a contactor to be powered on and powered off, and a normally open switch KM1-2 of the contactor controls a blower to be powered on and powered off.
The working principle of automatic control is as follows:
when a probe of the flame monitor detects a flameout signal in the combustion furnace, a normally closed switch of the flame monitor is closed, a coil KA1-1 of the first intermediate relay is electrified, a first normally open switch KA1-2 of the first intermediate relay is closed to control a main electromagnetic valve to be electrified, the main electromagnetic valve is switched from an open state to a closed state, and natural gas is cut off;
A second normally open switch KA1-3 of the first intermediate relay is closed, and a coil KT1-1 of the first time relay is electrified;
An instantaneous closing delay breaking switch KT1-2 of the first time relay is closed, a coil KM1-1 of the contactor is electrified, and a normally open switch KM1-2 of the contactor controls the blower to be electrified;
after the set purging time is delayed, an instantaneous closing delay-breaking switch KT1-2 of the first time relay is disconnected, a coil KM1-1 of the contactor is powered off, and a normally-open switch KM1-2 of the contactor is disconnected to control the power-off of the blower;
The time-delay breaking circuit comprises a second time relay and a second intermediate relay,
A time delay closing switch KT1-3 of the first time relay is closed in a time delay setting time, and a coil KT2-1 of the second time relay is controlled to be electrified;
A delay disconnecting switch KT2-2 of the second time relay is closed, a coil KA2-1 of the second intermediate relay is electrified, a first normally open switch KA2-2 of the second intermediate relay is closed, and the auxiliary electromagnetic valve is controlled to be electrified; a second normally open switch KA2-3 of the second intermediate relay is closed, and a second igniter is electrified for ignition;
If the ignition is successful, a probe of the flame monitor detects a flame signal in the combustion furnace, a normally closed switch of the flame monitor is disconnected, a coil KA1-1 of the first intermediate relay is disconnected, a first normally open switch KA1-2 of the first intermediate relay is disconnected to control a main electromagnetic valve to be disconnected, and natural gas is supplied to the combustion furnace;
a second normally open switch KA1-3 of the first intermediate relay is switched off, and a coil KT1-1 of the first time relay is switched off; a time delay closing switch KT1-3 of the first time relay is turned off, and a coil KT2-1 of the second time relay is turned off; the coil KA2-1 of the second intermediate relay is powered off, the first normally open switch KA2-2 of the second intermediate relay is disconnected, the second normally open switch KA2-3 of the second intermediate relay is disconnected, the auxiliary electromagnetic valve is powered off, and the second igniter is powered off.
if the ignition is unsuccessful, the delay time of the second time relay is up, the delay disconnection switch KT2-2 of the second time relay is disconnected, the coil KA2-1 of the second intermediate relay is powered off, the auxiliary electromagnetic valve is powered off, and the second igniter is powered off to prevent repeated ignition.
the automatic control circuit is also provided with an audible and visual alarm which is connected with a power supply through a third normally open switch KA1-4 of the first intermediate relay.
when the combustion furnace is flameout, when the coil KA1-1 of the first intermediate relay is electrified, the third normally open switch KA1-4 of the first intermediate relay is closed, and the audible and visual alarm sends out audible and visual alarm signals.
The flame monitor adopts a BWZJ-13 ultraviolet flame monitor, and the first igniter and the second igniter adopt an XLND-03 high-energy igniter.
The flame monitor, the first igniter and the second igniter are all mature and existing products, the quality is reliable, and the replacement is convenient.
the utility model has the obvious effects that the utility model provides a natural gas combustion furnace flameout protection and automatic ignition device of a compound fertilizer plant, which can automatically ignite through the flameout protection and ignition device and also conveniently control the flameout purging time of the combustion furnace.
drawings
FIG. 1 is a block diagram of the present invention;
fig. 2 is a circuit structure diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
as shown in fig. 1-2, a flameout protection and automatic ignition device for a natural gas combustion furnace of a compound fertilizer plant comprises a combustion furnace 1 and a natural gas pipe 2, wherein a burner 15 is arranged in the middle of the side wall of the combustion furnace 1 in a penetrating manner, an outlet 153 of the burner 15 extends into the combustion furnace 1, the natural gas pipe 2 is connected with an air inlet pipe 151 of the burner 15 through a manual ignition gas pipe 21, the manual ignition gas pipe 21 is provided with an auxiliary manual valve 22, and the flameout protection and automatic ignition device further comprises a first igniter 16, and an ignition head 161 of the first igniter 16 is close to the outlet 153 of the; the air inlet 152 of the combustor 15 is also connected with a blower 3, and the blower 3 is provided with a manual blower switch HF;
The combustor 15 is a double-layer sleeve, a channel in the middle is used for introducing natural gas, and a channel in the interlayer is used for ventilating and sweeping the natural gas in the hearth. An outlet 153 of the burner 15 is arranged on the combustion furnace 1, and the outlet 153 is provided with an air outlet and an air outlet; an air inlet pipe 151 and an air inlet 152 are arranged at the outer end of the combustor 15, the air inlet pipe 151 is communicated with a middle channel, and the air inlet 152 is communicated with the interlayer channel;
The ignition head 161 of the first igniter 16 is fixed to the combustion furnace 1 and is adjacent to the outlet 153 of the burner 15, the first igniter 16 being used for manual ignition; the first igniter 16 is manually energized by a button;
the natural gas pipe 2 is connected with an air inlet pipe 151 of the combustor 15 through a main electromagnetic valve 4 after passing through a main manual valve 23; the natural gas pipe 2 is also connected with an air inlet pipe 151 of the combustor 15 through an electric ignition air pipe 24 after passing through the main manual valve 23, and the electric ignition air pipe 24 is provided with an auxiliary electromagnetic valve 5;
The blower 3, the main electromagnetic valve 4 and the auxiliary electromagnetic valve 5 are connected with a flameout protection and ignition device 6, the flameout protection and ignition device 6 comprises a flame monitor 61, and a probe 611 of the flame monitor 61 extends into the combustion furnace 1; the flame monitor 61 is connected with an automatic control circuit 62; the automatic control circuit 62 is connected to a second igniter 63,
The ignition needle 631 of the second igniter 63 is adjacent to the outlet 153 of the burner 15; the automatic control circuit 62 is also connected to the blower 3.
the probe 611 of the flame monitor 61 is fixed on the combustion furnace 1;
An ignition needle 631 of the second igniter 63 is fixed to the combustion furnace 1 near the outlet 153 of the burner 15 for auto-ignition;
the second igniter 63 has the same structure as the first igniter 16, and the ignition needle 631 has the same structure as the ignition head 161;
the top of the side wall of the combustion furnace 1 is provided with a hot gas outlet 11, the hot gas outlet 11 is connected with an induced draft fan 12, the induced draft fan 12 is used for absorbing hot gas in the combustion furnace 1, the top of the combustion furnace 1 is also provided with an explosion-proof sheet 13, the bottom of the side wall of the combustion furnace 1 is also provided with an air inlet 14, and an ignition head 161 of a first igniter 16 is fixedly connected with the combustion furnace 1.
wherein the flame monitor 61 is used for detecting whether a flame signal is present at the outlet 153 of the burner 15; through the circuit structure arrangement, after the flame monitor 61 acquires a flameout signal of the burner 15, the flame monitor sends a signal to the automatic control circuit 62, the automatic control circuit 62 controls the main electromagnetic valve 4 to be closed, the natural gas supply of the combustion furnace 1 is cut off, and the automatic control circuit 62 controls the blower 3 to purge the natural gas in the combustion furnace 1; after the time delay is set, the blower 3 is controlled to be closed, then the auxiliary electromagnetic valve 5 is controlled to be opened, natural gas is provided for the combustor 15 through the electric ignition air pipe 24, the second igniter 63 is controlled to be electrified and to be ignited again, the main electromagnetic valve 4 is controlled to be opened after the ignition is successful, and then the auxiliary electromagnetic valve 5 is closed. The control circuit can realize the automatic ignition of the combustion furnace 1 and conveniently control the flameout purging time of the combustion furnace 1.
under automatic control, the main manual valve 23 is in an open state, and the auxiliary manual valve 22 is in a closed state;
In a special situation, for example, when the automatic control circuit 62 is damaged, the automatic control circuit 62 may be powered off by manually igniting, and the main solenoid valve 4 is in an open state when powered off, and the sub-solenoid valve 5 is in a closed state when powered off; during manual ignition, the main manual valve 23 is closed, the manual fan switch HF is closed, the hearth of the combustion furnace 1 is swept through the blower 3, after natural gas in the hearth is swept out, the manual fan switch HF is disconnected, the blower 3 is turned off, the auxiliary manual valve 22 is opened, natural gas is supplied to the combustor 15 through the manual ignition gas pipe 21, the power supply of the first igniter 16 is manually closed, the combustor 15 is ignited, the main manual valve 23 is opened, and the auxiliary manual valve 22 is closed.
The amount of air supplied through the sub manual valve 22 and the sub electromagnetic valve 5 is smaller than the amount of air supplied directly through the main manual valve 23 and the main electromagnetic valve 4, and the valve is used for ignition and is not easy to cause explosion accidents.
the automatic control circuit 62 controls the second igniter 63 and the auxiliary electromagnetic valve 5 to be powered on and powered off through the time delay breaking circuit 621.
through the circuit structure arrangement, when the set time of the delay breaking circuit 621 does not reach, the delay breaking circuit 621 controls the second igniter 63 and the auxiliary electromagnetic valve 5 to be electrified; on the contrary, when the set time of the delay breaking circuit 621 is reached, the delay breaking circuit 621 controls the second igniter 63 and the auxiliary electromagnetic valve 5 to be powered off.
Through the circuit arrangement, when the automatic control circuit 62 and the delay breaking circuit 621 control the second igniter 63 to not ignite successfully at one time, the second igniter 63 and the auxiliary electromagnetic valve 5 are controlled to be powered off. The second igniter 63 is prevented from igniting for multiple times, so that the detonation accident caused by the fact that the ignition is successful suddenly after the ignition is unsuccessful for multiple times is avoided.
In addition, the reasons of unsuccessful ignition are more, so that managers can conveniently find the reasons.
The automatic control circuit 62 is provided with a manual switch QF, the manual switch QF controls the automatic control circuit 62 to be powered on and powered off, the automatic control circuit 62 is provided with a first intermediate relay, a coil KA1-1 of the first intermediate relay is connected with a power supply through the manual switch QF after passing through a normally closed switch of the flame monitor 61, and a main electromagnetic valve 4 is connected with the power supply through the manual switch QF after passing through a first normally open switch KA1-2 of the first intermediate relay;
The automatic control circuit 62 is also provided with a first time relay, and a coil KT1-1 of the first time relay is connected with a power supply through a manual switch QF after passing through a second normally open switch KA1-3 of a first intermediate relay;
The blower 3 is provided with a contactor, and a normally open switch KM1-2 of the contactor controls the blower 3 to be powered on and powered off;
the first end of an instantaneous closing delay switch KT1-2 of the first time relay is connected with one end of a power supply through a coil KM1-1 of a contactor, the first end of an instantaneous closing delay switch KT1-2 is also connected with the first end of a manual fan switch HF, the second end of the instantaneous closing delay switch KT1-2 and the second end of the manual fan switch HF are connected with the second end of the power supply through an alternative change-over switch K, and a normally open switch KM1-2 of the contactor controls the on-off of the blower 3;
the time-delay breaking circuit 621 comprises a second time relay and a second intermediate relay, a coil KT2-1 of the second time relay is connected with a power supply through a manual switch QF after passing through a time-delay closed switch KT1-3 of the first time relay, a coil KA2-1 of the second intermediate relay is connected with the power supply through the manual switch QF after passing through a time-delay disconnected switch KT2-2 of the second time relay, an auxiliary electromagnetic valve 5 is connected with the power supply through the manual switch QF after passing through a first normally-open switch KA2-2 of the second intermediate relay, and a second igniter 63 is connected with the power supply through the manual switch QF after passing through a second normally-open switch KA2-3 of the second intermediate relay.
Through the circuit structure, when ignition control is needed manually, the manual switch QF is disconnected, the second end of the manual fan switch HF is connected with the alternative change-over switch K, the manual switch QF controls the automatic control circuit 62 to be powered off, and the automatic control circuit 62 does not ignite. A coil KM1-1 of the contactor is manually controlled to be powered on and powered off by a manual fan switch HF, and a normally open switch KM1-2 of the contactor controls the blower 3 to be powered on and powered off.
when the automatic ignition control is needed, the manual switch QF is closed, the second end of the instantaneous closing delay disconnection switch KT1-2 is connected with the alternative change-over switch K, the manual switch QF controls the automatic control circuit 62 to be electrified, and the automatic control circuit 62 controls the automatic ignition. An instantaneous closing time-delay switch KT1-2 automatically controls a coil KM1-1 of a contactor to be powered on and powered off, and a normally open switch KM1-2 of the contactor controls a blower 3 to be powered on and powered off.
the working principle of automatic control is as follows:
when a probe 611 of the flame monitor 61 detects a flameout signal in the combustion furnace 1, a normally closed switch of the flame monitor 61 is closed, a coil KA1-1 of the first intermediate relay is electrified, a first normally open switch KA1-2 of the first intermediate relay is closed to control the main electromagnetic valve 4 to be electrified, the main electromagnetic valve 4 is switched from an open state to a closed state, and natural gas is cut off;
A second normally open switch KA1-3 of the first intermediate relay is closed, and a coil KT1-1 of the first time relay is electrified;
An instantaneous closing delay disconnection switch KT1-2 of the first time relay is closed, a coil KM1-1 of the contactor is electrified, and a normally open switch KM1-2 of the contactor controls the hair drier 3 to be electrified;
After the set purging time is delayed, an instantaneous closing delay-off switch KT1-2 of the first time relay is switched off, a coil KM1-1 of the contactor is switched off, and a normally open switch KM1-2 of the contactor is switched off to control the blower 3 to be switched off;
The delay breaking circuit 621 includes a second time relay and a second intermediate relay,
a time delay closing switch KT1-3 of the first time relay is closed in a time delay setting time, and a coil KT2-1 of the second time relay is controlled to be electrified;
a delay disconnecting switch KT2-2 of the second time relay is closed, a coil KA2-1 of the second intermediate relay is electrified, a first normally open switch KA2-2 of the second intermediate relay is closed, and the auxiliary electromagnetic valve 5 is controlled to be electrified; a second normally open switch KA2-3 of the second intermediate relay is closed, and the second igniter 63 is electrified and ignited;
if the ignition is successful, the probe 611 of the flame monitor 61 detects a flame signal in the combustion furnace 1, the normally closed switch of the flame monitor 61 is switched off, the coil KA1-1 of the first intermediate relay is powered off, the first normally open switch KA1-2 of the first intermediate relay is switched off to control the main electromagnetic valve 4 to be powered off, and natural gas is supplied to the combustion furnace 1;
a second normally open switch KA1-3 of the first intermediate relay is switched off, and a coil KT1-1 of the first time relay is switched off; a time delay closing switch KT1-3 of the first time relay is turned off, and a coil KT2-1 of the second time relay is turned off; the time delay disconnection switch KT2-2 of the second time relay is disconnected, the coil KA2-1 of the second intermediate relay is powered off, the first normally-open switch KA2-2 of the second intermediate relay is disconnected, the second normally-open switch KA2-3 of the second intermediate relay is disconnected, the auxiliary electromagnetic valve 5 is powered off, and the second igniter 63 is powered off.
If the ignition is unsuccessful, the delay time of the second time relay is up, the delay disconnection switch KT2-2 of the second time relay is disconnected, the coil KA2-1 of the second intermediate relay is powered off, the auxiliary electromagnetic valve 5 is powered off, and the second igniter 63 is powered off, so that repeated ignition is prevented.
The automatic control circuit 62 is also provided with an audible and visual alarm 7, and the audible and visual alarm 7 is connected with a power supply through a third normally open switch KA1-4 of the first intermediate relay.
when the combustion furnace 1 is flamed out, the coil KA1-1 of the first intermediate relay is electrified, the third normally open switch KA1-4 of the first intermediate relay is closed, and the audible and visual alarm 7 sends out audible and visual alarm signals.
The flame monitor 61 adopts a BWZJ-13 ultraviolet flame monitor, and the first igniter 16 and the second igniter 63 adopt an XLND-03 high-energy igniter.
the flame monitor 61, the first igniter 16 and the second igniter 63 are all mature and existing products, so that the quality is reliable and the replacement is convenient.
The first time relay and the second time relay can adopt commercially mature electronic time relays, such as HHS3 series electronic time relays.
Besides the automatic control circuit 62 and the delay breaking circuit 621 which adopt the time relay and the intermediate relay, the automatic control circuit 62 and the delay breaking circuit 621 can also adopt a control circuit formed by a PLC logic controller.
The outer wall of the combustion furnace 1 is also provided with a high-temperature resistant asbestos pad which can prevent heat loss and personnel scalding, saves energy and is not shown.
Finally, it is noted that: the above list is only the concrete implementation example of the present invention, and of course those skilled in the art can make modifications and variations to the present invention, and if these modifications and variations fall within the scope of the claims of the present invention and their equivalent technology, they should be considered as the protection scope of the present invention.
Claims (5)
1. a flameout protection and automatic ignition device of a natural gas combustion furnace of a compound fertilizer plant comprises a combustion furnace (1) and a natural gas pipe (2), wherein a burner (15) penetrates through the middle part of the side wall of the combustion furnace (1), an outlet (153) of the burner (15) extends into the combustion furnace (1), the natural gas pipe (2) is connected with an air inlet pipe (151) of the burner (15) through a manual ignition gas pipe (21), the manual ignition gas pipe (21) is provided with an auxiliary manual valve (22), the natural gas combustion furnace further comprises a first igniter (16), and an ignition head (161) of the first igniter (16) is close to the outlet (153) of the burner (15); the air inlet (152) of the combustor (15) is also connected with a blower (3), and the blower (3) is provided with a manual blower switch HF;
The natural gas pipeline (2) is connected with an air inlet pipe (151) of a combustor (15) through a main electromagnetic valve (4) after passing through a main manual valve (23); the natural gas pipe (2) is connected with an air inlet pipe (151) of the combustor (15) through an electric ignition air pipe (24) after passing through the main manual valve (23), and the electric ignition air pipe (24) is provided with an auxiliary electromagnetic valve (5);
The blower (3), the main electromagnetic valve (4) and the auxiliary electromagnetic valve (5) are connected with a flameout protection and ignition device (6), the flameout protection and ignition device (6) comprises a flame monitor (61), and a probe (611) of the flame monitor (61) extends into the combustion furnace (1); the flame monitor (61) is connected with an automatic control circuit (62); the automatic control circuit (62) is connected with a second igniter (63), and an ignition needle (631) of the second igniter (63) is close to an outlet (153) of the burner (15); the automatic control circuit (62) is also connected with the blower (3).
2. The flameout protection and automatic ignition device for natural gas combustion furnace of compound fertilizer plant according to claim 1, characterized in that: the automatic control circuit (62) controls the on-off of the second igniter (63) and the auxiliary electromagnetic valve (5) through the time delay breaking circuit (621).
3. the flameout protection and automatic ignition device for natural gas combustion furnace of compound fertilizer plant according to claim 2, characterized in that: the automatic control circuit (62) is provided with a manual switch QF, the manual switch QF controls the power on and off of the automatic control circuit (62), the automatic control circuit (62) is provided with a first intermediate relay, a coil of the first intermediate relay is connected with a power supply through a normally closed switch of the flame monitor (61), and a main electromagnetic valve (4) is connected with the power supply through a first normally open switch of the first intermediate relay;
The automatic control circuit (62) is also provided with a first time relay, and a coil of the first time relay is connected with a power supply through a second normally open switch of the first intermediate relay;
the first end of an instantaneous closing delay switch of the first time relay is connected with one end of a power supply through a coil of a contactor, the first end of the instantaneous closing delay switch is also connected with the first end of a manual fan switch HF, the second end of the instantaneous closing delay switch and the second end of the manual fan switch HF are connected with the second end of the power supply through an alternative change-over switch K, and a normally open switch of the contactor controls the on-off of a blower (3);
the time-delay breaking circuit (621) comprises a second time relay and a second intermediate relay, a coil of the second time relay is connected with a power supply through a time-delay closed switch of the first time relay, a coil of the second intermediate relay is connected with the power supply through a time-delay disconnected switch of the second time relay, the auxiliary electromagnetic valve (5) is connected with the power supply through a first normally-open switch of the second intermediate relay, and the second igniter (63) is connected with the power supply through a second normally-open switch of the second intermediate relay.
4. The flameout protection and automatic ignition device for natural gas combustion furnace of compound fertilizer plant according to claim 3, characterized in that: the automatic control circuit (62) is further provided with an audible and visual alarm (7), and the audible and visual alarm (7) is connected with a power supply through a third normally open switch of the first intermediate relay.
5. The flameout protection and automatic ignition device for natural gas combustion furnace of compound fertilizer plant according to claim 1, characterized in that: the flame monitor (61) adopts a BWZJ-13 ultraviolet flame monitor, and the first igniter (16) and the second igniter (63) adopt an XLND-03 high-energy igniter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920485320.9U CN209782995U (en) | 2019-04-11 | 2019-04-11 | Flameout protection and automatic ignition device for natural gas combustion furnace of compound fertilizer plant |
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| CN201920485320.9U CN209782995U (en) | 2019-04-11 | 2019-04-11 | Flameout protection and automatic ignition device for natural gas combustion furnace of compound fertilizer plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111911973A (en) * | 2020-07-10 | 2020-11-10 | 上海纯米电子科技有限公司 | Anti-extinguishing gas stove |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111911973A (en) * | 2020-07-10 | 2020-11-10 | 上海纯米电子科技有限公司 | Anti-extinguishing gas stove |
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