CN217178518U - Combustor containing low-oxygen gas - Google Patents
Combustor containing low-oxygen gas Download PDFInfo
- Publication number
- CN217178518U CN217178518U CN202220193640.9U CN202220193640U CN217178518U CN 217178518 U CN217178518 U CN 217178518U CN 202220193640 U CN202220193640 U CN 202220193640U CN 217178518 U CN217178518 U CN 217178518U
- Authority
- CN
- China
- Prior art keywords
- gas
- low
- oxygen gas
- burner
- kiln
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
Abstract
The utility model provides a combustor that contains low oxygen gas that burning flame temperature is lower and can control, the flue gas contains NOx lower, energy-conservation. The burner includes channels, at least one of which has an inlet end connected to a source of hypoxic gas. Or the combustor also comprises a separate low-oxygen gas nozzle, and the inlet of the low-oxygen gas nozzle is connected with the low-oxygen gas source. In this case, the burner with the fuel channel and the independent low-oxygen gas nozzle form a burner group.
Description
Technical Field
The invention relates to a combustion method of an industrial kiln and a combustor thereof.
Background
The burner is widely applied to industrial kilns, is a device for providing fuel for the kilns to burn and generate a high-temperature gas heat source, and is also called as a burner. The burner outlet is generally tubular and has a fuel passage and a combustion air passage coaxially disposed therein. For combustion purposes, some burners have a coaxial multi-layer sleeve type channel, for example, a burner of a rotary cement kiln has 4 channels with 4 radial rings: the central air channel, the rotational flow air channel, the pulverized coal and pulverized coal feeding air channel, the axial flow air channel and even more layers of channels, and the pressure, flow and air speed of each channel can be adjusted and controlled. The burner is very suitable for a rotary cement kiln, can provide high-temperature flame for the rotary cement kiln, and is beneficial to calcining cement clinker. But high temperature flames must produce higher NOx.
However, there are many occasions that the material is calcined without too high temperature, and the flame temperature of the ignition point is not too high, but the requirement of low-temperature flame is difficult to realize by the existing burner unless the calorific value of the fuel is too low, such as blast furnace gas, low-grade coal and the like, or a large amount of cold air is mixed, but the method is not energy-saving. For the rotary kiln for lime burning, the burning temperature can meet the burning requirement at 1100-1200 ℃; for the pellet rotary kiln, the calcining temperature is about 1100 ℃; the fuel used is coal gas, coal powder, natural gas and the like, the adopted burners are mostly 4-channel burners, but the temperature of flame at a fire point is usually about 1500 ℃, even is close to 1600 ℃, and then a larger amount of NOx is generated unnecessarily.
In addition, if pulverized coal is used as fuel, the flame temperature of the fire point is about 1500 ℃, so that ring formation is easily generated, for example, lime rotary kilns and pellet rotary kilns, the flame temperature cannot be controlled at a lower temperature, ash content of coal is easily burnt into a liquid phase, powdery materials in the rotary kilns, particularly materials at eutectic points, are also easily subjected to liquid phase formation to form ring formation, normal production is seriously influenced, and the pulverized coal is not treated by a particularly effective method, and finally only can be stopped and manually moved into the rotary kilns to be excavated and removed.
In shaft kiln calcination, such as concurrent lime shaft kiln using natural gas as fuel, the flame temperature is very high, burning out the burner and refractory material is easy, lime is also easy to over-burn, and it is necessary to try to reduce the combustion flame temperature.
For most kilns for drying purposes, such as light calcium carbonate or nano calcium carbonate heat sources dried by smoke insulation, the temperature is generally only required to be 200-900 ℃, but the flame temperature of a combustion chamber is also very high, particularly the flame temperature is higher by using natural gas as fuel, and the temperature is generally reduced by using excessive air, so that the heat loss is large. There are occasions where the kiln flame requires a reducing atmosphere.
Therefore, it is necessary to design a burner having a relatively low combustion flame temperature.
Disclosure of Invention
The purpose of this patent is to provide a combustor that contains low oxygen gas that combustion flame temperature is lower and can be controlled, the flue gas contains NOx less, energy-conservation.
In order to achieve the above object, the burner of the patent comprises channels, at least one of which has an inlet end connected to a source of low-oxygen gas.
The combustor containing the low-oxygen gas at least comprises a fuel and low-oxygen gas mixing channel, and the inlet ends of the fuel and low-oxygen gas mixing channel are respectively connected with a fuel source and a low-oxygen gas source.
The burner containing the low-oxygen gas at least comprises a low-oxygen gas channel; the inlet of the hypoxic gas channel is connected with the hypoxic gas source. Of course, the burner also contains a fuel channel and a combustion air channel; the inlet end of the fuel channel is connected with the fuel source, and the inlet end of the combustion air channel is connected with the combustion air source.
The combustor at least comprises a combustion air and hypoxia gas mixing channel, and the inlet ends of the combustion air and hypoxia gas mixing channel are respectively connected with a combustion air source and a hypoxia gas source.
This patent still provides another kind simultaneously and burns that flame temperature is lower and can control, the flue gas contains NOx lower, energy-conserving combustor that contains the hypoxemia gas.
The combustor containing the low-oxygen gas also comprises an independent low-oxygen gas nozzle, and the inlet end of the low-oxygen gas nozzle is connected with a low-oxygen gas source. At the moment, the burner with the fuel channel and the independent low-oxygen gas spray pipe form a burner group, and the spray port of the burner and the spray port of the independent low-oxygen gas spray pipe are positioned in the kiln.
The burner which is used together with the low-oxygen gas nozzle to form the burner group can be a common burner or a burner containing low-oxygen gas (a burner with at least one channel connected with a low-oxygen gas source at the inlet end).
In the burner containing the hypoxic gas, the hypoxic gas is tail gas generated by a kiln or mixed gas of air and the tail gas. Of course, the low-oxygen gas may be nitrogen, but the cost is relatively high.
The burner containing the hypoxic gas is provided with a meter for detecting flow or/and pressure or/and temperature and a regulating valve on a pipeline connected with the hypoxic gas source. For example, a meter and a regulating valve for detecting the flow or/and the pressure or/and the temperature are arranged on a pipeline connecting the inlet end of the mixing channel of the fuel and the hypoxic gas with the hypoxic gas source; the pipeline connecting the inlet end of the hypoxic gas channel and the hypoxic gas source is provided with an instrument and a regulating valve for detecting flow or/and pressure or/and temperature; the pipeline connecting the inlet end of the hypoxia gas nozzle and the hypoxia gas source is provided with a meter and a regulating valve for detecting flow or/and pressure or/and temperature.
In the combustor containing the low-oxygen gas, the inlet end of at least one channel in each channel contained in the combustor is connected with a tail gas source discharged by a rotary kiln or a vertical kiln or a dryer.
The burner containing the low-oxygen gas is characterized in that the pulverized coal/natural gas fuel channel of the burner is also connected with a tail gas source discharged by a rotary kiln or a vertical kiln or a dryer.
The combustor containing the low-oxygen gas is characterized in that the independent low-oxygen gas spray pipe is connected with a tail gas source discharged by the rotary kiln or the vertical kiln or the dryer, the independent low-oxygen gas spray pipe is the independent tail gas spray pipe at the moment, an outlet of the independent tail gas spray pipe is located in a combustion hearth of the rotary kiln or the vertical kiln or the dryer, and tail gas can reach a high-temperature region of a combustion area of the kiln.
The beneficial effect of this patent:
1. due to the low oxygen content in the burner channel, e.g. the tail gas, O, of the rotary kiln 2 The content is usually less than 16%, even almost no O 2 The low-oxygen gas is used as a carrier medium during combustion, absorbs heat, disperses ignition points and reduces the temperature of combustion flame, thereby realizing the requirement of low-temperature flame.
2. The low-oxygen gas absorbs heat, is mixed with the combustion products of the fuel to reach the same temperature, participates in heat exchange of the calcined material together, transfers the heat to the material, is pumped out from the tail gas system after being discharged and is sent into the combustor system, and the circulation is repeated, so that the purpose of controlling the combustion temperature is achieved, and energy consumption is not caused.
3. The temperature of the combustion flame can be controlled by adjusting the amount of hypoxic gas that is cyclically injected into the burner.
4. The possibility of NOx generation is greatly avoided or mitigated since the temperature of the combustion flame can be controlled to the desired relatively low range.
5. For the rotary kiln, because the temperature of the combustion flame can be controlled in a required relatively low range, particularly for the coal-fired lime rotary kiln and the pellet rotary kiln, the possibility of ring formation in the kiln is avoided or greatly reduced, thereby greatly improving the equipment operation rate, realizing normal production, and bringing a series of good conditions for improving the yield, reducing the consumption, stabilizing the quality, reducing the operating cost and the like.
6. For the smoke isolating type dryer system, the exhaust gas discharged by combustion products is led into the combustion furnace for circulation, so that the temperature of the exhaust gas is reduced to a required temperature range, the traditional method of surplus cold air is replaced, the waste heat of the exhaust gas is utilized, and the energy is saved.
In the patent, the jet port of the burner at least comprises a fuel and low-oxygen gas mixing channel, or/and the jet port of the burner at least comprises a fuel channel and a low-oxygen gas channel respectively, or/and the burner of the patent comprises an independent low-oxygen gas nozzle.
The low-oxygen gas of the burner is tail gas generated by the kiln or mixed gas of air and the tail gas generated by the kiln.
In practical application, the burner with low oxygen gas can be modified from the original burner with non-low oxygen gas.
Drawings
Fig. 1 is a schematic diagram of an embodiment 1 in which a burner bank is used on a rotary kiln.
Fig. 2 is an enlarged view of the cooler, rotary kiln, burner bank, etc. of fig. 1.
Fig. 3 is a schematic cross-sectional view of the burner bank of fig. 2.
FIG. 4 is a schematic view of example 2 in which a burner containing a low oxygen gas is used in a rotary kiln.
FIG. 5 is a cross-sectional schematic view of the main burner of FIG. 4.
FIG. 6 is a schematic view of example 3 in which a burner containing a low oxygen gas is used in a rotary kiln.
Fig. 7 is a schematic view of embodiment 4 in which a burner bank is used in a rotary dryer.
FIG. 8 is a schematic view of example 5 in which the burner is used in a shaft kiln.
FIG. 9 is a schematic view of example 6 in which the burner is used in a shaft kiln.
In the figure, a preheater 1, a high-temperature material feeding device 2, a smoke chamber 3, a rotary kiln 4, a cooler 5, a blast device 6, a dust remover 7, a draught fan 8, a chimney 9, a fuel source 10, a storage bin 11, a combustion chamber 17, a rotary dryer 18, a discharge end cover 19, a smoke exhaust system and a smoke exhaust system are arranged in the kiln,
A burner 40, a circumferential burner 60, a central burner 70, a beam burner 80,
A low oxygen gas lance 50.
Detailed Description
Example 1:
referring to fig. 1 and 2, the vertical preheater-rotary kiln-vertical cooler block granular material calcining system mainly comprises a preheater 1, a high-temperature material feeding device 2, a smoke chamber 3, a rotary kiln 4, a cooler 5, a blowing device 6, a dust remover 7, an induced draft fan 8, a chimney 9, a fuel source 10 and a storage bin 11.
The material enters a preheater from a bin 11, and the heated material is discharged from the bottom of the preheater and enters a rotary kiln for calcination through a high-temperature material feeding device; and the material discharged from the discharge end of the rotary kiln enters the cavity of the cooler, is subjected to heat exchange cooling with cooling air entering the cavity of the cooler, and is discharged from the bottom of the cooler. Air from the air blowing device 6 enters the cavity of the cooler, exchanges heat with materials in the cavity of the cooler and then enters the kiln head cover and the rotary kiln to form combustion-supporting air. The flue gas discharged from the rotary kiln enters the cavity of the preheater through the smoke chamber and the high-temperature flue gas pipeline to exchange heat with the materials in the cavity of the preheater, enters the dust removal or desulfurization device of the dust remover from the top of the preheater and is then introduced into a chimney through an induced draft fan to be discharged.
After a part of kiln tail flue gas discharged from the upper part of the cylinder body of the preheater and a part of kiln tail flue gas dedusted by the deduster are pressurized by the fan, one path of the flue gas is sent to the independent low-oxygen gas spray pipe 50, and the other path of the flue gas is sent to the low-oxygen gas channel 33 of the main combustor 30. The main burner 30 also has an ignition channel 37, a fuel channel 31 communicating with a fuel source, a combustion air channel 32 communicating with the blowing device 6, and the like. An instrument for detecting flow or/and pressure or/and temperature and a regulating valve 100 are arranged on the tail gas pipeline connected with the inlet end of the low-oxygen gas channel 33; and a meter and a regulating valve 100 for detecting flow or/and pressure or/and temperature are arranged on the tail gas pipeline connected with the inlet end of the low-oxygen gas nozzle 50.
The low oxygen containing burner array consisting of the primary burner 30 and the low oxygen gas lance 50 extends through the kiln head cover to the rotary kiln discharge end and is coated with refractory 38. The structural schematic diagram of the burner is shown in fig. 2 and 3.
In the embodiment 1, when the burner having the low-oxygen gas channel is used in a rotary kiln, the inlet of the low-oxygen gas channel of the burner is connected with a kiln tail flue gas discharge pipeline, or a low-oxygen gas nozzle is arranged independently of the burner,forming a burner group consisting of a main burner and a low-oxygen gas nozzle; a booster fan can be arranged in the middle of the delivery of the low-oxygen gas. The main component of kiln tail flue gas is N 2 And CO 2 ，O 2 The content is generally 2 to 16%. The low-oxygen gas has the function of absorbing heat to the flame formed by the burner and reducing the temperature of the flame, and the gas temperature required by combustion can be controlled by controlling the flow of the low-oxygen gas, namely the low-oxygen gas is doped into the kiln tail flue gas, so that the generation of liquid phase at the ash melting point of pulverized coal and the low-melting point material in the kiln to form a ring formation is avoided, and the generation of NOx is greatly reduced. At the same time, however, the low-oxygen gas absorbs heat and transfers the heat to the material after the temperature of the low-oxygen gas rises. Because the low-oxygen gas is tail gas discharged from the kiln tail, has a certain temperature and forms closed cycle gas, the participation of the kiln tail flue gas basically does not consume extra heat.
Example 2:
referring to fig. 4 (and fig. 1), after a part of the kiln tail flue gas is pressurized by the fan, one path of the flue gas is mixed with the fuel and enters the fuel and kiln tail flue gas mixing channel 34 of the burner 40, and the other path of the flue gas is mixed with the combustion air and enters the 3 combustion air and low-oxygen gas mixing channels 35 of the burner 40. An instrument for detecting flow or/and pressure or/and temperature and an adjusting valve 100 are arranged on a tail gas pipeline connected with the inlet end of the fuel and kiln tail gas mixing channel 34; and a tail gas pipeline connected with an inlet of the air blowing device 6 is provided with a meter for detecting flow or/and pressure or/and temperature and a regulating valve 100.
The burner 40 is a burner containing low oxygen gas and extends through the kiln hood to the discharge end of the rotary kiln. A schematic cross-sectional view of the burner is shown in fig. 5.
In the embodiment 2, when the burner with the low-oxygen gas channel is used in a rotary kiln, an inlet of a combustion fan of the burner is connected with a kiln tail flue gas source channel to form a burner combustion air channel as the low-oxygen gas channel, or a fuel source pipeline of the burner is communicated with a kiln tail flue gas source, namely, kiln tail flue gas is contained in a fuel jet channel of the burner to form low-oxygen gas delivery; a booster fan can be arranged in the middle of conveying kiln tail gas or low-oxygen gas, and the tube pass can be set with temperatureAnd a detection instrument for measuring the temperature, the pressure and the flow and a regulating valve 100. The main component of kiln tail flue gas is N 2 And CO 2 ，O 2 The content is about 2-16%. The low-oxygen gas has the function of absorbing heat to reduce the temperature of the flame formed by the burner, and the gas temperature required by combustion can be controlled by controlling the flow of the doped kiln tail gas, so that the formation of rings caused by the liquid phase generated by the melting point of ash of pulverized coal and the low-melting-point material in the kiln is avoided, and the generation of NOx is greatly reduced. At the same time, however, the low-oxygen gas absorbs heat and transfers the heat to the material after the temperature of the low-oxygen gas rises. Because the low-oxygen gas is tail gas discharged from the kiln tail, has a certain temperature and forms closed cycle gas, the participation of the kiln tail flue gas basically does not consume extra heat.
Example 3:
referring to fig. 6 (and fig. 1), after a part of the kiln tail flue gas is pressurized by the blower, one path of the flue gas is sent into the low-oxygen gas channel 33 of the burner 40, and the other two paths of the flue gas are mixed with combustion air and then enter 2 combustion air and low-oxygen gas mixing channels 35 of the burner 40. An instrument for detecting flow or/and pressure or/and temperature and a regulating valve 100 are arranged on the tail gas pipeline connected with the inlet end of the low-oxygen gas channel 33; and a tail gas pipeline connected with the inlet ends of the combustion air and hypoxic gas mixing channel 35 is provided with an instrument for detecting flow or/and pressure or/and temperature and a regulating valve 100.
The burner 40 is a burner containing low oxygen gas and extends through the kiln hood to the discharge end of the rotary kiln.
In the embodiment 3, in the case where the burner including the low-oxygen gas channel is used in the rotary kiln, at least one channel in the pipeline system of the burner is communicated with the kiln tail flue gas source to form the low-oxygen gas channel, and a booster fan may be set in the middle of the low-oxygen gas delivery. The low-oxygen gas has the effect of absorbing heat to reduce the temperature of the flame formed by the burner, and the required gas temperature for combustion can be controlled by controlling the flow of the mixed kiln tail gas, so that the formation of a ring and the generation of NOx are greatly reduced by avoiding the generation of a liquid phase at the ash melting point of pulverized coal and a low-melting-point material in a kiln. At the same time, however, the low-oxygen gas absorbs heat and transfers the heat to the material after the temperature of the low-oxygen gas rises. Because the low-oxygen gas is tail gas discharged from the kiln tail, has a certain temperature and forms closed cycle gas, the participation of the kiln tail flue gas basically does not consume extra heat.
Example 4:
referring to fig. 7, the material drying system mainly includes a combustion chamber 17, a rotary dryer 18, a discharge end housing 19, a blower 6, a dust remover 7, an induced draft fan 8, a chimney 9, a fuel source 10, and a storage bin 11.
The material enters a rotary dryer from a bin 11 through a feeding pipe for drying; and discharging from the discharge end of the rotary dryer. The flue gas discharged by the rotary dryer enters a dust remover for dust removal or a desulfurization device from the top of the discharge end housing and is introduced into a chimney through an induced draft fan for discharge.
Part of the dryer tail gas discharged from the upper part of the discharge end housing cylinder or part of the dryer tail gas dedusted by the deduster is sent into the independent low-oxygen gas nozzle 50 or/and the low-oxygen gas channel 33 of the main burner 30. The main burner 30 also has a fuel channel 31 communicating with a fuel source, a combustion air channel 32 communicating with the blower 6, and the like. An instrument for detecting flow or/and pressure or/and temperature and a regulating valve 100 are arranged on the tail gas pipeline connected with the inlet end of the low-oxygen gas channel 33; and a meter and a regulating valve 100 for detecting flow or/and pressure or/and temperature are arranged on the tail gas pipeline connected with the inlet end of the low-oxygen gas nozzle 50.
The low oxygen gas containing burner, which consists of the main burner 30 and the low oxygen gas lance 50, extends into the combustion chamber.
In the embodiment 4, the burner having the low oxygen gas channel is used in the rotary dryer, particularly in the smoke-isolation type rotary dryer, the inlet of the low oxygen gas channel of the burner is connected to the flue gas discharge pipeline, the outlet of the burner is located in the combustion chamber, a booster fan can be set in the tail gas pipeline, or the tail gas channel can be independently set to directly introduce the exhaust port into the hot blast stove. The low-oxygen gas has the function of absorbing heat to the flame formed by the burner and reducing the temperature of the flame, and the gas temperature required by combustion can be controlled by controlling the flow of the low-oxygen gas, so that the generation of NOx is greatly reduced. After the low-oxygen gas absorbs heat and the temperature rises, the heat is directly or indirectly transferred to the materials in the dryer. Since the low-oxygen gas is exhaust gas discharged from the dryer, has a certain temperature, and forms a closed-loop circulation gas, the participation of the exhaust gas does not substantially consume additional heat, thereby causing heat loss due to excessive incorporation of air.
Example 5:
referring to the material calcining vertical kiln shown in fig. 8, a storage bin 11 for filling materials into the cylinder is arranged at the upper part of the cylinder of the vertical kiln, and a discharge opening 14 at the bottom of the cylinder is connected with a discharging device 15. The material enters the cylinder body through the bin, is calcined in the cylinder body and is cooled and discharged from the discharging device. The lower part of the cylinder is provided with a cooling air device for sending cooling air into the cylinder. Cooling air such as air from the cooling air device enters the cylinder body, and the temperature is raised after the cooling air exchanges heat with the calcined material to form combustion-supporting air. The flue gas discharged from the vertical kiln enters a dust remover for dust removal or a desulfurization device from the top of the cylinder and is introduced into a chimney through an induced draft fan for discharge.
The cylinder body is provided with a sudden change cross section, and when materials flow downwards in the cylinder body, a cavity which can not be naturally reached by the materials is formed at the sudden change cross section.
One path of kiln tail flue gas discharged from the upper part of the cylinder body of the vertical kiln is mixed with fuel and then enters a mixing channel 34 of the fuel and the kiln tail flue gas of the circumferential combustor 60, and the other path of kiln tail flue gas is mixed with combustion-supporting air and then enters a mixing channel 35 of the combustion-supporting air and the low-oxygen gas of the circumferential combustor 60. A tail gas pipeline connected with the inlet end of the fuel pressurizing fan is provided with a meter for detecting flow or/and pressure or/and temperature and an adjusting valve 100; and a tail gas pipeline connected with an inlet of the air blowing device 6 is provided with a meter for detecting flow or/and pressure or/and temperature and a regulating valve 100.
The peripheral burner 60 is a burner containing a low oxygen gas, and has an outlet port in the cavity. The circumferential combustor 60 has at least 1 channel communicated with kiln tail flue gas discharged from the upper part of the shaft kiln cylinder.
A central burner 70 may also be provided, and a portion of the kiln tail flue gas discharged from the upper part of the shaft of the vertical kiln is mixed with the fuel and then enters the fuel and kiln tail flue gas mixing channel of the central burner 70. The central burner 70 is a burner containing a low-oxygen gas, and has an outlet at the center of the shaft below the peripheral burner 60. The central burner 70 has at least 1 channel which is communicated with the kiln tail flue gas discharged from the upper part of the shaft kiln cylinder.
Of course, separate low-oxygen gas nozzles 50 may be provided to communicate directly with the peripheral cavity or/and the central cavity of the shaft kiln. The central burner 70 is replaced by a separate low-oxygen gas lance 50, i.e., the central burner 70 is not provided and a separate low-oxygen gas lance 50 is provided. The inlet end of the separate low-oxygen gas lance 50 is connected to a tail gas line, which is provided with a meter for detecting flow or/and pressure or/and temperature, and a regulating valve 100. At this time, the low oxygen gas-containing burner is composed of the circumferential burner 60 and the low oxygen gas nozzle 50.
The embodiment 5 is the case of the combustor/independent low-oxygen gas nozzle with the low-oxygen gas channel in the shaft kiln, which is a shaft kiln with a combustor in the circumferential direction of a kiln cylinder ring or/and in the center, wherein the fuel channel of the circumferential/central combustor is simultaneously connected with the circulating tail gas channel of the kiln, or/and the circulating flue gas is mixed in the combustion air channel, or/and the circumferential/central combustor comprises the circulating tail gas channel, or/and the independent low-oxygen gas nozzle, and the low-oxygen gas nozzle and the main combustor form a combustor group; the circulating tail gas channel comprises an adjusting valve 100 and a temperature pressure thermotechnical instrument and is used for adjusting the doping amount of the circulating tail gas, the number of the burners is determined according to the diameter of the kiln, and a booster fan can be arranged on the circulating tail gas channel.
Example 6:
referring to the material calcining vertical kiln shown in fig. 9, a storage bin 11 for filling materials into the cylinder is arranged at the upper part of the cylinder of the vertical kiln, and a discharge opening 14 at the bottom of the cylinder is connected with a discharging device 15. The material enters the cylinder body through the bin, is calcined in the cylinder body and is cooled and discharged from the discharging device. The lower part of the cylinder is provided with a cooling air device for sending cooling air into the cylinder. Cooling air such as air from the cooling air device enters the cylinder body, and the temperature is raised after the cooling air exchanges heat with the calcined material to form combustion-supporting air. The flue gas discharged from the vertical kiln enters a dust remover for dust removal or a desulfurization device from the top of the cylinder and is introduced into a chimney through an induced draft fan for discharge.
The kiln tail flue gas discharged from the upper part of the cylinder body of the vertical kiln is mixed with fuel and then enters the fuel and kiln tail flue gas mixing channel 34 of the beam type combustor 80, or/and the combustion air and low-oxygen gas mixing channel 35 which is mixed with the combustion air and then enters the beam type combustor 80. The fuel and kiln tail flue gas mixing channel 34 and the combustion air and low-oxygen gas mixing channel 35 are connected to the air inlet channel of the beam type combustor 80 together, and provide mixed gas for a plurality of nozzles. A tail gas pipeline connected with the inlet end of the fuel pressurizing fan is provided with a meter for detecting flow or/and pressure or/and temperature and an adjusting valve 100; and a tail gas pipeline connected with an inlet of the air blowing device 6 is provided with a meter for detecting flow or/and pressure or/and temperature and a regulating valve 100.
Of course, a separate low oxygen gas lance may be provided. The inlet end of the independent low-oxygen gas spray pipe is connected with a tail gas pipeline, and the tail gas pipeline connected with the inlet end of the low-oxygen gas spray pipe is provided with an instrument and an adjusting valve for detecting flow or/and pressure or/and temperature. At this time, the low-oxygen gas-containing burner is composed of the beam burner 80 and the low-oxygen gas nozzle.
The embodiment 6 is the case of a combustor/independent low-oxygen gas nozzle with a low-oxygen gas channel in a shaft kiln, which is a shaft kiln with a beam-type combustor in a kiln cylinder, wherein the beam-type combustor comprises a plurality of nozzles, a fuel channel of the beam-type combustor is simultaneously connected with a kiln circulating tail gas channel, or/and circulating flue gas is mixed in a combustion air channel, or/and the beam-type combustor comprises a circulating tail gas channel, or/and an independent low-oxygen gas nozzle, and the low-oxygen gas nozzle and a main combustor form a combustor group; the circulating tail gas channel comprises an adjusting valve 100 and a temperature pressure thermotechnical instrument and is used for adjusting the doping amount of the circulating tail gas, the number of the burners and the arrangement mode of the upper layer and the lower layer are determined according to the diameter of the kiln, and a booster fan can be arranged on the circulating tail gas channel.
For examples 5 and 6, the low-oxygen gas nozzles are separately arranged, and the outlets of the low-oxygen gas nozzles are positioned at the high temperature in the shaft kilnThe gas from the low-oxygen gas nozzle exchanges heat with the material (such as cooling the material, raising the temperature of the tail gas, then raising the temperature to the high-temperature region to exchange heat with the burning flame to reduce the temperature of the flame; a booster fan can be set midway in the tail gas discharge pipeline, and the main component of the kiln tail smoke is N 2 And CO 2 ，O 2 The content is about 2-16%, the flame formed by the burner can absorb heat to reduce the flame temperature, the temperature of the combustion gas can be controlled by controlling the flow of the low-oxygen gas, the temperature required by calcination is reached, and the generation of NOx in the combustion process is greatly reduced. At the same time, however, the low-oxygen gas absorbs heat and transfers the heat to the material after the temperature of the low-oxygen gas rises. Because the low-oxygen gas is tail gas discharged from the kiln tail, has a certain temperature and forms closed cycle gas, the participation of the kiln tail flue gas basically does not consume extra heat.
Claims (9)
1. A burner containing a low oxygen gas, comprising: the burner includes channels, at least one of which has an inlet end connected to a source of hypoxic gas.
2. The low oxygen gas-containing burner as set forth in claim 1, wherein: the combustor at least comprises a fuel and low-oxygen gas mixing channel, and the inlet ends of the fuel and low-oxygen gas mixing channel are respectively connected with a fuel source and a low-oxygen gas source.
3. The low oxygen gas-containing burner as set forth in claim 1, wherein: the burner at least comprises a low-oxygen gas channel; the inlet of the hypoxic gas channel is connected with the hypoxic gas source.
4. The low oxygen gas-containing burner as set forth in claim 1, wherein: the combustor at least comprises a combustion air and hypoxia gas mixing channel, and the inlet ends of the combustion air and hypoxia gas mixing channel are respectively connected with a combustion air source and a hypoxia gas source.
5. A burner containing a low oxygen gas, comprising: the device also comprises an independent hypoxia gas nozzle, and the inlet end of the hypoxia gas nozzle is connected with a hypoxia gas source.
6. The low oxygen gas-containing burner as set forth in claim 5, wherein: the low-oxygen gas is tail gas generated by a kiln or mixed gas of air and the tail gas.
7. The low oxygen gas-containing burner as set forth in claim 5, wherein: and a pipeline connected with the hypoxic gas source is provided with a meter for detecting flow or/and pressure or/and temperature and a regulating valve.
8. The low oxygen gas-containing burner as set forth in claim 5, wherein: the inlet end of at least one of the channels in the combustor is connected with a tail gas source discharged by the rotary kiln or the vertical kiln or the dryer.
9. The low oxygen gas-containing burner as set forth in claim 5, wherein: the pulverized coal/natural gas fuel channel of the burner is also connected with a tail gas source discharged by a rotary kiln or a vertical kiln or a dryer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220193640.9U CN217178518U (en) | 2022-01-24 | 2022-01-24 | Combustor containing low-oxygen gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220193640.9U CN217178518U (en) | 2022-01-24 | 2022-01-24 | Combustor containing low-oxygen gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217178518U true CN217178518U (en) | 2022-08-12 |
Family
ID=82737080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220193640.9U Active CN217178518U (en) | 2022-01-24 | 2022-01-24 | Combustor containing low-oxygen gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217178518U (en) |
-
2022
- 2022-01-24 CN CN202220193640.9U patent/CN217178518U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101269919B (en) | Vertical kiln apparatus for materials calcination | |
| CN106986561B (en) | Annular lime shaft kiln | |
| US8328550B2 (en) | Method and device for use of alternative fuels in clinker and cement production | |
| CN109574523B (en) | Lime kiln for directly burning high-temperature coal gas of gasification furnace in hot feeding manner | |
| CS199240B2 (en) | Apparatus for firing raw materials for manufacturing cement or the like | |
| CN102620573B (en) | Utilization method and system for tail gas of calcium carbide furnace | |
| CN113372024A (en) | Double-hearth kiln for calcining lime by using low-calorific-value fuel and calcining method | |
| CN104058606A (en) | Method and device for producing lime by oxygen-enriched combustion | |
| JP2004514866A5 (en) | ||
| CN111592241B (en) | Sleeve kiln low NOxCombustion process and low NOxCombustion sleeve kiln | |
| CN105605560B (en) | Micro- discharge pulverized coal combustion system | |
| JP2001046861A (en) | Calcination method of mineral substance | |
| CN217178518U (en) | Combustor containing low-oxygen gas | |
| CN218879751U (en) | Central burner type lime kiln | |
| CN102942312B (en) | Energy-saving environment-friendly lime shaft kiln | |
| CN114907034B (en) | Cement firing system and method capable of realizing rapid switching operation of air combustion and local oxy-fuel combustion | |
| CN103148477A (en) | Powder-screwing-in type pulverized coal combustion machine | |
| CN203947032U (en) | Oxygen-enriched combusting is produced the device of lime | |
| CN114321922A (en) | Combustor containing low-oxygen gas | |
| CN101070956A (en) | Coal-water slurry combustion method and its combustion equipment | |
| CN105271842A (en) | Method for calcining active lime by use of mixed gas in lime sleeve kiln | |
| CN113149470B (en) | External combustion annular sleeve kiln system and lime production method | |
| CN214693917U (en) | External combustion annular sleeve kiln system | |
| CN112648613B (en) | Combustor for annular sleeve kiln lower combustion chamber and flameless combustion method | |
| CN209685619U (en) | A kind of limekiln that the hot sending of gasification furnace coal gas of high temperature is directly burnt |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |