CN211668298U - Waste gas treatment device for tamping coke oven - Google Patents
Waste gas treatment device for tamping coke oven Download PDFInfo
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- CN211668298U CN211668298U CN202020302942.6U CN202020302942U CN211668298U CN 211668298 U CN211668298 U CN 211668298U CN 202020302942 U CN202020302942 U CN 202020302942U CN 211668298 U CN211668298 U CN 211668298U
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Abstract
The utility model discloses a waste gas treatment device for a tamping coke oven, which belongs to the field of waste gas treatment, and comprises an SCR (selective catalytic reduction) denitration system and a waste heat recovery system, wherein a waste gas outlet of the tamping coke oven is communicated with a flue gas inlet end of a flue gas heating device through a pipeline, a flue gas outlet end of the flue gas heating device is respectively communicated with an inlet end of the SCR denitration system and an SCR denitration system bypass through pipelines, the inlet end of the SCR denitration system is provided with a flue gas uniform distribution device, and a gas outlet of the SCR denitration system and a gas outlet end of the SCR denitration system bypass are both communicated with the inlet end of the waste heat recovery system through pipelines; the gas outlet end of a flue gas pipeline in the waste heat recovery system is communicated with an induced draft fan, and the gas outlet end of the induced draft fan is respectively communicated with the wet desulphurization tower and a chimney through pipelines; the waste gas treatment device of the scheme has the advantages of reasonable design and high denitration and waste heat recovery efficiency, can save the waste gas treatment cost and reduce the usage amount of coke oven gas.
Description
Technical Field
The utility model relates to a waste gas treatment field, specificly relate to a waste gas treatment device for tamping coke oven.
Background
Nitrogen Oxides (NO)X) Many kinds, mainly nitrogen monoxide (NO) and nitrogen dioxide (NO) causing air pollution2) Nitrogen oxide is harmful to environment and human body, and can penetrate into lung of human body to induce respiratory tract disease, and it and other pollutants can produce photochemical smog pollution under a certain condition, and in addition, nitrogen dioxide is one of the causes of acid rain. In 2003, the national environmental protection agency stipulates that newly-built thermal power plants must be provided with desulfurization and denitrification equipment, and the existing thermal power plants and non-electric industry equipment are modified.
The tamping coke oven is a side-mounted coke oven for charging coal and coking by a tamping method, the original content of NOx in the flue gas of the coke oven is higher due to the large-scale of the tamping coke oven and the heating mode of the coke oven gas, in the prior art, the waste gas treatment method of the tamping coke oven comprises desulfurization, denitrification, waste heat utilization and the like, and the emission concentration limit value in the regional air pollutant comprehensive emission standard is executed according to the control area from 11/1 of 2020, but at present, a large number of enterprises are still unreasonable in design of waste gas treatment equipment, so that the denitrification rate is low and the emission standard can not be met; in addition, the tamping coke oven waste gas treatment in the prior art also has the defects of low waste heat utilization rate, short service life of equipment and high waste gas treatment cost, so the design of the waste gas treatment device for the tamping coke oven, which has the advantages of reasonable design, low cost, high denitration rate and high waste heat utilization rate, has important significance for meeting the increasing environmental protection requirements of people and the beneficial development of industrialization in China.
Disclosure of Invention
The technical problem to be solved by the utility model is to provide a rational in design, denitration and waste heat recovery efficiency are high, can practice thrift the cost stamp-charging coke oven waste gas treatment device for.
In order to solve the above problem, the utility model provides a following technical scheme: a waste gas treatment device for a stamp-charging coke oven comprises an SCR denitration (selective catalytic reduction denitration technology) system and a waste heat recovery system, wherein a waste gas outlet of the stamp-charging coke oven is communicated with a flue gas inlet end of a flue gas heating device through a pipeline, a flue gas outlet end of the flue gas heating device is respectively communicated with an inlet end of the SCR denitration system and an SCR denitration system bypass through pipelines, a flue gas uniform distribution device is arranged at the inlet end of the SCR denitration system, and a gas outlet of the SCR denitration system and a gas outlet end of the SCR denitration system bypass are both communicated with the inlet end of the waste heat recovery system through pipelines; the waste heat recovery system comprises two waste heat recovery boilers connected in parallel, the situation that the whole system cannot be used due to equipment maintenance can be effectively avoided by the two waste heat recovery boilers connected in parallel, each waste heat recovery boiler comprises at least one evaporator connected in series through a flue gas pipeline, each evaporator is provided with a water inlet pipe, a water outlet pipe and a blow-off pipe, the water inlet pipes are communicated with water outlet ends of steam collectors, the air outlet pipes are connected with air inlet ends of the steam collectors, the steam collectors are used for collecting steam generated by the evaporators and supplying water sources to the evaporators, each steam collector is further provided with a water inlet, a steam outlet and an emergency water outlet, air outlet ends of the flue gas pipelines of the evaporators connected in series are communicated with an air preheater, each air preheater is provided with an air inlet and an air outlet, the air inlets are communicated with air fans through pipelines, the air outlets are communicated with a chimney, the air outlet end of the induced draft fan is respectively communicated with the wet desulphurization tower and the chimney through pipelines.
The SCR denitration system is used for removing nitrogen oxides in flue gas, and the principle is that the flue gas and ammonia gas in the SCR denitration system are uniformly mixed in an ammonia water evaporator and sprayed into a flue of an SCR denitration reactor through an ammonia spraying grid, NOx in the flue gas and the ammonia gas in the SCR denitration reactor are subjected to reduction reaction under the action of a catalyst to be converted into nitrogen gas and water, and the purpose of removing the NOx is achieved.
One of the functions of the flue gas heating device is to heat the flue gas which is about to enter the SCR denitration system, so as to ensure the temperature required by the normal operation of the SCR denitration system, namely the flue gas temperature is more than or equal to 280 ℃, and the other function of the flue gas heating device is to regularly heat and regenerate the catalyst in the SCR denitration system according to the system requirements, so as to improve the activity and prolong the service life of the catalyst;
the purpose of flue gas equipartition device is carried out rectification and equipartition to the flue gas to improve the equipartition effect that the flue gas got into SCR deNOx systems, make flue gas and ammonia and catalyst fully contact, and then reach the requirement that improves denitration efficiency.
The waste heat recovery system is used for introducing coke oven flue gas at about 290 ℃ after an SCR denitration system into the waste heat recovery system for heat recovery, namely, water is changed into saturated steam in an evaporator by the heat exchange principle, the saturated steam is collected and then supplied externally, in addition, the tail end of the evaporator is also provided with an air preheater which is used for heating air by taking the flue gas as a heat source, the heated air is used as chimney hot standby hot air, the waste heat recovery system is designed into a double-acting boiler, and part of air is heated while the saturated steam is produced, so that the whole system is simpler and easier to maintain, the occupied area is small, the temperature of the flue gas is reduced to about 160 ℃ after the waste heat recovery and enters a wet desulphurization system, therefore, the waste heat recovery system not only can reduce the temperature of the flue gas and generate the steam, but also can supply the chimney with the hot standby air, so as to ensure that the coke oven chimney has enough suction and is beneficial to saving the cost.
The application discloses tamping is exhaust treatment device for coke oven's theory of operation does: flue gas waste gas generated by the tamping coke oven passes through the flue gas heating device through a pipeline and then enters the SCR denitration system, the flue gas is subjected to denitration treatment after passing through the flue gas distribution device at the gas inlet end of the SCR denitration system, the flue gas is still at a higher temperature after denitration treatment, then the flue gas enters the waste heat recovery system, heat recovery is carried out on high-temperature flue gas, the high-temperature flue gas is subjected to heat exchange with water after passing through an evaporator, generated saturated steam is supplied after being collected by a steam collector, the flue gas subjected to heat exchange by the evaporator continuously passes through an air preheater and is subjected to heat exchange with air, the hot air subjected to heat exchange is used as heat of a chimney to prepare air, and meanwhile, the draught fan introduces the cooled flue gas into a wet desulphurization device or a chimney from the gas outlet end of the waste.
Further, in order to rectify and uniformly distribute the flue gas and improve the uniform distribution effect of the flue gas entering the SCR denitration system, the flue gas is fully contacted with ammonia gas and catalyst, and further the requirement of improving the denitration efficiency is met, the technical scheme of the utility model also comprises that the flue gas uniform distribution device is sequentially provided with a flue inlet pipe, a flow guide plate group and a distribution grid along the air inlet direction, one end of the flue inlet pipe close to the SCR denitration system is provided with an arc-shaped flue elbow, the inside of the flue elbow is obliquely downwards provided with the flow guide plate group, the flow guide plate group comprises a plurality of parallel flow guide plates which are arranged at equal intervals, the interval between the adjacent flow guide plates is between 400 and 700mm, and the arrangement direction of the flow guide plates is matched with the bending direction of; the distribution grid is a mesh screen with the width of 320-380mm, and the rear end of the distribution grid is a catalyst layer. The guide plate group arranged at the bend of the flue reduces the possibility of ash blockage, so that the operation safety of the reactor can be improved, the distribution grid enables the flue gas in the reactor to diffuse from a relatively concentrated central area to the peripheral poor area of flue gas distribution, the effect of uniform flue gas distribution is achieved, and the denitration reaction efficiency is improved.
As preferred, for furthest's improvement distribution grid's flue gas equipartition effect, and avoid distribution grid to the effect that blocks of flue gas, the technical scheme of the utility model also includes, distribution grid's mesh screen shape is the regular hexagon that the length of a side is 90-100 mm.
As preferredly, for improving denitration reaction catalytic effect, and then improve denitration efficiency, the technical scheme of the utility model still include, the catalyst that the catalyst layer set up is the manganese system SCR denitration catalyst of current known material.
In order to improve the heating efficiency of the flue gas heating device on the flue gas and save the heating cost, the flue gas heating device is provided with a coke oven gas inlet which is communicated with a direct heating type heating furnace through a pipeline. The flue gas heating device adopts purified coke oven gas as a heating source, and the heating furnace adopts a direct heating type heating mode, so that the advantages of low gas consumption, high heating efficiency and reduced coke oven gas consumption are achieved.
For security and the convenience that improves the flue gas heating device and use, guarantee SCR deNOx systems's normal operating simultaneously, the technical scheme of the utility model still include, flue gas heating device is equipped with flue gas temperature sensor and flame detector, and flue gas temperature sensor and flame detector electricity are connected with flue gas heating device's controller. The smoke heating device realizes automatic ignition manually, and a flame detector and a controller which are arranged in the device automatically cut off gas through an automatic cut-off valve when the heating furnace is flamed out, so that the safety of the use of the gas is ensured; in addition, the lowest continuous operation flue gas temperature of the SCR denitration system with normal operation capability is 280 ℃, and when the flue gas temperature sensor detects that the flue gas temperature is lower than 280 ℃, the controller temporarily starts the flue gas heating device to heat the flue gas, so that the SCR denitration system continuously and normally operates. In addition, the SCR catalyst is heated regularly through another function of the flue gas heating device controlled by the controller, so that the activity of the catalyst is improved, the regeneration function of the catalyst is realized, the activity and the service life of the catalyst are prolonged, the catalyst is regenerated regularly to recover the activity of the catalyst, and the service life of the catalyst can be prolonged.
As preferred, for improving waste heat recovery efficiency, the technical scheme of the utility model still include, the evaporimeter is the heat pipe formula evaporimeter, and the heat that its principle was the flue gas is passed to intraductal water by the heat pipe wall to make its vaporization, produced vapour, water mixture reach the steam pocket through the steam tedge, export through the steam main control valve again after concentrating the separation, because the heat pipe is constantly with the water of heat input water jacket intraductal like this to rise and descend through outside vapour-water pipeline and accomplish basic soda circulation, reach the hot-fluid cooling, and change into the purpose of steam.
The utility model has the advantages that: compared with the prior art, the utility model aims at providing a reasonable in design, denitration and waste heat recovery efficiency are high, can practice thrift the waste gas treatment device for the tamping coke oven of cost, in order to realize above-mentioned technological effect, firstly, the waste gas treatment device of this application is equipped with flue gas heating device, SCR deNOx systems, waste heat recovery system etc. can effectively handle the waste gas for the tamping coke oven and satisfy the emission requirement of the existing regulation of state, overall arrangement is compact reasonable;
secondly, the gas inlet end of the SCR denitration system is provided with a flue gas heating device, the flue gas heating device can effectively guarantee the requirement of the SCR denitration system on the temperature of flue gas, so that the SCR denitration system can be kept to operate continuously and normally, the denitration efficiency is improved, in addition, the flue gas heating device can regularly heat an SCR catalyst, the activity of the catalyst is improved, the regeneration function of the catalyst is realized, the activity of the catalyst is improved, the service life of the catalyst is prolonged, and the denitration efficiency is also improved while the activity of the catalyst is improved;
thirdly, a flue gas uniform distribution device is arranged in the SCR denitration system, and the flue gas uniform distribution device can rectify and uniformly distribute flue gas entering the SCR denitration system so as to improve the uniform distribution effect of the flue gas, ensure that the flue gas is fully contacted with ammonia gas and a catalyst, improve the reaction efficiency of reduction reaction and further achieve the aim of improving the denitration efficiency;
thirdly, the waste heat recovery device can effectively improve the efficiency of waste heat recovery by arranging the evaporator and the air preheater to carry out heat exchange on the flue gas, in addition, the waste heat recovery system is designed into a double-acting boiler, and part of air is heated while saturated steam is produced, so that the whole system is simpler and easier to maintain due to the design, the occupied area is small, the waste heat recovery system not only can reduce the temperature of the flue gas and produce steam, but also can supply hot standby air for a chimney so as to ensure that the coke oven chimney has enough suction, the reasonability of the design of the system is improved, and the cost is saved;
finally, after verification, when the NOx content of the smoke outlet of the tamping coke oven is 1200mg/Nm3, the smoke temperature is 230-3When the NOx content of the waste gas treated by the waste gas treatment device for the tamping coke oven is/h, the NOx content of the flue gas at the outlet of the system is less than or equal to 100mg/Nm3The temperature of the outlet flue gas is less than or equal to 160 ℃, the steam quantity of the waste heat recovery system at 0.6MPa and 160 ℃ is 12-18 t/h, and the denitration rate and the waste heat recovery rate are high, so that the operation cost of the waste gas treatment process is saved.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic view showing the construction of an exhaust gas treatment apparatus for a stamp-charging coke oven according to an embodiment;
FIG. 2 is a schematic structural diagram of a flue gas uniform distribution device in a specific embodiment;
FIG. 3 is a schematic view of a configuration of an embodiment of a baffle assembly;
fig. 4 is a schematic structural diagram of a waste heat recovery system in an embodiment.
The system comprises an SCR denitration system 1, a chimney 2, a tamping coke oven 3, a flue gas heating device 4, a coke oven gas inlet 5, a flue gas temperature sensor 6, a flame detector 7, a controller 8, an SCR denitration system bypass 9, a flue gas uniform distribution device 10, a flue gas inlet pipe 11, a guide plate group 12, a distribution grid 13, a catalyst layer 14, a waste heat recovery boiler 15, a heat pipe evaporator 16, a water inlet pipe 17, an air outlet pipe 18, a blow-off pipe 19, a steam collector 20, a water inlet 21, a steam outlet 22, an emergency water outlet 23, a flue gas pipe 24, an air preheater 25, an air fan 26, a valve 27, an induced draft fan 28 and a wet desulfurization tower 29.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are for simplicity of description, and are not intended to indicate or imply that the device or element so indicated must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting.
As can be seen from the attached drawing, the waste gas treatment device for the tamping coke oven comprises an SCR denitration system 1 and a waste heat recovery system, wherein a waste gas outlet of the tamping coke oven 3 is communicated with a flue gas inlet end of a flue gas heating device 4 through a pipeline;
the flue gas heating device 4 is provided with a coke oven gas inlet 5, and the coke oven gas inlet 5 is communicated with a direct heating type heating furnace through a pipeline; the flue gas heating device 4 is provided with a flue gas temperature sensor 6 and a flame detector 7, the flue gas temperature sensor 6 and the flame detector 7 are electrically connected with a controller 8 of the flue gas heating device 4, and the controller 8 is provided with a switch for controlling the start and stop of the flue gas heating device 4 and a switch for controlling a valve of a coke oven gas pipeline;
the flue gas outlet end of the flue gas heating device 4 is respectively communicated with the gas inlet end of the SCR denitration system 1 and the SCR denitration system bypass 9 through a pipeline, and the gas inlet end of the SCR denitration system 1 is provided with a flue gas uniform distribution device 10;
the flue gas uniform distribution device 10 is sequentially provided with a flue gas inlet pipeline 11, a flow guide plate group 12 and a distribution grid 13 along the gas inlet direction, one end of the flue gas inlet pipeline 11 close to the SCR denitration system 1 is provided with an arc-shaped flue elbow, the flow guide plate group 12 is obliquely and downwards arranged in the flue elbow, the flow guide plate group 12 comprises a plurality of flow guide plates which are arranged in parallel at equal intervals, the interval between the adjacent flow guide plates is between 400 and 700mm, and the arrangement direction of the flow guide plates is matched with the bending direction of the flue elbow; the distribution grid 13 is a mesh screen with the width of 320-380mm, the mesh screen is in the shape of a regular hexagon with the side length of 90-100mm, and the rear end of the distribution grid 13 is a manganese SCR denitration catalyst layer 14;
the gas outlet of the SCR denitration system 1 and the gas outlet end of the SCR denitration system bypass 9 are communicated with the gas inlet end of the waste heat recovery system through pipelines; the waste heat recovery system comprises two waste heat recovery boilers 15 which are connected in parallel, the waste heat recovery boilers 15 comprise four heat pipe type evaporators 16 which are connected in series through flue gas pipelines 24, each heat pipe type evaporator 16 is provided with a water inlet pipe 17, a gas outlet pipe 18 and a blow-off pipe 19, the water inlet pipe 17 is communicated with a water outlet end of a steam collector 20, the gas outlet pipe 18 is connected with a gas inlet end of the steam collector 20, the steam collector 20 is also provided with a water inlet 21, steam outlet 22, urgent delivery port 23, the end intercommunication of giving vent to anger of the flue gas pipeline 24 of series connection heat pipe formula evaporimeter 16 has air heater 25, air heater 25 is equipped with air inlet and air outlet, air inlet has air fan 26 through the pipeline intercommunication, the air outlet passes through the pipeline and communicates with chimney 2, the end of giving vent to anger of flue gas pipeline 24 is equipped with valve 27 and communicates with draught fan 28 among the waste heat recovery system, the end of giving vent to anger of draught fan 28 passes through the pipeline and communicates with wet flue gas desulfurization tower 29 and chimney 2 respectively.
Flue gas waste gas generated by the tamping coke oven passes through the flue gas heating device through a pipeline and then enters the SCR denitration system, the flue gas is subjected to denitration treatment after passing through the flue gas distribution device at the gas inlet end of the SCR denitration system, the flue gas after denitration treatment still has higher temperature and then enters the waste heat recovery system, heat recovery is carried out on high-temperature flue gas, the high-temperature flue gas is subjected to heat exchange with water after passing through the evaporator, generated saturated steam is collected by a steam collector, the flue gas after heat exchange of the evaporator continuously passes through an air preheater and is subjected to heat exchange with air, the temperature of the flue gas is further reduced, the hot air after heat exchange is used as heat of a chimney to be prepared with air, and meanwhile, the draught fan introduces the cooled flue gas into a wet desulphurization device or a chimney from the gas outlet end of the waste heat.
The application of the waste gas treatment device has the beneficial effects of high denitration efficiency, high waste heat recovery efficiency and low operation cost.
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. The utility model provides a waste gas treatment device for tamping coke oven which characterized in that: the waste gas outlet of the tamping coke oven is communicated with the flue gas inlet end of a flue gas heating device through a pipeline, the flue gas outlet end of the flue gas heating device is respectively communicated with the inlet end of the SCR denitration system and a SCR denitration system bypass through pipelines, the inlet end of the SCR denitration system is provided with a flue gas uniform distribution device, and the gas outlet of the SCR denitration system and the gas outlet end of the SCR denitration system bypass are both communicated with the inlet end of the waste heat recovery system through pipelines; waste heat recovery system includes two parallelly connected waste heat recovery boilers, waste heat recovery boiler includes an at least evaporimeter through the flue gas pipeline series connection, and the evaporimeter is equipped with inlet tube, outlet duct, blow off pipe, and the inlet tube intercommunication has the water outlet end of steam collector, and the outlet duct is connected with the inlet end of steam collector, steam collector still is equipped with water inlet, steam outlet, urgent delivery port, and the end intercommunication of giving vent to anger of the flue gas pipeline of series connection evaporimeter has air heater, air heater is equipped with air inlet and air outlet, air inlet has air fan through the pipeline intercommunication, and the air outlet passes through pipeline and chimney intercommunication, flue gas pipeline's the end intercommunication of giving vent to anger has the draught fan among the waste heat recovery system, the end of giving vent to anger of draught fan passes through the pipeline and communicates with wet flue gas.
2. The exhaust gas treatment device for the stamp-charging coke oven according to claim 1, wherein: the flue gas uniform distribution device is sequentially provided with a flue gas inlet pipe, a flow guide plate group and a distribution grid along the gas inlet direction, one end of the flue gas inlet pipe, which is close to the SCR denitration system, is provided with an arc-shaped flue elbow, the flow guide plate group is obliquely and downwards arranged in the flue elbow and comprises a plurality of flow guide plates which are arranged in parallel at equal intervals, the interval between every two adjacent flow guide plates is between 400 plus materials and 700mm, and the arrangement direction of the flow guide plates is matched with the bending direction of the flue elbow; the distribution grid is a mesh screen with the width of 320-380mm, and the rear end of the distribution grid is a catalyst layer.
3. The exhaust gas treatment device for the stamp-charging coke oven according to claim 2, wherein: the mesh screen of the distribution grid is in the shape of a regular hexagon with the side length of 90-100 mm.
4. The exhaust gas treatment device for the stamp-charging coke oven according to claim 2, wherein: the catalyst arranged on the catalyst layer is a manganese series SCR denitration catalyst.
5. The exhaust gas treatment device for the stamp-charging coke oven according to claim 1, wherein: the flue gas heating device is provided with a coke oven gas inlet which is communicated with a directly-heated heating furnace through a pipeline.
6. The exhaust gas treatment device for the stamp-charging coke oven according to claim 1, wherein: the flue gas heating device is provided with a flue gas temperature sensor and a flame detector, and the flue gas temperature sensor and the flame detector are electrically connected with a controller of the flue gas heating device.
7. The exhaust gas treatment device for the stamp-charging coke oven according to claim 1, wherein: the evaporator is a heat pipe type evaporator.
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| CN202020302942.6U CN211668298U (en) | 2020-03-12 | 2020-03-12 | Waste gas treatment device for tamping coke oven |
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| CN202020302942.6U CN211668298U (en) | 2020-03-12 | 2020-03-12 | Waste gas treatment device for tamping coke oven |
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