CN209952572U - Denitration integrated device - Google Patents
Denitration integrated device Download PDFInfo
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- CN209952572U CN209952572U CN201920277616.1U CN201920277616U CN209952572U CN 209952572 U CN209952572 U CN 209952572U CN 201920277616 U CN201920277616 U CN 201920277616U CN 209952572 U CN209952572 U CN 209952572U
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Abstract
The utility model discloses a denitration integrated device, which comprises a reducing agent conveying unit, a metering and distributing unit and a PLC control unit; the reducing agent conveying unit, the metering and distributing unit and the PLC control unit are integrated in a sealed cabinet. The utility model discloses a denitration integrated device, equipment are small, and the scene is arranged in a flexible way, do not receive the place restriction, and the open installation of doing can reduce civil engineering construction cost widely, is particularly useful for old line transformation installation space limited enterprise. The utility model discloses still can increase substantially denitration efficiency, can reach and obtain higher denitration effect with reductant consumption still less, reduce the running cost of whole SNCR system.
Description
Technical Field
The utility model relates to a cement dry process production line's denitration technique, concretely relates to denitration integrated device.
Background
The denitration system of the existing cement production enterprise is various in types, most of running equipment is huge, the structure is complex, the occupied area of the denitration equipment is large, the construction cost is high, the running cost of the denitration system is high, the denitration effect of some production lines is unsatisfactory, and the emission standard of atmospheric pollutants in the cement industry cannot be reached. Along with the stricter and stricter national requirements on the emission of nitrogen oxides in a cement clinker production line, a plurality of cement clinker production enterprises also pay more and more attention to the operation efficiency and the effect of a denitration system so as to reduce the operation cost of the denitration system and reduce the nitrogen oxides in outlet flue gas to 100mg/Nm3The following emission indexes.
An SNCR denitration technology, namely a selective non-catalytic reduction technology, is a method for reducing NOx in flue gas to generate nitrogen and water by spraying an amino-containing reducing agent (such as ammonia water, a urea solution and the like) into the flue gas of a boiler at the temperature of 850-1050 ℃ without using a catalyst. The SNCR method has good denitration effect, does not need a catalyst, has lower construction and operation cost than SCR, is favored by small and medium-sized cement production enterprises in recent years, and is a preferable denitration means for construction and technical improvement of production lines of the small and medium-sized cement production enterprises.
The SNCR denitration system generally comprises a reducing agent storage unit, a raw agent conveying unit, a metering and distributing unit and a PLC (programmable logic controller) control unit, wherein in the conventional SNCR denitration technology, all the units are independently arranged and are connected through pipelines and cables, so that the distribution is scattered, the occupied area is large, the construction cost is high, and the control and management are difficult. The existing SNCR denitration system has the defects of unstable control of the concentration of nitrogen oxides in outlet flue gas, high usage amount of reducing agents and high operation cost.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the utility model provides a denitration integrated device, which can greatly improve the denitration efficiency, can obtain higher denitration effect with less reducing agent consumption, and reduce the operation cost of the whole SNCR system; just the utility model discloses an adopt integrated mode to carry unit, measurement distribution unit and PLC the control unit integration in a sealed cabinet with former agent, equipment is small, and the scene is arranged in a flexible way, does not receive the place restriction, and the open installation of doing does can reduce civil engineering construction cost widely, is particularly useful for old line transformation installation space limited enterprise.
The utility model discloses a first technical scheme be: a denitration integrated device comprises a reducing agent conveying unit, a metering and distributing unit and a PLC control unit; the reducing agent conveying unit, the metering and distributing unit and the PLC control unit are integrated in a sealed cabinet, and the sealed cabinet is provided with a control button, an equipment operation indicator lamp, an air exhaust and internal illumination system and a touch screen; the reducing agent conveying unit is used for conveying the reducing agent from the reducing agent storage tank to the metering and distributing unit for metering and distributing and then conveying to the denitration unit; control button and touch-sensitive screen are used for denitration integrated device's manual operation, and equipment operation pilot lamp is used for showing denitration integrated device's equipment operation condition, and the illumination and the exhaust-gas discharge that air exhaust and interior lighting system are used for in the sealed cabinet, and PLC the control unit is used for controlling denitration integrated device's automatic operation.
The utility model discloses a second technical scheme be the improvement on first technical scheme, the utility model discloses a second technical scheme be: the reducing agent conveying unit comprises a variable-frequency plunger pump, a reducing agent input pipeline, a plunger pump inlet ball valve, a plunger pump outlet ball valve, a check valve, a safety valve, a pulse damper and a first reducing agent output pipeline; the reducing agent input pipeline is communicated with an inlet of the plunger pump through a plunger pump inlet ball valve, the first reducing agent output pipeline is communicated with an outlet of the variable-frequency plunger pump through a plunger pump outlet ball valve and a check valve in sequence, the pulse damper is communicated with an outlet of the variable-frequency plunger pump, and a connecting pipeline between the plunger pump outlet ball valve and the check valve is communicated with the inlet of the variable-frequency plunger pump through a safety valve.
The utility model discloses a third technical scheme be the improvement on the second technical scheme, the utility model discloses a third technical scheme be: the reducing agent conveying unit comprises two variable-frequency plunger pumps, each variable-frequency plunger pump is provided with an independent plunger pump inlet ball valve, a plunger pump outlet ball valve, a check valve, a safety valve and a pulse damper, a reducing agent input pipeline is communicated with inlets of the two variable-frequency plunger pumps through the plunger pump inlet ball valves respectively, and a first reducing agent output pipeline is communicated with outlets of the two variable-frequency plunger pumps through the plunger pump outlet ball valves and the check valves respectively.
The utility model discloses a fourth technical scheme be the improvement on the second technical scheme, the utility model discloses a fourth technical scheme be: the metering and distributing unit comprises a flowmeter, a filter, an electromagnetic regulating valve, a pressure transmitter, a second reducing agent output pipeline and a reducing agent return pipeline; the second reducing agent output pipeline is communicated with the first reducing agent output pipeline through a flowmeter and a filter in sequence, isolating valves are arranged in front of and behind the filter, and a pressure transmitter is arranged on an outlet pipeline of the flowmeter; the connecting pipeline between the flowmeter and the filter is communicated with a reducing agent return pipeline through an electromagnetic adjusting valve, and the reducing agent return pipeline conveys the returned reducing agent to a reducing agent storage tank.
The utility model discloses a fifth technical scheme be the improvement on the fourth technical scheme, the utility model discloses a fifth technical scheme be: the metering and distributing unit further comprises a manual regulating valve, a connecting pipeline between an outlet ball valve of the variable-frequency plunger pump and the filter is communicated with a reducing agent return pipeline through the manual regulating valve, and a pressure gauge is arranged on an inlet pipeline of the manual regulating valve.
The utility model discloses a sixth technical scheme be the improvement on the fourth technical scheme, the utility model discloses a sixth technical scheme be: and an inlet pipeline of the electromagnetic regulating valve is provided with a drain port.
The utility model discloses a seventh technical scheme be the improvement on the fourth technical scheme, the utility model discloses a seventh technical scheme be: the PLC control unit is electrically connected with the ammonia nitrogen online detection device at the flue gas discharge port of the denitration unit, and the PLC control unit is electrically connected with the variable-frequency plunger pump and the electromagnetic regulating valve.
The utility model has the advantages that:
1. the utility model discloses an adopt integrated mode to carry unit, measurement distribution unit and PLC the control unit integration in a sealed cabinet with former agent, equipment is small, and the scene is arranged in a flexible way, does not receive the place restriction, and the open-air installation of doing can reduce civil engineering construction cost widely.
2. The utility model discloses a frequency conversion plunger pump is as the output power of reductant, can obtain accurate reliable reductant output through the input frequency who adjusts frequency conversion plunger pump, the export of frequency conversion plunger pump sets up the pulse damper, pressure in the pipeline can be balanced to the pulse damper, the output pressure who makes frequency conversion plunger pump is more stable, reductant output is more controllable, reductant output can not appear and excessively cause ammonia escape to increase, corrode the phenomenon of peripheral equipment, the use cost of reductant has been reduced simultaneously.
3. The utility model discloses a PIC control unit makes the output quantity of reductant and exhanst gas outlet nitrogen oxide's emission concentration linear correlation, and adjusts the output quantity of reductant and exhanst gas outlet nitrogen oxide's emission concentration and match in real time through the two-step method, has guaranteed that exhanst gas outlet nitrogen oxide's concentration is stabilized at 100mg Nm3The following.
Drawings
Fig. 1 is a front view of the sealed cabinet body of embodiment 1 of the denitration integrated device of the present invention.
Fig. 2 is a first axial view of a combined module of the raw material feeding unit and the metering and distributing unit in the sealed cabinet according to embodiment 1 of the denitration integrated device of the present invention.
Fig. 3 is a schematic axial view of a combined module of the raw material feeding unit and the metering and distributing unit in the sealed cabinet according to embodiment 1 of the denitration integrated device of the present invention.
Fig. 4 is a schematic axial view of a combined module of the raw material feeding unit and the metering and distributing unit in the sealed cabinet according to embodiment 1 of the denitration integrated device of the present invention.
Fig. 5 is a schematic flow chart of embodiment 1 of the denitration integrated device of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and a preferred embodiment.
Referring to fig. 1 to 5, a denitration integrated device includes a reducing agent delivery unit, a metering and distributing unit, and a PLC control unit 4; the reducing agent conveying unit, the metering and distributing unit and the PLC control unit are integrated in a sealed cabinet. The PLC control unit is electrically connected with the reducing agent conveying unit, the metering and distributing unit and the online ammonia nitrogen detection device of the smoke discharge port.
In this embodiment, the reducing agent delivery unit and the metering and distributing unit are combined into a combined module, and the module includes two parallel-connected variable frequency plunger pumps 7, a reducing agent input pipeline, a reducing agent total output pipeline, two reducing agent output pipelines, an electromagnetic valve return pipeline and a manual regulating valve return pipeline.
Two variable frequency plunger pumps 7 are arranged on a sealing cabinet bottom plate through pump bases, pipeline pipe fittings and valves are arranged on the sealing cabinet bottom plate through pipeline brackets, and the sealing cabinet bottom plate is detachably arranged in a sealing cabinet through bolts. The variable frequency plunger pump 7 is electrically connected with the PLC control unit. Each variable frequency plunger pump is provided with a plunger pump inlet ball valve 6-1, a plunger pump outlet ball valve 6-2, a check valve 8, a safety valve 18 and a pulse damper 9.
One end of the reducing agent input pipeline extends out of the sealing cabinet, the extending end is provided with a reducing agent inlet 5, and the reducing agent inlet 5 is communicated with a reducing agent storage tank through a pipeline; the other end of the reducing agent input pipeline is respectively communicated with the inlets of the two variable-frequency plunger pumps 7 through plunger pump inlet ball valves 6-1. When the plunger pump is in normal operation, one plunger pump is opened and the other plunger pump is standby, the inlet ball valve 6-1 is opened and the other plunger pump is closed, and the inlet valve is synchronously switched when the pumps are switched.
The reducing agent main output pipeline is sequentially provided with a first ball valve, a filter 11, a second ball valve and a flowmeter 12 along the reducing agent output direction, an output pipe from the flowmeter 12 extends out of the sealing cabinet, the extending end is provided with a reducing agent outlet 17, and the reducing agent outlet 17 is connected with the denitration spray gun through a pipeline. And a pressure transmitter 16 is arranged at the outlet of the flowmeter 12, the flowmeter 12 and the pressure transmitter 16 are electrically connected with a PLC control unit, and when the pressure transmitter 16 monitors that the pipeline pressure of the reducing agent output pipeline is higher than the alarm set value and the flow value displayed by the flowmeter 12 still does not reach the numerical value required by denitrification, the PLC control unit sends out a spray gun blocking signal. The connecting pipeline of the second ball valve and the flowmeter 12 is communicated with an electromagnetic valve return pipeline through an electromagnetic adjusting valve 13, and the electromagnetic valve return pipeline conveys the returned reducing agent to a reducing agent storage tank. The inlet of the electromagnetic regulating valve 13 is provided with an exhaust valve 19 for exhausting air in the pipeline system and stabilizing the pipeline pressure.
One ends of the two reducing agent output pipelines are respectively communicated with the outlets of the two variable-frequency plunger pumps 7 through outlet ball valves 6-2 of the plunger pumps and check valves 8 in sequence, and the other ends of the two reducing agent output pipelines are communicated with a reducing agent main output pipeline and a manual regulating valve return pipeline through an angle cross 10. And a manual regulating valve 14 and a pressure gauge 15 are arranged on the return pipeline of the manual regulating valve, and the pressure gauge 15 is used for displaying the pipeline pressure of the reducing agent output pipeline. When the electromagnetic valve 13 fails, the reducing agent output by the plunger pump is partially returned to the reducing agent storage tank by opening the manual regulating valve 14.
The pulse damper 9 is communicated with the outlet of the variable frequency plunger pump 7 through a ball valve. The pulse damper is in the prior art, an elastic diaphragm is arranged in the pulse damper, the container is divided into an upper cavity and a lower cavity, the lower cavity is used for conveying liquid, and the upper cavity is filled with inert gas according to the using pressure. The ball valve is arranged in front of an inlet of the check valve 8 and is in a normally open state during normal operation, and after pulsating fluid from the variable-frequency plunger pump enters the pulse damper, the system can obtain stable liquid flow and pressure due to compressibility and instantaneous absorption of pulses due to gas. The ball valve is closed when the pulse damper needs to be replaced or overhauled, and the output of the reducing agent is not influenced.
And a connecting pipeline between the plunger pump outlet ball valve 6-2 and the check valve 8 is communicated with an inlet of the variable-frequency plunger pump 7 through a safety valve 18. When the system pressure suddenly increases and exceeds the set value of the safety valve 18, the safety valve 18 is automatically opened, so that the outlet and the inlet of the variable-frequency plunger pump are communicated, and the safe operation of the variable-frequency plunger pump is ensured.
PLC the control unit 4 is prior art, and on control module located the inside wall of seal cupboard through the screw, the top of seal cupboard was equipped with airs exhaust and inside lighting system 2, and the top of seal cupboard is equipped with airs exhaust and the both sides of inside lighting system 2 are equipped with the lifting hook, make things convenient for denitration integrated device's integral hoisting. The front side of the sealed cabinet is provided with a split cabinet door, and the cabinet door is provided with a handle. The left cabinet door is provided with a variable frequency plunger pump starting and stopping control button 1, an operation indicator lamp 101 of the variable frequency plunger pump is arranged below the control button 1, and the operation indicator lamp 101 comprises a red stopping indicator lamp, a green normal operation indicator lamp and a yellow fault maintenance indicator lamp. And a touch screen 3 is arranged on the right cabinet door, and the touch screen 3 is used for touch operation of the denitration integrated device and comprises setting and adjusting parameters.
The operation flow of the denitration integrated device of embodiment 1 is as follows:
reducing agents from a reducing agent storage tank respectively enter the integrated device through the inlet 5, are distributed by the plunger pump inlet ball valve 6-1 and then respectively enter the two variable-frequency plunger pumps 7. When the plunger pump is normally used, one plunger pump is opened and the other plunger pump is standby, the other inlet ball valve 6-1 is opened and the other inlet ball valve is closed, and the inlet valves are synchronously switched when the pumps are switched.
The reducing agent output by the variable frequency plunger pump 7 sequentially enters the filter 6 through the check valve 8 and the plunger pump outlet ball valve 6-2 to filter impurities in the reducing agent, enters the flowmeter 12 after exiting the filter, passes through the ammonia water outlet 17 after being measured, and finally reaches the denitration spray gun.
The reducing agent part output from the outlet of the flow meter 12 is controlled to flow back to the reducing agent storage tank through a solenoid valve return pipe and a solenoid valve 13.
Taking the denitration integrated apparatus of embodiment 1 as an example, the operation method of the apparatus will be described as follows:
1. when the ammonia nitrogen online detection device detects that the concentration of nitrogen oxides at a flue gas outlet is reduced, the PLC control unit firstly reduces the input frequency of the variable frequency plunger pump 7 so as to reduce the output flow of the variable frequency plunger pump and reduce the output of a reducing agent;
2. when the input frequency of the variable-frequency plunger pump 7 is reduced to a set value, the input frequency of the variable-frequency plunger pump is kept unchanged, the PLC control unit opens the electromagnetic regulating valve 13 to enable part of reducing agent output by the variable-frequency plunger pump to flow back to the reducing agent storage tank through the reducing agent return pipeline, and the output of the reducing agent is further reduced;
3. when the ammonia nitrogen online detection device detects that the concentration of nitrogen oxides at the flue gas outlet is increased, the PLC control unit closes the electromagnetic regulating valve 13, the input frequency of the variable-frequency plunger pump 7 is increased so as to improve the output flow of the variable-frequency plunger pump, and the output of the reducing agent is increased.
The input frequency of the variable-frequency plunger pump 7 is reduced to a set value, wherein the set value is the lowest value of the high-efficiency operation of the variable-frequency plunger pump, namely the maximum value of the heat productivity of the variable-frequency plunger pump in the high-efficiency operation range.
Parts which are not specifically described in the above description are prior art or can be realized by the prior art.
Claims (7)
1. A denitration integrated device comprises a reducing agent conveying unit, a metering and distributing unit and a PLC control unit; the device is characterized in that the reducing agent conveying unit, the metering and distributing unit and the PLC control unit are integrated in a sealed cabinet, and the sealed cabinet is provided with a control button, an equipment operation indicator lamp, an air exhaust and internal illumination system and a touch screen; the reducing agent conveying unit is used for conveying the reducing agent from the reducing agent storage tank to the metering and distributing unit for metering and distributing and then conveying to the denitration unit; control button and touch-sensitive screen are used for denitration integrated device's manual operation, and equipment operation pilot lamp is used for showing denitration integrated device's equipment operation condition, and the illumination and the exhaust-gas discharge that air exhaust and interior lighting system are used for in the sealed cabinet, and PLC the control unit is used for controlling denitration integrated device's automatic operation.
2. The denitration integrated apparatus of claim 1, wherein the reducing agent delivery unit comprises a variable frequency plunger pump, a reducing agent input pipeline, a plunger pump inlet ball valve, a plunger pump outlet ball valve, a check valve, a safety valve, a pulse damper and a first reducing agent output pipeline; the reducing agent input pipeline is communicated with an inlet of the plunger pump through a plunger pump inlet ball valve, the first reducing agent output pipeline is communicated with an outlet of the variable-frequency plunger pump through a plunger pump outlet ball valve and a check valve in sequence, the pulse damper is communicated with an outlet of the variable-frequency plunger pump, and a connecting pipeline between the plunger pump outlet ball valve and the check valve is communicated with the inlet of the variable-frequency plunger pump through a safety valve.
3. The denitration integrated apparatus of claim 2, wherein the reducing agent delivery unit comprises two variable frequency plunger pumps, each variable frequency plunger pump is provided with an independent plunger pump inlet ball valve, a plunger pump outlet ball valve, a check valve, a safety valve and a pulse damper, the reducing agent input pipeline is respectively communicated with inlets of the two variable frequency plunger pumps through the plunger pump inlet ball valve, and the first reducing agent output pipeline is respectively communicated with outlets of the two variable frequency plunger pumps through the plunger pump outlet ball valve and the check valve.
4. The integrated denitration apparatus of claim 2, wherein the metering and distributing unit comprises a flow meter, a filter, an electromagnetic regulating valve, a pressure transmitter, a second reducing agent output pipeline and a reducing agent return pipeline; the second reducing agent output pipeline is communicated with the first reducing agent output pipeline through a flowmeter and a filter in sequence, isolating valves are arranged in front of and behind the filter, and a pressure transmitter is arranged on an outlet pipeline of the flowmeter; the connecting pipeline between the flowmeter and the filter is communicated with a reducing agent return pipeline through an electromagnetic adjusting valve, and the reducing agent return pipeline conveys the returned reducing agent to a reducing agent storage tank.
5. The denitration integrated apparatus of claim 4, wherein the metering and distributing unit further comprises a manual regulating valve, a connecting pipeline between the outlet ball valve of the variable frequency plunger pump and the filter is communicated with the reducing agent return pipeline through the manual regulating valve, and a pressure gauge is arranged on an inlet pipeline of the manual regulating valve.
6. The denitration integrated apparatus of claim 4, wherein an evacuation port is provided in the inlet pipeline of the electromagnetic regulating valve.
7. The integrated denitration device of claim 4, wherein the PLC control unit is electrically connected with an ammonia nitrogen online detection device at a flue gas outlet of the denitration unit, and the PLC control unit is electrically connected with the variable frequency plunger pump and the electromagnetic regulating valve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920277616.1U CN209952572U (en) | 2019-03-05 | 2019-03-05 | Denitration integrated device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920277616.1U CN209952572U (en) | 2019-03-05 | 2019-03-05 | Denitration integrated device |
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| CN209952572U true CN209952572U (en) | 2020-01-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109865417A (en) * | 2019-03-05 | 2019-06-11 | 南京西普环保科技有限公司 | A kind of denitration integrated device and reducing agent flow rate adjusting method |
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2019
- 2019-03-05 CN CN201920277616.1U patent/CN209952572U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109865417A (en) * | 2019-03-05 | 2019-06-11 | 南京西普环保科技有限公司 | A kind of denitration integrated device and reducing agent flow rate adjusting method |
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