CN212376731U

CN212376731U - Generating set tail gas cleanup unit

Info

Publication number: CN212376731U
Application number: CN202020948789.4U
Authority: CN
Inventors: 晏国云; 杜剑峰
Original assignee: MPMC POWERTECH CORP
Current assignee: MPMC POWERTECH CORP
Priority date: 2020-05-29
Filing date: 2020-05-29
Publication date: 2021-01-19
Anticipated expiration: 2030-05-29

Abstract

The utility model relates to a generating set tail gas cleanup unit, first flue gas pipeline is connected with the air inlet of SCR catalyst converter, the second flue gas pipeline is connected with the gas outlet of SCR catalyst converter, black cigarette filters purifier and atomizing nozzle and installs on first flue gas pipeline and atomizing nozzle is located black cigarette filter purifier's low reaches along flue gas flow direction, flowmeter and first nitrogen oxide sensor install on first flue gas pipeline and be located between black cigarette filter purifier and the atomizing nozzle, jet pump and atomizing nozzle pass through the tube coupling, urea solution storage jar passes through the tube coupling with jet pump, air compressor passes through the tube coupling with atomizing nozzle, flowmeter and first nitrogen oxide sensor are connected with the controller, flowmeter and first nitrogen oxide sensor transmit detected signal to the controller and through the operation of controller control air compressor and jet pump. The utility model discloses can reduce the emission of oxynitride and black smoke particulate matter in the tail gas, have good noise reduction effect.

Description

Generating set tail gas cleanup unit

Technical Field

The utility model belongs to the technical field of tail gas treatment, especially, relate to a generating set tail gas cleanup unit.

Background

The diesel generator set is a small and medium power generation equipment, and a diesel engine is used as a prime mover to drive a power generator to generate power. The tail gas of the diesel engine is the tail gas sprayed out after the diesel engine burns diesel oil, the tail gas contains different compounds, and the gas emission is not only strange in smell, but also is faint and nausea, and influences the health of people. The research on the principle, method and technology of catalytic purification of diesel engine exhaust pollutants is one of the hot and difficult subjects in the field of environmental protection in the world, and as environmental regulations become stricter, the pollution of diesel engine exhaust pollutants to the environment and the harm to human health are more and more paid attention by people.

The tail gas of the existing diesel generator set is discharged through a flue gas pipeline, and the flue gas pipeline carries a common silencer to reduce noise. The existing tail gas emission structure mainly has the following problems: firstly, nitrogen oxides in the discharged tail gas exceed the standard; secondly, in the initial starting stage of the diesel generating set, a small amount of residual diesel oil is stored in the cylinder, and the diesel oil is incompletely combusted during starting, so that a large amount of black smoke particles are generated and discharged; thirdly, the noise reduction effect of the existing unit silencer is not obvious, and the silencer can occupy a large space.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a generating set tail gas cleanup unit is provided, nitrogen oxide and black smoke particulate matter's emission in the reduction tail gas avoids using special muffler and can reach good noise reduction effect.

The technical scheme that the utility model adopts for solving the technical problem is to provide a generating set tail gas purification device, which comprises a first flue gas pipeline and a second flue gas pipeline, wherein one end of the first flue gas pipeline is connected with a generating set tail gas port, the generating set tail gas purification device also comprises a black smoke filtering and purifying device, a flowmeter, a first oxynitride sensor, an atomizing nozzle, an injection pump, a urea solution storage tank, an SCR catalyst, an air compressor and a controller, the other end of the first flue gas pipeline is connected with an air inlet of the SCR catalyst, one end of the second flue gas pipeline is connected with an air outlet of the SCR catalyst, the black smoke filtering and purifying device and the atomizing nozzle are arranged on the first flue gas pipeline, the atomizing nozzle is positioned at the downstream of the black smoke filtering and purifying device along the flue gas flowing direction, the flowmeter and the first oxynitride sensor are arranged on the first flue gas pipeline and positioned between the black smoke filtering and purifying device and the atomizing nozzle, the injection pump passes through the tube coupling with the atomizing nozzle, urea solution storage jar passes through the tube coupling with the injection pump, air compressor passes through the tube coupling with the atomizing nozzle, flowmeter and first nitrogen oxide sensor are connected with the controller, flowmeter and first nitrogen oxide sensor will detect signal transmission to controller and through the operation of controller control air compressor and injection pump.

The black smoke filtering and purifying device is provided with a DPF ceramic filter element.

The flow meter is mounted upstream of the first nox sensor.

A first temperature sensor is installed at a position, close to an air inlet of the SCR catalyst, of the first flue gas pipeline, a second temperature sensor is installed at a position, close to an air outlet of the SCR catalyst, of the second flue gas pipeline, and the first temperature sensor and the second temperature sensor are connected with the controller respectively.

And an air filter is arranged on a pipeline between the air compressor and the atomizing nozzle.

And a solution filter is arranged on a pipeline between the urea solution storage tank and the liquid inlet interface of the jet pump.

Advantageous effects

First, the utility model discloses in, tail gas is handled through black cigarette filter purification device after following generating set discharge, can carry out effectual holding back to black cigarette particulate matter and adsorb to the problem that black cigarette discharged when can solving generating set start.

Second, the utility model discloses in, can be to the interior urea solution that sprays of flue gas pipeline through urea injection system, utilize high temperature in the flue gas pipeline to take place to hydrolyze and pyrolytic reaction generates the required reductant NH of SCR catalyst catalytic reduction₃And the nitrogen oxide in the tail gas and the SCR catalyst are subjected to selective reduction reaction to generate harmless nitrogen and water, so that the emission of the nitrogen oxide in the tail gas can be effectively reduced. In addition, in the process, the flow rate of the exhaust gas and the concentration of the nitrogen oxide are detected by the flow meter and the first nitrogen oxide sensor and fed back to the control system, and the control system can control the atomization injection amount of the urea by controlling the air compressor and the injection pump, so that the reducing agent NH can be controlled₃The amount of the generated ammonia gas is controlled, and secondary pollution caused by excessive ammonia gas is avoided.

Third, the utility model discloses a to spraying in the flue gas pipeline, can reach the function that the spark was extinguished, can cool down tail gas simultaneously, avoid the thermal pollution that high temperature exhaust emission caused.

Fourth, the utility model discloses in, black cigarette filtration purification device and SCR catalyst converter are micropore core structure, can exert good function of making an uproar of inhaling, have avoided need to carry on special silencer.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic diagram of the present invention.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

The tail gas purification device for the generator set shown in fig. 1 comprises a first flue gas pipeline 1, a second flue gas pipeline 2, a black smoke filtering and purifying device 3, a flow meter 4, a first nitrogen oxide sensor 5, an atomizing nozzle 6, an injection pump 7, a urea solution storage tank 8, an SCR catalyst 9, an air compressor 10 and a controller 11.

One end of the first flue gas pipeline 1 is connected with a tail gas port of the generator set, and the other end of the first flue gas pipeline is connected with a gas inlet of the SCR catalyst 9. One end of the second flue gas pipeline 2 is connected with the gas outlet of the SCR catalyst 9, and the other end is a tail gas outlet.

On the first flue gas pipeline 1, along the flow direction of flue gas, install black cigarette filtration purification device 3, flowmeter 4, first oxynitride sensor 5 and atomizing nozzle 6 in proper order.

Black cigarette filters purifier 3 and adopts DPF (granule trapper) ceramic filter core, can effectively intercept the particulate matter in the waste gas, especially wet granule, and Particulate Matter (PM) gets rid of efficiency more than 95%, reduces the emission of particulate matter, solves the black cigarette emission problem when generating set starts.

The injection pump 7 is connected with the atomizing nozzle 6 through a pipeline, and the injection port of the atomizing nozzle 6 is positioned inside the first flue gas pipeline 1 and used for injecting the urea solution into the first flue gas pipeline 1. Urea solution storage jar 8 is used for storing urea solution, and urea solution storage jar 8 passes through the feed liquor interface connection of pipeline with jet pump 7, and jet pump 7's backward flow interface passes through the pipe connection to urea solution storage jar 8. The injection pump 7 is a power element of the urea injection system and is used for sucking the urea solution from the urea solution storage tank 8 when the diesel engine normally works and returning the urea solution in the pipeline and the atomizing nozzle 6 to the urea solution storage tank 8 when the diesel engine stops working. The air compressor 10 is connected with the atomizing nozzle 6 through a pipeline, and an air filter is arranged on the pipeline and used for providing air required by the atomizing nozzle 6 in the spraying process. The above structure corresponds to the urea injection system shown in fig. 2.

The SCR catalyst 9 is a direct application of existing products. The SCR catalyst 9 uses ammonia as a reducing agent when in operation. By spraying a proper amount of urea aqueous solution into the tail gas, urea liquid drops are subjected to hydrolysis and pyrolysis reaction under the action of high-temperature waste gas to generate the required reducing agent (NH)₃). The ammonia reacts with the nitrogen oxide in the tail gas under the action of the catalyst in the SCR catalyst 9, and finally nitrogen and water which are harmless to the atmosphere are generated and discharged to the external environment. Urea solution in high-temperature flue gas pipeline>180 ℃) to generate ammonia gas and isocyanic acid through thermal cracking, and then the isocyanic acid further reacts with water to generate ammonia gas and carbon dioxide, wherein the main reactions are as follows:

(NH₂)₂CO→HNCO+NH₃

HNCO+H₂O→CO₂+NH₃

flowmeter 4 and first oxynitride sensor 5 are connected with controller 11, and flowmeter 4 and first oxynitride sensor 5 detect the exhaust gas flow in first flue gas pipeline 1 and the concentration of ammonia nitrogen compound, will detect signal transmission to controller 11 and, through the operation of controller 11 control air compressor 10 and jet pump 7, can control the atomizing injection volume of urea to can be to reductant NH₃The amount of the generated ammonia gas is controlled, and secondary pollution caused by excessive ammonia gas is avoided.

A first temperature sensor 12 is arranged at a position, close to an air inlet of the SCR catalyst 9, on the first flue gas pipeline 1, a second temperature sensor 13 is arranged at a position, close to an air outlet of the SCR catalyst 9, on the second flue gas pipeline 2, and the first temperature sensor 12 and the second temperature sensor 13 are respectively connected with a controller 11. The controller 11 is provided with a display screen for displaying the exhaust flow, the concentration of nitrogen oxides before and after catalytic reduction treatment and the temperature before and after the catalytic reduction treatment, so that the whole system can be observed and debugged by workers conveniently.

Claims

1. The utility model provides a generating set tail gas cleanup unit, includes first flue gas pipeline (1) and second flue gas pipeline (2), first flue gas pipeline (1) one end is connected its characterized in that with generating set tail gas mouth: the device is characterized by further comprising a black smoke filtering and purifying device (3), a flow meter (4), a first oxynitride sensor (5), an atomizing nozzle (6), an injection pump (7), a urea solution storage tank (8), an SCR catalyst (9), an air compressor (10) and a controller (11), wherein the other end of the first smoke pipeline (1) is connected with an air inlet of the SCR catalyst (9), one end of the second smoke pipeline (2) is connected with an air outlet of the SCR catalyst (9), the black smoke filtering and purifying device (3) and the atomizing nozzle (6) are installed on the first smoke pipeline (1), the atomizing nozzle (6) is located at the downstream of the black smoke filtering and purifying device (3) along the smoke flowing direction, the flow meter (4) and the first oxynitride sensor (5) are installed on the first smoke pipeline (1) and located between the black smoke filtering and purifying device (3) and the atomizing nozzle (6), the device is characterized in that the injection pump (7) is connected with the atomizing nozzle (6) through a pipeline, the urea solution storage tank (8) is connected with the injection pump (7) through a pipeline, the air compressor (10) is connected with the atomizing nozzle (6) through a pipeline, the flow meter (4) and the first oxynitride sensor (5) are connected with the controller (11), and the flow meter (4) and the first oxynitride sensor (5) transmit detection signals to the controller (11) and control the operation of the air compressor (10) and the injection pump (7) through the controller (11).

2. The tail gas purification device for the generator set according to claim 1, characterized in that: the black smoke filtering and purifying device (3) is provided with a DPF ceramic filter element.

3. The tail gas purification device for the generator set according to claim 1, characterized in that: the flow meter (4) is mounted upstream of the first nox sensor (5).

4. The tail gas purification device for the generator set according to claim 1, characterized in that: first temperature sensor (12) are installed to the position that is close to SCR catalyst (9) air inlet on first flue gas pipeline (1), second temperature sensor (13) are installed to the position that is close to SCR catalyst (9) gas outlet on second flue gas pipeline (2), first temperature sensor (12) and second temperature sensor (13) are connected with controller (11) respectively.

5. The tail gas purification device for the generator set according to claim 1, characterized in that: an air filter is arranged on a pipeline between the air compressor (10) and the atomizing nozzle (6).

6. The tail gas purification device for the generator set according to claim 1, characterized in that: and a solution filter is arranged on a pipeline between the urea solution storage tank (8) and a liquid inlet interface of the jet pump (7).