CN216588771U

CN216588771U - Spraying and absorbing diesel engine tail gas purification treatment device

Info

Publication number: CN216588771U
Application number: CN202120971227.6U
Authority: CN
Inventors: 张全来; 雷逸群; 丁冬兵; 王刚; 王爱军; 冷文明; 杜武; 回毅
Original assignee: WUHAN YUANFANG SCIENCE & TECHNOLOGY Co Ltd OF CHINA SANJIANG SPACE GROUP
Current assignee: WUHAN YUANFANG SCIENCE & TECHNOLOGY Co Ltd OF CHINA SANJIANG SPACE GROUP
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2022-05-24
Anticipated expiration: 2031-05-08

Abstract

The utility model provides a spray and absorb diesel engine tail gas purification processing apparatus, includes flue gas filter DPF and sprays the scrubbing tower, flue gas filter DPF and spraying the scrubbing tower intercommunication, diesel engine tail gas is in proper order through flue gas filter DPF and the evacuation after spraying the scrubbing tower and purifying. After the early-stage DPF purification post-treatment, 95 percent of particulate emissions can be filtered out, and only NO is left_XAnd the like, the acid gas is mixed,the problems that the filler in the washing equipment is easily blocked by particles, so that the gas-liquid flow resistance is increased, the washing and purifying effects are influenced, the back pressure of an engine is increased, the power consumption is increased, the diesel engine is easy to operate and the like are solved; because of the accumulation of particle emission in tail gas, impurities in the spraying solution of the spraying equipment are increased, the concentration is reduced, after the concentration of the spraying solution is reduced, urea can be directly added into the solution to improve the concentration of the solution, and the process is simple and rapid.

Description

Spray absorption diesel engine tail gas purification treatment device

Technical Field

The utility model relates to the technical field of tail gas treatment, in particular to a device for filtering and purifying tail gas discharged by a diesel engine by adopting a Diesel Particulate Filter (DPF) and a washing and purifying spray tower, and a tail gas purification treatment device for a spray absorption diesel engine.

Background

The diesel engine is widely applied to industries such as industry, agriculture, transportation and the like because of high thermal efficiency and relatively high torque, however, compared with the gasoline engine, the diesel engine has lower HC and CO in waste emission, but has higher NOx and particulate emission, particularly the particulate emission is 30-60 times higher, meanwhile, as the carbon smoke is the main component of the particulate emission of the diesel engine, the carbon smoke usually accounts for 50-80% of the total amount of the particulate, the carbon particles are fine or ultrafine nano-scale carbon smoke particles formed when fuel is combusted under the anoxic condition, and because of small diameter, the carbon particles can be suspended in the atmosphere for a long time without sedimentation, and soluble organic matters such as HC and sulfate adsorbed on the carbon particles are harmful to human bodies. Therefore, the problem of diesel particulate emissions has attracted considerable attention worldwide, and particularly with the increasing worsening of environmental concerns and tightening of diesel emission regulations, particulate traps are becoming an integral means of reducing diesel emissions. At present, a spray washing mode can be generally adopted for purifying tail gas generated by a diesel engine, and a patent 201821440698.9 'urea solution recovery device and tail gas treatment device for a diesel generator' discloses a urea solution recovery device for a diesel generator, which comprises a liquid inlet communicated with the bottom of a urea solution spraying cavity, a circulating power device and a liquid outlet thereon, wherein the liquid outlet is communicated with a urea solution supply port of the urea solution spraying device; the urea liquid at the bottom of the urea liquid spraying cavity can enter the circulating power device through the liquid inlet and is sent to the urea liquid supply port and sent back to the urea liquid spraying device; the tail gas treatment device for the diesel generator comprises a urea liquid spraying chamber, a urea liquid spraying device arranged in the urea liquid spraying chamber and a urea liquid recovery device for treating the tail gas of the diesel generator. The disadvantages are that: tail gas directly enters the urea liquid spraying device, a pre-treatment process is not carried out, and particulate emissions in the tail gas are not filtered, so that the subsequent spraying, absorbing and purifying effects are not ideal; when the tail gas which is not filtered passes through the spraying device, the carried particles easily block the filler in the washing equipment, so that the gas-liquid flow resistance is increased, the washing and purifying effect is influenced, the back pressure of the engine is increased, the power consumption is increased, and the problems that the diesel engine is difficult to operate and the like easily occur; in addition, due to the accumulation of particulate emissions in the tail gas, impurities in the spraying solution of the existing spraying equipment are increased, the concentration is reduced, the spraying solution must be replaced periodically, and the process is complicated, time-consuming and labor-consuming.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provide the tail gas purification treatment device of the diesel engine, which is not easy to block and has good purification effect.

The technical scheme of the utility model is as follows:

the utility model provides a spray and absorb diesel engine tail gas purification processing apparatus, includes flue gas filter DPF and sprays the scrubbing tower, flue gas filter DPF and spraying the scrubbing tower intercommunication, diesel engine tail gas is in proper order through flue gas filter DPF and the evacuation after spraying the scrubbing tower and purifying.

Further, the diesel engine tail gas purification processing apparatus, its characterized in that: the device also comprises a vortex booster pump, wherein the vortex booster pump is used for increasing the air inlet pressure of the tail gas of the diesel engine through the spray washing tower.

Further, the number of the DPF of the smoke filter is one or more and is used in parallel.

Further, when the quantity of flue gas filter DPF was a plurality of parallelly connected uses, still include flue gas shunt and flue gas ware that converges, the flue gas shunt is installed in a plurality of parallelly connected flue gas filter DPF front ends, the flue gas ware that converges is installed in a plurality of parallelly connected flue gas filter DPF rear ends, the flue gas ware that converges communicates with spray scrubbing tower.

Preferably, the number of the flue gas filters DPF is two and used in parallel.

Further, the flue gas converging device is communicated with the spray washing tower through a connecting pipe, and the connecting pipe is connected with the vortex booster pump.

Further, the spray washing tower is of a multi-layer spray structure.

Further, diesel engine tail gas clean-up processing apparatus still include the cabinet body, flue gas shunt, flue gas filter DPF, flue gas converge the ware, swirl booster pump, circulating water pump, spray scrubber all install in the cabinet internally.

Furthermore, a bent smoke outlet is arranged above the cabinet body and communicated with the top end of the spraying washing tower.

Further, a water pump pressure control screen is installed on the front face of the cabinet body, and the control screen is electrically connected with the vortex booster pump and the circulating water pump.

Compared with the prior art, the utility model has the advantages that:

1. after the early-stage DPF purification post-treatment, 95 percent of particulate emissions can be filtered out, and only NO is left_XThe acidic gas solves the problems that the particulate matter is easy to block the filler in the washing equipment, so that the gas-liquid flow resistance is increased, the washing and purifying effects are influenced, the backpressure of the engine is increased, the power consumption is increased, the diesel engine is easy to operate and the like;

2. because of the accumulation of particle emission in tail gas, impurities in the spraying solution of the spraying equipment are increased, the concentration is reduced, after the concentration of the spraying solution is reduced, urea can be directly added into the solution to improve the concentration of the solution, and the process is simple and rapid.

Drawings

FIG. 1 is a schematic structural diagram of a spray absorption diesel engine tail gas purification treatment device related to the utility model

Wherein, the device comprises a 1-flue gas splitter, a 2-first DPF flue gas filter, a 3-second DPF flue gas filter, a 4-flue gas confluence device, a 5-vortex booster pump, a 6-spray washing tower, a 7-circulating water pump and an 8-smoke outlet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Example 1

As shown in fig. 1, the device for purifying and treating the tail gas of the diesel engine comprises a flue gas filter DPF and a spray washing tower, wherein the flue gas filter DPF is communicated with the spray washing tower, and the tail gas of the diesel engine is purified by the flue gas filter DPF and the spray washing tower in sequence and then is exhausted.

The quantity of the shown flue gas filter DPF is two, and the two flue gas filter DPF is fixed on the upper and lower supports in the cabinet body through the hoop respectively, the diesel engine tail gas purification treatment device further comprises a flue gas splitter and a flue gas collector, the flue gas splitter is installed at the front ends of the two parallel flue gas filters DPF, the flue gas collector is installed at the rear ends of the two parallel flue gas filters DPF, and the flue gas collector is communicated with the spray washing tower.

The tail gas of the diesel engine is firstly purified by DPF to filter out 95% of black smoke, and the residual irritant gases such as NOx enter a washing tower for washing and filtering. In order to avoid the influence of the DPF on the performance of the diesel engine and to realize continuous operation of the DPF, PM (fine particulate matter) accumulated during trapping in the DPF must be removed in time, the gradual increase of the particulate matter in the filter causes the increase of engine back pressure, so that the performance of the engine is reduced, and the process of removing the PM accumulated in the DPF is called DPF regeneration to recover the filtering performance of the DPF. In the embodiment, a passive regeneration mode is adopted, and when the backpressure value reaches a set value, the filter element is disassembled and is subjected to back flushing regeneration by using compressed air.

The flue gas confluence device is communicated with the spray washing tower through a connecting pipe, and the connecting pipe is connected with a vortex booster pump. The vortex booster pump controls the start and stop of the cabinet body through an electric cabinet on the front side of the cabinet body. The vortex booster pump is used for increasing the pressure of gas entering the spray tower.

The spraying and washing tower is of a multi-layer spraying structure, the diameter of the spraying and washing tower is 800mm, the height of the spraying and washing tower is 1200mm, three spraying layers are distributed in the spraying and washing tower from top to bottom, a grid plate is arranged above each spraying layer, a ceramic pall ring packing layer is arranged on each grid plate, the spraying and washing tower conveys absorption liquid to the top of the spraying and washing tower through a circulating water pump, waste gas entering from the bottom of the spraying and washing tower is sprayed and purified through a spray head, in the embodiment, the absorption liquid is urea solution, the urea solution absorbs reaction nitrogen oxides, and pollution-free nitrogen and water vapor are generated and discharged.

A bent smoke outlet is arranged above the cabinet body of the diesel engine tail gas purification treatment device and communicated with the top end of the spraying washing tower and used for discharging purified tail gas.

Example 2

The flue gas confluence device is communicated with the spray washing tower through a connecting pipe, and the connecting pipe is connected with a vortex booster pump. The vortex booster pump controls the start and stop of the cabinet body through an electric cabinet on the front side of the cabinet body.

The spraying and washing tower is of a multi-layer spraying structure, the diameter of the spraying and washing tower is 900mm, the height of the spraying and washing tower is 1500mm, four spraying layers are distributed in the spraying and washing tower from top to bottom, a grid plate is arranged above each spraying layer, a PP polypropylene plastic packing layer is arranged on each grid plate, the spraying and washing tower conveys absorption liquid to the top of the spraying and washing tower through a circulating water pump, waste gas entering from the bottom of the spraying and washing tower is sprayed and purified through a spray head, and the absorption liquid in the embodiment is urea solution.

Claims

1. The utility model provides a spray and absorb diesel engine tail gas clean-up processing apparatus which characterized in that: the diesel engine tail gas purification device comprises a flue gas filter DPF and a spray washing tower, wherein the flue gas filter DPF is communicated with the spray washing tower, and the diesel engine tail gas is purified by the flue gas filter DPF and the spray washing tower in sequence and then is exhausted.

2. The diesel engine exhaust gas purification processing apparatus according to claim 1, characterized in that: the device also comprises a vortex booster pump, wherein the vortex booster pump is used for increasing the air inlet pressure of the tail gas of the diesel engine through the spray washing tower.

3. The diesel engine exhaust gas purification processing device according to claim 1 or 2, characterized in that: the number of the DPF of the smoke filter is one or more than one and is used in parallel.

4. The diesel engine exhaust gas purification processing apparatus according to claim 3, characterized in that: when the quantity of flue gas filter DPF was a plurality of parallelly connected uses, still include flue gas shunt and flue gas ware that converges, the flue gas shunt is installed in a plurality of parallelly connected flue gas filter DPF front ends, the flue gas ware that converges is installed in a plurality of parallelly connected flue gas filter DPF rear ends, the flue gas ware that converges communicates with the spray scrubbing tower.

5. The diesel engine exhaust gas purification processing apparatus according to claim 4, characterized in that: the number of the DPF of the flue gas filter is two and is used in parallel.

6. The diesel engine exhaust gas purification processing apparatus according to claim 5, characterized in that: the flue gas converging device is communicated with the spray washing tower through a connecting pipe, and the connecting pipe is connected with the vortex booster pump.

7. The diesel engine exhaust gas purification processing apparatus according to claim 5, characterized in that: the spraying washing tower is of a multi-layer spraying structure.

8. The diesel engine exhaust gas purification processing apparatus according to claim 4, 5, 6, or 7, characterized in that: still include the cabinet body, flue gas shunt, flue gas filter DPF, flue gas converge ware, swirl booster pump, circulating water pump, spray the scrubbing tower and all install in the cabinet internally.

9. The diesel engine exhaust gas purification processing apparatus according to claim 8, characterized in that: a bent smoke outlet is arranged above the cabinet body and communicated with the top end of the spraying washing tower.

10. The diesel engine exhaust gas purification processing apparatus according to claim 8, wherein: the front surface of the cabinet body is provided with a water pump pressure control screen, and the control screen is electrically connected with the vortex booster pump and the circulating water pump.