阅读说明：本技术 一种内燃机车尾气二次燃烧净化系统 (Diesel locomotive tail gas secondary combustion clean system ) 是由 宋泽峰 代佳宁 马胜元 陈佳临 侯永林 黄丘陵 朱凤猛 马震宇 于 2021-10-19 设计创作，主要内容包括：本发明涉及一种内燃机车尾气二次燃烧净化系统,包括尾气净化模块,所述的尾气净化模块与柴油机尾气的排放管路连接；所述的尾气净化模块包括柴油燃烧器和燃烧腔室,柴油机尾气在燃烧腔室通过柴油燃烧器进行二次燃烧；所述的燃烧腔室的输出端连接催化剂室,所述的催化剂室内设置有柴油机氧化催化器和柴油颗粒过滤器,所述的催化剂室的输出端设置有排烟口；二次燃烧后的气体通过柴油机氧化催化器以及柴油颗粒过滤器后由排烟口排出。本发明通过增加柴油燃烧器的方式,对内燃机车尾气进行二次燃烧以达到净化,使得过滤效率可以达到85％以上,排烟黑度值达到小于林格曼黑度1级,并且满足国家对环保排放的要求。(The invention relates to a secondary combustion purification system for tail gas of an internal combustion locomotive, which comprises a tail gas purification module, wherein the tail gas purification module is connected with a tail gas discharge pipeline of a diesel engine; the tail gas purification module comprises a diesel combustor and a combustion chamber, and the diesel tail gas is subjected to secondary combustion in the combustion chamber through the diesel combustor; the output end of the combustion chamber is connected with a catalyst chamber, a diesel oxidation catalyst and a diesel particle filter are arranged in the catalyst chamber, and the output end of the catalyst chamber is provided with a smoke outlet; and the gas after secondary combustion passes through the diesel oxidation catalyst and the diesel particle filter and is discharged from a smoke outlet. The invention carries out secondary combustion on the tail gas of the internal combustion locomotive to achieve purification by adding the diesel oil burner, so that the filtering efficiency can reach more than 85 percent, the smoke blackness value reaches less than 1 grade of Ringelmann blackness, and the national requirement on environmental protection emission is met.)

1. A secondary combustion purification system for tail gas of an internal combustion locomotive comprises a tail gas purification module, wherein the tail gas purification module is connected with a tail gas discharge pipeline of a diesel engine; the tail gas purification module comprises a diesel combustor and a combustion chamber, and the diesel tail gas is subjected to secondary combustion in the combustion chamber through the diesel combustor; the output end of the combustion chamber is connected with a catalyst chamber, a diesel oxidation catalyst and a diesel particle filter are arranged in the catalyst chamber, and the output end of the catalyst chamber is provided with a smoke outlet; and the gas after secondary combustion passes through the diesel oxidation catalyst and the diesel particle filter and is discharged from a smoke outlet.

2. The diesel locomotive tail gas secondary combustion purification system of claim 1, wherein: the diesel burner comprises an electromagnetic valve, an ignition device and a monitoring device; the diesel burner is respectively connected with an oil supply pump and an air supply fan through pipelines.

3. The diesel locomotive tail gas secondary combustion purification system of claim 2, wherein: the oil supply oil pump and the air supply fan respectively supply fuel and combustion-supporting air.

4. The diesel locomotive tail gas secondary combustion purification system of claim 2, wherein: the electromagnetic valve performs automatic on-off control of the oil way.

5. The diesel locomotive tail gas secondary combustion purification system of claim 2, wherein: the ignition device is an ignition transformer and performs automatic ignition control.

6. The diesel locomotive tail gas secondary combustion purification system of claim 2, wherein: the monitoring device is a fire detector and a pressure transmitter for detecting flame and monitoring pressure.

7. The diesel locomotive tail gas secondary combustion purification system of claim 1, wherein: the electric control cabinet receives external signals through the PLC.

8. The diesel locomotive tail gas secondary combustion purification system of claim 1, wherein: the diesel combustor is characterized by further comprising a waterproof cover, wherein the waterproof cover is arranged at the front end of the diesel combustor.

9. The diesel locomotive tail gas secondary combustion purification system of claim 1, wherein: the tail gas purification device is characterized by further comprising a support frame, wherein the support frame is arranged at the bottom of the tail gas purification module.

Technical Field

The invention relates to the technical field of diesel locomotives, in particular to a secondary combustion purification system for diesel locomotive tail gas.

Background

With the national emphasis on environmental emission, the emission of locomotives, fixed sources, non-roads and the like is in the environmental-protection spot check range, the emission index of the traction diesel locomotive used by various domestic iron and steel enterprises generally can only reach the national II standard, and the traction diesel locomotive has serious black smoke emission phenomenon and cannot meet the national requirement on environmental protection.

In addition, the exhaust emission of the existing diesel locomotive has the following problems: 1. the filter element is easy to block due to the phenomenon of engine oil channeling, so that the problems of unsmooth smoke discharge and back pressure increase can be caused in a short time, and the DOC + DPF cannot really play a role; 2. when the diesel engine is started, the smoke exhaust problem cannot quickly reach the DOC and DPF working temperature, so that the filter element maintenance period is shortened; 3. a large amount of carbon particles exist in the tail gas, the DOC and DPF have large filtering burden, a large amount of filter elements are required to be used to improve the filtering quality, and the maintenance period of the filter elements is correspondingly shortened; 4. most of the time, the temperature does not reach the optimal working temperature, and the catalyst cannot really play a role; 5. the engine oil load and the carbon particle load are combined, the maintenance period is short, and the maintenance is needed once in 1-2 days when the state is poor.

Although the technology of the tail gas purification device for the road is mature, the technology has no application precedent in the field of internal combustion locomotives, and through verification, due to the use environment, the working condition and the characteristics of the internal combustion locomotives, the original tail gas purification device for the road is not suitable for the field, and a new purification system suitable for solving the problem of tail gas pollution emission of the internal combustion locomotives needs to be developed, so that the tail gas emission of the internal combustion locomotive reaches the III-stage standard of non-road mobile machinery emission (GB 20891-2014).

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the diesel locomotive tail gas secondary combustion purification system is provided to solve the problems that engine oil contained in the discharged smoke and the temperature of the discharged smoke cannot reach the working temperature of DOC and DPF due to the fact that engine oil is mixed in a diesel engine of a locomotive.

The technical scheme adopted by the invention for solving the technical problems is as follows: a secondary combustion purification system for tail gas of an internal combustion locomotive comprises a tail gas purification module, wherein the tail gas purification module is connected with a tail gas discharge pipeline of a diesel engine; the tail gas purification module comprises a diesel combustor and a combustion chamber, and the diesel tail gas is subjected to secondary combustion in the combustion chamber through the diesel combustor; the output end of the combustion chamber is connected with a catalyst chamber, a diesel oxidation catalyst and a diesel particle filter are arranged in the catalyst chamber, and the output end of the catalyst chamber is provided with a smoke outlet; and the gas after secondary combustion passes through the diesel oxidation catalyst and the diesel particle filter and is discharged from a smoke outlet.

Furthermore, the diesel burner comprises an electromagnetic valve, an ignition device and a monitoring device; the diesel burner is connected with the oil supply pump and the air supply fan.

Furthermore, the oil supply pump and the air supply fan respectively supply fuel and combustion-supporting air.

Furthermore, the electromagnetic valve provided by the invention can be used for automatically controlling the on-off of an oil way.

Furthermore, the ignition device is an ignition transformer and performs automatic ignition control.

Furthermore, the monitoring device is a fire detector and a pressure transmitter for detecting flame and monitoring pressure.

The invention further comprises an electric control system, wherein the electric control system consists of an electric control cabinet and a control panel, and the electric control cabinet receives external signals through the PLC.

Furthermore, the diesel combustor also comprises a waterproof cover, and the waterproof cover is arranged at the front end of the diesel combustor.

Furthermore, the invention also comprises a support frame which is arranged at the bottom of the tail gas purification module.

The invention has the advantages that the defects in the background technology are overcome, the tail gas of the internal combustion locomotive is subjected to secondary combustion to achieve purification by adding the diesel burner, the filtering efficiency can reach more than 85 percent, the smoke discharge blackness value reaches less than the Ringelmann blackness level 1, and the national requirements on environmental protection emission are met.

Drawings

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

Fig. 2 is a schematic structural view of an exhaust gas purifying module according to the present invention.

In the figure: 1. a tail gas purification module; 2. an oil supply pump; 3. an air supply fan; 4. an electronic control system; 11. a diesel burner; 12. a combustion chamber; 13. a catalyst chamber; 14. a smoke outlet; 15. a waterproof cover; 16. a support frame.

Detailed Description

The invention will now be described in further detail with reference to the drawings and preferred embodiments. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

The secondary combustion purification system for the tail gas of the diesel locomotive shown in fig. 1-2 comprises a tail gas purification module 1, wherein the tail gas purification module 1 is connected with a tail gas discharge pipeline of a diesel engine; the tail gas purification module comprises a diesel combustor 11 and a combustion chamber 12, and the diesel tail gas is subjected to secondary combustion in the combustion chamber 12 through the diesel combustor 11; the output end of the combustion chamber 12 is connected with a catalyst chamber 13, a diesel oxidation catalyst and a diesel particle filter are arranged in the catalyst chamber 13, and the output end of the catalyst chamber is provided with a smoke outlet 14; the gas after the secondary combustion passes through the diesel oxidation catalyst and the diesel particulate filter and is discharged from the smoke outlet 14. The waterproof cover 15 is arranged at the front end of the diesel burner. The support frame 16 is arranged at the bottom of the tail gas purification module.

The diesel burner comprises an electromagnetic valve, an ignition device and a monitoring device; the diesel oil burner is connected with an oil supply pump 2 and an air supply fan 3. The oil pump and the fan provide fuel and combustion-supporting air, and the electromagnetic valve realizes automatic on-off control of an oil way. The ignition device is mainly an ignition transformer to realize automatic ignition control, and the monitoring device is mainly a fire detector and a pressure transmitter to realize flame detection and pressure monitoring and ensure that the equipment can operate more safely and effectively. The electric control system 4 consists of an electric control cabinet and a control panel cabinet, wherein the electric control cabinet and a main control unit receive external signals through a Siemens PLC, a controller is responsible for ignition time sequence control, and the PLC and the controller jointly control external equipment to realize time sequence control, load regulation and alarm reaction of the equipment.

In the tail gas treatment process, a tail gas purification module is additionally arranged between devices of a tail gas outlet of a diesel engine, a diesel oil burner in the tail gas purification module raises the temperature of the tail gas of the diesel engine to 350-400 ℃, engine oil mixed in the tail gas is vaporized, and most of the engine oil is burnt; meanwhile, carrying out secondary combustion on the large carbon particles, and burning most of the large carbon particles; the burnt exhaust gas enters the DOC, the working temperature is about 380 ℃, and HC, CO in the exhaust gas and soluble organic matters (SOF) in the particulate matters are oxidized into CO2 and water under the action of the DOC catalyst.

The diesel oil burner is adopted because the diesel engines (new and old) of internal combustion locomotives in steel mills and mining conditions have the phenomenon of light or heavy oil leakage, the open flash point of the oil is generally between 200 and 240 ℃, the ignition point is about 30 ℃ higher, namely the ignition point of the oil is between 230 and 270 ℃, but no open fire is ignited, and the oil cannot burn. For this reason, a diesel combustion engine with open flame combustion is used instead of the electric heating method. In addition, the exhaust temperatures of locomotive diesel engines are low, with the exhaust to roof temperatures of approximately 200 ℃, which are insufficient to support the operating temperatures of the DOC and DPF.

The diesel combustor can solve the following problems: (1) the engine oil in the tail gas is in a liquid drop shape, the liquid drops can adsorb Particulate Matters (PM) to form viscous large particle groups, and the particle groups can be adhered to the surface of the DOC to inactivate the DOC; the particulate masses that have entered the DPF adhere to the DPF wall surface, deactivating the DPF, quickly blocking the DPF, and causing a rapid rise in exhaust back pressure. In fact, it can cause the entire aftertreatment device to quickly become non-functional; (2) the above results will cause the DOC and the DPF to need frequent maintenance, and the DOC and the DPF have to be disassembled to regenerate the DOC and the DPF in an off-line regeneration mode; (3) frequent disassembly and maintenance workload is very large, and the service life of the DOC, the DPF and even the whole aftertreatment equipment is also influenced; (4) most of carbon particles are burnt to prevent the large particles from being blocked; (5) the exhaust temperature is not sufficient to support the operating temperatures of the DOC and DPF.

The diesel combustor raises the temperature of the tail gas of the diesel engine to 350-400 ℃, and engine oil mixed in the tail gas is vaporized and mostly burnt; the exhaust gas enters the DOC, the working temperature is about 380 ℃, and HC, CO in the exhaust gas and soluble organic matters (SOF) in the particles are oxidized into CO2 and water under the action of the DOC catalyst.

The mode that adopts diesel burner and DOC and DPF to combine has following advantage:

1. the engine oil taken out can be ignited, burned and gasified. The problem that the engine oil blocks the filter element is solved.

2. After the combustor is ignited, the temperature is raised instantly, and the problem of a cold machine can be solved. When the diesel engine starts, the problem of discharging fume can not reach DOC and DPF operating temperature fast, leads to the filter core maintenance cycle to shorten. This problem can be solved by adding a burner.

3. The combustor can burn most of carbon particles in tail gas in the combustion chamber, and the filtering burden of the filter element is reduced.

4. After the combustor is adopted, the DOC and the DPF can reach the optimal working temperature, and the filtering efficiency can reach the optimal state.

5. After the burner is adopted, the maintenance period of the filter element is prolonged, and the maintenance once for several months can be realized.

While particular embodiments of the present invention have been described in the foregoing specification, various modifications and alterations to the previously described embodiments will become apparent to those skilled in the art from this description without departing from the spirit and scope of the invention.