CN109157969B - Water treatment system for EGR of marine low-speed diesel engine - Google Patents
Water treatment system for EGR of marine low-speed diesel engine Download PDFInfo
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- CN109157969B CN109157969B CN201811264376.8A CN201811264376A CN109157969B CN 109157969 B CN109157969 B CN 109157969B CN 201811264376 A CN201811264376 A CN 201811264376A CN 109157969 B CN109157969 B CN 109157969B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
- F02M26/35—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/30—Alkali metal compounds
- B01D2251/304—Alkali metal compounds of sodium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
A water treatment system for EGR of a marine low-speed diesel engine comprises a circulating water buffer tank for providing circulating water for the EGR, a NaOH solution tank for providing NaOH solution for the EGR and a control system for automatically controlling the treatment, supply, discharge, heating and detection of the circulating water and the NaOH solution; the circulating water buffer tank is connected with the EGR, and has the functions of liquid level alarm, liquid level automatic control, circulating water automatic supply, extremely high liquid level overflow, forced discharge and automatic monitoring and control of water turbidity; the NaOH solution tank is connected with the EGR, and has the functions of liquid level alarming, liquid level automatic control, automatic filling supplement and temperature automatic control; the control system is connected with and controls the circulating water buffer tank to realize automatic supply, liquid level alarm and automatic control of circulating water and monitoring and automatic control of water turbidity, and the NaOH solution tank is connected with and controlled to realize automatic filling and supplement, liquid level alarm and automatic control of NaOH solution and monitoring and automatic control of temperature. The invention solves the problem of supplying EGR circulating water and NaOH solution, and has the advantages of compact structure, high control precision and automatic operation.
Description
Technical Field
The invention relates to a marine low-speed diesel engine, in particular to a water treatment system for EGR of the marine low-speed diesel engine, and belongs to the technical field of diesel engines.
Background
With the increasing strictness of environmental requirements, according to the Tier III specification of the International maritime organization, when a ship built after 1 month and 1 day of 2016 runs in a nitrogen oxide emission control area (NOx-ECAs), the emission period value of nitrogen oxides is required to be lower than 3.4g/kwh for a main engine with the rotating speed lower than 130rpm, and the emission value at each load point is required to be not higher than 5.1 g/kwh. That is, the nitrogen oxide emissions of Tier III were reduced by 76% relative to Tier II. The conventional ME type host can only meet the emission specification of Tier II but can not meet the requirement of the Tier III specification. Thus, existing conventional hosts must be technically improved to meet the requirements of the Tier III specification. In order to meet the requirements of the Tier III specification, the conventional host mainly adopts two technical schemes: one is the use of Exhaust Gas Recirculation (EGR) systems and the other is the use of Selective Catalytic Reduction (SCR) systems. A selective catalytic reduction system, SCR for short, is an exhaust gas post-treatment technology that uses urea solution to treat nitrogen oxides in the exhaust gas. The system is bulky, installation difficulty is high for a cabin with narrow and limited space, and running cost is high. An exhaust gas recirculation system, referred to as EGR for short, reintroduces a certain amount of exhaust gas into a scavenging system of a main engine, replaces oxygen in scavenging gas with carbon dioxide in the circulating exhaust gas, and reduces the combustion speed through the replacement, thereby reducing the peak temperature of combustion, and simultaneously, the combustion temperature is reduced because carbon dioxide has higher specific heat capacity relative to oxygen; lower combustion temperatures, particularly lower peak combustion temperatures, can reduce the generation of NOx emissions. EGR is integrated on the main engine, namely is integrated with the main engine structure, so that the requirement on cabin space is low, the operation cost is relatively low, and the EGR is a preferred technical scheme of the main engine meeting the requirements of the Tier III technical specification.
The water treatment system of the EGR is one of the main core components of the EGR system. Because the exhaust gas of the main engine enters the cylinder again to circulate and participate in combustion, and the exhaust gas contains pickling gas, carbon deposit and other impurities, in order to prevent sulfide and solid particles in the recycled exhaust gas from damaging the main engine, the exhaust gas needs to be cleaned and treated, and the water treatment system of the EGR realizes the cleaning of the exhaust gas by supplying the continuously recycled washing water to the EGR unit. Because the circulating water is turbid, has certain acidity or alkalinity and contains particle impurities, the circulating water also needs to be subjected to water quality treatment. The wastewater treatment system must be able to ensure removal of accumulated solid particles and neutralized sulfides in the circulating water and ensure that the water supply rate and pressure are able to provide sufficient wash water to the EGR unit. In addition, the space characteristics of the cabin are considered, the wastewater treatment system is compact as much as possible, and reasonable arrangement of the host and the parts of the wastewater treatment system is required to be considered by combining the condition of limited workshop space, so that the wastewater treatment system is compact in structure and modular in unit, and can be conveniently arranged in the compact and limited space. Because the EGR system also needs to supply NaOH solution to neutralize the acid gas generated by the main machine, the water treatment system of the EGR system also needs to supply the required usage amount of alkali liquor, and because the NaOH solution belongs to dangerous chemicals, the system also needs to have the functions of automatically filling and discharging the NaOH solution, thereby reducing the human participation, reducing the operation risk and improving the labor efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the existing EGR water treatment system, provides the water treatment system for the EGR of the marine low-speed diesel engine, solves the problems of supply, storage, monitoring and treatment of circulating water and NaOH solution of an EGR unit during driving, adopts intelligent logic control, and achieves the effects of compact structure, improved control precision and automatic operation.
The technical scheme of the invention is as follows:
a water treatment system for EGR of a marine low-speed diesel engine is connected to an EGR unit, the water treatment system is in a prying design, integrates a mechanical prying block and a control system, and comprises a circulating water buffer tank, a NaOH solution tank and the control system;
the circulating water buffer tank is connected with the EGR and provides circulating water for the EGR, and has the functions of liquid level alarming, liquid level automatic control, circulating water automatic supply, extremely high liquid level overflow, forced discharge and automatic monitoring and control of water quality turbidity;
the NaOH solution tank is connected with the EGR and provides NaOH solution for the EGR, the system has the functions of liquid level alarm, automatic liquid level control, automatic filling and supplementing and automatic temperature control, and is provided with an input port and an output port;
the control system is respectively connected with the circulating water buffer tank and the NaOH solution tank and comprises two local control devices and a remote control device, the two local control devices are respectively installed on the circulating water buffer tank and the NaOH solution tank, and the remote control device is arranged in a remote centralized control room and is connected and communicated with the local control devices by using a network cable;
the control system controls the circulating water buffer tank to complete the supply, treatment and monitoring of the circulating water of the EGR, and realizes the automatic supply, liquid level alarm and automatic control of the circulating water and the monitoring and automatic control of the water turbidity; the control system controls the NaOH solution tank to complete supply, heating and monitoring of the EGR NaOH solution, and realizes automatic filling and supplementing, liquid level alarming and automatic control of the NaOH solution, and monitoring and automatic control of temperature.
As a further improvement, the circulating water buffer tank comprises a buffer tank body, an in-situ control box, a forced discharge pump, a magnetic flap type liquid level meter, a signal converter, a turbidity sensor and a frame;
the buffer tank body is used for containing circulating water, is respectively connected with the EGR through a water outlet and a water return port of the circulating water buffer tank, and is connected with a sewage tank through a water discharge port of the circulating water buffer tank;
the forced discharge pump is used for forcibly discharging the circulating water in the buffer tank body, and is connected between the buffer tank body and a water discharge opening of the circulating water buffer tank to form a forced discharge pipeline system;
the magnetic turning plate type liquid level meter is connected to the buffer tank body and used for displaying the liquid level on site and outputting 4-20mA current for remotely displaying the liquid level;
the turbidity sensor is arranged at the top of the buffer tank body and used for monitoring the water quality of the circulating water, and the signal converter is connected with the turbidity sensor and outputs a 4-20mA current signal for the control system to use;
the local control box is connected with the control system and used for integrally controlling the circulating water buffer tank to provide circulating water for the EGR in a manual/automatic control mode, the local control box is connected with the forced discharge pump to realize forced discharge of the circulating water, the magnetic flap type liquid level meter is connected to realize automatic supply of the circulating water, alarm and automatic control of the liquid level, and the signal converter and the turbidity sensor are connected to realize automatic monitoring and control of the water quality turbidity of the circulating water;
the buffer tank body, the local control box, the forced discharge pump, the magnetic turning plate type liquid level meter, the signal converter and the turbidity sensor are integrally installed on the frame.
As a further improvement, the effective volume of the buffer tank body is 2m3The material is 316L stainless steel.
As a further improvement, the turbidity sensors are provided with a plurality of sensors which are mutually standby and mutually verified.
As a further improvement, the NaOH solution tank comprises a NaOH solution tank body, an on-site control box, a filling pump, a magnetic turning plate type liquid level meter, a floating ball type liquid level controller, an electric heater and a frame;
the NaOH solution tank body is used for containing NaOH solution, is connected with the EGR through an output port of the NaOH solution tank, and is connected with a NaOH supply box through an input port of the NaOH solution tank;
the filling pump has a dual filling/discharging function and is used for filling/discharging NaOH solution in the NaOH solution tank body, an input port of the NaOH solution tank is connected to the upper part of the NaOH solution tank body through the filling pump to form a filling passage, and the bottom of the NaOH solution tank body is connected to the input port of the NaOH solution tank through the filling pump to form a discharging passage;
the magnetic turning plate type liquid level meter is connected to the NaOH solution tank body and used for displaying the liquid level on site and outputting 4-20mA current for remotely displaying the liquid level;
the floating ball liquid level controller is arranged on the NaOH solution tank body and is used for monitoring and alarming liquid level;
the electric heater is arranged on the NaOH solution tank body and used for heating the NaOH solution in the NaOH solution tank body so as to maintain the temperature of the NaOH solution;
the local control box is connected with the control system and used for integrally controlling the NaOH solution tank to provide NaOH solution for the EGR in a manual/automatic control mode, the local control box is connected with the filling pump to realize automatic filling of the NaOH solution, the magnetic flap type liquid level meter is connected to realize automatic replenishment of the NaOH solution, the floating ball liquid level controller is connected to realize alarming and automatic control of the liquid level of the NaOH solution, and the electric heater is connected to realize monitoring, heating and automatic control of the temperature of the NaOH solution;
the NaOH solution tank, the local control box, the filling pump, the magnetic turning plate type liquid level meter, the floating ball liquid level controller and the electric heater are integrally installed on the frame.
As a further improvement, the effective volume of the NaOH solution tank body is 1m3The material is 316L stainless steel.
As a further improvement, two electric heaters are arranged, and the two electric heaters are diagonally arranged on the NaOH solution tank body.
The safety and convenience of the water treatment system for the EGR of the marine low-speed diesel engine are realized by the following points:
the water treatment system is in a prying design, integrates a mechanical prying block and a local control system, and is compact in structure, small in occupied space, light in weight and convenient to hoist, transport and carry;
the water treatment system has perfect functions, can be applied to EGR units of different hosts, can be completely applicable by adding the same system aiming at the EGR unit of the ultra-large host, can be used only by supplying power and connecting external pipes after the equipment is moved if the test bed is changed, does not need to be debugged, and has strong adaptability;
industrial tap water is connected outside the circulating water buffer tank, circulating water is supplied by using the water pressure of the industrial tap water, the circulating water level is controlled, a water pump is not needed for pumping water for supply, the water level supply is controlled by a liquid level sensor and a liquid level meter, the liquid level is ensured to be at the normal level, and an EGR (exhaust gas recirculation) host motor vehicle is ensured;
fourthly, the circulating water buffer tank is provided with a turbidity sensor, the circulating water buffer tank has a water quality monitoring function, if the turbidity of the circulating water is higher than a set value, the water treatment function is started, clean industrial tap water is supplied, the turbid circulating water in the tank is discharged, the water treatment function control belongs to automatic control, manual participation is not needed, and the operation workload is reduced;
the NaOH solution tank is used as a storage device of the NaOH solution, and can heat the NaOH solution in the NaOH solution tank and maintain the temperature of the NaOH solution in the tank body; automatically controlling the filling of the solution and controlling the liquid level of the solution in the tank; the filling pump has the functions of filling and forced discharging;
the water treatment system has high degree of automation, reduces manual intervention operation, can be automatically adjusted according to a set value, and the remote control system can directly input the set value to the PLC module, so that the PLC module controls the operation of various devices, and the normal operation of the EGR unit is ensured.
Compared with the prior art, the invention has the following technical effects:
1) the invention solves the problem of the requirement of the EGR unit on circulating water during the motor car, and can meet the requirement of the EGR host machine on the motor car.
2) The circulating water of the EGR unit presents different degrees of pH value and turbidity in the motor train process, and the invention solves the problem by a dilution scheme without independently purchasing a set of special water quality treatment equipment.
3) The invention solves the problem of the demand of the EGR unit on NaOH solution during the driving, and can control the heater to maintain the supply temperature of the NaOH solution.
4) The water treatment system is of a prying design, the prying block is small in size, and the field space of a workshop is effectively saved.
5) The invention has high automation degree, reduces manual intervention operation, adopts intelligent logic control, reduces the workload of operators and improves the control precision.
6) The invention has a remote control system, integrates the action control of various valves and pump sets, and comprises manual/automatic control.
Drawings
Fig. 1 is a schematic diagram of the present invention.
Fig. 2 is one of the three-dimensional structures of the circulating water buffer tank.
Fig. 3 is a second perspective view of the circulating water buffer tank.
FIG. 4 is one of the three-dimensional structures of the NaOH solution tank.
FIG. 5 is a second perspective view of the NaOH solution tank.
In the figure: 1-circulating water buffer tank, 2-NaOH solution tank, 3-control system, 4-sewage tank, 5-NaOH supply tank, 11-buffer tank body, 12-local control tank, 13-forced discharge pump, 14-magnetic flap level gauge, 15-signal converter, 16-turbidity sensor, 17-frame, 21-NaOH solution tank, 22-local control tank, 23-filling pump, 24-magnetic flap level gauge, 25-floating ball level controller, 26-electric heater, 27-frame, A-manual water-filling valve, B-electric water-filling valve, C-manual water-returning valve, D-manual overflow valve, E-electric discharge valve, H-manual supply valve, V1-manual valve, V2-manual valve, V3-manual discharge valve, V4-electric inlet valve, V5-discharge port manual valve, V6-manual main output valve, V7-electric filling valve.
Detailed Description
The following detailed description of the water treatment system for EGR of marine low speed diesel engine according to the present invention will be made with reference to the accompanying drawings and specific embodiments, but the scope of the invention is not limited thereby.
The invention consists of three major parts: a set of circulating water buffer tank for supplying, treating and monitoring circulating water; a set of NaOH solution tanks for storing, heating and supplying NaOH solution; the integrated control system has both local control and remote control functions and is used for automatically controlling the treatment, supply, discharge, heating, detection and the like of circulating water and NaOH solution.
Referring to fig. 1, the whole water treatment system for EGR of a marine low-speed diesel engine includes a circulating water buffer tank 1, a NaOH solution tank 2, and a control system 3.
The circulating water buffer tank 1 is used for containing and treating circulating water of the EGR unit, and has the functions of automatic circulating water supply, automatic liquid level control, high liquid level, low liquid level and extremely low liquid level alarm, extremely high liquid level overflow, water quality turbidity monitoring, forced discharge and the like. The water outlet of the circulating water buffer tank 1 is connected with the SU unit of the host through a chemical hose, the outlet of the SU is connected with the WI interface of the EGR, the circulating water for cleaning the EGR is provided for the diesel engine, the water return port of the circulating water buffer tank 1 is connected with the external port WO interface of the EGR of the diesel engine, the water return of the EGR unit is introduced into the circulating water buffer tank 1, the water drain port of the circulating water buffer tank 1 is connected to a sewage tank 4 through the chemical hose, the discharged wastewater is collected, and then the wastewater is treated in a centralized manner.
The NaOH solution tank 2 is used for containing externally supplied NaOH solution into the tank body for storage, and has the functions of automatically controlling the liquid level, automatically starting a filling pump when the liquid level is low to supplement the NaOH solution, alarming the high liquid level and the low liquid level and the like. The output port of the NaOH solution tank 2 is connected with an SU unit, and then the NaOH solution is conveyed to a host by a metering pump of the SU; an input port of the NaOH solution tank 2 is connected to the NaOH supply tank 5, and a filling pump 23 is used to fill the NaOH solution into the NaOH solution tank 2.
The control system 3 is divided into two sets of devices of local control and remote control. A set of local control device is respectively integrated with the circulating water buffer tank 1 and the NaOH solution tank 2, and is used for integrally controlling various valve elements and pump groups to act, including manual/automatic control; the other remote control device is arranged in a remote centralized control room and is connected and communicated with the local control device by using a network cable, so that various information of a remote tank body can be displayed, the actions of various electromagnetic valve pieces can be controlled, the control of a host vehicle operator is facilitated, and the remote control device has the function of alarming and monitoring; the remote control device integrates elements such as a PLC module, a touch screen, a controller and the like.
Referring to fig. 2 and fig. 3 in combination, the circulating water buffer tank 1 includes 7 parts: a buffer tank 11, a local control box 12, a forced drainage pump 13, a magnetic flap level gauge 14, a signal converter 15, a turbidity sensor 16 and a frame 17.
The buffer tank body 11 is used for containing circulating water and has an effective volume of 2m3Since the circulating water is acidic or alkaline, the material of the buffer tank 11 is 316L stainless steel. The tank body is provided with various sensors, pumps, pipe fittings and valve members, a main output pipeline of the buffer tank body 11 is connected with a manual supply valve H, as shown in figure 1, and the manual supply valve H is connected with a water outlet of the circulating water buffer tank 1; the water return pipeline of the buffer tank body 11 is connected with a manual water return valve C which is used for manual operationThe water return valve C is connected with a water return port of the circulating water buffer tank 1; an automatic discharge pipe of the buffer tank body 11 is connected with an electric discharge valve E, and the electric discharge valve E is connected with the local control box 12 and is controlled by the control system 3; the outlets of the pipelines for forced discharge and automatic discharge are converged and connected to the sewage tank 4 through the water outlet of the circulating water buffer tank 1; the water replenishing and injecting pipes are connected in parallel with two paths and are respectively connected with a manual water replenishing valve A and an electric water replenishing valve B, and the back sides of the manual water replenishing valve A and the electric water replenishing valve B are connected with the buffer tank body 11; the top of the buffer tank body 11 is provided with an air inlet, a dosing port and a sensor.
The local control box 12 is used for integrated control of various valve elements and pump group actions, including manual/automatic control; the local control box 12 is connected to the control system 3 by a network cable and performs communication control, and the local control box 12 can control the turbidity of the circulating water in the buffer tank 11 by discharging or replenishing the circulating water.
The forced discharging pump 13 is used for forcibly discharging the circulating water in the buffer tank 11, a forced discharging pipe is connected to the upstream of the forced discharging pump 13 through a manual valve V1, the forced discharging pipe is connected to the buffer tank 11, and a discharge opening of the circulating water buffer tank 1 is connected to the downstream of the forced discharging pump 13 through a manual valve V2, thereby forming a forced discharging pipeline system.
The magnetic turning plate type liquid level meter 14 is connected to the buffer tank body 11 and used for mechanically displaying the liquid level and outputting 4-20mA current for remotely displaying the liquid level.
The turbidity sensor 16 is installed on the top of the buffer tank 11 and used for monitoring the quality of the circulating water, the signal converter 15 is connected with the turbidity sensor 16, and since the signal output by the turbidity sensor 16 cannot be directly used, the signal must be processed by the signal converter 15 and a 4-20mA current signal is output for the control system 3 to use. The turbidity sensors 16 are provided with 2 turbidity sensors which are mutually standby and mutually verified.
The frame 17 serves as a support for the entire buffer tank 11, the positive displacement pump 13, the piping and the local control box 12 part, and is placed on the ground while also having the function of collecting the displaced liquid.
Referring to fig. 4 and 5 in combination, the NaOH solution tank 2 includes 7 parts: the system comprises a NaOH solution tank 21, an on-site control box 22, a filling pump 23, a magnetic turning plate type liquid level meter 24, a floating ball type liquid level controller 25, an electric heater 26 and a frame 27.
The effective volume of the NaOH solution tank body 21 is 1m3The NaOH solution tank body 21 is made of 316L stainless steel as the concentration of NaOH is 50%, the highest PH value reaches 14, and the NaOH solution tank body is strong in corrosivity; an output pipe on the NaOH solution tank body 21 is connected with a manual main output valve V6, and further connected with an output port of the NaOH solution tank 2.
The local control box 22 is used for integrated control of various valve components and pump group actions, including manual/automatic control; the local control box 22 is connected to the control system 3 by a network cable and performs communication control.
The filling pump 23 has a dual function of filling/discharging, and is used for filling/discharging the NaOH solution in the NaOH solution tank 21. An input port of the NaOH solution tank 2 is connected with an electric inlet valve V4, the back of the electric inlet valve V4 is connected with the filling pump 23, one of two paths of an outlet of the filling pump 23 is connected with an electric filling valve V7, and the electric filling valve V7 is connected with the upper part of the NaOH solution tank body 21 and is a filling passage; the discharge pipe at the bottom of the NaOH solution tank 21 is connected with a manual discharge valve V3, the back of the manual discharge valve V3 is connected with the inlet of the filling pump 23, the other of the two paths of the outlet of the filling pump 23 is connected with a manual discharge valve V5, and the manual discharge valve V5 is connected with the input port of the NaOH solution tank 2, which is a discharge passage.
The magnetic turning plate type liquid level meter 24 is connected to the NaOH solution tank 21 and used for mechanically displaying the liquid level and outputting 4-20mA current for remotely displaying the liquid level.
The float ball liquid level controller 25 is installed on the NaOH solution tank body 21 and used for liquid level monitoring and alarming, and a liquid level sensor is installed on the NaOH solution tank body 21 along the vertical direction.
The two electric heaters 26 are arranged on the NaOH solution tank 21, are diagonally arranged on the NaOH solution tank 21, and are used for heating the NaOH solution in the NaOH solution tank 21 to maintain the temperature of the NaOH solution; and a temperature control sensor is arranged at the middle lower part of the NaOH solution tank body 21, and a thermometer is arranged at the same time to indicate the real-time temperature of the medium in the NaOH solution tank body 21 in real time.
The frame 27 serves as a support for the entire NaOH solution tank 21, filling pump 23, piping and local control box 22 section, is placed on the ground, and also has the function of collecting the drained liquid.
The invention is applied to an Exhaust Gas Recirculation (EGR) system of a marine low-speed diesel engine. And after the diesel engine main unit is assembled, the diesel engine rack motor car is subjected to running-in. At the moment, an auxiliary engine system of the diesel engine needs to be equipped with the vehicle, all the diesel oil system, the lubricating oil system, the high-temperature cooling water system, the low-temperature water cooling system, the starting air system, the control air system, the cylinder oil system and the natural gas supply system are required to be in a state of starting the vehicle, the control system on a main engine of the diesel engine is electrified, and the debugging is finished; meanwhile, the water treatment system also needs to be in a standby state, and is required to be capable of providing and treating circulating water for diesel motor vehicles at any time and providing NaOH solution.
Referring to fig. 1, the specific operation process of the present invention is as follows:
1. pipelines for connecting all equipment of the water treatment system are made of corrosion-resistant 316L stainless steel pipes or chemical hoses, and the pipelines are required to be reliably connected and cannot leak; completing the electrical preparation for connecting communication lines, network lines and the like.
2. The system is connected with a sewage tank 4 and a NaOH supply tank 5.
3. The equipment is electrified, a power supply for supporting the water treatment system is provided as required, a main power switch of the two-site control box is turned on, and the remote electric control box also supplies power.
4. The circulating water buffer tank 1 is electrified, the control system 3 operates, the manual overflow valve D is opened, the manual water replenishing valve A or the electric water replenishing valve B is opened, and industrial tap water is replenished into the buffer tank body 11; if the manual water replenishing valve A is opened, the liquid level needs to be monitored manually, the overflow of the liquid level due to overhigh liquid level is avoided, and if the electric water replenishing valve B is opened to supply water, the electric water replenishing valve B can be automatically closed when the liquid level of the equipment is high.
5. When the liquid level of the circulating water reaches a normal value, closing the manual water replenishing valve A and switching the electric water replenishing valve B to an automatic state; the electric discharge valve E is switched to an automatic state, and the manual return valve C and the manual supply valve H are opened.
6. After the NaOH solution tank 2 is connected with the NaOH supply container 5, the manual drain valve V3 and the manual drain valve V5 are closed, the electric filling valve V7 and the electric inlet valve V4 are switched to be in an open state, the filling pump 23 is manually opened, NaOH solution in the NaOH supply container 5 is pumped into the NaOH solution tank 21, and then the electric filling valve V7 and the electric inlet valve V4 are closed and switched to an automatic state.
7. Before the vehicle starts, the manual main output valve V6 is opened, and NaOH solution is supplied to the EGR unit.
8. When the main engine is in a motor car, along with the entering of smoke into an EGR unit, circulating water can be turbid after being washed, a turbidity sensor 16 of the water treatment system monitors the turbidity of solution in a buffer tank body 11, when the turbidity of the solution exceeds 930FNU, an electric water supplementing valve B and an electric discharge valve E are opened, clean industrial tap water is supplemented, turbid circulating water is discharged until the turbidity is reduced to below 700FNU, and then the electric water supplementing valve B and the electric discharge valve E are closed; the turbidity control value of the system can be adjusted and set according to actual conditions: the control system 3 signal uses two turbidity sensors 16 to gather data turbidity high as the standard, if two turbidity data error exceed 50%, the system reports to the police, then manual shielding, the system normal operating.
9. The percentage of the liquid level in the buffer tank body 11 is controlled to be 65-75%, the control system 3 opens the electric discharge valve E for discharging, and opens the electric water replenishing valve B for replenishing water so as to control the liquid level height; when the liquid level percentage is 50% of the low liquid level, the control system 3 automatically opens the electric water replenishing valve B, and when the liquid level percentage reaches 70%, the electric water replenishing valve B is triggered to automatically close.
10. The NaOH solution tank 2 is provided with an electric heater 26 and a temperature control sensor, and the temperature control set value is 20-30 ℃; the electric heater 26 is triggered to be started at 18 ℃, and the set value of the temperature controller in the electric heater 26 is not more than 65 ℃.
11. The NaOH solution tank 2 is provided with a liquid level switch to monitor the liquid level of the NaOH solution tank body 21, a high liquid level alarm is sent out when the liquid level is 100 percent, a low liquid level alarm is sent out when the liquid level is 8 percent, an extremely low liquid level alarm is sent out when the liquid level is 5 percent, and the alarm sound is different from the low liquid level alarm sound; when the low liquid level alarm or the liquid level count value is 8%, the electric inlet valve V4 and the electric filling valve V7 are automatically opened, the filling pump 23 is started to start filling liquid, and the liquid level is triggered to stop.
12. All functions and display can be realized by the remote control box.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. That is, all equivalent changes and modifications made according to the contents of the present application should be considered to be within the technical scope of the present invention.
Claims (7)
1. A water treatment system for marine low-speed diesel engine EGR, connected to the EGR unit, characterized in that: the water treatment system is of a prying design, integrates a mechanical prying block and a control system, and comprises a circulating water buffer tank, a NaOH solution tank and the control system;
the circulating water buffer tank is connected with the EGR and provides circulating water for the EGR, and has the functions of liquid level alarming, liquid level automatic control, circulating water automatic supply, extremely high liquid level overflow, forced discharge and automatic monitoring and control of water quality turbidity;
the NaOH solution tank is connected with the EGR and provides NaOH solution for the EGR, the system has the functions of liquid level alarm, automatic liquid level control, automatic filling and supplementing and automatic temperature control, and is provided with an input port and an output port;
the control system is respectively connected with the circulating water buffer tank and the NaOH solution tank and comprises two local control devices and a remote control device, the two local control devices are respectively installed on the circulating water buffer tank and the NaOH solution tank, and the remote control device is arranged in a remote centralized control room and is connected and communicated with the local control devices by using a network cable;
the control system controls the circulating water buffer tank to complete the supply, treatment and monitoring of the circulating water of the EGR, and realizes the automatic supply, liquid level alarm and automatic control of the circulating water and the monitoring and automatic control of the water turbidity; the control system controls the NaOH solution tank to complete supply, heating and monitoring of the EGR NaOH solution, and realizes automatic filling and supplementing, liquid level alarming and automatic control of the NaOH solution, and monitoring and automatic control of temperature.
2. The water treatment system for marine low speed diesel EGR of claim 1 wherein: the circulating water buffer tank comprises a buffer tank body, an in-situ control box, a forced discharge pump, a magnetic turning plate type liquid level meter, a signal converter, a turbidity sensor and a frame;
the buffer tank body is used for containing circulating water, is respectively connected with the EGR through a water outlet and a water return port of the circulating water buffer tank, and is connected with a sewage tank through a water discharge port of the circulating water buffer tank;
the forced discharge pump is used for forcibly discharging the circulating water in the buffer tank body, and is connected between the buffer tank body and a water discharge opening of the circulating water buffer tank to form a forced discharge pipeline system;
the magnetic turning plate type liquid level meter is connected to the buffer tank body and used for displaying the liquid level on site and outputting 4-20mA current for remotely displaying the liquid level;
the turbidity sensor is arranged at the top of the buffer tank body and used for monitoring the water quality of the circulating water, and the signal converter is connected with the turbidity sensor and outputs a 4-20mA current signal for the control system to use;
the local control box is connected with the control system and used for integrally controlling the circulating water buffer tank to provide circulating water for the EGR in a manual/automatic control mode, the local control box is connected with the forced discharge pump to realize forced discharge of the circulating water, the magnetic flap type liquid level meter is connected to realize automatic supply of the circulating water, alarm and automatic control of the liquid level, and the signal converter and the turbidity sensor are connected to realize automatic monitoring and control of the water quality turbidity of the circulating water;
the buffer tank body, the local control box, the forced discharge pump, the magnetic turning plate type liquid level meter, the signal converter and the turbidity sensor are integrally installed on the frame.
3. The water treatment system for marine low speed diesel EGR of claim 2 wherein: the effective volume of the buffer tank body is 2m3The material is 316L stainless steel.
4. The water treatment system for marine low speed diesel EGR of claim 2 wherein: the turbidity sensor be provided with 2, mutual reserve, check each other.
5. The water treatment system for marine low speed diesel EGR of claim 1 wherein: the NaOH solution tank comprises a NaOH solution tank body, an on-site control box, a filling pump, a magnetic turning plate type liquid level meter, a floating ball type liquid level controller, an electric heater and a frame;
the NaOH solution tank body is used for containing NaOH solution, is connected with the EGR through an output port of the NaOH solution tank, and is connected with a NaOH supply box through an input port of the NaOH solution tank;
the filling pump has a dual filling/discharging function and is used for filling/discharging NaOH solution in the NaOH solution tank body, an input port of the NaOH solution tank is connected to the upper part of the NaOH solution tank body through the filling pump to form a filling passage, and the bottom of the NaOH solution tank body is connected to the input port of the NaOH solution tank through the filling pump to form a discharging passage;
the magnetic turning plate type liquid level meter is connected to the NaOH solution tank body and used for displaying the liquid level on site and outputting 4-20mA current for remotely displaying the liquid level;
the floating ball liquid level controller is arranged on the NaOH solution tank body and is used for monitoring and alarming liquid level;
the electric heater is arranged on the NaOH solution tank body and used for heating the NaOH solution in the NaOH solution tank body so as to maintain the temperature of the NaOH solution;
the local control box is connected with the control system and used for integrally controlling the NaOH solution tank to provide NaOH solution for the EGR in a manual/automatic control mode, the local control box is connected with the filling pump to realize automatic filling of the NaOH solution, the magnetic flap type liquid level meter is connected to realize automatic replenishment of the NaOH solution, the floating ball liquid level controller is connected to realize alarming and automatic control of the liquid level of the NaOH solution, and the electric heater is connected to realize monitoring, heating and automatic control of the temperature of the NaOH solution;
the NaOH solution tank, the local control box, the filling pump, the magnetic turning plate type liquid level meter, the floating ball liquid level controller and the electric heater are integrally installed on the frame.
6. The water treatment system for marine low speed diesel EGR according to claim 5, wherein: the effective volume of the NaOH solution tank body is 1m3The material is 316L stainless steel.
7. The water treatment system for marine low speed diesel EGR according to claim 5, wherein: two electric heaters are arranged, and the two electric heaters are diagonally arranged on the NaOH solution tank body.
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| CN201811264376.8A CN109157969B (en) | 2018-10-29 | 2018-10-29 | Water treatment system for EGR of marine low-speed diesel engine |
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