CN217632628U - Reducing agent supply system for engine exhaust treatment - Google Patents
Reducing agent supply system for engine exhaust treatment Download PDFInfo
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- CN217632628U CN217632628U CN202222038262.XU CN202222038262U CN217632628U CN 217632628 U CN217632628 U CN 217632628U CN 202222038262 U CN202222038262 U CN 202222038262U CN 217632628 U CN217632628 U CN 217632628U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/12—Improving ICE efficiencies
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Abstract
The utility model discloses a reducing agent supply system for engine tail gas treatment, which comprises a raw agent storage cabin, an injection unit, a monitoring unit, a control system and a pump power circuit, wherein a liquid outlet of the reducing agent storage cabin is connected with an inlet of the injection unit through a supply pipeline; the monitoring unit comprises a centrifugal pump, a first pressure sensor P1, a second pressure sensor P2, a pressure stabilizing valve FV and an electromagnetic valve M1 which are sequentially connected in series on a supply pipeline, wherein a discharge port of the pressure stabilizing valve FV is connected with a liquid inlet of the reducing agent storage cabin, an inlet end of the centrifugal pump is connected with a liquid outlet of the reducing agent storage cabin, and the electromagnetic valve M1 is connected with an inlet end of the injection unit; the input end of the pump power supply circuit is connected with a high-power supply, and the output end of the pump power supply circuit is connected with a centrifugal pump; the control system is respectively connected with the centrifugal pump, the first pressure sensor P1, the second pressure sensor P2, the electromagnetic valve M1 and the direct-current power supply. The utility model discloses can stabilize the supply of steady voltage reductant for a long time to realize the accurate control of reductant injection quantity.
Description
Technical Field
The utility model belongs to the technical field of the diesel engine tail gas aftertreatment technique and specifically relates to a reductant supply system for engine exhaust handles is related to.
Background
With the gradual implementation of the domestic and foreign engine emission regulations, the control on the emission limit value of the emission period pollutants is more and more strict, and a Selective Catalytic Reduction (SCR) method as a technical route for reducing NOx becomes a recognized technical route for reducing NO of the engine x An effective way of emission, wherein the reducing agent is urea solution.
Urea solution is pyrolyzed into NH in high-temperature exhaust gas of engine 3 ，NH 3 And NO in the exhaust gas X After fully reacting in the reaction chamber, N is generated 2 And H 2 And O, thereby achieving the effect of purifying the exhaust gas. During this purification process, insufficient supply of NO in the exhaust gas may cause the generation of NO in the exhaust gas X The reaction is insufficient, the exhaust emission of the engine can not meet the requirements of relevant regulations, and the environment is polluted, but if the reducing agent is supplied in a large amount, not only can the resource be wasted, but also secondary pollution caused by ammonia leakage can be generated. Therefore, the accurate control of the injection amount of the reducing agent is a key technology for tail gas purification treatment, and the accurate control of the injection amount of the reducing agent requires that the reducing agent is continuously supplied under specified pressure, namely, stable and stable continuous supply, but the prior art cannot realize the stable and stable continuous supply of the reducing agent or cannot find problems in a supply system in time, so that the control accuracy of the reducing agent is insufficient or the injection is interrupted, and ammonia leakage or the condition that the tail gas emission of an engine does not reach the standard is caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the present invention provides a reducing agent supply system for treating engine exhaust, which can realize the purpose of stable and continuous supply of reducing agent, thereby realizing the precise control of the injection amount of reducing agent.
According to the utility model discloses a reductant feed system for engine exhaust handles, include
The reducing agent storage cabin is provided with a liquid inlet and a liquid outlet, and the liquid outlet is connected with an inlet of the injection unit through a supply pipeline;
the monitoring unit comprises a centrifugal pump, a first pressure sensor P1, a pressure stabilizing valve FV, a second pressure sensor P2 and an electromagnetic valve M1 which are sequentially connected with a supply pipeline, wherein a discharge port of the pressure stabilizing valve FV is connected with a liquid inlet of a reducing agent storage cabin, an inlet end of the centrifugal pump is connected with a liquid outlet of the reducing agent storage cabin, and the electromagnetic valve M1 is connected with an inlet end of an injection unit;
the control system is respectively connected with the centrifugal pump, the first pressure sensor P1, the second pressure sensor P2, the electromagnetic valve M1 and a direct-current power supply;
the input end of the pump power supply circuit is connected with a high-power supply, and the output end of the pump power supply circuit is connected with the centrifugal pump.
In some embodiments, the utility model discloses control system includes MCU controller and control circuit, control circuit includes thermal protection relay F normally closed auxiliary contact F-1, thermal protection relay F's normally open contact F-2 and contactor KM, the pump power supply circuit is three-phase alternating current circuit, thermal protection relay F, contactor KM normally open contact KM-1 and miniature circuit breaker QF have concatenated on the three-phase alternating current circuit in proper order;
the system comprises an MCU controller working power supply input port L + connected with a direct-current power supply anode, an MCU controller working power supply input port M connected with a direct-current power supply cathode, MCU controller switching value signal ports I1M and I0.0 respectively connected with two ends of a normally open contact F-2 of a thermal protection relay F and used for collecting signals of the normally open contact F-2 of the thermal protection relay F, an input end O1M of the MCU controller switching value output port connected with the direct-current power supply anode, and an output end 00.0 of the MCU controller switching value output port sequentially connected with the normally closed contact F-1 of the thermal protection relay F, a coil of a contactor KM and the direct-current power supply cathode in series; the input end of the miniature circuit breaker QF is connected with a high-power supply, and the output end of the thermal protection relay F is connected with the centrifugal pump. This embodiment protects the centrifugal pump through thermal protection relay F, contactor KM and short-circuit protection circuit breaker QF, has prolonged the life of centrifugal pump.
In some embodiments, the utility model discloses the centrifugal pump includes first centrifugal pump A and second centrifugal pump B, first centrifugal pump A with second centrifugal pump B connects in parallel on the supply line, first centrifugal pump A with second centrifugal pump B respectively through all the way power supply circuit with high-power links to each other, respectively through all the way control circuit with the controller links to each other. The first centrifugal pump A and the second centrifugal pump B are of a redundant structure, namely the two centrifugal pumps are mutually backup pumps, when the first centrifugal pump A breaks down, the control system starts the second centrifugal pump B, and when the second centrifugal pump B breaks down, the control system starts the first centrifugal pump A, so that the running stability of the supply system is effectively ensured.
In some embodiments, the first centrifugal pump a is connected with control valves QY1 and QY2 at two ends, and the second centrifugal pump B is connected with control valves QY3 and QY4 at two ends. According to the embodiment, the fault pump can be overhauled under the operation condition of the supply system, the maintenance function of the centrifugal pump under the operation condition of the supply system is realized, and the continuous supply of the reducing agent is ensured.
In some embodiments, the utility model discloses still include audible-visual annunciator, audible-visual annunciator with the controller links to each other, and when the feed system appearance is unusual, audible-visual annunciator sends the chimes of doom and lights the warning light.
In some embodiments, the utility model discloses still include the display that is used for showing alarm signal and control command, the display with the controller links to each other, and alarm signal and control command can be seen through the display to the staff.
Compared with the prior art, the utility model has the advantages of it is following:
1) The utility model discloses the centrifugal pump is from reductant storage cabin extraction reductant and pressurized transport reductant, carries to injection system after the surge damping valve steady voltage, has guaranteed that the reductant pressure stability who carries injection system is in the setting value, guarantees injection system's reductant flow control's precision through stable pressure control to reachThe atomizing effect of the continuous stable pressure supply of the reducing agent and the aim of accurately controlling the injection quantity of the reducing agent are achieved, and the NO in the tail gas caused by the too-low supply of the reducing agent is effectively avoided X The reducing agent cannot be reduced to the requirement range of relevant regulations, and the environment is polluted, or the reducing agent is supplied too much and the reaction of the reducing agent is incomplete, so that the reducing agent is leaked, and the secondary pollution is caused to the environment.
2) In the reducing agent conveying process, the controller detects the pressure of the reducing agent in the supply pipeline before pressure stabilization through the first pressure sensor P1, and judges whether the supply pump works normally through the logic processing module according to a received pressure signal; the controller detects the pressure of the stabilized reducing agent in the supply pipeline through the second pressure sensor P, and judges whether the operation of the voltage stabilizer FV is normal or not through the logic processing module according to the received pressure signal, so that the conveying effectiveness and the pressure stabilizing effect of the reducing agent are monitored, the stable and stabilized conveying of the reducing agent to the injection system is ensured, and the automation degree is high.
3) The utility model discloses constitute by two each other for reserve centrifugal pump, stabiliser and pressure sensor, the centrifugal pump is used one by one in the system and is equipped with for reserve, and each other is for reserve, and control system detects the running state of centrifugal pump, when a centrifugal pump goes out the problem, sends this centrifugal pump fault signal, automatic start spare pump simultaneously. The utility model discloses the stabiliser is adjustable, and the back is set to the pressure value, detects logic through pressure sensor and judges stabiliser operating condition.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic diagram of a centrifugal pump control circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a pump power supply circuit according to an embodiment of the present invention;
fig. 4 is a flow chart for switching the centrifugal pump according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary intended for explaining the present invention, and should not be construed as limiting the present invention.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the applicability of other processes and/or the use of other materials.
Referring to fig. 1, a reductant supply system for treating engine exhaust according to the present embodiment includes a reductant storage tank, an injection unit, a monitoring unit, a control system, and a pump power circuit; the reducing agent storage cabin supplies the reducing agent to the injection unit through the supply pipeline, and the reducing agent is injected into the reaction chamber through the injection unit and reacts with NO in the tail gas X After fully reacting in the reaction chamber, N is generated 2 And H 2 And O, thereby achieving the effect of purifying tail gas and reducing the pollution to the environment.
The reducing agent storage cabin is provided with a liquid inlet and a liquid outlet, and the liquid outlet is connected with the inlet of the injection unit through a supply pipeline; the monitoring unit comprises a centrifugal pump, a first pressure sensor P1, a pressure stabilizing valve FV, a second pressure sensor P2 and an electromagnetic valve M1 which are sequentially connected in series on a supply pipeline, wherein a discharge port of the pressure stabilizing valve FV is connected with a liquid inlet of a reducing agent storage cabin, an inlet end of the centrifugal pump is connected with a liquid outlet of the reducing agent storage cabin, and the electromagnetic valve M1 is connected with an inlet end of an injection unit; the control system is respectively connected with the centrifugal pump, the first pressure sensor P1, the second pressure sensor P2, the electromagnetic valve M1 and a direct-current power supply; the input end of the pump power supply circuit is connected with a high-power supply, the output end of the pump power supply circuit is connected with the centrifugal pump, the pump power supply circuit outputs AC380V alternating current power supply, and the direct current power supply adopts DC240V direct current power supply. Because of the importance and power of centrifugal pumps are great, centrifugal pumps use independent power supplies to work.
The first pressure sensor P1 is used for detecting pressure information of the reducing agent after passing through the centrifugal pump in the supply pipeline and transmitting the pressure information to the control system, the second pressure sensor P2 is used for detecting pressure information of the reducing agent after being stabilized by the adjustable pressure stabilizing valve FV in the supply pipeline and transmitting the pressure information to the control system, and the control system judges whether the pressure of the reducing agent in the supply pipeline meets the set pressure according to the received pressure information, so that whether the supply system stably conveys the reducing agent or not is judged.
Referring to fig. 2 and 3, in order to protect the centrifugal pump and prolong the service life of the centrifugal pump, in some embodiments, the control system of the present invention includes an MCU controller and a control circuit, the control circuit includes a normally closed auxiliary contact F-1 of a thermal protection relay F, a normally open contact F-2 of the thermal protection relay F, and a contactor KM, the pump power circuit is a three-phase ac circuit, and the thermal protection relay F, the normally open contact KM-1 of the contactor KM, and a miniature circuit breaker QF are sequentially connected in series on the three-phase ac circuit; the system comprises an MCU controller working power supply input port L + and an MCU controller switching value signal port I1M, wherein the MCU controller working power supply input port M is connected with a direct-current power supply anode, the MCU controller switching value signal port I0.0 is respectively connected with two ends of a normally open contact F-2 of a thermal protection relay F and used for collecting signals of the normally open contact F-2 of the thermal protection relay F, the input end O1M of the MCU controller switching value output port is connected with the direct-current power supply anode, and the output end 00.0 is connected with the normally closed contact F-1 of the thermal protection relay F, a coil of a contactor KM and the direct-current power supply cathode in series at one time; the input end of the miniature circuit breaker QF is connected with a high-power supply, and the output end of the thermal protection relay F is connected with a centrifugal pump. The control system of the embodiment is used for detecting whether the working state of the centrifugal pump is normal, controlling whether the centrifugal pump works and controlling the on-off of a power circuit of the pump. The pump power supply circuit is used for supplying power to the centrifugal pump, and meanwhile, the thermal protection relay F, the contactor KM and the short-circuit protection breaker QF are arranged on the pump power supply circuit to protect the centrifugal pump, so that the service life of the centrifugal pump is prolonged.
Referring to fig. 1, in order to ensure stable operation of the supply system, in some embodiments, the centrifugal pump of the present invention is provided with two: the first centrifugal pump A and the second centrifugal pump B are connected on a supply pipeline in parallel, and are respectively connected with the high-power supply through one pump power supply circuit and the MCU controller through one control circuit. The two centrifugal pumps are standby pumps, the first centrifugal pump A and the second centrifugal pump B are respectively connected with a high-power supply through a power supply circuit, namely, each centrifugal pump is connected with a pump power supply circuit, the first centrifugal pump A and the second centrifugal pump B are respectively connected with the MCU through a control circuit, namely, each centrifugal pump is connected with a control circuit. When the first centrifugal pump A has an overload fault, the thermal protection relay F in the power circuit of the first centrifugal pump A sends a fault signal of the first centrifugal pump A to the MCU controller, meanwhile, the normally closed contact F-1 of the thermal protection relay F is disconnected, the control circuit of the first centrifugal pump A is disconnected, the coil of the contactor KM is powered off, the normally open contact KM-1 of the contactor KM is released, the power of the first centrifugal pump A is disconnected, the first centrifugal pump A is powered off and stops working, the MCU controller controls the second centrifugal pump B to work, when the second centrifugal pump B has a fault or is in an abnormal working state, the MCU controller restarts the first centrifugal pump A, the reliability of the operation of a supply system is guaranteed, and the working efficiency is improved.
Referring to fig. 1, in order to facilitate the maintenance of the failed pump, in some embodiments, the first centrifugal pump a is connected with control valves QY1 and QY2 at both ends, and the second centrifugal pump B is connected with control valves QY3 and QY4 at both ends. When the first centrifugal pump A breaks down, the MCU controller controls the first centrifugal pump A to stop working, the second centrifugal pump B is started, and at the moment, a worker can cut off the control valves QY1 and QY2 at the two ends of the first centrifugal pump A to overhaul the first centrifugal pump A without influencing the normal operation of the second centrifugal pump B. Similarly, when second centrifugal pump B broke down, MCU controller control second centrifugal pump B stop work, start first centrifugal pump A, the staff cuts off the control valve QY3 at second centrifugal pump B both ends, QY4, overhauls second centrifugal pump B, does not influence first centrifugal pump A's normal operating, the scheme of this embodiment need not to break off pump power supply circuit and can overhaul the centrifugal pump, guaranteed supplying with continuously of reductant, improved work efficiency.
In some embodiments, the utility model discloses still include audible-visual annunciator, audible-visual annunciator with the MCU controller links to each other.
Referring to fig. 1 to fig. 4, based on the above embodiment, the specific working process of the present invention is as follows:
s1, setting pressure values P '1 and P'2 in an MCU controller;
s2, determining that a supply pipeline is not blocked, and adjusting a set value of a pressure stabilizing valve FV according to a pressure value required by a tail gas discharge system;
s3, detecting whether the first centrifugal pump A has a fault by the MCU controller, if the first centrifugal pump A has no fault, sending a starting instruction to the first centrifugal pump A, closing a switch SB contact in a control circuit of the first centrifugal pump A, electrifying a coil of a contactor KM, closing a contactor KM normally open contact KM-1, switching on a power supply of the first centrifugal pump A, starting the first centrifugal pump A, if the first centrifugal pump A has no fault, extracting a reducing agent by the first centrifugal pump A and conveying the reducing agent to an injection unit, detecting pressure values in a supply pipeline in real time by a first pressure sensor P1 and a second pressure sensor P2 in the conveying process, transmitting the detected pressure values to the MCU controller in real time, and entering the step S4; and if the first centrifugal pump A has a fault, which indicates that the supply of the first centrifugal pump A fails, controlling the first centrifugal pump A to stop working, and simultaneously entering steps S5 and S7.
S4, judging whether the pressure value detected by the first sensor P1 is normal:
if the pressure value detected by the first pressure sensor P1 is within the pressure value P'1 range set by the MCU controller, the pressure value detected by the first pressure sensor P1 is normal, which indicates that the currently running centrifugal pump works normally and the supply of the reducing agent is effective, and the step S6 is entered;
if the pressure value detected by the first pressure sensor P1 is not within the pressure value P'1 range set by the MCU controller, the MCU controller judges that the supply of the reducing agent by the currently running centrifugal pump fails, the MCU controller controls the currently running centrifugal pump to stop working, and the step S5 is entered.
S5, detecting whether the second centrifugal pump B is in fault by the MCU, if the second centrifugal pump B is not in fault, controlling the second centrifugal pump B to work, sending a starting instruction to the second centrifugal pump B, closing a switch SB contact in a control circuit of the second centrifugal pump B, electrifying a contactor KM coil, closing a contactor KM normally open contact KM-1, connecting a power supply of the second centrifugal pump B, starting the second centrifugal pump B to work, pumping a reducing agent by the second centrifugal pump B and conveying the reducing agent to an injection system, detecting pressure values in a supply pipeline in real time by a first pressure sensor P1 and a second pressure sensor P2 in the conveying process, conveying the pressure values to the MCU in real time, and entering the step S4; and if the second centrifugal pump B has a fault, which indicates that the supply of the second centrifugal pump B fails, controlling the second centrifugal pump B to stop working, and simultaneously entering steps S3 and S8.
S6, judging whether the pressure value detected by the second sensor P2 is normal:
if the second pressure sensor P2 is in the pressure value P'2 range set by the MCU controller, the pressure value detected by the second pressure sensor P2 is normal, which indicates that the pressure stabilizing valve FV works normally, the MCU controller controls the electromagnetic valve M1 to open, supplies a reducing agent to the injection unit, and the reducing agent is injected into the reaction chamber through the injection unit and reacts with NO in the tail gas X After fully reacting in the reaction chamber, N is generated 2 And H 2 O, thereby achieving the effect of purifying the tail gas, leading the tail gas emission to accord with relevant regulations and reducing the pollution to the environment;
if the pressure value detected by the second pressure sensor P2 is not within the pressure value P'2 range set by the MCU controller, the pressure value detected by the second pressure sensor P2 is abnormal, the fault of the pressure stabilizing valve FV is explained, the MCU controller controls the centrifugal pump which operates at present to stop working, the MCU controller outputs an alarm signal 3, and simultaneously controls the audible and visual alarm to give out alarm sound and light a warning lamp so as to remind a worker that the pressure stabilizing valve FV is abnormal and needs to be overhauled in time.
S7, the MCU controller outputs an alarm signal 1 to the display, and simultaneously controls the audible and visual alarm to give an alarm and light a warning lamp to remind a worker that the supply of the reducing agent of the first centrifugal pump A is invalid and the first centrifugal pump A is overhauled in time.
And S8, the MCU controller outputs an alarm signal 2 to the display, and simultaneously controls the audible and visual alarm to give out an alarm sound and turn on the warning lamp to remind a worker that the supply of the reducing agent of the second centrifugal pump B is invalid and the second centrifugal pump B is overhauled in time.
When the first centrifugal pump A breaks down, the system is switched to the second centrifugal pump B, the worker timely overhauls the first centrifugal pump A, when the second centrifugal pump B breaks down, the system is switched to the first centrifugal pump A, the worker timely overhauls the second centrifugal pump B, the supply system is provided with two centrifugal pumps which are mutually standby pumps, and stable operation of the supply system is effectively guaranteed.
The MCU controller judges whether the centrifugal pump has a fault or not and controls the fault pump to stop working according to the principle that:
if the thermal protection relay F in the control circuit of the first centrifugal pump A is abnormal, the situation that the first centrifugal pump A has overload or short-circuit faults is indicated, the thermal protection relay F in the control circuit of the first centrifugal pump A sends a fault signal of the first centrifugal pump A to the MCU controller, meanwhile, the normally closed contact F-1 of the thermal protection relay F in the pump power circuit of the first centrifugal pump A is disconnected, the control circuit of the first centrifugal pump A is disconnected, the contactor KM in the control circuit of the first centrifugal pump A loses power, the normally open contact KM-1 of the contactor KM is released, the pump power circuit of the first centrifugal pump A is disconnected, the first centrifugal pump A loses power and stops working, the MCU controller outputs an alarm signal 3 to the display, meanwhile, the audible and visual alarm is controlled to give out alarm sound and light a warning lamp, and meanwhile, the miniature circuit breaker QF in the control circuit of the first centrifugal pump A acts to cut off the corresponding pump power circuit and protect the first centrifugal pump A.
Similarly, if the thermal protection relay F in the control circuit of the second centrifugal pump B is abnormal, which indicates that the second centrifugal pump B has overload or short-circuit fault, the thermal protection relay F in the control circuit of the second centrifugal pump B sends a fault signal of the second centrifugal pump B to the MCU controller, meanwhile, the thermal protection relay F normally-closed contact F-1 in the pump power circuit of the second centrifugal pump B is disconnected, the control circuit of the second centrifugal pump B is disconnected, the contactor KM in the control circuit of the second centrifugal pump B is powered off, the contactor KM normally-open contact KM-1 is released, the pump power circuit of the second centrifugal pump B is disconnected, the second centrifugal pump B is powered off and stops working, the MCU controller outputs an alarm signal 4 to the display, and meanwhile, the audible and visual alarm is controlled to give an alarm sound and light the alarm lamp, and meanwhile, the miniature circuit breaker QF in the control circuit of the second centrifugal pump B operates to cut off the corresponding pump power circuit to protect the second centrifugal pump B.
The utility model discloses supply line is through adjustable surge damping valve, in advance with supply line pressure setting at appointed pressure value, preset pressure value in surge damping valve promptly, supply system during operation judges through pressure monitoring and preset pressure contrast on the one hand whether supply line has the jam or reveals the phenomenon, make supply line pressure in appointed pressure range, thereby guaranteed to reach the accurate control of injection volume through reducing agent delivery pressure in adjusting the pipeline, realized continuously supplying under stable pressure to reducing agent volume simultaneously, it is inaccurate to have avoided leading to reducing agent injection volume control because of supply line internal pressure unstability, thereby lead to the reducing agent to lead to NO to lead to the lack of NO to control X Incomplete reaction results in substandard tail gas or excessive reductant results in ammonia leakage.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present application, unless expressly stated or limited otherwise, the first feature may be directly on or directly under the second feature or indirectly via intermediate members. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (6)
1. A reducing agent supply system for engine tail gas treatment is characterized by comprising a reducing agent storage cabin and an injection unit, wherein the reducing agent storage cabin is provided with a liquid inlet and a liquid outlet, and the liquid outlet is connected with an inlet of the injection unit through a supply pipeline;
the monitoring unit comprises a centrifugal pump, a first pressure sensor P1, a pressure stabilizing valve FV, a second pressure sensor P2, a pressure stabilizing valve FV and an electromagnetic valve M1 which are sequentially connected with a supply pipeline, wherein a discharge opening of the pressure stabilizing valve FV is connected with a liquid inlet of a reducing agent storage cabin, an inlet end of the centrifugal pump is connected with a liquid outlet of the reducing agent storage cabin, and the electromagnetic valve M1 is connected with an inlet end of an injection unit;
the control system is respectively connected with the centrifugal pump, the first pressure sensor P1, the second pressure sensor P2, the electromagnetic valve M1 and a direct-current power supply;
and the input end of the pump power supply circuit is connected with a high-power supply, and the output end of the pump power supply circuit is connected with the centrifugal pump.
2. The reducing agent supply system for engine exhaust treatment according to claim 1, characterized in that the control system comprises a MCU controller and a control circuit, the control circuit comprises a normally closed auxiliary contact F-1 of a thermal protection relay F, a normally open contact F-2 of the thermal protection relay F and a contactor KM, the pump power circuit is a three-phase alternating current circuit, and the thermal protection relay F, the normally open contact KM-1 of the contactor KM and a miniature circuit breaker QF are connected in series on the three-phase alternating current circuit in sequence;
the system comprises an MCU controller working power supply input port L + and an MCU controller switching value signal port I1M, wherein the MCU controller working power supply input port M is connected with a direct-current power supply anode, the MCU controller switching value signal port I0.0 is respectively connected with two ends of a normally open contact F-2 of a thermal protection relay F and is used for collecting signals of the normally open contact F-2 of the thermal protection relay F, the input end O1M of the MCU controller switching value output port is connected with the direct-current power supply anode, and the output end 00.0 is sequentially connected with the normally closed contact F-1 of the thermal protection relay F, a coil of a contactor KM and the direct-current power supply cathode in series; the input end of the miniature circuit breaker QF is connected with a high-power supply, and the output end of the thermal protection relay F is connected with the centrifugal pump.
3. The system of claim 2, wherein the centrifugal pumps comprise a first centrifugal pump A and a second centrifugal pump B, the first centrifugal pump A and the second centrifugal pump B are connected in parallel on a supply pipeline, the first centrifugal pump A and the second centrifugal pump B are respectively connected with a high-power supply through one pump power supply circuit, and are respectively connected with the MCU controller through one control circuit.
4. A reductant supply system for the treatment of engine exhaust according to claim 3, characterized in that control valves QY1, QY2 are connected to the ends of said first centrifugal pump a, respectively, and control valves QY3, QY4 are connected to the ends of said second centrifugal pump B, respectively.
5. A reductant supply system for the treatment of engine exhaust according to claim 3 or 4, further comprising an audible and visual alarm connected to said MCU controller.
6. The reductant supply system for engine exhaust treatment according to claim 5, further comprising a display for displaying alarm signals and control commands, said display being connected to said MCU controller.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116857044A (en) * | 2023-06-27 | 2023-10-10 | 沪东重机有限公司 | Marine diesel engine exhaust treatment system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116857044A (en) * | 2023-06-27 | 2023-10-10 | 沪东重机有限公司 | Marine diesel engine exhaust treatment system |
| CN116857044B (en) * | 2023-06-27 | 2024-05-14 | 沪东重机有限公司 | Marine diesel engine exhaust treatment system |
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