A ship methanol engine exhaust gas formaldehyde treatment and monitoring system

Abstract

This invention proposes a formaldehyde treatment and monitoring system for marine methanol engine exhaust, including a methanol engine, exhaust manifold, turbine, compressor, formaldehyde treatment tank, formaldehyde sensor, control and alarm device, three-way valve, air cooler, etc. The invention aims to reduce the formaldehyde content in unconventional emissions from methanol engines to prevent excessive formaldehyde levels in the ship's engine room air from harming the health of engine room personnel. After the methanol engine exhaust flows through the turbine and performs work, it enters the formaldehyde treatment tank after dust removal and undergoes an oxidation-reduction reaction with an oxidant to catalytically decompose formaldehyde, thus achieving the purpose of formaldehyde treatment.

Description

Technical Field

[0001] This invention belongs to the field of marine methanol engine exhaust technology, specifically, it relates to a formaldehyde treatment and monitoring system for marine methanol engine exhaust. Background Technology

[0002] Marine methanol engines are marine propulsion systems that use methanol as fuel. Compared to traditional fuel oil or diesel engines, methanol engines emit less carbon dioxide and particulate matter, exhibiting lower carbon emissions and better environmental performance.

[0003] Therefore, given that the types and amounts of unconventional emissions in the exhaust gas of marine methanol engines differ from those of conventional diesel and gasoline engines, the treatment and monitoring of these unconventional emissions is a crucial aspect that directly impacts the application and development of methanol engines in the field of marine power.

[0004] However, formaldehyde is a typical carcinogenic air pollutant, and the formaldehyde content in the unconventional emissions of methanol engines is several times higher than that of diesel and gasoline engines. The ship's engine room is a relatively enclosed environment, and the formaldehyde in the exhaust of methanol engines can pose a certain health risk to the engine room personnel. Effective formaldehyde treatment is a pressing issue that needs to be addressed for the application of methanol engines in the marine industry.

[0005] Marine methanol engines commonly use EGR technology to reduce emissions, but the EGR rate is limited, and additional technical means are still needed to treat formaldehyde in the exhaust gas. Summary of the Invention

[0006] This invention proposes a formaldehyde treatment and monitoring system for marine methanol engine exhaust to address the unconventional emissions of formaldehyde from methanol engines. This system facilitates the treatment and monitoring of formaldehyde in methanol engine exhaust, aiming to reduce the formaldehyde content in unconventional emissions from methanol engines and prevent excessive formaldehyde levels in the ship's engine room from harming the health of engine room personnel. After the methanol engine exhaust flows through the turbine and performs work, it undergoes dust removal before entering a formaldehyde treatment tank where it undergoes an oxidation-reduction reaction with an oxidant, catalytically decomposing the formaldehyde to achieve the purpose of formaldehyde treatment.

[0007] This invention is achieved through the following technical solution:

[0008] A formaldehyde treatment and monitoring system for exhaust gas from a marine methanol engine, characterized in that:

[0009] The system includes an exhaust gas path, control lines, and multiple connecting pipes.

[0010] The exhaust gas path includes a methanol engine 1, an exhaust manifold 2, a turbine 3, a compressor 4, an ionization dust collector 7, a formaldehyde treatment tank 9, a three-way valve 12, and an air cooler 13.

[0011] The control circuit includes a flow sensor 5, an air pump speed controller 6, an air pump 8, a formaldehyde sensor 10, a controller and alarm 11, and corresponding signal lines and control lines.

[0012] The exhaust manifold 2 is connected to each cylinder of the methanol engine through an exhaust pipe. The exhaust manifold 2 is connected to the turbine 3. The outlet of the turbine 3 is connected to the ionization dust collector 7. A flow sensor 5 is installed in the intermediate pipe.

[0013] Compressor 4 and turbine 3 are connected by the same shaft, air cooler 13 is connected to compressor 4 by a pipeline, and air cooler 13 is connected to cylinder of methanol engine 1 by an intake pipeline.

[0014] Furthermore, the formaldehyde treatment tank 9 also includes a particle adsorption layer 14, a catalyst carrier layer 15, and a loading slot 16 inside;

[0015] Formaldehyde in the exhaust gas flows through the particulate adsorption layer 14 with fresh air to further remove particles from the exhaust gas, and then decomposes into carbon dioxide and water under the catalysis of the catalyst carrier layer 15.

[0016] After catalytic decomposition, the methanol concentration reaches a safe range, and then the exhaust gas flows out of the formaldehyde treatment tank 9 and through the three-way valve 12 into the atmosphere or for further treatment.

[0017] Furthermore, when the formaldehyde sensor 10 detects that the concentration of formaldehyde in the exhaust gas does not exceed the safe range, the three-way valve opens to its minimum, and the exhaust gas flows directly into the atmosphere or other exhaust gas treatment devices.

[0018] The formaldehyde sensor 10 detects the formaldehyde concentration in the exhaust gas flowing out of the formaldehyde treatment tank 9. When the concentration exceeds the safe range for formaldehyde concentration, the controller and alarm 11 will issue an alarm and control the opening of the three-way valve 12 to increase the opening of the three-way valve, so that the exhaust gas returns to the formaldehyde treatment tank 9 for catalytic decomposition. If the alarm is not lifted after the three-way valve is opened to the maximum, more layers of catalyst carrier layer 15 need to be added to the reserved installation slot 16 in the formaldehyde treatment tank 9, or a new catalyst carrier layer 15 needs to be replaced.

[0019] A method for implementing the aforementioned formaldehyde treatment and monitoring system in the exhaust gas of a marine methanol engine:

[0020] The exhaust gas after combustion flows out of the methanol engine 1, is collected through the exhaust manifold 2, and then flows into the turbine 3. The exhaust gas drives the turbine 3 to do work, and the turbine drives the compressor 4 to work. Fresh air is compressed by the compressor 4, cooled by the air cooler 13, and then enters the cylinder of the methanol engine 1 to participate in combustion.

[0021] The air pump speed controller 6 controls the speed of the air pump 8 based on the flow data from the flow sensor 5. Fresh air flows into the formaldehyde treatment tank 9 under the pressure of the air pump 8. The ionization dust collector 7 is connected to the formaldehyde treatment tank 9 through the exhaust pipe. The exhaust gas from the turbine 3 is purged by the ionization dust collector 7 to remove particulate matter before entering the methanol treatment tank 9. The exhaust gas passes through the particulate adsorption layer 14 in the formaldehyde treatment tank 9 to further remove particulate matter and extend the service life of the catalyst. Subsequently, the formaldehyde in the exhaust gas reacts with oxygen under the catalysis of the catalyst carrier layer 15 to decompose into carbon dioxide and water. The treated exhaust gas flows into the atmosphere or is further treated through the three-way valve 12.

[0022] Furthermore, when the formaldehyde sensor 10 detects that the concentration of formaldehyde in the exhaust gas is lower than the safety threshold, the three-way valve opens to its minimum, and the exhaust gas flows directly into the atmosphere or other exhaust gas treatment devices.

[0023] When the concentration of formaldehyde in the exhaust gas exceeds the safety threshold, the controller and alarm 11 will sound an alarm and control the opening of the three-way valve 12 to increase the opening of the exhaust gas back to the formaldehyde treatment tank 9 for catalytic decomposition. If the alarm is not lifted after the three-way valve is opened to the maximum, more layers of catalyst carrier layer 15 need to be added to the reserved installation slot 16 of the formaldehyde treatment tank 9, or a new catalyst carrier layer 15 needs to be replaced.

[0024] Furthermore, the speed control of the air pump 8 is specifically as follows: to ensure that the ratio of oxygen to formaldehyde is greater than 10:1, the speed of the air pump 8 is controlled according to the flow data of the flow sensor 5, and the air introduced into the formaldehyde treatment tank 9 is controlled to ensure that there is sufficient oxygen to react with the formaldehyde.

[0025] An electronic device includes a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of the above method.

[0026] A computer-readable storage medium for storing computer instructions that, when executed by a processor, implement the steps of the above-described method.

[0027] Beneficial effects of the invention

[0028] This invention introduces a formaldehyde treatment device into the field of marine methanol engines, which treats and monitors formaldehyde, thus promoting the application of methanol engines in the field of marine power and protecting the health of ship engine room personnel.

[0029] The present invention has strong structural stability and is not easily affected by the turbulence of the ship. At the same time, the formaldehyde treatment tank has multiple slots inside to increase more carrier layers, reducing the space occupied by the overall system. Furthermore, it provides real-time monitoring of the exhaust gas emissions of the methanol engine, making it suitable for ship navigation.

[0030] This invention can effectively reduce the formaldehyde content in methanol engine exhaust and monitor the formaldehyde concentration in real time. It is low in cost, has a relatively simple control principle, and is easy to implement. The formaldehyde treatment system of this invention can easily meet the formaldehyde emission requirements of the IMO and maritime authorities of various countries. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is a schematic diagram of the formaldehyde treatment tank of the present invention;

[0033] Among them, methanol engine 1, exhaust manifold 2, turbine 3, compressor 4, flow sensor 5, air pump speed controller 6, ionization dust collector 7, air pump 8, formaldehyde treatment tank 9, formaldehyde sensor 10, control and alarm device 11, three-way valve 12, air cooler 13, particulate adsorption layer 14, catalyst carrier layer 15, and mounting slot 16. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Combination Figures 1 to 2 .

[0036] A formaldehyde treatment and monitoring system for marine methanol engine exhaust:

[0037] The system includes an exhaust gas path, control lines, and multiple exhaust / intake pipes for connection.

[0038] The exhaust gas path includes a methanol engine 1, an exhaust manifold 2, a turbine 3, a compressor 4, an ionization dust collector 7, a formaldehyde treatment tank 9, a three-way valve 12, and an air cooler 13.

[0039] The control circuit includes a flow sensor 5, an air pump speed controller 6, an air pump 8, a formaldehyde sensor 10, a controller and alarm 11, and corresponding signal lines and control lines.

[0040] The exhaust manifold 2 is connected to each cylinder of the methanol engine through an exhaust pipe. The exhaust manifold 2 is connected to the turbine 3. The outlet of the turbine 3 is connected to the ionization dust collector 7. A flow sensor 5 is installed in the intermediate pipe.

[0041] Compressor 4 and turbine 3 are connected by the same shaft, air cooler 13 is connected to compressor 4 by a pipeline, and air cooler 13 is connected to cylinder of methanol engine 1 by an intake pipeline.

[0042] The formaldehyde treatment tank 9 also includes a particle adsorption layer 14, a catalyst carrier layer 15, and a loading slot 16.

[0043] Formaldehyde in the exhaust gas flows through the particulate adsorption layer 14 with fresh air to further remove particles from the exhaust gas, and then decomposes into carbon dioxide and water under the catalysis of the catalyst carrier layer 15.

[0044] After catalytic decomposition, the methanol concentration reaches a safe range, and then the exhaust gas flows out of the formaldehyde treatment tank 9 and through the three-way valve 12 into the atmosphere or for further treatment.

[0045] When the formaldehyde sensor 10 detects that the concentration of formaldehyde in the exhaust gas does not exceed the safe range (below 0.1 mg / m³), 3 When the three-way valve is at its minimum opening, the exhaust gas flows directly into the atmosphere or other exhaust gas treatment devices.

[0046] The formaldehyde sensor 10 detects the formaldehyde concentration in the exhaust gas flowing out of the formaldehyde treatment tank 9. If the concentration exceeds the safe range for formaldehyde, the sensor will detect the concentration exceeding the safe value of 0.1 mg / m³. 3 (GB / T18883-2002) The controller and alarm 11 will issue an alarm and control the opening of the three-way valve 12 to return the exhaust gas to the formaldehyde treatment tank 9 for catalytic decomposition. If the alarm is not cleared after the three-way valve is opened to the maximum, more layers of catalyst carrier layer 15 need to be added to the reserved installation slot 16 of the formaldehyde treatment tank 9, or a new catalyst carrier layer 15 needs to be replaced.

[0047] A method for implementing the aforementioned formaldehyde treatment and monitoring system in the exhaust gas of a marine methanol engine:

[0048] The exhaust gas after combustion flows out of the methanol engine 1, is collected through the exhaust manifold 2, and then flows into the turbine 3. The exhaust gas drives the turbine 3 to do work, and the turbine drives the compressor 4 to work. Fresh air is compressed by the compressor 4, cooled by the air cooler 13, and then enters the cylinder of the methanol engine 1 to participate in combustion.

[0049] The air pump speed controller 6 controls the speed of the air pump 8 based on the flow data from the flow sensor 5. Fresh air flows into the formaldehyde treatment tank 9 under the pressure of the air pump 8 to ensure sufficient oxygen to react with the formaldehyde. The ionization dust collector 7 is connected to the formaldehyde treatment tank 9 through the exhaust pipe. The exhaust gas from the turbine 3 is filtered by the ionization dust collector 7 to remove particulate matter before entering the methanol treatment tank 9. The exhaust gas is further purified by the particulate adsorption layer 14 in the formaldehyde treatment tank 9 to extend the service life of the catalyst. Subsequently, the formaldehyde in the exhaust gas reacts with oxygen under the catalysis of the catalyst carrier layer 15 to decompose into carbon dioxide and water. The treated exhaust gas flows into the atmosphere or is further processed through the three-way valve 12.

[0050] When the formaldehyde sensor 10 detects that the concentration of formaldehyde in the exhaust gas is lower than the safety threshold, the three-way valve opens to its minimum, and the exhaust gas flows directly into the atmosphere or other exhaust gas treatment devices.

[0051] When the concentration of formaldehyde in the exhaust gas exceeds the safety threshold, the controller and alarm 11 will sound an alarm and control the opening of the three-way valve 12 to increase the opening of the exhaust gas back to the formaldehyde treatment tank 9 for catalytic decomposition. If the alarm is not lifted after the three-way valve is opened to the maximum, more layers of catalyst carrier layer 15 need to be added to the reserved installation slot 16 of the formaldehyde treatment tank 9, or a new catalyst carrier layer 15 needs to be replaced.

[0052] The speed control of the air pump 8 is specifically as follows: in order to ensure that there is sufficient oxygen to participate in the decomposition reaction of formaldehyde and to ensure that the ratio of oxygen to formaldehyde is greater than 10:1, the speed of the air pump 8 is controlled according to the flow data of the flow sensor 5, and the air introduced into the formaldehyde treatment tank 9 is controlled to ensure that there is sufficient oxygen to react with the formaldehyde.

[0053] An electronic device includes a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of the above method.

[0054] A computer-readable storage medium for storing computer instructions that, when executed by a processor, implement the steps of the above-described method.

[0055] The memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous DRAM (DDR SDRAM), enhanced synchronous DRAM (ESDRAM), synchronous linked DRAM (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory of the methods described in this invention is intended to include, but is not limited to, these and any other suitable types of memory.

[0056] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired means such as coaxial cable, optical fiber, digital subscriber line, DSL, or wireless means such as infrared, wireless, microwave, etc. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium such as a floppy disk, hard disk, magnetic tape; an optical medium such as a high-density digital video disc, DVD; or a semiconductor medium such as a solid-state disk, SSD, etc.

[0057] In implementation, each step of the above method can be completed by integrated logic circuits in the processor's hardware or by instructions in software. The steps of the method disclosed in the embodiments of this application can be directly implemented by a hardware processor, or by a combination of hardware and software modules in the processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, detailed descriptions are omitted here.

[0058] It should be noted that the processor in the embodiments of this application can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method embodiments can be completed by the integrated logic circuits in the processor's hardware or by instructions in software form. The processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied as execution by a hardware decoding processor, or as execution by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory; the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above methods.

[0059] The above provides a detailed description of the formaldehyde treatment and monitoring system for marine methanol engine exhaust proposed in this invention, and elucidates the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this invention. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A formaldehyde treatment and monitoring system for exhaust gas from a marine methanol engine, characterized in that: The system includes an exhaust gas path, control lines, and multiple connecting pipes. The exhaust gas path includes a methanol engine (1), an exhaust manifold (2), a turbine (3), a compressor (4), an ionization dust collector (7), a formaldehyde treatment tank (9), a three-way valve (12), and an air cooler (13). The control circuit includes a flow sensor (5), an air pump speed controller (6), an air pump (8), a formaldehyde sensor (10), a control and alarm device (11), and corresponding signal lines and control lines. The exhaust manifold (2) is connected to each cylinder of the methanol engine through an exhaust pipe. The exhaust manifold (2) is connected to the turbine (3). The outlet of the turbine (3) is connected to the ionization dust collector (7). A flow sensor (5) is installed in the intermediate pipe. The compressor (4) and the turbine (3) are connected by the same shaft, the air cooler (13) and the compressor (4) are connected by a pipeline, and the air cooler (13) and the cylinder of the methanol engine (1) are connected by an intake pipeline. When the formaldehyde sensor (10) detects that the concentration of formaldehyde in the exhaust gas does not exceed the safe range, the three-way valve opens to its minimum, and the exhaust gas flows directly into the atmosphere or other exhaust gas treatment devices. The formaldehyde sensor (10) detects the formaldehyde concentration of the exhaust gas after it flows out of the formaldehyde treatment tank (9). When the concentration exceeds the safe range of formaldehyde concentration, the controller and alarm (11) will issue an alarm and control the opening of the three-way valve (12) to increase the opening of the three-way valve so that the exhaust gas returns to the formaldehyde treatment tank (9) for catalytic decomposition. If the alarm is not lifted after the three-way valve is opened to the maximum, more layers of catalyst carrier layer (15) need to be added to the reserved installation slot (16) in the formaldehyde treatment tank (9), or a new catalyst carrier layer (15) needs to be replaced.

2. The formaldehyde treatment and monitoring system according to claim 1, characterized in that: The formaldehyde treatment tank (9) also includes a particle adsorption layer (14), a catalyst carrier layer (15), and a loading slot (16). Formaldehyde in the exhaust gas flows through the particulate adsorption layer (14) with fresh air to further remove the particulates in the exhaust gas, and then decomposes into carbon dioxide and water under the catalysis of the catalyst carrier layer (15). After catalytic decomposition, the concentration of methanol reaches a safe range, and then the tail gas flows out of the formaldehyde treatment tank (9) and flows into the atmosphere or for further treatment through the three-way valve (12).

3. A method for implementing the formaldehyde treatment and monitoring system in the exhaust gas of a marine methanol engine as described in any one of claims 1 or 2, characterized in that: The exhaust gas after combustion flows out of the methanol engine (1), is collected through the exhaust manifold (2), and flows into the turbine (3). The exhaust gas drives the turbine (3) to do work, and the turbine drives the compressor (4) to work. Fresh air is compressed by the compressor (4), cooled by the air cooler (13), and then enters the cylinder of the methanol engine (1) to participate in combustion. The air pump speed controller (6) controls the speed of the air pump (8) according to the flow data of the flow sensor (5). Fresh air flows into the formaldehyde treatment tank (9) under the pressure of the air pump (8). The ionization dust collector (7) is connected to the formaldehyde treatment tank (9) through the exhaust pipe. The exhaust gas from the turbine (3) is removed by the ionization dust collector (7) and enters the methanol treatment tank 9 after removing particulate matter. The exhaust gas is further removed by the particulate adsorption layer (14) in the formaldehyde treatment tank (9) to extend the service life of the catalyst. Then, the formaldehyde in the exhaust gas reacts with oxygen under the catalysis of the catalyst carrier layer (15) and decomposes into carbon dioxide and water. The treated exhaust gas flows into the atmosphere or is further treated through the three-way valve (12).

4. The method according to claim 3, characterized in that: When the formaldehyde sensor (10) detects that the concentration of formaldehyde in the exhaust gas is lower than the safety threshold, the three-way valve opens to its minimum, and the exhaust gas flows directly into the atmosphere or other exhaust gas treatment devices. When the concentration of formaldehyde in the exhaust gas is higher than the safety threshold, the controller and alarm (11) will issue an alarm and control the opening of the three-way valve (12) to increase the opening of the three-way valve so that the exhaust gas returns to the formaldehyde treatment tank (9) for catalytic decomposition. If the alarm is not lifted after the three-way valve is opened to the maximum, more layers of catalyst carrier layer (15) need to be added to the reserved installation slot (16) in the formaldehyde treatment tank (9), or a new catalyst carrier layer (15) needs to be replaced.

5. The method according to claim 4, characterized in that: The speed control of the air pump (8) is specifically as follows: to ensure that the ratio of oxygen to formaldehyde is greater than 10:1, the speed of the air pump (8) is controlled according to the flow data of the flow sensor (5), and the air introduced into the formaldehyde treatment tank (9) is controlled to ensure that there is enough oxygen to react with the formaldehyde.

6. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 3 to 5.

7. A computer-readable storage medium for storing computer instructions, characterized in that, When the computer instructions are executed by the processor, they implement the steps of the method according to any one of claims 3 to 5.

Images