A methanol reforming hydrogen production device using high-temperature gas heat supply and a control strategy

Abstract

The application provides a methanol reforming hydrogen production device using high-temperature gas heat supply and a control strategy, which comprises a shell, a heat exchange channel and a reforming hydrogen production chamber, two cavities are arranged in the shell, a heat exchange channel is arranged in the lower cavity, the outlet of the heat exchange channel is communicated with the upper cavity through a fluid guiding unit, the inlet of the heat exchange channel is communicated with a tail gas conveying system and a methanol aqueous solution conveying system respectively, the upper cavity is divided into the reforming hydrogen production chamber and a collecting chamber through an annular partition plate, the reforming hydrogen production chamber is communicated with the collecting chamber, the collecting chamber is communicated with a hydrogen collecting system and is used for collecting hydrogen, and the reforming hydrogen production chamber is coated with a methanol reforming catalyst. The application has the characteristics of high hydrogen production rate and stable hydrogen production system control.

Description

TECHNICAL FIELD

[0001] The present application relates to hydrogen internal combustion engine technology field, especially to a kind of hydrogen device and control strategy for methanol reforming using high-temperature gas heating. BACKGROUND

[0002] Research shows that hydrogen is one of the excellent alternative clean energy, and many domestic and foreign researches have also proved that the scheme of introducing hydrogen and fuel oil for mixed combustion is feasible, by introducing hydrogen into internal combustion engine for mixed combustion, the combustion efficiency is improved, and the emission of pollutants is reduced. Hydrogen has many excellent properties, and the combustion product is water, which does not pollute the environment. By on-site preparation of hydrogen as raw material for internal combustion engine hydrogen combustion is an effective means to overcome this obstacle.

[0003] Among the many hydrogen production processes, methanol steam reforming for hydrogen production has attracted attention due to its mild reaction, high hydrogen production and other characteristics. The reaction is an endothermic reaction, the reaction temperature is low, the hydrogen production is high, and the tail gas waste heat can be used to heat the reaction, so it has obvious advantages. By modifying the internal combustion engine, adding a heat exchanger and a methanol hydrogen reforming reactor, catalytic reforming hydrogen is produced, and the generated hydrogen is introduced into the internal combustion engine for combustion. It can improve the combustion efficiency of fuel in internal combustion engine, and reduce the content of pollutants in tail gas.

[0004] The prior art discloses a methanol reforming hydrogen device using tail gas waste heat, but the existing invention still has the disadvantages of large volume, unable to adjust the working condition according to different working conditions of internal combustion engine. SUMMARY

[0005] In view of the deficiencies in the prior art, the present application provides a methanol reforming hydrogen device using high-temperature gas heating and control strategy, a first boss array area and a second boss array area are arranged in the reforming hydrogen chamber, the first boss array area and the second boss array area are used as reflection carriers and connected with the spiral disc-shaped heat exchange channel. The reforming hydrogen device uses high-temperature gas heating, and can adjust the working condition of the reforming hydrogen device according to different working conditions of internal combustion engine, has the characteristics of small volume, high hydrogen production rate, stable hydrogen production system control and the like.

[0006] The present application achieves the above technical purpose by the following technical means.

[0007] The utility model provides a kind of hydrogen production device for methanol reforming using high-temperature gas heat supply, including shell, heat exchange passage, reforming hydrogen chamber, the shell inside is equipped with two cavities, lower cavity is equipped with heat exchange passage, the heat exchange passage outlet is communicated with upper cavity by fluid guiding unit;The heat exchange passage inlet is communicated with exhaust gas delivery system and methanol aqueous solution delivery system respectively;The upper cavity is divided into reforming hydrogen chamber and collection chamber by annular partition plate, and the reforming hydrogen chamber is communicated with collection chamber, and the collection chamber is communicated with hydrogen collection system, for collecting hydrogen;The reforming hydrogen chamber is coated with methanol reforming catalyst.

[0008] Further, the heat exchange passage is two-layer spiral disc-shaped heat exchange passage, and is methanol vapor spiral passage and exhaust gas spiral passage respectively;The channel section of the methanol vapor spiral passage and the exhaust gas spiral passage is rectangular respectively;Exhaust gas delivery system is communicated with one end of exhaust gas spiral passage, and methanol aqueous solution delivery system is communicated with one end of methanol vapor spiral passage;The other end of the methanol vapor spiral passage is communicated with reforming hydrogen chamber by fluid guiding unit;The other end of the exhaust gas spiral passage is communicated with exhaust gas outlet.

[0009] Further, the fluid guiding unit includes horizontal curved pipeline and vertical pipeline, the horizontal curved pipeline is curved tapered pipeline, one end of the horizontal curved pipeline is communicated with the other end of the methanol vapor spiral passage, and the other end of the horizontal curved pipeline is communicated with the vertical pipeline;The vertical pipeline is communicated with the center of the reforming hydrogen chamber.

[0010] Further, the reforming hydrogen chamber is equipped with first boss array area and second boss array area, the first boss array area is located in the center of the reforming hydrogen chamber, and the outlet of the fluid guiding unit is located in the first boss array area;At least one circle of first elliptical bosses distributed along circumference is arranged along the radial direction in the first boss array area, and the major axis of the first elliptical boss in the first boss array area is arranged along the radial direction;At least one circle of fusiform boss units distributed along circumference is arranged along the radial direction in the second boss array area;Each fusiform boss unit is composed of four second elliptical bosses to form fusiform, and gap is arranged between adjacent second elliptical bosses in each fusiform boss unit;The surface of the first elliptical boss and the second elliptical boss is coated with methanol reforming catalyst respectively.

[0011] Further, two circles of first elliptical bosses distributed along circumference are arranged along the radial direction in the first boss array area;The number of the second circle of first elliptical bosses distributed along circumference is twice the number of the first circle of first elliptical bosses distributed along circumference;The second circle of first elliptical bosses distributed along circumference and the first circle of first elliptical bosses distributed along circumference are staggered.

[0012] Further, the long axis direction of the second elliptical boss in each shuttle boss unit is 30°-60° to the radial direction of the hydrogen reforming chamber, the length of the long axis of the second elliptical boss in the shuttle boss unit increases with the increase of the diameter of the distribution circle, and the height of the second elliptical boss decreases with the increase of the diameter of the distribution circle.

[0013] Further, the methanol aqueous solution delivery system comprises a methanol aqueous solution pump, a methanol supply control electromagnetic valve and a methanol aqueous solution storage tank, the methanol aqueous solution storage tank is communicated with the methanol vapor spiral channel through the methanol aqueous solution pump and the methanol supply control electromagnetic valve; the exhaust delivery system is provided with a gas supply control electromagnetic valve for communicating the exhaust of the internal combustion engine with the exhaust spiral channel; the hydrogen outlet of the collection chamber is provided with a hydrogen production monitoring device for detecting the hydrogen flow.

[0014] A control strategy of a methanol reforming hydrogen production device using high-temperature gas heat supply, comprising the following steps:

[0015] According to the injected fuel mass m, the required hydrogen mass M is determined 氢 =m×p%, p% is the hydrogen mixing ratio of the internal combustion engine; according to the hydrogen mass, the mass M of the methanol aqueous solution is determined 甲水 ;

[0016] The methanol aqueous solution reaches t w The heat required for absorption is Q1=C 溶液 M 甲水 (t w -t s ), wherein C 溶液 is the specific heat capacity of the methanol aqueous solution; t s is the initial temperature; t w is the reaction temperature of the methanol aqueous solution;

[0017] The volume of the exhaust gas is V 尾气 , and the maximum heat generated by the exhaust gas is Q2=C 尾气 V 尾气 ρ 尾气 (t i -t o ), wherein: C 尾气 is the specific heat capacity of the exhaust gas, ρ 尾气 is the density of the exhaust gas; t i is the temperature of the exhaust gas spiral channel inlet, and t o is the temperature of the exhaust gas spiral channel outlet;

[0018] When t i >t sQ2 / K > Q1, the exhaust gas control solenoid valve is reduced to make Q'2 = KQ1, where K is the heat loss coefficient of the two-layer spiral disc heat exchange channel; Q'2 is the heat generated by the exhaust gas after adjusting the exhaust gas control solenoid valve opening;

[0019] If 0.95Q1≤Q2 / K≤Q1, the flow of the methanol aqueous solution is reduced to make Q'1 = Q2 / K, where Q'1 is the heat generated by the exhaust gas after adjusting the exhaust gas control solenoid valve opening; w The heat required to be absorbed;

[0020] If Q2 / K < 0.95Q1, only the exhaust gas delivery system is controlled to preheat the methanol vapor spiral channel.

[0021] Further, the flow of the methanol aqueous solution is reduced in particular as follows:

[0022] The time required for the methanol aqueous solution to exchange heat is Where λ is the heat flux density, and S is the total heat exchange area of the heat exchange channel;

[0023] The length of the heat exchange channel is L, and the flow rate of the methanol aqueous solution is The output flow rate υ of the methanol aqueous solution pump is determined 溶液 The power of the methanol aqueous solution pump is reduced or the temperature t o of the exhaust gas spiral channel outlet is changed to reduce the flow of the methanol aqueous solution.

[0024] A control strategy for a methanol reforming hydrogen production device using high-temperature gas heating, comprising the following steps:

[0025] The heat Q3 required to be absorbed by the methanol aqueous solution when the methanol supply control solenoid valve is fully open is determined as follows: 溶液 qv 溶液 ρ 溶液 (t w -t s );

[0026] The heat Q2 lost by the exhaust gas when the exhaust gas control solenoid valve is fully open is determined as follows: 尾气 qv 尾气 ρ 尾气 (t i -t o ), where qv 溶液 is the flow of the methanol aqueous solution;

[0027] When t i > t w , if Q2 / K > 1.3Q3, the exhaust gas control solenoid valve is reduced to make Q2 = KQ3, where K is the heat loss coefficient of the two-layer spiral disc heat exchange channel; Q'2 is the heat generated by the exhaust gas after adjusting the exhaust gas control solenoid valve opening;

[0028] If Q3 < Q2 / K ≤ 1.3Q3, then by increasing the flow of the methanol aqueous solution, Q'3 = Q2 / K, wherein Q'3 is the flow of the methanol aqueous solution after adjustment to reach t w Heat to be absorbed;

[0029] If 0.7Q3 ≤ Q2 / K ≤ Q3, then by decreasing the flow of the methanol aqueous solution, Q'3 = Q2 / K;

[0030] If 0.7Q3 > Q2 / K, only the exhaust gas delivery system is controlled to preheat the methanol vapor spiral channel.

[0031] The present application has the following advantages:

[0032] 1. The present application utilizes a high-temperature gas heating methanol reforming hydrogen production device and control strategy, and a high-temperature gas heating methanol reforming hydrogen production device, and a spiral disc-shaped heat exchanger to fully utilize the energy of the high-temperature gas to heat and evaporate the methanol aqueous solution into gas, thereby improving the energy utilization efficiency.

[0033] 2. The present application utilizes a high-temperature gas heating methanol reforming hydrogen production device and control strategy, and a first array of protrusions and a second array of protrusions are arranged in the reforming hydrogen production chamber, the first array of protrusions is located at the center of the reforming hydrogen production chamber, and the outlet of the fluid guiding unit is located in the first array of protrusions; at least one circle of first elliptical protrusions is arranged in the first array of protrusions in the radial direction, and the long axis of the first elliptical protrusions is arranged in the radial direction, which can effectively uniformly disperse the gas entering the reforming hydrogen production chamber, increase the specific surface area of the reactor, and improve the reaction rate.

[0034] 3. The present application utilizes a high-temperature gas heating methanol reforming hydrogen production device and control strategy, and a double-layer disc-shaped structure is adopted, which occupies a small space and is easy to install; a spiral disc-shaped heat exchanger is used, which has low cost and improves the heat and mass transfer performance, and has a wide application range.

[0035] 4. The present application utilizes a control strategy of a high-temperature gas heating methanol reforming hydrogen production device, and provides two control methods, which are respectively based on the preset hydrogen mixing ratio of the internal combustion engine and whether the internal combustion engine is detonated, and by controlling the opening and closing states of the exhaust gas control solenoid valve and the methanol supply control solenoid valve in different degrees, the methanol reforming hydrogen production device can change the working condition according to the working state of the internal combustion engine, thereby expanding the working range. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the description of the embodiments or the prior art. The drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0037] Figure 1 The cross-sectional view of the methanol reforming hydrogen production device using high-temperature gas heat supply according to the present application.

[0038] Figure 2 The schematic diagram of the boss arrangement in the reforming hydrogen production inner chamber according to the present application.

[0039] Figure 3 The schematic diagram of the reforming hydrogen production chamber and hydrogen collection chamber structure according to the present application.

[0040] Figure 4 The schematic diagram of the fluid conduction unit structure according to the present application.

[0041] Figure 5 The schematic diagram of the heat exchange channel, sealing base and fluid conduction unit assembly structure according to the present application.

[0042] Figure 6 The schematic diagram of the fluid flow path according to the present application.

[0043] Figure 7 The logic judgment diagram of the control strategy one according to the present application.

[0044] Figure 8 The logic judgment diagram of the control strategy two according to the present application.

[0045] In the drawings:

[0046] 1-sealing cover; 2-reforming hydrogen production chamber; 2-1-first elliptical boss; 2-2-second elliptical boss; 3-collection chamber; 4-fluid conduction unit; 5-heat exchange channel; 6-tail gas inlet; 7-methanol aqueous solution inlet; 8-sealing base; 9-hydrogen outlet; 10-tail gas outlet; 11-tail gas control electromagnetic valve; 12-methanol supply control electromagnetic valve; 13-methanol aqueous solution pump; 14-methanol aqueous solution storage tank; 15-tail gas discharge pipe; 16-hydrogen production monitoring device. DETAILED DESCRIPTION

[0047] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0048] In the description of the present application, it is to be understood by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0049] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] As shown in Figure 1 The methanol reforming hydrogen production device using high-temperature gas heating according to the present application comprises a shell, a heat exchange channel 5 and a reforming hydrogen production chamber 2; the shell comprises a sealing cover 1, a shell body and a sealing base 8; the sealing cover 1, the shell body and the sealing base 8 are coaxially connected in a stacked manner from top to bottom, that is, the bottom of the shell body is connected with the sealing base 8, and the sealing cover 1 is connected with the upper part of the shell body; sealing gaskets are respectively arranged between the bottom of the shell body and the sealing base 8 and between the sealing cover 1 and the upper part of the shell body; a lower cavity is arranged between the bottom of the shell body and the sealing base 8, and an upper cavity is arranged between the sealing cover 1 and the upper part of the shell body; the heat exchange channel 5 is arranged in the lower cavity, and the outlet of the heat exchange channel 5 is communicated with the upper cavity through a fluid guiding unit 4; the inlet of the heat exchange channel 5 is communicated with a tail gas conveying system and a methanol aqueous solution conveying system respectively; the upper cavity is divided into the reforming hydrogen production chamber 2 and a collection chamber 3 by an annular partition plate; the reforming hydrogen production chamber 2 is communicated with the collection chamber 3, the collection chamber 3 is communicated with a hydrogen collecting system for collecting hydrogen, and the reforming hydrogen production chamber 2 is coated with a methanol reforming catalyst.

[0051] As shown in Figure 5As shown in the figure, the heat exchange channel 5 is a two-layer spiral disc-shaped heat exchange channel, which is a methanol vapor spiral channel and a tail gas spiral channel respectively, and the channel cross section is rectangular; the channel cross section of the methanol vapor spiral channel and the tail gas spiral channel is rectangular respectively; the tail gas conveying system is communicated with the tail gas inlet 7 at one end of the tail gas spiral channel, and the methanol aqueous solution conveying system is communicated with the methanol aqueous solution inlet 6 at one end of the methanol vapor spiral channel; the other end of the methanol vapor spiral channel is communicated with the hydrogen reforming chamber 2 through the fluid guiding unit 4; the other end of the tail gas spiral channel is communicated with the tail gas outlet 10. The tail gas outlet 10 is located on the sealing base 8.

[0052] As shown in the figure, Figure 4 The fluid guiding unit 4 is a curved hollow pipe, which includes a horizontal curved pipe and a vertical pipe, the horizontal curved pipe is a curved tapered pipe, one end of the horizontal curved pipe is communicated with the other end of the methanol vapor spiral channel, and the other end of the horizontal curved pipe is communicated with the vertical pipe; the vertical pipe is communicated with the center of the hydrogen reforming chamber 2.

[0053] As shown in the figure, Figure 2 And Figure 3 As shown in the figure, the first boss array area and the second boss array area are arranged in the hydrogen reforming chamber 2, the first boss array area is located in the center of the hydrogen reforming chamber 2, and the outlet of the fluid guiding unit 4 is located in the first boss array area; at least one circle of first elliptical bosses 2-1 distributed along the circumference is arranged in the first boss array area along the radial direction, and the long axis of the first elliptical boss 2-1 in the first boss array area is arranged along the radial direction; at least one circle of fusiform boss units distributed along the circumference is arranged in the second boss array area along the radial direction; each fusiform boss unit is composed of four second elliptical bosses 2-2 to form a fusiform, and a gap is arranged between adjacent second elliptical bosses 2-2 in each fusiform boss unit; the surfaces of the first elliptical boss 2-1 and the second elliptical boss 2-2 are respectively coated with a methanol reforming catalyst. The methanol reforming catalyst is a Ce / Cu-ZnO / Al2O3 copper-based catalyst; the first boss array area and the second boss array area in the hydrogen reforming chamber 2 can effectively uniformly disperse the gas entering the hydrogen reforming chamber, increase the specific surface area of the reactor, and improve the reaction rate.

[0054] In the embodiment, two circles of first elliptical bosses 2-1 distributed along the circumference are arranged in the first boss array area along the radial direction; the number of the second circle of first elliptical bosses 2-1 distributed along the circumference is twice the number of the first circle of first elliptical bosses 2-1 distributed along the circumference, and the second circle of first elliptical bosses 2-1 is staggered with the first circle of first elliptical bosses 2-1. Figure 2 As can be seen in the figure, one first elliptical boss 2-1 of the first circle is arranged at the phase angle between the two first elliptical bosses 2-1 of the second circle.

[0055] In the embodiment, the long axis direction of the second elliptical boss 2-2 in each shuttle boss unit is 30-60 degrees with the radial direction of the hydrogen reforming chamber 2, the length of the long axis of the second elliptical boss 2-2 in the shuttle boss unit increases with the increase of the diameter of the distribution circumference, and the height of the second elliptical boss 2-2 decreases with the increase of the diameter of the distribution circumference.

[0056] The methanol aqueous solution conveying system comprises a methanol aqueous solution pump 13, a methanol supply control electromagnetic valve 12 and a methanol aqueous solution storage tank 14, which is communicated with the methanol vapor spiral channel through the methanol aqueous solution pump 13 and the methanol supply control electromagnetic valve 12; the tail gas conveying system is provided with a gas supply control electromagnetic valve 11 for communicating the internal combustion engine tail gas with the tail gas spiral channel; the hydrogen outlet 9 of the collection chamber 3 is provided with a hydrogen production monitoring device 16 for detecting the hydrogen flow.

[0057] The methanol aqueous solution conveying system comprises a methanol aqueous solution pump 13, a methanol supply control electromagnetic valve 12 and a methanol aqueous solution storage tank 14, which is communicated with the methanol vapor spiral channel through the methanol aqueous solution pump 13 and the methanol supply control electromagnetic valve 12; the tail gas conveying system is provided with a gas supply control electromagnetic valve 11 for communicating the internal combustion engine tail gas with the tail gas spiral channel; the hydrogen outlet 9 of the collection chamber 3 is provided with a hydrogen production monitoring device 16 for detecting the hydrogen flow.

[0058] As shown in the fluid flow path schematic diagram of the present application, Figure 6 As shown in the fluid flow path schematic diagram of the present application,

[0059] By adding the methanol supply control electromagnetic valve 12 and the gas supply control electromagnetic valve 11 on the pipeline connected with the methanol aqueous solution inlet 6 and the tail gas inlet 7, the device can change the working condition and control the conveying of the methanol aqueous solution and the tail gas to ensure the normal operation of the device.

[0060] A control strategy of a methanol reforming hydrogen production device using high-temperature gas heating, the specific steps are as follows:

[0061] S01: first open the exhaust control solenoid valve 11, the appropriate amount of exhaust gas into the heat exchange passage 5 in the exhaust gas passage, preheating the passage, reach the preset temperature, open the methanol supply control solenoid valve 12, methanol solution pump 13, the methanol solution into the heat exchange passage 5 in the methanol vapor passage, according to the display parameters of hydrogen production monitoring device 16, record the reaction temperature, hydrogen content, record the reaction temperature, adjust the degree of opening of exhaust control solenoid valve 11, the best temperature is obtained;

[0062] S02: adjust the working condition, under the condition that the exhaust gas temperature of exhaust gas inlet 6 is higher than the optimum reaction temperature, the present application has two kinds of adjusting working condition methods;

[0063] As shown in Figure 7 , the first adjusting method: according to the preset hydrogen-doped ratio of internal combustion engine, determine the heat required by methanol solution; Determine the hydrogen-doped ratio of internal combustion engine, the mass of methanol solution and the heat required by methanol solution can be determined. When the heat supplied by exhaust gas exceeds the heat required by methanol vapor to reach the optimum reaction temperature, reduce the degree of opening of exhaust control solenoid valve 11; When the heat supplied by exhaust gas is within the range of 95% to 100% of the heat required by methanol vapor to reach the optimum reaction temperature, methanol solution pump 13 will be reduced to the appropriate power; When the heat supplied by exhaust gas is less than 95% of the heat required by methanol vapor to reach the optimum reaction temperature, methanol supply control solenoid valve 12 is completely closed, methanol solution pump 13 stops working, exhaust control solenoid valve 11 is completely opened, and the temperature of methanol reforming hydrogen production device is maintained; In the above case, if the knock sensor 17 receives a knock signal, reduce the opening degree of exhaust control solenoid valve 11 to 90%, reduce the power of methanol solution pump 13 to 90%, then reduce the content of exhaust gas and methanol solution to 90% of the original;

[0064] Specifically:

[0065] According to the mass of injected fuel m, determine the mass of hydrogen M required 氢 =m×p%, p% is the hydrogen-doped ratio of internal combustion engine; According to the mass of hydrogen, determine the mass of methanol solution M 甲水 ;

[0066] The methanol solution reaches t w , the heat required to be absorbed is Q1=C 溶液 M 甲水 (t w -t s ), wherein C 溶液 is the specific heat capacity of methanol solution; t s is the initial temperature; t w is the reaction temperature of methanol solution;

[0067] The volume of exhaust gas is V尾气 Then the maximum heat generated by the exhaust gas is Q2 = C 尾气 V 尾气 ρ 尾气 (t i -t o ), where: C 尾气 ρ is the specific heat capacity of the exhaust gas. 尾气 The density of the exhaust gas; t i t represents the temperature at the inlet of the exhaust spiral channel. o The temperature at the outlet of the exhaust spiral channel;

[0068] When t i >t s In case 1: If Q2 / K > Q1, then by reducing the opening of the exhaust gas control solenoid valve 11, Q′2 = KQ1, where K is the heat loss coefficient of the two-layer spiral disc heat exchange channel; Q′2 is the heat generated by the exhaust gas after adjusting the opening of the exhaust gas control solenoid valve 11.

[0069] Case 2: If 0.95Q1≤Q2 / K≤Q1, then by reducing the flow rate of the methanol-water solution, Q′1=Q2 / K can be achieved, where Q′1 is the value at which the flow rate of the methanol-water solution reaches t. w The amount of heat that needs to be absorbed; specifically, reducing the flow rate of the methanol-water solution is as follows:

[0070] The heat exchange time required to obtain the methanol-water solution is Where λ is the heat flux density and S is the total heat exchange area of ​​the heat exchange channels;

[0071] The length of the heat exchange channel is L, and the flow rate of the methanol-water solution is... Determine the output flow rate υ of methanol-water solution pump 13 溶液 The power can be reduced by decreasing the power of the methanol-water solution pump 13 or by changing the temperature t at the outlet of the exhaust gas spiral channel. o This reduces the flow rate of the methanol-water solution.

[0072] Case 3: If Q2 / K < 0.95Q1, then only the preheating of the methanol vapor spiral channel in the exhaust gas delivery system is controlled.

[0073] Scenario 4: If the internal combustion engine knock sensor receives a knock signal, the content of exhaust gas and methanol-water solution entering the device will be reduced to 90% of the original level.

[0074] like Figure 8The second adjusting method is shown in the figure. The heat absorbed by the methanol solution when the methanol supply control electromagnetic valve 12 is fully opened and the heat lost by the exhaust gas when the exhaust gas control electromagnetic valve 11 is fully opened are used as the basis. When the heat supplied by the exhaust gas exceeds 130% of the heat required by the methanol vapor to reach the optimal reaction temperature, the degree of opening of the exhaust gas control electromagnetic valve 11 is reduced. When the heat supplied by the exhaust gas is within the range of 100% to 130% of the heat required by the methanol vapor to reach the optimal reaction temperature, the methanol supply control electromagnetic valve 12 is fully opened and the methanol solution pump 13 is increased to the appropriate power. When the heat supplied by the exhaust gas is within the range of 70% to 100% of the heat required by the methanol vapor to reach the optimal reaction temperature, the exhaust gas control electromagnetic valve 11 is fully opened and the methanol solution pump 13 is reduced to the appropriate power. When the heat supplied by the exhaust gas is less than 70% of the heat required by the methanol vapor to reach the optimal reaction temperature, the methanol supply control electromagnetic valve 12 is fully closed, the methanol solution pump 13 is no longer working, and the exhaust gas control electromagnetic valve 11 is fully opened to maintain the temperature of the methanol reforming hydrogen production device. In the above cases, if the knock sensor 17 receives a knock signal, the degree of opening of the exhaust gas control electromagnetic valve 11 is reduced to 90% and the power of the methanol solution pump 13 is reduced to 90%, which reduces the content of the exhaust gas and the methanol solution to 90% of the original.

[0075] Specifically, the method comprises the following steps:

[0076] Determine the heat Q3 required by the methanol solution when the methanol supply control electromagnetic valve 12 is fully opened, which is C 溶液 qv 溶液 ρ 溶液 (t w -t s );

[0077] Determine the heat Q2 lost by the exhaust gas when the exhaust gas control electromagnetic valve 11 is fully opened, which is C 尾气 qv 尾气 ρ 尾气 (t i -t o ), where qv 溶液 is the flow rate of the methanol solution.

[0078] When t i > t w , case one: if Q2 / K > 1.3Q3, reduce the opening degree of the exhaust gas control electromagnetic valve 11 so that Q'2 = KQ3, where K is the heat loss coefficient of the two-layer spiral disc-shaped heat exchange channel; Q'2 is the heat generated by the exhaust gas after adjusting the opening degree of the exhaust gas control electromagnetic valve 11.

[0079] Case two: if Q3 < Q2 / K ≤ 1.3Q3, increase the flow rate of the methanol solution so that Q'3 = Q2 / K, where Q'3 is the heat absorbed by the methanol solution after adjusting the flow rate of the methanol solution to reach tw heat to be absorbed;

[0080] Case three: if 0.7Q3≤Q2 / K≤Q3, then by reducing the flow of methanol water solution, Q'3=Q2 / K;

[0081] Case four: if 0.7Q3>Q2 / K, then only control the exhaust gas delivery system to preheat the methanol steam spiral channel.

[0082] Case five: in the second adjustment method, if the knock sensor of the internal combustion engine receives a knock signal in case one, two, and three, then the contents of the exhaust gas and the methanol water solution are reduced to 90% of the original;

[0083] In the second adjustment method, in the case two and case three, by changing the power of the methanol water solution pump 13 to change qv 溶液 , and then change Q'3, the specific method is:

[0084] The time required for heat exchange of the methanol water solution is where λ is the heat flux density, S is the total heat exchange area of the heat exchange channel; the length through the heat exchange channel is L, and the flow rate of the methanol water solution is The power of the methanol water solution pump 13 output flow rate υ 溶液 is determined, by changing the actual working power of the methanol water solution pump 13 or changing the temperature t o of the exhaust gas spiral channel outlet, to change the flow of the methanol water solution.

[0085] The control strategy of the methanol reforming hydrogen production device using high-temperature gas heating by the system ECU changes the working conditions of the exhaust gas control solenoid valve 11, the methanol supply control solenoid valve 12, and the methanol water solution pump 13, so that the temperature of the methanol water solution reaches t w when it enters the fluid guiding unit 4.

[0086] It should be understood that although the present specification is described in terms of various embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

[0087] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present application, and are not intended to limit the protection scope of the present application, and any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A methanol reforming hydrogen production apparatus utilizing high-temperature gas heating, characterized in that, The system includes a shell, a heat exchange channel (5), and a reforming hydrogen production chamber (2). The shell has two cavities, an upper and a lower cavity. The lower cavity contains the heat exchange channel (5), and the outlet of the heat exchange channel (5) is connected to the upper cavity through a fluid guiding unit (4). The inlet of the heat exchange channel (5) is connected to the tail gas delivery system and the methanol-water solution delivery system, respectively. The upper cavity is divided into a reforming hydrogen production chamber (2) and a collection chamber (3) by an annular partition plate. The reforming hydrogen production chamber (2) is connected to the collection chamber (3), and the collection chamber (3) is connected to the hydrogen collection system for collecting hydrogen. The heat exchange channel (5) is a two-layer spiral disc heat exchange channel, namely a methanol vapor spiral channel and a tail gas spiral channel; the cross-sections of the methanol vapor spiral channel and the tail gas spiral channel are rectangular; the tail gas conveying system is connected to one end of the tail gas spiral channel, and the methanol aqueous solution conveying system is connected to one end of the methanol vapor spiral channel; the other end of the methanol vapor spiral channel is connected to the reforming hydrogen production chamber (2) through the fluid guiding unit (4); the other end of the tail gas spiral channel is connected to the tail gas outlet (10); the reforming hydrogen production chamber (2) is provided with a first protrusion array area and a second protrusion array area, the first protrusion array... The column area is located at the center of the reforming hydrogen production chamber (2), and the outlet of the fluid guiding unit (4) is located in the first protrusion array area; the first protrusion array area is provided with at least one ring of first elliptical protrusions distributed circumferentially along the radial direction, and the major axis of the first elliptical protrusions in the first protrusion array area is arranged along the radial direction; the second protrusion array area is provided with at least one ring of spindle-shaped protrusion units distributed circumferentially along the radial direction; each spindle-shaped protrusion unit is composed of 4 second elliptical protrusions forming a spindle shape, and there is a gap between adjacent second elliptical protrusions in each spindle-shaped protrusion unit; the surfaces of the first elliptical protrusions and the second elliptical protrusions are respectively coated with methanol reforming catalyst.

2. The methanol reforming hydrogen production apparatus utilizing high-temperature gas heating according to claim 1, characterized in that, The fluid guiding unit (4) includes a horizontal curved pipe and a vertical pipe. The horizontal curved pipe is a curved tapering pipe. One end of the horizontal curved pipe is connected to the other end of the methanol vapor spiral channel, and the other end of the horizontal curved pipe is connected to the vertical pipe. The vertical pipe is connected to the center of the reforming hydrogen production chamber (2).

3. The methanol reforming hydrogen production apparatus utilizing high-temperature gas heating according to claim 1, characterized in that, The first protrusion array area has two concentric rings of first elliptical protrusions arranged radially and circumferentially; the number of the second concentric ring of first elliptical protrusions is twice the number of the first concentric ring of first elliptical protrusions; the second concentric ring of first elliptical protrusions and the first concentric ring of first elliptical protrusions are arranged alternately.

4. The methanol reforming hydrogen production apparatus utilizing high-temperature gas heating according to claim 1, characterized in that, The major axis of the second elliptical boss in each spindle-shaped boss unit is at an angle of 30° to 60° to the radial direction of the reforming hydrogen production chamber (2). The length of the major axis of the second elliptical boss in the spindle-shaped boss unit increases with the increase of the diameter of the circumference in which it is located, and the height of the second elliptical boss decreases with the increase of the diameter of the circumference in which it is located.

5. The methanol reforming hydrogen production apparatus utilizing high-temperature gas heating according to claim 1, characterized in that, The methanol-water solution delivery system includes a methanol-water solution pump (13), a methanol supply control solenoid valve (12), and a methanol-water solution storage tank (14). The methanol-water solution storage tank (14) is connected to the methanol vapor spiral channel through the methanol-water solution pump (13) and the methanol supply control solenoid valve (12). The exhaust gas delivery system is equipped with a gas supply control solenoid valve (11) to connect the exhaust gas of the internal combustion engine with the exhaust gas spiral channel. A hydrogen production monitoring device (16) is installed on the hydrogen outlet (9) of the collection chamber (3) to detect the hydrogen flow rate.

6. A control strategy for a methanol reforming hydrogen production unit utilizing high-temperature gas heating according to claim 1, characterized in that, Includes the following steps: Based on the mass of injected fuel Determine the required mass of hydrogen. p% represents the hydrogen blending ratio in the internal combustion engine; the mass of the methanol-water solution is determined based on the mass of hydrogen. ; methanol aqueous solution reaches The amount of heat that needs to be absorbed is ,in is the specific heat capacity of the methanol-water solution; The initial temperature; The reaction temperature of the methanol-water solution; The volume of exhaust gas emitted is The maximum heat generated by the exhaust gas is ,in: The specific heat capacity of the exhaust gas. This refers to the density of the exhaust gas. The temperature at the inlet of the exhaust spiral channel. The temperature at the outlet of the exhaust spiral channel; when At that time, if Then, by reducing the opening of the exhaust gas control solenoid valve (11), , where K is the heat loss coefficient of the two-layer spiral disk-shaped heat exchange channel; The heat generated by the exhaust gas after adjusting the opening of the exhaust gas control solenoid valve (11); like Then, by reducing the flow rate of the methanol-water solution, ,in To reduce the flow rate of the methanol-water solution to achieve The amount of heat that needs to be absorbed; like Then only the preheating methanol vapor spiral channel of the exhaust gas conveying system is controlled.

7. The control strategy for a methanol reforming hydrogen production unit utilizing high-temperature gas heating according to claim 6, characterized in that, The specific steps to reduce the flow rate of the methanol-water solution are as follows: The heat exchange time required to obtain the methanol-water solution is ,in For heat flux density, This represents the total heat exchange area of ​​the heat exchange channels. The length of the heat exchange channel is The flow rate of the methanol-water solution is Determine the output flow rate of the methanol-water solution pump (13). The power can be reduced by decreasing the power of the methanol-water solution pump (13) or by changing the temperature at the outlet of the exhaust gas spiral channel. This reduces the flow rate of the methanol-water solution.

8. A control strategy for a methanol reforming hydrogen production unit utilizing high-temperature gas heating according to claim 1, characterized in that, Includes the following steps: Determine the amount of heat required to absorb by the methanol-water solution when the methanol supply control solenoid valve (12) is fully open. ; Determine the heat loss of the exhaust gas when the exhaust gas control solenoid valve (11) is fully open. ,in The flow rate of the methanol-water solution; when At that time, if Then, by reducing the opening of the exhaust gas control solenoid valve (11), , where K is the heat loss coefficient of the two-layer spiral disk-shaped heat exchange channel; The heat generated by the exhaust gas after adjusting the opening of the exhaust gas control solenoid valve (11); like Then, by increasing the flow rate of the methanol-water solution, ,in To achieve the desired result after adjusting the flow rate of the methanol-water solution The amount of heat that needs to be absorbed; like Then, by reducing the flow rate of the methanol-water solution, ; like Then only the preheating methanol vapor spiral channel of the exhaust gas conveying system is controlled.

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