JP3925244B2 - Drain water reformer and drain water reformer for engine driven air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention, ExhaustThe present invention relates to a drain water reformer that reforms drain water generated in an exhaust system that exhausts gas.
[0002]
[Prior art]
Conventionally, what was described in Unexamined-Japanese-Patent No. 2000-213341 is disclosed as a drain water reformer of this kind of engine drive type air conditioner. This publication includes a drain water reformer configured to neutralize and discharge drain water, which is generally acidic water, generated in an exhaust system that exhausts exhaust gas from an engine before being discharged to the atmosphere.
[0003]
The drain water reformer includes a drain inlet that communicates with an exhaust system, a drain outlet that communicates with the atmosphere, and a drain passage that snakes up and down and is formed between the drain inlet and the drain outlet. And the counter pressure which opposes the exhaust gas pressure received in a drain inlet_port | entrance is generated with the drain water in this drain flow path. As a result, the exhaust gas entering the drain water reformer is pushed back to the opposing pressure and cannot reach the drain outlet.
[0004]
In addition, the meandering drain passage is covered with calcium carbonate as a neutralizing agent, and the drainage water is brought into contact with the calcium carbonate to neutralize the acidic drainage water and then discharge to the outside. It is like that.
[0005]
[Problems to be solved by the invention]
However, the drain water reformer having the above configuration is pushed back to the opposing pressure and cannot reach the drain outlet, so that the exhaust gas is difficult to be discharged to the drain outlet. It is also necessary to increase the filling frequency of the neutralizing agent as much as possible and increase the contact time between the drain water and the neutralizing agent. For this reason, the drain channel is desired to be as long as possible. However, if the drain channel is lengthened, there is a problem that the drain water reformer is generally increased in size.
[0006]
Therefore, an object of the present invention is to take the above-mentioned points into consideration, and in the drain water, Mg²⁺Providing a drain water reformer for an engine-driven air conditioner that can reduce the size of the drain water reformer while neutralizing or reforming the drain water by arranging a metal member that dissolves ions To do.
[0007]
[Means for Solving the Problems]
  the abovethe purposeIn order to achieveClaim 3The technical means described in is adopted. That is, in the invention described in claim 1, the compressor (11) driven by the engine (20), the outdoor heat exchanger (12), the expansion valve (13), and the indoor heat exchanger (14) are made of refrigerant piping. The refrigeration circuit (10) that is connected, the exhaust system (30) that exhausts the exhaust gas of the engine (20), and the drain water generated in the exhaust system (30) is neutralized or alkalinized and discharged. A drain water reformer of an engine driven air conditioner comprising a drain water reformer (40),
  The drain water reformer (40) has a reforming tank (41) for circulating drain water and a plurality of metal members (42, 43, 44) made of a magnesium material, and a plurality of metal members (42, 43). 44) to drain water with Mg²⁺The drain water in the reforming tank (41) is modified to be neutral or alkaline by dissolving ions.In things,
  The exhaust system (30) is provided with exhaust members (32, 33) made of stainless steel, and electrically connects a plurality of metal members (42, 43, 44) to the exhaust members (32, 33). The reformer (40) generates a standard electrode potential difference between the plurality of metal members (42, 43, 44) and the exhaust member (32, 33), and from the plurality of metal members (42, 43, 44). Mg in drain water ²⁺ The drain water in the reforming tank (41) is modified to be neutral or alkaline by dissolving ions.It is characterized by that.
[0008]
According to the first aspect of the present invention, when the exhaust gas exhausted from the engine (20) is cooled by the exhaust system (30), the acidic component vapor or the oil vapor caused by NOx and SOx in the exhaust gas is produced. It is condensed to become acidic drain water of about PH3 containing oil. When a metal member (42, 43, 44) made of a magnesium material is immersed in this drain water, Mg metal is drained from this metal member (42, 43, 44) into the drain water.²⁺Ions dissolve.
[0009]
Mg in drain water²⁺When ions dissolve, this Mg²⁺Ion reacts with OH- to react with Mg (OH)₂And HNO in drain water_ThreeAnd H₂SO_FourReacts with 3Mg (NO_Three)₂And MgSO_FourIs generated and mixed with the drain water, the drain water having acidity is modified to be neutral or alkaline.
[0010]
Mg²⁺Since the metal members (42, 43, 44) are consumed by dissolving the ions, maintenance is required to replace the metal members (42, 43, 44) periodically. Maintenance frequency can be reduced compared with the conventional method of filling and dissolving calcium).
[0011]
In addition, this magnesium material has active dissolution characteristics in the acidic to neutral range, but in the alkaline range, it becomes stable to produce a non-moving substance, so that the dissolution does not proceed in this region. Therefore, the metal members (42, 43, 44) are not consumed when immersed in drain water modified to be alkaline.
[0012]
Mg²⁺When ions are dissolved, magnesium, which is one of the minerals contained in the water supply, is dissolved, so that it can be directly discharged into the sewer, and there is no concern about environmental pollution.
[0018]
  AlsoThe standard electrode potential difference between the metal of magnesium material and stainless steel material is about 2.0V. If this standard electrode potential difference is applied to make the magnesium material a sacrificial electrode made of stainless steel, the magnesium material will dissolve.it can.
[0019]
Therefore, according to the present invention, by electrically connecting the metal members (42, 43, 44) to the exhaust members (32, 33), corrosion prevention of the stainless steel can be performed, and from the metal members (42, 43, 44). Mg in drain water²⁺Ions can be dissolved.
[0020]
  Claim 2In the invention described in (4), the opening / closing means (46) for opening and closing the electrical connection between the metal member (42, 43, 44) and the exhaust member (32, 33) includes the metal member (42, 43, 44) and the exhaust. The drain water reformer (40) provided between the members (32, 33) is characterized in that it opens and closes the opening / closing means (46) when the engine (20) is operating. Yes.
[0021]
  Claim 2According to the present invention, the opening / closing means (46) for opening and closing the electrical connection between the metal member (42, 43, 44) and the exhaust member (32, 33) is provided, and the engine (20) is operated. When the opening / closing means (46) is made conductive, the drain water generated from the operating engine (20) can be easily modified, and the structure is simpler than the electrolysis method. A drain water reformer is made.
  In the third aspect of the invention, the exhaust system (30) for exhausting the exhaust gas containing acidic components and burned in the combustion chamber, and the drain water generated in the exhaust system (30) are made neutral or alkaline. A drain water reformer comprising a drain water reformer (40) for reforming and discharging,
  The drain water reformer (40) has a reforming tank (41) for circulating drain water and a plurality of metal members (42, 43, 44) made of a magnesium material, and a plurality of metal members (42, 43). 44) to drain water with Mg ²⁺ In what is constituted so as to modify the drain water in the reforming tank (41) to neutral or alkaline by dissolving ions,
  The exhaust system (30) is provided with exhaust members (32, 33) made of stainless steel, and electrically connects a plurality of metal members (42, 43, 44) to the exhaust members (32, 33). The reformer (40) generates a standard electrode potential difference between the plurality of metal members (42, 43, 44) and the exhaust member (32, 33), and from the plurality of metal members (42, 43, 44). Mg in drain water ²⁺ A feature is that the drain water in the reforming tank (41) is modified to be neutral or alkaline by dissolving ions.
  Claim 3According to the invention described above, when the exhaust gas containing an acidic component is cooled in the exhaust system (30), the vapor of the acidic component in the exhaust gas is condensed to become acidic drain water. When a metal member (42, 43, 44) made of a magnesium material is immersed in this drain water, Mg metal is drained from this metal member (42, 43, 44) into the drain water.²⁺Ions dissolve. Mg in drain water²⁺When ions dissolve, this Mg²⁺The ions react with OH- to react with Mg (OH) 2 and HNO3 and H2SO4 contained in the drain water to produce 3Mg (NO3) 2 and MgSO4 and mix with the drain water. Modified to neutral or alkaline.
  Mg²⁺Since the metal members (42, 43, 44) are consumed by dissolving the ions, maintenance is required to replace the metal members (42, 43, 44) periodically. Maintenance frequency can be reduced compared with the conventional method of filling and dissolving calcium).
  In addition, this magnesium material has active dissolution characteristics in the acidic to neutral range, but in the alkaline range, it becomes stable to produce a non-moving substance, so that the dissolution does not proceed in this region. Therefore, the metal members (42, 43, 44) are not consumed when immersed in drain water modified to be alkaline. Mg²⁺When ions are dissolved, magnesium, which is one of the minerals contained in the water supply, is dissolved, so that it can be directly discharged into the sewer, and there is no concern about environmental pollution.
  Further, the standard electrode potential difference between the metal of the magnesium material and the stainless material is about 2.0V. If this standard electrode potential difference is applied to make the magnesium material a sacrificial electrode made of stainless steel, the magnesium material can be dissolved. Therefore, by electrically connecting the metal members (42, 43, 44) to the exhaust members (32, 33), it is possible to prevent corrosion of the stainless steel material, and Mg from the metal members (42, 43, 44) to the drain water. ²⁺ Ions can be dissolved.
[0022]
In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, a first embodiment in which the present invention is applied to an engine-driven air conditioner will be described with reference to FIGS. 1 to 3. First, FIG. 1 is a schematic diagram showing an overall configuration of a drain water reformer of an engine-driven air conditioner in a first embodiment of the present invention.
[0024]
In FIG. 1, an engine-driven air conditioner 100 includes a compressor 11, an outdoor heat exchanger 12, an expansion valve 13, and an indoor heat exchanger 14 connected by a refrigerant pipe 15 and a compressor 11. An engine 20 for driving, an exhaust system 30 for exhausting exhaust gas from the engine 20, and a drain water reformer 40 for reforming and discharging drain water generated in the exhaust system 30 are provided. In addition, this refrigerant | coolant piping 15 is comprised by refrigerant | coolant piping 15a, 15b, 15c, 15d, 15e, 15f in this embodiment.
[0025]
The compressor 11 is connected to the four-way switching valve 16 by a refrigerant pipe 15a. The four-way switching valve 16 is connected to the refrigerant pipes 15b, 15e, and 15f in addition to the refrigerant pipe 15a. Depending on whether the cooling operation or the heating operation is performed, the connection of 15a-15b and 15e-15f (cooling operation) or 15a It can be switched to any one of the connections (heating operation) of -15e and 15b-15f.
[0026]
The refrigerant pipe 15b having one end connected to the four-way switching valve 16 is connected to the outdoor heat exchanger 12 at the other end. The outdoor heat exchanger 12 is further connected to the expansion valve 13 by the refrigerant pipe 15c, the expansion valve 13 is connected to the indoor heat exchanger 14 by the refrigerant pipe 15d, and the indoor heat exchanger 14 is connected to the four-way switching valve 16 by the refrigerant pipe 15e. ing. The refrigerant pipe 15f having one end connected to the four-way switching valve 16 is connected to the compressor 11 via an accumulator (not shown) at the other end.
[0027]
In the above configuration, when the compressor 11 is driven by the engine 20, the refrigerant in the refrigerant pipe 15 circulates in the refrigerant circuit 10. In FIG. 1, the solid line arrows indicate the refrigerant circulation direction during the cooling operation, and the dotted line arrows indicate the refrigerant circulation direction during the heating operation. Hereinafter, the cooling operation will be described by taking cooling as an example. In this case, the four-way switching valve 16 connects the refrigerant pipes 15a-15b and the refrigerant pipe 15e-15f, respectively.
[0028]
The high-pressure gaseous refrigerant discharged by being pressurized by the compressor 11 is introduced into the outdoor heat exchanger 12 through the refrigerant pipe 15a, the four-way switching valve 16, and the refrigerant pipe 15b. In the outdoor heat exchanger 12, the high-pressure gaseous refrigerant releases heat to the outside by the outdoor fan 12a, lowers its own enthalpy, and becomes a gas-liquid two-phase refrigerant. Thus, the refrigerant | coolant which became the gas-liquid two phase passes the expansion valve 13 through the refrigerant | coolant piping 15c, and expand | swells here and is low-pressured. Further, the low-pressure refrigerant is introduced into the indoor heat exchanger 14 through the refrigerant pipe 15d.
[0029]
In the indoor heat exchanger 14, the low-pressure refrigerant absorbs heat from the outside by the indoor fan 14a, raises its own enthalpy, and partially vaporizes. The atmosphere is cooled by the latent heat of vaporization that accompanies this vaporization, and cooling is performed. The refrigerant partially vaporized in the indoor heat exchanger 14 is gas-liquid separated by an accumulator (not shown) through the refrigerant pipe 15e, the four-way switching valve 16, and the refrigerant pipe 15f, and only the gas-phase refrigerant is returned to the compressor 11 again. Return. In this way, the cooling operation is performed.
[0030]
The engine 20 is provided with a cooling water circuit 50. A part of the cooling water circuit 50 passes through the engine 20 to cool the engine 20, and the circulating water 51 circulates the cooling water in the circuit. Further, the cooling water circuit 50 cools the cooling water heated by heat exchange with the engine 20 with a heat exchanger 52 interposed therebetween. Further, an exhaust heat exchanger 32 (described later) is also interposed in the cooling water circuit 50, and plays a role of reducing the exhaust gas temperature by exchanging heat with the exhaust gas from the engine 20.
[0031]
The exhaust system 30 includes an exhaust pipe 31 connected to the engine 20, the above-described exhaust heat exchanger 32 disposed in the middle of the exhaust pipe 31, and a downstream end side (side away from the engine 20) of the exhaust pipe 31. The exhaust muffler 33 is attached. The exhaust pipe 31 communicates with the combustion chamber of the engine 20 and is a pipe for releasing the exhaust gas after being burned in the combustion chamber to the atmosphere. The exhaust heat exchanger 32 is for reducing the exhaust gas temperature by exchanging heat between the high-temperature exhaust gas passing through the exhaust pipe 31 and the engine coolant as described above. The exhaust muffler 33 expands the exhaust gas passage cross-sectional area to reduce exhaust noise.
[0032]
One end of an inlet side drain hose 61 is connected to the exhaust heat exchanger 32 and the exhaust muffler 33. A drain water reformer 40 is connected to the other end of the inlet side drain hose 61. Furthermore, one end of an outlet side drain hose 62 is connected to the drain water reformer 40, and the other end of the outlet side drain hose 62 is open to the atmosphere.
[0033]
The drain water drained to the inlet side drain hose 61, when the exhaust gas is cooled by the exhaust heat exchanger 32 and the exhaust muffler 33, is steam or oil content of acidic components caused by NOx and SOx in the exhaust gas. Steam condenses and becomes acidic drain water of about PH3 containing oil.
[0034]
Next, the structure of the drain water reformer 40 which is the principal part of this invention is demonstrated based on FIG. 2 and FIG. As shown in FIG. 2, the drain water reformer 40 includes a reforming tank 41 that introduces drain water, and first and second electrodes 42 and 43 that are disposed to face the reforming tank 41. The voltage application circuit unit 45 is a voltage application unit that applies a voltage to the first and second electrodes 42 and 43, and a reforming controller 47.
[0035]
Moreover, the inlet 41 a provided in the reforming tank 41 is connected to the inlet side drain hose 61 of the exhaust system 30 to take in drain water, and the outlet 41 b provided in the reforming tank 41 is connected to the outlet side drain hose 62. It is connected and drained. The outlet 41b is provided so as to be discharged to the atmosphere by overflow when drain water introduced from the inlet-side drain hose 61 is added.
[0036]
Here, the drain water introduced from the inlet side drain hose 61 mainly contains acidic (about PH3) corrosive components such as nitrogen oxides in the exhaust gas. Is a container made of a resin material such as plastic resistant to acid and alkali or a metal material having corrosion resistance, and guides drain water from the inlet side drain hose 61 to neutralize or reform the drain water to be alkaline. The inlet side drain hose 61 is installed downstream.
[0037]
In addition, the 1st, 2nd electrodes 42 and 43 arrange | positioned facing this inside of the modification | reformation tank 41 are metal members referred to in the claim formed in plate shape with the material of magnesium.
[0038]
Next, as shown in FIG. 3, the voltage application circuit unit 45, which is a voltage application unit, applies a positive voltage (+ Vo) to the first electrode 42 and applies a negative voltage (−Vo) to the second electrode 43. A first energization mode (t seconds), and a second energization mode (t seconds) in which a negative voltage (−Vo) is applied to the first electrode 42 and a positive voltage (+ Vo) is applied to the second electrode 43. Energize to switch the polarity alternately. The voltage applied to the first and second electrodes 42 and 43 is adjusted by the reforming controller 47 so that the current flowing in the reforming tank 41 becomes a predetermined value.
[0039]
Further, the reforming controller 47 operates the drain water reformer 40 by inputting an operation signal of the engine 20 output from an air conditioning control device (not shown) that controls the engine driven air conditioner 100. It is something to be made. In the present embodiment, after the engine 20 is operated, the first and second electrodes 42 and 43 are energized after a predetermined time has elapsed, and after the engine 20 has stopped and the predetermined time has elapsed, the first and second electrodes 42 and 43 are energized. Control is performed to stop energization.
[0040]
Next, the operation of the drain water reformer 40 having the above configuration will be described. First, when the engine-driven air conditioner 100 is operated, an operation start signal for the engine 20 is input to the reforming controller 45 from an air conditioning control device (not shown). Then, the reforming controller 45 receives the operation start signal, and when a voltage is applied between the electrodes 42 and 43 after a predetermined time has elapsed and a voltage is applied between the electrodes 42 and 43, the reforming controller 45 A current flows through the drain water, and the drain water introduced is electrolyzed as shown below.
[0041]
Incidentally, the polarity of the voltage applied between the electrodes 42 and 43 is switched so as to reverse from the high potential side to the low potential side every predetermined time (t seconds). From the high potential side electrode to the high potential side polarity by electrolysis when the second electrode 43 has the low potential side polarity, Mg²⁺The chemical formula for dissolving ions will be described with reference to FIG.
[0042]
From the high potential side electrode 42 to Mg²⁺The ions dissolve and Mg as shown by the following chemical formula (1)²⁺Ion reacts with OH- to react with Mg (OH)₂Furthermore, as shown in chemical formulas (2) to (5), HNO contained in the drain water_ThreeAnd H₂SO_FourAnd Mg and Mg (OH)₂And 3Mg (NO_Three)₂And MgSO_FourSince a substance that is easily soluble in water is generated and mixed with the drain water, the acidic drain water in the reforming tank 41 is modified to be neutral or alkaline.
[0043]
[Chemical 1]
Mg²⁺+ 2OH- → Mg (OH)₂
[0044]
[Chemical 2]
3Mg + 8HNO_Three→ 3Mg (NO_Three)₂+ 2NO + 4H₂O
[0045]
[Chemical Formula 3]
Mg + H₂SO_Four→ MgSO_Four+ H₂
[0046]
[Formula 4]
Mg (OH)₂+ 2HNO_Three→ Mg (NO_Three)₂+ 2H₂O
[0047]
[Chemical formula 5]
Mg (OH)₂+ 2H₂SO_Four→ MgSO_Four+ 2H₂O
One electrode 43 on the low potential side has hydrogen ions 2H.⁺Receives electrons and hydrogen gas H₂The reaction that becomes is happening. Hydrogen gas H generated on the low potential side₂Are open to the atmosphere. When the polarities of the electrodes 42 and 43 are reversed, the hydrogen ions 2H⁺Receives electrons and hydrogen gas H₂Since the reaction shown by the chemical formulas (1) to (5) occurs at the electrode 43, the description thereof will be omitted.
[0048]
In addition, Mg on the high potential side²⁺When the ions are dissolved, magnesium of the electrode is consumed. In the present embodiment, by alternately switching between the first energization mode and the second energization mode, the electrodes 42 and 43 are alternately dissolved, so that they are evenly consumed.
[0049]
Next, when the engine 20 is stopped, a stop signal for the engine 20 is input to the reforming controller 45 from an air conditioning control device (not shown). Then, the reforming controller 45 stops the electrolysis of the drain water reformer 40 by stopping energization of the power supply to the voltage application circuit unit 45 after a predetermined time has elapsed after inputting the stop signal.
[0050]
By the way, when the engine 20 is stopped, the reformed drain water in the reforming tank 41 has a certain water level and is always in contact with both electrodes 42 and 43. Has an active characteristic (solubility) in the acidic to neutral range, but does not proceed in this region because it generates a non-moving substance on the neutral to alkaline range side.
[0051]
According to the drain water reformer 40 of the first embodiment described above, the first and second electrodes 42 and 43 formed of magnesium are disposed in the reforming tank 41 so as to be electrolyzed. From the high potential side electrodes 42 and 43, Mg²⁺Mg (OH) reacts with OH- by dissolving ions₂And HNO contained in wastewater_ThreeAnd H₂SO_FourReacts with 3Mg (NO_Three)₂And MgSO_FourAnd the like, and mixed with waste water, the acidic drain water in the reforming tank 41 can be modified to be neutral or alkaline.
Also, nitric acid HNO by electrolysis reaction using the first and second electrodes 42 and 43 formed of magnesium._ThreeCompared with the conventional method in which the decomposing ability is dissolved by filling a neutralizing agent (calcium carbonate), the amount of nitric acid decomposed per weight is²⁺Since the amount of ions is about four times as large and the decomposition speed is also fast, the drain water reformer 40 can be reduced in size and weight.
[0052]
Mg²⁺Since the first and second electrodes 42 and 43 are consumed by dissolving the ions, maintenance is required to periodically replace the electrodes 42 and 43, but a neutralizing agent (calcium carbonate) is charged. Maintenance can be performed less frequently than the conventional method. Further, the reforming controller 47 and the voltage application circuit unit 45 alternately switch the polarity to the first and second electrodes 42 and 43 to energize them, so that both the electrodes 42 and 43 are consumed in the same manner. , The replacement period can be lengthened.
[0053]
Mg²⁺When ions are dissolved, magnesium, which is one of the minerals contained in the water supply, is dissolved, so that it can be directly discharged into the sewer, and there is no concern about environmental pollution.
[0054]
In addition, magnesium has active characteristics in the acidic to neutral range, but in the alkaline range, it becomes stable to produce a non-moving substance, so that dissolution does not proceed in this range. Therefore, the electrodes 42 and 43 are not consumed when immersed in drain water modified to be alkaline.
[0055]
(Second Embodiment)
In the first embodiment described above, the drain water reformer 40 in which the first and second electrodes 42 and 43 made of magnesium are disposed in the reforming tank 41 has been described. An intermediate electrode made of magnesium may be disposed between the first and second electrodes 42 and 43.
[0056]
In the present embodiment, as shown in FIG. 4, a single intermediate electrode 44 is disposed between the first and second electrodes 42, 43, and the first, second electrodes 42, As a result, a potential difference that is approximately half of the potential difference between the four electrodes 43 is generated.²⁺Ions are dissolved and the drain water is neutralized or modified to be alkaline.
[0057]
Accordingly, the replacement period can be further increased by increasing the consumption of the electrode by one more than in the first embodiment. In addition, the treatment time for reforming the drain water can be shortened, and the drain water reformer 40 can be reduced in size.
[0058]
Furthermore, the number of intermediate electrodes 44 may be further increased. In the present embodiment, as shown in FIG. 5, a plurality of intermediate electrodes 44 made of magnesium are disposed between the first and second electrodes 42 and 43, and the first and second electrodes 42 and 43 are precious metal. (Such as Pt) or a noble metal alloy (such as Pt—Ti). According to this, from the intermediate electrode 44 formed of magnesium, Mg²⁺Ions are dissolved and the drain water is neutralized or modified to be alkaline.
[0059]
As a result, the total area of the magnesium electrode 44 can be increased, and the drainage water can be neutralized or modified to be alkaline in a short time in the reforming tank 41 having a small volume. In addition, since the first and second electrodes 42 and 43 made of a Pt—Ti alloy or the like are hardly consumed, it is preferable to perform periodic maintenance using only the intermediate electrode 44 made of a magnesium material as a replacement part. Therefore, it is not necessary to replace the first and second electrodes 42 and 43, and the replacement cost can be reduced. In addition, if the intermediate electrodes 44 are joined together via an electrically insulating spacer (not shown), the workability at the time of replacement is simplified and the workability at the time of maintenance is improved.
[0060]
(Third embodiment)
In the above embodiment, the drain water is subjected to electrolysis in the reforming tank 41 into which drain water has been introduced using the electrodes 42, 43, and 44 made of magnesium material.²⁺Although ions are dissolved, the present invention is not limited to this, and a standard electrode potential difference between metals may be applied. This standard electrode potential difference generates a potential difference between metals when different metals are electrically connected. For example, between stainless steel and magnesium, the standard is about 2.0 V with the magnesium side serving as a sacrificial electrode. An electrode potential difference occurs. Thereby, dissolution (corrosion) on the magnesium side is promoted.
[0061]
Therefore, in the drain water reformer 40 of the present embodiment, as shown in FIG. 6, the exhaust heat exchanger 32 that is an exhaust member is formed of stainless steel, and a plurality of plate-like metal members 42 formed of magnesium are provided. These are disposed in the individual reforming tank 41, and one end of each is electrically connected to the exhaust heat exchanger 32.
[0062]
An open / close switch is provided as an open / close means for opening and closing the electrical continuity between each metal member 42 and the exhaust heat exchanger 32 while being electrically connected. Further, the open / close switch 46 is controlled by a reforming controller 47. Incidentally, after the engine 20 is operated, the opening / closing switch 46 is turned on after a predetermined time has elapsed, and after the engine 20 has stopped, the opening / closing switch 46 is opened after the predetermined time has elapsed.
[0063]
Incidentally, when the engine 20 is operated and drain water generated in the exhaust system 30 is introduced into the reforming tank 41, the opening / closing switch 46 is electrically connected so that the metal member 42 and the exhaust heat exchanger 32 are connected. A standard electrode potential difference is generated between them. Thereby, Mg metal is drained from the metal member 42 on the magnesium side.²⁺Ions are dissolved. Therefore, Mg²⁺By dissolving ions in the drain water, the drain water can be modified to be neutral or alkaline as in the first and second embodiments.
[0064]
According to the drain water reformer 40 of the above embodiment, by applying the standard electrode potential difference between different metals, the metal member 42 made of magnesium is electrically connected to the exhaust heat exchanger 32 made of stainless steel. In addition to corrosion protection of the exhaust heat exchanger 32 on the stainless steel side, Mg is transferred from the metal member 42 to the drain water.²⁺Ions can be dissolved and drain water can be modified to be neutral or alkaline.
[0065]
Further, the method using the standard electrode potential difference can provide the drain water reformer 40 having a simpler structure than the method of performing electrolysis.
[0066]
In the present embodiment, the exhaust heat exchanger 32 is made of stainless steel. However, the present invention is not limited to this. For example, the exhaust muffler 33 and other components constituting the engine-driven air conditioner are made of stainless steel. The metal member 42 may be electrically connected.
[0067]
(Other embodiments)
In the above embodiment, the metal members 42, 43, 44 made of magnesium are electrolyzed and the standard electrode potential difference is applied to the drain water from the metal members 42, 43, 44 to Mg.²⁺Ions are dissolved, but the magnesium material may be immersed in acidic drain water.
[0068]
Specifically, as shown in FIG. 7, a plurality of metal members 42 made of magnesium are disposed in the reforming tank 41. This is because the metal member 42 is immersed in acidic drain water, and the metal member 42 itself is oxidized (corroded) to form Mg (OH) as an oxide film.₂And this Mg (OH)₂Easily melts into acidic drain water, so that the drain water can be modified to be neutral or alkaline.
[0069]
According to this, the consumption of the metal member 42 is reduced as compared with the above embodiment, the replacement period for maintenance can be extended, the number of parts is small, and the structure is simple, so the cost is low and light. Can be achieved.
[0070]
Further, in the first and second embodiments described above, the operation start signal and the stop signal of the engine 20 from the air conditioning control device (not shown) of the engine driven air conditioner are input to the reforming controller 45 to drain water. The reformer 40 is controlled to be activated and stopped. However, the present invention is not limited to this. For example, a pH sensor is provided in the reforming tank 41 to detect the pH value of the drain water, and the drain water is modified based on the detected value. It is also possible to operate and stop the mass device 40. As a result, it is possible to reform acidic drain water with higher accuracy than control that is performed after a predetermined time elapses after the engine 20 is operated, or that is stopped after a predetermined time elapses after the engine 20 is stopped.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing an overall configuration of an engine-driven air conditioner according to a first embodiment of the present invention.
FIG. 2 is an overall configuration diagram showing an overall configuration of a drain water reformer 40 in the first embodiment of the present invention.
FIG. 3 is an explanatory diagram showing switching of the polarity of the voltage application circuit 45 in the first embodiment of the present invention.
FIG. 4 is an overall configuration diagram showing an overall configuration of a drain water reformer 40 in a second embodiment of the present invention.
FIG. 5 is an overall configuration diagram showing an overall configuration of a drain water reformer 40 in a second embodiment of the present invention.
FIG. 6 is an overall configuration diagram showing an overall configuration of a drain water reformer 40 in a third embodiment of the present invention.
FIG. 7 is an overall configuration diagram showing an overall configuration of a drain water reformer 40 in another embodiment.
[Explanation of symbols]
11 ... Compressor
12 ... Outdoor heat exchanger
13 ... Expansion valve
14 ... Indoor heat exchanger
20 ... Engine
30 ... Exhaust system
32. Exhaust heat exchanger (exhaust member)
33 ... Exhaust muffler (exhaust member)
40 ... Drain water reformer
41 ... reforming tank
42 ... 1st electrode, metal member (metal member, electrode)
43 ... Second electrode (metal member, electrode)
44 ... Intermediate electrode (metal member, electrode)
45 ... Voltage application circuit (voltage application means)
46. Open / close switch (open / close means)

Claims (3)

A refrigeration circuit (10) comprising a compressor (11) driven by an engine (20), an outdoor heat exchanger (12), an expansion valve (13) and an indoor heat exchanger (14) connected by refrigerant piping;
An exhaust system (30) for exhausting exhaust gas of the engine (20);
A drain water reformer for an engine-driven air conditioner, comprising a drain water reformer (40) for reforming and discharging drain water generated in the exhaust system (30) to neutral or alkaline,
The drain water reformer (40) includes a reforming tank (41) for circulating the drain water and a plurality of metal members (42, 43, 44) made of a magnesium material, and the plurality of metal members ( 42, 43, 44) in which Mg ²⁺ ions are dissolved in the drain water to modify the drain water in the reforming tank (41) to be neutral or alkaline .
The exhaust system (30) is provided with exhaust members (32, 33) made of stainless steel, and electrically connects the plurality of metal members (42, 43, 44) to the exhaust members (32, 33). ,
The drain water reformer (40) generates a standard electrode potential difference between the plurality of metal members (42, 43, 44) and the exhaust member (32, 33), thereby the plurality of metal members (42). , 43, 44) engine driven type characterized in that Mg ²⁺ ions are dissolved in the drain water to reform the drain water in the reforming tank (41) to neutral or alkaline Air conditioner drain water reformer. Opening / closing means (46) for opening and closing electrical connection between the metal members (42, 43, 44) and the exhaust members (32, 33) includes the metal members (42, 43, 44) and the exhaust members ( 32, 33),
2. The engine driven type according to claim 1, wherein the drain water reformer (40) conducts the opening / closing means (46) when the engine (20) is operating. Air conditioner drain water reformer. An exhaust system (30) for exhausting an exhaust gas containing an acidic component burned in a combustion chamber;
A drain water reformer comprising: a drain water reformer (40) for discharging drain water generated in the exhaust system (30) to neutral or alkaline;
The drain water reformer (40) includes a reforming tank (41) for circulating the drain water and a plurality of metal members (42, 43, 44) made of a magnesium material, and the plurality of metal members ( 42, 43, 44) in which Mg ²⁺ ions are dissolved in the drain water to modify the drain water in the reforming tank (41) to be neutral or alkaline.
The exhaust system (30) is provided with exhaust members (32, 33) made of stainless steel, and electrically connects the plurality of metal members (42, 43, 44) to the exhaust members (32, 33). ,
The drain water reformer (40) generates a standard electrode potential difference between the plurality of metal members (42, 43, 44) and the exhaust member (32, 33), thereby the plurality of metal members (42). , drain water breaks, characterized by being configured so as to reform the drain water in the neutral or alkaline said reforming tank drain water to dissolve the Mg ²⁺ ions (41) from 43 and 44) A genitalia.

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