JPH0476212A - Heat/electric power cogenerating device - Google Patents

Abstract

PURPOSE:To prevent blowoff of poisonous gas such as NOx, to remove also dust and to make further good use of exhaust heat by arranging a spray nozzle to spray exhaust gas treating aqueous solution in the upper part so that an exhaust gas treating device possessing a liquid tank in the lower part can be connected in series to an exhaust gas pipeline. CONSTITUTION:In a cogenerating device, a cooling jacket of an engine 1 connected directly with a generator 2 is connected to a water/water heat exchanger 5 through a primary pipeline 6, and a gas/water heat exchanger 4 is arranged in an exhaust gas pipeline 3 so that water in a secondary pipeline 7 can be circulated between the secondary side of the water/water heat exchanger 5 and the gas/water heat exchanger 4. In this case, an exhaust gas treating device 9 consisting of a spray nozzle 12 to spray exhaust gas treating aqueous solution passing through a pipeline 11 from a pump 10, granular matters 13 provided so that the exhaust gas and the exhaust gas treating aqueous solution provided in the lower part of it can be brought sufficiently into contact with each other and a liquid tank 14 to store the exhaust gas treating aqueous solution in the lower part of it is connected in series to the downstream side of the gas/water heat exchanger 4. An endothermic pipeline 15 connected in series to the secondary pipeline 7 is arranged in the liquid tank 14.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a combined heat and power generation system in which exhaust heat from an engine that drives a generator can also be recovered within an exhaust gas treatment system.

B0 Summary of the Invention The combined heat and power device of the present invention includes an exhaust gas treatment device having a spray nozzle for dispersing an aqueous exhaust gas treatment solution in the upper part and a liquid tank in the lower part, which is connected in series to the exhaust pipe of a prime mover. A pipe line equipped with a pump is connected between the spray nozzles to circulate the exhaust gas treatment solution between the liquid tank and the spray nozzle to perform exhaust gas treatment. A heat absorption pipe connected in series with the exhaust gas treatment equipment is installed in the exhaust gas treatment equipment to exchange heat with the exhaust gas treatment aqueous solution or exhaust gas heated by the exhaust gas, so that engine exhaust heat can also be recovered within the exhaust gas treatment equipment. be.

C0 Prior Art As shown in Fig. 4, a conventional combined heat and power system generates electricity by directly connecting a generator 2 to an engine 1, such as a diesel engine that uses heavy oil as fuel, and a cooling jacket for the engine 1. A water/water heat exchanger 5 is connected to the water/water heat exchanger 5 through a primary pipe 6, and a gas/water heat exchanger 4 is provided in the exhaust pipe 3, so that the water in the secondary pipe 7 is transferred to the secondary side of the water/water heat exchanger 5. The fresh water is circulated through the gas/water heat exchanger 4, and the fresh water is heated through the water/water heat exchangers (not shown) on the secondary piping A and B sides to supply hot water.

The temperature of the exhaust gas discharged through the gas heat exchanger 4 of this conventional combined heat and power system is approximately 200°C. Further, in the secondary piping, for example, when water is supplied from the A side at about 80°C, hot water is heated to about 90°C from the B side.

D1 Problems to be solved by the invention Conventionally, combined heat and power systems using diesel engines have been subject to strict pollution regulations due to the generation of harmful gases such as NOx due to the lack of suitable exhaust gas treatment equipment to treat exhaust gas from diesel engines, etc. Cannot be used in urban areas.

■ Heat cannot be absorbed until the temperature of the exhaust gas falls below approximately 200°C due to sulfuric acid corrosion, etc., so much of the heat in the exhaust gas is released into the atmosphere.

It had such problems.

The present invention was made in view of these conventional problems, and its objectives are to eliminate pollution caused by harmful gases such as NOx, remove soot and dust, and further utilize the exhaust gas at temperatures below 200°C. The object of the present invention is to provide a highly efficient combined heat and power generation device at a relatively low cost.

80 Means for Solving the Problems In order to achieve the above objects, the combined heat and power generation device of the present invention has the following features:
A generator is driven by a prime mover, exhaust gas generated from the prime mover is discharged through an exhaust pipe, and a primary pipe is provided between a cooling jacket of the prime mover and a water/water heat exchanger,
In a combined heat and power system that has secondary piping installed between this water/water heat exchanger or between this water/water heat exchanger and a gas/water heat exchanger connected to an exhaust pipe, exhaust gas treatment is provided at the upper part. An exhaust gas treatment device equipped with a spray nozzle for dispersing an aqueous solution and a liquid tank at the bottom is connected in series to the exhaust pipe, and piping for circulating the exhaust gas treatment aqueous solution is provided between the liquid tank and the spray nozzle, and the exhaust gas treatment The apparatus is provided with heat absorption piping connected in series with the secondary piping.

An aqueous solution for exhaust gas treatment, such as a sodium azide aqueous solution, in the lower liquid tank of the F9 action exhaust gas treatment device is supplied to the upper spray nozzle, sprayed, and circulated. The sprayed exhaust gas treatment aqueous solution comes into contact with the exhaust gas and generates N.

Chemically reacts with gases such as X to create harmless gases such as N+H20. (For details of the principle, see Japanese Patent Application No. 1-30236.
See issue. ) The circulating exhaust gas treatment aqueous solution absorbs the heat of the exhaust gas and becomes high temperature. The water in the secondary pipe flowing through the heat absorption pipe provided in this exhaust gas treatment device absorbs heat from the high temperature exhaust gas treatment aqueous solution or exhaust gas. Therefore, in addition to the absorption of heat by the conventional water/water heat exchanger connected to the cooling jacket or the gas/water heat exchanger connected to the exhaust pipe, the water in the secondary pipe is also absorbed by the exhaust gas treatment equipment. , the overall efficiency of the combined heat and power generation device is improved.

G. Embodiments Examples of the present invention will be described with reference to the drawings. Incidentally, the same constituent parts as those shown in FIG. 4 and the same constituent parts in each embodiment are given the same reference numerals, and redundant explanation thereof will be omitted.

First Embodiment Referring to FIG. 1, reference numeral 9 denotes an exhaust gas treatment device connected to the downstream side of the gas/water heat exchanger 4, and 10 denotes an exhaust gas treatment device for treating exhaust gas, for example, by applying an aqueous exhaust gas treatment solution such as a sodium azide aqueous solution. 11 is the piping from the pump.

The exhaust gas treatment device 9 includes a spray nozzle 12 for spraying an aqueous exhaust gas treatment solution from a pipe 11, a granular material 13 provided below the spray nozzle 12 so that the exhaust gas and the sprayed aqueous exhaust gas treatment solution come into good contact with each other, and It is comprised of a liquid tank 14 provided at the bottom that stores an aqueous exhaust gas treatment solution and supplies it to a pump 14.

In this exhaust gas treatment device 9, exhaust gas enters from the lower part of the granules 12, passes through the gaps between the granules, and is discharged from the outlet 8 at the upper part. Further, inside the liquid tank 14, a heat absorption pipe 15 connected in series with the secondary pipe 7 is provided.

Next, the operation of this embodiment will be explained.

The exhaust gas treatment aqueous solution in the liquid tank 14 is sent to the spray nozzle 12 by the pump 1o and sprayed, and the sprayed aqueous solution comes into contact with the exhaust gas or wets the surface of the particulate matter 12, and returns to the liquid tank 14 for circulation. When the sprayed exhaust gas treatment aqueous solution comes into contact with the exhaust gas, harmful gases such as NOx in the exhaust gas chemically react to become harmless gases such as N and H2O, which are discharged into the atmosphere.

At this time, the unreacted exhaust gas treatment aqueous solution directly absorbs the heat of the exhaust gas and becomes high temperature, so that the water in the secondary pipe line 7 passing through the endothermic pipe 15 provided in the liquid tank 14 is heated. Therefore, the heated water in the secondary pipe 7 is
It is heated by a water heat exchanger 5 and a gas/water heat exchanger 4.

As described above, since the exhaust heat of the engine 1 is also absorbed in the exhaust gas treatment device 9, the overall efficiency of the combined heat and power generation device is improved. Further, harmful gases such as NOx in the exhaust gas are released as harmless gases, and soot and dust are absorbed by the exhaust gas treatment aqueous solution and are not released. Since the liquid is circulated by the pump 10, it does not scatter outside unnecessarily, so the amount consumed is small and economical.

2nd Embodiment Regarding FIG. 2, this embodiment is different from the first embodiment (by eliminating the gas/water heat exchanger 4 and directly connecting the exhaust gas treatment device 9 to the exhaust pipe 3 to remove the heat of the exhaust gas. Heat is absorbed by the exhaust gas treatment aqueous solution, and heat absorption piping 15 is heated in the liquid tank 14.

The particulate matter 12 provided in the exhaust gas treatment apparatus in the first and second embodiments can be made into a shape having a large surface area, such as a screen shape or a lattice shape. In addition, since the sprayed exhaust gas treatment aqueous solution only needs to come into good contact with the exhaust gas,
It is also possible to omit the above-mentioned particulate matter and leave the interior of the exhaust gas treatment device as a cavity.

Third Embodiment Referring to FIG. 3, in this embodiment, the heat absorption piping 15 in the second embodiment is distributed almost throughout the exhaust gas treatment device 9, and heat is absorbed in the liquid tank 14 and the exhaust gas is distributed. It is designed so that it can also absorb heat.

In this embodiment as well, granules and the like can be placed inside the exhaust gas treatment device.

Moreover, since the exhaust gas treatment apparatuses in the first to third embodiments can have the function of a muffler, it is possible to eliminate the need for a muffler. It is preferable to remove the soot and dust trapped in the exhaust gas treatment aqueous solution using a filter.

H1 Effects of the Invention Since the present invention is configured as described above, it produces the following effects.

(1) NOx, soot, etc. in exhaust gas can be removed to make it harmless gas. This makes it possible to install combined heat and power generation systems using diesel engines, which previously could not be used due to pollution regulations, in urban areas.

(2) In addition to the conventional absorption of exhaust heat, the absorption of heat by dispersing the aqueous solution for exhaust gas treatment in the exhaust gas treatment equipment makes it possible to absorb heat up to an exhaust gas temperature of 200°C or less, greatly increasing the overall efficiency of the combined heat and power generation equipment. improve.

(3) Since the exhaust gas treatment device can also be expected to have a silencing effect, it becomes possible to eliminate the need for installing a muffler.

[Brief explanation of the drawing]

1 to 3 are explanatory diagrams of the configuration of different embodiments of the present invention, and FIG. 4 is an explanatory diagram of the configuration of a conventional combined heat and power supply device. 1...engine, 2...generator, 3...exhaust pipe,
4... Gas/water heat exchanger, 5... Water/water heat exchanger,
9...Exhaust gas treatment device, 10...Pump, 12...
・Spray nozzle, 13...Particles, 14...Liquid tank, 1
5... Heat absorption piping. 1 person outside / Ennon 2... Generator 3... Exhaust pipe 4... Gas/water heat exchanger 5... Water/water heat exchanger 7... Secondary piping 9... Exhaust gas treatment equipment 1O ... Pump 12 ... Spray nozzle 13 ... Granular material 14 ... Liquid tank 15 ... Heat absorption piping 3rd embodiment Figure 2 2nd embodiment Conventional example

Claims (1)

[Claims] (1) A generator is driven by a prime mover, and the exhaust gas generated from the prime mover is discharged through an exhaust pipe, and a primary pipe is provided between the cooling jacket of the prime mover and the water/water heat exchanger, and the / In a combined heat and power system with secondary piping installed between the water heat exchanger or between this water/water heat exchanger and the gas/water heat exchanger connected to the exhaust pipe, the exhaust gas treatment aqueous solution is placed in the upper part. An exhaust gas treatment device equipped with a spray nozzle for spraying and a liquid tank at the bottom is connected in series to the exhaust pipe, and piping for circulating the exhaust gas treatment aqueous solution is provided between the liquid tank and the spray nozzle, and A heat absorption pipe is provided in which the secondary pipe is connected in series,
A combined heat and power generation device characterized by recovering engine exhaust heat even within the exhaust gas treatment device.