JPS5811302A - Waste heat recovering heat exchanger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention: For example, in order to effectively utilize the residual heat in the exhaust gas of a gas turbine, this heat is used to generate steam for a steam turbine; This invention relates to the refreshing of exhaust heat recovery heat exchange III.

Combined cycle power generation is a power generation system that increases patent efficiency by combining a gas turbine and a steam turbine, and various cycles have been considered as this combined cycle power generation. A typical cycle conventionally used will be explained with reference to FIG.

That is, high-pressure, high-temperature O combustion gas produced by the sophisticated combustor shown in the figure flows into the gas turbine 1 and is rotated at high speed, thereby decreasing its pressure and temperature and being discharged. Jin's exhaust gas temperature 310, normal Boo ~60
Since the temperature is 0°C, the O discarded from this bottle as exhaust air fx is extremely uneconomical. The exhaust heat recovery heat exchanger 1 was provided for this reason. This waste heat recovery heat exchanger 1#
i. The exhaust heat recovery heat exchanger main body (hereinafter simply referred to as the main body) 1 has a large number of heat transfer tubes 4, and the gas turbine 10 high-temperature exhaust gas has an inlet in the main body j! Main body J through Tato I
(by forced heat transfer means) and exchanges water and exhaust gas with O heat exchange tubes.

Exhaust gas xd flowing into the main body 1, Nomide 8 facing upward
It exits through the outlet duct of the main body 3 to a chimney (not shown). Here, the evaporator # and the economizer 8 are constituted by a large number of heat exchanger tubes 4, and steam and water flow inside the heat exchanger tubes 4. One end of the Economide IO heat transfer tube 40 is connected to the water supply pipe 10, and the other end of the heat transfer tube 4 is connected to the water supply pipe 10.
It is connected to the lower part of the steam drum 11.

Further, both ends of the heat transfer tube 40 of the evaporator 6 are attached to the steam door 2511. Further, a main steam pipe 11 is connected to the upper end of the steam drum 11], and the main steam pipe 11 is led to a steam turbine JJK.

9. A condenser 14 is installed in series with the steam turbine IJ.

In the above configuration, the exhaust steam of the steam turbine 12 is
The condensed water is condensed in the condenser 14 and is force-fed to the economizer 8 from the water supply pipe 10 by the p1 water supply pore fll. The feed water heated by the economizer 1 flows into the lower part of the steam drum 110. The water in the steam drum 11 is sent from the bottom of the steam drum 11 to the evaporator σ by the transfer pump fl#, evaporates in the heat transfer tube 4, and returns to the upper part of the steam drum 1 again as steam and barley.

Steam in the steam drum 11 is extracted from the upper part of the steam drum 11, introduced into the steam turbine JJK from the main steam pipe 1z, and flows into the condenser 14 again. It has been confirmed that in an exhaust heat recovery type combined cycle power plant with such a configuration, the plant thermal efficiency is increased by several orders of magnitude compared to conventional plants because the high-temperature Ganu turbine exhaust gas is effectively used.

When actually installing the exhaust heat recovery heat exchanger 1 described above, the evaporator C1 exhaust gas denitrification device 1, economizer 1, etc. are each installed separately as one box-shaped blade knit, as shown in Fig. 2. After manufacturing and assembling, the younger knit is flange 11
are connected at IF via IF, and the whole is installed in exhaust heat recovery heat exchanger frame 1#. At this time, the L duct 19 and the outlet duct t are also connected by the seven twisters 11. Exhaust heat recovery type humbind cycle power generation! In order to effectively utilize high-temperature gas turbine exhaust gas, it is essential to use heat insulating materials to minimize heat radiation from the outer panels 10 of each unit that constitutes the exhaust heat recovery heat exchanger. .

As a general method for applying the heat insulating material, an external heat insulating method is considered, in which the heat insulating material is placed in a bottle on the outside of the outer panel 20 of each unit, since the construction is extremely simple. However, the exhaust gas of the Ganu turbine flowing inside the #heat recovery heat exchanger 2 is usually at a high temperature of 500 to 600 degrees Celsius, and each component that constitutes the 1 exhaust heat recovery heat exchange gSj and is also a part of the strength member 22F
When exhaust gas is directly applied to the outer plate 1° of 1, the outer plate 10 of 1, 1 and 1 becomes as high as 500° C., which is close to the temperature of the exhaust gas. Therefore, each unit outer plate 1# must be made of a material that can be used for a long time in the same temperature range and has sufficient strength. Carbon steel is an example of this material, but carbon steel has a drawback in that it is not suitable for practical use because its mechanical strength is extremely reduced when the temperature approaches 500°C. For this reason, it is necessary to increase the plate thickness to compensate for the decrease in mechanical strength, which results in an increase in weight, which goes against the grain of resource conservation, and increases construction costs.

On the other hand, the above-mentioned material is Nutenrenu steel, which can compensate for the disadvantages of the above-mentioned carbon steel, but is extremely expensive and therefore impractical.

The present invention has been made in order to improve the above-mentioned drawbacks, and its purpose is to attach heat insulating material and lagging to the inner surface of the outer panel of each unit F. Temperatures are low, making it possible to use 6-legged bare steel for gatekeepers, making the lagging mounting holes larger (K), easily absorbing the elongation of the lagging due to the temperature difference between the outer panel and the lagging, and To provide a compact waste heat recovery heat exchanger with sufficient strength and durability.KT
oru.

Below is Honji F! A! The explanation will be based on the embodiment shown in FIG. The same parts as those explained in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations will be omitted.

Figure WJ3 is an enlarged view of the attachment portion of the heat insulating material xio on the inner surface of the outer panel 20 according to the present invention. That is, a large number of heat insulating material attachment pins 21 are attached to the inner surface of the outer plate 2o of each unit constituting the exhaust heat recovery heat exchanger 2 by welding. The heat insulating material JJK has a mounting hole at the same position as the heat insulating material mounting pin 22. In addition, heat-resistant adhesive JIJtIk is applied to the surface of the heat insulating material xi in contact with the forest outer panel 20, and the heat insulating material xi is attached to the heat insulating material mounting pin JJ. Lagging (thermal outer covering material) 24 is provided on the inner surface of the heat insulating material z1, and a washer J5 is provided so that the two laggings 24 do not come into direct contact with the heat insulating material 21. Also, 2ji'anda Jl14
By making the mounting hole larger than the diameter of the insulation material mounting pin 22, installing a washer 2J on it, and welding this washer 2j and the insulation material mounting pin 2J,
It has a structure in which the heat insulating material 111 and the 2-ging 24 are fixed to the outer panel 20.

Next, the operation of the exhaust heat recovery heat exchanger configured as described above will be explained. Exhaust heat recovery heat exchanger 11m consists of 22 pieces each) 0 outer plate is attached to the inner surface of the heat insulating material 21]
1. Because the heat of the high-temperature exhaust gas is cut off quickly. The temperature of the outer plate 2- is always at a low temperature. On the other hand, the 2nd gear 114 attached to the inner surface of the outer panel 20 is in contact with high-temperature exhaust gas, and the exhaust gas temperature is always around 500°C, causing expansion due to the temperature difference with the outer panel 2#. It makes a difference. The difference in elongation of the twin 110 caused by the temperature difference between the lagging 14 and the outer plate 20 is
The diameter of the line 200 can be easily accommodated by the displacement of the mounting hole, which is also larger than the diameter of the heat insulating material mounting pin 22. Between the 2-ring 14 and the insulation material 110,
By providing the washer 2J, a gap is provided between the lagging 14 and the heat insulating material 11, which prevents wear of the heat insulating material 21 when the lagging 14 is extended, and also facilitates the extension of the lagging 14.

Therefore, the heat insulating materials J1 and 2 ings 14 attached to the inner surface of the outer panel 1# can keep the temperature of the outer panel 10 at a low temperature and absorb the elongation due to the temperature difference between the outer panel 20 and the lagging J4. Become.

According to the present invention described above, it is possible to provide an exhaust heat recovery heat exchanger that can bring the outer panel into a low temperature state and easily collect the elongation due to the temperature difference between the outer panel and the second gear.

[Brief explanation of the drawing]

Figure 1 shows exhaust heat recovery type combined cycle power generation! A schematic system diagram of the Zundt, Fig. 2 is a configuration diagram showing an example of a conventional waste heat recovery heat exchanger, and Fig. 3 shows only the heat insulation material attachment part of an embodiment of the waste heat recovery heat exchanger according to the present invention. It is an enlarged view. 1-・Gas turbine, 1-・Exhaust heat recovery heat exchanger, 3.
・Exhaust heat recovery heat exchanger body, 4-heat transfer tube, J-...input rod! g, 6... evaporator, 1. ...Exhaust gas denitrification equipment, 8
...Economizer, 9-...Exit shutoff, 10...
Water supply pipe, 11--Steam drum, 12--Main steam pipe, 13
・-Steam turbine 14・-Condenser, 15... Water pump, 1#...Transfer 4 pump, 17...72 engine, 1
8...Exhaust heat recovery heat exchanger frame, 1#-L is dak),
J#--Outer panel of each unit, Jll-insulating material, 22-
・Heat insulation material mounting pin, 11...Heat-resistant adhesive, 24...
2 gings, 25-washers. Figure 3: Haruki Shimada, Commissioner of the Patent Office, J4, p. 8, 1983, No. 1, Indication of the case, Patent Application No. 686, No. 10, 1983, Name of the invention: Exhaust heat recovery heat exchanger 3, Person making the amendment: Relationship: Patent applicant α's Tokyo Shibaura Electric Co., Ltd. 4, agent 5, engraving of voluntarily amended specification (no changes in content)

Claims (1)

[Claims] Ganuta v:/'o In the exhaust heat recovery heat exchanger used for combined cycle power generation in which the exhaust gas is used to generate steam for the steam turbine, the inner surface of the outer panel of the heat exchanger Enit is protected from being heated by the high temperature exhaust gas. A heat insulating layer is provided on the heat insulating layer, and the mounting hole provided in the heat insulating lining is made larger than the outside diameter of the mounting member, making it possible to absorb the elongation caused by the temperature difference between the outer panel and the heat insulating layer. vessel.