JPH0330641Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an exhaust gas boiler that recovers heat from various exhaust gases.

In a conventional exhaust gas boiler, as shown in FIG. 1, feed water FW enters a drum 1, passes through a downcomer pipe 2, is distributed from an inlet header 3 to a heat transfer tube 4, and is heated within the heat transfer tube 4. The heated fluid turns into a steam-water mixture of water and steam, collects at the outlet header 5, and then is led to the drum 1 through the riser pipe 6. Water and steam are separated in the drum 1, and the generated steam S passes through the dryer 7 and exits the system as boiler output, but the separated water circulates through the downcomer pipe 2 together with the water supply. In such a conventional type, when the size is reduced, the heat exchanger tubes 4 are crowded together, which makes it difficult to fabricate the upper and lower headers 3, 4 and the riser tube 6.

Therefore, the present invention was made with the aim of providing an exhaust gas boiler that overcomes the drawbacks of the conventional ones.The steam separation chamber is constructed using the tube plate of the heat exchanger tube, and the header and riser pipe are eliminated. This system realizes a compact, highly reliable, and low-cost steam generation facility.The main idea is that the bottom surface of the steam separation chamber located at the top and the top surface of the distribution chamber located at the bottom are constructed with tube plates. In a device in which a steam separation chamber and a distribution chamber are communicated via a heat transfer tube fixed between the tube sheets, and heat exchange is performed between the exhaust gas flowing outside the heat transfer tube and the water flowing inside the tube, the steam separation chamber A partition plate is installed to separate the top and bottom into upper and lower parts, and the water supply inlet pipe and downcomer pipe are connected to the steam separation chamber below the partition plate, and the other end of the downcomer pipe is connected to the distribution chamber. This exhaust gas boiler is characterized in that it is open to a steam separation chamber and that a partition plate is provided with a gap portion that communicates between the upper and lower portions of the partition plate.

According to the present invention, since the steam separation chamber is formed by a tube plate, the structure becomes compact and manufacturing becomes easy. Further, a partition plate is provided in the steam separation chamber, and the water supply inlet pipe and the downcomer pipe are connected to the steam chamber below the partition plate, so that turbulence of the water surface in the steam chamber due to lateral flow of water is prevented. Furthermore, since the heat exchanger tube is configured to open above the partition plate, this extension can be used to perform welding of the heat exchanger tube to the tube sheet (it can be used for positioning the welding device). On the other hand, the upper and lower parts of the partition plate are connected through the gap provided in the partition plate, so water leaving the heat transfer tube moves from the upper part of the partition plate to the lower part of the partition plate, and then descends through the downcomer pipe and circulates. do.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3.

11 is a steam separation chamber provided in the upper part of the exhaust gas boiler, and a tube plate 21 is arranged on the lower surface. A downcomer pipe 12 communicates the lower portion of the vapor separation chamber 11 partitioned by the partition plate 16 with the distribution chamber 13. Reference numeral 14 denotes a heat transfer tube fixed between the tube plate 22 on the upper surface of the distribution chamber 13 and the tube plate 21, and an outlet pipe 15 is provided above the tube plate 21.
are connected and open at the top of the partition plate 16. 1
7 is a dryer provided at the steam outlet of the steam separation chamber 11; 18 and 20 are inlet and outlet ducts for exhaust gas (heated gas), respectively; and 19 is a baffle for making the exhaust gas meander.

Partition plate 1 from water supply inlet pipe 23 to steam separation chamber 11
The feed water entering the lower part of the tube 6 passes through the downcomer pipe 12 and is distributed to the heat transfer tubes 14 in the distribution chamber 13. The fluid heated in the heat transfer tube 14 becomes a two-phase flow of steam and water and enters directly into the upper part of the partition plate 16 of the steam separation chamber 11 through the outlet tube 15. Steam separated into steam and water in the steam separation chamber 11 exits the system via the dryer 17 as boiler output. The water separated in the steam separation chamber 11 passes through the gap 24 provided in the partition plate 16 and reaches the partition plate 1.
The water moves from the upper part of the pipe 6 to the lower part of the partition plate 16, and circulates along with the water supply through the downcomer pipe 12. Steam separation chamber 11
A partition plate 16 is installed inside the steam separation chamber 11.
This prevents turbulence on the water surface due to the lateral flow of water flowing in and out of the water, promoting the air-water separation effect. The heated gas enters through the inlet duct 18, heats the heat transfer tube 14 while the gas flow is controlled by the buffer 19, and is discharged from the system through the outlet duct 20.

By constructing the drum using the tube plate of the heat exchanger tube in this way, it is possible to obtain a compact heat exchanger, further reduce the number of welding points, improve reliability, and reduce costs.

[Brief explanation of the drawing]

FIG. 1 is a front view showing a conventional exhaust gas boiler, FIG. 2 is a front view showing an embodiment of the present invention, and FIG. 3 is a detailed view of section A in FIG. 2. 11... Steam separation chamber, 12... Downpipe, 13...
... Distribution chamber, 14 ... Heat exchanger tube, 15 ... Outlet pipe, 1
6... Partition plate, 17... Dryer, 18... Inlet duct, 19... Buzzful, 20... Outlet duct, 21, 22... Tube plate.

Claims (1)

[Scope of utility model registration request] The bottom surface of the vapor separation chamber provided at the top and the top surface of the distribution chamber provided at the bottom are constructed of tube sheets, and the vapor separation chamber and the distribution chamber are communicated with each other through heat transfer tubes fixed between the tube sheets. In heat exchanges between the exhaust gas flowing outside the heat tube and the water flowing inside,
A partition plate is provided to divide the inside of the steam separation chamber into an upper and lower part, and the water supply inlet pipe and the downcomer pipe are connected to the steam separation chamber below the partition plate, and the other end of the downcomer pipe is connected to the distribution chamber, and the heat exchanger tube is connected to the partition plate. 1. An exhaust gas boiler characterized in that the partition plate is opened to an upper steam separation chamber and a gap is provided in the partition plate so that the upper and lower parts thereof communicate with each other.