Forced water circulation structure of hot water boiler

Abstract

The invention discloses a forced water circulation structure of a hot water boiler, relates to a water circulation structure of a boiler, and aims to solve the problems that an existing boiler is low in water speed, non-uniform in water flow distribution and thermal deviation, and particularly under the condition of poor water quality, scale is attached to the inner wall of a water pipe, so that heat transfer is affected, and even pipe explosion is caused. The coal economizer is communicated with the boiler barrel through a connecting pipe, the boiler barrel is communicated with the front lower collecting box, the boiler barrel is communicated with the rear lower collecting box, the front lower collecting box is communicated with the front upper collecting box, the rear lower collecting box is communicated with the rear upper collecting box, the front upper collecting box is communicated with one side lower collecting box, the rear upper collecting box is communicated with the other side lower collecting box, and each side lower collecting box is communicated with the side upper collecting box through a side water cooling wall. Each side upper header is communicated with a flue rear underwater header through a leading-out pipe, a convection heating surface is installed in a flue of the hot water boiler, the flue rear underwater header is communicated with a flue rear overwater header through the convection heating surface, and the flue rear overwater header is communicated with a water outlet header through a leading-out pipe. The invention is used in the field of boiler use.

Description

Technical Field

[0001] The invention relates to a water circulation structure of a boiler, in particular to a forced water circulation structure of a hot water boiler. The invention is used in the field of boiler use. Background Art

[0002] Traditional industrial coal-fired boilers are mainly layer-fired boilers, and coal-fired industrial boilers will still be the dominant equipment for industrial boilers. Since its advent, corner tube boilers have been widely used in the market due to their many advantages such as fully enclosed membrane water-cooled walls, good sealing, high thermal efficiency, strong load capacity, and no steel frame structure. They are favored and sought after by users. Corner tube hot water boilers have the characteristics of high efficiency and energy saving, and can be widely used in production processes in various industries and some heating places.

[0003] Most existing boilers use natural circulation, which has the problems of slow water speed, uneven water flow distribution, thermal deviation, and especially in the case of poor water quality, scale often adheres to the inner wall of the water pipe, affecting heat transfer and even the risk of pipe bursting. While increasing costs, it also affects the use of corner tube hot water boilers. Summary of the invention

[0004] The purpose of the present invention is to solve the problems of slow water speed, uneven water flow distribution and thermal deviation in existing boilers, especially when the water quality is poor, scale adheres to the inner wall of the water pipe, affecting heat transfer and even the risk of pipe bursting, and thus provide a forced water circulation structure for a hot water boiler.

[0005] The technical solution adopted by the present invention to solve the above problems is:

[0006] A forced water circulation structure of a hot water boiler, comprising an economizer, a connecting pipe, a boiler drum, a front downcomer, a rear downcomer, a front lower header, a rear lower header, a front water-cooled wall, a rear water-cooled wall, a front upper header, a rear upper header, a flue rear water-underwater header, a convection heating surface, a flue rear water-overwater header, an outlet pipe, a water outlet header, two side lower headers, two side water-cooled walls, two side upper headers, a plurality of side downcomers and a plurality of outlet pipes;

[0007] The economizer is installed in the flue outside the hot water boiler, the boiler drum is installed at the top of the boiler body, the economizer is connected to the boiler drum through a connecting pipe, the front lower header and the rear lower header are respectively installed at the front bottom end of the boiler body and the rear bottom end of the boiler body, the boiler drum is connected to the front lower header through the front downcomer, the boiler drum is connected to the rear lower header through the rear downcomer, the front upper header and the rear upper header are respectively installed at the top of the boiler body, the front lower header is connected to the front upper header through the front water-cooled wall, the rear lower header is connected to the rear upper header through the rear water-cooled wall, and the front upper header is connected to the The side downcomer is connected with a side lower header, the rear upper header is connected with the other side lower header through the side downcomer, the two side upper headers are installed at the top of the boiler furnace body, each side lower header is connected with the side upper header through the side water-cooled wall, each side upper header is connected with the flue rear underwater header through the lead-out pipe, the flue rear water upper header is installed at the top of the boiler furnace body, the convection heating surface is installed in the flue of the hot water boiler, the flue rear underwater header is connected with the flue rear water upper header through the convection heating surface, and the flue rear water upper header is connected with the outlet water header through the lead-out pipe.

[0008] Further, the connecting pipe is arranged higher than the side upper header, and the side upper header is located above the front upper header and the rear upper header.

[0009] Furthermore, the flue rear underwater header is located in the flue and above the rear lower header.

[0010] Furthermore, the plurality of side downcomers are symmetrically arranged on the left and right sides of the hot water boiler, and the two side lower headers, the two side water-cooled walls and the two side upper headers are all symmetrically arranged on the left and right sides of the hot water boiler.

[0011] Beneficial effects of the present invention:

[0012] 1. The forced circulating water process is adopted to solve the risk of natural circulation pipe bursting, and it also has a design that is suitable for SCR denitrification.

[0013] 2. The boiler adopts forced water circulation, which is reliable and effectively improves the water speed, avoiding the risks of scaling and tube burst caused by low water speed, water flow deviation, and uneven heating caused by natural circulation; at the same time, it has good power outage protection performance.

[0014] 3. This application adopts a forced circulation water circulation method, and the water circulation is safe and reliable. The water flow rate of all risers is controlled at 0.6-0.8m / s, including economizers, water-cooled walls, convection heating surfaces, etc. The water flow rate of all downcomers is controlled at 1.0-1.2m / s, including downcomers, connecting pipes, lead-out pipes, and export pipes. The boiler water-cooled wall adopts a membrane wall structure, and all uses upward flow of working fluid. A large boiler drum is provided on the upper part of the boiler to increase the water volume of the boiler, which can play a certain buffering role in the event of a sudden power outage. When there is a sudden power outage, the water in the boiler can rely on the weight pressure difference as a driving force to allow the water in the boiler to continue to circulate. Effective calculations and practice have proved that when there is a power outage, the working fluid in the boiler will not vaporize for 15 minutes. Within 15 minutes, the operating personnel have enough time to take countermeasures to prevent incidents of vaporization and water hammer caused by sudden power outages. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the main view of the overall structure of this application.

[0016] Figure 2 for Figure 1 Top view of the .

[0017] Figure 3 for Figure 1 Side cross-sectional view of .

[0018] Figure 4 for Figure 1 Side view of. DETAILED DESCRIPTION

[0019] Specific implementation method 1: Combination Figure 1-Figure 4The present embodiment is described. The forced water circulation structure of a hot water boiler described in the present embodiment comprises an economizer 1, a connecting pipe 2, a boiler drum 3, a front downcomer 4-1, a rear downcomer 4-2, a front lower header 5-1, a rear lower header 5-2, a front water-cooled wall 6-1, a rear water-cooled wall 6-2, a front upper header 7-1, a rear upper header 7-2, a flue rear water header 13, a convection heating surface 14, a flue rear water header 15, a derivation pipe 16, a water outlet header 17, two side lower headers The boiler drum 3 is installed at the top of the boiler body, and the economizer 1 is connected with the boiler drum 3 through the connecting pipe 2. The front lower header 5-1 and the rear lower header 5-2 are installed at the front bottom end of the boiler body and the rear bottom end of the boiler body respectively. The boiler drum 3 is connected with the front lower header 5-1 through the front downpipe 4-1, and the boiler drum 3 is connected with the front lower header 5-1 through the rear downpipe 4-1. The pipe 4-2 is connected to the rear lower header 5-2, the front upper header 7-1 and the rear upper header 7-2 are respectively installed at the top of the boiler body, the front lower header 5-1 is connected to the front upper header 7-1 through the front water-cooled wall 6-1, the rear lower header 5-2 is connected to the rear upper header 7-2 through the rear water-cooled wall 6-2, the front upper header 7-1 is connected to one side lower header 9 through the side downcomer 8, the rear upper header 7-2 is connected to the other side lower header 9 through the side downcomer 8, and the two side upper headers 11 are installed Installed at the top of the boiler furnace body, each side lower header 9 is connected with the side upper header 11 through the side water-cooled wall 10, each side upper header 11 is connected with the flue rear underwater header 13 through the lead-out pipe 12, the flue rear water upper header 15 is installed at the top of the boiler furnace body, the convection heating surface 14 is installed in the flue of the hot water boiler, the flue rear underwater header 13 is connected with the flue rear water upper header 15 through the convection heating surface 14, and the flue rear water upper header 15 is connected with the water outlet header 17 through the lead-out pipe 16.

[0020] Specific implementation method 2: Combination Figure 1-Figure 3 This embodiment describes a forced water circulation structure of a hot water boiler, in which the connecting pipe 2 is arranged higher than the side upper header 11, and the side upper header 11 is located above the front upper header 7-1 and the rear upper header 7-2. Other methods are the same as those of the first embodiment.

[0021] Specific implementation method three: Combination Figure 1 , Figure 2 This embodiment is described as a forced water circulation structure of a hot water boiler, in which the flue rear water lower header 13 is located in the flue and above the rear lower header 5-2. Other methods are the same as those of the second embodiment.

[0022] Specific implementation method four: Combination Figure 1 , Figure 2This embodiment is described. In this embodiment, a forced water circulation structure of a hot water boiler is described. A plurality of side downcomers 8 are symmetrically arranged on the left and right sides of the hot water boiler. Two side lower headers 9, two side water-cooled walls 10 and two side upper headers 11 are symmetrically arranged on the left and right sides of the hot water boiler. Other methods are the same as those of the third embodiment.

[0023] The water cycle process for this application is:

[0024] The return water first enters the economizer 1, and after being heated by the economizer 1, enters the boiler drum 3 through the connecting pipe 2. No internal devices such as partitions are set in the boiler drum 3. The next step is divided into two steps: one is to enter the front lower header 5-1 through the front downcomer 4-1; the other is to enter the rear lower header 5-2 through the rear downcomer 4-2.

[0025] The water entering the front lower header 5-1 is heated by the front water-cooled wall 6-1 and enters the front upper header 7-1;

[0026] The water entering the rear lower header 5-2 is heated by the rear water-cooled wall 6-2 and enters the rear upper header 7-2;

[0027] The water that has entered the front upper header 7 - 1 and the rear upper header 7 - 2 enters the side lower header 9 through the side downcomer 8 .

[0028] The water entering the side lower header 9 is heated by the side water-cooled wall 10 and then enters the side upper header 11 .

[0029] The water entering the side upper header 11 enters the flue rear underwater header 13 through the outlet pipe 12 .

[0030] The water entering the flue rear underwater header 13 enters the flue rear water header 15 after being heated by the convection heating surface 14 .

[0031] After entering the flue, the water in the water header 15 enters the water outlet header 17 through the outlet pipe 16, and is led out from the water outlet header 17 to the total water outlet heat network of the boiler for heating.

[0032] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. A forced water circulation structure for a hot water boiler, characterized in that: It comprises an economizer (1), a connecting pipe (2), a boiler drum (3), a front downcomer (4-1), a rear downcomer (4-2), a front lower header (5-1), a rear lower header (5-2), a front water-cooled wall (6-1), a rear water-cooled wall (6-2), a front upper header (7-1), a rear upper header (7-2), a flue rear water-underwater header (13), a convection heating surface (14), a flue rear water-underwater header (15), an outlet pipe (16), an outlet water header (17), two side lower headers (9), two side water-cooled walls (10), two side upper headers (11), a plurality of side downcomers (8) and a plurality of outlet pipes (12); The economizer (1) is installed in the flue outside the hot water boiler, the boiler drum (3) is installed at the top of the boiler furnace body, the economizer (1) is connected to the boiler drum (3) through a connecting pipe (2), the front lower header (5-1) and the rear lower header (5-2) are installed at the front bottom end of the boiler furnace body and the rear bottom end of the boiler furnace body respectively, the boiler drum (3) is connected to the front lower header (5-1) through a front downcomer (4-1), the boiler drum (3) is connected to the rear lower header (5-2) through a rear downcomer (4-2), the front upper header (7-1) and the rear upper header (7-2) are installed at the top of the boiler furnace body respectively, the front lower header (5-1) is connected to the front upper header (7-1) through a front water-cooled wall (6-1), the rear lower header (5-2) is connected to the rear upper header (7-2) through a rear water-cooled wall (6-2), The front upper header (7-1) is connected to a side lower header (9) through a side downcomer (8), and the rear upper header (7-2) is connected to the other side lower header (9) through a side downcomer (8). The two side upper headers (11) are installed at the top of the boiler furnace body. Each side lower header (9) is connected to the side upper header (11) through a side water-cooled wall (10). Each side upper header (11) is connected to a flue rear underwater header (13) through an outlet pipe (12). A flue rear water upper header (15) is installed at the top of the boiler furnace body. A convection heating surface (14) is installed in the flue of the hot water boiler. The flue rear underwater header (13) is connected to the flue rear water upper header (15) through the convection heating surface (14). The flue rear water upper header (15) is connected to a water outlet header (17) through an outlet pipe (16).

2. The forced water circulation structure of a hot water boiler according to claim 1, characterized in that: The connecting pipe (2) is arranged higher than the side upper header (11), and the side upper header (11) is located above the front upper header (7-1) and the rear upper header (7-2).

3. The forced water circulation structure of a hot water boiler according to claim 1, characterized in that: The flue rear underwater header (13) is located in the flue and above the rear lower header (5-2).

4. The forced water circulation structure of a hot water boiler according to claim 1, characterized in that: A plurality of side downcomers (8) are symmetrically arranged on the left and right sides of the hot water boiler, and two side lower headers (9), two side water-cooled walls (10) and two side upper headers (11) are all symmetrically arranged on the left and right sides of the hot water boiler.

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