A blowdown structure for a waste heat boiler steam-water system

Abstract

This utility model discloses a blowdown structure for a waste heat boiler steam-water system, including an evaporator, an economizer, and a steam drum. Multiple blowdown pipes are fixedly connected to the bottom of the evaporator's inlet header. Each blowdown pipe is connected to a first valve, and all blowdown pipes converge on a single main discharge pipe. This main discharge pipe is made of a conventional material with high heat exchange efficiency, and an L-shaped heat exchange tube is welded to its outer circumference. The outlet end of the main discharge pipe extends from the end of the L-shaped heat exchange tube, and the connection between the two is welded and sealed. This utility model provides good blowdown performance and fully utilizes the thermal energy of the wastewater.

Description

Technical Field

[0001] This utility model relates to the field of waste heat boiler technology, specifically to a waste heat steam-water system's sewage discharge structure. Background Technology

[0002] Waste heat boiler steam-water systems are mainly used to recover and utilize waste heat from industrial processes. Their structure typically includes a steam drum, riser pipes, downcomer pipes, economizer, and evaporator. Boiler feedwater first enters the economizer, where it absorbs heat and heats up to a temperature below the saturation temperature under bubble pressure before entering the boiler drum. The water entering the drum mixes with the saturated water already there and then flows downcomer pipes into the evaporator to absorb heat and begin steam production. Waste heat boiler steam-water systems require regular blowdown to remove impurities and deposits, prevent scaling which increases energy consumption, and maintain water quality. A common blowdown method involves setting up dedicated blowdown points, usually located at the lowest point of the boiler. However, in practice, the blowdown effect is limited, and significant heat loss is easily incurred during blowdown. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a reasonable sewage discharge structure for a waste heat boiler steam-water system. This sewage discharge structure not only does not cause heat loss, but also has a good sewage discharge effect.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A waste heat boiler steam-water system's blowdown structure includes an evaporator, an economizer, and a steam drum. The system is characterized by multiple blowdown pipes fixedly connected to the bottom of the evaporator's inlet header. Each blowdown pipe is connected to a first valve, and all blowdown pipes converge onto a single main discharge pipe. This main discharge pipe is made of a conventional material with high heat exchange efficiency, and an L-shaped heat exchange tube is welded to its outer circumference. The outlet end of the main discharge pipe extends from the end of the L-shaped heat exchange tube, and the connection between the two is welded and sealed. One end of the L-shaped heat exchange tube is connected to a water inlet pipe, and the other end is connected to the economizer's inlet header.

[0006] Preferably, a pressurized flushing water delivery pipe is connected to the outlet header of the evaporator, one end of which extends outside the boiler and is connected to a pressurized pump.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0008] This invention directly fixes multiple drain pipes to the bottom of the evaporator inlet header (located below), resulting in good drainage. The sewage in the drain pipes is collected into the same main discharge pipe wrapped with heat exchange tubes. Through heat exchange with the inlet water passing through the heat exchange tubes, the water temperature entering the economizer inlet header is increased, making full use of the thermal efficiency of the drained sewage. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0010] The present invention will now be further described with reference to the accompanying drawings. Any parts not detailed below are based on existing technology in the field.

[0011] like Figure 1 As shown, the waste heat boiler steam-water system of this utility model includes an evaporator 1 with one or more stages, an economizer 2 with one or more stages, and a steam drum 3. At least one drain pipe 4 is fixedly connected to the bottom of the inlet header 1.1 of each evaporator 1. Each drain pipe 4 is connected to a first valve 5, and all the drain pipes 4 of the evaporators 1 eventually converge on the same main discharge pipe 6. The main discharge pipe 6 is made of conventional high heat exchange rate material, and an L-shaped heat exchange tube 7 (made of conventional low heat exchange rate material) is welded to the outer periphery of the main discharge pipe 6. The outlet end of the main discharge pipe 6 extends from the end of the L-shaped heat exchange tube 7, and the connection between the two is welded and sealed. One end of the L-shaped heat exchange tube 7 is connected to the water inlet pipe 8, and the other end is connected to the inlet header 2.1 of the economizer 2.

[0012] A second valve 9 is fixedly connected to each pipe connecting the evaporator 1 and the steam drum 3. A pressurized flushing water delivery pipe 10 is connected to the outlet header 1.2 of each stage evaporator 1. One end of the pressurized flushing water delivery pipe 10 extends outside the boiler 12, and a pressurized pump 11 is connected to the outer end of the pressurized flushing water delivery pipe. After the sludge is discharged through its respective drain pipe, the pressurized pump 11 and the pressurized flushing water delivery pipe 10 flush each stage evaporator 1 from top to bottom to reduce scale formation.

Claims

1. A blowdown structure for a waste heat boiler steam-water system, comprising an evaporator, an economizer, and a steam drum, characterized in that, Multiple drain pipes are fixedly connected to the bottom of the evaporator inlet header. Each drain pipe is connected to a first valve, and all drain pipes converge on the same main discharge pipe. The main discharge pipe is made of a conventional material with high heat exchange rate, and an L-shaped heat exchange tube is welded to the outer periphery of the main discharge pipe. The outlet end of the main discharge pipe extends from the end of the L-shaped heat exchange tube, and the connection between the two is welded and sealed. One end of the L-shaped heat exchange tube is connected to the water inlet pipe, and the other end is connected to the economizer inlet header.

2. The blowdown structure of the waste heat boiler steam-water system according to claim 1, characterized in that, A pressurized flushing water delivery pipe is connected to the outlet header of the evaporator. One end of the pressurized flushing water delivery pipe extends out of the boiler and is connected to a pressurized pump.

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