CN106765033A - A kind of boiler blow-off heat reclaim unit - Google Patents

Abstract

The invention relates to a heat recovery device for boiler blowdown, which comprises a fixed-row expansion vessel, and a sewage main pipe is arranged on the lower side of the fixed-row expansion vessel. A through hole is provided on the sewage main pipe inside the tank body of the expansion container, and a casing is provided outside the main sewage pipe inside the tank body. The fixed discharge expansion container is also provided with a water spray cooling structure. An external cold source, the top of the fixed-row expansion vessel is provided with a steam release port, and the bottom is provided with a water discharge port. The inner wall of the fixed-row expansion vessel is provided with a spiral tube bundle designed for suspension of spiral tubes, and the cold source is heated by surface heat exchange to recover low-pressure saturated water and steam heat. There is a through hole on the sewage main pipe in the tank of the fixed-row expansion vessel. Inside the tank There is a casing outside the sewage main pipe, that is, a honeycomb decompression and noise reduction structure with double-layer decompression in the form of a decompression muffler, so that the sewage pipe adopts a honeycomb pressure relief method.

Description

A boiler blowdown heat recovery device

technical field

The invention belongs to the technical field of boiler blowdown, in particular to a boiler blowdown heat recovery device.

Background technique

In order to ensure the quality of boiler water so that the boiler can operate stably and safely for a long time, the boiler must carry out continuous blowdown and regular blowdown. After the continuous blowdown passes through flash evaporation, the low-pressure steam generated is recycled to the deaerator for heating, and the hot water is discharged to the fixed discharge expansion vessel. , Regular sewage discharge directly to the fixed discharge expansion container, after the fixed discharge expansion container is subjected to secondary expansion and pressure relief, steam is discharged to the atmosphere, high temperature water is mixed with cold water for secondary cooling, and then discharged to the waste water pool. There are a lot of impurities and drugs in the discharge water. The cost of water recovery to the boiler is relatively high.

This is the weak point of prior art.

Therefore, in view of the defects in the prior art, it is very necessary to provide a boiler blowdown heat recovery device to solve the above technical problems.

Contents of the invention

The object of the present invention is to provide a boiler blowdown heat recovery device to solve the above technical problems, which can not only reduce steam discharge, but also reduce water waste. Consumption, but also can recover heat.

In order to achieve the above object, technical scheme of the present invention is:

A heat recovery device for boiler blowdown, comprising a fixed-row expansion vessel, a sewage main pipe is arranged on the lower side of the fixed-row expansion vessel, and it is characterized in that: the inner wall of the fixed-row expansion vessel is provided with a heat exchanger, and the fixed-row expansion vessel The sewage main pipe in the tank is provided with a through hole, and a casing is arranged outside the sewage main pipe in the tank body of the fixed-discharge expansion vessel. The fixed-discharge expansion vessel is also provided with a water spray cooling structure, and the heat exchanger is connected to an external cold source , the top of the fixed-row expansion container is provided with a steam release port, and the bottom is provided with a water discharge port.

Preferably, the heat exchanger is a helical tube bundle with a helical tube suspension design, and the helical tube bundle is attached to the inner wall of the fixed-row expansion vessel. This design method can eliminate thermal expansion and enhance impact resistance.

The water spray cooling structure is a water spray pipe, and a valve is arranged on the water spray pipe.

Beneficial effects of the present invention:

The heat recovery device for boiler blowdown provided by the present invention is provided with a spiral tube bundle designed to hang spiral tubes on the inner wall of the fixed-row expansion vessel, heats the cold source through surface heat exchange, and performs low-pressure saturated water and steam heat recovery. There is a through hole on the sewage main pipe in the tank, and a casing is provided outside the sewage main pipe in the tank, that is, a honeycomb decompression and noise reduction structure in the form of a decompression muffler is adopted, so that the sewage pipe adopts a honeycomb pressure relief The above-mentioned cold source adopts a bypass design, which is convenient for maintenance. This design can recover the heat of saturated water and steam in the fixed row expansion vessel, reduce the overall energy consumption of the system, reduce the release of steam to the air, improve the comprehensive utilization of water, reduce the temperature of the expansion vessel and drainage piping system, and reduce the use of expansion cooling water .

In addition, the design principle of the present invention is reliable, the structure is simple, and has very wide application prospects.

It can be seen that, compared with the prior art, the present invention has outstanding substantive features and remarkable progress, and the beneficial effects of its implementation are also obvious.

Description of drawings

Fig. 1 is a structural schematic diagram of a boiler blowdown heat recovery device provided by the present invention.

Among them, 1-fixed discharge expansion vessel, 2-sewage main pipe, 3-heat exchanger, 4-casing, 5-water spray cooling structure, 6-external cold source, 7-steam release port, 8-water outlet.

detailed description

The present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments.

As shown in Figure 1, a boiler blowdown heat recovery device provided by the present invention includes a fixed-row expansion vessel 1, a sewage main pipe 2 is arranged on the lower side of the fixed-row expansion vessel, and a heat exchanger is arranged on the inner wall of the fixed-row expansion vessel 3. A through hole is provided on the sewage main pipe in the tank body of the fixed-row expansion vessel, and a casing 4 is arranged outside the sewage main pipe in the tank body. The fixed-row expansion vessel is also provided with a water spray cooling structure 5, The heat exchanger is connected to an external cold source 6, and the top of the fixed row expansion vessel is provided with a steam release port 7 and a water discharge port 8 at the bottom.

In this embodiment, the heat exchanger is a spiral tube bundle designed with spiral tube suspension. This design method can eliminate thermal expansion and enhance impact resistance.

Through the transformation of the fixed-row expansion vessel, the inner wall is added with a spiral tube bundle to absorb the heat of saturated steam in the vessel without reducing the internal volume of the expansion vessel.

After more than half a year of actual operation, the operation is stable, which proves that the implementation effect of the project is good and meets the design requirements.

1. Heat recovery:

Condensate temperature enthalpy difference * water volume / standard coal heat * unit price = about 100,000 yuan/year.

2. Kinetic energy cost:

The water pressure potential energy is converted and ignored.

After being put into use, it can effectively reduce the amount of cooling water input, reduce the kinetic energy cost at this point, and greatly reduce the discharge of saturated steam. Under the same circumstances, the temperature of sewage discharge will drop, and the temperature of deoxygenated water will rise.

The above disclosure is only a preferred embodiment of the present invention, but the present invention is not limited thereto, any non-creative changes that those skilled in the art can think of, and some improvements and modifications made without departing from the principle of the present invention , should fall within the protection scope of the present invention.

Claims (2)

1. a kind of boiler blow-off heat reclaim unit, including determine row's flash vessel, flash vessel downside is arranged surely is provided with blowdown main, its It is characterised by：Described row's flash vessel inwall of determining is provided with heat exchanger, on the blowdown main in the flash vessel tank body of row surely Through hole is provided with, sleeve pipe is provided with outside the blowdown main in the flash vessel tank body of row surely, this arranges flash vessel and is additionally provided with spray surely Water desuperheat structure, described heat exchanger connection external source, the top of row's flash vessel surely is provided with steam releasing mouthful, described fixed Row's flash vessel bottom is provided with dewatering outlet.

2. a kind of boiler blow-off heat reclaim unit according to claim 1, it is characterised in that：The heat exchanger is use The helical bundle of helix tube suspension design.