CN211290011U - System for waste heat utilization of boiler fixed-row flash tank and deaerator - Google Patents

Abstract

The utility model discloses a system for boiler fixed-row flash tank and deaerator waste heat utilization, the system comprises a boiler fixed-row flash tank and a deaerator, a coil heat exchanger is coiled outside the boiler fixed-row flash tank from top to bottom; one end of the coil heat exchanger is connected with the water pump, and the other end of the coil heat exchanger is connected with the inner pipe; the inner pipe is connected with a heating system; an outer sleeve is arranged outside the inner pipe; one end of the outer sleeve is connected with the soft water tank through a condensed water pipe; the soft water tank is connected with the deaerator through a soft water pump; the deaerator is provided with an exhaust pipe; the steam exhaust pipe is connected with the other end of the outer sleeve. The utility model discloses carry out recycle with the waste heat of boiler flash tank and oxygen-eliminating device surely, improved boiler system's thermal efficiency, reduce energy consumption.

Description

A system for the utilization of waste heat of boiler fixed row expansion vessel and deaerator

technical field

The utility model relates to the technical field of boiler waste heat utilization, in particular to a system for waste heat utilization of boiler fixed-discharge expansion containers and deaerators.

Background technique

During the normal operation of the boiler, with the continuous circulation and evaporation of the boiler water, the impurity concentration of the boiler water will gradually increase. In order to ensure that the salt content of the pot water is within the allowable range, part of the pot water with high salt concentration must be discharged. There are two types of boiler blowdown: continuous blowdown and regular blowdown. After the continuous blowdown is flashed, the low-pressure steam is generated and sent to the deaerator for heating. The hot water is discharged to the fixed discharge and expansion vessel. The fixed discharge and expansion vessel is subjected to secondary pressure reduction and expansion. The steam is discharged from the upper outlet, and the sewage is discharged into the trench from the lower sewage outlet. At present, the secondary steam is directly discharged into the atmosphere, which has a certain impact on the environment and also causes a large amount of heat loss. In the normal operation of the deaerator, in most cases, the output of deaerator steam will be greater than its consumption, and the excess deaerator steam will be discharged into the atmosphere from the vent of the deaerator, resulting in a waste of resources.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides a system for the utilization of waste heat of a boiler fixed-discharge expansion vessel and a deaerator, which can realize the effective recovery of heat energy and water, thereby improving the thermal efficiency of the boiler system and reducing energy consumption. consume.

The utility model is achieved through the following technical solutions:

The utility model provides a system for utilizing the waste heat of a boiler fixed-row expansion container and a deaerator. The system comprises a coil heat exchanger coiled on the outside of the fixed-row expansion container; one end of the coil heat exchanger is connected to the The water return end is connected, and the other end is connected with the inner pipe; the inner pipe is connected with the heating system; the inner pipe is provided with an outer casing; one end of the outer casing is connected with the soft water tank through the condensation water pipe; the outer casing The other end is connected with the deaerator through the exhaust steam pipe; the soft water tank is connected with the deaerator.

Preferably, the coil heat exchanger is wound on the outer wall of the fixed-row expansion container from top to bottom. The flow direction of the return water in the heat exchange tube is opposite to the flow direction of the steam and hot water in the fixed row expansion container, which can increase the heat exchange efficiency.

Preferably, the water return end is provided with a water pump.

Preferably, both ends of the outer sleeve are closed.

Preferably, the outer casing is provided with an air inlet end and a water outlet end, the air inlet end is connected with the spent steam pipe, and the water outlet end is connected with the condensate water pipe. After the steam enters the outer casing, the flow direction is opposite to the flow direction of the return water in the inner pipe, which is beneficial to the heat exchange between the steam and the return water and increases the heat exchange efficiency.

Preferably, a trap is provided on the condensate pipe. Traps ensure that condensate, rather than under-heated steam, enters the condensate line.

Preferably, the soft water tank and the deaerator are connected by a pipeline, and a soft water pump is provided on the pipeline.

The beneficial effects of the present utility model are:

The utility model recovers and utilizes the heat of the fixed-discharge expansion vessel, and also recovers and utilizes the heat and water of the deaerator. The system jointly improves the thermal efficiency of the boiler system and reduces the energy consumption in multiple aspects.

Description of drawings

FIG. 1 is a schematic diagram of the system structure of the present invention.

As shown in the picture: 1 soft water tank, 2 water pump, 3 deaerator, 4 fixed discharge container, 5 coil heat exchanger, 6 condensate water pipe, 7 inner pipe, 8 outer casing, 9 exhausted steam pipe, 10 soft water pump .

Detailed ways

In order to clearly illustrate the technical features of the solution, the solution will be described below through specific implementations.

Example

A system for waste heat utilization of boiler fixed-row expansion container and deaerator, the system includes a coil heat exchanger 5 coiled outside the fixed-row expansion container 4; one end of the coil heat exchanger 5 is connected to the return The water end is connected, and the other end is connected with the inner pipe 7; the inner pipe 7 is connected with the heating system; the inner pipe 7 is provided with an outer casing 8; one end of the outer casing 8 is connected to the soft water tank 1 through the condensation water pipe 6 connection; the other end of the outer casing 8 is connected to the deaerator 3 through the exhaust steam pipe 9; the soft water tank 1 is connected to the deaerator 3. The water return end is provided with a water pump 2 , which can pump the return water into the coil heat exchanger 5 . Both ends of the outer sleeve 8 are closed, the outer sleeve is provided with an air inlet end and a water outlet end, the air inlet end is connected with the exhaust steam pipe 9 , and the water outlet end is connected through the condensate water pipe 6 . The hot steam in the deaerator 3 enters the outer casing 8 through the spent steam pipe 9, and conducts countercurrent heat exchange with the inner pipe 7 of the outer casing 8 to further heat the return water in the inner pipe 7, and then the steam in the outer casing 8 passes through The heat exchange is condensed into water, which flows into the condensed water pipe 6 from the water outlet. The condensate pipe 6 is provided with a trap to ensure that steam will not enter the condensate pipe 6 . The soft water tank 1 and the deaerator 3 are connected by a pipeline, and a soft water pump 2 is arranged on the pipeline, and the water in the soft water tank 1 can be pumped into the deaerator 3 for the deaerator 3 to use.

During normal operation, the heating return water from the boundary area is sent to the coil heat exchanger 5 through the water pump 2, and the sewage from the boiler enters the fixed discharge expansion container 4 to realize the separation of steam and water, producing saturated steam and waste water at about 100 °C. After the saturated steam exchanges heat with the return water, it becomes condensed water and merges into the waste hot water. The preliminarily heated return water enters the inner pipe 7, and the deoxidized deaerated steam discharged from the deaerator 3 enters the outer casing 8 through the exhausted steam pipe 9. The steam in the outer casing 8 moves in the opposite direction to the return water in the inner pipe, and passes through the countercurrent flow. The heat exchange further increases the temperature of the return water in the inner pipe 7 , and the higher temperature return water supplies heat to the heating system through the inner pipe 7 . The steam in the outer casing 8 exchanges heat with the return water in the inner pipe and then becomes condensed water, which enters the soft water tank 1 through the condensed water pipe 6 . The water in the soft water tank 1 is pumped into the deaerator 3 through the soft water pump 10 connected to the soft water tank 1 for recycling.

Of course, the above description is not limited to the above examples, and the undescribed technical features of the present invention can be realized by or using the existing technology, and will not be repeated here; the above embodiments and accompanying drawings are only used to illustrate the technology of the present invention. The solution is not intended to limit the present utility model. The present utility model is described in detail with reference to the preferred embodiments. Those of ordinary skill in the art should understand that the Changes, modifications, additions or substitutions do not depart from the purpose of the present invention, and should also belong to the protection scope of the claims of the present invention.

Claims (7)

1. a system for the utilization of waste heat of boiler fixed row expansion vessel and deaerator, characterized in that the system comprises a coil heat exchanger coiled around the fixed row expansion vessel; One end is connected with the return water end, and the other end is connected with the inner pipe; the inner pipe is connected with the heating system; the inner pipe is provided with an outer casing; one end of the outer casing is connected with the soft water tank through the condensation water pipe; the The other end of the outer casing is connected with the deaerator through the exhaust steam pipe; the soft water tank is connected with the deaerator. 2 . The waste heat utilization system according to claim 1 , wherein the coil heat exchanger is wound on the outer wall of the fixed-row expansion vessel from top to bottom. 3 . 3 . The waste heat utilization system according to claim 1 , wherein a water pump is provided at the water return end. 4 . 4 . The waste heat utilization system according to claim 1 , wherein both ends of the outer sleeve are closed. 5 . 5 . The system for utilizing waste heat according to claim 1 , wherein the outer casing is provided with an air inlet end and a water outlet end, the air inlet end is connected with a spent steam pipe, and the water outlet end is connected with a condensate water pipe. 6 . . 6 . The waste heat utilization system according to claim 1 , wherein a trap is provided on the condensate pipe. 7 . 7 . The waste heat utilization system according to claim 1 , wherein the soft water tank and the deaerator are connected by a pipeline, and a soft water pump is provided on the pipeline. 8 .

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