Drain waste heat utilization system for boiler drum continuous blowdown flash tank

Abstract

The utility model discloses a boiler drum continuous blowdown flash tank drainage waste heat utilization system which comprises a continuous blowdown flash tank, a 01C heat exchange station heater and a bypass pipeline, the continuous blowdown flash tank is provided with a drainage outlet and connected to one side of the 01C heat exchange station heater through a pipeline, and the other side of the 01C heat exchange station heater is connected with the bypass pipeline. The bypass pipeline is connected with a fixed drainage flash tank and is connected to a fixed drainage cooling pool, and the fixed drainage cooling pool is provided with a fixed drainage pump and is connected with an open water forebay; high-temperature drain water of the continuous blowdown flash tank is subjected to heat exchange through a 01C heater and then is discharged to a fixed-drainage cooling pool, the drain water is recycled to an open type water forebay through a fixed-drainage pump, and heated circulating water can be used for heating living quarters and domestic hot water, so that waste heat recycling and countercurrent flow heat exchange with the circulating water are realized, the drain water temperature is reduced to 80 DEG C from 115 DEG C, and the circulating water temperature is increased by 2.37 DEG C. The utility model belongs to the field of waste heat recovery, and particularly relates to a drainage waste heat utilization system for a boiler drum continuous blowdown flash tank.

Description

Technical Field

[0001] This utility model belongs to the field of waste heat recovery, specifically referring to a waste heat utilization system for the drainage of a boiler drum expansion vessel. Background Technology

[0002] Continuous blowdown of boilers is one of the losses in the operation of steam drum boilers. In order to control the quality of boiler water and steam, boilers must carry out continuous blowdown, which requires continuously discharging a portion of boiler water from the part with the highest salt and alkali concentration to reduce the salt content, alkali content, silica content and suspended slag content in the boiler water.

[0003] The boiler drum blowdown process first involves a small amount of heat recovery via simple flash evaporation in the continuous blowdown expansion vessel and then to the deaerator. The majority of the heat is then directly discharged into the continuous blowdown cooling pool after depressurization and expansion in the fixed blowdown expansion vessel, resulting in a huge waste of heat resources. Utility Model Content

[0004] The technical problem this invention aims to solve is that directly discharging condensate into a cooling pool via a fixed-discharge expansion container easily leads to a waste of heat source.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows: The boiler drum continuous blowdown expansion container condensate waste heat utilization system proposed by this utility model includes a continuous blowdown expansion container, a 01C heat exchange station heater, and a bypass pipeline. The continuous blowdown expansion container is provided with a condensate outlet and is connected to one side of the 01C heat exchange station heater through a pipeline. The other side of the 01C heat exchange station heater is connected to the bypass pipeline. The bypass pipeline is connected to a fixed blowdown expansion container and connected to a fixed blowdown cooling pool. The fixed blowdown cooling pool is provided with a fixed drainage pump and is connected to an open water forebay.

[0006] Furthermore, the bypass pipeline is connected to the auxiliary steam header and the spare pipelines of heat exchangers 01A and 01B.

[0007] Furthermore, the heater of the 01C heat exchange station is a stainless steel corrugated shell structure with a designed heat exchange capacity of ≥500kW and a pressure drop on the condensate side of <0.1MPa.

[0008] Furthermore, the condensate outlet is equipped with a temperature sensor and an electric regulating valve, forming a closed-loop control. When the condensate temperature is >80℃, the flow rate is increased; when the temperature is ≤80℃, the flow rate is switched to a bypass pipeline for direct discharge to the fixed discharge cooling tank.

[0009] Furthermore, the bypass pipeline is equipped with a manual gate valve and a check valve, with a flow rate of 20-30% of the total drainage volume.

[0010] Furthermore, the heater inlet of the 01C heat exchange station is equipped with an online filter with a filtration accuracy of ≤50μm and is made of 316L stainless steel.

[0011] The beneficial effects of this utility model by adopting the above structure are as follows:

[0012] 1. The boiler drum exhaust expansion vessel waste heat utilization system proposed in this solution achieves an adaptive energy supply mode with waste heat as the main source and auxiliary steam as the auxiliary source through temperature-pressure interlock control, thus avoiding energy waste.

[0013] 2. The boiler drum exhaust expansion tank waste heat utilization system proposed in this plan is a system that utilizes existing equipment to reduce investment costs. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the system flow of this utility model.

[0015] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0017] like Figure 1 As shown, this utility model proposes a boiler drum continuous blowdown expansion tank condensate waste heat utilization system, including a continuous blowdown expansion tank, a 01C heat exchange station heater, and a bypass pipeline. The continuous blowdown expansion tank is equipped with a condensate outlet, which is connected to one side of the 01C heat exchange station heater via a pipeline. The other side of the 01C heat exchange station heater is connected to the bypass pipeline. The bypass pipeline is connected to a fixed blowdown expansion tank and then to a fixed blowdown cooling tank. The fixed blowdown cooling tank is equipped with a fixed drainage pump and connected to an open forewater tank. The condensate outlet is equipped with a temperature sensor and an electric regulating valve, forming a closed-loop control. When the condensate temperature... When the temperature is >80℃, increase the flow rate; when the temperature is ≤80℃, switch to the bypass pipeline for direct discharge to the fixed discharge cooling tank. The bypass pipeline is equipped with a manual gate valve and a check valve, and the flow rate is 20-30% of the total condensate volume. The high-temperature condensate from the continuous discharge expansion tank is discharged to the fixed discharge cooling tank after heat exchange with the 01C heater. The condensate is then recycled to the open water forebay by the fixed discharge pump. The heated circulating water can be used for heating and domestic hot water in the living area, thereby realizing the recovery and utilization of waste heat. The condensate temperature drops from 115℃ to 80℃ and the circulating water temperature increases by 2.37℃.

[0018] The bypass pipeline connects to the auxiliary steam header and the backup pipelines for heat exchangers 01A and 01B. When the circulating water temperature falls below the set threshold, the auxiliary steam automatically starts to replenish heat, ensuring heating stability. The heater in heat exchange station 01C is a stainless steel corrugated shell-and-tube structure with a designed heat exchange capacity of ≥500kW and a condensate-side pressure drop of <0.1Mpa. An online filter with a filtration accuracy of ≤50μm and made of 316L stainless steel is installed at the heater inlet of heat exchange station 01C to intercept suspended solids and ionic impurities, preventing scaling and corrosion.

[0019] In practical use, the condensate from the boiler's continuous blowdown expansion vessel is introduced into the 01C heater of the 01 heat exchange station, where it undergoes counter-current heat exchange with the circulating water in the 01C heater. After heat exchange in the 01C heater, the high-temperature condensate from the continuous blowdown expansion vessel is discharged to the fixed-discharge cooling pool. The condensate is then recycled to the open forewater pool via a fixed-discharge pump. The heated circulating water can be used for heating and domestic hot water in the living area, thus realizing the recovery and utilization of waste heat.

[0020] The heated circulating water in the heat exchange station can be used as hot water for the living area and for heating purposes. When the heating requirements cannot be met, auxiliary steam is introduced to the 01A and 01B heat exchangers for heating.

[0021] By changing the drainage recovery path of the continuous blowdown expansion tank and utilizing the high-temperature drainage heat of the continuous blowdown expansion tank, the ambient temperature of the boiler room is improved, while the heat source loss of the boiler is reduced. The waste heat from the drainage of the continuous blowdown expansion tank is recovered, and the steam consumption required for the circulating water of the auxiliary steam heating 01 heat exchange station is reduced, which can reduce operating costs and has significant economic and environmental benefits.

[0022] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A boiler drum continuous blowdown flash tank system for utilizing the waste heat of the blowdown water, characterized in that, Comprise: Continuous expansion vessel, 01C heat exchange station heater, bypass pipeline, the continuous expansion vessel is provided with a drain outlet, and is connected to one side of the 01C heat exchange station heater through a pipeline, the other side of the 01C heat exchange station heater is connected to the bypass pipeline, the bypass pipeline is connected with a constant expansion vessel and is connected to a constant discharge cooling pool, the constant discharge cooling pool is provided with a constant discharge water pump and is connected with an open water forebay.

2. The system for utilizing the drainage and waste heat of a boiler drum continuous-discharge expansion vessel according to claim 1, characterized in that: The bypass pipeline is connected with an auxiliary steam main pipe and a standby pipeline of 01A and 01B heat exchangers.

3. The system according to claim 2, wherein the system is characterized by: The 01C heat exchange station heater is a stainless steel corrugated pipe shell structure, the design heat exchange capacity is greater than or equal to 500kW, and the drain side pressure drop is less than 0.1MPa.

4. The system for utilizing the drainage and waste heat of a boiler drum continuous-discharge expansion vessel according to claim 3, characterized in that: The drain outlet is provided with a temperature sensor and an electric regulating valve, and forms a closed loop control, when the drain temperature is greater than 80℃, the flow is increased, and when the temperature is less than or equal to 80℃, it is switched to the bypass pipeline to be directly discharged to the constant discharge cooling pool.

5. The system according to claim 4, characterized in that: The bypass pipeline is provided with a hand-operated gate valve and a check valve, and the flow is 20-30% of the total drain amount.

6. The system for utilizing the drainage and waste heat of a boiler drum continuous-discharge expansion vessel according to claim 5, characterized in that: The inlet of the 01C heat exchange station heater is provided with an online filter, the filtering precision is less than or equal to 50μm, and the material is 316L stainless steel.

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