CN-122015075-A - Emergency water supplementing system for waste heat boiler

CN122015075ACN 122015075 ACN122015075 ACN 122015075ACN-122015075-A

Abstract

The invention discloses an emergency water supplementing system for a waste heat boiler, and relates to the field of industrial waste heat recovery. The emergency water replenishing system for the waste heat boiler comprises a water replenishing tank, a softened water tank, a main water replenishing unit, an emergency water replenishing unit and a control unit. This an emergent moisturizing system for exhaust-heat boiler is through outside main moisturizing unit, parallel arrangement one set of complete and independent emergent moisturizing unit of structure to with control unit collaborative work, constructed redundant moisturizing footpath, when main moisturizing footpath is inefficacy because of the trouble, and when the emergent moisturizing trigger water level that moisturizing tank liquid level falls to lower than main moisturizing start-up threshold value, control unit can this emergency of automatic identification and start emergent moisturizing unit and carry out quick moisturizing, and then solved the paralyzed problem of whole moisturizing system of prior art because of single fault point, promoted the overall reliability of exhaust-heat boiler feed water system, ensured system safety.

Inventors

LI LANYU
TANG YIPING
LI QIUMING
WANG DECHANG
GUO HAIDING
ZHANG YONG
HAN BO
YANG YANG

Assignees

广东广青金属压延有限公司
广东广青金属科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260309

Claims (10)

1. An emergency water replenishing system for a waste heat boiler, comprising: A water supplementing tank (1) for storing and supplying water to the waste heat boiler; A softened water tank (2) for storing softened water; A main water replenishing unit (10) comprising a main water replenishing pump (11) and a main water replenishing pipe (12), wherein the main water replenishing pipe (12) is connected between the softened water tank (2) and the water replenishing tank (1); The emergency water supplementing unit (20) is arranged in parallel with the main water supplementing unit (10) and comprises an emergency water supplementing pump (21) and an emergency water supplementing pipeline (22), one end of the emergency water supplementing pipeline (22) is connected to the softened water tank (2), and the other end of the emergency water supplementing pipeline is connected to the water supplementing tank (1); The control unit (30) is in signal connection with the water level sensor (3) arranged on the water supplementing tank (1) and is used for monitoring the liquid level of the water supplementing tank (1), and the control unit (30) is configured to automatically start the emergency water supplementing unit (20) to supplement water to the water supplementing tank (1) when the liquid level of the water supplementing tank (1) is lower than an emergency water supplementing trigger water level of a main water supplementing start threshold.
2. The emergency water replenishing system for the waste heat boiler according to claim 1, wherein the emergency water replenishing unit (20) further comprises a control valve (23) arranged on the emergency water replenishing pipeline (22), and when the control unit (30) starts the emergency water replenishing unit (20), the control valve (23) is synchronously controlled to be started and the emergency water replenishing pump (21) is synchronously controlled to be started.
3. The emergency water replenishing system for the waste heat boiler according to claim 2, wherein the control unit (30) is a programmable logic controller, a first water level threshold value L1 and a second water level threshold value L2 are preset in the control unit (30), the first water level threshold value L1 is the main water replenishing starting threshold value, the second water level threshold value L2 is the emergency water replenishing triggering water level lower than L1, when the liquid level is lower than L1, the control unit (30) preferentially starts the main water replenishing unit (10), and when the liquid level is lower than L2, the control unit (30) judges that a main water replenishing path fails and starts the emergency water replenishing unit (20).
4. An emergency water replenishing system for a waste heat boiler according to claim 3, wherein the control unit (30) further comprises a fault judging module (31) for receiving an operation state signal of the main water replenishing pump (11) or a pressure signal of the main water replenishing pipe (12), and when the water replenishing tank (1) liquid level is lower than L1 and the fault judging module (31) judges that the main water replenishing unit (10) has a fault, the control unit (30) directly starts the emergency water replenishing unit (20).
5. An emergency water replenishing system for a waste heat boiler according to claim 2, further comprising an interlock module (40), said interlock module (40) being connected to said control unit (30) for effecting an operational interlock between said main water replenishing pump (11) and said emergency water replenishing pump (21) such that both cannot be operated simultaneously.
6. The emergency water replenishment system for a waste heat boiler of claim 5, wherein the interlock logic of the interlock module (40) is configured to ensure operation of the main water replenishment unit (10) in a preferential manner, and to restart the main water replenishment unit (10) after the emergency water replenishment unit (20) is started if the main water replenishment unit (10) fails to be removed and a start request is received, waiting for the emergency water replenishment unit (20) to stop operating.
7. Emergency water replenishment system for a waste heat boiler according to claim 2, characterized in that the emergency water replenishment pump (21) is a diesel driven pump, the emergency water replenishment pump (21) has a power source independent of the factory floor grid, the control valve (23) is an electric valve or a pneumatic valve, and the electric valve or the pneumatic valve is equipped with a manual operating mechanism.
8. An emergency water replenishment system for a waste heat boiler according to claim 1, characterized in that the main water replenishment pipe (12) and the emergency water replenishment pipe (22) have the same pipe diameter and the main water replenishment pump (11) and the emergency water replenishment pump (21) have the same rated flow.
9. Emergency water replenishing system for waste heat boilers according to claim 1, characterized in that the control unit (30) is connected with an operation panel (50), which operation panel (50) is provided with a manual and automatic mode switch (51) and a manual control button (52) for forcibly starting or stopping the emergency water replenishing unit (20).
10. An emergency water replenishing system for a waste heat boiler according to claim 9, further comprising an alarm unit (60), said alarm unit (60) being connected to said control unit (30) for emitting an audible and visual alarm signal when the water replenishing tank (1) level drops to said emergency water replenishing trigger level, said emergency water replenishing unit (20) is started or said emergency water replenishing unit (20) itself is malfunctioning.

Description

Emergency water supplementing system for waste heat boiler Technical Field The invention relates to the technical field of industrial waste heat recovery, in particular to an emergency water supplementing system for a waste heat boiler. Background In the field of industrial waste heat recovery, waste heat boiler systems are critical waste heat utilization devices, the safe and stable operation of which is highly dependent on reliable and continuous boiler feed water. At present, a common waste heat boiler system generally adopts a design of a single water supplementing path, and the scheme generally comprises a water supplementing tank (deaerator) for storing and supplying demineralized water, a softened water tank and a main water supplementing pipeline which is connected with the two water supplementing tanks and driven by the main water supplementing pump, wherein the system monitors the liquid level through a water level sensor arranged on the water supplementing tank and transmits signals to a control system, and when the water level is lower than a preset main water supplementing starting threshold value, the control system starts the main water supplementing pump, and water is supplemented to the water supplementing tank from the softened water tank through the main water supplementing pipeline. However, the reliability of the prior art is completely dependent on the normal operation of the single water supplementing path, when the main water supplementing pump has mechanical failure, the main water supplementing pipeline is blocked or leaked or the control power supply is interrupted, the whole water supplementing path is invalid, at the moment, the water level in the water supplementing tank continuously drops and cannot be supplemented, the waste heat boiler is easy to enter a water-deficient operation state, the boiler water deficiency is a serious operation accident, the furnace tube is overheated, deformed and even burst, the safety of equipment and personnel is endangered, unplanned shutdown is caused, and economic loss is caused. Disclosure of Invention According to the emergency water supplementing system for the waste heat boiler, a set of emergency water supplementing units which are complete and independent in structure are arranged in parallel outside the main water supplementing unit and work cooperatively with the control unit, redundant water supplementing paths are constructed, when the main water supplementing paths fail due to faults, the water supplementing tank drops to an emergency water supplementing trigger water level lower than a main water supplementing starting threshold value, the control unit can automatically identify the emergency state and start the emergency water supplementing unit to conduct quick water supplementing, the problem that the whole water supplementing system is paralyzed due to a single fault point in the prior art is solved, the overall reliability of the water supplementing system of the waste heat boiler is improved, the boiler water shortage operation risk caused by water supplementing interruption is avoided, and the system safety is guaranteed. In order to achieve the purpose, the invention is realized by the following technical scheme that the emergency water supplementing system for the waste heat boiler comprises: a water supplementing tank for storing and supplying water to the waste heat boiler; a softened water tank for storing softened water; The main water supplementing unit comprises a main water supplementing pump and a main water supplementing pipeline, and the main water supplementing pipeline is connected between the softened water tank and the water supplementing tank; the emergency water supplementing unit is arranged in parallel with the main water supplementing unit and comprises an emergency water supplementing pump and an emergency water supplementing pipeline, one end of the emergency water supplementing pipeline is connected to the softened water tank, and the other end of the emergency water supplementing pipeline is connected to the water supplementing tank; the control unit is connected with a water level sensor arranged on the water supplementing tank in a signal mode and used for monitoring the liquid level of the water supplementing tank, and is configured to automatically start the emergency water supplementing unit to supplement water to the water supplementing tank when the liquid level of the water supplementing tank is lower than an emergency water supplementing trigger water level of a main water supplementing start threshold. Preferably, the emergency water replenishing unit further comprises a control valve arranged on the emergency water replenishing pipeline, and when the control unit starts the emergency water replenishing unit, the control valve is synchronously controlled to be started and the emergency water replenishing pump is synchronously controlled to be started. Preferably, the control unit is a prog