Unit steam seal drain water recovery system

Abstract

The utility model relates to the technical field of unit steam seal drain water recovery, in particular to a unit steam seal drain water recovery system which comprises a steam turbine, a drain water expansion box connected with a drain water outlet of the steam turbine and a recovery system connected with the steam turbine and the drain water expansion box. The recovery system comprises a drainage collecting box arranged in a condenser water pipe pit, a drainage box connected with the drainage collecting box and a deaerator connected with the drainage box. The steam turbine unit steam seal drainage pipeline and the drainage expansion box incoming water loop are both connected with conveying pipelines connected with the drainage collection box. The steam turbine, the drainage expansion box and the recovery system are connected through a conveying pipeline and the like to form an integrated system, the drainage treatment process is simplified, and intermediate links and complex operation are reduced; and drain water in the steam turbine is discharged in time and treated through a connecting pipeline, accumulation of the drain water in the steam turbine is avoided, corrosion and damage to internal parts of the steam turbine are reduced, and therefore the reliability of the steam turbine is improved, and the service life of the steam turbine is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of steam seal drain recovery of units, and specifically relates to a steam seal drain recovery system for units. Background Technique

[0002] In modern industrial production, the operating efficiency and energy utilization efficiency of steam turbines are crucial. During the operation of steam turbines, a large amount of steam seal drain and drain from the drain expansion tank are generated. Traditional treatment methods have many deficiencies. For example, on the one hand, these drains cannot be effectively recovered and utilized, resulting in waste of energy and loss of resources. On the other hand, due to the lack of a reasonable collection and treatment system, the discharge of drains will have a certain impact on the environment, which does not conform to the current development concept of green environmental protection.

[0003] In the existing technology, the function of the condenser water pipe pit is usually relatively single, and its potential value cannot be fully utilized. At the same time, the treatment of the steam seal drain of the unit and the water coming from the drain expansion tank lacks systematicness and integration, increasing the operating cost and maintenance difficulty. With the continuous progress of industrial technology and the increasing requirements of energy management, a new solution is needed to optimize the treatment and utilization of drains. This patent realizes the effective recovery and reuse of the steam seal drain of the unit and the water coming from the drain expansion tank by installing a drain collection box in the condenser water pipe pit, which not only improves the energy utilization efficiency, reduces the production cost, but also reduces the impact on the environment. Content of the Utility Model

[0004] The purpose of the utility model is to provide a steam seal drain recovery system for units, which is used to solve the problems that the existing drains cannot be effectively recovered and utilized, resulting in waste of energy and loss of resources, and the discharge of drains has an impact on the environment due to the lack of a reasonable collection and treatment system.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A steam seal drain recovery system for units, including a steam turbine, a drain expansion tank connected to the drain outlet of the steam turbine, and a recovery system connected to the steam turbine and the drain expansion tank respectively. The recovery system includes a drain collection box arranged in the condenser water pipe pit, a drain tank connected to the drain collection box, and a deaerator connected to the drain tank; a conveying pipeline connected to the drain collection box is connected to both the steam seal drain pipeline of the steam turbine unit and the water return path of the water coming from the drain expansion tank.

[0006] Further, a submersible pump is arranged between the drain collection box and the drain tank.

[0007] Further, a drain pump is arranged between the drain tank and the deaerator.

[0008] Further, stop valves are arranged between the submersible pump and the drain tank and between the drain tank and the drain pump.

[0009] Further, a check valve is provided between the drain pump and the deaerator.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] 1. The recovery system is connected through the steam turbine drain outlet to the drain expansion tank, and the steam seal drain pipeline of the steam turbine unit and the water coming from the drain expansion tank are connected to the drain collection tank through the conveying pipeline, so that the originally wasted drain water can be collected and recycled. Moreover, the drain collection tank is sequentially connected to the drain tank and the deaerator, realizing the reuse process of the drain water, and making full use of the energy and water resources contained in the drain water;

[0012] 2. The sequential connection between the drain collection tank, the drain tank and the deaerator forms an orderly drain water treatment path, making the thermal cycle of the system more stable and improving the overall efficiency;

[0013] 3. The connection of the steam turbine, the drain expansion tank and the components of the recovery system realizes the recovery and reuse of the drain water, reducing the procurement and treatment costs of external fresh demineralized water;

[0014] 4. The above connection method avoids the direct discharge of the drain water into the environment, reduces the emissions of heat and pollutants, and alleviates the thermal pollution and chemical pollution to the environment;

[0015] 5. The drain collection tank is arranged in the condenser water pipe pit, making full use of this existing space and eliminating the need to additionally allocate a special site for installing the recovery equipment;

[0016] 6. The steam turbine, the drain expansion tank and the recovery system are connected through pipelines such as the conveying pipeline, forming an integrated system, simplifying the drain water treatment process, reducing intermediate links and complex operations; and can timely discharge the drain water inside the steam turbine and process it through the connecting pipeline, avoiding the accumulation of the drain water inside the steam turbine, reducing the corrosion and damage to the internal components of the steam turbine, thereby improving the reliability and service life of the steam turbine; similarly, the connection between the drain expansion tank and the recovery system also helps to maintain its normal working state and reduce the risk of failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is the overall structure diagram of the present utility model.

[0018] In the figure:

[0019] 1. Steam turbine; 2. Drain expansion tank; 3. Drain collection tank; 4. Drain tank; 5. Deaerator; 6. Conveying pipeline; 7. Submersible pump; 8. Drain pump; 9. Globe valve; 10. Check valve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Please refer to Figure 1 A steam seal drain recovery system for a unit, which consists of a steam turbine 1, a drain expansion tank 2 connected to the drain outlet of the steam turbine 1, and a recovery system respectively connected to the steam turbine 1 and the drain expansion tank 2. Among them, the recovery system consists of a drain collection tank 3 arranged in the condenser water pipe pit, a drain tank 4 connected to the drain collection tank 3, and a deaerator 5 connected to the drain tank 4; and a delivery pipeline 6 connected to the drain collection tank 3 is connected to both the steam seal drain pipeline of the steam turbine 1 unit and the water inlet pipeline of the drain expansion tank 2; a submersible pump 7 is provided between the drain collection tank 3 and the drain tank 4; a drain pump 8 is provided between the drain tank 4 and the deaerator 5; stop valves 9 are provided between the submersible pump 7 and the drain tank 4 and between the drain tank 4 and the drain pump 8; a check valve 10 is provided between the drain pump 8 and the deaerator 5; by setting the submersible pump 7 and the drain pump 8, the recovered drain water can be transported into the deaerator 5 for recycling, the provided stop valve 9 is used to control the on-off and flow regulation of the water flow, and the provided check valve 10 is used to prevent the water flow from flowing back to protect the equipment.

[0021] The working principle of the present utility model: A part of the drain water generated on the steam seal drain pipeline of the steam turbine 1 unit and the water inlet pipeline of the drain expansion tank 2 is collected into the drain collection tank 3, and is pumped into the deaerator 5 for recycling through the provided submersible pump 7 and drain pump 8;

[0022] The recovery system is connected to the drain expansion tank 2 through the drain outlet of the steam turbine 1, and the steam seal drain pipeline of the steam turbine 1 unit and the water inlet of the drain expansion tank 2 are connected to the drain collection tank 3 through the delivery pipeline 6, so that the originally wasted drain water can be collected and recycled. The drain collection tank 3 is sequentially connected to the drain tank 4 and the deaerator 5, realizing the recycling process of the drain water, making full use of the energy and water resources contained in the drain water to improve the recovery and utilization of energy;

[0023] The sequential connection between the drain collection tank 3, the drain tank 4 and the deaerator 5 forms an orderly drain water treatment path, making the thermal cycle of the system more stable and improving the overall efficiency;

[0024] The connection between the steam turbine 1, the drain expansion tank 2 and the components of the recovery system realizes the recovery and recycling of the drain water, reducing the procurement and treatment costs of external new demineralized water;

[0025] The above connection method avoids the direct discharge of the drain water into the environment, reduces the emissions of heat and pollutants, and reduces the thermal pollution and chemical pollution to the environment;

[0026] The drain collection tank 3 is arranged in the condenser water pipe pit, making full use of this existing space and not requiring additional dedicated sites to install the recovery equipment;

[0027] The steam turbine 1, the drain expansion tank 2 and the recovery system are connected through a conveying pipeline 6 etc., forming an integrated system, which simplifies the drain treatment process, reduces intermediate links and complex operations; and can timely discharge the drain inside the steam turbine 1 and process it through the connecting pipeline, avoiding the accumulation of drain inside the steam turbine 1, reducing the corrosion and damage to the internal components of the steam turbine 1, thereby improving the reliability and service life of the steam turbine 1; similarly, the connection between the drain expansion tank 2 and the recovery system also helps to maintain its normal working state and reduce the risk of failure.

Claims

1. A steam seal drain recovery system for a unit, comprising a steam turbine (1), a drain expansion tank (2) connected to a drain outlet of the steam turbine (1), and a recovery system connected to the steam turbine (1) and the drain expansion tank (2), respectively, characterized in that: The recovery system comprises a drain header box (3) arranged in the condenser water pipe pit, a drain box (4) connected to the drain header box (3), and a deaerator (5) connected to the drain box (4); the steam seal drain pipeline of the steam turbine (1) unit and the water supply circuit of the drain expansion tank (2) are both connected to a delivery pipeline (6) connected to the drain header box (3).

2. A unit steam seal drain recovery system as claimed in claim 1, characterized in that: A submersible pump (7) is provided between the drain collecting box (3) and the drain box (4).

3. A unit steam seal drain recovery system as claimed in claim 2, characterized in that: A drain pump (8) is provided between the drain tank (4) and the deaerator (5).

4. A unit steam seal drain recovery system as claimed in claim 3, characterized in that: Stop valves (9) are provided between the submersible pump (7) and the drain tank (4), and between the drain tank (4) and the drain pump (8).

5. A unit steam seal drain recovery system as claimed in claim 3, characterized in that: A check valve (10) is provided between the drain pump (8) and the deaerator (5).

Images