Safety control device for high-back-pressure heat supply condenser

Abstract

The safety control device comprises a circulating pipe, a hot water return pipe is further arranged on the circulating pipe, and a cooling water inlet pipe, a cooling water drainage pipe and a hot water supply pipe are sequentially connected to the circulating pipe in parallel in the flowing direction of hot water in the circulating pipe; the cooling water inlet pipe and the cooling water outlet pipe are respectively connected with the cooling tower; the hot water supply pipe is communicated with a hot water user; regulating valves are arranged on the hot water return pipe, the cooling water inlet pipe, the cooling water discharge pipe and the hot water supply pipe; rapid pressure relief of the condenser under the high-back-pressure working condition can be guaranteed through simple pipeline transformation, and safe and stable operation of the system is guaranteed; and meanwhile, a pipe network of existing equipment is adaptively improved, the existing equipment is slightly modified, the equipment cost is reduced, the application range of the equipment is expanded, the system is particularly suitable for modifying the existing equipment, and the operation safety and reliability of the existing equipment are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of safety control equipment, in particular to a safety control device for a high-back pressure heat supply condenser. BACKGROUND

[0002] The condenser is a heat exchange equipment that condenses the steam discharged by the steam turbine into water, which plays a crucial role in the steam turbine device of the power plant. The condenser condenses the steam into water through the heat exchange between the cooling water and the steam, which not only helps to improve the thermal efficiency of the steam turbine, but also ensures the continuous operation of the entire thermal cycle.

[0003] In the prior art, the winter heat supply outlet is often connected with the condenser to realize the reuse of heat, but as the delivery distance is prolonged, the design pressure of the pipe of the hot water circulation outlet will be increased, thereby causing the pressure in the condenser to be continuously increased when the pipe fault occurs, and further affecting the safe operation of the equipment. CONTENT OF THE UTILITY MODEL

[0004] The main purpose of the present application is to provide a safety control device for a high-back pressure heat supply condenser, which aims to solve the low operation safety of the condenser in the prior art.

[0005] The present application achieves the above-mentioned purpose through the following technical solutions:

[0006] A safety control device for a high-back pressure heat supply condenser, comprising:

[0007] A circulating pipe arranged in the condenser;

[0008] A hot water return pipe, which is connected with the circulating pipe, has its inlet end connected with a hot water user, and has a cooling water inlet pipe, a cooling water outlet pipe and a hot water supply pipe connected in sequence and in parallel along the flow direction of the hot water in the circulating pipe; the cooling water inlet pipe and the cooling water outlet pipe are respectively connected with a cooling tower, and the hot water supply pipe is connected with the hot water user through a hot water pump; the hot water return pipe, the cooling water inlet pipe, the cooling water outlet pipe and the hot water supply pipe are all provided with adjusting valves for adjusting the on-off state thereof;

[0009] A pressure detection module, which is connected with the circulating pipe to detect the pressure in the circulating pipe;

[0010] A controller, which is electrically connected with the pressure detection module and each adjusting valve.

[0011] Optionally, along the flow direction of the hot water, a hot network heater and a hot water pump are arranged in sequence on the hot water supply pipe.

[0012] Optionally, the pressure detection module comprises at least three pressure sensors, and a plurality of pressure detection points communicating with the circulating pipe are arranged on the cooling water inlet pipe, and each pressure sensor is connected with each pressure detection point.

[0013] Optionally, a pressure relief valve is further arranged on the cooling water inlet pipe, and a bypass pipe is arranged on the cooling water outlet pipe and communicates with the pressure relief valve.

[0014] Optionally, the controller comprises an industrial computer and a PLC, the industrial computer is electrically connected with the PLC, and the PLC is electrically connected with each pressure sensor and the regulating valve.

[0015] Optionally, each branch pipe of the cooling water inlet pipe, the cooling water outlet pipe and the hot water supply pipe comprises a plurality of branch pipes, each branch pipe communicates with the circulating pipe, and each branch pipe is provided with a regulating valve.

[0016] Optionally, along the water flow direction, each branch pipe of the cooling water inlet pipe is sequentially provided with a regulating valve and a pressure relief valve.

[0017] Optionally, along the water flow direction, each branch pipe of the cooling water outlet pipe is sequentially provided with a regulating valve and a bypass pipe, and each bypass pipe communicates with each pressure relief valve.

[0018] Compared with the prior art, the application has the following beneficial effects:

[0019] The application comprises a circulating pipe installed in the condenser, the circulating pipe is further provided with a hot water return pipe, along the water flow direction in the circulating pipe, the circulating pipe is further sequentially and parallelly provided with a cooling water inlet pipe, a cooling water outlet pipe and a hot water supply pipe; the cooling water inlet pipe and the cooling water outlet pipe are connected with a cooling tower, and the hot water supply pipe communicates with a hot water user through a hot water pump; the hot water return pipe, the cooling water inlet pipe, the cooling water outlet pipe and the hot water supply pipe are all provided with regulating valves for adjusting the on-off state thereof.

[0020] In use, if the regulating valve on the hot water inlet pipe fails to cause abnormal pressure rise of the system, the pressure detection module can detect the abnormal change of the pressure in the first time, when the measured pressure value exceeds the set threshold value, it is determined that the working condition is abnormal, at this time, the cooling water outlet pipe is conducted by opening the regulating valve on the cooling water outlet pipe, so that the high-pressure water in the hot water return pipe and the circulating pipe is discharged to the cooling tower through the cooling water outlet pipe, thereby avoiding the abnormal pressure rise in the condenser and ensuring the normal operation of the condenser and the whole system.

[0021] Compared with the prior art, the application can ensure the rapid pressure relief of the condenser under high back pressure working condition through simple pipeline modification, and ensure the safe and stable operation of the system.

[0022] Secondly, the pipe network of the existing equipment is adaptively improved, the existing equipment is slightly changed, the equipment cost is reduced, the application range of the equipment is expanded, and the existing equipment is especially suitable for transformation, and the safety and reliability of the existing equipment operation are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structural schematic diagram of a safety control device for a high-back-pressure heat supply condenser is provided in the application;

[0024] The drawings show that: 1 is a circulating pipe, 2 is a condenser, 3 is a hot water return pipe, 4 is a cooling water inlet pipe, 5 is a cooling water outlet pipe, 6 is a hot water supply pipe, 7 is a regulating valve, 8 is a controller, 9 is a heat network heater, 10 is a hot water pump, a pressure sensor, 11 is a pressure relief valve, and 12 is a bypass pipe.

[0025] The purpose, functional characteristics and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0028] In the utility model, unless otherwise specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specified. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0029] In addition, if the description of "first", "second" and the like is involved in the embodiments of the utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. For example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously meet the scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the utility model.

[0030] Embodiment 1

[0031] Referring to Figure 1 , the embodiment discloses a safety control device for high back pressure heat supply condenser, comprising circulating pipe 1, circulating pipe 1 is installed in condenser 2 inside;

[0032] The safety control device further comprises hot water return pipe 3, cooling water inlet pipe 4, cooling water outlet pipe 5 and hot water supply pipe 6, along the circulating direction of water flow in circulating pipe 1, hot water return pipe 3, cooling water inlet pipe 4, cooling water outlet pipe 5 and hot water supply pipe 6 are sequentially arranged and are connected with circulating pipe 1 in parallel respectively;

[0033] Namely, the inlet end of hot water supply pipe 6 is communicated with circulating pipe 1, and the outlet end thereof is connected with each hot water user respectively, and the inlet end of hot water return pipe 3 is connected with each hot water user respectively, and the outlet end thereof is communicated with circulating pipe 1;

[0034] The inlet end of cooling water inlet pipe 4 is connected with cooling tower, and the outlet end thereof is connected with circulating pipe 1, and the inlet end of cooling water outlet pipe 5 is connected with circulating pipe 1, and the outlet end thereof is connected with cooling tower;

[0035] Meanwhile, adjusting valve 7 is arranged at one end of hot water return pipe 3, cooling water inlet pipe 4, cooling water outlet pipe 5 and hot water supply pipe 6 connected with circulating pipe 1, namely, adjusting valve 7 is arranged at the outlet end of hot water return pipe 3 and cooling water outlet pipe 5, and adjusting valve 7 is arranged at the inlet end of cooling water inlet pipe 4 and hot water supply pipe 6, and adjusting valve 7 is preferably electromagnetic butterfly valve;

[0036] Further, along the flow direction of the hot water, the hot water supply pipe 6 is sequentially provided with a heat network heater 9 and a hot water pump 10, and the regulating valve 7 on the hot water supply pipe 6 is arranged at the rear end of the heat network heater 9;

[0037] The hot water pump 10 and the heat network heater 9 can ensure stable flow and temperature of the hot water, and improve the heating quality;

[0038] Further, the safety control device further comprises a controller 8 and a pressure detection module, the controller 8 comprises an industrial computer and a PLC, and the industrial computer is electrically connected with the PLC; the pressure detection module comprises at least three pressure sensors, and a plurality of pressure detection points are arranged on the cooling water inlet pipe 4; it should be noted that each pressure detection point needs to be directly communicated with the circulating pipe 1, i.e. along the flow direction of the water, each pressure detection point is located at the front end of the regulating valve 7 on the cooling water inlet pipe 4; each pressure sensor is installed on each pressure detection point; and each pressure sensor is electrically connected with the PLC.

[0039] Meanwhile, a pressure relief valve is arranged on the cooling water inlet pipe 4, a bypass pipe is arranged on the cooling water outlet pipe, along the flow direction of the cooling water, on the cooling water inlet pipe 4, the pressure relief valve is arranged at the front end of the regulating valve 7, and on the cooling water outlet pipe 5, the bypass pipe is located at the front end of the regulating valve 7, and the outlet end of the bypass pipe is connected with the water inlet of the pressure relief valve;

[0040] Correspondingly, the application also discloses a control method based on the safety control device, which comprises the following steps:

[0041] S1, setting a first threshold value and a second threshold value of system control;

[0042] In actual working conditions, the design pressure of the heat network circulating water is 2.5 MPa, the design pressure of the condenser pipe side is 1.6 MPa, and the accidental closing of any valve in the heat network circulating water (such as the regulating valve on the hot water supply pipe) will cause the pressure of the circulating water between the pump outlet and the closing point to rise, and the highest pressure can reach 2.5 MPa;

[0043] Therefore, the first threshold value is set to 2.5 MPa; and the second threshold value is increased by 20% based on the first threshold value;

[0044] S2, measuring the water pressure of the system;

[0045] The water pressure in the circulating pipe is continuously detected by the pressure sensors, if the measured values of at least two of the three pressure sensors are higher than the first threshold value, it can be determined that the circulating pipe pressure is too large, at this time the regulating valve on the cooling water drain pipe is started, thereby the cooling water drain pipe is turned on, the high pressure hot water in the circulating pipe is discharged into the cooling tower through the cooling water drain pipe, thereby realizing the first level protection of the condenser;

[0046] If the pipe pressure continues to rise and exceeds the second threshold value in the case of the first level protection being started, the pressure relief valve is started, at this time the high pressure hot water will be directly discharged through the bypass pipe and the pressure relief valve, thereby rapidly reducing the pressure in the circulating pipe, realizing the second level protection of the equipment;

[0047] Further, the hot water return pipe 3, the cooling water inlet pipe 4, the cooling water drain pipe 5 and the hot water supply pipe 6 all include a plurality of branch pipes, each branch pipe is in communication with the circulating pipe 1, each branch pipe is provided with a regulating valve 7, and along the water flow direction, each branch pipe of the cooling water inlet pipe 4 is sequentially provided with a regulating valve 7 and a pressure relief valve, each branch pipe of the cooling water drain pipe 5 is sequentially provided with a regulating valve 7 and a bypass pipe, and each bypass pipe is in communication with each pressure relief valve.

[0048] Through the design of multiple branch pipes, not only the conveying capacity of the pipe network can be effectively expanded, but also the redundancy of the system can be improved, thereby ensuring the safe and stable operation of the equipment.

[0049] Compared with the prior art, the present application can ensure the rapid pressure relief of the condenser under high back pressure working condition through simple pipe reconstruction, thereby ensuring the safe and stable operation of the system.

[0050] Secondly, the present application can be improved by adapting the pipe network of the existing equipment, which has less change to the existing equipment, thereby reducing the cost of the equipment, expanding the application range of the equipment, especially suitable for the reconstruction of the existing equipment, and being beneficial to improve the safety and reliability of the operation of the existing equipment.

[0051] The above is only the preferred embodiment of the present application, and does not limit the patent range of the present application, any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.

Claims

1. A safety control device for a high back-pressure heating condenser, characterized in that, include: A circulation pipe (1) is installed inside the condenser (2); A hot water return pipe (3) is connected to the circulation pipe (1), and its inlet end is connected to the hot water user. Along the flow direction of hot water in the circulation pipe (1), a cooling water inlet pipe (4), a cooling water drain pipe (5), and a hot water supply pipe (6) are connected in parallel in the circulation pipe (1). The cooling water inlet pipe (4) and the cooling water drain pipe (5) are respectively connected to the cooling tower. The hot water supply pipe (6) is connected to the hot water user through a hot water pump (10). The hot water return pipe (3), the cooling water inlet pipe (4), the cooling water drain pipe (5), and the hot water supply pipe (6) are all equipped with regulating valves (7) for adjusting their on / off state. A pressure detection module is connected to the circulation pipe (1) to detect the pressure inside the circulation pipe (1); The controller (8) is electrically connected to the pressure detection module and each of the regulating valves (7).

2. A safety control device for a high back-pressure heating condenser according to claim 1, characterized in that, Along the direction of hot water flow, a heat network heater (9) and a hot water pump (10) are sequentially installed on the hot water supply pipe (6).

3. A safety control device for a high back-pressure heating condenser according to claim 1, characterized in that, The pressure detection module includes at least three pressure sensors. Several pressure detection points connected to the circulation pipe (1) are provided on the cooling water inlet pipe (4). Each pressure sensor is connected to each pressure detection point.

4. A safety control device for a high back-pressure heating condenser according to claim 1, characterized in that, The cooling water inlet pipe (4) is also equipped with a pressure relief valve (11), and the cooling water outlet pipe (5) is equipped with a bypass pipe (12), which is connected to the pressure relief valve.

5. A safety control device for a high back-pressure heating condenser (2) according to claim 1, characterized in that, The controller (8) includes an industrial control computer and a PLC. The industrial control computer is electrically connected to the PLC, and the PLC is electrically connected to each pressure sensor and regulating valve (7).

6. A safety control device for a high back-pressure heating condenser (2) according to claim 1, characterized in that, The hot water return pipe (3), cooling water inlet pipe (4), cooling water drain pipe (5) and hot water supply pipe (6) each include several branch pipes, each branch pipe is connected to the circulation pipe (1), and each branch pipe is equipped with a regulating valve (7).

7. A safety control device for a high back-pressure heating condenser (2) according to claim 6, characterized in that, Along the direction of water flow, each branch of the cooling water inlet pipe (4) is equipped with a regulating valve (7) and a pressure relief valve (11).

8. A safety control device for a high back-pressure heating condenser (2) according to claim 7, characterized in that, Along the direction of water flow, each branch of the cooling water drain pipe (5) is provided with a regulating valve (7) and a bypass pipe (12), and each bypass pipe (12) is connected to each pressure relief valve (11).

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