Deaerator dead steam recovery system

Abstract

The utility model relates to a deaerator dead steam recovery system which comprises a demineralized water hot main pipe, a demineralized water cold main pipe, a deaerator, a dead steam energy collector, a steam seal heater and a drain tank. A water inlet and a water outlet of the steam seal heater are respectively connected with a desalted water cooling mother pipe and a water inlet of the drain tank, a water outlet of the drain tank is connected with a water inlet of the dead steam energy collector, and an air inlet and a water outlet of the dead steam energy collector are respectively connected with an exhaust port of the deaerator and a desalted water heating mother pipe. The dead steam recovery system of the deaerator can improve the heat exchange efficiency in the dead steam energy collector, reduce energy loss, improve the temperature of demineralized water entering the deaerator and reduce the energy consumption of the deaerator, and has better economic and environment-friendly benefits.

Description

Technical Field

[0001] This utility model relates to the field of water treatment technology, and in particular to a deaerator exhaust steam recovery system. Background Technology

[0002] Deaerators are devices used in industries such as thermal power, chemical engineering, and light industry to deoxygenate boiler feedwater. Their working principle involves heating the deoxygenated water entering the deaerator with high-temperature steam, gradually increasing the partial pressure of steam above the water surface while gradually decreasing the partial pressure of dissolved gases. This causes oxygen to precipitate out of the deoxygenated water and be discharged with the steam, thus achieving deoxygenation. However, since the discharged exhaust steam still contains a large amount of heat energy, directly releasing it into the atmosphere results in heat loss and energy waste. Existing systems for recovering exhaust steam from deaerators connect an exhaust steam energy recovery unit directly between the demineralized water supply pipe and the deaerator. The exhaust steam from the deaerator enters the exhaust steam energy recovery unit and exchanges heat with the demineralized water entering the unit, raising the temperature of the demineralized water before it is sent to the deaerator. This recovers and utilizes the water vapor and heat energy within the exhaust steam. However, the significant temperature difference between the exhaust steam and the demineralized water in the exhaust steam energy recovery unit leads to low heat transfer efficiency and significant energy loss. Furthermore, the temperature of the demineralized water entering the deaerator is relatively low. This results in high energy consumption for the deaerator.

[0003] To address the aforementioned problems, this utility model provides improvements. Utility Model Content

[0004] This invention proposes a deaerator exhaust steam recovery system, which solves the above-mentioned problems existing in the use of the prior art.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A deaerator exhaust steam recovery system includes a demineralized water hot header, a demineralized water cold header, a deaerator, an exhaust steam energy recovery device, a steam seal heater, and a condensate tank. The inlet of the deaerator is connected to the demineralized water hot header. The inlet and outlet of the steam seal heater are respectively connected to the inlet of the demineralized water cold header and the condensate tank. The outlet of the condensate tank is connected to the inlet of the exhaust steam energy recovery device. The air inlet and outlet of the exhaust steam energy recovery device are respectively connected to the exhaust outlet of the deaerator and the demineralized water hot header.

[0007] Preferably, the outlet of the steam seal heater is connected to the inlet of the condensate tank via a mixing heater, and the inlet and outlet of the mixing heater are respectively connected to the outlet of the steam seal heater and the inlet of the condensate tank.

[0008] Preferably, two sets of the steam seal heaters are connected in parallel between the inlet of the demineralized water cooling header and the inlet of the mixing water heater.

[0009] Preferably, an electric regulating valve is connected to the inlet of the mixing heater.

[0010] Preferably, a first gate valve and a second gate valve are connected to the inlet and outlet of the steam seal heater, respectively, and a first inspection pipe is connected between the inlet and outlet of the steam seal heater, with a third gate valve connected to the first inspection pipe.

[0011] Preferably, a fourth gate valve and a fifth gate valve are connected to the inlet and outlet of the electric regulating valve, respectively. A second inspection pipe is connected between the inlet of the fourth gate valve and the outlet of the fifth gate valve, and a sixth gate valve is connected to the second inspection pipe.

[0012] Preferably, a third inspection pipe is connected between the outlet of the steam seal heater and the demineralized water heat header, and a seventh gate valve is connected to the third inspection pipe. An eighth gate valve, a ninth gate valve, and a tenth gate valve are respectively connected to the inlet, outlet, and air inlet of the waste steam energy harvester.

[0013] In summary, the beneficial effects of this utility model are as follows: the temperature of the demineralized water entering the waste steam energy harvester is increased by the action of the steam seal heater, reducing the temperature difference between the demineralized water and the waste gas, thereby improving the efficiency of heat exchange and reducing energy loss. Furthermore, the demineralized water after passing through the waste gas energy harvester has a higher temperature, thereby reducing the energy consumption when the demineralized water enters the deaerator for deoxygenation, resulting in better economic and environmental benefits. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] In the diagram: 1. Demineralized water hot header; 2. Demineralized water cold header; 3. Deaerator; 4. Waste steam energy recovery unit; 41. Eighth gate valve; 42. Ninth gate valve; 43. Tenth gate valve; 5. Steam seal heater; 51. First gate valve; 52. Second gate valve; 53. First maintenance pipe; 54. Third gate valve; 6. Drain tank; 61. Drain pump; 7. Mixing water heater; 71. Electric regulating valve; 72. Fourth gate valve; 73. Fifth gate valve; 74. Second maintenance pipe; 75. Sixth gate valve; 8. Third maintenance pipe; 81. Seventh gate valve. Detailed Implementation

[0017] The following will refer to the appendix in the embodiments of this utility model. Figure 1 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] As shown in the figure, a deaerator 3 waste steam recovery system includes a demineralized water hot header 1, a demineralized water cold header 2, a deaerator 3, a waste steam energy recovery device 4, a steam seal heater 5, and a condensate tank 6. The inlet of the deaerator 3 is connected to the demineralized water hot header 1. The inlet and outlet of the steam seal heater 5 are connected to the demineralized water cold header 2 and the inlet of the condensate tank 6, respectively. The outlet of the condensate tank 6 is connected to the inlet of the waste steam energy recovery device 4. The air inlet and water outlet of the waste steam energy recovery device 4 are connected to the exhaust port of the deaerator 3 and the demineralized water hot header 1, respectively.

[0019] In the above structure, the inlet of the demineralized water cooling header 2 is connected to the water supply of the water treatment plant. The demineralized water entering the demineralized water cooling header 2 enters the steam seal heater 5 through the inlet of the steam seal heater 5 and is heated by the steam seal heater 5. After being heated, the demineralized water enters the condensate tank 6 through the outlet of the steam seal heater 5 and the inlet of the condensate tank 6. The condensate pump connected to the outlet of the condensate tank 6 pumps the condensate into the condensate energy collector 4 through the inlet of the condensate energy collector 4. At the same time, the exhaust steam generated by the deaerator 3 enters the condensate energy collector 4 through the exhaust port of the deaerator 3 and the air inlet of the condensate energy collector 4. The exhaust steam and demineralized water in the condensate energy collector 4 are then reacted. Heat exchange further raises the temperature of the demineralized water. The further heated demineralized water enters the demineralized water heat header 1 through the outlet of the waste steam energy recovery unit 4, and then enters the deaerator 3 through the demineralized water heat header 1, realizing the recovery and utilization of the waste steam of the deaerator 3. In the above-mentioned waste steam recovery process, the temperature of the demineralized water entering the waste steam energy recovery unit 4 is raised by the action of the steam seal heater 5, reducing the temperature difference between the demineralized water and the waste gas, thereby improving the efficiency of heat exchange and reducing energy loss. Furthermore, the demineralized water after passing through the waste gas energy recovery unit has a higher temperature, thereby reducing the energy consumption when the demineralized water enters the deaerator 3 for deoxygenation, resulting in better economic and environmental benefits.

[0020] In addition, in order to improve the heating rate of the demineralized water by the steam seal heater 5, two sets of the steam seal heater 5 are connected in parallel between the demineralized water cold header 2 and the inlet of the mixing water heater 7.

[0021] Additionally, the outlet of the steam seal heater 5 is connected to the inlet of the condensate tank 6 via the mixing heater 7. The inlet and outlet of the mixing heater 7 are connected to the outlet of the steam seal heater 5 and the inlet of the condensate tank 6, respectively. The demineralized water heated by the steam seal heater 5 enters the mixing heater 7 through the inlet of the mixing heater 7 and is further heated by the mixing heater 7, thereby further increasing the temperature of the demineralized water entering the waste steam energy recovery unit 4, further reducing the temperature difference between the waste steam and the demineralized water in the waste steam energy recovery unit 4, thereby further improving the heat exchange efficiency in the waste steam energy recovery unit 4, reducing energy loss, and also further increasing the temperature of the demineralized water entering the deaerator 3, reducing the energy consumption of the deaerator 3.

[0022] In addition, an electric regulating valve 71 is connected to the inlet of the mixing heater 7. The flow rate of demineralized water entering the mixing heater 7 is adjusted by the electric regulating valve 71, so as to accurately control the mixing ratio in the mixing heater 7 and reduce energy consumption.

[0023] Additionally, a first gate valve 51 and a second gate valve 52 are connected to the inlet and outlet of the steam seal heater 5, respectively. A first maintenance pipe 53 is connected between the inlet and outlet of the steam seal heater 5, and a third gate valve 54 is connected to the first maintenance pipe 53. Under normal conditions, the first gate valve 51 and the second gate valve 52 are in the open state, and the third gate valve 54 is in the closed state. When it is necessary to maintain the steam seal heater 5, the first gate valve 51 and the second gate valve 52 are closed, and the third gate valve 54 is opened, so that the demineralized water in the demineralized water cooling header 2 enters the mixing water heater 7 through the first maintenance pipe 53, and the maintenance of the steam seal heater 5 is achieved without affecting the operation of the deaerator 3.

[0024] Additionally, a fourth gate valve 72 and a fifth gate valve 73 are connected to the inlet and outlet of the electric regulating valve 71, respectively. A second inspection pipe 74 is connected between the inlet of the fourth gate valve 72 and the outlet of the fifth gate valve 73. A sixth gate valve 75 is connected to the second inspection pipe 74. Under normal conditions, the fourth gate valve 72 and the fifth gate valve 73 are in the open state, and the sixth gate valve 75 is in the closed state. When it is necessary to maintain the electric regulating valve 71, the fourth gate valve 72 and the fifth gate valve 73 are closed, and the sixth gate valve 75 is opened, so that the demineralized water enters the mixing heater 7 through the second inspection pipe 74. The electric regulating valve 71 can be maintained without affecting the operation of the deaerator 3.

[0025] Additionally, a third maintenance pipe 8 is connected between the outlet of the steam seal heater 5 and the demineralized water heat header 1. A seventh gate valve 81 is connected to the third maintenance pipe 8. An eighth gate valve 41, a ninth gate valve 42, and a tenth gate valve 43 are connected to the inlet, outlet, and air inlet of the waste steam energy harvester 4, respectively. Under normal conditions, the eighth gate valve 41, the ninth gate valve 42, and the tenth gate valve 43 are in the open state, and the eighth gate valve 41 is in the closed state. When it is necessary to repair the mixing water heater 7, the condensate tank 6, or the waste steam energy harvester, the fourth gate valve 72, the eighth gate valve 41, the ninth gate valve 42, and the tenth gate valve 43 are closed, and the seventh gate valve 81 is opened. The demineralized water after passing through the steam seal heater 5 enters the demineralized water header through the third maintenance pipe 8 and then enters the deaerator 3. Repairs can be carried out on the mixing water heater 7, the condensate tank 6, or the waste steam energy harvester without affecting the operation of the deaerator 3.

[0026] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A deaerator exhaust steam recovery system, characterized in that: It includes a demineralized water hot header (1), a demineralized water cold header (2), a deaerator (3), a waste steam energy harvester (4), a steam seal heater (5), and a condensate tank (6). The inlet of the deaerator (3) is connected to the demineralized water hot header (1). The inlet and outlet of the steam seal heater (5) are connected to the inlet of the demineralized water cold header (2) and the condensate tank (6), respectively. The outlet of the condensate tank (6) is connected to the inlet of the waste steam energy harvester (4). The air inlet and outlet of the waste steam energy harvester (4) are connected to the exhaust port of the deaerator (3) and the demineralized water hot header (1), respectively.

2. The deaerator exhaust steam recovery system according to claim 1, characterized in that: The outlet of the steam seal heater (5) is connected to the inlet of the drain tank (6) through the mixing heater (7). The inlet and outlet of the mixing heater (7) are respectively connected to the outlet of the steam seal heater (5) and the inlet of the drain tank (6).

3. The deaerator exhaust steam recovery system according to claim 2, characterized in that: The steam seal heater (5) is provided in two sets in parallel between the inlet of the demineralized water cooling header (2) and the water mixing heater (7).

4. The deaerator exhaust steam recovery system according to claim 3, characterized in that: An electric regulating valve (71) is connected to the inlet of the mixing heater (7).

5. The deaerator exhaust steam recovery system according to claim 4, characterized in that: The inlet and outlet of the steam seal heater (5) are respectively connected to a first gate valve (51) and a second gate valve (52), and a first inspection pipe (53) is connected between the inlet and outlet of the steam seal heater (5). A third gate valve (54) is connected to the first inspection pipe (53).

6. The deaerator exhaust steam recovery system according to claim 5, characterized in that: The electric regulating valve (71) is connected to a fourth gate valve (72) and a fifth gate valve (73) at its inlet and outlet, respectively. A second inspection pipe (74) is connected between the inlet of the fourth gate valve (72) and the outlet of the fifth gate valve (73). A sixth gate valve (75) is connected to the second inspection pipe (74).

7. The deaerator exhaust steam recovery system according to claim 6, characterized in that: The outlet of the steam seal heater (5) is connected to the demineralized water heat header (1) via a third maintenance pipe (8), and a seventh gate valve (81) is connected to the third maintenance pipe (8). The inlet, outlet and air inlet of the waste steam energy harvester (4) are respectively connected to an eighth gate valve (41), a ninth gate valve (42) and a tenth gate valve (43).

Images