Steam recycling system of waste heat boiler power plant

Abstract

The utility model relates to a waste heat boiler power plant steam recycling system which comprises a steam gathering pipeline, a steam gathering box and an external supply pipeline which are sequentially connected, a steam gathering adjusting valve set is arranged on the steam gathering pipeline, and an external supply adjusting valve set is arranged on the external supply pipeline. A drain water recovery pipeline is led out of the steam gathering box, the external supply pipeline is connected with a dead steam recovery pipeline after being conveyed to a heat user, the steam gathering regulating valve group comprises at least two valves which are connected in parallel, and the external supply regulating valve group comprises at least two valves which are connected in parallel; and a pressure measuring station, a temperature measuring station and an atmosphere exhausting station are arranged between the steam gathering regulating valve group and the external supply regulating valve group. Waste heat in steam can be utilized to the maximum extent, dead steam and drained water generated in the process can be recycled into an original steam-water circulation system, and steam-water loss is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of waste heat recovery, in particular to a waste heat boiler power plant steam recovery and utilization system. Background Art

[0002] The boiler power generation system will generate a large amount of heat energy during operation, which is difficult to be fully utilized, so it will generate waste heat and cause energy waste.

[0003] In the prior art, when the waste heat boiler power generation system starts or stops the unit or adjusts the load, the excess steam is generally discharged directly or passes through a temperature and pressure reducer before entering a bypass condenser. When the steam is discharged directly, it will generate a lot of noise and affect the plant environment; adding a bypass condenser will not be able to utilize the waste heat of the steam and increase the cost and land area. Utility Model Content

[0004] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a waste heat boiler power plant steam recovery and utilization system with a reasonable structure, which recovers the steam whose thermal energy cannot be utilized in the original technology and realizes the purpose of using waste heat for civilian use.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A steam recovery and utilization system for a waste heat boiler power plant comprises a steam converging pipeline, a steam converging box, and an external supply pipeline connected in sequence.

[0007] The steam converging pipeline is provided with a steam converging regulating valve group, and the external supply pipeline is provided with an external supply regulating valve group; a drain recovery pipeline is led out from the steam converging box, and the external supply pipeline is connected with a spent steam recovery pipeline after being transported to the heat user.

[0008] The steam control valve group includes at least two valves connected in parallel, and the external supply control valve group includes at least two valves connected in parallel; pressure measuring, temperature measuring, and exhausting stations are provided between the steam control valve group and the external supply control valve group.

[0009] As a further improvement of the above technical solution:

[0010] The input end of the steam collection pipeline is connected to the main steam input pipeline and the vent steam input pipeline.

[0011] The main steam input pipeline and the vent steam input pipeline are connected in parallel at the input end of the steam collection pipeline, and are each equipped with a valve.

[0012] The branches where the main steam input pipeline and the vent steam input pipeline are located are both equipped with input electric shut-off valves and input manual shut-off valves. The input electric shut-off valve is located on the output direction side of the input manual shut-off valve.

[0013] The steam regulating valve group includes a first steam manual valve, a first steam electric valve, and a second steam manual valve which are connected in series on the steam pipeline and are arranged in sequence along the fluid flow direction; a parallel branch is led out on the steam pipeline, and the parallel branch is provided with: a third steam manual valve connected in parallel with the first steam manual valve, the first steam electric valve, and the second steam manual valve.

[0014] The external supply regulating valve group includes a first external supply manual valve, a first external electric pneumatic valve, and a second external supply manual valve which are connected in series on an external supply pipeline and are arranged in sequence along the fluid flow direction; a parallel branch is led out on the external supply pipeline, and the parallel branch is provided with: a third external supply manual valve connected in parallel with the first external supply manual valve, the first external electric pneumatic valve, and the second external supply manual valve.

[0015] The steam box is connected with pressure measuring elements and temperature measuring elements.

[0016] An exhaust pipe to the atmosphere is provided on the steam box.

[0017] A recovery manual shut-off valve is provided on the drain recovery pipeline.

[0018] The beneficial effects of the utility model are as follows:

[0019] Compared with the original waste heat boiler power generation system, the utility model discloses a waste heat boiler power generation system in which the excess steam is generally discharged directly or enters the bypass condenser after passing through a temperature and pressure reducer when the unit is started or stopped or the load is adjusted, which generates noise and affects the plant environment; although the bypass condenser is added, the moisture in the steam is collected for utilization again, the waste heat of the steam cannot be utilized, and the cost and space occupied are increased.

[0020] The purpose of the utility model is to provide a system that can both utilize waste heat and recycle water. Steam is input in two ways, including a main steam input pipeline and a vented steam input pipeline. The purpose of the separate inputs of these two pipelines is to facilitate the collection of steam in different states and then merge them into the same pipeline. The valve group on the steam confluence pipeline is used to regulate the amount of steam input into the steam confluence box, and in combination with the opening and closing of the external supply pipeline and the valve group thereon, effectively ensures that the pressure and temperature in the steam confluence box are within the expected range. The exhaust gas pipeline and the drain recovery pipeline on the steam confluence box are used to exhaust gas and water, and together with the steam confluence regulating valve group and the external supply regulating valve group, maintain the pressure and temperature environment in the steam confluence box. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the pipeline structure of the utility model.

[0022] Figure 2 This is a pipeline schematic diagram of the utility model, in which arrows indicate flow directions.

[0023] Among them: 1. Steam converging pipeline; 2. Steam converging box; 3. External supply pipeline; 4. Drain recovery pipeline; 5. Exhaust steam recovery pipeline; 6. Steam converging regulating valve group; 7. External supply regulating valve group; 8. Pressure measuring element; 9. Temperature measuring element; 10. Exhaust pipeline;

[0024] 101. Main steam input pipeline; 102. Diffuse steam input pipeline; 103. Input electric shut-off valve 104. Input manual shut-off valve;

[0025] 601, the first steam manual valve; 602, the first steam electric valve; 603, the second steam manual valve; 604, the third steam manual valve;

[0026] 701, first external supply manual valve; 702, first external supply pneumatic valve; 703, second external supply manual valve; 704, third external supply manual valve. DETAILED DESCRIPTION

[0027] The specific implementation of the present utility model is described below in conjunction with the accompanying drawings.

[0028] like Figure 1 As shown, the waste heat boiler power plant steam recovery and utilization system of this embodiment includes a steam converging pipeline 1, a steam converging box 2, and an external supply pipeline 3 connected in sequence.

[0029] A steam regulating valve group 6 is provided on the steam converging pipe 1, and an external supply regulating valve group 7 is provided on the external supply pipe 3; a drain recovery pipe 4 is led out from the steam converging box 2, and a spent steam recovery pipe 5 is connected to the external supply pipe 3 after being transported to the heat user.

[0030] The steam regulating valve group 6 includes at least two valves connected in parallel, and the external supply regulating valve group 7 includes at least two valves connected in parallel; pressure measuring, temperature measuring, and exhausting stations are provided between the steam regulating valve group 6 and the external supply regulating valve group 7.

[0031] The input end of the steam collecting pipeline 1 is connected to the main steam input pipeline 101 and the vent steam input pipeline 102 .

[0032] The main steam input pipeline 101 and the vent steam input pipeline 102 are connected in parallel to the input end of the steam collection pipeline 1, and are each equipped with a valve.

[0033] The branches where the main steam input pipeline 101 and the vent steam input pipeline 102 are located are both provided with an input electric shut-off valve 103 and an input manual shut-off valve 104 . The input electric shut-off valve 103 is located on the output direction side of the input manual shut-off valve 104 .

[0034] The steam regulating valve group 6 includes a first steam manual valve 601, a first steam electric valve 602, and a second steam manual valve 603 which are connected in series on the steam pipeline 1 and are arranged in sequence along the fluid flow direction; a parallel branch is led out on the steam pipeline 1, and the parallel branch is provided with: a third steam manual valve 604 which is connected in parallel with the first steam manual valve 601, the first steam electric valve 602, and the second steam manual valve 603.

[0035] The external supply regulating valve group 7 includes a first external supply manual valve 701, a first external electric pneumatic valve 702, and a second external supply manual valve 703 which are connected in series on the external supply pipeline 3 and arranged in sequence along the fluid flow direction; a parallel branch is led out on the external supply pipeline 3, and the parallel branch is provided with: a third external supply manual valve 704 which is connected in parallel with the first external supply manual valve 701, the first external electric pneumatic valve 702, and the second external supply manual valve 703.

[0036] A pressure measuring element 8 and a temperature measuring element 9 are connected to the steam header 2 .

[0037] An exhaust air pipeline 10 is arranged on the steam header 2 .

[0038] A manual shut-off valve is provided on the drain recovery pipeline 4.

[0039] The specific structure and working principle of the utility model are as follows:

[0040] like Figure 1 As shown, the utility model introduces steam from two pipelines, namely the main steam input pipeline 101 and the vented steam input pipeline 102. After the two steam pipelines merge into the steam converging pipeline 1, they enter the steam converging box 2 through the steam converging regulating valve group 6. After the steam in the steam converging box 2 is balanced in pressure and improved in storage volume, it enters the external supply pipeline 3, and the output volume is adjusted by the external supply regulating valve group 7 on the external supply pipeline 3 to transport the heat energy to the heat user. The residual steam after being used by the heat user is output from the exhaust steam recovery pipeline 5.

[0041] The key design point of this scheme is to add pipelines with adjustable steam pressure and flow, use valve group and steam manifold 2 to balance the pressure inside and outside the system, increase the steam storage capacity, and improve the stability of steam supply, and then stably supply the regulated steam to heat users.

[0042] On this basis, a steam regulating valve group 6 and an external supply regulating valve group 7 are respectively provided on the pipeline to further control the pressure and flow through parallel valves.

[0043] The utility model can maximize the use of waste heat in the steam by collecting this part of steam and supplying it to heat users. The exhaust steam and drain water generated in the process can also be recycled into the original steam-water circulation system, reducing steam-water loss.

[0044] In addition, the steam header 2 is provided with pressure and temperature measuring elements 9, which cooperate with the regulating valve group of the external supply pipeline 3 to stably provide the steam parameters required by the heat users.

[0045] The above description is an explanation of the utility model, not a limitation of the utility model. The scope of the utility model is defined by the claims. Any form of modification can be made within the protection scope of the utility model.

Claims

1. A waste heat boiler power plant steam recovery and utilization system, characterized in that: It comprises a steam converging pipeline (1), a steam converging box (2), and an external supply pipeline (3) which are connected in sequence. The steam converging pipeline (1) is provided with a steam converging regulating valve group (6), and the external supply pipeline (3) is provided with an external supply regulating valve group (7); a drain recovery pipeline (4) is led out from the steam converging box (2), and the external supply pipeline (3) is connected to a spent steam recovery pipeline (5) after being transported to the heat user. The steam control valve group (6) includes at least two valves connected in parallel, and the external supply control valve group (7) includes at least two valves connected in parallel; pressure measuring, temperature measuring, and exhausting stations are provided between the steam control valve group (6) and the external supply control valve group (7).

2. The waste heat boiler power plant steam recovery and utilization system according to claim 1, characterized in that: The input end of the steam collecting pipeline (1) is connected to the main steam input pipeline (101) and the venting steam input pipeline (102).

3. The waste heat boiler power plant steam recovery and utilization system according to claim 2, characterized in that: The main steam input pipeline (101) and the vent steam input pipeline (102) are connected in parallel to the input end of the steam collecting pipeline (1), and are each equipped with a valve.

4. The waste heat boiler power plant steam recovery and utilization system according to claim 2, characterized in that: An input electric shut-off valve (103) and an input manual shut-off valve (104) are provided on the branches where the main steam input pipeline (101) and the vent steam input pipeline (102) are located. The input electric shut-off valve (103) is located on the output direction side of the input manual shut-off valve (104).

5. The waste heat boiler power plant steam recovery and utilization system according to claim 1, characterized in that: The steam control valve group (6) comprises a first steam manual valve (601), a first steam electric valve (602), and a second steam manual valve (603) which are connected in series on the steam pipeline (1) and are arranged in sequence along the fluid flow direction; a parallel branch is led out on the steam pipeline (1), and a third steam manual valve (604) is arranged on the parallel branch and is connected in parallel with the first steam manual valve (601), the first steam electric valve (602), and the second steam manual valve (603).

6. The waste heat boiler power plant steam recovery and utilization system according to claim 1, characterized in that: The external supply regulating valve group (7) comprises a first external supply manual valve (701), a first external electric pneumatic valve (702), and a second external supply manual valve (703) which are connected in series on the external supply pipeline (3) and are arranged in sequence along the flow direction of the fluid; a parallel branch is led out on the external supply pipeline (3), and a third external supply manual valve (704) is arranged on the parallel branch and is connected in parallel with the first external supply manual valve (701), the first external electric pneumatic valve (702), and the second external supply manual valve (703).

7. The waste heat boiler power plant steam recovery and utilization system according to claim 1, characterized in that: A pressure measuring element (8) and a temperature measuring element (9) are connected to the steam header (2).

8. The waste heat boiler power plant steam recovery and utilization system according to claim 1, characterized in that: An atmospheric exhaust pipeline (10) is arranged on the steam header (2).

9. The waste heat boiler power plant steam recovery and utilization system according to claim 1, characterized in that: A manual recovery shut-off valve is provided on the drain recovery pipeline (4).

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