Front natural gas heating device

Abstract

The utility model provides a front natural gas heating device which comprises a front heater, a main pipeline and a bypass pipeline. The main pipeline comprises an upstream main pipeline and a downstream main pipeline; one end of the pre-heater is connected with the upstream main pipeline, and the other end of the pre-heater is connected with the downstream main pipeline; an inlet isolating valve is arranged on the upstream main pipeline, and an outlet isolating valve is arranged on the downstream main pipeline; the front heater comprises a shell and a gas coil pipe arranged in the shell; two ends of the gas coil pipe are respectively communicated with the upstream main pipeline and the downstream main pipeline; a gas side deflation valve is also arranged on the front heater and is connected with the gas coil pipe through a pipeline; one side of the shell is connected with a water inlet pipe, and a water inlet isolation valve is arranged on the water inlet pipe; a water return pipe is arranged on the other side of the shell, and a water return isolation valve is arranged on the water return pipe; the natural gas preheating device can utilize circulating water to preheat natural gas.

Description

Technical Field

[0001] The utility model relates to a heating device, in particular to a natural gas preheating device. Background Art

[0002] A gas-fired power plant is a circulating system that utilizes a gas unit (gas turbine and generator), a waste heat boiler, and a steam unit (steam turbine and generator). It recovers the high-temperature exhaust gas discharged from the gas turbine through a waste heat boiler and converts it into steam, which is then injected into the steam turbine to generate electricity.

[0003] When the temperature is low in winter, the temperature of natural gas is also low, and the natural gas temperature cannot meet the startup requirements, so the natural gas needs to be preheated.

[0004] A heat exchanger is usually installed at the rear stage of the steam turbine to convert the remaining steam into circulating water; on the one hand, the circulating water can be reused in the waste heat boiler, and on the other hand, it can be used to preheat natural gas. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a natural gas preheating device that can preheat natural gas using circulating water, so that the natural gas entering the gas generator set can maintain a high temperature in cold weather. To achieve the above technical objectives, the technical solutions adopted by the present invention are:

[0006] The embodiment of the utility model provides a natural gas preheating device, comprising a preheater, a main pipeline and a bypass pipeline; the main pipeline comprises an upstream main pipeline and a downstream main pipeline;

[0007] One end of the preheater is connected to the upstream main pipeline, and the other end is connected to the downstream main pipeline; an inlet isolation valve is provided on the upstream main pipeline, and an outlet isolation valve is provided on the downstream main pipeline;

[0008] The preheater includes a shell and an air coil disposed within the shell; the two ends of the air coil are respectively connected to the upstream main pipeline and the downstream main pipeline; the preheater is also provided with an air-side air release valve, which is connected to the air coil via a pipeline; one side of the shell is connected to the water inlet pipe, which is provided with a water inlet isolation valve; the other side of the shell is provided with a return pipe, which is provided with a return water isolation valve;

[0009] A bypass isolation valve is provided on the bypass pipeline;

[0010] One end of the bypass pipeline is communicated with one end of the upstream main pipeline upstream of the inlet isolation valve, and the other end of the bypass pipeline is communicated with one end of the downstream main pipeline downstream of the outlet isolation valve.

[0011] Furthermore, the natural gas preheating device also includes a water side safety valve and a first pre-isolating valve; the water side safety valve is connected to the shell through a pipeline, and the first pre-isolating valve is installed on the pipeline between the water side safety valve and the shell.

[0012] Furthermore, the natural gas preheating device also includes a gas side safety valve, which is connected to the downstream main pipeline upstream of the outlet isolation valve through a pipeline, and a second pre-isolating valve is also provided between the gas side safety valve and the downstream main pipeline.

[0013] Furthermore, the natural gas preheating device also includes a water-side drain valve, which is connected to the shell through a pipeline.

[0014] Furthermore, the natural gas preheating device also includes a gas-side drain valve, which is connected to the gas coil in the shell through a pipeline.

[0015] The technical solution provided by the embodiment of the present invention has the beneficial effects of: in cold winter, when the natural gas inlet temperature is low, it can ensure that the natural gas temperature meets the startup requirements when the gas unit is ignited, thereby ensuring the smooth startup of the unit; and it can also maintain a high natural gas temperature during the operation of the unit, thereby improving the efficiency of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the preheating device in an embodiment of the present utility model. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] like Figure 1 As shown, a natural gas preheating device proposed in an embodiment of the present invention includes a preheater 3, a main pipeline 15 and a bypass pipeline 14; the main pipeline 15 includes an upstream main pipeline 151 and a downstream main pipeline 152;

[0019] One end of the preheater 3 is connected to the upstream main pipeline 151, and the other end is connected to the downstream main pipeline 152; an inlet isolation valve 1 is provided on the upstream main pipeline 151, and an outlet isolation valve 11 is provided on the downstream main pipeline 152;

[0020] The preheater 3 includes a housing 31 and an air coil 32 disposed within the housing 31; the ends of the air coil 32 are connected to the upstream main pipeline 151 and the downstream main pipeline 152, respectively. The preheater 3 is also provided with an air-side air release valve 5, which is connected to the air coil 32 via a pipeline. One side of the housing 31 is connected to the water inlet pipe, which is provided with a water inlet isolation valve 13; the other side of the housing 31 is provided with a water return pipe, which is provided with a return water isolation valve 8.

[0021] The bypass pipe 14 is provided with a bypass isolation valve 12;

[0022] One end of the bypass pipeline 14 is connected to one end of the upstream main pipeline 151 upstream of the inlet isolation valve 1 , and the other end of the bypass pipeline 14 is connected to one end of the downstream main pipeline 152 downstream of the outlet isolation valve 11 .

[0023] When the temperature is low in winter, the natural gas can be preheated by the preheater 3; the bypass isolation valve 12 is closed; the inlet isolation valve 1 and the gas-side air release valve 5 are opened and the outlet isolation valve 11 is closed, and the natural gas is passed into the preheater 3, and the air in the gas coil 32 is first discharged, and then the gas-side air release valve 5 is closed and the outlet isolation valve 11 is opened; at the same time, the water inlet isolation valve 13 and the return water isolation valve 8 are opened, and the circulating water enters the shell 31 from the water inlet pipe, preheats the natural gas flowing through the gas coil 32, and then enters the return water pipe; the water temperature of the circulating water is about 38°C, which can heat the natural gas to about 28°C, which not only meets the natural gas temperature requirement when the gas unit is started, but also improves the unit efficiency.

[0024] More preferably, the natural gas preheating device also includes a water-side safety valve 7 and a first pre-isolating valve 6; the water-side safety valve 7 is connected to the shell 31 through a pipeline, and the first pre-isolating valve 6 is installed on the pipeline between the water-side safety valve 7 and the shell 31; the water-side safety valve 7 is a pressure relief valve that can prevent the water pressure in the shell 31 from being too high; after the first pre-isolating valve 6 is closed, it is convenient to inspect or replace the water-side safety valve 7.

[0025] More preferably, the natural gas preheating device also includes a gas-side safety valve 10, which is connected to the downstream main pipeline 152 upstream of the outlet isolation valve 11 through a pipeline, and a second pre-isolating valve 9 is also provided between the gas-side safety valve 10 and the downstream main pipeline 152; the gas-side safety valve 10 is also a pressure relief valve, which can prevent the gas pressure in the main pipeline 15 from being too high; after the second pre-isolating valve 9 is closed, it is convenient to inspect or replace the gas-side safety valve 10.

[0026] More preferably, the natural gas preheating device further comprises a water-side drain valve 4 , which is connected to the housing 31 via a pipeline; after a long period of use, the water-side drain valve 4 can be opened to discharge impurities in the housing 31 .

[0027] More preferably, the natural gas preheating device further comprises an air-side drain valve 2 , which is connected to the gas coil 32 in the shell 31 through a pipeline; after a long period of use, the air-side drain valve 2 can be opened to discharge impurities in the gas coil 32 .

[0028] When the temperature is high, the inlet isolation valve 1 and the outlet isolation valve 11 can be closed, and the bypass isolation valve 12 can be opened. The natural gas does not need to be heated by the preheater 3 and can directly flow to the next level of filtration system.

[0029] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A natural gas preheating device, characterized in that: It comprises a preheater (3), a main pipeline (15) and a bypass pipeline (14); the main pipeline (15) comprises an upstream main pipeline (151) and a downstream main pipeline (152); One end of the preheater (3) is connected to an upstream main pipeline (151), and the other end is connected to a downstream main pipeline (152); an inlet isolation valve (1) is provided on the upstream main pipeline (151), and an outlet isolation valve (11) is provided on the downstream main pipeline (152); The preheater (3) comprises a shell (31) and an air coil (32) arranged in the shell (31); the two ends of the air coil (32) are respectively connected to the upstream main pipeline (151) and the downstream main pipeline (152); the preheater (3) is also provided with an air-side air release valve (5), and the air-side air release valve (5) is connected to the air coil (32) through a pipeline; one side of the shell (31) is connected to the water inlet pipe, and the water inlet pipe is provided with a water inlet isolation valve (13); the other side of the shell (31) is provided with a water return pipe, and the return pipe is provided with a return water isolation valve (8); The bypass pipeline (14) is provided with a bypass isolation valve (12); One end of the bypass pipeline (14) is communicated with one end of the upstream main pipeline (151) upstream of the inlet isolation valve (1), and the other end of the bypass pipeline (14) is communicated with one end of the downstream main pipeline (152) downstream of the outlet isolation valve (11).

2. The natural gas preheating device according to claim 1, characterized in that: The natural gas preheating device further comprises a water-side safety valve (7) and a first pre-isolating valve (6); the water-side safety valve (7) is connected to the housing (31) via a pipeline, and the first pre-isolating valve (6) is installed on the pipeline between the water-side safety valve (7) and the housing (31).

3. The natural gas preheating device according to claim 1, characterized in that: The natural gas preheating device further comprises a gas-side safety valve (10), the gas-side safety valve (10) being connected to a downstream main pipeline (152) upstream of the outlet isolation valve (11) via a pipeline, and a second pre-isolating valve (9) being provided between the gas-side safety valve (10) and the downstream main pipeline (152).

4. The natural gas preheating device according to claim 1, characterized in that: The natural gas preheating device further comprises a water-side drain valve (4), which is connected to the housing (31) via a pipeline.

5. The natural gas preheating device according to claim 1, characterized in that: The natural gas preheating device further comprises a gas-side drain valve (2), which is connected to the gas coil (32) in the housing (31) via a pipeline.

Images