Instrument heat tracing energy-saving device

Abstract

The utility model discloses an instrument heat tracing energy-saving device which comprises a high-temperature waste water storage tank, a first water feeding pump, an instrument pipeline, a heat tracing pipeline, a buffer tank and a second water feeding pump. The water outlet end of the first water feeding pump is connected with the water inlet end of the buffer tank through a first branch pipe and a second branch pipe, the instrument pipeline is sleeved with the heat tracing pipeline, the water outlet end of the heat tracing pipeline is connected with the water inlet end of the buffer tank, and the water outlet end of the buffer tank is connected with the water inlet end of the second water feeding pump. And the water outlet end of the second water feeding pump is connected with an external wastewater treatment device. According to the device, waste heat in boiler waste water is used for heat tracing of the instrument, the resource utilization efficiency is improved, the problems that traditional electric heat tracing is large in energy consumption and prone to damage are solved, the enterprise operation cost is reduced, and good practicability is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of instrument tracing, and particularly relates to an energy-saving device for instrument tracing. Background Technique

[0002] At present, in the tracing project of boiler instrument sampling pipes, electric heating for tracing has been widely used as an effective pipeline (storage tank) heat preservation and anti-freezing solution. Its working principle is that a certain amount of heat is dissipated by the tracing medium, and the heat loss of the traced pipeline is supplemented through direct or indirect heat exchange to achieve the purpose of heating up, heat preservation or anti-freezing. Although electric tracing is convenient to install, its disadvantages are also obvious. Its controllable temperature range varies with the electric tracing belt, and its control temperature range is determined by the material of the electric tracing belt and cannot be used beyond the limit. In addition, when electric tracing is installed on the currently relatively high-temperature instrument measurement pipeline (steam pipeline), it is inevitable that the electric tracing belt will be damaged by the high temperature inside the instrument measurement pipeline. Especially when the instrument measurement pipeline is regularly drained, this problem is more likely to occur. After the electric tracing belt is damaged, the internal wire will be short-circuited, causing the entire electric tracing belt to lose its heating effect. And because a 30-mm heat preservation layer needs to be made after the electric tracing belt is installed on the instrument measurement pipeline, when the electric tracing belt is damaged and short-circuited, it cannot be detected in time, which may cause the instrument measurement pipeline to freeze in winter, resulting in inaccurate measurement. Content of the Utility Model

[0003] The purpose of the utility model is to provide an energy-saving device for instrument tracing to solve the problems existing in the above background technique.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme:

[0005] An energy-saving device for instrument tracing, characterized in that it includes a high-temperature waste water storage tank, a first feed pump, an instrument pipeline, a tracing pipeline, a buffer tank and a second feed pump. The water outlet end of the high-temperature waste water storage tank is connected to the water inlet end of the first feed pump. The water outlet end of the first feed pump is respectively connected to the water inlet ends of the tracing pipeline and the buffer tank through a first branch pipe and a second branch pipe. The tracing pipeline is sleeved on the instrument pipeline, and the water outlet end of the tracing pipeline is connected to the water inlet end of the buffer tank. The water outlet end of the buffer tank is connected to the water inlet end of the second feed pump. The water outlet end of the second feed pump is connected to an external waste water treatment device.

[0006] Further, a first stop valve is installed on the first branch pipe, a second stop valve is installed on the second branch pipe, and a cleaning water pipe is connected to the downstream side of the second stop valve. A third stop valve is installed on the cleaning water pipe.

[0007] Furthermore, the outer side of the instrument pipeline and the inner side of the heating pipeline are both provided with a water-proof corrosion layer, and the outer side of the heating pipeline is provided with a thermal insulation layer. The water-proof corrosion layer is a plastic layer, and the thermal insulation layer is a rubber-plastic foam layer.

[0008] Compared with the prior art, the present invention has the following beneficial effects:

[0009] The instrument heating device of the utility model utilizes the waste heat in the boiler wastewater to heat the instrument, thereby improving the resource utilization efficiency, solving the problems of high energy consumption and easy damage of traditional electric heating, reducing the operating costs of the enterprise, and having good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a structural diagram of the present utility model.

[0011] In the figure, 1-high-temperature wastewater storage tank, 2-first water feed pump, 3-first stop valve, 4-second stop valve, 5-third stop valve, 6-instrument pipeline, 7-heating pipeline, 8-buffer tank, 9-second water feed pump. DETAILED DESCRIPTION

[0012] To ensure boiler water quality during daily operation, waste heat boilers require continuous and periodic blowdowns. Continuous blowdown, also known as surface blowdown, continuously removes the most concentrated water from the surface layer of the drum water to reduce salt and alkalinity, preventing excessive water concentration from affecting steam quality. Periodic blowdown, also known as intermittent or bottom blowdown, removes accumulated slag and soft sediment formed after phosphate treatment in the lower portion of the boiler. Our plant's waste heat boiler has a rated evaporation capacity of 25 t / h. The continuous blowdown rate is 2% of the rated evaporation rate, and the periodic blowdown rate is 1% of the rated evaporation rate. Based on the daily evaporation rate of the waste heat boiler, we can calculate that the daily blowdown rate of one waste heat boiler is 18 t. Our plant currently operates two waste heat boilers of the same model, with a daily blowdown rate of approximately 36 t. All discharged water is collected in a cooling well and cooled before use. The current treatment method is to precipitate, separate, purify and deoxygenate this part of the wastewater and then reuse it as boiler system water. The heat energy in the wastewater is not effectively utilized, resulting in a waste of available resources.

[0013] In view of this, the utility model utilizes the heat energy in the wastewater to heat the instrument pipeline, so as to realize the recycling of heat energy resources and solve the problem of high energy consumption and easy damage of electric heating.

[0014] like Figure 1As shown in the figure, an instrument tracing energy-saving device includes a high-temperature wastewater storage tank 1, a first feed pump 2, an instrument pipeline 6, a tracing pipeline 7, a buffer tank 8, and a second feed pump 9. The water outlet end of the high-temperature wastewater storage tank 1 is connected to the water inlet end of the first feed pump 2. The water outlet end of the first feed pump 2 is respectively connected with a first branch pipe and a second branch pipe. The first branch pipe is connected to the water inlet end of the buffer tank 8 and a first stop valve 3 is installed on the first branch pipe. The second branch pipe is connected to the tracing pipeline 7 and a second stop valve 4 is installed on the second branch pipe. The tracing pipeline 7 is sleeved on the instrument pipeline 6, and the water outlet end of the tracing pipeline 7 is connected to the water inlet end of the buffer tank 8. The water outlet end of the buffer tank 8 is connected to the second feed pump 9.

[0015] To clean the calcium and magnesium precipitates accumulated in the tracing pipeline in time and ensure the heat transfer effect, a cleaning water pipe is connected to the downstream side of the second stop valve 4, and a third stop valve 5 is installed on the cleaning water pipe.

[0016] At the same time, to prevent water erosion and avoid heat dissipation, a water erosion prevention layer is provided on the outer side of the instrument pipeline 6 and the inner side of the tracing pipeline 7, and a heat insulation layer is provided on the outer side of the tracing pipeline 7. Specifically, the water erosion prevention layer is a plastic layer, and the heat insulation layer is a rubber and plastic foam layer.

[0017] The specific working process of the present utility model is as follows:

[0018] First, send the boiler wastewater that has been simply filtered to remove insoluble impurities into the high-temperature wastewater storage tank 1. Open the first feed pump 2 and the second stop valve 4, and pump the high-temperature wastewater into the tracing pipeline 7 to trace the instrument pipeline 6. The high-temperature wastewater after heat exchange enters the buffer tank 8, and is pumped by the second feed pump 9 to the backend wastewater treatment system for sediment separation, purification, and deoxidation, and then returns to the boiler makeup water system for secondary utilization. After running for a period of time, close the second stop valve 4, open the first stop valve 3 and the third stop valve 5. The boiler wastewater directly enters the buffer tank 8, and the high-temperature weak acid cleaning water is pumped into the tracing pipeline 7 through the cleaning water pipe to wash the calcium and magnesium soft precipitates deposited on the surface of the instrument pipeline 6 and inside the tracing pipeline 7. The washing water flows into the buffer tank 8 together for centralized treatment. After cleaning, close the first stop valve 3 and the third stop valve 5, and continue to open the second stop valve 4 for instrument tracing, and so on in a cycle.

[0019] In summary, the present utility model utilizes the waste heat in the boiler wastewater to trace the instrument, improves the resource utilization efficiency, solves the problems of high energy consumption and easy damage of traditional electric tracing, reduces the enterprise operation cost, and has good practicability.

Claims

1. An instrument tracing energy-saving device, characterized in that It includes a high-temperature wastewater storage tank (1), a first feed pump (2), an instrument pipeline (6), a tracing pipeline (7), a buffer tank (8) and a second feed pump (9). The water outlet end of the high-temperature wastewater storage tank (1) is connected to the water inlet end of the first feed pump (2). The water outlet end of the first feed pump (2) is respectively connected to the water inlet ends of the tracing pipeline (7) and the buffer tank (8) through a first branch pipe and a second branch pipe. The tracing pipeline (7) is sleeved on the instrument pipeline (6), and the water outlet end of the tracing pipeline (7) is connected to the water inlet end of the buffer tank (8). The water outlet end of the buffer tank (8) is connected to the second feed pump (9).

2. The instrument tracing energy-saving device according to claim 1, characterized in that, A first stop valve (3) is installed on the first branch pipe, a second stop valve (4) is installed on the second branch pipe, and a cleaning water pipe is connected to the downstream side of the second stop valve (4). A third stop valve (5) is installed on the cleaning water pipe.

3. The instrument tracing energy-saving device according to claim 1, characterized in that, A water erosion prevention layer is provided on the outer side of the instrument pipeline (6) and the inner side of the tracing pipeline (7), and a heat insulation layer is provided on the outer side of the tracing pipeline (7).

4. The instrument tracing energy-saving device according to claim 3, characterized in that, The water erosion prevention layer is a plastic layer, and the heat insulation layer is a rubber and plastic foam layer.

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