Boiler steam transfer tank and secondary boiler system with same
By introducing a steam transfer tank of the liquid level adjustment device into the boiler system, the water level and steam pressure fluctuations caused by fluctuations in the boiler steam volume are solved, and water resources and heat energy are saved, ensuring the efficient operation of the boiler.
Patent Information
- Application Number
- CN202422361903.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-26
AI Technical Summary
When the steam volume fluctuates in existing boiler heat accumulators, the water level and steam pressure fluctuate, resulting in a reduction in combustion efficiency, and waste water resources and heat energy when drainage and water replenishment operations.
A steam transfer tank including a tank body, a steam inlet pipeline, a steam transmission pipeline, a drainage pipeline and a liquid level adjustment device is designed. The electric valve is automatically adjusted through a liquid level gauge and control system to realize the reuse of saturated water and the utilization of heat energy, and avoid bottom drainage.
The safe operation of steam transfer tanks is achieved, water resources are saved, thermal energy is fully utilized, boiler water level and steam pressure are stable, and combustion efficiency is improved.
Smart Images
Figure CN223216276U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of boilers, and particularly discloses a boiler steam transfer tank and a secondary boiler system with the transfer tank. Background Art
[0002] Regenerators are devices used in industrial boiler steam supply systems to store excess heat and release it when needed. Frequent and significant fluctuations in steam usage in these systems can not only cause fluctuations in boiler steam pressure and water level, making boiler operation difficult, but also reduce boiler combustion efficiency. In such situations, using a regenerator can effectively stabilize boiler loads, improve operating conditions, and prevent a decrease in boiler efficiency.
[0003] Boiler accumulators come in two types: variable-pressure and constant-pressure. The operating pressure of variable-pressure accumulators varies with the amount of stored heat, with steam accumulators being the most typical. Constant-pressure accumulators maintain a constant operating pressure, with feedwater accumulators being the most commonly used. Steam accumulators are the most widely used type of variable-pressure accumulator. When the boiler's evaporation rate exceeds steam demand, excess steam enters the accumulator to heat the stored water (saturated water), condensing the steam itself and causing the pressure in the accumulator to rise. When steam demand exceeds the boiler's evaporation rate, the saturated water in the accumulator boils due to the reduced pressure, providing steam to maintain a constant boiler load. This entire process is generally controlled by a set of regulating valves.
[0004] like Figure 1 As shown in the figure, a conventional steam accumulator is connected in parallel to the boiler's steam output pipeline. Valve V1 is installed upstream of the parallel pipeline, and valve V2 is installed downstream. Valve V1 controls the steam flow and pressure entering the accumulator, while valve V2 controls the steam flow and pressure at the accumulator's outlet. The accumulator pressure varies between these two levels. The greater the pressure difference between the accumulator's inlet and outlet pressures, the more heat the accumulator can store. Its capacity can be selected based on different situations.
[0005] When the water in the heat accumulator cannot produce saturated steam in response to pressure changes and deliver the steam in a timely manner, the liquid level in the heat accumulator will gradually rise. When it exceeds the safe water level of the heat accumulator, the bottom drain valve of the heat accumulator must be opened to promptly drain the excess water to maintain the appropriate water level in the heat accumulator. However, existing heat accumulators maintain the safe water level of the heat accumulator through bottom drainage. Because the water stored in the heat accumulator has a certain amount of heat, when the steam consumption increases sharply and the heat accumulator liquid level drops to a critical height, additional water needs to be added to the heat accumulator to maintain normal operation. This results in a large amount of water and heat energy waste, which is not conducive to energy conservation, environmental protection and cost control. Utility Model Content
[0006] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a boiler steam transfer tank and a secondary boiler system having the transfer tank.
[0007] On the one hand, the utility model discloses a two-stage boiler system with a transfer tank, which adopts the following technical solutions:
[0008] A two-stage boiler system with a transfer tank, comprising:
[0009] A saturated steam boiler, a steam transfer tank, a superheated steam boiler and a steam turbine connected in series;
[0010] The steam dump tank comprises:
[0011] Tank, used to store saturated water and steam;
[0012] a steam inlet pipeline, connecting the tank body with the steam outlet of the saturated steam boiler;
[0013] a steam transmission pipeline connecting the tank body to the steam inlet of the superheated steam boiler;
[0014] Drain pipe, connected to the bottom of the tank;
[0015] A liquid level regulating device comprises a delivery pipe, an electric regulating valve, a liquid level gauge and a control system; one end of the delivery pipe is connected to a drain pipe via an electric regulating valve, and the other end is connected to the steam transmission pipeline or the steam inlet of the superheated steam boiler; the liquid level gauge is installed in the tank body; the control system connects the electric regulating valve and the liquid level gauge with electrical signals, and controls the drainage of the electric regulating valve through feedback from the liquid level gauge.
[0016] Preferably, the system operates as follows:
[0017] The saturated steam boiler heats and evaporates water to form steam, which enters the tank through the steam inlet pipeline and is then transported through the steam transmission pipeline to the superheated steam boiler. The superheated steam boiler heats the saturated steam to a superheated state to form superheated steam, which is then transported to the steam turbine to generate electricity.
[0018] When the steam intake of the steam transfer tank is greater than the steam output, the excess steam condenses in the tank body to form saturated water. When the liquid level gauge detects that the saturated water is higher than the highest safe water level of the tank body, a feedback signal is sent to the control system. The control system opens the electric regulating valve to drain the liquid. The saturated water in the tank body enters the delivery pipeline and evaporates to form saturated steam, which is then delivered to the superheated steam boiler for heating to form superheated steam.
[0019] Preferably, the superheated steam boiler is a boiler operating at rated pressure and rated temperature.
[0020] Preferably, the delivery pipeline includes a main line and a bypass line; the electric regulating valve is installed on the main line, and manual stop valves are installed on both sides of the electric regulating valve; a bypass regulating valve is installed on the bypass line.
[0021] Preferably, a plurality of steam transfer tanks are provided in parallel between the saturated steam boiler and the superheated steam boiler.
[0022] Preferably, the steam transfer tank further comprises a water sample detection device and a sewage pipe, wherein the water sample detection device is connected to the sewage pipe and is equipped with a sampling control valve, and the sewage pipe is connected to the sewage pipe and is equipped with a sewage valve.
[0023] Preferably, the control system is electrically connected to the sampling control valve, the water sample detection device and the sampling control valve.
[0024] Preferably, the steam transfer tank further comprises an emergency drain pipe, which is connected to the tank body and is equipped with a drain valve.
[0025] Preferably, the steam transfer tank further comprises a water supply pipe, which is connected to the tank body and is equipped with a water supply valve.
[0026] On the other hand, the utility model discloses a steam transfer tank, which is a steam transfer tank used in the above-mentioned two-stage boiler system with a transfer tank.
[0027] Compared with the prior art, the present invention has at least the following beneficial effects:
[0028] 1. This solution provides a liquid level regulating device in the steam transfer tank to drain excess saturated water from the tank, ensuring safe operation of the steam transfer tank and convenient and simple control of the automation system.
[0029] 2. The liquid level regulating device of this solution can achieve the effect of steam water recycling and saturated water thermal energy utilization. It does not need to drain the bottom of the steam transfer tank to maintain the appropriate water level of the steam transfer tank, reducing the steam transfer tank drainage volume, saving water resources, and fully utilizing the thermal energy of saturated water.
[0030] 3. When the liquid level regulating device in this case recycles saturated steam, it will not cause impact on the upstream saturated steam boiler, thereby ensuring the stability of the steam pressure and water level of the saturated steam boiler and ensuring that the saturated steam boiler maintains high combustion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] Figure 1 It is a schematic diagram of the structure of a steam accumulator in the prior art;
[0032] Figure 2 This is a schematic structural diagram of the steam transfer tank of the present utility model;
[0033] Figure 3 This is a schematic diagram of the two-stage boiler system of the present utility model.
[0034] Description of Figure Numbers:
[0035] 1. Saturated steam boiler; 2. Steam transfer tank; 21. Tank body; 22. Steam inlet pipeline; 23. Steam transmission pipeline; 24. Drain pipe; 25. Drain valve; 26. Water supply pipe; 27. Emergency drain pipe; 3. Superheated steam boiler; 4. Liquid level control device; 41. Electric regulating valve; 42. Liquid level gauge; 43. Control system; 5. Water sampling device; 51. Sampling control valve. DETAILED DESCRIPTION
[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.
[0037] like Figure 1 As shown, conventional steam accumulators connected in parallel with the boiler's steam output pipeline can automatically evaporate saturated water and convert it into saturated steam for discharge under fluctuating air pressure, achieving the purpose of self-balancing boiler steam. However, this existing self-balancing principle of using steam accumulators in parallel with the steam output pipeline results in the evaporated saturated steam directly impacting the upstream boiler through the steam output pipeline if the discharged saturated water is reused in the downstream boiler, reducing the combustion efficiency of the saturated steam boiler and rendering the steam accumulator useless.
[0038] In order to address the drawback of the above-mentioned prior art that it is difficult to reuse excess saturated water resources, this embodiment discloses a boiler steam transfer tank and a two-stage boiler system having the transfer tank.
[0039] Reference Figure 2-3 The secondary boiler system includes a saturated steam boiler 1, a steam transfer tank 2, a superheated steam boiler 3, and a steam turbine, connected in series. The steam transfer tank 2 includes a tank body 21, a steam inlet pipeline 22, a steam transmission pipeline 23, a drain pipe 24, and a liquid level control device 4. Tank body 21 stores saturated water and steam; the steam inlet pipeline 22 connects tank body 21 to the steam outlet of the saturated steam boiler 1; the steam transmission pipeline 23 connects tank body 21 to the steam inlet of the superheated steam boiler 3; and the drain pipe 24 is connected to the bottom of tank body 21 to drain water.
[0040] The liquid level control device 4 includes a delivery pipeline, an electric control valve 41, a liquid level gauge 42, and a control system 43. One end of the delivery pipeline is connected to the drain pipe 24 via the electric control valve 41, and the other end is connected to the steam transmission pipeline (or directly to the steam inlet of the superheated steam boiler 3). The liquid level gauge 42 is installed in the tank 21. The liquid level gauge 42 is specifically a magnetic flap level gauge 42, which can feed back the liquid level reading to the control system 43. The control system 43 is electrically connected to the electric control valve and the liquid level gauge 42, and the feedback from the liquid level gauge 42 controls the electric control valve 41 to drain the water. The steam transfer tank 2 also includes a water supply pipe 26 and an emergency water discharge pipe 27. The water supply pipe 26 is connected to the tank body 21 and is equipped with a water supply valve. The emergency water discharge pipe 27 is connected to the tank body 21 and is equipped with a drain valve. When the water level in the tank body 21 surges and exceeds the most critical water level, workers can quickly lower the water level through the drain valve to ensure safe operation. When the water level in the tank body 21 drops to the minimum safe water level, workers can replenish water to the tank body 21 through the water supply valve.
[0041] Specifically, this solution is that 8 saturated steam boilers 1 with a rated pressure of 2.5 MPa are connected in parallel and collected into the steam transfer tank 2 through their respective steam outlet pipes. The steam transfer tank 2 can be provided with multiple parallel groups (in this embodiment) between the saturated steam boiler 1 and the superheated steam boiler 3. Figure 1 There are two groups in the design), the saturated steam is transported through the steam transfer tank 2 to a boiler with a rated pressure of 1.2MPa and a rated temperature of 320℃ for further heating into steam, and then transported to the steam turbine for power generation.
[0042] The pipeline in this solution consists of a main line and a bypass line. An electric control valve 41 is installed on the main line, with manual shutoff valves installed on either side. A bypass control valve is installed on the bypass line. The main line electric control valve 41 can adjust its opening to regulate the flow. If the electric control valve 41 malfunctions, the manual shutoff valves on either side can be closed to isolate the flow. When the main line malfunctions, the bypass control valve in the bypass line can be activated to resume operation.
[0043] In addition, the steam transfer tank 2 of this embodiment also includes a water sample detection device 5 and a drain pipe. The water sample detection device 5 is connected to the drain pipe 24 and is equipped with a sampling control valve 51. The drain pipe is connected to the drain pipe 24 and is equipped with a drain valve 25. The water sample detection device 5 is used to detect whether the water in the steam transfer tank 2 meets the standards. The operator determines whether the water source can be recycled based on the results of the sampling detection system. If the water sample does not meet the reuse standard, the drain valve 25 is controlled to drain the water in the tank body 21 through the drain pipe. As a preferred embodiment, the control system 43 electrically connects the sampling control valve 51, the water sample detection device 5, and the sampling control valve 51. The control system 43 regularly controls and detects water samples, and signals feedback that the water sample does not meet the standards and controls automatic drainage, thereby realizing automated management.
[0044] The operation process of the secondary boiler system of this scheme is as follows:
[0045] The saturated steam boiler 1 heats and evaporates water to form steam. The steam enters the tank 21 through the steam inlet pipe 22 and is then transported through the steam transmission pipe to the superheated steam boiler 3. The superheated steam boiler 3 heats the saturated steam to a superheated state to form superheated steam. The superheated steam is continuously or intermittently transported to the steam turbine for power generation.
[0046] When the steam output of the steam transfer tank 2 is greater than the steam input, the pressure in the tank body 21 decreases, causing the saturated water to evaporate and form saturated steam, which replenishes the shortfall in the steam input of the tank body 21.
[0047] When the steam intake of the steam transfer tank 2 is greater than the steam output, the excess steam condenses in the tank body 21 to form saturated water for storage;
[0048] When liquid level gauge 42 detects that the saturated water exceeds the maximum safe water level in tank 21 (generally 1 / 3-1 / 2 of the liquid level in tank 21), a feedback signal is sent to control system 43, which opens electric regulating valve 41 to drain the liquid. Driven by the pressure differential between the steam inlet and outlet of steam transfer tank 2, the saturated water in tank 21 enters the lower-pressure delivery pipeline. Due to the reduced pressure, it evaporates into saturated steam in the delivery pipeline and is then delivered to superheated steam boiler 3 for heating and superheated steam. When liquid level gauge 42 detects that the liquid level in tank 21 has returned to a safe range, control system 43 controls electric regulating valve 41 to reduce its opening or close it, stopping the delivery of saturated steam to superheated steam boiler 3.
[0049] The steam transfer tank 2 of this solution is provided with a liquid level regulating device 4, which not only serves to drain the excess saturated water in the tank body 21, ensuring the safe operation of the steam transfer tank 2 and convenient and simple control of the automation system, but also plays the role of recycling water for steam and utilizing the thermal energy of saturated water, reducing the drainage volume of the steam transfer tank 2, recycling qualified water, saving water resources, and making full use of the thermal energy of saturated water. At the same time, it will not cause an impact on the upper saturated steam boiler 1, thereby ensuring that the steam pressure and water level of the saturated steam boiler 1 are stable, and ensuring that the saturated steam boiler 1 maintains high combustion efficiency.
[0050] The technical solution provided by the present invention is introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.
Claims
1. A two-stage boiler system with a transfer tank, characterized in that: include: A saturated steam boiler, a steam transfer tank, a superheated steam boiler and a steam turbine connected in series; The steam dump tank comprises: Tank, used to store saturated water and steam; a steam inlet pipeline, connecting the tank body with the steam outlet of the saturated steam boiler; a steam transmission pipeline connecting the tank body to the steam inlet of the superheated steam boiler; Drain pipe, connected to the bottom of the tank; A liquid level regulating device comprises a delivery pipe, an electric regulating valve, a liquid level gauge and a control system; one end of the delivery pipe is connected to a drain pipe via an electric regulating valve, and the other end is connected to the steam transmission pipeline or the steam inlet of the superheated steam boiler; the liquid level gauge is installed in the tank body; the control system connects the electric regulating valve and the liquid level gauge with electrical signals, and controls the drainage of the electric regulating valve through feedback from the liquid level gauge.
2. The two-stage boiler system with a transfer tank according to claim 1, characterized in that: The superheated steam boiler is a boiler that operates at rated pressure and rated temperature.
3. The two-stage boiler system with a transfer tank according to claim 1, characterized in that: The delivery pipeline includes a main line and a bypass line; the electric regulating valve is installed on the main line, and manual stop valves are installed on both sides of the electric regulating valve; a bypass regulating valve is installed on the bypass line.
4. The two-stage boiler system with a transfer tank according to claim 1, characterized in that: The steam transfer tanks are provided in multiple groups in parallel between the saturated steam boiler and the superheated steam boiler.
5. The two-stage boiler system with a transfer tank according to claim 1, characterized in that: The steam transfer tank further comprises a water sample detection device and a sewage pipe. The water sample detection device is connected to the sewage pipe and is equipped with a sampling control valve. The sewage pipe is connected to the sewage pipe and is equipped with a sewage valve.
6. The two-stage boiler system with a transfer tank according to claim 5, characterized in that: The control system is electrically connected to the sampling control valve, the water sample detection device and the sampling control valve.
7. The two-stage boiler system with a transfer tank according to claim 1, characterized in that: The steam transfer tank further comprises an emergency drain pipe, which is connected to the tank body and is equipped with a drain valve.
8. The two-stage boiler system with a transfer tank according to claim 1, characterized in that: The steam transfer tank further comprises a water supply pipe, which is connected to the tank body and is equipped with a water supply valve.
9. A boiler steam dump tank, characterized in that: The steam transfer tank is used in the two-stage boiler system with a transfer tank as described in any one of claims 1 to 8.