Novel steam energy-saving system
By introducing a system with flash tank and adjustable jet pump into the steam heat exchange equipment, the closed recovery of condensate water and the reuse of low-pressure steam are achieved, and the problems of condensate residue and energy waste in the steam heat exchange equipment are solved, thereby improving the The energy efficiency of the system and the stability of the equipment.
Patent Information
- Application Number
- CN202420721756.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-09
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-09
AI Technical Summary
There are problems such as condensate residue in existing steam heat exchange equipment, slow drainage of the hydrophobic device, difficulty in recycling low-pressure steam, excessive back pressure, resulting in waste of energy and equipment damage.
The steam energy-saving system including a flash tank and an adjustable jet pump is adopted. Through the use of gas-liquid separation and pressure difference, the closed recovery of condensed water and the reuse of low-pressure steam is achieved, reducing steam consumption and improving heat exchange efficiency.
It effectively solves the problems of condensate recycling and steam waste, improves heat exchange efficiency and system energy efficiency, and reduces equipment damage and maintenance costs.
Smart Images
Figure CN222187875U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a novel steam energy-saving technology, and more specifically to a novel steam energy-saving system. Background Art
[0002] At present, heat exchange equipment, such as heat exchange units, preheaters, etc., and jacket heating equipment such as distillation towers, reactors, extraction tanks, etc. use steam as a heat energy medium. After heat exchange, the steam forms steam condensate and is discharged.
[0003] A steam trap is installed at the outlet of the steam heating equipment to continuously discharge the steam condensate in the jacket to the outside of the equipment. This form of heat exchange has many problems: condensate residue, slow drainage reaction of the steam trap, and a certain amount of condensate residue in the jacket, which affects the heat exchange efficiency. Low-pressure steam causes the back pressure of the condensate recovery system to increase, affecting the normal discharge of condensate from the extraction tank, resulting in uneven temperature in the tank and unqualified heated products. It causes steam waste, and there are problems such as steam entrainment when the steam trap discharges condensate, resulting in energy waste. When the back pressure is too high and affects production, bypass direct discharge has to be used, resulting in a large amount of heat energy waste. It is easy to form a water film, and the heat exchange surface of the heat exchange equipment is very easy to form a water film, which affects the heat exchange efficiency. It causes damage to the extraction tank and the distillation tower heat exchanger. The condensate contains a large amount of condensate vapor-water mixture, which is easy to cause water hammer in the extraction tank, and then damage the jacket of the extraction tank and the steam trap. Utility Model Content
[0004] The purpose of the utility model is to overcome the deficiencies in the prior art, provide a new type of steam energy-saving system, solve the problems existing in the existing heat exchange form, improve the heat exchange efficiency, reduce the harm of steam condensate, and improve the energy saving of the steam thermal system.
[0005] The purpose of the utility model is achieved through the following technical solutions.
[0006] The utility model steam energy-saving system comprises a heat exchange device, wherein a flash tank for gas-liquid separation and an adjustable jet pump for increasing steam pressure are connected between a heat exchange medium outlet and a heat exchange medium inlet of the heat exchange device through a pipeline;
[0007] The material inlet of the flash tank is connected to the heat exchange medium outlet of the heat exchange equipment through a pipeline, a condensate pump is arranged on the pipeline connected to the liquid outlet at the bottom of the flash tank, the steam outlet at the top of the flash tank is connected to the low-pressure steam inlet of the adjustable jet pump through a pipeline, the high-pressure steam inlet of the adjustable jet pump is connected to the steam thermal system through a pipeline, and the steam outlet of the adjustable jet pump is connected to the heat exchange medium inlet of the heat exchange equipment through a pipeline.
[0008] A safety valve and a pressure relief valve are arranged on the top of the flash tank, and a liquid level sensor and a No. 1 pressure transmitter are arranged on the flash tank. The liquid level sensor and the No. 1 pressure transmitter are electrically connected to the condensate pump and the pressure relief valve respectively for interlock control.
[0009] A No. 2 pressure transmitter is provided on the pipeline connecting the steam outlet of the adjustable jet pump and the heat exchange medium inlet of the heat exchange device. The No. 2 pressure transmitter is electrically connected to the adjustable jet pump for interlock control.
[0010] Compared with the prior art, the beneficial effects brought by the technical solution of the utility model are:
[0011] (1) The utility model adds an adjustable jet pump at the inlet of the heat exchange equipment, removes the existing steam trap at the condensate outlet, pressurizes the low-pressure steam generated by the condensate into the heat exchange equipment for reuse, maximizes the use of the latent heat of vaporization contained in the steam, and saves steam consumption. The utility model effectively solves the contradiction that has long plagued the recovery of low-pressure steam in condensate. The utility model can not only achieve full closed recovery of condensate, but also recover and distribute the low-pressure steam in the condensate through separation, suction, and pressurization as new steam required by the process for use by other steam equipment. It not only effectively guarantees the normal operation of the condensate system of the heat exchange equipment, but also greatly reduces the consumption of power steam, making the operation energy efficiency of the steam thermal system optimal.
[0012] (2) The adjustable jet pump used in the utility model has a suction force at the steam outlet, which brings the following advantages: the water film on the heat exchange surface in the heat exchange equipment becomes thinner, and the heat exchange efficiency is improved; less condensed water remains in the heating chamber of the heat exchange equipment, and the heating temperature is consistent; the steam in the heat exchange equipment changes from laminar flow to vortex flow, and the heat exchange efficiency is improved; less condensed water remains in the heating chamber of the heat exchange equipment, and there is no water hammer phenomenon; the heat exchange equipment reduces the number of steam traps and pressure reducing valves, saving equipment investment and maintenance costs
[0013] (3) The high-pressure steam and low-pressure steam of the steam thermal system enter the adjustable jet pump at the same time. Through the pressure difference between the high-pressure steam and the low-pressure steam, the low-pressure steam is recovered and reused to achieve a mixed cycle, thereby achieving energy saving. The pressure transmitter feeds back the pressure signal, and the adjustable jet pump accurately adjusts the jet flow of the high-pressure steam, thereby accurately controlling the required pressure at the steam outlet. The adjustable jet pump has adaptive adjustment capabilities and comes with a PID adjustment control actuator. By detecting the output pressure and controlling the actuator to act through PID adjustment, the flow rate of the high-pressure steam can be changed, and the optimal low-pressure steam recovery effect can be maintained within the jet pump characteristic curve. The steam outlet of the adjustable jet pump provides the steam medium with the pressure required by the heat exchange equipment, which is transported to the heat exchange equipment through a pipeline, achieving the effect of low-pressure steam recovery and steam energy saving.
[0014] (4) The utility model adopts a flash tank. The condensate after heat exchange by the heat exchange equipment contains a large amount of low-pressure steam. Gas-liquid separation is performed inside the flash tank. The liquid remains inside the flash tank, and the low-pressure steam enters the adjustable jet pump. The liquid level sensor monitors the liquid level in the flash tank in real time. When the set height is reached, the condensate pump is started to transport the liquid condensate in the flash tank to the designated location. The No. 1 pressure transmitter monitors the pressure in the flash tank in real time. When the pressure in the tank is too high, the pressure will be adjusted by opening the pressure relief valve. When the pressure relief valve works abnormally, the safety valve can be mechanically opened to provide overpressure safety. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a schematic diagram of the steam energy-saving system of the utility model.
[0016] Figure numerals: 1-heat exchange equipment, 2-flash tank, 201-liquid level sensor, 202-pressure transmitter, 203-safety valve, 204-pressure relief valve, 3-condensate pump, 4-adjustable jet pump, 401-low-pressure steam inlet, 402-high-pressure steam inlet, 403-steam outlet, 5-pressure transmitter. DETAILED DESCRIPTION
[0017] The utility model is further described below in conjunction with the accompanying drawings.
[0018] like Figure 1 As shown, the steam energy-saving system of the utility model mainly includes a heat exchange device 1, a flash tank 2, and an adjustable jet pump 3. The heat exchange device 1 is provided with a heat exchange medium inlet, a heat exchange medium outlet, a working fluid inlet, and a working fluid outlet. Hot fluid flows between the heat exchange medium inlet and the heat exchange medium outlet, and cold fluid flows between the working fluid inlet and the working fluid outlet, such as the cold fluid of a distillation tower or other equipment.
[0019] A flash tank 2 for gas-liquid separation and an adjustable jet pump 4 for increasing steam pressure are connected between the heat exchange medium outlet and the heat exchange medium inlet of the heat exchange device 1 through a pipeline. Valves may be provided at the heat exchange medium outlet and the heat exchange medium inlet of the heat exchange device 1, respectively.
[0020] The material inlet of the flash tank 2 is connected to the heat exchange medium outlet of the heat exchange device 1 through a pipeline, and a condensate pump 3 is arranged on the pipeline connected to the liquid outlet at the bottom of the flash tank 2. A safety valve 203 and a pressure relief valve 204 are installed on the top of the flash tank 1. The flash tank 2 is also equipped with a liquid level sensor 201 and a No. 1 pressure transmitter 202. The liquid level sensor 201 is electrically connected to the condensate pump 3 for interlock control; the No. 1 pressure transmitter 202 is electrically connected to the pressure relief valve 204 for interlock control.
[0021] The adjustable jet pump 4 includes a low-pressure steam inlet 401, a high-pressure steam inlet 402, and a steam outlet 403. The low-pressure steam inlet 401 of the adjustable jet pump 4 is connected to the steam outlet at the top of the flash tank 2 through a pipeline, the high-pressure steam inlet 402 of the adjustable jet pump 4 is connected to the steam thermal system through a pipeline, and the steam outlet 403 of the adjustable jet pump 4 is connected to the heat exchange medium inlet of the heat exchange device 1 through a pipeline. A No. 2 pressure transmitter 5 is provided on the pipeline connecting the steam outlet 403 of the adjustable jet pump 4 and the heat exchange medium inlet of the heat exchange device 1, and the No. 2 pressure transmitter 5 is electrically connected to the adjustable jet pump 4 for interlocking control. Specifically, the No. 2 pressure transmitter 5 is electrically connected to the PID regulation control actuator of the adjustable jet pump 4.
[0022] The specific working principle of the utility model steam energy-saving system:
[0023] The condensate after heat exchange of the heat exchange equipment 1 contains a large amount of low-pressure steam, which enters the flash tank 2 through the pipeline, and performs gas-liquid separation inside the flash tank 2, wherein the liquid remains inside the flash tank 2, and the low-pressure steam enters the adjustable jet pump 4 through the pipeline via the low-pressure steam inlet 401. The liquid level sensor 201 monitors the liquid level in the flash tank 2 in real time, and starts the condensate pump 3 after reaching the set height to transport the liquid condensate in the flash tank 2 to the designated location. The No. 1 pressure transmitter 202 monitors the pressure in the flash tank 2 in real time. If the pressure in the tank is too high, it will affect the discharge of the condensate of the heat exchange equipment 1 and affect the heat exchange. Therefore, when the pressure is too high (i.e., exceeds the set pressure value), the pressure will be adjusted by opening the pressure relief valve 204. The flash tank 2 is also equipped with a safety valve 203. When the pressure relief valve 204 works abnormally, the safety valve 203 can be mechanically opened to provide overpressure safety protection.
[0024] The high-pressure steam of the steam thermal system enters the adjustable jet pump 4 through the high-pressure steam inlet 402. The adjustable jet pump 4 technology utilizes the Venturi effect to recover and reuse the low-pressure steam through the pressure difference between the high-pressure steam and the low-pressure steam, realizes a mixed cycle, and thus achieves the effect of energy saving. The adjustable jet pump 4 feeds back the pressure signal through the pressure transmitter 5 at the steam outlet 403, accurately adjusts the jet flow of the high-pressure steam, and then accurately controls the required pressure at the steam outlet 403. The low-pressure steam in the condensate is a dynamic variable. During operation, the adjustable jet pump 4 must be able to adapt to changes in the system working conditions. The adjustable jet pump 4 has adaptive adjustment capabilities and comes with a PID adjustment control actuator. By detecting the output pressure and controlling the actuator to act through the PID adjustment control, the flow of the high-pressure steam can be changed, and the best low-pressure steam recovery effect can be maintained within the jet pump characteristic curve.
[0025] The steam outlet 403 of the adjustable jet pump 4 provides the steam medium of the pressure required by the heat exchange device 1 and is transported to the heat exchange device 1 through a pipeline, thereby achieving the effect of low-pressure steam recovery and steam energy saving.
[0026] Among them, low-pressure steam refers to flash steam and blow-by steam contained in steam condensate; flash steam refers to steam flashed out during the pressure reduction process of high-temperature saturated water discharged from heat exchange equipment 1; blow-by steam refers to steam that has not been completely cooled to condensate in heat exchange equipment 1. High-pressure steam comes from the plant's steam thermal system, and its pressure is higher than the pressure at the low-pressure steam inlet.
[0027] The utility model adds an adjustable jet pump 4 at the heat exchange medium inlet of the heat exchange equipment 1, removes the steam trap at the existing condensate outlet (i.e., the heat exchange medium outlet), pressurizes the low-pressure steam generated by the condensate into the heat exchange equipment 1 for reuse, and uses the latent heat of vaporization contained in the steam at the maximum proportion, saving steam consumption. The utility model effectively solves the contradiction that has long plagued the recovery of low-pressure steam in condensate recovery. It can not only realize the full closed recovery of condensate, but also recover the low-pressure steam in the condensate through separation, suction, and pressurization. It is distributed as new steam required by the process for use by other steam equipment. It not only effectively guarantees the normal operation of the condensate system of the heat exchange equipment, but also greatly reduces the consumption of power steam, making the operation energy efficiency of the steam thermal system optimal.
[0028] The adjustable jet pump 4 in the utility model increases the suction force at the steam outlet, which can effectively solve the existing problems. The advantages are: the water film on the heat exchange surface in the heat exchange device 1 becomes thinner, and the heat exchange efficiency is improved; less condensed water remains in the heating chamber of the heat exchange device 1, and the heating temperature is consistent; the steam in the heat exchange device 1 changes from laminar flow to vortex flow, and the heat exchange efficiency is improved; less condensed water remains in the heating chamber of the heat exchange device 1, and there is no water hammer phenomenon; the heat exchange device 1 reduces the number of steam traps and pressure reducing valves, saving equipment investment and maintenance costs.
[0029] Although the functions and working processes of the utility model are described above in conjunction with the accompanying drawings, the utility model is not limited to the above-mentioned specific functions and working processes, and the above-mentioned specific implementation methods are merely illustrative rather than restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the utility model and the claims, which are all within the protection of the utility model.
Claims
1. A novel steam energy-saving system, comprising a heat exchange device (1), characterized in that: A flash tank (2) for gas-liquid separation and an adjustable jet pump (4) for increasing steam pressure are connected between the heat exchange medium outlet and the heat exchange medium inlet of the heat exchange device (1) via a pipeline; The material inlet of the flash tank (2) is connected to the heat exchange medium outlet of the heat exchange device (1) through a pipeline, a condensate pump (3) is arranged on the pipeline connected to the liquid outlet at the bottom of the flash tank (2), the steam outlet at the top of the flash tank (2) is connected to the low-pressure steam inlet (401) of the adjustable jet pump (4) through a pipeline, the high-pressure steam inlet (402) of the adjustable jet pump (4) is connected to the steam thermal system through a pipeline, and the steam outlet (403) of the adjustable jet pump (4) is connected to the heat exchange medium inlet of the heat exchange device (1) through a pipeline.
2. The novel steam energy-saving system according to claim 1 is characterized in that: A safety valve (203) and a pressure relief valve (204) are arranged on the top of the flash tank (2), and a liquid level sensor (201) and a No. 1 pressure transmitter (202) are arranged on the flash tank (2), and the liquid level sensor (201) and the No. 1 pressure transmitter (202) are electrically connected to the condensate pump (3) and the pressure relief valve (204) respectively for interlock control.
3. The novel steam energy-saving system according to claim 1 is characterized in that: A second pressure transmitter (5) is provided on the pipeline connecting the steam outlet of the adjustable jet pump (4) and the heat exchange medium inlet of the heat exchange device (1); the second pressure transmitter (5) is electrically connected to the adjustable jet pump (4) for interlock control.