Condensate water recovery system and method based on solvent recovery in leaching workshop

Abstract

The invention discloses a condensate water recovery system and method based on leaching workshop solvent recovery, and relates to the technical field of condensate water recovery, and the condensate water recovery system comprises a leaching workshop, a flat plate dryer, at least two condensate water climbers, a recovery host, a boiler, a high-temperature high-pressure pump and a softened water tank. Through cooperative operation of the condensate water climbing device, the recovery main machine and other equipment, efficient recovery of heat energy in condensate water and dead steam is achieved. On one hand, the high-temperature condensate water is directly injected into the boiler by the high-temperature high-pressure pump at the temperature of more than or equal to 100 DEG C, so that the boiler feed water temperature is increased, and the energy consumption required by the boiler for heating the feed water is reduced; and on the other hand, the dead steam is guided into the softened water tank, the water temperature of the softened water tank is increased from 30 DEG C to 80 DEG C or above, heat energy contained in the dead steam is fully utilized, and the boiler feed water temperature is further increased.

Description

Technical Field

[0001] The present invention relates to the technical field of condensed water recovery, and in particular to a condensed water recovery system and method based on solvent recovery in a leaching workshop. Background Art

[0002] In the production process of oil and fat processing companies, steam is a key energy source, widely used in equipment such as plate dryers and leaching plants. For example, a company currently has a 4-ton natural gas boiler, which supplies steam to the plate dryer and a 50-ton / day leaching plant.

[0003] At present, the leaching workshop adopts an open method to recover condensed water, which has many disadvantages:

[0004] 1) Insufficient thermal energy utilization: During its residence time, condensate mixes with cold water from the boiler's soft water tank, resulting in a boiler feed water temperature of only 30°C. However, the 100°C condensate contains a large amount of thermal energy, which is not fully utilized, resulting in serious energy waste.

[0005] 2) Waste of exhaust steam: The exhaust steam generated in the leaching workshop is all diffused into the air, and this part of heat energy is lost in vain without being effectively recycled.

[0006] 3) Resource Waste: Condensate (or steam consumption) accounts for approximately 35-40% of the flatbed dryer's production. This condensate and exhaust steam are directly lost. At the same time, the same proportion of soft water is also wasted, increasing production costs.

[0007] Currently, no effective solutions have been proposed for the problems in related technologies. Summary of the Invention

[0008] In response to the problems in the related technology, the present invention proposes a condensate recovery system and method based on solvent recovery in a leaching workshop, aiming to provide a condensate recovery system and method based on solvent recovery in a leaching workshop, so as to realize the efficient recycling and utilization of condensate and exhaust steam, improve energy utilization rate, and reduce enterprise production costs.

[0009] The technical solution of the present invention is achieved as follows:

[0010] In one aspect, the present invention:

[0011] A condensate recovery system based on solvent recovery in a leaching workshop comprises: a leaching workshop, a flat plate dryer, at least two condensate climbers, a recovery host, a boiler, a high-temperature and high-pressure pump, and a soft water tank, wherein;

[0012] The two condensate climbers are respectively installed at the condensate collection pipes of the leaching workshop and the flat plate dryer, and are used to automatically lift the condensate and exhaust steam and introduce them into the recovery host.

[0013] The recovery host is installed in the boiler room and is used to separate the imported condensed water and exhaust steam;

[0014] The high-temperature and high-pressure pump is used to directly inject the high-temperature condensed water separated by the recovery host into the boiler;

[0015] The soft water tank is connected to the recovery host through a water feed pump, and the water feed pump mixes the water heated by the exhaust steam in the soft water tank with the condensed water transported by the recovery host and then injects the mixture into the boiler.

[0016] Furthermore, it also includes: a pipe connection component, which is used to install a 304 stainless steel metal hose on the condensate collection pipe of the leaching workshop. The inner layer of the metal hose is a stainless steel corrugated pipe, and the outer layer is a stainless steel braided mesh with a pressure resistance level of 2.5MPa.

[0017] Furthermore, a swing check valve is installed on the condensate climber, the valve seat sealing surface is made of polytetrafluoroethylene material, the nominal diameter is DN50, and the rated working pressure is 1.6MPa.

[0018] Furthermore, the lifting height of the condensate climber under working conditions is 8-10 meters, and the rated flow rate is 15-20 cubic meters per hour.

[0019] Furthermore, the recovery host is equipped with a liquid level control system, a pressure sensor and a temperature sensor.

[0020] Another aspect of the present invention is:

[0021] A condensed water recovery method based on solvent recovery in a leaching workshop, used in the above-mentioned condensed water recovery system based on solvent recovery in a leaching workshop, comprises the following steps:

[0022] After the equipment is started, the condensed water and exhaust steam generated in the leaching workshop and the flat plate dryer automatically enter the recovery host through the condensed water climber under the action of gravity and pressure difference;

[0023] The recovery host separates the steam and water from the incoming mixed medium, and the separated high-temperature condensed water is directly injected into the boiler by a high-temperature and high-pressure pump at the set flow rate and pressure;

[0024] The separated exhaust steam enters the soft water tank, heating the water in the soft water tank, raising the water temperature from 30℃ to above 80℃. The water feed pump mixes the heated water with the condensed water delivered by the recovery host in a preset ratio and then injects it into the boiler.

[0025] The following steps are also included:

[0026] During the operation of the equipment, when an abnormal flow of the condensate climber is detected, the standby climber is automatically started, and the abnormal climber is troubleshooted and repaired.

[0027] Beneficial effects of the present invention:

[0028] 1. This invention achieves efficient heat recovery from condensate and exhaust steam through the coordinated operation of a condensate climber, a recovery unit, and other equipment. High-temperature condensate is directly injected into the boiler at a temperature of ≥100°C via a high-temperature, high-pressure pump, raising the boiler feedwater temperature and reducing the energy required to heat the feedwater. Furthermore, exhaust steam is directed into the soft water tank, raising the water temperature from 30°C to over 80°C. This fully utilizes the heat energy contained in the soft water tank, further increasing the boiler feedwater temperature.

[0029] 2. In terms of energy conservation, the present invention significantly reduces the production cost of the enterprise and improves the economic benefits of the enterprise.

[0030] 3. The present invention improves the stability and safety of boiler operation. After increasing the boiler feed water temperature, no obvious pressure drop is observed during boiler feed water, which makes the temperature and pressure fields inside the boiler more stable, reduces the thermal stress changes caused by too low feed water temperature, and reduces the risk of damage to boiler components, thereby improving the stability and safety of boiler operation, extending the service life of the boiler, and reducing production interruptions and maintenance costs caused by boiler failures.

[0031] 4. The present invention optimizes the production environment, realizes the recovery of condensed water without dead angles in the whole plant, puts an end to the phenomenon of "leakage", eliminates "visual pollution", improves the environmental conditions of the production workshop and its surroundings, provides operators with a cleaner and safer working environment, meets the high standards of modern enterprises for the production environment, and helps to enhance the overall image of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 2 is a schematic diagram of the principle of a condensate recovery system based on solvent recovery in a leaching workshop according to an embodiment of the present invention;

[0034] Figure 2 The present invention is a schematic flow chart of a condensed water recovery method based on solvent recovery in a leaching workshop according to an embodiment of the present invention.

[0035] In the picture:

[0036] 1. Leaching workshop; 2. Flat plate dryer; 3. Condensate climber; 4. Recovery unit; 5. Boiler; 6. High-temperature and high-pressure pump; 7. Soft water tank. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention are within the scope of protection of the present invention.

[0038] According to an embodiment of the present invention, a condensate recovery system based on solvent recovery in a leaching workshop is provided.

[0039] like Figure 1 As shown, the condensate recovery system based on solvent recovery in a leaching workshop according to an embodiment of the present invention includes: a leaching workshop 1, a flat plate dryer 2, at least two condensate climbers 3, a recovery host 4, a boiler 5, a high-temperature and high-pressure pump 6 and a soft water tank 7, wherein the specific installation is as follows:

[0040] Condensate climbers 3 were installed in strict accordance with regulatory requirements at the condensate manifolds of the leaching workshop 1 and flat plate dryer 2. These climbers have excellent lifting capacity, capable of lifting condensate and exhaust steam to a height of 8-10 meters under normal operating conditions, with a rated flow rate of 15-20 cubic meters per hour. They utilize a special internal flow diversion structure consisting of multiple guide plates and spoiler components angled at 30°-45°. They are constructed of 316L stainless steel, which offers excellent corrosion resistance. Swing check valves are also installed, with a polytetrafluoroethylene seat sealing surface, a nominal diameter of DN50, and a rated working pressure of 1.6 MPa. During installation, special attention must be paid to the orientation of the check valves to ensure proper operation and non-interference after grid connection.

[0041] At the same time, a 304 stainless steel metal hose was installed on the condensate collection pipe in leaching workshop 1. Its inner layer is a stainless steel corrugated tube, and its outer layer is a stainless steel braided mesh. It has a pressure rating of 2.5 MPa and adopts a "soft connection" method to adapt to the complex working conditions within the workshop. A φ57*3.5 seamless pipe made of galvanized No. 20 steel with an inner wall roughness of Ra ≤ 1.6 μm was then extended outside the workshop through multiple flanges and welded to complete the connection to the recycling host 4, ensuring a secure and well-sealed pipe connection.

[0042] In addition, the recovery host 4 is installed in a suitable location in the boiler room. The effective volume of the recovery host 4 is 5 cubic meters. It adopts a combination of centrifugal and packing separation technology, and the steam-water separation efficiency is as high as over 98%. Its outer shell is Q345R pressure vessel special steel, and the internal components and pipes are 304 stainless steel. The inner wall is sprayed with a 0.5-1 mm anti-corrosion coating to improve the corrosion resistance and service life of the equipment. The working pressure range is 0.8-1.2MPa, the working temperature range is 80℃-120℃, and it is equipped with a liquid level control system, pressure sensor and temperature sensor for real-time monitoring and control of the equipment operation status. Connect the pipelines with the condensate climber 3, high-temperature and high-pressure pump 6, soft water tank 7, water feed pump and other equipment to ensure that the system is well sealed and leak-free.

[0043] The liquid level control system automatically controls the operation or shutdown of related equipment based on the liquid level within the recovery unit 4 to maintain stable system operation. A pressure sensor monitors the pressure within the recovery unit 4 in real time. When the pressure exceeds the range of 0.8-1.2 MPa, the system issues an alarm and automatically adjusts the operating parameters of related equipment. A temperature sensor monitors the temperature within the recovery unit 4 in real time. When the temperature exceeds the range of 80°C-120°C, the system automatically initiates appropriate cooling or heating measures.

[0044] In addition, a high-temperature, high-pressure pump 6 was installed. Its head was 120-150 meters, and its motor power was 15-20 kW. It uses variable frequency speed regulation to control the pump flow rate by adjusting the motor speed to meet water supply requirements under different operating conditions. The pump utilizes a silicon carbide-graphite mechanical seal and a circulating cooling water cooling system to ensure sealing performance and stable operation in high-temperature, high-pressure environments. The pipes to the recovery unit 4 and boiler 5 were connected securely.

[0045] Specifically, at runtime, the details are as follows:

[0046] After the system is started, the condensate and exhaust steam generated by the leaching workshop 1 and the flat plate dryer 2 automatically enter the recovery unit 4 through the condensate climber 3 under the influence of gravity and pressure differential. The recovery unit 4 separates the steam and water from the incoming mixed medium. The separated high-temperature condensate is directly injected into the boiler 5 by the high-temperature and high-pressure pump 6 at the set flow rate and pressure. The separated exhaust steam enters the soft water tank 7, continuously heating the water in the tank, raising the water temperature from 30°C to above 80°C. The feed water pump mixes the heated water with the condensate delivered by the recovery unit in a specified proportion before injecting it into the boiler 5.

[0047] During the water supply process for boiler 5, the frequency conversion control of the recovery main unit 4 ensures that it handles 80% of the water supply, while the feedwater pump handles 20%, ensuring a stable total water supply to boiler 5. The feedwater ratio is adjusted in real time based on the operating conditions of boiler 5. For example, when the load of boiler 5 changes, the speed of the high-temperature and high-pressure pump 6 and the flow rate of the feedwater pump are adjusted to ensure that the water temperature and water volume of boiler 5 meet the requirements.

[0048] Furthermore, during operation, the system requires regular inspection and maintenance, with a weekly inspection cycle. This inspection includes checking the operating status of equipment such as the condensate climber 3, check valve, high-temperature and high-pressure pump 6, and feed pump for leaks and blockages. Impurities within the pipelines can be cleared through filter drainage or pipe cleaning. The liquid level control system, pressure sensor, and temperature sensor of the recovery unit 4 are checked for proper function to ensure long-term, stable operation of the system. For vulnerable parts, such as check valve seals and mechanical seals, replacement intervals of 6-12 months are estimated, depending on actual usage. Timely replacement is essential to maintain equipment performance.

[0049] In addition, in the application, Company A is a 60t / day oil extraction plant. Before the adoption of this system, the boiler feed water temperature was 32℃, the daily steam consumption was 62t, and the condensate recovery rate was 70%. After the adoption, the feed water temperature rose to above 95℃, the daily steam consumption dropped to 55t, and the recovery rate reached 83%. Based on the calorific value of natural gas 8500 kcal / m 3 , unit price 4.5 yuan / m 3 Calculation shows that 824m3 of natural gas can be saved per day. 3 The cost is 3,708 yuan. The elimination of the 4kw recovery pump saves about 27 yuan in electricity per day, and the flat dryer saves 18 tons of soft water per day at a cost of 54 yuan, with an annual saving of about 1.4 million yuan.

[0050] In addition, Company B, a 50t / day oil extraction plant, encountered unstable flow in the condensate riser during operation. This was resolved after cleaning the pipes and installing a filter. The water temperature in the soft water tank rose slowly in winter, so an electric heater was added to assist with heating. The system ultimately operated stably, with boiler feed water temperatures exceeding 90°C and saving approximately 350m3 of natural gas per day. 3 The cost is 1,575 yuan. The elimination of the 3kw recovery pump saves 20 yuan in electricity per day, and the flat dryer saves 16t of soft water per day, at a cost of 48 yuan, achieving cost reduction, efficiency improvement and sustainable development.

[0051] According to an embodiment of the present invention, a condensed water recovery method based on solvent recovery in a leaching workshop is provided.

[0052] like Figure 2 As shown, the condensed water recovery method based on solvent recovery in a leaching workshop according to an embodiment of the present invention includes the following steps:

[0053] After the equipment is started, the condensed water and exhaust steam generated in the leaching workshop and the flat plate dryer automatically enter the recovery host through the condensed water climber under the action of gravity and pressure difference;

[0054] The recovery host separates the steam and water from the incoming mixed medium, and the separated high-temperature condensed water is directly injected into the boiler by a high-temperature and high-pressure pump at the set flow rate and pressure;

[0055] The separated exhaust steam enters the soft water tank, heating the water in the soft water tank, raising the water temperature from 30℃ to above 80℃. The water feed pump mixes the heated water with the condensed water delivered by the recovery host in a preset ratio and then injects it into the boiler.

[0056] The following steps are also included:

[0057] During the operation of the equipment, when an abnormal flow of the condensate climber is detected, the standby climber is automatically started, and the abnormal climber is troubleshooted and repaired.

[0058] In summary, with the help of the above technical solution of the present invention, the following effects can be achieved:

[0059] 1. The present invention achieves efficient recovery of heat energy from condensate and exhaust steam through the coordinated operation of the condensate climber 3, the recovery unit 4, and other equipment. High-temperature condensate is directly injected into the boiler 5 at a temperature of ≥100°C via the high-temperature, high-pressure pump 6, raising the boiler's feedwater temperature and reducing the energy required to heat the feedwater. Furthermore, the exhaust steam is directed into the soft water tank 7, raising the water temperature from 30°C to over 80°C. This fully utilizes the heat energy contained in the soft water tank, further increasing the boiler's feedwater temperature.

[0060] 2. In terms of energy saving, when natural gas is used as fuel, assuming that the calorific value of natural gas is 8500 kcal / m 3 , unit price 4.5 yuan / m 3 A 55t / day oil extraction plant can save 362m3 of natural gas per day. 3 , saving 1,630 yuan in fuel costs. Furthermore, the existing 3kW or 4kW recovery pumps in Leaching Workshop 1 can be eliminated. For example, using a 3kW recovery pump as an example, this saves 20 yuan in electricity costs per day. Furthermore, the condensate recovery from Flat Dryer 2 saves 15-20 tons of soft water per day. Based on the cost of soft water, this also saves the company money. Overall, this significantly reduces the company's production costs and improves its economic benefits.

[0061] 3. The present invention improves the stability and safety of boiler operation. 3. After the feed water temperature of the boiler 5 is increased, no obvious pressure drop is observed when the boiler 5 is fed with water even in winter. This makes the temperature field and pressure field inside the boiler 5 more stable, reduces the thermal stress changes caused by too low a feed water temperature, and reduces the risk of damage to the components of the boiler 5, thereby improving the stability and safety of the boiler 5 operation, extending the service life of the boiler 5, and reducing production interruptions and maintenance costs caused by boiler 5 failures.

[0062] 4. The present invention optimizes the production environment, realizes the recovery of condensed water without dead angles in the whole plant, puts an end to the phenomenon of "leakage", eliminates "visual pollution", improves the environmental conditions of the production workshop and its surroundings, provides operators with a cleaner and safer working environment, meets the high standards of modern enterprises for the production environment, and helps to enhance the overall image of the enterprise.

[0063] The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the present invention. A person skilled in the art will readily appreciate other embodiments of the present invention after considering the disclosure in the specification and examples. This application is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely exemplary, and the true scope and spirit of the present invention are indicated by the claims.

[0064] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A condensate recovery system based on solvent recovery in a leaching workshop, characterized in that: include: Leaching workshop (1), flat plate dryer (2), at least two condensate climbers (3), recovery host (4), boiler (5), high temperature and high pressure pump (6) and soft water tank (7), wherein; The two condensate climbers (3) are respectively installed at the condensate collection pipes of the leaching workshop (1) and the flat plate dryer (2), and are used to automatically lift the condensate and exhaust steam and introduce them into the recovery host (4). The recovery host (4) is installed in the boiler room and is used to separate the imported condensed water and exhaust steam; The high-temperature and high-pressure pump (6) is used to directly inject the high-temperature condensed water separated by the recovery host (4) into the boiler (5); The soft water tank (7) is connected to the recovery main unit (4) via a water feed pump, and the water feed pump mixes the water heated by the exhaust steam in the soft water tank (7) with the condensed water transported by the recovery main unit (4) and injects the mixture into the boiler (5).

2. The condensate recovery system based on solvent recovery in a leaching workshop according to claim 1, characterized in that: Also includes: The pipe connection assembly is used to install a 304 stainless steel metal hose on the condensate collection pipe of the leaching workshop. The inner layer is a stainless steel bellows and the outer layer is a stainless steel braided mesh with a pressure rating of 2.5MPa.

3. The condensed water recovery system based on solvent recovery in a leaching workshop according to claim 1, characterized in that: The condensate climber (3) is provided with a swing check valve, the valve seat sealing surface of which is made of polytetrafluoroethylene material, with a nominal diameter of DN50 and a rated working pressure of 1.6 MPa.

4. The condensate recovery system based on solvent recovery in a leaching workshop according to claim 3, characterized in that: The lifting height of the condensate climber (3) under working conditions is 8-10 meters, and the rated flow rate is 15-20 cubic meters per hour.

5. The condensate recovery system based on solvent recovery in a leaching workshop according to claim 1, characterized in that: The recovery host (4) is equipped with a liquid level control system, a pressure sensor and a temperature sensor.

6. A condensed water recovery method based on solvent recovery in a leaching workshop, characterized in that: The method for the condensate recovery system based on solvent recovery in a leaching workshop according to any one of claims 1 to 5 comprises the following steps: After the equipment is started, the condensed water and exhaust steam generated in the leaching workshop and the flat plate dryer automatically enter the recovery host through the condensed water climber under the action of gravity and pressure difference; The recovery host separates the steam and water from the incoming mixed medium, and the separated high-temperature condensed water is directly injected into the boiler by a high-temperature and high-pressure pump at the set flow rate and pressure; The separated exhaust steam enters the soft water tank, heating the water in the soft water tank, raising the water temperature from 30℃ to above 80℃. The water feed pump mixes the heated water with the condensed water delivered by the recovery host in a preset ratio and then injects it into the boiler.

7. The condensed water recovery method based on solvent recovery in a leaching workshop according to claim 6, characterized in that: The following steps are also included: During the operation of the equipment, when an abnormal flow of the condensate climber is detected, the standby climber is automatically started, and the abnormal climber is troubleshooted and repaired.

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